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Quick-Text-Buttons

Adds customizable buttons to paste predefined text into the input field on ChatGPT/Gemini.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

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You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

🚀 安装遇到问题?关注公众号获取帮助

公众号二维码

扫码关注【爱吃馍】

回复【脚本】获取最新教程和防失联地址

// ==UserScript==
// @name         Quick-Text-Buttons
// @namespace    https://github.com/p65536
// @version      3.0.0
// @license      MIT
// @description  Adds customizable buttons to paste predefined text into the input field on ChatGPT/Gemini.
// @icon         https://raw.githubusercontent.com/p65536/p65536/main/images/qtb.svg
// @author       p65536
// @match        https://chatgpt.com/*
// @match        https://gemini.google.com/*
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_addValueChangeListener
// @grant        GM_removeValueChangeListener
// @run-at       document-idle
// @noframes
// ==/UserScript==

(() => {
    'use strict';

    // =================================================================================
    // SECTION: Script-Specific Definitions (DO NOT COPY TO OTHER PLATFORM)
    // =================================================================================

    const OWNERID = 'p65536';
    const APPID = 'qtbux';
    const APPNAME = 'Quick Text Buttons';
    const LOG_PREFIX = `[${APPID.toUpperCase()}]`;

    // =================================================================================
    // SECTION: Logging Utility
    // Description: Centralized logging interface for consistent log output across modules.
    //              Handles log level control, message formatting, and console API wrapping.
    // =================================================================================

    class Logger {
        /** @property {object} levels - Defines the numerical hierarchy of log levels. */
        static levels = {
            error: 0,
            warn: 1,
            info: 2,
            log: 3,
            debug: 4,
        };
        /** @property {string} level - The current active log level. */
        static level = 'log'; // Default level

        /**
         * Defines the available badge styles.
         * @property {object} styles
         */
        static styles = {
            BASE: 'color: white; padding: 2px 6px; border-radius: 4px; font-weight: bold;',
            RED: 'background: #dc3545;',
            YELLOW: 'background: #ffc107; color: black;',
            GREEN: 'background: #28a745;',
            BLUE: 'background: #007bff;',
            GRAY: 'background: #6c757d;',
            ORANGE: 'background: #fd7e14;',
            PINK: 'background: #e83e8c;',
            PURPLE: 'background: #6f42c1;',
            CYAN: 'background: #17a2b8; color: black;',
            TEAL: 'background: #20c997; color: black;',
        };

        /**
         * Maps log levels to default badge styles.
         * @private
         */
        static _defaultStyles = {
            error: this.styles.RED,
            warn: this.styles.YELLOW,
            info: this.styles.BLUE,
            log: this.styles.GREEN,
            debug: this.styles.GRAY,
        };

        /**
         * Sets the current log level.
         * @param {string} level The new log level. Must be one of 'error', 'warn', 'info', 'log', 'debug'.
         */
        static setLevel(level) {
            if (Object.prototype.hasOwnProperty.call(this.levels, level)) {
                this.level = level;
            } else {
                // Use default style (empty string) for the badge
                this._out('warn', 'INVALID LEVEL', '', `Invalid log level "${level}". Valid levels are: ${Object.keys(this.levels).join(', ')}. Level not changed.`);
            }
        }

        /**
         * Internal method to output logs if the level permits.
         * @private
         * @param {string} level - The log level ('error', 'warn', 'info', 'log', 'debug').
         * @param {string} badgeText - The text inside the badge. If empty, no badge is shown.
         * @param {string} badgeStyle - The background-color style (from Logger.styles). If empty, uses default.
         * @param {...any} args - The messages to log.
         */
        static _out(level, badgeText, badgeStyle, ...args) {
            if (this.levels[this.level] >= this.levels[level]) {
                const consoleMethod = console[level] || console.log;

                if (badgeText !== '') {
                    // Badge mode: Use %c formatting
                    let style = badgeStyle;
                    if (style === '') {
                        style = this._defaultStyles[level] || this.styles.GRAY;
                    }
                    const combinedStyle = `${this.styles.BASE} ${style}`;

                    consoleMethod(
                        `%c${LOG_PREFIX}%c %c${badgeText}%c`,
                        'font-weight: bold;', // Style for the prefix
                        'color: inherit;', // Reset for space
                        combinedStyle, // Style for the badge
                        'color: inherit;', // Reset for the rest of the message
                        ...args
                    );
                } else {
                    // No badge mode: Direct output for better object inspection
                    consoleMethod(LOG_PREFIX, ...args);
                }
            }
        }

        /**
         * Internal method to start a log group if the level permits (debug or higher).
         * @private
         * @param {'group'|'groupCollapsed'} method - The console method to use.
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args
         */
        static _groupOut(method, badgeText, badgeStyle, ...args) {
            if (this.levels[this.level] >= this.levels.debug) {
                const consoleMethod = console[method];

                if (badgeText !== '') {
                    let style = badgeStyle;
                    if (style === '') {
                        style = this.styles.GRAY;
                    }
                    const combinedStyle = `${this.styles.BASE} ${style}`;

                    consoleMethod(`%c${LOG_PREFIX}%c %c${badgeText}%c`, 'font-weight: bold;', 'color: inherit;', combinedStyle, 'color: inherit;', ...args);
                } else {
                    consoleMethod(LOG_PREFIX, ...args);
                }
            }
        }

        /**
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args
         */
        static error(badgeText, badgeStyle, ...args) {
            this._out('error', badgeText, badgeStyle, ...args);
        }

        /**
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args
         */
        static warn(badgeText, badgeStyle, ...args) {
            this._out('warn', badgeText, badgeStyle, ...args);
        }

        /**
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args
         */
        static info(badgeText, badgeStyle, ...args) {
            this._out('info', badgeText, badgeStyle, ...args);
        }

        /**
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args
         */
        static log(badgeText, badgeStyle, ...args) {
            this._out('log', badgeText, badgeStyle, ...args);
        }

        /**
         * Logs messages for debugging. Only active in 'debug' level.
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args
         */
        static debug(badgeText, badgeStyle, ...args) {
            this._out('debug', badgeText, badgeStyle, ...args);
        }

        /**
         * Starts a timer for performance measurement. Only active in 'debug' level.
         * @param {string} label The label for the timer.
         */
        static time(label) {
            if (this.levels[this.level] >= this.levels.debug) {
                console.time(`${LOG_PREFIX} ${label}`);
            }
        }

        /**
         * Ends a timer and logs the elapsed time. Only active in 'debug' level.
         * @param {string} label The label for the timer, must match the one used in time().
         */
        static timeEnd(label) {
            if (this.levels[this.level] >= this.levels.debug) {
                console.timeEnd(`${LOG_PREFIX} ${label}`);
            }
        }

        /**
         * Starts a log group. Only active in 'debug' level.
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args The title for the log group.
         */
        static group(badgeText, badgeStyle, ...args) {
            this._groupOut('group', badgeText, badgeStyle, ...args);
        }

        /**
         * Starts a collapsed log group. Only active in 'debug' level.
         * @param {string} badgeText
         * @param {string} badgeStyle
         * @param {...any} args The title for the log group.
         */
        static groupCollapsed(badgeText, badgeStyle, ...args) {
            this._groupOut('groupCollapsed', badgeText, badgeStyle, ...args);
        }

        /**
         * Closes the current log group. Only active in 'debug' level.
         * @returns {void}
         */
        static groupEnd() {
            if (this.levels[this.level] >= this.levels.debug) {
                console.groupEnd();
            }
        }
    }

    // Alias for ease of use
    const LOG_STYLES = Logger.styles;

    // =================================================================================
    // SECTION: Execution Guard
    // Description: Prevents the script from being executed multiple times per page.
    // =================================================================================

    class ExecutionGuard {
        // A shared key for all scripts from the same author to avoid polluting the window object.
        static #GUARD_KEY = `__${OWNERID}_guard__`;
        // A specific key for this particular script.
        static #APP_KEY = `${APPID}_executed`;

        /**
         * Checks if the script has already been executed on the page.
         * @returns {boolean} True if the script has run, otherwise false.
         */
        static hasExecuted() {
            return window[this.#GUARD_KEY]?.[this.#APP_KEY] || false;
        }

        /**
         * Sets the flag indicating the script has now been executed.
         */
        static setExecuted() {
            window[this.#GUARD_KEY] = window[this.#GUARD_KEY] || {};
            window[this.#GUARD_KEY][this.#APP_KEY] = true;
        }
    }

    // =================================================================================
    // SECTION: Configuration and Constants
    // Description: Defines default settings, global constants, and CSS selectors.
    // =================================================================================

    const CONSTANTS = {
        CONFIG_KEY: `${APPID}_config`,
        CONFIG_SIZE_RECOMMENDED_LIMIT_BYTES: 5 * 1024 * 1024, // 5MB
        CONFIG_SIZE_LIMIT_BYTES: 10 * 1024 * 1024, // 10MB
        ID_PREFIX: `${APPID}-id-`,
        Z_INDICES: {
            SETTINGS_PANEL: 11000,
            TEXT_LIST: 20001,
        },
        TIMING: {
            TIMEOUTS: {
                POST_NAVIGATION_DOM_SETTLE: 200,
                HIDE_DELAY_MS: 250,
            },
        },
        // Platform-specific path exclusions
        URL_EXCLUSIONS: {
            chatgpt: [/^\/codex/, /^\/gpts/, /^\/apps/],
            gemini: [/^\/gems/],
        },
        PLATFORM: {
            CHATGPT: {
                ID: 'chatgpt',
                HOST: 'chatgpt.com',
            },
            GEMINI: {
                ID: 'gemini',
                HOST: 'gemini.google.com',
            },
        },
        SELECTORS: {
            chatgpt: {
                // Reference element for button positioning (Parent container)
                INSERTION_ANCHOR: 'form[data-type="unified-composer"] div[class*="[grid-area:leading]"]',
                // Actual input element for text insertion
                INPUT_TARGET: 'div.ProseMirror#prompt-textarea',
                // Explicit settings for layout strategy
                ANCHOR_PADDING_LEFT: null, // No padding adjustment needed
                INSERT_METHOD: 'prepend',
            },
            gemini: {
                // Reference element for button positioning - Main text input wrapper (Stable parent)
                INSERTION_ANCHOR: 'input-area-v2 .text-input-field',
                // Actual input element for text insertion
                INPUT_TARGET: 'rich-textarea .ql-editor',
                // Settings for absolute positioning strategy
                // Button occupies 48px (left:8px + width:40px). 52px provides a 4px gap.
                ANCHOR_PADDING_LEFT: '52px',
                INSERT_METHOD: 'append',
            },
        },
        MODAL_TYPES: {
            JSON: 'json',
            TEXT_EDITOR: 'textEditor',
        },
    };

    const EVENTS = {
        CONFIG_SIZE_EXCEEDED: `${APPID}:configSizeExceeded`,
        CONFIG_SAVE_SUCCESS: `${APPID}:configSaveSuccess`,
        REOPEN_MODAL: `${APPID}:reOpenModal`,
        CONFIG_UPDATED: `${APPID}:configUpdated`,
        UI_REPOSITION: `${APPID}:uiReposition`,
        NAVIGATION_START: `${APPID}:navigationStart`,
        NAVIGATION: `${APPID}:navigation`,
    };

    // =================================================================================
    // SECTION: Style System & Definitions
    // Description: Centralizes all CSS generation logic, class name definitions, and DOM injection mechanics.
    // =================================================================================

    /**
     * @class StyleDefinitions
     * @description Manages pure style definitions, class names, and CSS generation logic.
     */
    class StyleDefinitions {
        static ICONS = (() => {
            const COMMON_PROPS = {
                xmlns: 'http://www.w3.org/2000/svg',
                height: '24px',
                viewBox: '0 -960 960 960',
                width: '24px',
                fill: 'currentColor',
            };
            return {
                up: {
                    tag: 'svg',
                    props: { ...COMMON_PROPS },
                    children: [{ tag: 'path', props: { d: 'M480-528 296-344l-56-56 240-240 240 240-56 56-184-184Z' } }],
                },
                down: {
                    tag: 'svg',
                    props: { ...COMMON_PROPS },
                    children: [{ tag: 'path', props: { d: 'M480-344 240-584l56-56 184 184 184-184 56 56-240 240Z' } }],
                },
                delete: {
                    tag: 'svg',
                    props: { ...COMMON_PROPS },
                    children: [{ tag: 'path', props: { d: 'm256-200-56-56 224-224-224-224 56-56 224 224 224-224 56 56-224 224 224 224-56 56-224-224-224 224Z' } }],
                },
                insert: {
                    tag: 'svg',
                    props: { xmlns: 'http://www.w3.org/2000/svg', height: '24px', viewBox: '0 0 24 24', width: '24px', fill: 'currentColor' },
                    children: [
                        { tag: 'path', props: { d: 'M0 0h24v24H0V0z', fill: 'none' } },
                        {
                            tag: 'path',
                            props: {
                                d: 'M14.06 9.02l.92.92L5.92 19H5v-.92l9.06-9.06M17.66 3c-.25 0-.51.1-.7.29l-1.83 1.83 3.75 3.75 1.83-1.83c.39-.39.39-1.02 0-1.41l-2.34-2.34c-.2-.2-.45-.29-.71-.29zm-3.6 3.19L3 17.25V21h3.75L17.81 9.94l-3.75-3.75z',
                            },
                        },
                    ],
                },
                dragHandle: {
                    tag: 'svg',
                    props: { ...COMMON_PROPS },
                    children: [
                        {
                            tag: 'path',
                            props: {
                                d: 'M349.85-524.85q-14.52 0-24.68-10.16-10.17-10.17-10.17-24.69t10.17-24.68q10.16-10.17 24.68-10.17t24.69 10.17q10.16 10.16 10.16 24.68t-10.16 24.69q-10.17 10.16-24.69 10.16Zm260.3,0q-14.52 0-24.68-10.16-10.17-10.17-10.17-24.69t10.17-24.68q10.16-10.17 24.68-10.17t24.69 10.17q10.16 10.16 10.16 24.68t-10.16 24.69q-10.17 10.16-24.69 10.16Zm-260.3-170q-14.52 0-24.68-10.17-10.17-10.16-10.17-24.68t10.17-24.69q10.16-10.16 24.68-10.16t24.69 10.16q10.16 10.17 10.16 24.69t-10.16 24.68q-10.17 10.17-24.69 10.17Zm260.3,0q-14.52 0-24.68-10.17-10.17-10.16-10.17-24.68t10.17-24.69q10.16-10.16 24.68-10.16t24.69 10.16q10.16 10.17 10.16 24.69t-10.16 24.68q-10.17 10.17-24.69 10.17Zm-260.3,340q-14.52 0-24.68-10.17-10.17-10.16-10.17-24.68t10.17-24.69q10.16-10.16 24.68-10.16t24.69 10.16q10.16 10.17 10.16 24.69t-10.16 24.68q-10.17 10.17-24.69 10.17Zm260.3,0q-14.52 0-24.68-10.17-10.17-10.16-10.17-24.68t10.17-24.69q10.16-10.16 24.68-10.16t24.69 10.16q10.16 10.17 10.16 24.69t-10.16 24.68q-10.17 10.17-24.69 10.17Z',
                            },
                        },
                    ],
                },
            };
        })();

        static COMMON_CLASSES = (() => {
            const prefix = `${APPID}-common`;
            return {
                modalButton: `${prefix}-btn`,
                primaryBtn: `${prefix}-btn-primary`,
                pushRightBtn: `${prefix}-btn-push-right`,

                // Form Elements
                formField: `${prefix}-form-field`,
                inputWrapper: `${prefix}-input-wrapper`,
                toggleSwitch: `${prefix}-toggle`,
                toggleSlider: `${prefix}-toggle-slider`,
                selectInput: `${prefix}-select`,

                // Layouts
                submenuRow: `${prefix}-row`,
                submenuFieldset: `${prefix}-fieldset`,
                submenuSeparator: `${prefix}-separator`,
                settingsNote: `${prefix}-note`,

                // Notification
                conflictText: `${prefix}-conflict-text`,
                conflictReloadBtnId: `${prefix}-conflict-reload-btn`,
                warningBanner: `${prefix}-warning-banner`,
            };
        })();

        static MODAL_CLASSES = (() => {
            const prefix = `${APPID}-modal`;
            return {
                dialog: `${prefix}-dialog`,
                box: `${prefix}-box`,
                header: `${prefix}-header`,
                content: `${prefix}-content`,
                footer: `${prefix}-footer`,
                footerMessage: `${prefix}-footer-message`,
                buttonGroup: `${prefix}-button-group`,
            };
        })();

        static SETTINGS_PANEL_CLASSES = (() => {
            const prefix = `${APPID}-settings-panel`;
            return {
                panel: `${prefix}-container`,
                topRow: `${prefix}-top-row`,
            };
        })();

        static VARS = {
            // Backgrounds
            MODAL_BG: `--${APPID}-modal-bg`,
            PANEL_BG: `--${APPID}-panel-bg`,
            INPUT_BG: `--${APPID}-input-bg`,

            // Text Colors
            TEXT_PRIMARY: `--${APPID}-text-primary`,
            TEXT_SECONDARY: `--${APPID}-text-secondary`,
            TEXT_DANGER: `--${APPID}-text-danger`,
            TEXT_WARNING: `--${APPID}-text-warning`,
            TEXT_ACCENT: `--${APPID}-text-accent`,

            // Borders
            BORDER_DEFAULT: `--${APPID}-border-default`,
            BORDER_MEDIUM: `--${APPID}-border-medium`,
            BORDER_LIGHT: `--${APPID}-border-light`,

            // Buttons (Standard)
            BTN_BG: `--${APPID}-btn-bg`,
            BTN_HOVER_BG: `--${APPID}-btn-hover-bg`,
            BTN_TEXT: `--${APPID}-btn-text`,
            BTN_BORDER: `--${APPID}-btn-border`,

            // Toggle Switch
            TOGGLE_BG_OFF: `--${APPID}-toggle-bg-off`,
            TOGGLE_BG_ON: `--${APPID}-toggle-bg-on`,
            TOGGLE_KNOB: `--${APPID}-toggle-knob`,

            // Components specific (Text List & Tabs)
            LIST_BG: `--${APPID}-list-bg`,
            LIST_SHADOW: `--${APPID}-list-shadow`,
            TAB_BG: `--${APPID}-tab-bg`,
            TAB_TEXT: `--${APPID}-tab-text`,
            TAB_BORDER: `--${APPID}-tab-border`,
            TAB_HOVER_BG: `--${APPID}-tab-hover-bg`,
            TAB_ACTIVE_BG: `--${APPID}-tab-active-bg`,
            TAB_ACTIVE_BORDER: `--${APPID}-tab-active-border`,
            TAB_ACTIVE_OUTLINE: `--${APPID}-tab-active-outline`,

            OPTION_BG: `--${APPID}-option-bg`,
            OPTION_TEXT: `--${APPID}-option-text`,
            OPTION_BORDER: `--${APPID}-option-border`,
            OPTION_HOVER_BG: `--${APPID}-option-hover-bg`,
            OPTION_HOVER_BORDER: `--${APPID}-option-hover-border`,
            OPTION_HOVER_OUTLINE: `--${APPID}-option-hover-outline`,

            // Insert Button
            INSERT_BTN_COLOR: `--${APPID}-insert-btn-color`,
            INSERT_BTN_HOVER_BG: `--${APPID}-insert-btn-hover-bg`,
            INSERT_BTN_POSITION: `--${APPID}-insert-btn-position`,
            INSERT_BTN_LEFT: `--${APPID}-insert-btn-left`,
            INSERT_BTN_BOTTOM: `--${APPID}-insert-btn-bottom`,
            INSERT_BTN_SIZE: `--${APPID}-insert-btn-size`,

            // Anchor Layout
            ANCHOR_PADDING_LEFT: `--${APPID}-anchor-padding-left`,
            ANCHOR_GAP: `--${APPID}-anchor-gap`,

            // Theme Modal Specific
            DELETE_BTN_TEXT: `--${APPID}-delete-btn-text`,
            DELETE_BTN_BG: `--${APPID}-delete-btn-bg`,
            DELETE_BTN_HOVER_TEXT: `--${APPID}-delete-btn-hover-text`,
            DELETE_BTN_HOVER_BG: `--${APPID}-delete-btn-hover-bg`,
            DND_INDICATOR: `--${APPID}-dnd-indicator`,
        };

        static PLATFORM_THEMES = {
            chatgpt: {
                [this.VARS.MODAL_BG]: 'var(--main-surface-primary)',
                [this.VARS.PANEL_BG]: 'var(--sidebar-surface-primary)',
                [this.VARS.INPUT_BG]: 'var(--bg-primary)',

                [this.VARS.TEXT_PRIMARY]: 'var(--text-primary)',
                [this.VARS.TEXT_SECONDARY]: 'var(--text-secondary)',
                [this.VARS.TEXT_DANGER]: 'var(--text-danger)',
                [this.VARS.TEXT_WARNING]: '#FFD54F',
                [this.VARS.TEXT_ACCENT]: 'var(--text-accent)',

                [this.VARS.BORDER_DEFAULT]: 'var(--border-default)',
                [this.VARS.BORDER_MEDIUM]: 'var(--border-medium)',
                [this.VARS.BORDER_LIGHT]: 'var(--border-light)',

                [this.VARS.BTN_BG]: 'var(--interactive-bg-tertiary-default)',
                [this.VARS.BTN_HOVER_BG]: 'var(--interactive-bg-secondary-hover)',
                [this.VARS.BTN_TEXT]: 'var(--text-primary)',
                [this.VARS.BTN_BORDER]: 'var(--border-default)',

                [this.VARS.TOGGLE_BG_OFF]: 'var(--bg-primary)',
                [this.VARS.TOGGLE_BG_ON]: 'var(--text-accent)',
                [this.VARS.TOGGLE_KNOB]: 'var(--text-primary)',

                [this.VARS.LIST_BG]: 'var(--main-surface-primary)',
                [this.VARS.LIST_SHADOW]: 'var(--drop-shadow-md, 0 3px 3px #0000001f)',
                [this.VARS.TAB_BG]: 'var(--interactive-bg-tertiary-default)',
                [this.VARS.TAB_TEXT]: 'var(--text-primary)',
                [this.VARS.TAB_BORDER]: 'var(--border-light)',
                [this.VARS.TAB_HOVER_BG]: 'var(--interactive-bg-secondary-hover)',
                [this.VARS.TAB_ACTIVE_BG]: 'var(--interactive-bg-secondary-hover)',
                [this.VARS.TAB_ACTIVE_BORDER]: 'var(--border-default)',
                [this.VARS.TAB_ACTIVE_OUTLINE]: 'var(--border-default)',

                [this.VARS.OPTION_BG]: 'var(--interactive-bg-tertiary-default)',
                [this.VARS.OPTION_TEXT]: 'var(--text-primary)',
                [this.VARS.OPTION_BORDER]: 'var(--border-default)',
                [this.VARS.OPTION_HOVER_BG]: 'var(--interactive-bg-secondary-hover)',
                [this.VARS.OPTION_HOVER_BORDER]: 'var(--border-default)',
                [this.VARS.OPTION_HOVER_OUTLINE]: 'var(--border-default)',

                [this.VARS.INSERT_BTN_COLOR]: 'var(--text-primary)',
                [this.VARS.INSERT_BTN_HOVER_BG]: 'var(--interactive-bg-secondary-hover)',
                [this.VARS.INSERT_BTN_POSITION]: 'static',
                [this.VARS.INSERT_BTN_LEFT]: 'auto',
                [this.VARS.INSERT_BTN_BOTTOM]: 'auto',
                [this.VARS.INSERT_BTN_SIZE]: 'calc(var(--spacing)*9)',

                [this.VARS.ANCHOR_PADDING_LEFT]: '0',
                [this.VARS.ANCHOR_GAP]: '2px',

                [this.VARS.DELETE_BTN_TEXT]: 'var(--interactive-label-danger-secondary-default)',
                [this.VARS.DELETE_BTN_BG]: 'var(--interactive-bg-danger-secondary-default)',
                [this.VARS.DELETE_BTN_HOVER_TEXT]: 'var(--interactive-label-danger-secondary-hover)',
                [this.VARS.DELETE_BTN_HOVER_BG]: 'var(--interactive-bg-secondary-hover)',
                [this.VARS.DND_INDICATOR]: 'var(--text-accent)',
            },
            gemini: {
                [this.VARS.MODAL_BG]: 'var(--gem-sys-color--surface-container-highest)',
                [this.VARS.PANEL_BG]: 'var(--gem-sys-color--surface-container-highest)',
                [this.VARS.INPUT_BG]: 'var(--gem-sys-color--surface-container-low)',

                [this.VARS.TEXT_PRIMARY]: 'var(--gem-sys-color--on-surface)',
                [this.VARS.TEXT_SECONDARY]: 'var(--gem-sys-color--on-surface-variant)',
                [this.VARS.TEXT_DANGER]: 'var(--gem-sys-color--error)',
                [this.VARS.TEXT_WARNING]: '#FFD54F',
                [this.VARS.TEXT_ACCENT]: 'var(--gem-sys-color--primary)',

                [this.VARS.BORDER_DEFAULT]: 'var(--gem-sys-color--outline)',
                [this.VARS.BORDER_MEDIUM]: 'var(--gem-sys-color--outline)',
                [this.VARS.BORDER_LIGHT]: 'var(--gem-sys-color--outline-low)',

                [this.VARS.BTN_BG]: 'var(--gem-sys-color--surface-container-high)',
                [this.VARS.BTN_HOVER_BG]: 'var(--gem-sys-color--surface-container-higher)',
                [this.VARS.BTN_TEXT]: 'var(--gem-sys-color--on-surface-variant)',
                [this.VARS.BTN_BORDER]: 'var(--gem-sys-color--outline)',

                [this.VARS.TOGGLE_BG_OFF]: 'var(--gem-sys-color--surface-container)',
                [this.VARS.TOGGLE_BG_ON]: 'var(--gem-sys-color--primary)',
                [this.VARS.TOGGLE_KNOB]: 'var(--gem-sys-color--on-primary-container)',

                [this.VARS.LIST_BG]: 'var(--gem-sys-color--surface-container-high)',
                [this.VARS.LIST_SHADOW]: '0 4px 12px rgb(0 0 0 / 0.25)',
                [this.VARS.TAB_BG]: 'var(--gem-sys-color--surface-container)',
                [this.VARS.TAB_TEXT]: 'var(--gem-sys-color--on-surface-variant)',
                [this.VARS.TAB_BORDER]: 'var(--gem-sys-color--outline)',
                [this.VARS.TAB_HOVER_BG]: 'var(--gem-sys-color--secondary-container)',
                [this.VARS.TAB_ACTIVE_BG]: 'var(--gem-sys-color--surface-container-higher)',
                [this.VARS.TAB_ACTIVE_BORDER]: 'var(--gem-sys-color--primary)',
                [this.VARS.TAB_ACTIVE_OUTLINE]: 'var(--gem-sys-color--primary)',

                [this.VARS.OPTION_BG]: 'var(--gem-sys-color--surface-container)',
                [this.VARS.OPTION_TEXT]: 'var(--gem-sys-color--on-surface-variant)',
                [this.VARS.OPTION_BORDER]: 'var(--gem-sys-color--outline)',
                [this.VARS.OPTION_HOVER_BG]: 'var(--gem-sys-color--secondary-container)',
                [this.VARS.OPTION_HOVER_BORDER]: 'var(--gem-sys-color--outline)',
                [this.VARS.OPTION_HOVER_OUTLINE]: 'var(--gem-sys-color--primary)',

                [this.VARS.INSERT_BTN_COLOR]: 'var(--mat-icon-button-icon-color, var(--mat-sys-on-surface-variant))',
                [this.VARS.INSERT_BTN_HOVER_BG]: 'color-mix(in srgb, var(--mat-icon-button-state-layer-color) 8%, transparent)',
                [this.VARS.INSERT_BTN_POSITION]: 'absolute',
                [this.VARS.INSERT_BTN_LEFT]: '8px',
                [this.VARS.INSERT_BTN_BOTTOM]: '12px',
                [this.VARS.INSERT_BTN_SIZE]: '40px',

                [this.VARS.ANCHOR_PADDING_LEFT]: '52px',
                [this.VARS.ANCHOR_GAP]: '0',

                [this.VARS.DELETE_BTN_TEXT]: 'var(--gem-sys-color--on-error-container)',
                [this.VARS.DELETE_BTN_BG]: 'var(--gem-sys-color--error-container)',
                [this.VARS.DELETE_BTN_HOVER_TEXT]: 'var(--gem-sys-color--on-error-container)',
                [this.VARS.DELETE_BTN_HOVER_BG]: 'color-mix(in srgb, var(--gem-sys-color--on-error-container) 15%, var(--gem-sys-color--error-container))',
                [this.VARS.DND_INDICATOR]: 'var(--gem-sys-color--primary)',
            },
        };

        static getPlatformVariables(platformId) {
            const theme = this.PLATFORM_THEMES[platformId];
            if (!theme) return '';

            return Object.entries(theme)
                .map(([key, value]) => `${key}: ${value};`)
                .join('\n');
        }

        static getCommon() {
            const key = 'common';
            const cls = StyleDefinitions.COMMON_CLASSES;
            const v = StyleDefinitions.VARS;

            const cssGenerator = (classes) => `
                /* Buttons */
                .${classes.modalButton} {
                    background: var(${v.BTN_BG});
                    border: 1px solid var(${v.BTN_BORDER});
                    border-radius: var(--radius-md, 5px);
                    color: var(${v.BTN_TEXT});
                    cursor: pointer;
                    font-size: 13px;
                    padding: 5px 16px;
                    transition: background 0.12s, color 0.12s, opacity 0.12s;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    white-space: nowrap;
                    min-width: 80px;
                }
                .${classes.modalButton}:hover {
                    background: var(${v.BTN_HOVER_BG}) !important;
                    border-color: var(${v.BTN_BORDER});
                }
                .${classes.modalButton}:disabled {
                    background: var(${v.BTN_BG}) !important;
                    cursor: not-allowed;
                    opacity: 0.5;
                }
                .${classes.primaryBtn} {
                    background-color: #1a73e8 !important;
                    color: #ffffff !important;
                    border: 1px solid transparent !important;
                }
                .${classes.primaryBtn}:hover {
                    background-color: #1557b0 !important;
                }
                .${classes.pushRightBtn} {
                    margin-left: auto !important;
                }

                /* Fieldset & Layout */
                .${classes.submenuFieldset} {
                    border: 1px solid var(${v.BORDER_DEFAULT});
                    border-radius: 4px;
                    padding: 8px 12px 12px;
                    margin: 0 0 12px 0;
                    min-width: 0;
                }
                .${classes.submenuFieldset} legend {
                    padding: 0 4px;
                    font-weight: 500;
                    color: var(${v.TEXT_SECONDARY});
                }
                .${classes.submenuRow} {
                    display: flex;
                    align-items: center;
                    justify-content: space-between;
                    gap: 8px;
                    margin-top: 8px;
                }
                .${classes.submenuRow} label {
                    white-space: nowrap;
                    flex-shrink: 0;
                }
                .${classes.submenuRow} select {
                    width: 50%;
                }
                .${classes.submenuSeparator} {
                    border-top: 1px solid var(${v.BORDER_LIGHT});
                    margin: 12px 0;
                }
                .${classes.settingsNote} {
                    font-size: 0.85em;
                    color: var(${v.TEXT_SECONDARY});
                    text-align: left;
                    margin-top: 8px;
                    padding: 0 4px;
                }

                /* Notification Banner */
                .${classes.warningBanner} {
                    background-color: var(--bg-danger, #ffe6e6);
                    color: var(${v.TEXT_DANGER});
                    padding: 8px 12px;
                    margin-bottom: 12px;
                    border: 1px solid var(--border-danger, #ffcdd2);
                    border-radius: 4px;
                    font-size: 0.9em;
                    line-height: 1.4;
                    white-space: pre-wrap;
                }

                /* Form Inputs */
                .${classes.selectInput} {
                    width: 100%;
                    box-sizing: border-box;
                    background: var(${v.INPUT_BG});
                    border: 1px solid var(${v.BORDER_DEFAULT});
                    color: var(${v.TEXT_PRIMARY});
                    border-radius: 4px;
                    padding: 4px 6px;
                }

                /* Toggle Switch */
                .${classes.toggleSwitch} {
                    position: relative;
                    display: inline-block;
                    width: 40px;
                    height: 22px;
                    flex-shrink: 0;
                }
                .${classes.toggleSwitch} input {
                    opacity: 0;
                    width: 0;
                    height: 0;
                }
                .${classes.toggleSlider} {
                    position: absolute;
                    cursor: pointer;
                    top: 0; left: 0; right: 0; bottom: 0;
                    background-color: var(${v.TOGGLE_BG_OFF});
                    transition: .3s;
                    border-radius: 22px;
                }
                .${classes.toggleSlider}:before {
                    position: absolute;
                    content: "";
                    height: 16px;
                    width: 16px;
                    left: 3px;
                    bottom: 3px;
                    background-color: var(${v.TOGGLE_KNOB});
                    transition: .3s;
                    border-radius: 50%;
                }
                .${classes.toggleSwitch} input:checked + .${classes.toggleSlider} {
                    background-color: var(${v.TOGGLE_BG_ON});
                }
                .${classes.toggleSwitch} input:checked + .${classes.toggleSlider}:before {
                    transform: translateX(18px);
                }
            `;
            return { key, classes: cls, vars: {}, generator: cssGenerator };
        }

        static getModal() {
            const key = 'modal';
            const cls = StyleDefinitions.MODAL_CLASSES;
            const common = StyleDefinitions.COMMON_CLASSES;
            const v = StyleDefinitions.VARS;

            const cssGenerator = (classes) => `
                dialog.${classes.dialog} {
                    padding: 0;
                    border: none;
                    background: transparent;
                    max-width: 100vw;
                    max-height: 100vh;
                    overflow: visible;
                }
                dialog.${classes.dialog}::backdrop {
                    background: rgb(0 0 0 / 0.5);
                    pointer-events: auto;
                }
                .${classes.box} {
                    display: flex;
                    flex-direction: column;
                    background: var(${v.MODAL_BG});
                    color: var(${v.TEXT_PRIMARY});
                    border: 1px solid var(${v.BORDER_DEFAULT});
                    border-radius: 8px;
                    box-shadow: 0 4px 16px rgb(0 0 0 / 0.2);
                }
                .${classes.header}, .${classes.footer} {
                    flex-shrink: 0;
                    padding: 12px 16px;
                }
                .${classes.header} {
                    font-size: 1.1em;
                    font-weight: 600;
                    border-bottom: 1px solid var(${v.BORDER_DEFAULT});
                }
                .${classes.content} {
                    flex-grow: 1;
                    padding: 16px;
                    overflow-y: auto;
                }
                .${classes.footer} {
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                    gap: 16px;
                    border-top: 1px solid var(${v.BORDER_DEFAULT});
                }
                .${classes.footerMessage} {
                    flex-grow: 1;
                    font-size: 0.9em;
                }
                .${classes.buttonGroup} {
                    display: flex;
                    gap: 8px;
                }

                /* Conflict Notification */
                .${classes.footerMessage}.${common.conflictText} {
                    color: var(${v.TEXT_DANGER});
                    display: flex;
                    align-items: center;
                }
                .${classes.footerMessage} #${common.conflictReloadBtnId} {
                    border-color: var(${v.TEXT_DANGER});
                }
            `;
            return { key, classes: cls, vars: {}, generator: cssGenerator };
        }

        static getSettingsPanel() {
            const key = 'settings-panel';
            const cls = StyleDefinitions.SETTINGS_PANEL_CLASSES;
            const common = StyleDefinitions.COMMON_CLASSES;
            const v = StyleDefinitions.VARS;

            const cssGenerator = (classes) => `
                #${classes.panel} {
                    position: fixed;
                    width: min(340px, 95vw);
                    max-height: 85vh;
                    overflow-y: auto;
                    overscroll-behavior: contain;
                    background: var(${v.PANEL_BG});
                    color: var(${v.TEXT_PRIMARY});
                    border-radius: 0.5rem;
                    box-shadow: 0 4px 20px 0 rgb(0 0 0 / 15%);
                    padding: 12px;
                    z-index: ${CONSTANTS.Z_INDICES.SETTINGS_PANEL};
                    border: 1px solid var(${v.BORDER_MEDIUM});
                    font-size: 0.9em;
                }
                .${classes.topRow} {
                    display: flex; gap: 12px;
                }
                .${classes.topRow} .${common.submenuFieldset} {
                    flex: 1 1 0px;
                }
            `;
            return { key, classes: cls, vars: {}, generator: cssGenerator };
        }

        static getTextList() {
            const key = 'text-list';
            const prefix = `${APPID}-text-list`;
            const classes = {
                list: `${prefix}-container`,
                profileBar: `${prefix}-profile-bar`,
                profileName: `${prefix}-profile-name`,
                navBtn: `${prefix}-nav-btn`,
                rotateLeft: `${prefix}-rotate-left`,
                rotateRight: `${prefix}-rotate-right`,
                tabs: `${prefix}-tabs`,
                separator: `${prefix}-separator`,
                tab: `${prefix}-tab`,
                options: `${prefix}-options`,
                option: `${prefix}-option`,
            };
            const v = StyleDefinitions.VARS;

            const cssGenerator = (cls) => `
                #${cls.list} {
                    position: fixed;
                    z-index: ${CONSTANTS.Z_INDICES.TEXT_LIST};
                    display: none;
                    width: min(500px, 95vw);
                    padding: 4px 8px;
                    border-radius: var(--radius-md, 4px);
                    background: var(${v.LIST_BG});
                    color: var(${v.TEXT_PRIMARY});
                    border: 1px solid var(${v.BORDER_MEDIUM});
                    box-shadow: var(${v.LIST_SHADOW});
                    display: flex;
                    flex-direction: column;
                    box-sizing: border-box;
                }
                .${cls.profileBar} {
                    display: flex;
                    align-items: center;
                    justify-content: space-between;
                    margin: 4px 0;
                    padding: 4px 0;
                    border-top: 1px solid var(${v.BORDER_DEFAULT});
                    border-bottom: 1px solid var(${v.BORDER_DEFAULT});
                    flex: 0 0 auto;
                    gap: 8px;
                }
                .${cls.profileName} {
                    flex-grow: 1;
                    text-align: center;
                    font-weight: bold;
                    font-size: 0.95em;
                    overflow: hidden;
                    text-overflow: ellipsis;
                    white-space: nowrap;
                    padding: 0 8px;
                    color: var(${v.TEXT_PRIMARY});
                    cursor: pointer;
                    border-radius: 4px;
                    transition: background 0.2s;
                }
                .${cls.profileName}:hover {
                    background: var(${v.OPTION_HOVER_BG});
                }
                .${cls.navBtn} {
                    background: transparent;
                    border: none;
                    color: var(${v.TEXT_PRIMARY});
                    cursor: pointer;
                    padding: 2px;
                    border-radius: 4px;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    min-width: 24px;
                    height: 24px;
                    opacity: 0.7;
                    transition: opacity 0.2s, background 0.2s;
                }
                .${cls.navBtn}:hover {
                    opacity: 1;
                    background: var(${v.OPTION_HOVER_BG});
                }
                .${cls.rotateLeft} { transform: rotate(-90deg); }
                .${cls.rotateRight} { transform: rotate(90deg); }
                
                .${cls.tabs} {
                    display: flex;
                    margin: 4px 0;
                    flex: 0 0 auto;
                }
                .${cls.separator} {
                    height: 1px;
                    margin: 4px 0;
                    background: var(${v.BORDER_DEFAULT});
                    flex: 0 0 auto;
                }
                .${cls.tab} {
                    flex: 1 1 0;
                    min-width: 0;
                    max-width: 90px;
                    margin-right: 4px;
                    padding: 4px 0;
                    border-radius: var(--radius-md, 4px);
                    font-size: 12px;
                    text-align: center;
                    background: var(${v.TAB_BG});
                    color: var(${v.TAB_TEXT});
                    border: 1px solid var(${v.TAB_BORDER});
                    cursor: pointer;
                    transition: background 0.15s;
                }
                .${cls.tab}.active {
                    background: var(${v.TAB_ACTIVE_BG});
                    border-color: var(${v.TAB_ACTIVE_BORDER});
                    outline: 2px solid var(${v.TAB_ACTIVE_OUTLINE});
                }
                .${cls.tab}:hover {
                    background: var(${v.TAB_HOVER_BG});
                }
                
                .${cls.options} {
                    flex: 1 1 auto;
                    overflow-y: auto;
                    min-height: 0;
                    overscroll-behavior: contain;
                }
                .${cls.option} {
                    display: -webkit-box;
                    -webkit-line-clamp: 3;
                    -webkit-box-orient: vertical;
                    overflow: hidden;
                    width: 100%;
                    margin: 4px 0;
                    padding: 4px;
                    font-size: 13px;
                    text-align: left;
                    border-radius: var(--radius-md, 5px);
                    background: var(${v.OPTION_BG});
                    color: var(${v.OPTION_TEXT});
                    border: 1px solid var(${v.OPTION_BORDER});
                    cursor: pointer;
                }
                .${cls.option}:hover, .${cls.option}:focus {
                    background: var(${v.OPTION_HOVER_BG}) !important;
                    border-color: var(${v.OPTION_HOVER_BORDER}) !important;
                    outline: 2px solid var(${v.OPTION_HOVER_OUTLINE});
                }
                .${cls.option}.active {
                    background: var(${v.TAB_ACTIVE_BG});
                    border-color: var(${v.TAB_ACTIVE_BORDER});
                    font-weight: bold;
                }
            `;
            return { key, classes, vars: {}, generator: cssGenerator };
        }

        static getInsertButton() {
            const key = 'insert-btn';
            const prefix = `${APPID}-insert`;
            const classes = {
                buttonId: `${CONSTANTS.ID_PREFIX}insert-btn`,
                anchorStyled: `${prefix}-anchor-styled`,
            };
            const v = StyleDefinitions.VARS;

            const cssGenerator = (cls) => `
                #${cls.buttonId} {
                    /* Dynamic Layout via Vars */
                    position: var(${v.INSERT_BTN_POSITION}) !important;
                    left: var(${v.INSERT_BTN_LEFT});
                    bottom: var(${v.INSERT_BTN_BOTTOM});
                    width: var(${v.INSERT_BTN_SIZE});
                    height: var(${v.INSERT_BTN_SIZE});
                    margin: 0 !important;
                    
                    /* Visuals */
                    display: flex;
                    background: transparent;
                    border: none;
                    border-radius: 50%;
                    color: var(${v.INSERT_BTN_COLOR});
                    
                    /* Base */
                    font-size: 16px;
                    cursor: pointer;
                    box-shadow: var(--drop-shadow-xs, 0 1px 1px #0000000d);
                    transition: background 0.12s, border-color 0.12s, box-shadow 0.12s;
                    align-items: center;
                    justify-content: center;
                    padding: 0;
                    pointer-events: auto !important;
                }
                #${cls.buttonId}:hover {
                    background: var(${v.INSERT_BTN_HOVER_BG});
                }
                
                /* Anchor Styling */
                .${cls.anchorStyled} {
                    position: relative;
                    display: flex;
                    align-items: center;
                    gap: var(${v.ANCHOR_GAP});
                    padding-left: var(${v.ANCHOR_PADDING_LEFT}) !important;
                }
            `;
            return { key, classes, vars: {}, generator: cssGenerator };
        }

        static getTextEditorModal() {
            const key = 'text-editor';
            const prefix = `${APPID}-text-editor`;
            const classes = {
                // Header Controls
                headerControls: `${prefix}-header-controls`,
                headerRow: `${prefix}-header-row`,
                renameArea: `${prefix}-rename-area`,
                actionArea: `${prefix}-action-area`,
                mainActions: `${prefix}-main-actions`,
                renameActions: `${prefix}-rename-actions`,
                deleteConfirmGroup: `${prefix}-delete-confirm-group`,
                deleteConfirmLabel: `${prefix}-delete-confirm-label`,
                deleteConfirmBtnYes: `${prefix}-delete-confirm-btn-yes`,

                // Content Layout
                modalContent: `${prefix}-modal-content`,
                scrollableArea: `${prefix}-scrollable-area`,

                // Text Item
                textItem: `${prefix}-text-item`,
                dragHandle: `${prefix}-drag-handle`,
                itemControls: `${prefix}-text-item-controls`,

                // Buttons
                moveBtn: `${prefix}-move-btn`,
                deleteBtn: `${prefix}-delete-btn`,
            };
            const v = StyleDefinitions.VARS;
            const common = StyleDefinitions.COMMON_CLASSES;

            const cssGenerator = (cls) => `
                /* Header Layout */
                .${cls.headerControls} {
                  display: flex;
                  flex-direction: column;
                  gap: 12px;
                }
                .${cls.headerRow} {
                  display: grid;
                  /* Label | Flexible Input | Action Buttons */
                  grid-template-columns: 5.5rem 1fr auto;
                  gap: 8px;
                  align-items: center;
                }
                @media (max-width: 800px) {
                    .${cls.headerRow} {
                        grid-template-columns: 1fr;
                        gap: 8px;
                    }
                    .${cls.headerRow} > label {
                        text-align: left;
                    }
                    .${cls.headerRow} > .${cls.renameArea} {
                        grid-column: 1;
                    }
                    .${cls.headerRow} > .${cls.actionArea} {
                        grid-column: 1;
                    }
                }
                .${cls.headerRow}.is-disabled {
                  opacity: 0.5;
                  pointer-events: none;
                }
                .${cls.headerRow} > label {
                  grid-column: 1;
                  text-align: right;
                  color: var(${v.TEXT_SECONDARY});
                  font-size: 0.9em;
                }
                .${cls.headerRow} > .${cls.renameArea} {
                  grid-column: 2;
                  min-width: 180px;
                }
                .${cls.headerRow} > .${cls.actionArea} {
                  grid-column: 3;
                  display: grid;
                  grid-template-columns: 1fr;
                  align-items: center;
                }
                .${cls.actionArea} > * {
                    grid-area: 1 / 1;
                    width: 100%;
                    display: flex;
                    align-items: center;
                }
                .${cls.mainActions},
                .${cls.renameActions} {
                    justify-content: flex-start;
                    gap: 8px;
                    flex-wrap: nowrap;
                }
                .${cls.deleteConfirmGroup} {
                  justify-content: space-between;
                  gap: 8px;
                }
                
                /* Delete Confirmation Styles */
                .${cls.deleteConfirmLabel} {
                  color: var(${v.TEXT_DANGER});
                  font-style: italic;
                  white-space: nowrap;
                }
                .${cls.deleteConfirmBtnYes} {
                  background-color: var(${v.DELETE_BTN_BG}) !important;
                  color: var(${v.DELETE_BTN_TEXT}) !important;
                }
                .${cls.deleteConfirmBtnYes}:hover {
                  background-color: var(${v.DELETE_BTN_HOVER_BG}) !important;
                  color: var(${v.DELETE_BTN_HOVER_TEXT}) !important;
                  filter: brightness(0.85);
                }

                /* Content Layout */
                .${cls.modalContent} {
                  display: flex;
                  flex-direction: column;
                  gap: 12px;
                  height: 60vh;
                  min-height: 200px;
                  overflow: hidden;
                }
                .${cls.scrollableArea} {
                  flex-grow: 1;
                  overflow-y: auto;
                  padding: 4px 8px 4px 4px;
                  display: flex;
                  flex-direction: column;
                  gap: 12px;
                  border: 1px solid var(${v.BORDER_DEFAULT});
                  border-radius: 4px;
                  background: var(${v.INPUT_BG});
                  transition: opacity 0.2s;
                }
                .${cls.scrollableArea}.is-disabled {
                  pointer-events: none;
                  opacity: 0.5;
                }

                /* Text Item (Drag & Drop) */
                .${cls.textItem} {
                  display: flex;
                  align-items: flex-start;
                  gap: 8px;
                  padding: 4px;
                  border-radius: 4px;
                  border-top: 2px solid transparent;
                  border-bottom: 2px solid transparent;
                  transition: background-color 0.2s, border-color 0.1s;
                }
                .${cls.textItem}.dragging {
                  opacity: 0.4;
                  background-color: rgb(255 255 255 / 0.1);
                }
                .${cls.textItem}.drag-over-top {
                  border-top: 2px solid var(${v.DND_INDICATOR});
                }
                .${cls.textItem}.drag-over-bottom {
                  border-bottom: 2px solid var(${v.DND_INDICATOR});
                }
                .${cls.dragHandle} {
                  display: flex;
                  align-items: center;
                  justify-content: center;
                  width: 24px;
                  flex-shrink: 0;
                  align-self: center;
                  cursor: grab;
                  color: var(${v.TEXT_SECONDARY});
                  opacity: 0.6;
                }
                .${cls.dragHandle}:hover {
                  opacity: 1;
                }
                .${cls.dragHandle}:active {
                  cursor: grabbing;
                }
                .${cls.textItem} textarea {
                  flex-grow: 1;
                  resize: none;
                  min-height: 80px;
                  max-height: 250px;
                  overflow-y: auto;
                  font-family: monospace;
                }
                .${cls.textItem}.dragging textarea {
                  pointer-events: none;
                }
                
                /* Item Controls */
                .${cls.itemControls} {
                  display: flex;
                  flex-direction: column;
                  gap: 4px;
                }
                .${common.modalButton}.${cls.moveBtn} {
                  line-height: 1;
                  min-width: 24px;
                  padding: 4px;
                  height: 24px;
                  width: 24px;
                }
                .${common.modalButton}.${cls.deleteBtn} {
                  line-height: 1;
                  min-width: 24px;
                  padding: 4px;
                  height: 24px;
                  width: 24px;
                  font-size: 16px;
                  color: var(${v.TEXT_DANGER});
                }
                
                /* Validation & Common Overrides within this modal */
                .is-invalid {
                  border-color: var(${v.TEXT_DANGER}) !important;
                }

                /* Generic Input Styles for this Modal */
                .${StyleDefinitions.MODAL_CLASSES.box} input,
                .${StyleDefinitions.MODAL_CLASSES.box} select,
                .${StyleDefinitions.MODAL_CLASSES.box} textarea {
                    width: 100%;
                    box-sizing: border-box;
                    background: var(${v.INPUT_BG});
                    color: var(${v.TEXT_PRIMARY});
                    border: 1px solid var(${v.BORDER_DEFAULT});
                    border-radius: 4px;
                    padding: 4px 6px;
                }
            `;
            return { key, classes, vars: {}, generator: cssGenerator };
        }

        static getJsonModal() {
            const key = 'json-modal';
            const prefix = `${APPID}-json`;
            const classes = {
                modalRoot: `${prefix}-root`,
                statusContainer: `${prefix}-status-container`,
                content: `${prefix}-content`,
                editor: `${prefix}-editor`,
                statusRow: `${prefix}-status-row`,
                msg: `${prefix}-modal-msg`,
                sizeInfo: `${prefix}-modal-size-info`,
            };
            const v = StyleDefinitions.VARS;
            const common = StyleDefinitions.COMMON_CLASSES;
            const modalClasses = StyleDefinitions.MODAL_CLASSES;

            const cssGenerator = (cls) => `
                /* Footer Layout Adjustments - Scoped to JSON Modal */
                /* Hide footer message only when it does NOT have the conflict warning class */
                .${cls.modalRoot} .${modalClasses.footerMessage}:not(.${common.conflictText}) {
                    display: none !important;
                }
                
                /* Allow wrapping in footer to prevent overflow when warning message is displayed */
                .${cls.modalRoot} .${modalClasses.footer} {
                    flex-wrap: wrap;
                }

                .${cls.modalRoot} .${modalClasses.buttonGroup} {
                    width: 100%;
                }

                /* Utility classes override for this modal context */
                .${common.modalButton}.${common.pushRightBtn} {
                    margin-left: auto !important;
                }
                .${common.primaryBtn} {
                    background-color: #1a73e8 !important;
                    color: #ffffff !important;
                    border: 1px solid transparent !important;
                }
                .${common.primaryBtn}:hover {
                    background-color: #1557b0 !important;
                }

                .${cls.content} {
                    display: flex;
                    flex-direction: column;
                    gap: 6px;
                    min-width: 0;
                    width: 100%;
                }
                .${cls.modalRoot} .${cls.editor} {
                    width: 100% !important;
                    height: 200px;
                    min-width: 0 !important;
                    max-width: 100%;
                    resize: none;
                    box-sizing: border-box !important;
                    margin: 0 !important;
                    font-family: monospace;
                    font-size: 13px;
                    border: 1px solid var(${v.BORDER_DEFAULT});
                    background: var(${v.INPUT_BG});
                    color: var(${v.TEXT_PRIMARY});
                    padding: 6px;
                    border-radius: 4px;
                }
                .${cls.statusRow} {
                    display: flex;
                    justify-content: space-between;
                    align-items: flex-start;
                    gap: 8px;
                }
                .${cls.msg} {
                    color: var(${v.TEXT_DANGER});
                    font-size: 0.9em;
                    flex: 1;
                    min-height: 1.2em;
                    word-break: break-word;
                }
                .${cls.sizeInfo} {
                    color: var(${v.TEXT_SECONDARY});
                    font-size: 0.85em;
                    white-space: normal;
                    word-break: break-all;
                    text-align: right;
                    margin-top: 2px;
                    flex-shrink: 0;
                }
            `;
            return { key, classes, vars: {}, generator: cssGenerator };
        }

        static getShortcutModal() {
            const key = 'shortcut-modal';
            const prefix = `${APPID}-shortcut`;
            const classes = {
                grid: `${prefix}-grid`,
                keyGroup: `${prefix}-key-group`,
                key: `${prefix}-key`,
                desc: `${prefix}-desc`,
                sectionHeader: `${prefix}-section-header`,
            };
            const v = StyleDefinitions.VARS;

            const cssGenerator = (cls) => `
                .${cls.grid} {
                    display: grid;
                    grid-template-columns: max-content 1fr;
                    gap: 8px 16px;
                    align-items: baseline;
                    padding: 4px;
                }
                .${cls.sectionHeader} {
                    grid-column: 1 / -1;
                    font-weight: bold;
                    color: var(${v.TEXT_SECONDARY});
                    border-bottom: 1px solid var(${v.BORDER_LIGHT});
                    margin-top: 12px;
                    margin-bottom: 4px;
                    padding-bottom: 2px;
                    font-size: 0.9em;
                }
                .${cls.sectionHeader}:first-child {
                    margin-top: 0;
                }
                .${cls.keyGroup} {
                    text-align: right;
                    white-space: nowrap;
                }
                .${cls.key} {
                    display: inline-block;
                    padding: 2px 6px;
                    font-family: monospace;
                    font-size: 0.9em;
                    line-height: 1.2;
                    color: var(${v.TEXT_PRIMARY});
                    background-color: var(${v.BTN_BG});
                    border: 1px solid var(${v.BORDER_DEFAULT});
                    border-radius: 4px;
                    box-shadow: 0 1px 1px rgb(0 0 0 / 0.1);
                    min-width: 1.2em;
                    text-align: center;
                }
                .${cls.desc} {
                    color: var(${v.TEXT_PRIMARY});
                    font-size: 0.95em;
                }
            `;
            return { key, classes, vars: {}, generator: cssGenerator };
        }
    }

    /**
     * @class StyleManager
     * @description Centralizes the creation, injection, and management of CSS style elements.
     */
    class StyleManager {
        static _handles = new Map();

        /**
         * @param {string} id The ID of the style element.
         * @param {string} cssContent The CSS content to inject.
         */
        static _inject(id, cssContent) {
            let style = document.getElementById(id);
            if (!style) {
                const newStyle = document.createElement('style');
                newStyle.id = id;
                style = newStyle;
                const target = document.head || document.documentElement;
                if (target) {
                    target.appendChild(style);
                }
            }
            if (style) {
                style.textContent = cssContent;
            }
        }

        /**
         * Requests a style handle for the given definition provider.
         * @param {() => object} defProvider Function that returns the style definition.
         * @returns {{id: string, prefix: string, classes: object, vars: object}} The style handle.
         */
        static request(defProvider) {
            if (!this._handles.has(defProvider)) {
                const def = defProvider();
                const id = `${APPID}-style-${def.key}`;
                const prefix = `${APPID}-${def.key}`;
                const cssContent = def.generator(def.classes);

                this._inject(id, cssContent);
                this._handles.set(defProvider, { id, prefix, classes: def.classes, vars: def.vars });
            }
            return this._handles.get(defProvider);
        }

        /**
         * Injects platform-specific CSS variables into the root element.
         * @param {string} platformId
         */
        static injectPlatformVariables(platformId) {
            const css = StyleDefinitions.getPlatformVariables(platformId);
            if (css) {
                this._inject(`${APPID}-platform-vars`, `body { ${css} }`);
            }
        }
    }

    // prettier-ignore
    const DEFAULT_CONFIG = {
        options: {
            enable_shortcut: true,
            insert_before_newline: false,
            insert_after_newline: false,
            insertion_position: 'cursor', // 'start', 'cursor', 'end'
            trigger_mode: 'click', // 'click', 'hover'
            activeProfileName: 'Default',
        },
        developer: {
            logger_level: 'log', // 'error', 'warn', 'info', 'log', 'debug'
        },
        texts: [
            {
                name: 'Default',
                categories: [
                    {
                        name: 'Structured',
                        items: [
                            'Explain this step by step.',
                            'Summarize this using bullet points.',
                            'Provide the answer in a table format.'
                        ],
                    },
                    {
                        name: 'Refine',
                        items: [
                            'Can you clarify this point with a concrete example?',
                            'Rephrase this in a more concise and technical manner.',
                            'List the assumptions you are making in this explanation.'
                        ],
                    },
                    {
                        name: 'Coding',
                        items: [
                            'Show a minimal reproducible example.',
                            'Explain this from a performance and maintainability perspective.',
                            'Point out potential edge cases or pitfalls.'
                        ],
                    },
                    {
                        name: 'Twist',
                        items: [
                            'Explain this as if you were teaching a beginner.',
                            'Explain this to an expert in one paragraph.',
                            'Give an alternative perspective or unconventional approach.'
                        ],
                    },
                    {
                        name: 'Image-gen',
                        items: [
                            'Based on all of our previous conversations, generate an image of me as you imagine. Make it super-realistic. Please feel free to fill in any missing information with your own imagination. Do not ask follow-up questions; generate the image immediately.',
                            'Based on all of our previous conversations, generate an image of my ideal partner (opposite sex) as you imagine. Make it super-realistic. Please feel free to fill in any missing information with your own imagination. Do not ask follow-up questions; generate the image immediately.',
                            'Based on all of our previous conversations, generate an image of a person who is the exact opposite of my ideal partner. Make it super-realistic. Please feel free to fill in any missing information with your own imagination. Do not ask follow-up questions; generate the image immediately.',
                        ],
                    },
                ],
            },
        ],
    };

    // =================================================================================
    // SECTION: Platform-Specific Adapter
    // Description: Centralizes all platform-specific logic, such as selectors and
    //              DOM manipulation strategies.
    // =================================================================================

    const PlatformAdapters = {
        General: {
            getPlatformDetails() {
                const { host } = location;
                // ChatGPT
                if (host.includes(CONSTANTS.PLATFORM.CHATGPT.HOST)) {
                    return {
                        platformId: CONSTANTS.PLATFORM.CHATGPT.ID,
                        selectors: CONSTANTS.SELECTORS.chatgpt,
                    };
                }
                // Gemini
                if (host.includes(CONSTANTS.PLATFORM.GEMINI.HOST)) {
                    return {
                        platformId: CONSTANTS.PLATFORM.GEMINI.ID,
                        selectors: CONSTANTS.SELECTORS.gemini,
                    };
                }
                // invalid
                return null;
            },

            /**
             * Checks if the current page URL is on the exclusion list for this platform.
             * @returns {boolean} True if the page should be excluded, otherwise false.
             */
            isExcludedPage() {
                const platform = this.getPlatformDetails();
                if (!platform) return false;

                const exclusions = CONSTANTS.URL_EXCLUSIONS[platform.platformId] || [];
                const pathname = window.location.pathname;

                return exclusions.some((pattern) => pattern.test(pathname));
            },

            /**
             * Finds the editor element and delegates the text insertion task to the EditorController.
             * @param {string} text The text to insert.
             * @param {object} options The insertion options.
             */
            insertText(text, options = {}) {
                const platform = this.getPlatformDetails();
                if (!platform) {
                    Logger.error('PLATFORM', LOG_STYLES.RED, 'Platform details not found.');
                    return;
                }

                // Use INPUT_TARGET for text insertion logic
                const editor = document.querySelector(platform.selectors.INPUT_TARGET);
                if (!editor || !(editor instanceof HTMLElement)) {
                    Logger.error('DOM ERROR', LOG_STYLES.RED, 'Input element not found via selector:', platform.selectors.INPUT_TARGET);
                    return;
                }

                // Delegate the complex insertion logic to the specialized controller.
                EditorController.insertText(text, editor, options, platform.platformId);
            },
        },

        UI: {
            repositionInsertButton(insertButton) {
                if (!insertButton?.element) return;

                withLayoutCycle({
                    measure: () => {
                        // Read phase
                        const platform = PlatformAdapters.General.getPlatformDetails();
                        if (!platform) return { anchor: null };

                        const anchor = document.querySelector(platform.selectors.INSERTION_ANCHOR);
                        if (!(anchor instanceof HTMLElement)) return { anchor: null };

                        // Retrieve configuration for positioning
                        // Configuration now handled via CSS classes, but we verify method logic here
                        const insertMethod = platform.selectors.INSERT_METHOD;

                        if (!insertMethod) {
                            Logger.warn('LAYOUT', LOG_STYLES.YELLOW, 'INSERT_METHOD is not defined for this platform.');
                        }

                        // Ghost Detection Logic
                        const existingBtn = document.getElementById(insertButton.element.id);
                        const isGhost = existingBtn && existingBtn !== insertButton.element;

                        // Check if button is already inside
                        const isInside = !isGhost && anchor.contains(insertButton.element);

                        // Check specific position validity
                        let isAtCorrectPosition = isInside;
                        if (isInside) {
                            if (insertMethod === 'append') {
                                isAtCorrectPosition = anchor.lastElementChild === insertButton.element;
                            } else if (insertMethod === 'prepend') {
                                isAtCorrectPosition = anchor.firstElementChild === insertButton.element;
                            }
                        }

                        return {
                            anchor,
                            isGhost,
                            existingBtn,
                            shouldInject: !isAtCorrectPosition,
                            insertMethod,
                        };
                    },
                    mutate: (measured) => {
                        // Write phase

                        // Guard: Component might be destroyed during async wait
                        if (!insertButton || !insertButton.element) {
                            return;
                        }

                        if (!measured || !measured.anchor) {
                            insertButton.element.style.display = 'none';
                            return;
                        }

                        const { anchor, isGhost, existingBtn, shouldInject, insertMethod } = measured;

                        if (!anchor.isConnected) {
                            Logger.debug('UI RETRY', LOG_STYLES.CYAN, 'Anchor detached. Retrying reposition.');
                            EventBus.publish(EVENTS.UI_REPOSITION);
                            return;
                        }

                        // 1. Ghost Buster
                        if (isGhost && existingBtn) {
                            Logger.warn('GHOST BUSTER', '', 'Detected non-functional ghost button. Removing...');
                            existingBtn.remove();
                        }

                        // 2. Injection
                        if (shouldInject || isGhost) {
                            // Add marker class to apply flex/relative styles defined in CSS
                            // Retrieve class name dynamically from StyleDefinitions
                            const styledClass = StyleDefinitions.getInsertButton().classes.anchorStyled;
                            if (!anchor.classList.contains(styledClass)) {
                                anchor.classList.add(styledClass);
                            }

                            // Insert based on explicit method
                            if (insertMethod === 'append') {
                                anchor.appendChild(insertButton.element);
                            } else if (insertMethod === 'prepend') {
                                anchor.prepend(insertButton.element);
                            }
                            Logger.debug('UI INJECTION', LOG_STYLES.GREEN, `Button injected into Anchor (${insertMethod}).`);
                        }

                        insertButton.element.style.display = '';
                    },
                });
            },
        },

        Observer: {
            /**
             * Returns an array of platform-specific observer initialization functions.
             * @returns {Function[]} An array of functions to be called by ObserverManager.
             */
            // prettier-ignore
            getInitializers() {
                return [
                    this.triggerInitialPlacement,
                ];
            },

            /**
             * @private
             * @description triggers the initial button placement when the anchor element is detected.
             * @returns {() => void} Cleanup function to remove the listener and hide the UI.
             */
            triggerInitialPlacement() {
                const platform = PlatformAdapters.General.getPlatformDetails();
                if (!platform) return () => {};

                const selector = platform.selectors.INSERTION_ANCHOR;

                const handleAnchorAppearance = () => {
                    EventBus.publish(EVENTS.UI_REPOSITION);
                };

                sentinel.on(selector, handleAnchorAppearance);

                // Initial check in case the element is already present
                const initialInputArea = document.querySelector(selector);
                if (initialInputArea instanceof HTMLElement) {
                    handleAnchorAppearance();
                }

                return () => {
                    sentinel.off(selector, handleAnchorAppearance);

                    // Ensure the button is hidden when the observer is cleaned up (e.g., on excluded pages)
                    const btnId = `${CONSTANTS.ID_PREFIX}insert-btn`;
                    const btn = document.getElementById(btnId);
                    if (btn) {
                        btn.style.display = 'none';
                    }
                };
            },
        },
    };

    // =================================================================================
    // SECTION: Editor Controller
    // Description: Handles all direct DOM manipulation and logic for rich text editors.
    // =================================================================================

    class EditorController {
        /**
         * Inserts text for rich text editors (ChatGPT/Gemini) using a full replacement strategy.
         * @param {string} text The text to insert.
         * @param {HTMLElement} editor The target editor element.
         * @param {object} options The insertion options.
         * @param {string} platformId The ID of the current platform ('chatgpt' or 'gemini').
         */
        static insertText(text, editor, options, platformId) {
            const executeInsertion = () => {
                editor.focus();

                const selection = window.getSelection();
                // Check if selection is valid and within the editor
                const hasValidSelection = selection && selection.rangeCount > 0 && editor.contains(selection.anchorNode);
                let range;

                if (hasValidSelection) {
                    range = selection.getRangeAt(0);
                } else {
                    // Fallback: Create a range at the end if invalid
                    range = document.createRange();
                    range.selectNodeContents(editor);
                    range.collapse(false);
                    // Update selection to match this new range so subsequent calls work
                    if (selection) {
                        selection.removeAllRanges();
                        selection.addRange(range);
                    }
                }

                // 1. Get existing text, handling ChatGPT's restored state
                let existingText;
                const paragraphs = Array.from(editor.childNodes).filter((n) => n.nodeName === 'P');
                // A restored state in ChatGPT is characterized by a single <p> containing newlines.
                const isRestoredState = platformId === CONSTANTS.PLATFORM.CHATGPT.ID && paragraphs.length === 1 && paragraphs[0].textContent.includes('\n');

                if (isRestoredState) {
                    // For the restored state, get text content directly from the single paragraph.
                    existingText = paragraphs[0].textContent;
                } else {
                    // For the normal multi-<p> state, use the standard parsing logic.
                    existingText = this._getTextFromEditor(editor, platformId);
                }

                let cursorPos = 0;
                // Determine insertion position based on options and validity of selection
                if (options.insertion_position === 'cursor' && hasValidSelection) {
                    cursorPos = this._getCursorPositionInText(editor, platformId);
                } else if (options.insertion_position === 'start') {
                    cursorPos = 0;
                } else {
                    // 'end' or fallback for invalid selection
                    cursorPos = existingText.length;
                }

                // 2. Prepare the text to be inserted
                let textToInsert = text;
                if (options.insert_before_newline) textToInsert = '\n' + textToInsert;
                if (options.insert_after_newline) textToInsert += '\n';

                // 3. Construct the final, complete text and new cursor position
                const finalText = existingText.slice(0, cursorPos) + textToInsert + existingText.slice(cursorPos);
                const newCursorPos = cursorPos + textToInsert.length;

                // 4. Build a single DOM fragment for the entire new content
                const finalFragment = this._createTextFragmentForEditor(finalText, platformId);

                // 5. Replace editor content safely using Range API
                // We select all contents again to ensure complete replacement
                range.selectNodeContents(editor);
                range.deleteContents();
                range.insertNode(finalFragment);

                // 6. Set the cursor to the end of the inserted text
                this._setCursorPositionByOffset(editor, newCursorPos);

                // 7. Platform-specific cleanup
                if (platformId === CONSTANTS.PLATFORM.GEMINI.ID) {
                    editor.classList.remove('ql-blank');
                }

                // 8. Dispatch events to notify the editor of the change
                editor.dispatchEvent(new Event('input', { bubbles: true, composed: true }));
                editor.dispatchEvent(new Event('change', { bubbles: true, composed: true }));
            };

            // Branch: Focus Check
            if (document.activeElement && editor.contains(document.activeElement)) {
                // Branch A: Already focused -> Execute immediately (Sync)
                executeInsertion();
            } else {
                // Branch B: Not focused -> Focus and wait for next frame (Async)
                editor.focus();
                requestAnimationFrame(() => executeInsertion());
            }
        }

        /**
         * Retrieves the plain text content from the editor (ChatGPT or Gemini).
         * @param {HTMLElement} editor The target editor element.
         * @param {string} platformId The ID of the current platform.
         * @returns {string} The plain text content.
         * @private
         */
        static _getTextFromEditor(editor, platformId) {
            // ChatGPT
            if (platformId === CONSTANTS.PLATFORM.CHATGPT.ID && editor.querySelector('p.placeholder')) {
                return '';
            }
            // Gemini's initial state is <p><br></p>, which should be treated as empty.
            if (platformId === CONSTANTS.PLATFORM.GEMINI.ID && editor.childNodes.length === 1 && editor.firstChild instanceof HTMLElement && editor.firstChild.nodeName === 'P' && editor.firstChild.innerHTML === '<br>') {
                return '';
            }

            const lines = [];

            for (const p of editor.childNodes) {
                if (p.nodeName !== 'P') continue;

                const isStructuralEmptyLine = p.childNodes.length === 1 && p.firstChild && p.firstChild.nodeName === 'BR';
                let isEmptyLine = false;

                if (isStructuralEmptyLine) {
                    if (platformId === CONSTANTS.PLATFORM.CHATGPT.ID) {
                        // For ChatGPT, the class must also match for it to be a true empty line paragraph.
                        if (p.firstChild instanceof HTMLElement) {
                            isEmptyLine = p.firstChild.className === 'ProseMirror-trailingBreak';
                        }
                    } else {
                        // For Gemini, the structure alone is sufficient.
                        isEmptyLine = true;
                    }
                }

                if (isEmptyLine) {
                    lines.push('');
                } else {
                    lines.push(p.textContent);
                }
            }
            return lines.join('\n');
        }

        /**
         * Calculates the cursor's character offset within the plain text representation of the editor.
         * @param {HTMLElement} editor The editor element.
         * @param {string} platformId The ID of the current platform.
         * @returns {number} The character offset of the cursor.
         * @private
         */
        static _getCursorPositionInText(editor, platformId) {
            const selection = window.getSelection();
            if (!selection.rangeCount) return 0;

            const range = selection.getRangeAt(0);
            if (!editor.contains(range.startContainer)) return 0;

            const preCaretRange = range.cloneRange();
            preCaretRange.selectNodeContents(editor);
            preCaretRange.setEnd(range.startContainer, range.startOffset);

            const tempDiv = document.createElement('div');
            tempDiv.appendChild(preCaretRange.cloneContents());

            const textBeforeCursor = this._getTextFromEditor(tempDiv, platformId);
            return textBeforeCursor.length;
        }

        /**
         * Creates a DocumentFragment based on the editor's expected <p> structure.
         * @param {string} text The plain text to convert, with newlines as \n.
         * @param {string} platformId The ID of the current platform.
         * @returns {DocumentFragment} The constructed fragment.
         * @private
         */
        static _createTextFragmentForEditor(text, platformId) {
            const fragment = document.createDocumentFragment();
            const lines = text.split('\n');

            lines.forEach((line) => {
                const p = document.createElement('p');
                if (line === '') {
                    const br = document.createElement('br');
                    if (platformId === CONSTANTS.PLATFORM.CHATGPT.ID) {
                        // ChatGPT
                        br.className = 'ProseMirror-trailingBreak';
                    }
                    p.appendChild(br);
                } else {
                    p.appendChild(document.createTextNode(line));
                }
                fragment.appendChild(p);
            });
            return fragment;
        }

        /**
         * Sets the cursor position within the editor based on a character offset.
         * @param {HTMLElement} editor The editor element.
         * @param {number} offset The target character offset from a plain text representation (with \n).
         * @private
         */
        static _setCursorPositionByOffset(editor, offset) {
            const selection = window.getSelection();
            if (!selection) return;

            const range = document.createRange();
            let charCount = 0;
            /** @type {Node} */
            let lastNode = editor; // Fallback node

            const paragraphs = Array.from(editor.childNodes).filter((n) => n.nodeName === 'P');

            for (let i = 0; i < paragraphs.length; i++) {
                const p = paragraphs[i];
                lastNode = p;
                const treeWalker = document.createTreeWalker(p, NodeFilter.SHOW_TEXT, null);
                let textNode = null;

                while ((textNode = treeWalker.nextNode())) {
                    lastNode = textNode;
                    const nodeLength = textNode.textContent.length;
                    if (charCount + nodeLength >= offset) {
                        range.setStart(textNode, offset - charCount);
                        range.collapse(true);
                        selection.removeAllRanges();
                        selection.addRange(range);
                        return; // Position found and set.
                    }
                    charCount += nodeLength;
                }

                // After processing a paragraph, account for the newline character,
                // but only if it's not the last paragraph.
                if (i < paragraphs.length - 1) {
                    if (charCount === offset) {
                        // This case handles when the cursor position is exactly at the newline.
                        // We place the cursor at the end of the current paragraph.
                        range.selectNodeContents(p);
                        range.collapse(false);
                        selection.removeAllRanges();
                        selection.addRange(range);
                        return;
                    }
                    charCount++; // Increment for the newline
                }
            }

            // If the offset is beyond all text, place cursor at the end of the last node.
            range.selectNodeContents(lastNode);
            range.collapse(false);
            selection.removeAllRanges();
            selection.addRange(range);
        }
    }

    // =================================================================================
    // SECTION: Event-Driven Architecture (Pub/Sub)
    // Description: A event bus for decoupled communication between classes.
    // =================================================================================

    const EventBus = {
        events: {},
        uiWorkQueue: [],
        isUiWorkScheduled: false,
        _logAggregation: {},
        // prettier-ignore
        _aggregatedEvents: new Set([
            EVENTS.UI_REPOSITION,
            EVENTS.NAVIGATION,
        ]),
        _aggregationDelay: 500, // ms

        /**
         * Subscribes a listener to an event using a unique key.
         * If a subscription with the same event and key already exists, it will be overwritten.
         * @param {string} event The event name.
         * @param {Function} listener The callback function.
         * @param {string} key A unique key for this subscription (e.g., 'ClassName.methodName').
         */
        subscribe(event, listener, key) {
            if (!key) {
                Logger.error('', '', 'EventBus.subscribe requires a unique key.');
                return;
            }
            if (!this.events[event]) {
                this.events[event] = new Map();
            }
            this.events[event].set(key, listener);
        },
        /**
         * Subscribes a listener that will be automatically unsubscribed after one execution.
         * @param {string} event The event name.
         * @param {Function} listener The callback function.
         * @param {string} key A unique key for this subscription.
         */
        once(event, listener, key) {
            if (!key) {
                Logger.error('', '', 'EventBus.once requires a unique key.');
                return;
            }
            const onceListener = (...args) => {
                this.unsubscribe(event, key);
                listener(...args);
            };
            this.subscribe(event, onceListener, key);
        },
        /**
         * Unsubscribes a listener from an event using its unique key.
         * @param {string} event The event name.
         * @param {string} key The unique key used during subscription.
         */
        unsubscribe(event, key) {
            if (!this.events[event] || !key) {
                return;
            }
            this.events[event].delete(key);
            if (this.events[event].size === 0) {
                delete this.events[event];
            }
        },
        /**
         * Publishes an event, calling all subscribed listeners with the provided data.
         * @param {string} event The event name.
         * @param {...any} args The data to pass to the listeners.
         */
        publish(event, ...args) {
            if (!this.events[event]) {
                return;
            }

            if (Logger.levels[Logger.level] >= Logger.levels.debug) {
                // --- Aggregation logic START ---
                if (this._aggregatedEvents.has(event)) {
                    if (!this._logAggregation[event]) {
                        this._logAggregation[event] = { timer: null, count: 0 };
                    }
                    const aggregation = this._logAggregation[event];
                    aggregation.count++;

                    clearTimeout(aggregation.timer);
                    aggregation.timer = setTimeout(() => {
                        const finalCount = this._logAggregation[event]?.count || 0;
                        if (finalCount > 0) {
                            Logger.debug('EventBus', LOG_STYLES.PURPLE, `Event Published: ${event} (x${finalCount})`);
                        }
                        delete this._logAggregation[event];
                    }, this._aggregationDelay);

                    // Execute subscribers for the aggregated event, but without the verbose individual logs.
                    [...this.events[event].values()].forEach((listener) => {
                        try {
                            listener(...args);
                        } catch (e) {
                            Logger.error('', '', `EventBus error in listener for event "${event}":`, e);
                        }
                    });
                    return; // End execution here for aggregated events in debug mode.
                }
                // --- Aggregation logic END ---

                // In debug mode, provide detailed logging for NON-aggregated events.
                const subscriberKeys = [...this.events[event].keys()];

                Logger.groupCollapsed('EventBus', LOG_STYLES.PURPLE, `Event Published: ${event}`);

                if (args.length > 0) {
                    console.log('  - Payload:', ...args);
                } else {
                    console.log('  - Payload: (No data)');
                }

                // Displaying subscribers helps in understanding the event's impact.
                if (subscriberKeys.length > 0) {
                    console.log('  - Subscribers:\n' + subscriberKeys.map((key) => `    > ${key}`).join('\n'));
                } else {
                    console.log('  - Subscribers: (None)');
                }

                // Iterate with keys for better logging
                this.events[event].forEach((listener, key) => {
                    try {
                        // Log which specific subscriber is being executed
                        Logger.debug('', LOG_STYLES.PURPLE, `-> Executing: ${key}`);
                        listener(...args);
                    } catch (e) {
                        // Enhance error logging with the specific subscriber key
                        Logger.error('LISTENER ERROR', LOG_STYLES.RED, `Listener "${key}" failed for event "${event}":`, e);
                    }
                });

                Logger.groupEnd();
            } else {
                // Iterate over a copy of the values in case a listener unsubscribes itself.
                [...this.events[event].values()].forEach((listener) => {
                    try {
                        listener(...args);
                    } catch (e) {
                        Logger.error('LISTENER ERROR', LOG_STYLES.RED, `Listener failed for event "${event}":`, e);
                    }
                });
            }
        },

        /**
         * Queues a function to be executed on the next animation frame.
         * Batches multiple UI updates into a single repaint cycle.
         * @param {Function} workFunction The function to execute.
         */
        queueUIWork(workFunction) {
            this.uiWorkQueue.push(workFunction);
            if (!this.isUiWorkScheduled) {
                this.isUiWorkScheduled = true;
                requestAnimationFrame(this._processUIWorkQueue.bind(this));
            }
        },

        /**
         * @private
         * Processes all functions in the UI work queue.
         */
        _processUIWorkQueue() {
            // Prevent modifications to the queue while processing.
            const queueToProcess = [...this.uiWorkQueue];
            this.uiWorkQueue.length = 0;

            for (const work of queueToProcess) {
                try {
                    work();
                } catch (e) {
                    Logger.error('UI QUEUE ERROR', LOG_STYLES.RED, 'Error in queued UI work:', e);
                }
            }
            this.isUiWorkScheduled = false;
        },
    };

    /**
     * Creates a unique, consistent event subscription key for EventBus.
     * @param {object} context The `this` context of the subscribing class instance.
     * @param {string} eventName The full event name from the EVENTS constant.
     * @returns {string} A key in the format 'ClassName.purpose'.
     */
    function createEventKey(context, eventName) {
        // Extract a meaningful 'purpose' from the event name
        const parts = eventName.split(':');
        const purpose = parts.length > 1 ? parts.slice(1).join('_') : parts[0];

        let contextName = 'UnknownContext';
        if (context && context.constructor && context.constructor.name) {
            contextName = context.constructor.name;
        }
        return `${contextName}.${purpose}`;
    }

    // =================================================================================
    // SECTION: Utility Functions
    // =================================================================================

    /**
     * Schedules a function to run when the browser is idle.
     * Returns a cancel function to abort the scheduled task.
     * In environments without `requestIdleCallback`, this runs asynchronously immediately (1ms delay) to prevent blocking,
     * effectively ignoring the `timeout` constraint by satisfying it instantly.
     * @param {(deadline: IdleDeadline) => void} callback The function to execute.
     * @param {number} timeout The maximum time to wait for idle before forcing execution.
     * @returns {() => void} A function to cancel the scheduled task.
     */
    function runWhenIdle(callback, timeout) {
        if ('requestIdleCallback' in window) {
            const id = window.requestIdleCallback(callback, { timeout });
            return () => window.cancelIdleCallback(id);
        } else {
            // Fallback: Execute almost immediately (1ms) to avoid blocking.
            // This satisfies the "run by timeout" contract trivially since 1ms < timeout.
            const id = setTimeout(() => {
                // Provide a minimal IdleDeadline-like object.
                // timeRemaining() returns 50ms to simulate a fresh frame.
                callback({
                    didTimeout: false,
                    timeRemaining: () => 50,
                });
            }, 1);

            return () => clearTimeout(id);
        }
    }

    /**
     * @param {Function} func
     * @param {number} delay
     * @param {boolean} useIdle
     * @returns {((...args: any[]) => void) & { cancel: () => void }}
     */
    function debounce(func, delay, useIdle) {
        let timerId = null;
        let cancelIdle = null;

        const cancel = () => {
            if (timerId !== null) {
                clearTimeout(timerId);
                timerId = null;
            }
            if (cancelIdle) {
                cancelIdle();
                cancelIdle = null;
            }
        };

        const debounced = function (...args) {
            cancel();
            timerId = setTimeout(() => {
                timerId = null; // Timer finished
                if (useIdle) {
                    // Calculate idle timeout based on delay: clamp(delay * 4, 200, 2000)
                    // This ensures short delays don't wait too long, while long delays are capped.
                    const idleTimeout = Math.min(Math.max(delay * 4, 200), 2000);

                    // Schedule idle callback and store the cancel function
                    // Explicitly receive 'deadline' to match runWhenIdle signature
                    cancelIdle = runWhenIdle((deadline) => {
                        cancelIdle = null; // Idle callback finished
                        func.apply(this, args);
                    }, idleTimeout);
                } else {
                    func.apply(this, args);
                }
            }, delay);
        };

        debounced.cancel = cancel;
        return debounced;
    }

    /**
     * Helper function to check if an item is a non-array object.
     * @param {unknown} item The item to check.
     * @returns {item is Record<string, any>}
     */
    function isObject(item) {
        return !!(item && typeof item === 'object' && !Array.isArray(item));
    }

    /**
     * Creates a deep copy of a JSON-serializable object.
     * @template T
     * @param {T} obj The object to clone.
     * @returns {T} The deep copy of the object.
     */
    function deepClone(obj) {
        try {
            return structuredClone(obj);
        } catch (e) {
            Logger.error('CLONE FAILED', '', 'deepClone failed. Data contains non-clonable items.', e);
            throw e;
        }
    }

    /**
     * Recursively resolves the configuration by overlaying source properties onto the target object.
     * The target object is mutated. This handles recursive updates for nested objects but overwrites arrays/primitives.
     *
     * [MERGE BEHAVIOR]
     * Keys present in 'source' but missing in 'target' are ignored.
     * The 'target' object acts as a schema; it must contain all valid keys.
     *
     * @param {object} target The target object (e.g., a deep copy of default config).
     * @param {object} source The source object (e.g., user config).
     * @returns {object} The mutated target object.
     */
    function resolveConfig(target, source) {
        for (const key in source) {
            // Security: Prevent prototype pollution
            if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
                continue;
            }

            if (Object.prototype.hasOwnProperty.call(source, key)) {
                // Strict check: Ignore keys that do not exist in the target (default config).
                if (!Object.prototype.hasOwnProperty.call(target, key)) {
                    continue;
                }

                const sourceVal = source[key];
                const targetVal = target[key];

                if (isObject(sourceVal) && isObject(targetVal)) {
                    // If both are objects, recurse
                    resolveConfig(targetVal, sourceVal);
                } else if (typeof sourceVal !== 'undefined') {
                    // Otherwise, overwrite or set the value from the source
                    target[key] = sourceVal;
                }
            }
        }
        return target;
    }

    /**
     * Proposes a unique name by appending a suffix if the base name already exists in a given set.
     * Supports both an array of strings and an array of objects with a 'name' property.
     * @param {string} baseName The initial name to check.
     * @param {Set<string>|Array<string>|Array<object>} existingItems Collection of existing names or objects.
     * @returns {string} A unique name.
     */
    function proposeUniqueName(baseName, existingItems) {
        const lowerNames = new Set();
        const items = Array.isArray(existingItems) ? existingItems : Array.from(existingItems);

        // Normalize input to a set of lowercase strings
        items.forEach((item) => {
            if (typeof item === 'string') {
                lowerNames.add(item.toLowerCase());
            } else if (item && typeof item === 'object' && typeof item.name === 'string') {
                lowerNames.add(item.name.toLowerCase());
            }
        });

        if (!lowerNames.has(baseName.trim().toLowerCase())) {
            return baseName;
        }

        let proposedName = `${baseName} Copy`;
        if (!lowerNames.has(proposedName.trim().toLowerCase())) {
            return proposedName;
        }

        let counter = 2;
        while (true) {
            proposedName = `${baseName} Copy ${counter}`;
            if (!lowerNames.has(proposedName.trim().toLowerCase())) {
                return proposedName;
            }
            counter++;
        }
    }

    /**
     * @description A utility to prevent layout thrashing by separating DOM reads (measure)
     * from DOM writes (mutate). The mutate function is executed in the next animation frame.
     * @param {{
     * measure: () => T,
     * mutate: (data: T) => void
     * }} param0 - An object containing the measure and mutate functions.
     * @returns {Promise<void>} A promise that resolves after the mutate function has completed.
     * @template T
     */
    function withLayoutCycle({ measure, mutate }) {
        return new Promise((resolve, reject) => {
            let measuredData;

            // Phase 1: Synchronously read all required layout properties from the DOM.
            try {
                measuredData = measure();
            } catch (e) {
                Logger.error('LAYOUT ERROR', LOG_STYLES.RED, 'Error during measure phase:', e);
                reject(e);
                return;
            }

            // Phase 2: Schedule the DOM mutations to run in the next animation frame.
            requestAnimationFrame(() => {
                try {
                    mutate(measuredData);
                    resolve();
                } catch (e) {
                    Logger.error('LAYOUT ERROR', LOG_STYLES.RED, 'Error during mutate phase:', e);
                    reject(e);
                }
            });
        });
    }

    /**
     * @typedef {Node|string|number|boolean|null|undefined} HChild
     */
    /**
     * Creates a DOM element using a hyperscript-style syntax.
     * @param {string} tag - Tag name with optional ID/class (e.g., "div#app.container", "my-element").
     * @param {object | HChild | HChild[]} [propsOrChildren] - Attributes object or children.
     * @param {HChild | HChild[]} [children] - Children (if props are specified).
     * @returns {HTMLElement | SVGElement} The created DOM element.
     */
    function h(tag, propsOrChildren, children) {
        const SVG_NS = 'http://www.w3.org/2000/svg';
        const match = tag.match(/^([a-z0-9-]+)(#[\w-]+)?((\.[\w-]+)*)$/i);
        if (!match) throw new Error(`Invalid tag syntax: ${tag}`);

        const [, tagName, id, classList] = match;
        const isSVG = ['svg', 'circle', 'rect', 'path', 'g', 'line', 'text', 'use', 'defs', 'clipPath'].includes(tagName);
        const el = isSVG ? document.createElementNS(SVG_NS, tagName) : document.createElement(tagName);

        if (id) el.id = id.slice(1);
        if (classList) {
            const classes = classList.replace(/\./g, ' ').trim();
            if (classes) {
                el.classList.add(...classes.split(/\s+/));
            }
        }

        let props = {};
        let childrenArray;
        if (propsOrChildren && Object.prototype.toString.call(propsOrChildren) === '[object Object]') {
            props = propsOrChildren;
            childrenArray = children;
        } else {
            childrenArray = propsOrChildren;
        }

        // --- Start of Attribute/Property Handling ---
        const directProperties = new Set(['value', 'checked', 'selected', 'readOnly', 'disabled', 'multiple', 'textContent']);
        const urlAttributes = new Set(['href', 'src', 'action', 'formaction']);
        const safeProtocols = new Set(['https:', 'http:', 'mailto:', 'tel:', 'blob:', 'data:']);

        for (const [key, value] of Object.entries(props)) {
            // 0. Handle `ref` callback (highest priority after props parsing).
            if (key === 'ref' && typeof value === 'function') {
                value(el);
            }
            // 1. Security check for URL attributes.
            else if (urlAttributes.has(key)) {
                const url = String(value);
                try {
                    const parsedUrl = new URL(url); // Throws if not an absolute URL.
                    if (safeProtocols.has(parsedUrl.protocol)) {
                        el.setAttribute(key, url);
                    } else {
                        el.setAttribute(key, '#');
                        Logger.warn('UNSAFE URL', LOG_STYLES.YELLOW, `Blocked potentially unsafe protocol "${parsedUrl.protocol}" in attribute "${key}":`, url);
                    }
                } catch {
                    el.setAttribute(key, '#');
                    Logger.warn('INVALID URL', LOG_STYLES.YELLOW, `Blocked invalid or relative URL in attribute "${key}":`, url);
                }
            }
            // 2. Direct property assignments.
            else if (directProperties.has(key)) {
                el[key] = value;
            }
            // 3. Other specialized handlers.
            else if (key === 'style' && typeof value === 'object') {
                Object.assign(el.style, value);
            } else if (key === 'dataset' && typeof value === 'object') {
                for (const [dataKey, dataVal] of Object.entries(value)) {
                    el.dataset[dataKey] = dataVal;
                }
            } else if (key.startsWith('on')) {
                if (typeof value === 'function') {
                    el.addEventListener(key.slice(2).toLowerCase(), value);
                }
            } else if (key === 'className') {
                const classes = String(value).trim();
                if (classes) {
                    el.classList.add(...classes.split(/\s+/));
                }
            } else if (key.startsWith('aria-')) {
                el.setAttribute(key, String(value));
            }
            // 4. Default attribute handling.
            else if (value !== false && value !== null && typeof value !== 'undefined') {
                el.setAttribute(key, value === true ? '' : String(value));
            }
        }
        // --- End of Attribute/Property Handling ---

        const fragment = document.createDocumentFragment();
        /**
         * Appends a child node or text to the document fragment.
         * @param {HChild} child - The child to append.
         */
        function append(child) {
            if (child === null || child === false || typeof child === 'undefined') return;
            if (typeof child === 'string' || typeof child === 'number') {
                fragment.appendChild(document.createTextNode(String(child)));
            } else if (Array.isArray(child)) {
                child.forEach(append);
            } else if (child instanceof Node) {
                fragment.appendChild(child);
            } else {
                throw new Error('Unsupported child type');
            }
        }
        append(childrenArray);

        el.appendChild(fragment);

        if (el instanceof HTMLElement || el instanceof SVGElement) {
            return el;
        }
        throw new Error('Created element is not a valid HTMLElement or SVGElement');
    }

    /**
     * Recursively builds a DOM element from a definition object using the h() function.
     * @param {object} def The definition object for the element.
     * @returns {HTMLElement | SVGElement | null} The created DOM element.
     */
    function createIconFromDef(def) {
        if (!def) return null;
        const children = def.children ? def.children.map((child) => createIconFromDef(child)) : [];
        return h(def.tag, def.props, children);
    }

    /**
     * A helper function to safely retrieve a nested property from an object using a dot-notation string.
     * @param {object} obj The object to query.
     * @param {string} path The dot-separated path to the property.
     * @returns {any} The value of the property, or undefined if not found.
     */
    function getPropertyByPath(obj, path) {
        if (!obj || typeof path !== 'string') {
            return undefined;
        }
        return path.split('.').reduce((o, k) => (o === undefined || o === null ? undefined : o[k]), obj);
    }

    /**
     * Sets a nested property on an object using a dot-notation path.
     * @param {object} obj The object to modify.
     * @param {string} path The dot-separated path to the property.
     * @param {any} value The value to set.
     * @returns {boolean} True if successful, false if the path was invalid or blocked.
     */
    function setPropertyByPath(obj, path, value) {
        if (!obj || typeof obj !== 'object') {
            Logger.warn('OBJ GUARD', LOG_STYLES.YELLOW, `setPropertyByPath: Target object is invalid (type: ${typeof obj}).`);
            return false;
        }
        if (!path) return false;
        const keys = path.split('.');
        let current = obj;

        for (let i = 0; i < keys.length - 1; i++) {
            const key = keys[i];

            if (!key) {
                Logger.warn('OBJ GUARD', LOG_STYLES.YELLOW, `setPropertyByPath: Invalid empty key in path "${path}".`);
                return false;
            }

            // Security: Prevent prototype pollution
            if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
                Logger.warn('OBJ GUARD', LOG_STYLES.YELLOW, `setPropertyByPath: Blocked forbidden key "${key}" in path "${path}".`);
                return false;
            }

            // If the property exists, validate that it is an object (and not null) to allow nesting.
            if (current[key] !== undefined && current[key] !== null) {
                if (typeof current[key] !== 'object') {
                    Logger.warn('OBJ GUARD', LOG_STYLES.YELLOW, `setPropertyByPath: Cannot set property "${keys[i + 1]}" on non-object value at "${keys.slice(0, i + 1).join('.')}" in path "${path}".`);
                    return false;
                }
            } else {
                // Only create a new object if the property is null or undefined.
                // This prevents overwriting existing values (like arrays) with empty objects.
                current[key] = {};
            }

            current = current[key];
        }

        const lastKey = keys[keys.length - 1];

        if (!lastKey) {
            Logger.warn('OBJ GUARD', LOG_STYLES.YELLOW, `setPropertyByPath: Invalid empty key at end of path "${path}".`);
            return false;
        }

        // Security: Prevent prototype pollution on the last key
        if (lastKey === '__proto__' || lastKey === 'constructor' || lastKey === 'prototype') {
            Logger.warn('OBJ GUARD', LOG_STYLES.YELLOW, `setPropertyByPath: Blocked forbidden key "${lastKey}" in path "${path}".`);
            return false;
        }

        current[lastKey] = value;
        return true;
    }

    // =================================================================================
    // SECTION: Base Manager
    // Description: Provides common lifecycle and event subscription management.
    // =================================================================================

    /**
     * @class BaseManager
     * @description Provides common lifecycle and event subscription management capabilities.
     * Implements the Template Method pattern for init/destroy cycles.
     */
    class BaseManager {
        constructor() {
            /** @type {Array<{event: string, key: string}>} */
            this.subscriptions = [];
            this.isInitialized = false;
            this.isDestroyed = false;
            /** @type {Promise<void>|null} */
            this._initPromise = null;
        }

        /**
         * Initializes the manager.
         * Prevents double initialization and supports async hooks.
         * @param {...any} args Arguments to pass to the hook method.
         * @returns {Promise<void>}
         */
        async init(...args) {
            if (this.isInitialized) return;

            // Guard against concurrent initialization
            if (this._initPromise) {
                await this._initPromise;
                return;
            }

            this.isDestroyed = false;

            this._initPromise = (async () => {
                await this._onInit(...args);
                // Check if destroyed during async init
                if (!this.isDestroyed) {
                    this.isInitialized = true;
                }
            })();

            try {
                await this._initPromise;
            } finally {
                this._initPromise = null;
            }
        }

        /**
         * Destroys the manager and cleans up resources.
         * Idempotent: safe to call multiple times.
         */
        destroy() {
            if (this.isDestroyed) return;
            this.isDestroyed = true;
            this.isInitialized = false;

            // 1. Hook for subclass specific cleanup
            this._onDestroy();

            // 2. Unsubscribe from all events
            // Create a snapshot to safely iterate even if unsubscribing modifies the original array
            const subsToUnsubscribe = [...this.subscriptions];
            // Immediately clear the array to prevent re-entry or access during cleanup
            this.subscriptions = [];

            // Iterate in reverse order (LIFO) to respect dependencies
            for (let i = subsToUnsubscribe.length - 1; i >= 0; i--) {
                const { event, key } = subsToUnsubscribe[i];
                EventBus.unsubscribe(event, key);
            }
        }

        /**
         * Registers a platform-specific listener.
         * Exposes subscription capability to adapters safely.
         * @param {string} event
         * @param {Function} callback
         */
        registerPlatformListener(event, callback) {
            this._subscribe(event, callback);
        }

        /**
         * Registers a one-time platform-specific listener.
         * Exposes single subscription capability to adapters safely.
         * @param {string} event
         * @param {Function} callback
         */
        registerPlatformListenerOnce(event, callback) {
            this._subscribeOnce(event, callback);
        }

        /**
         * Hook method for initialization logic.
         * @protected
         * @param {...any} args
         */
        _onInit(...args) {
            // To be implemented by subclasses
        }

        /**
         * Hook method for cleanup logic.
         * @protected
         */
        _onDestroy() {
            // To be implemented by subclasses
        }

        /**
         * Helper to subscribe to EventBus and track the subscription for cleanup.
         * Appends the listener name and a unique suffix to the key to avoid conflicts.
         * @protected
         * @param {string} event
         * @param {Function} listener
         */
        _subscribe(event, listener) {
            const baseKey = createEventKey(this, event);
            // Use function name for debugging aid, fallback to 'anonymous'
            const listenerName = listener.name || 'anonymous';
            // Generate a short random suffix to guarantee uniqueness even for anonymous functions
            const uniqueSuffix = Math.random().toString(36).substring(2, 7);
            const key = `${baseKey}_${listenerName}_${uniqueSuffix}`;

            EventBus.subscribe(event, listener, key);
            this.subscriptions.push({ event, key });
        }

        /**
         * Helper to subscribe to EventBus once and track the subscription for cleanup.
         * Appends the listener name and a unique suffix to the key to avoid conflicts.
         * @protected
         * @param {string} event
         * @param {Function} listener
         */
        _subscribeOnce(event, listener) {
            const baseKey = createEventKey(this, event);
            // Use function name for debugging aid, fallback to 'anonymous'
            const listenerName = listener.name || 'anonymous';
            // Generate a short random suffix to guarantee uniqueness even for anonymous functions
            const uniqueSuffix = Math.random().toString(36).substring(2, 7);
            const key = `${baseKey}_${listenerName}_${uniqueSuffix}`;

            // Wrapper to cleanup the subscription record after firing
            const wrappedListener = (...args) => {
                this._removeSubscriptionRecord(key);
                listener(...args);
            };

            EventBus.once(event, wrappedListener, key);
            this.subscriptions.push({ event, key });
        }

        /**
         * Helper to unsubscribe from specific events dynamically.
         * @protected
         * @param {string} event The event name.
         * @param {string} [keyPrefix] Optional prefix to filter specific listeners (e.g. 'ClassName.purpose').
         */
        _unsubscribe(event, keyPrefix) {
            const fullKeyPrefix = keyPrefix || createEventKey(this, event);

            // Find matching subscriptions
            const toRemove = this.subscriptions.filter((sub) => sub.event === event && sub.key.startsWith(fullKeyPrefix));

            // Unsubscribe and remove from list
            toRemove.forEach((sub) => {
                EventBus.unsubscribe(sub.event, sub.key);
                this._removeSubscriptionRecord(sub.key);
            });
        }

        /**
         * Internal helper to remove a subscription record from the array by key.
         * @private
         * @param {string} key
         */
        _removeSubscriptionRecord(key) {
            this.subscriptions = this.subscriptions.filter((sub) => sub.key !== key);
        }
    }

    // =================================================================================
    // SECTION: UI Construction System (ReactiveStore / FormEngine / SchemaBuilder)
    // =================================================================================

    /**
     * @abstract
     * @class UIComponentBase
     * @extends BaseManager
     * @description Base class for a UI component with lifecycle management.
     */
    class UIComponentBase extends BaseManager {
        constructor(callbacks = {}) {
            super();
            this.callbacks = callbacks;
            this.element = null;
            this.storeSubscriptions = [];
        }

        /**
         * @abstract
         * Renders the component's DOM structure. Must be implemented by subclasses.
         * @returns {HTMLElement|void}
         */
        render() {
            throw new Error('Component must implement render method.');
        }

        /**
         * Adds a store subscription handle (unsubscribe function) to be managed by the component.
         * @param {() => void} unsub - The unsubscribe function returned by store.subscribe.
         */
        addStoreSubscription(unsub) {
            if (typeof unsub === 'function') {
                this.storeSubscriptions.push(unsub);
            }
        }

        /**
         * Executes all registered store subscription handles and clears the list.
         * Can be called manually (e.g. on modal close) or automatically on destroy.
         */
        clearStoreSubscriptions() {
            this.storeSubscriptions.forEach((unsub) => unsub());
            this.storeSubscriptions = [];
        }

        /**
         * Lifecycle hook for cleanup.
         * Removes the component's element from the DOM.
         * @protected
         * @override
         */
        _onDestroy() {
            this.clearStoreSubscriptions();
            this.element?.remove();
            this.element = null;
        }
    }

    /**
     * @class ReactiveStore
     * @description A simple reactive store implementing the Pub/Sub pattern.
     * It allows setting and getting values using dot-notation paths and notifies listeners on changes.
     *
     * [NOTIFICATION BEHAVIOR]
     * - Notifications are triggered strictly for the exact path being modified.
     * - Changes do NOT bubble up to parent paths.
     * - Subscribers are responsible for determining if a change affects them (e.g., using startsWith checks).
     */
    class ReactiveStore {
        constructor(initialState) {
            this.state = deepClone(initialState);
            this.listeners = new Set();
        }

        /**
         * Retrieves a value from the store by path.
         * @param {string} path - The dot-notation path to the property.
         * @returns {any} The value at the specified path.
         */
        get(path) {
            return getPropertyByPath(this.state, path);
        }

        /**
         * Sets a value in the store at the specified path.
         * Notifies listeners if the value has effectively changed.
         * @param {string} path - The dot-notation path to the property.
         * @param {any} value - The new value to set.
         */
        set(path, value) {
            // Validate path to prevent errors in split logic or setPropertyByPath
            if (!path || typeof path !== 'string') {
                Logger.warn('Store', '', `ReactiveStore.set: Invalid path "${path}"`);
                return;
            }

            const currentValue = this.get(path);
            // Use Object.is for strict equality check (handles NaN, -0/+0 correctly)
            if (Object.is(currentValue, value)) return;

            // Only notify if the update was successful
            if (setPropertyByPath(this.state, path, value)) {
                // Notify only the specific path that changed.
                this.notify(path);
            }
        }

        /**
         * Returns a deep copy of the current full state object.
         * @returns {object}
         */
        getData() {
            return deepClone(this.state);
        }

        /**
         * Replaces the entire state with a new object and notifies listeners.
         * Triggers notifications for all top-level keys in both old and new states.
         * @param {object} newState - The new full state object. Must be a valid object (null is ignored).
         */
        replaceState(newState) {
            if (!newState || typeof newState !== 'object') {
                Logger.warn('Store', '', 'ReactiveStore.replaceState: Invalid state object.');
                return;
            }

            const oldState = this.state;
            this.state = deepClone(newState);

            // Notify for the union of keys in old and new states to ensure deleted keys are handled
            const keys = new Set([...Object.keys(oldState || {}), ...Object.keys(this.state || {})]);

            keys.forEach((key) => {
                this.notify(key);
            });
        }

        /**
         * Subscribes to store updates.
         * WARNING: The state object passed to the callback is a direct reference to the store's internal state.
         * Do not mutate the state object directly within the callback. Use store.set() for updates.
         * @param {function(object, string): void} callback - The function to call on update. Receives (state, changedPath).
         * @returns {function(): void} A function to unsubscribe.
         */
        subscribe(callback) {
            if (typeof callback !== 'function') {
                Logger.warn('Store', '', 'ReactiveStore.subscribe: Callback must be a function.');
                return () => {};
            }
            this.listeners.add(callback);
            return () => this.listeners.delete(callback);
        }

        /**
         * @private
         * Notifies all subscribers of a change.
         * @param {string} changedPath - The path that was updated.
         */
        notify(changedPath) {
            for (const listener of this.listeners) {
                try {
                    listener(this.state, changedPath);
                } catch (e) {
                    Logger.error('Store', '', 'ReactiveStore listener failed:', e);
                }
            }
        }
    }

    /**
     * @class ComponentRegistry
     * @description Registry for UI components used by FormEngine.
     */
    class ComponentRegistry {
        static components = new Map();

        /**
         * Registers a component definition.
         * @param {string} type - Component type name.
         * @param {object} def - Component definition containing render logic.
         */
        static register(type, def) {
            this.components.set(type, def);
        }

        /**
         * Retrieves a component definition.
         * @param {string} type
         * @returns {object|undefined}
         */
        static get(type) {
            return this.components.get(type);
        }
    }

    /**
     * @class FormEngine
     * @description A reactive form engine that binds a schema to a ReactiveStore.
     * Handles DOM generation, event binding, and dynamic property updates.
     */
    class FormEngine {
        /**
         * @param {ReactiveStore} store - The data store.
         * @param {Array<object>|object} schema - The UI schema.
         * @param {object} context - Context object containing styles, etc.
         */
        constructor(store, schema, context) {
            this.store = store;
            this.schema = Array.isArray(schema) ? schema : [schema];
            this.context = context;
            this.elements = new Map(); // Map<schemaId, HTMLElement>
            this.unsubscribers = [];
            this.boundEventListeners = [];

            // Bind methods
            this._handleInput = this._handleInput.bind(this);
            this._handleStoreUpdate = this._handleStoreUpdate.bind(this);
        }

        /**
         * Renders the form definition into a DocumentFragment.
         * @returns {DocumentFragment}
         */
        render() {
            const fragment = document.createDocumentFragment();
            this._renderRecursive(this.schema, fragment);

            // Setup reactivity after rendering
            this.unsubscribers.push(this.store.subscribe(this._handleStoreUpdate));

            // Initial evaluation of dynamic properties
            this._evaluateDynamicProperties(this.store.getData());

            return fragment;
        }

        destroy() {
            this.unsubscribers.forEach((unsub) => unsub());
            this.unsubscribers = [];

            // Clean up event listeners explicitly to prevent memory leaks
            this.boundEventListeners.forEach(({ element, type, handler }) => {
                element.removeEventListener(type, handler);
            });
            this.boundEventListeners = [];

            // Execute component-specific cleanup logic
            for (const { element, node } of this.elements.values()) {
                const component = ComponentRegistry.get(node.type);
                if (component && typeof component.destroy === 'function') {
                    try {
                        component.destroy(element);
                    } catch (e) {
                        Logger.warn('FormEngine', LOG_STYLES.YELLOW, `Error destroying component "${node.type}"`, e);
                    }
                }
            }

            this.elements.clear();
        }

        /**
         * @private
         */
        _renderRecursive(schemaNodes, parent) {
            for (const node of schemaNodes) {
                const component = ComponentRegistry.get(node.type);
                if (!component) {
                    Logger.warn('FormEngine', '', `Unknown component type "${node.type}"`);
                    continue;
                }

                // Render the component
                const element = component.render(node, this.context, this);

                if (element) {
                    const nodeId = node.id || `_node_${Math.random().toString(36).slice(2)}`;
                    node._internalId = nodeId;
                    this.elements.set(nodeId, { element, node });

                    // Bind events if the component is interactive
                    if (node.configKey) {
                        this._bindInteractiveElement(element, node);
                    }

                    // Recursively render children if applicable
                    // Some components might handle children rendering internally (e.g. specialized containers),
                    // but the default behavior is to append them.
                    if (node.children && !component.handlesChildren) {
                        const container = component.getContentContainer ? component.getContentContainer(element) : element;
                        this._renderRecursive(node.children, container);
                    }

                    parent.appendChild(element);
                }
            }
        }

        /**
         * @private
         */
        _bindInteractiveElement(rootElement, node) {
            const component = ComponentRegistry.get(node.type);

            // Skip default binding if component handles it manually
            if (component && component.manualBinding) {
                // Just trigger initial update to sync UI with Store
                const value = this.store.get(node.configKey);
                if (component.onUpdate) {
                    component.onUpdate(rootElement, value, this.context, node);
                }
                return;
            }

            // Find the actual input element.
            let input = rootElement.matches('input, select, textarea') ? rootElement : rootElement.querySelector('input, select, textarea');

            if (!input) {
                input = rootElement;
            }

            // Retrieve initial value once
            const initialValue = this.store.get(node.configKey);

            // Check if input is a file input using selector match (safer than type property)
            const isFileInput = input.matches('input[type="file"]');

            // Set initial value (skip for file inputs to avoid security errors)
            if (!isFileInput) {
                this._setElementValue(input, initialValue, node);
            }

            // Initial UI update (for auxiliary displays like slider values)
            if (component && component.onUpdate) {
                component.onUpdate(input, initialValue, this.context, node);
            }

            // Listen for changes
            const handler = (e) => this._handleInput(e, node);

            // Determine correct event type to avoid double subscription
            let useChangeEvent = false;
            if (input.tagName === 'SELECT') {
                useChangeEvent = true;
            } else if (input.matches('input[type="checkbox"], input[type="radio"], input[type="file"]')) {
                useChangeEvent = true;
            }

            const eventType = useChangeEvent ? 'change' : 'input';

            input.addEventListener(eventType, handler);
            this.boundEventListeners.push({ element: input, type: eventType, handler });
        }

        /**
         * @private
         */
        _handleInput(e, node) {
            const target = e.target;
            let value;

            if (target.type === 'checkbox') {
                value = target.checked;
            } else if (target.type === 'number') {
                const floatVal = parseFloat(target.value);
                // Convert NaN (invalid input or empty string) to null for safety
                value = Number.isNaN(floatVal) ? null : floatVal;
            } else {
                // Convert empty string to null for text inputs
                value = target.value === '' ? null : target.value;
            }

            // Execute transformation hook if defined (UI Value -> Store Value)
            if (node.transformValue) {
                value = node.transformValue(value);
            }

            this.store.set(node.configKey, value);

            // Execute side-effect hook if defined
            if (node.onChange) {
                node.onChange(value, this.store.getData());
            }
        }

        _setElementValue(element, value, node) {
            // Apply transformation from Store Value -> UI Input Value if defined
            let inputValue = value;
            if (node && node.toInputValue) {
                inputValue = node.toInputValue(value);
            }

            if (element.type === 'checkbox') {
                element.checked = !!inputValue;
            } else if (element.type === 'number') {
                // Handle null/undefined for numeric inputs
                if (inputValue === null || inputValue === undefined) {
                    // Check for dataset defaults or specific logic (can be extended)
                    element.value = element.min || 0;
                } else {
                    element.value = inputValue;
                }
            } else {
                element.value = inputValue === null || inputValue === undefined ? '' : inputValue;
            }
        }

        /**
         * @private
         */
        _handleStoreUpdate(state, changedPath) {
            // 1. Update bound values
            for (const { element, node } of this.elements.values()) {
                // Check for exact match, parent path match (changedPath is parent), OR child path match (changedPath is child)
                // This ensures bi-directional updates:
                // - Parent change updates children (e.g. store.set('user', ...) updates 'user.name' input)
                // - Child change updates parent (e.g. store.set('user.name', ...) updates 'user' bound component)
                if (node.configKey && typeof changedPath === 'string' && (node.configKey === changedPath || node.configKey.startsWith(changedPath + '.') || changedPath.startsWith(node.configKey + '.'))) {
                    const component = ComponentRegistry.get(node.type);
                    const newValue = this.store.get(node.configKey);

                    // Handle manual binding components (e.g. padding slider)
                    // These components manage their own internal state updates via onUpdate
                    if (component && component.manualBinding) {
                        if (component.onUpdate) {
                            component.onUpdate(element, newValue, this.context, node);
                        }
                        continue;
                    }

                    // Default behavior for standard inputs
                    const input = element.matches('input, select, textarea') ? element : element.querySelector('input, select, textarea');
                    if (input) {
                        // Only update DOM if different to prevent cursor jumping
                        if (input.type === 'checkbox') {
                            if (input.checked !== !!newValue) input.checked = !!newValue;
                        } else {
                            // Calculate expected UI value to compare
                            let expectedValue = newValue;
                            if (node.toInputValue) {
                                expectedValue = node.toInputValue(newValue);
                            }
                            // Loose equality check to allow string/number conversions
                            // eslint-disable-next-line eqeqeq
                            if (input.value != expectedValue) this._setElementValue(input, newValue, node);
                        }

                        // Trigger UI update hook
                        if (component && component.onUpdate) {
                            component.onUpdate(input, newValue, this.context, node);
                        }
                    } else if (component && component.onUpdate) {
                        component.onUpdate(element, newValue, this.context, node);
                    }
                }
            }

            // 2. Evaluate dynamic properties (visibility, disabled state)
            this._evaluateDynamicProperties(state);
        }

        /**
         * @private
         */
        _evaluateDynamicProperties(state) {
            for (const { element, node } of this.elements.values()) {
                // Visibility
                if (node.visibleIf) {
                    const isVisible = node.visibleIf(state);
                    element.style.display = isVisible ? '' : 'none';
                }

                // Disabled state
                if (node.disabledIf) {
                    const isDisabled = node.disabledIf(state);
                    const targets = element.matches('input, select, textarea, button') ? [element] : element.querySelectorAll('input, select, textarea, button');
                    targets.forEach((t) => (t.disabled = isDisabled));

                    // Style adjustments for containers
                    if (isDisabled) {
                        element.classList.add('is-disabled');
                        element.style.opacity = '0.5';
                        element.style.pointerEvents = 'none';
                    } else {
                        element.classList.remove('is-disabled');
                        element.style.opacity = '';
                        element.style.pointerEvents = '';
                    }
                }
            }
        }
    }

    const SchemaBuilder = {
        create(type, id, props = {}) {
            return { type, id, ...props };
        },
        Group(label, children, options = {}) {
            return { type: 'group', label, children, ...options };
        },
        Row(children, options = {}) {
            return { type: 'row', children, ...options };
        },
        Separator(options = {}) {
            return { type: 'separator', ...options };
        },
        Container(children, options = {}) {
            return { type: 'container', children, ...options };
        },
        Label(text, options = {}) {
            return { type: 'label', text, ...options };
        },
        Text(key, label, options = {}) {
            return { type: 'text', configKey: key, label, ...options };
        },
        TextArea(key, label, options = {}) {
            return { type: 'textarea', configKey: key, label, ...options };
        },
        Toggle(key, label, options = {}) {
            return { type: 'toggle', configKey: key, label, ...options };
        },
        Select(key, label, optionValues, options = {}) {
            return { type: 'select', configKey: key, label, options: optionValues, ...options };
        },
        Button(id, text, onClick, options = {}) {
            return { type: 'button', id, text, onClick, ...options };
        },
        CodeEditor(key, options = {}) {
            return { type: 'code-editor', configKey: key, ...options };
        },
        TextDisplay(key, options = {}) {
            return { type: 'text-display', configKey: key, ...options };
        },
    };

    /**
     * Registers standard UI components to the registry.
     */
    function registerFormComponents() {
        ComponentRegistry.register('group', {
            render(node, context) {
                const cls = context.styles;
                const className = node.className ? `${cls.submenuFieldset} ${node.className}` : cls.submenuFieldset;
                return h('fieldset', { className }, [h('legend', { title: node.title }, node.label)]);
            },
        });

        ComponentRegistry.register('row', {
            render(node, context) {
                const cls = context.styles;
                let className = cls.submenuRow;
                if (node.className) {
                    const mapped = cls[node.className]; // Check for mapped alias (e.g. topRow)
                    className = mapped ? mapped : `${className} ${node.className}`;
                }
                return h('div', { className });
            },
        });

        ComponentRegistry.register('separator', {
            render(node, context) {
                return h('div', { className: context.styles.submenuSeparator });
            },
        });

        ComponentRegistry.register('container', {
            render(node, context) {
                const cls = context.styles;
                let className = '';
                if (node.className) {
                    const mapped = cls[node.className];
                    className = mapped || node.className;
                }
                return h('div', { className });
            },
        });

        ComponentRegistry.register('label', {
            render(node) {
                return h('label', { htmlFor: node.for, title: node.title }, node.text);
            },
        });

        ComponentRegistry.register('select', {
            render(node, context) {
                const cls = context.styles;
                const select = h('select', { id: node.id, title: node.title, className: cls.selectInput });
                const options = resolveSelectOptions(node, context?.store?.getData?.());
                populateSelectOptions(select, options);
                if (node.label) {
                    return h('div', {}, [h('label', { title: node.title }, node.label), select]);
                }
                return select;
            },
            onUpdate(element, value, context, node) {
                const select = element.matches('select') ? element : element.querySelector('select');
                if (!select) return;
                const options = resolveSelectOptions(node, context?.store?.getData?.());
                populateSelectOptions(select, options);
                select.value = value;
                if (!options.find((opt) => opt.value === value) && options.length > 0 && context?.store) {
                    context.store.set(node.configKey, options[0].value);
                }
            },
        });

        ComponentRegistry.register('toggle', {
            render(node, context) {
                const cls = context.styles;
                return h('label', { className: cls.toggleSwitch, title: node.title }, [h('input', { type: 'checkbox', id: node.id }), h('span', { className: cls.toggleSlider })]);
            },
        });

        ComponentRegistry.register('button', {
            render(node, context) {
                const cls = context.styles;
                const btnClass = node.className ? `${cls.modalButton} ${node.className}` : cls.modalButton;
                return h(
                    'button',
                    {
                        id: node.id,
                        className: btnClass,
                        title: node.title,
                        type: 'button',
                        style: { width: node.fullWidth ? '100%' : 'auto' },
                        onclick: (e) => {
                            e.preventDefault();
                            if (node.onClick) node.onClick(e);
                        },
                    },
                    node.text
                );
            },
        });

        ComponentRegistry.register('text', {
            render(node, context) {
                const cls = context.styles;
                // Reuse selectInput style for text inputs to ensure consistency
                const input = h('input', { type: 'text', id: node.id, title: node.title, className: cls.selectInput });
                if (node.label) {
                    return h('div', {}, [h('label', { title: node.title }, node.label), input]);
                }
                return input;
            },
        });

        ComponentRegistry.register('textarea', {
            render(node, context) {
                const cls = context.styles;
                // Reuse selectInput style for textareas to ensure consistency
                const textarea = h('textarea', { id: node.id, rows: node.rows || 3, title: node.title, className: cls.selectInput });
                if (node.label) {
                    return h('div', {}, [h('label', { title: node.title }, node.label), textarea]);
                }
                return textarea;
            },
        });

        ComponentRegistry.register('code-editor', {
            manualBinding: true,
            render(node, context, engine) {
                // Use class from context if available, or fallback
                const cls = context.styles;
                return h('textarea', {
                    className: cls.editor || `${APPID}-json-editor`,
                    spellcheck: false,
                    oninput: (e) => {
                        engine.store.set(node.configKey, e.target.value);
                        if (node.onChange) node.onChange(e.target.value, engine.store.getData());
                    },
                });
            },
            onUpdate(element, value) {
                if (!(element instanceof HTMLTextAreaElement)) return;
                if (document.activeElement === element) return;
                element.value = value || '';
            },
        });

        ComponentRegistry.register('text-display', {
            manualBinding: true,
            render(node, context) {
                // Map className using context.styles if possible
                let className = node.className || '';
                if (context.styles && context.styles[node.className]) {
                    className = context.styles[node.className];
                } else if (node.className) {
                    // Fallback to raw class name if not in map
                    className = node.className;
                }
                return h('div', { className });
            },
            onUpdate(element, value) {
                if (value && typeof value === 'object') {
                    element.textContent = value.text || '';
                    element.style.color = value.color || '';
                    element.style.fontWeight = value.bold ? 'bold' : 'normal';
                    element.title = value.title || '';
                } else {
                    element.textContent = value || '';
                    element.style.color = '';
                    element.style.fontWeight = 'normal';
                    element.title = '';
                }
            },
        });

        ComponentRegistry.register('text-list', {
            manualBinding: true, // Required: Control own rendering

            render(node, context) {
                const cls = context.styles;
                // Return container only. Content is rendered in onUpdate.
                return h(`div.${cls.scrollableArea}`, {
                    dataset: { fingerprint: '' },
                });
            },

            onUpdate(element, value, context, node) {
                // Initialization check
                if (!context?.textEditor || !value) return;

                const { currentTexts, listFingerprint, focusedIndex } = value;
                const prevFingerprint = element.dataset.fingerprint;

                // Lazy Sync: Re-render only when Fingerprint (structure) changes
                // Text input (input event) does not change Fingerprint, so this block is skipped
                if (prevFingerprint === String(listFingerprint)) {
                    return;
                }

                // --- Re-render process ---
                element.replaceChildren(); // Clear (CSP safe)
                element.dataset.fingerprint = listFingerprint;
                const cls = context.styles;

                currentTexts.forEach((text, index) => {
                    const textItem = h(`div.${cls.textItem}`, { 'data-index': index }, [
                        // Drag handle
                        h(`div.${cls.dragHandle}`, { title: 'Drag to reorder', draggable: 'true' }, [createIconFromDef(StyleDefinitions.ICONS.dragHandle)]),
                        // Textarea
                        h('textarea', {
                            'data-index': index,
                            rows: 3,
                            value: text, // Initial value
                            // Input event: Update Store value but do NOT update Fingerprint (Avoid re-render)
                            oninput: (e) => {
                                context.textEditor._handleTextPixelInput(index, e.target.value);
                                // Auto resize
                                e.target.style.height = 'auto';
                                e.target.style.height = `${e.target.scrollHeight}px`;
                            },
                            // Track focus to determine insertion point for 'New' button
                            onfocus: () => {
                                context.store.set('editor.focusedIndex', index);
                            },
                        }),
                        // Controls
                        h(`div.${cls.itemControls}`, [
                            h(`button.${cls.modalButton}.${cls.moveBtn}.move-up-btn`, { title: 'Move up', disabled: index === 0 }, [createIconFromDef(StyleDefinitions.ICONS.up)]),
                            h(`button.${cls.modalButton}.${cls.moveBtn}.move-down-btn`, { title: 'Move down', disabled: index === currentTexts.length - 1 }, [createIconFromDef(StyleDefinitions.ICONS.down)]),
                            h(`button.${cls.modalButton}.${cls.deleteBtn}.delete-btn`, { title: 'Delete' }, [createIconFromDef(StyleDefinitions.ICONS.delete)]),
                        ]),
                    ]);
                    element.appendChild(textItem);
                });

                // Auto resize (for initial display)
                requestAnimationFrame(() => {
                    element.querySelectorAll('textarea').forEach((ta) => {
                        ta.style.height = 'auto';
                        ta.style.height = `${ta.scrollHeight}px`;
                    });

                    // Restore focus
                    if (focusedIndex >= 0 && focusedIndex < currentTexts.length) {
                        const target = element.querySelector(`textarea[data-index="${focusedIndex}"]`);
                        if (target) {
                            target.focus();
                            // Set cursor to end
                            const len = target.value.length;
                            target.setSelectionRange(len, len);
                        }
                    }
                });
            },
        });

        ComponentRegistry.register('text-editor-header', {
            manualBinding: true,
            render(node, context) {
                return context?.textEditor?._createHeaderControls() || null;
            },
            onUpdate(element, value, context, node) {
                if (!context?.textEditor || !value) return;

                // --- Add guard to prevent unnecessary re-renders ---
                const { activeProfile, activeCategory, mode, targetType, lastUpdated } = value;
                const newRenderState = JSON.stringify({ p: activeProfile, c: activeCategory, m: mode, t: targetType, u: lastUpdated });

                if (element.dataset.renderState === newRenderState) {
                    return;
                }
                element.dataset.renderState = newRenderState;
                // ---------------------------------------

                const { cachedConfig } = context.textEditor;
                if (!cachedConfig) return;

                const cls = context.styles;
                const isAnyRenaming = mode === 'rename';
                const isAnyDeleting = mode === 'delete_confirm';
                const isAnyActionInProgress = isAnyRenaming || isAnyDeleting;

                // Get profile and category keys
                const profiles = cachedConfig.texts || [];
                const profileKeys = profiles.map((p) => p.name);

                const activeProfileObj = profiles.find((p) => p.name === activeProfile);
                const categories = activeProfileObj ? activeProfileObj.categories : [];
                const categoryKeys = categories.map((c) => c.name);

                // Update logic per row
                const updateRow = (type, keys, activeKey) => {
                    const row = element.querySelector(`.${cls.headerRow}[data-type="${type}"]`);
                    if (!row) return;

                    const isRenamingThis = isAnyRenaming && targetType === type;
                    const isDeletingThis = isAnyDeleting && targetType === type;
                    const isTargetDisabled = isAnyActionInProgress && targetType !== type;

                    row.classList.toggle('is-disabled', isTargetDisabled);

                    const select = row.querySelector('select');
                    const renameInput = row.querySelector('input[type="text"]');
                    const mainActions = row.querySelector(`.${cls.mainActions}`);
                    const renameActions = row.querySelector(`.${cls.renameActions}`);
                    const deleteConfirmGroup = row.querySelector(`.${cls.deleteConfirmGroup}`);

                    // Toggle Select / Input display
                    select.style.display = isRenamingThis ? 'none' : 'block';
                    renameInput.style.display = isRenamingThis ? 'block' : 'none';

                    // Toggle button area display
                    mainActions.style.visibility = !isRenamingThis && !isDeletingThis ? 'visible' : 'hidden';
                    renameActions.style.display = isRenamingThis ? 'flex' : 'none';
                    deleteConfirmGroup.style.display = isDeletingThis ? 'flex' : 'none';

                    // Update Select options (only when not renaming)
                    if (!isRenamingThis) {
                        const currentScroll = select.scrollTop;
                        // Check for diff update (simple)
                        const newSignature = keys.join('|');
                        if (select.dataset.signature !== newSignature || select.value !== activeKey) {
                            select.textContent = '';
                            keys.forEach((key, index) => select.appendChild(h('option', { value: key }, `${index + 1}. ${key}`)));
                            select.dataset.signature = newSignature;
                        }
                        select.value = activeKey;
                        select.scrollTop = currentScroll;
                    } else {
                        renameInput.value = activeKey;
                    }

                    // Button activity control
                    const upBtn = row.querySelector(`#${APPID}-${type}-up-btn`);
                    const downBtn = row.querySelector(`#${APPID}-${type}-down-btn`);
                    const deleteBtn = row.querySelector(`#${APPID}-${type}-delete-btn`);
                    const newBtn = row.querySelector(`#${APPID}-${type}-new-btn`);
                    const copyBtn = row.querySelector(`#${APPID}-${type}-copy-btn`);
                    const renameBtn = row.querySelector(`#${APPID}-${type}-rename-btn`);
                    const index = keys.indexOf(activeKey);

                    if (upBtn) upBtn.disabled = isAnyActionInProgress || index <= 0;
                    if (downBtn) downBtn.disabled = isAnyActionInProgress || index >= keys.length - 1;
                    if (deleteBtn) deleteBtn.disabled = isAnyActionInProgress || keys.length <= 1;
                    if (newBtn) newBtn.disabled = isAnyActionInProgress;
                    if (copyBtn) copyBtn.disabled = isAnyActionInProgress;
                    if (renameBtn) renameBtn.disabled = isAnyActionInProgress;
                };

                updateRow('profile', profileKeys, activeProfile);
                updateRow('category', categoryKeys, activeCategory);

                // Control the entire modal (footer buttons, etc.)
                const modalElement = context.textEditor.modal.element;
                const scrollArea = modalElement.querySelector(`.${cls.scrollableArea}`);

                if (scrollArea) scrollArea.classList.toggle('is-disabled', isAnyActionInProgress);

                const setDisabled = (selector, disabled) => {
                    const el = modalElement.querySelector(selector);
                    if (el) el.disabled = disabled;
                };

                setDisabled(`#${APPID}-text-new-btn`, isAnyActionInProgress);
                setDisabled(`#${APPID}-editor-modal-apply-btn`, isAnyActionInProgress);
                setDisabled(`#${APPID}-editor-modal-save-btn`, isAnyActionInProgress);
                setDisabled(`#${APPID}-editor-modal-cancel-btn`, isAnyActionInProgress);
            },
        });
    }

    function resolveSelectOptions(node, data) {
        if (typeof node.options === 'function') {
            return normalizeOptions(node.options(data));
        }
        return normalizeOptions(node.options || []);
    }

    function normalizeOptions(options) {
        return (options || []).map((opt) => {
            if (typeof opt === 'string') {
                return { value: opt, label: opt };
            }
            return { value: opt.value, label: opt.label ?? opt.value };
        });
    }

    function populateSelectOptions(select, options) {
        const signature = JSON.stringify(options);
        if (select.dataset.optionsSignature === signature) return;
        select.dataset.optionsSignature = signature;
        select.textContent = '';
        options.forEach((opt) => select.appendChild(h('option', { value: opt.value }, opt.label)));
    }

    registerFormComponents();

    // =================================================================================
    // SECTION: Configuration Processor
    // Description: Handles validation, sanitization, and merging of configuration data.
    // =================================================================================

    const ConfigProcessor = {
        /**
         * Processes and sanitizes an entire configuration object.
         * @param {object|null} userConfig The user configuration object (partial or full).
         * @returns {object} The complete, sanitized configuration object.
         */
        process(userConfig) {
            // 1. Start with a deep copy of the defaults.
            const completeConfig = deepClone(DEFAULT_CONFIG);

            if (isObject(userConfig)) {
                // 2. Merge user config into default config.
                // resolveConfig enforces the structure of completeConfig (DEFAULT_CONFIG),
                // automatically ignoring keys like 'system' that don't exist in the default.
                resolveConfig(completeConfig, userConfig);
            }

            // 3. Sanitize specific structures (Deep validation & Migration for texts)
            // Even if 'texts' was overwritten with an old object format by resolveConfig,
            // _sanitizeTexts handles the migration to array format.
            completeConfig.texts = this._sanitizeTexts(completeConfig.texts);

            // 4. Validate Options (Consistency check)
            this._validateOptions(completeConfig);

            return completeConfig;
        },

        /**
         * Migrates old object-based texts structure to new array-based structure.
         * @param {object} oldTexts The old texts object.
         * @returns {Array} The new texts array.
         */
        _migrateTexts(oldTexts) {
            if (!isObject(oldTexts)) return [];
            return Object.keys(oldTexts).map((profileName) => {
                const profileObj = oldTexts[profileName] || {};
                const categories = Object.keys(profileObj).map((catName) => ({
                    name: catName,
                    items: Array.isArray(profileObj[catName]) ? profileObj[catName] : [],
                }));
                return {
                    name: profileName,
                    categories: categories,
                };
            });
        },

        /**
         * Sanitizes the nested texts structure.
         * Handles migration from Object to Array and enforces unique names.
         * @param {object|Array} texts
         * @returns {Array} Sanitized texts array
         */
        _sanitizeTexts(texts) {
            // 1. Migration: Convert object to array if necessary
            const profiles = Array.isArray(texts) ? texts : this._migrateTexts(texts);

            // 2. Sanitize contents
            const sanitizedProfiles = [];
            const usedProfileNames = new Set();

            for (const profile of profiles) {
                if (!isObject(profile)) continue;

                let pName = String(profile.name || 'Untitled Profile').trim();
                if (!pName) pName = 'Untitled Profile';

                // Unique Profile Name Enforcement
                if (usedProfileNames.has(pName)) {
                    let counter = 2;
                    while (usedProfileNames.has(`${pName} ${counter}`)) counter++;
                    pName = `${pName} ${counter}`;
                }
                usedProfileNames.add(pName);

                // Sanitize Categories
                const rawCategories = Array.isArray(profile.categories) ? profile.categories : [];
                const sanitizedCategories = [];
                const usedCatNames = new Set();

                for (const cat of rawCategories) {
                    if (!isObject(cat)) continue;

                    let cName = String(cat.name || 'Untitled Category').trim();
                    if (!cName) cName = 'Untitled Category';

                    // Unique Category Name Enforcement
                    if (usedCatNames.has(cName)) {
                        let counter = 2;
                        while (usedCatNames.has(`${cName} ${counter}`)) counter++;
                        cName = `${cName} ${counter}`;
                    }
                    usedCatNames.add(cName);

                    // Sanitize Items
                    const rawItems = Array.isArray(cat.items) ? cat.items : [];
                    const items = rawItems.map((item) => {
                        if (typeof item !== 'string') {
                            Logger.warn('SANITIZER', LOG_STYLES.YELLOW, `Sanitizing invalid text entry: Item in category "${cName}" was not a string.`);
                            return String(item);
                        }
                        return item;
                    });

                    sanitizedCategories.push({
                        name: cName,
                        items: items,
                    });
                }

                // Ensure there's at least one category
                if (sanitizedCategories.length === 0) {
                    Logger.warn('SANITIZER', LOG_STYLES.YELLOW, `Profile "${pName}" has no categories. Adding a default category.`);
                    sanitizedCategories.push({ name: 'New Category', items: [] });
                }

                sanitizedProfiles.push({
                    name: pName,
                    categories: sanitizedCategories,
                });
            }

            // Ensure there's at least one profile.
            if (sanitizedProfiles.length === 0) {
                Logger.warn('', '', 'Configuration resulted in no profiles after sanitization. Restoring default texts structure.');
                // Restore from default config (already array structure)
                return deepClone(DEFAULT_CONFIG.texts);
            }

            return sanitizedProfiles;
        },

        /**
         * Validates and corrects option values based on the sanitized config.
         * @param {object} config
         */
        _validateOptions(config) {
            // Ensure options object exists
            if (!config.options) {
                config.options = deepClone(DEFAULT_CONFIG.options);
            }

            // Validate activeProfileName (against Array structure)
            const activeProfileName = config.options.activeProfileName;
            const profileExists = config.texts.some((p) => p.name === activeProfileName);

            if (!profileExists) {
                const fallback = config.texts.length > 0 ? config.texts[0].name : null;
                Logger.info('CONFIG', LOG_STYLES.YELLOW, `Active profile "${activeProfileName || 'undefined'}" not found. Falling back to "${fallback}".`);
                config.options.activeProfileName = fallback;
            }

            // Validate logger_level
            const validLevels = Object.keys(Logger.levels);
            if (!config.developer || !validLevels.includes(config.developer.logger_level)) {
                Logger.warn('CONFIG', LOG_STYLES.YELLOW, `Invalid or missing logger_level. Resetting to default '${DEFAULT_CONFIG.developer.logger_level}'.`);
                if (!config.developer) config.developer = {};
                config.developer.logger_level = DEFAULT_CONFIG.developer.logger_level;
            }
        },
    };

    // =================================================================================
    // SECTION: Configuration Management (GM Storage)
    // =================================================================================

    class ConfigManager extends BaseManager {
        constructor() {
            super();
            this.CONFIG_KEY = CONSTANTS.CONFIG_KEY;
            this.DEFAULT_CONFIG = DEFAULT_CONFIG;
            /** @type {object|null} */
            this.config = null;
        }

        /**
         * @returns {object|null} The current configuration object.
         */
        get() {
            return this.config;
        }

        /**
         * Loads the configuration from storage, delegates processing to ConfigProcessor.
         */
        async load() {
            const raw = await GM_getValue(this.CONFIG_KEY);
            let userConfig = null;
            if (raw) {
                try {
                    userConfig = JSON.parse(raw);
                } catch (e) {
                    Logger.error('LOAD FAILED', LOG_STYLES.RED, 'Failed to parse configuration. Using default settings.', e);
                    userConfig = null;
                }
            }
            this.config = ConfigProcessor.process(userConfig);
        }

        /**
         * Processes via ConfigProcessor, checks size, and saves to storage.
         * @param {object} obj The configuration object to save.
         */
        async save(obj) {
            const completeConfig = ConfigProcessor.process(obj);

            // Size Check
            const validation = this.validateConfigSize(completeConfig);
            if (!validation.isValid) {
                EventBus.publish(EVENTS.CONFIG_SIZE_EXCEEDED, { message: validation.message });
                throw new Error(validation.message);
            }

            const jsonString = JSON.stringify(completeConfig);
            this.config = completeConfig;
            await GM_setValue(this.CONFIG_KEY, jsonString);
            EventBus.publish(EVENTS.CONFIG_SAVE_SUCCESS);
        }

        /**
         * Decodes a raw string from storage into a user configuration object.
         * @param {string | null} rawValue The raw string from GM_getValue.
         * @returns {Promise<object | null>} The parsed user configuration object, or null if parsing fails.
         */
        async decode(rawValue) {
            if (!rawValue) return null;
            try {
                const parsed = JSON.parse(rawValue);
                if (isObject(parsed)) {
                    return parsed;
                }
                return null;
            } catch (e) {
                Logger.error('LOAD FAILED', LOG_STYLES.RED, `Failed to parse raw value. Error: ${e.message}`);
                return null;
            }
        }

        /**
         * Validates if the given configuration object is within the storage size limit.
         * @param {object} configObj - The configuration object to check.
         * @returns {{ isValid: boolean, message: string | null }}
         */
        validateConfigSize(configObj) {
            const jsonString = JSON.stringify(configObj);
            const configSize = new Blob([jsonString]).size;

            if (configSize > CONSTANTS.CONFIG_SIZE_LIMIT_BYTES) {
                const sizeInMB = (configSize / 1024 / 1024).toFixed(2);
                const limitInMB = (CONSTANTS.CONFIG_SIZE_LIMIT_BYTES / 1024 / 1024).toFixed(1);
                const message = `Configuration size (${sizeInMB} MB) exceeds the ${limitInMB} MB limit.\nChanges are not saved.`;
                return { isValid: false, message };
            }

            return { isValid: true, message: null };
        }
    }

    // =================================================================================
    // SECTION: UI Elements - Components and Manager
    // =================================================================================

    /**
     * @class CustomModal
     * @description A reusable, promise-based modal component. It provides a flexible
     * structure with header, content, and footer sections, and manages its own
     * lifecycle and styles using StyleManager.
     */
    class CustomModal {
        /**
         * @param {object} [options]
         * @param {string} [options.title=''] - The title displayed in the modal header.
         * @param {string} [options.width='500px'] - The width of the modal.
         * @param {boolean} [options.closeOnBackdropClick=true] - Whether to close the modal when clicking the backdrop.
         * @param {Array<object>} [options.buttons=[]] - An array of button definitions for the footer.
         * @param {function(): void} [options.onDestroy] - A callback function executed when the modal is destroyed.
         * @param {{text: string, id: string, className: string, onClick: (modalInstance: CustomModal, event: Event) => void}} options.buttons[]
         */
        constructor(options = {}) {
            this.options = {
                title: '',
                width: 'min(500px, 95vw)', // Responsive default
                closeOnBackdropClick: true,
                buttons: [],
                onDestroy: null,
                ...options,
            };
            this.style = StyleManager.request(StyleDefinitions.getModal);
            this.commonStyle = StyleManager.request(StyleDefinitions.getCommon);
            this.element = null;
            this.dom = {}; // To hold references to internal elements like header, content, footer
            this._createModalElement();
        }

        _createModalElement() {
            const cls = this.style.classes;
            const commonCls = this.commonStyle.classes;

            // Define variables to hold references to key elements.
            let header, headerTitle, headerContent, content, footer, modalBox, footerMessage;
            // Create footer buttons declaratively using map and h().
            const buttons = this.options.buttons.map((btnDef) => {
                // Merge passed className with the common modal button class
                const fullClassName = [commonCls.modalButton, btnDef.className].filter(Boolean).join(' ');
                return h(
                    'button',
                    {
                        id: btnDef.id,
                        className: fullClassName,
                        onclick: (e) => btnDef.onClick(this, e),
                    },
                    btnDef.text
                );
            });

            const buttonGroup = h(`div.${cls.buttonGroup}`, buttons);

            // Create the entire modal structure using h().
            this.element = h(
                `dialog.${cls.dialog}`,
                (modalBox = h(`div.${cls.box}`, { style: { width: this.options.width } }, [
                    (header = h(`div.${cls.header}`, [(headerTitle = h('div', this.options.title)), (headerContent = h('div'))])),
                    (content = h(`div.${cls.content}`)),
                    (footer = h(`div.${cls.footer}`, [(footerMessage = h(`div.${cls.footerMessage}`)), buttonGroup])),
                ]))
            );

            // The 'close' event is the single source of truth for when the dialog has been dismissed.
            this.element.addEventListener('close', () => this.destroy());

            if (this.options.closeOnBackdropClick) {
                this.element.addEventListener('click', (e) => {
                    if (e.target === this.element) {
                        this.close();
                    }
                });
            }

            // Store references and append the final element to the body.
            this.dom = { header, headerTitle, headerContent, content, footer, modalBox, footerMessage };
            document.body.appendChild(this.element);
        }

        show(anchorElement = null) {
            if (this.element instanceof HTMLDialogElement && typeof this.element.showModal === 'function') {
                if (this.element.open) return; // Prevent InvalidStateError

                this.element.showModal();
                // Positioning logic
                if (anchorElement && typeof anchorElement.getBoundingClientRect === 'function') {
                    // ANCHORED POSITIONING
                    const modalBox = this.dom.modalBox;
                    const btnRect = anchorElement.getBoundingClientRect();
                    const margin = 8;
                    // Use actual offsetWidth if available, otherwise fallback to a safe fixed value (500)
                    const modalWidth = modalBox.offsetWidth || 500;
                    const modalHeight = modalBox.offsetHeight;

                    let left = btnRect.left;
                    let top = btnRect.bottom + 4;

                    if (left + modalWidth > window.innerWidth - margin) {
                        left = window.innerWidth - modalWidth - margin;
                    }

                    // Vertical collision detection & adjustment
                    if (top + modalHeight > window.innerHeight - margin) {
                        // Try positioning above the anchor
                        const topAbove = btnRect.top - modalHeight - 4;
                        if (topAbove > margin) {
                            top = topAbove;
                        } else {
                            // If it doesn't fit above, pin to the bottom edge of the window
                            top = window.innerHeight - modalHeight - margin;
                        }
                    }

                    Object.assign(this.element.style, {
                        position: 'absolute',
                        left: `${Math.max(left, margin)}px`,
                        top: `${Math.max(top, margin)}px`,
                        margin: '0',
                        transform: 'none',
                    });
                } else {
                    // DEFAULT CENTERING
                    Object.assign(this.element.style, {
                        position: 'fixed',
                        left: '50%',
                        top: '50%',
                        transform: 'translate(-50%, -50%)',
                        margin: '0',
                    });
                }
            }
        }

        close() {
            if (this.element instanceof HTMLDialogElement && this.element.open) {
                this.element.close();
            }
        }

        destroy() {
            if (!this.element) return;
            this.element.remove();
            this.element = null;

            if (this.options.onDestroy) {
                this.options.onDestroy();
            }
        }

        setContent(element) {
            this.dom.content.textContent = '';
            this.dom.content.appendChild(element);
        }

        setHeader(element) {
            this.dom.headerContent.textContent = '';
            this.dom.headerContent.appendChild(element);
        }

        getContentContainer() {
            return this.dom.content;
        }
    }

    /**
     * @abstract
     * @description Base class for a settings panel/submenu UI component.
     */
    class SettingsPanelBase extends UIComponentBase {
        constructor(callbacks) {
            super(callbacks);
            this.debouncedSave = debounce(this._handleDebouncedSave.bind(this), 300, true);
            this._handleDocumentClick = this._handleDocumentClick.bind(this);
            this._handleDocumentKeydown = this._handleDocumentKeydown.bind(this);
            this._handleConfigUpdate = this._handleConfigUpdate.bind(this);
        }

        _onInit() {
            this._subscribe(EVENTS.CONFIG_UPDATED, this._handleConfigUpdate);
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            this.hide();
            this.debouncedSave.cancel();
            super._onDestroy();
        }

        /**
         * @private
         * Collects data and calls the onSave callback. Designed to be debounced.
         */
        async _handleDebouncedSave() {
            const newConfig = await this._collectDataFromForm();
            try {
                await this.callbacks.onSave?.(newConfig);
            } catch (e) {
                // Log the error to console. User notification is handled via EventBus (CONFIG_SIZE_EXCEEDED).
                Logger.error('SAVE FAILED', LOG_STYLES.RED, 'SettingsPanel save failed:', e);
            }
        }

        /**
         * @private
         * Handles the CONFIG_UPDATED event to refresh the form if the panel is open.
         * @param {object} newConfig The updated configuration object from the event payload.
         */
        async _handleConfigUpdate(newConfig) {
            if (this.isOpen()) {
                Logger.debug('UI REFRESH', LOG_STYLES.CYAN, 'Settings panel is open, refreshing form due to config update.');
                // Pass the received config directly to populateForm
                await this.populateForm(newConfig);
            }
        }

        render() {
            this._injectStyles();
            this.element = this._createPanelContainer();
            const content = this._createPanelContent();
            this.element.appendChild(content);

            document.body.appendChild(this.element);
            this._setupEventListeners();
            return this.element;
        }

        toggle() {
            const shouldShow = this.element.style.display === 'none';
            if (shouldShow) {
                this.show();
            } else {
                this.hide();
            }
        }

        isOpen() {
            return this.element && this.element.style.display !== 'none';
        }

        async show() {
            if (this.isOpen()) return; // Prevent re-entry

            await this.populateForm();
            const anchorRect = this.callbacks.getAnchorElement().getBoundingClientRect();

            let top = anchorRect.bottom + 4;
            let left = anchorRect.left;

            this.element.style.display = 'block';
            const panelWidth = this.element.offsetWidth;
            const panelHeight = this.element.offsetHeight;

            if (left + panelWidth > window.innerWidth - 8) {
                left = window.innerWidth - panelWidth - 8;
            }
            if (top + panelHeight > window.innerHeight - 8) {
                top = window.innerHeight - panelHeight - 8;
            }

            this.element.style.left = `${Math.max(8, left)}px`;
            this.element.style.top = `${Math.max(8, top)}px`;
            document.addEventListener('click', this._handleDocumentClick, true);
            document.addEventListener('keydown', this._handleDocumentKeydown, true);
        }

        hide() {
            this.element.style.display = 'none';
            document.removeEventListener('click', this._handleDocumentClick, true);
            document.removeEventListener('keydown', this._handleDocumentKeydown, true);
        }

        _createPanelContainer() {
            return h(`div#${APPID}-settings-panel`, { style: { display: 'none' }, role: 'menu' });
        }

        _handleDocumentClick(e) {
            const anchor = this.callbacks.getAnchorElement();
            if (this.element && !this.element.contains(e.target) && anchor && !anchor.contains(e.target)) {
                this.hide();
            }
        }

        _handleDocumentKeydown(e) {
            if (e.key === 'Escape') {
                this.hide();
            }
        }

        // --- Abstract methods to be implemented by subclasses ---
        _createPanelContent() {
            throw new Error('Subclass must implement _createPanelContent()');
        }
        _injectStyles() {
            throw new Error('Subclass must implement _injectStyles()');
        }
        populateForm(config) {
            throw new Error('Subclass must implement populateForm()');
        }
        _collectDataFromForm() {
            throw new Error('Subclass must implement _collectDataFromForm()');
        }
        _setupEventListeners() {
            throw new Error('Subclass must implement _setupEventListeners()');
        }
    }

    class SettingsPanelComponent extends SettingsPanelBase {
        constructor(callbacks) {
            super(callbacks);
            this.engine = null;
            this.formContainer = null;
            this.store = new ReactiveStore(DEFAULT_CONFIG);
            this.isPopulating = false;
            this.styleHandle = null;
            this.commonStyleHandle = null;
            this.warningState = null;

            // Delegate subscription management to the base class
            this.addStoreSubscription(
                this.store.subscribe((state, changedPath) => {
                    // Prevent infinite loop: do not trigger save if the change is internal (system state)
                    if (changedPath && changedPath.startsWith('system')) return;

                    if (!this.isPopulating) {
                        this.debouncedSave();
                    }
                })
            );
        }

        _onInit() {
            super._onInit();
            this._subscribe(EVENTS.CONFIG_SIZE_EXCEEDED, ({ message }) => {
                this.warningState = { text: message };
                if (this.store) {
                    this.store.set('system.warning', this.warningState);
                }
            });
            this._subscribe(EVENTS.CONFIG_SAVE_SUCCESS, () => {
                this.warningState = null;
                if (this.store) {
                    this.store.set('system.warning', null);
                }
            });
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            this.engine?.destroy();
            this.engine = null;
            super._onDestroy();
        }

        _injectStyles() {
            this.styleHandle = StyleManager.request(StyleDefinitions.getSettingsPanel);
            this.commonStyleHandle = StyleManager.request(StyleDefinitions.getCommon);
        }

        _createPanelContainer() {
            const cls = this.styleHandle.classes;
            return h(`div#${cls.panel}`, { style: { display: 'none' }, role: 'menu' });
        }

        _getPanelSchema() {
            // Note: Schema uses logical class names mapped in StyleDefinitions
            return [
                SchemaBuilder.TextDisplay('system.warning', {
                    className: 'warningBanner',
                    visibleIf: (data) => !!data?.system?.warning,
                }),
                SchemaBuilder.Group(
                    'Default Profile',
                    [
                        SchemaBuilder.Select('options.activeProfileName', null, (data) => (data?.texts || []).map((p) => p.name), {
                            id: `${APPID}-profile-select`,
                            title: 'Select the default profile loaded on startup.',
                        }),
                    ],
                    { title: 'Select the default profile loaded on startup.' }
                ),
                SchemaBuilder.Container(
                    [
                        SchemaBuilder.Group(
                            'Texts',
                            [
                                SchemaBuilder.Button(
                                    `${APPID}-submenu-edit-texts-btn`,
                                    'Edit Texts...',
                                    () => {
                                        this.callbacks.onShowTextEditorModal?.();
                                        this.hide();
                                    },
                                    { fullWidth: true, title: 'Open the text editor.' }
                                ),
                            ],
                            { title: 'Open the text editor.' }
                        ),
                        SchemaBuilder.Group(
                            'JSON',
                            [
                                SchemaBuilder.Button(
                                    `${APPID}-submenu-json-btn`,
                                    'JSON...',
                                    () => {
                                        this.callbacks.onShowJsonModal?.();
                                        this.hide();
                                    },
                                    {
                                        fullWidth: true,
                                        title: 'Import, export, or edit settings via JSON.',
                                    }
                                ),
                            ],
                            { title: 'Import, export, or edit settings via JSON.' }
                        ),
                    ],
                    { className: 'topRow' } // Mapped to cls.topRow
                ),
                SchemaBuilder.Group(
                    'Options',
                    [
                        SchemaBuilder.Row([
                            SchemaBuilder.Label('Trigger Mode', { for: `${APPID}-opt-trigger-mode`, title: 'Choose how to open the text list.' }),
                            SchemaBuilder.Select(
                                'options.trigger_mode',
                                null,
                                [
                                    { value: 'click', label: 'Click' },
                                    { value: 'hover', label: 'Hover' },
                                ],
                                {
                                    id: `${APPID}-opt-trigger-mode`,
                                    title: '"Click" opens on click, "Hover" opens on mouse over.',
                                }
                            ),
                        ]),
                        SchemaBuilder.Row([
                            SchemaBuilder.Label('Enable Shortcut to Trigger (Alt+Q)', {
                                for: `${APPID}-opt-enable-shortcut`,
                                title: 'Enables the keyboard shortcut (Alt+Q) to toggle the Text List.',
                            }),
                            SchemaBuilder.Toggle('options.enable_shortcut', null, {
                                id: `${APPID}-opt-enable-shortcut`,
                                title: 'Enables the keyboard shortcut (Alt+Q) to toggle the Text List.',
                            }),
                        ]),
                        SchemaBuilder.Container(
                            [
                                SchemaBuilder.Button(
                                    `${APPID}-submenu-shortcut-btn`,
                                    'Shortcuts & Controls',
                                    () => {
                                        this.callbacks.onShowShortcutModal?.();
                                        this.hide();
                                    },
                                    { title: 'Show the keyboard shortcuts cheat sheet.' }
                                ),
                            ],
                            { className: 'submenuRow' }
                        ),
                        SchemaBuilder.Separator(),
                        SchemaBuilder.Row([
                            SchemaBuilder.Label('Insertion position', {
                                for: `${APPID}-opt-insertion-position`,
                                title: 'Determines where the text is inserted in the input field.',
                            }),
                            SchemaBuilder.Select(
                                'options.insertion_position',
                                null,
                                [
                                    { value: 'start', label: 'Start' },
                                    { value: 'cursor', label: 'Cursor' },
                                    { value: 'end', label: 'End' },
                                ],
                                {
                                    id: `${APPID}-opt-insertion-position`,
                                    title: 'Determines where the text is inserted in the input field.',
                                }
                            ),
                        ]),
                        SchemaBuilder.Row([
                            SchemaBuilder.Label('Insert newline before text', {
                                for: `${APPID}-opt-insert-before-newline`,
                                title: 'Automatically add a newline before the pasted text.',
                            }),
                            SchemaBuilder.Toggle('options.insert_before_newline', null, {
                                id: `${APPID}-opt-insert-before-newline`,
                                title: 'Adds a newline character before the inserted text.',
                            }),
                        ]),
                        SchemaBuilder.Row([
                            SchemaBuilder.Label('Insert newline after text', {
                                for: `${APPID}-opt-insert-after-newline`,
                                title: 'Automatically add a newline after the pasted text.',
                            }),
                            SchemaBuilder.Toggle('options.insert_after_newline', null, {
                                id: `${APPID}-opt-insert-after-newline`,
                                title: 'Adds a newline character after the inserted text.',
                            }),
                        ]),
                        SchemaBuilder.Container(
                            [SchemaBuilder.Label("Note: Option behavior may depend on the input field's state (focus and existing content). For consistent results, click an insert button while the input field is focused.")],
                            {
                                className: 'settingsNote', // Mapped to cls.settingsNote
                            }
                        ),
                    ],
                    { title: 'Configure general options and behavior.' }
                ),
            ];
        }

        _createPanelContent() {
            this.formContainer = h('div');
            return this.formContainer;
        }

        /**
         * Populates the settings form with configuration data.
         * Uses the provided config object if available, otherwise fetches the current config.
         * @param {object} [config] - Optional. The configuration object to use for population.
         */
        async populateForm(config) {
            const currentConfig = config || (await this.callbacks.getCurrentConfig());
            if (!currentConfig || !currentConfig.options) return;

            this.isPopulating = true;

            // Merge current config with warning state if present
            const storeData = deepClone(currentConfig);
            if (this.warningState) {
                storeData.system = { warning: this.warningState };
            } else {
                storeData.system = { warning: null };
            }

            // If the engine already exists, update the state instead of rebuilding the DOM.
            if (this.engine) {
                this.store.replaceState(storeData);
                this.isPopulating = false;
                return;
            }

            if (this.formContainer) {
                this.formContainer.textContent = '';
            }

            this.store.replaceState(storeData);

            const schema = this._getPanelSchema();
            // Merge styles: Common classes take precedence or serve as base, SettingsPanel classes add specifics
            const cls = { ...this.commonStyleHandle.classes, ...this.styleHandle.classes };
            const context = { styles: cls, store: this.store };

            this.engine = new FormEngine(this.store, schema, context);

            if (this.formContainer) {
                this.formContainer.appendChild(this.engine.render());
            }

            this.isPopulating = false;
        }

        async _collectDataFromForm() {
            return this.store.getData();
        }

        _setupEventListeners() {
            // Handled by FormEngine and schema onClick handlers.
        }
    }

    /**
     * Manages the Text Settings modal by leveraging the CustomModal component.
     */
    class TextEditorModalComponent extends UIComponentBase {
        constructor(callbacks) {
            super(callbacks);
            this.modal = null;
            this.store = null;
            this.headerEngine = null;
            this.contentEngine = null;
            this.draggedIndex = null;
            this.cachedConfig = null; // Config cache for Store synchronization
            this.styleHandle = null;
            this.commonStyleHandle = null;
        }

        _onInit() {
            // Subscribe to size exceeded event to show error in footer
            this._subscribe(EVENTS.CONFIG_SIZE_EXCEEDED, ({ message }) => {
                const footerMessage = this.modal?.dom?.footerMessage;
                if (footerMessage) {
                    footerMessage.textContent = message;
                    footerMessage.style.color = `var(${StyleDefinitions.VARS.TEXT_DANGER})`;
                }
            });

            // Subscribe to save success event to clear footer
            this._subscribe(EVENTS.CONFIG_SAVE_SUCCESS, () => {
                const footerMessage = this.modal?.dom?.footerMessage;
                if (footerMessage) {
                    footerMessage.textContent = '';
                    footerMessage.style.color = '';
                }
            });
        }

        _checkConfigSize() {
            if (!this.cachedConfig || !this.modal?.dom?.footerMessage) return;

            const validation = this.callbacks.checkConfigSize(this.cachedConfig);

            if (!validation.isValid) {
                const footerMessage = this.modal.dom.footerMessage;
                footerMessage.textContent = validation.message;
                footerMessage.style.color = `var(${StyleDefinitions.VARS.TEXT_DANGER})`;
            }
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            this.modal?.destroy();
            super._onDestroy();
        }

        render() {
            this.styleHandle = StyleManager.request(StyleDefinitions.getTextEditorModal);
            this.commonStyleHandle = StyleManager.request(StyleDefinitions.getCommon);
        }

        async open(targetProfile, targetCategoryKey) {
            if (this.modal || this.isOpening) return; // Prevent re-entry

            // Ensure styles are ready
            if (!this.styleHandle) this.render();

            this.isOpening = true;

            try {
                const cls = this.styleHandle.classes;
                const commonCls = this.commonStyleHandle.classes;

                // Load and cache initial config
                const globalConfig = await this.callbacks.getCurrentConfig();
                this.cachedConfig = deepClone(globalConfig);

                if (!this.cachedConfig || !this.cachedConfig.texts) return;

                // Determine initial display position
                const profiles = this.cachedConfig.texts;
                const initialProfileName = targetProfile || this.cachedConfig.options.activeProfileName || profiles[0]?.name;
                const validProfileObj = profiles.find((p) => p.name === initialProfileName) || profiles[0];
                const validProfile = validProfileObj?.name;

                const categories = validProfileObj?.categories || [];
                let initialCategory = categories[0]?.name || null;

                if (targetCategoryKey && categories.some((c) => c.name === targetCategoryKey)) {
                    initialCategory = targetCategoryKey;
                }

                this.callbacks.onModalOpenStateChange?.(true);

                // Initialize Store
                this.store = new ReactiveStore({
                    editor: {
                        activeProfile: validProfile,
                        activeCategory: initialCategory,
                        mode: 'normal', // 'normal' | 'rename' | 'delete_confirm'
                        targetType: null, // 'profile' | 'category'
                        targetKey: null,
                        currentTexts: [], // Initial value will be loaded later
                        listFingerprint: 0,
                        focusedIndex: -1,
                    },
                });

                this.modal = new CustomModal({
                    title: `${APPNAME} - Settings`,
                    width: 'min(880px, 95vw)',
                    closeOnBackdropClick: false,
                    buttons: [
                        { text: 'Cancel', id: `${APPID}-editor-modal-cancel-btn`, className: '', title: 'Discard changes and close the modal.', onClick: () => this.close() },
                        { text: 'Apply', id: `${APPID}-editor-modal-apply-btn`, className: '', title: 'Save changes and keep the modal open.', onClick: () => this._handleSaveAction(false) },
                        { text: 'Save', id: `${APPID}-editor-modal-save-btn`, className: commonCls.primaryBtn, title: 'Save changes and close the modal.', onClick: () => this._handleSaveAction(true) },
                    ],
                    onDestroy: () => {
                        this.callbacks.onModalOpenStateChange?.(false);
                        this.headerEngine?.destroy();
                        this.contentEngine?.destroy();
                        this.headerEngine = null;
                        this.contentEngine = null;
                        this.store = null;
                        this.modal = null;
                        this.cachedConfig = null;
                    },
                });

                // Context for FormEngine, providing styles and store reference
                const context = {
                    textEditor: this,
                    store: this.store,
                    styles: { ...commonCls, ...cls }, // Merge styles for usage in child components
                };

                // Header engine setup
                this.headerEngine = new FormEngine(this.store, [SchemaBuilder.create('text-editor-header', `${APPID}-text-editor-header`, { configKey: 'editor' })], context);

                // Content engine setup (Use text-list)
                this.contentEngine = new FormEngine(
                    this.store,
                    [
                        SchemaBuilder.Container([SchemaBuilder.create('text-list', `${APPID}-text-list`, { configKey: 'editor' }), SchemaBuilder.Button(`${APPID}-text-new-btn`, 'Add New Text', null, { className: commonCls.modalButton })], {
                            className: cls.modalContent,
                        }),
                    ],
                    context
                );

                const headerControls = this.headerEngine.render();
                const mainContent = this.contentEngine.render();

                Object.assign(this.modal.dom.header.style, {
                    paddingBottom: '12px',
                    display: 'flex',
                    flexDirection: 'column',
                    alignItems: 'stretch',
                    gap: '12px',
                });
                Object.assign(this.modal.dom.footer.style, {
                    paddingTop: '16px',
                });

                this.modal.setHeader(headerControls);
                this.modal.setContent(mainContent);

                this._setupEventListeners();

                // Load initial state
                this._loadStateFromConfig(validProfile, initialCategory);

                // Actively check config size and display warning if already exceeded
                this._checkConfigSize();

                this.modal.show();
            } finally {
                this.isOpening = false;
            }
        }

        close() {
            this.modal?.close();
        }

        _createHeaderControls() {
            const cls = this.styleHandle.classes;
            const commonCls = this.commonStyleHandle.classes;
            const icons = StyleDefinitions.ICONS;

            const createControlRow = (type, label) => {
                return h(`div.${cls.headerRow}`, { 'data-type': type }, [
                    // Container 1: Label
                    h('label', { htmlFor: `${APPID}-${type}-select` }, label),

                    // Container 2: Select / Input
                    h(`div.${cls.renameArea}`, [h(`select#${APPID}-${type}-select`), h('input', { type: 'text', id: `${APPID}-${type}-rename-input`, style: { display: 'none' } })]),

                    // Container 3: Action Buttons
                    h(`div.${cls.actionArea}`, [
                        h(`div.${cls.mainActions}`, [
                            h(`button#${APPID}-${type}-rename-btn.${commonCls.modalButton}`, 'Rename'),
                            h(`button#${APPID}-${type}-up-btn.${commonCls.modalButton}.${cls.moveBtn}`, [createIconFromDef(icons.up)]),
                            h(`button#${APPID}-${type}-down-btn.${commonCls.modalButton}.${cls.moveBtn}`, [createIconFromDef(icons.down)]),
                            h(`button#${APPID}-${type}-new-btn.${commonCls.modalButton}`, 'New'),
                            h(`button#${APPID}-${type}-copy-btn.${commonCls.modalButton}`, 'Copy'),
                            h(`button#${APPID}-${type}-delete-btn.${commonCls.modalButton}`, 'Delete'),
                        ]),
                        h(`div.${cls.renameActions}`, { style: { display: 'none' } }, [
                            // visibility: hidden replaced by display:none/flex in CSS, setting default here
                            h(`button#${APPID}-${type}-rename-ok-btn.${commonCls.modalButton}`, 'OK'),
                            h(`button#${APPID}-${type}-rename-cancel-btn.${commonCls.modalButton}`, 'Cancel'),
                        ]),
                        h(`div.${cls.deleteConfirmGroup}`, { style: { display: 'none' } }, [
                            h(`span.${cls.deleteConfirmLabel}`, 'Are you sure?'),
                            h(`div`, { style: { display: 'flex', gap: '8px' } }, [
                                h(`button#${APPID}-${type}-delete-confirm-btn.${commonCls.modalButton}.${cls.deleteConfirmBtnYes}`, 'Confirm Delete'),
                                h(`button#${APPID}-${type}-delete-cancel-btn.${commonCls.modalButton}`, 'Cancel'),
                            ]),
                        ]),
                    ]),
                ]);
            };

            return h(`div.${cls.headerControls}`, [createControlRow('profile', 'Profile:'), createControlRow('category', 'Category:')]);
        }

        /**
         * @private
         * @param {'profile' | 'category'} itemType The type of item to enter delete confirmation mode for.
         */
        _enterDeleteConfirmationMode(itemType) {
            if (this.store.get('editor.mode') !== 'normal') return;

            const keyToDelete = itemType === 'profile' ? this.store.get('editor.activeProfile') : this.store.get('editor.activeCategory');

            if (!keyToDelete) return;

            this.store.set('editor.mode', 'delete_confirm');
            this.store.set('editor.targetType', itemType);
            this.store.set('editor.targetKey', keyToDelete);
        }

        _exitDeleteConfirmationMode() {
            this.store.set('editor.mode', 'normal');
            this.store.set('editor.targetType', null);
            this.store.set('editor.targetKey', null);
        }

        _setupEventListeners() {
            if (!this.modal) return;
            const modalElement = this.modal.element;
            const cls = this.styleHandle.classes;

            modalElement.addEventListener('click', (e) => {
                const target = e.target.closest('button');
                if (!target) return;

                const textItemControls = target.closest(`.${cls.itemControls}`);
                if (textItemControls) {
                    const textItem = textItemControls.closest(`.${cls.textItem}`);
                    const textarea = textItem.querySelector('textarea');
                    const index = parseInt(textarea.dataset.index, 10);

                    if (target.classList.contains('move-up-btn')) this._handleTextMove(index, -1);
                    if (target.classList.contains('move-down-btn')) this._handleTextMove(index, 1);
                    if (target.classList.contains('delete-btn')) this._handleTextDelete(index);
                    return;
                }

                const actionMap = {
                    // Profile Actions
                    [`${APPID}-profile-new-btn`]: () => this._handleItemNew('profile'),
                    [`${APPID}-profile-copy-btn`]: () => this._handleItemCopy('profile'),
                    [`${APPID}-profile-delete-btn`]: () => this._enterDeleteConfirmationMode('profile'),
                    [`${APPID}-profile-delete-confirm-btn`]: () => this._handleItemDelete(),
                    [`${APPID}-profile-delete-cancel-btn`]: () => this._exitDeleteConfirmationMode(),
                    [`${APPID}-profile-up-btn`]: () => this._handleItemMove('profile', -1),
                    [`${APPID}-profile-down-btn`]: () => this._handleItemMove('profile', 1),
                    [`${APPID}-profile-rename-btn`]: () => this._enterRenameMode('profile'),
                    [`${APPID}-profile-rename-ok-btn`]: () => this._handleRenameConfirm('profile'),
                    [`${APPID}-profile-rename-cancel-btn`]: () => this._exitRenameMode(true),
                    // Category Actions
                    [`${APPID}-category-new-btn`]: () => this._handleItemNew('category'),
                    [`${APPID}-category-copy-btn`]: () => this._handleItemCopy('category'),
                    [`${APPID}-category-delete-btn`]: () => this._enterDeleteConfirmationMode('category'),
                    [`${APPID}-category-delete-confirm-btn`]: () => this._handleItemDelete(),
                    [`${APPID}-category-delete-cancel-btn`]: () => this._exitDeleteConfirmationMode(),
                    [`${APPID}-category-up-btn`]: () => this._handleItemMove('category', -1),
                    [`${APPID}-category-down-btn`]: () => this._handleItemMove('category', 1),
                    [`${APPID}-category-rename-btn`]: () => this._enterRenameMode('category'),
                    [`${APPID}-category-rename-ok-btn`]: () => this._handleRenameConfirm('category'),
                    [`${APPID}-category-rename-cancel-btn`]: () => this._exitRenameMode(true),
                    // Text Actions
                    [`${APPID}-text-new-btn`]: () => this._handleTextNew(),
                };
                const action = actionMap[target.id];
                if (action) action();
            });

            // Reflect values directly to Store (With Two-Step Commit)
            modalElement.addEventListener('change', async (e) => {
                if (e.target.matches(`#${APPID}-profile-select`)) {
                    // 1. Prepare new state
                    const newProfileName = e.target.value;
                    const profiles = this.cachedConfig.texts || [];
                    const activeProfileObj = profiles.find((p) => p.name === newProfileName);
                    const newCategory = activeProfileObj?.categories[0]?.name || null;

                    // 2. Update Store & Load new data
                    this.store.set('editor.activeProfile', newProfileName);
                    this.store.set('editor.activeCategory', newCategory);
                    this._loadStateFromConfig(newProfileName, newCategory);
                } else if (e.target.matches(`#${APPID}-category-select`)) {
                    // 1. Update Store & Load new data
                    const newCategory = e.target.value;
                    this.store.set('editor.activeCategory', newCategory);
                    this._loadStateFromConfig(this.store.get('editor.activeProfile'), newCategory);
                }
            });

            // Input handling for validation visual cues
            modalElement.addEventListener('input', (e) => {
                const target = e.target;
                if (target.matches('textarea')) {
                    target.classList.toggle('is-invalid', target.value.trim() === '');
                    const footerMessage = this.modal?.dom?.footerMessage;
                    if (footerMessage && footerMessage.textContent) {
                        footerMessage.textContent = '';
                    }
                }
                if (target.matches('input[type="text"]')) {
                    target.classList.remove('is-invalid');
                    const footerMessage = this.modal?.dom?.footerMessage;
                    if (footerMessage && footerMessage.textContent) {
                        footerMessage.textContent = '';
                    }
                }
            });

            modalElement.addEventListener('keydown', (e) => {
                if (e.target.matches('input[type="text"]')) {
                    if (e.key === 'Enter') {
                        e.preventDefault();
                        const type = e.target.id.includes('profile') ? 'profile' : 'category';
                        this._handleRenameConfirm(type);
                    }
                    if (e.key === 'Escape') {
                        e.preventDefault();
                        this._exitRenameMode(true);
                    }
                }
            });

            // Drag and Drop
            // Use the dynamic class for scrollable area
            const getScrollArea = () => modalElement.querySelector(`.${cls.scrollableArea}`);

            modalElement.addEventListener('dragstart', (e) => {
                const scrollArea = getScrollArea();
                if (!scrollArea) return;

                const handle = e.target.closest(`.${cls.dragHandle}`);
                if (handle) {
                    const target = handle.closest(`.${cls.textItem}`);
                    if (target && scrollArea.contains(target)) {
                        this.draggedIndex = parseInt(target.dataset.index, 10);
                        setTimeout(() => target.classList.add('dragging'), 0);
                    }
                }
            });

            modalElement.addEventListener('dragend', () => {
                const scrollArea = getScrollArea();
                if (!scrollArea || this.draggedIndex === null) return;

                const draggingElement = scrollArea.querySelector('.dragging');
                if (draggingElement) draggingElement.classList.remove('dragging');
                this.draggedIndex = null;
            });

            modalElement.addEventListener('dragover', (e) => {
                const scrollArea = getScrollArea();
                if (!scrollArea || !scrollArea.contains(e.target)) return;

                e.preventDefault();
                const draggingElement = scrollArea.querySelector('.dragging');
                if (!draggingElement) return;

                scrollArea.querySelectorAll(`.${cls.textItem}`).forEach((el) => {
                    el.classList.remove('drag-over-top', 'drag-over-bottom');
                });

                const target = e.target.closest(`.${cls.textItem}`);
                if (target && target !== draggingElement) {
                    const box = target.getBoundingClientRect();
                    const isAfter = e.clientY > box.top + box.height / 2;
                    target.classList.toggle('drag-over-bottom', isAfter);
                    target.classList.toggle('drag-over-top', !isAfter);
                } else if (!target) {
                    const lastElement = scrollArea.querySelector(`.${cls.textItem}:last-child:not(.dragging)`);
                    if (lastElement) {
                        lastElement.classList.add('drag-over-bottom');
                    }
                }
            });

            modalElement.addEventListener('drop', (e) => {
                const scrollArea = getScrollArea();
                if (!scrollArea || !scrollArea.contains(e.target)) return;

                e.preventDefault();
                if (this.draggedIndex === null) return;

                const dropTarget = scrollArea.querySelector('.drag-over-top, .drag-over-bottom');
                // Calculate drop index
                let dropIndex = -1;

                if (dropTarget) {
                    const targetIndex = parseInt(dropTarget.dataset.index, 10);
                    if (dropTarget.classList.contains('drag-over-bottom')) {
                        dropIndex = targetIndex + 1;
                    } else {
                        dropIndex = targetIndex;
                    }
                    // Adjust dropIndex if moving downwards
                    if (this.draggedIndex < dropIndex) {
                        dropIndex--;
                    }
                } else {
                    // Check if dropped at the end
                    const lastElement = scrollArea.querySelector(`.${cls.textItem}:last-child:not(.dragging)`);
                    if (lastElement && lastElement.classList.contains('drag-over-bottom')) {
                        dropIndex = this.store.get('editor.currentTexts').length - 1;
                    }
                }

                // Cleanup visual cues
                scrollArea.querySelectorAll(`.${cls.textItem}`).forEach((el) => {
                    el.classList.remove('drag-over-top', 'drag-over-bottom');
                });

                // Perform move if valid
                if (dropIndex !== -1 && dropIndex !== this.draggedIndex) {
                    this._handleTextMove(this.draggedIndex, dropIndex - this.draggedIndex);
                }
            });
        }

        /**
         * Commit Store's currentTexts to cachedConfig (Array-based).
         * Must be called before Profile/Category switch or Save.
         */
        _saveCurrentStateToConfig() {
            const activeProfile = this.store.get('editor.activeProfile');
            const activeCategory = this.store.get('editor.activeCategory');
            const currentTexts = this.store.get('editor.currentTexts');

            const profileObj = this.cachedConfig.texts.find((p) => p.name === activeProfile);
            if (profileObj) {
                const categoryObj = profileObj.categories.find((c) => c.name === activeCategory);
                if (categoryObj) {
                    categoryObj.items = [...currentTexts];
                }
            }
        }

        /**
         * Load data from Config cache to Store (Array-based).
         * Call on initialization or Profile/Category switch.
         */
        _loadStateFromConfig(profileName, categoryName) {
            const profileObj = this.cachedConfig.texts.find((p) => p.name === profileName);
            const categoryObj = profileObj ? profileObj.categories.find((c) => c.name === categoryName) : null;
            const texts = categoryObj ? categoryObj.items : [];

            this.store.set('editor.currentTexts', [...texts]); // Deep copy
            this.store.set('editor.listFingerprint', Date.now()); // Force render
            this.store.set('editor.focusedIndex', -1);
        }

        /**
         * Handler for text pixel input (No re-render)
         */
        _handleTextPixelInput(index, value) {
            const currentTexts = this.store.get('editor.currentTexts');
            if (currentTexts && currentTexts[index] !== undefined) {
                currentTexts[index] = value;
                // Update Store, but Fingerprint check in onUpdate prevents DOM rebuild
                this.store.set('editor.currentTexts', currentTexts);
            }
        }

        async _exitRenameMode(refresh = false) {
            const currentMode = this.store.get('editor.mode');
            if (currentMode !== 'rename') return;

            const type = this.store.get('editor.targetType');

            this.store.set('editor.mode', 'normal');
            this.store.set('editor.targetType', null);

            if (this.modal) {
                const input = this.modal.element.querySelector(`#${APPID}-${type}-rename-input`);
                if (input) input.classList.remove('is-invalid');
                const footerMessage = this.modal.dom.footerMessage;
                if (footerMessage) footerMessage.textContent = '';
            }

            // When forced update is required (e.g., on cancel, to restore original value)
            if (refresh) {
                this.store.set('editor.lastUpdated', Date.now());
            }
        }

        _getDragAfterElement(container, y) {
            const cls = this.styleHandle.classes;
            const draggableElements = [...container.querySelectorAll(`.${cls.textItem}:not(.dragging)`)];
            return draggableElements.reduce(
                (closest, child) => {
                    const box = child.getBoundingClientRect();
                    const offset = y - box.top - box.height / 2;
                    if (offset < 0 && offset > closest.offset) {
                        return { offset: offset, element: child };
                    } else {
                        return closest;
                    }
                },
                { offset: Number.NEGATIVE_INFINITY }
            ).element;
        }

        _autoResizeTextarea(textarea) {
            if (!textarea) return;
            // Temporarily set height to auto to allow the textarea to shrink if text is deleted.
            // Use requestAnimationFrame to prevent layout thrashing during rapid typing.
            requestAnimationFrame(() => {
                textarea.style.height = 'auto';
                // Set the height to its scrollHeight to fit the content.
                textarea.style.height = `${textarea.scrollHeight}px`;
            });
        }

        _handleTextNew() {
            // 1. Modify data
            const currentTexts = [...this.store.get('editor.currentTexts')];
            const focusedIndex = this.store.get('editor.focusedIndex');
            let insertIndex;

            // Determine insertion position: after the focused item, or at the end
            if (focusedIndex >= 0 && focusedIndex < currentTexts.length) {
                insertIndex = focusedIndex + 1;
            } else {
                insertIndex = currentTexts.length;
            }

            currentTexts.splice(insertIndex, 0, ''); // Insert empty text

            // 2. Update Store to trigger render
            this.store.set('editor.currentTexts', currentTexts);
            this.store.set('editor.listFingerprint', Date.now());
            this.store.set('editor.focusedIndex', insertIndex); // Focus new item
        }

        _handleTextDelete(index) {
            // 1. Modify data
            const currentTexts = this.store.get('editor.currentTexts');
            const newTexts = currentTexts.filter((_, i) => i !== index);

            // 2. Update Store to trigger render
            this.store.set('editor.currentTexts', newTexts);
            this.store.set('editor.listFingerprint', Date.now());
            this.store.set('editor.focusedIndex', -1);
        }

        _handleTextMove(index, direction) {
            // 1. Modify data
            const currentTexts = [...this.store.get('editor.currentTexts')];
            const newIndex = index + direction;

            if (newIndex < 0 || newIndex >= currentTexts.length) return;

            // Remove from old position
            const [movedItem] = currentTexts.splice(index, 1);
            // Insert at new position
            currentTexts.splice(newIndex, 0, movedItem);

            // 2. Update Store to trigger render
            this.store.set('editor.currentTexts', currentTexts);
            this.store.set('editor.listFingerprint', Date.now());
            this.store.set('editor.focusedIndex', newIndex); // Follow focus
        }

        /**
         * @private
         * @param {'profile' | 'category'} itemType The type of item to create.
         */
        async _handleItemNew(itemType) {
            const newConfig = deepClone(this.cachedConfig);
            const activeProfileName = this.store.get('editor.activeProfile');
            const activeCategoryName = this.store.get('editor.activeCategory');

            if (itemType === 'profile') {
                const profiles = newConfig.texts;
                const activeIndex = profiles.findIndex((p) => p.name === activeProfileName);
                // Insert after current or at end
                const insertIndex = activeIndex >= 0 ? activeIndex + 1 : profiles.length;

                const newName = proposeUniqueName('New Profile', profiles);
                const newProfile = {
                    name: newName,
                    categories: [{ name: 'New Category', items: [] }],
                };

                profiles.splice(insertIndex, 0, newProfile);

                await this.callbacks.onSave(newConfig);
                this.cachedConfig = newConfig;

                this.store.set('editor.activeProfile', newName);
                this.store.set('editor.activeCategory', 'New Category');
            } else {
                const profile = newConfig.texts.find((p) => p.name === activeProfileName);
                if (!profile) return;

                const categories = profile.categories;
                const activeIndex = categories.findIndex((c) => c.name === activeCategoryName);
                const insertIndex = activeIndex >= 0 ? activeIndex + 1 : categories.length;

                const newName = proposeUniqueName('New Category', categories);
                const newCategory = {
                    name: newName,
                    items: [],
                };

                categories.splice(insertIndex, 0, newCategory);

                // Update config (since profile is a reference to object inside newConfig, it's updated)
                await this.callbacks.onSave(newConfig);
                this.cachedConfig = newConfig;

                this.store.set('editor.activeCategory', newName);
            }

            // Reload texts
            this._loadStateFromConfig(this.store.get('editor.activeProfile'), this.store.get('editor.activeCategory'));

            // Enter rename mode
            this._enterRenameMode(itemType);
        }

        /**
         * @private
         * @param {'profile' | 'category'} itemType The type of item to copy.
         */
        async _handleItemCopy(itemType) {
            const newConfig = deepClone(this.cachedConfig);
            const activeProfileName = this.store.get('editor.activeProfile');
            const activeCategoryName = this.store.get('editor.activeCategory');

            if (itemType === 'profile') {
                const profiles = newConfig.texts;
                const activeIndex = profiles.findIndex((p) => p.name === activeProfileName);
                if (activeIndex === -1) return;

                const sourceProfile = profiles[activeIndex];
                const newName = proposeUniqueName(`${sourceProfile.name} Copy`, profiles);

                const newProfile = deepClone(sourceProfile);
                newProfile.name = newName;

                profiles.splice(activeIndex + 1, 0, newProfile);

                await this.callbacks.onSave(newConfig);
                this.cachedConfig = newConfig;

                this.store.set('editor.activeProfile', newName);
                this.store.set('editor.activeCategory', newProfile.categories[0]?.name || null);
            } else {
                const profile = newConfig.texts.find((p) => p.name === activeProfileName);
                if (!profile) return;

                const categories = profile.categories;
                const activeIndex = categories.findIndex((c) => c.name === activeCategoryName);
                if (activeIndex === -1) return;

                const sourceCategory = categories[activeIndex];
                const newName = proposeUniqueName(`${sourceCategory.name} Copy`, categories);

                const newCategory = deepClone(sourceCategory);
                newCategory.name = newName;

                categories.splice(activeIndex + 1, 0, newCategory);

                await this.callbacks.onSave(newConfig);
                this.cachedConfig = newConfig;

                this.store.set('editor.activeCategory', newName);
            }

            // Reload texts
            this._loadStateFromConfig(this.store.get('editor.activeProfile'), this.store.get('editor.activeCategory'));
        }

        /**
         * @private
         */
        async _handleItemDelete() {
            const itemType = this.store.get('editor.targetType');
            const keyToDelete = this.store.get('editor.targetKey'); // name

            if (!keyToDelete) {
                this._exitDeleteConfirmationMode();
                return;
            }

            const newConfig = deepClone(this.cachedConfig);

            if (itemType === 'profile') {
                const profiles = newConfig.texts;
                const indexToDelete = profiles.findIndex((p) => p.name === keyToDelete);

                if (indexToDelete !== -1) {
                    profiles.splice(indexToDelete, 1);

                    // Determine next profile to show
                    const nextIndex = Math.min(indexToDelete, profiles.length - 1);
                    const nextProfile = profiles[nextIndex] || profiles[0];
                    const nextViewKey = nextProfile?.name || null;

                    if (newConfig.options.activeProfileName === keyToDelete) {
                        newConfig.options.activeProfileName = nextViewKey;
                    }

                    await this.callbacks.onSave(newConfig);
                    this.cachedConfig = newConfig;

                    this.store.set('editor.activeProfile', nextViewKey);
                    this.store.set('editor.activeCategory', nextProfile?.categories[0]?.name || null);
                }
            } else {
                const activeProfileName = this.store.get('editor.activeProfile');
                const profile = newConfig.texts.find((p) => p.name === activeProfileName);

                if (profile) {
                    const categories = profile.categories;
                    const indexToDelete = categories.findIndex((c) => c.name === keyToDelete);

                    if (indexToDelete !== -1) {
                        categories.splice(indexToDelete, 1);

                        // Determine next category
                        const nextIndex = Math.min(indexToDelete, categories.length - 1);
                        const nextCategory = categories[nextIndex] || categories[0];
                        const nextViewKey = nextCategory?.name || null;

                        await this.callbacks.onSave(newConfig);
                        this.cachedConfig = newConfig;

                        this.store.set('editor.activeCategory', nextViewKey);
                    }
                }
            }

            // Reload texts
            this._loadStateFromConfig(this.store.get('editor.activeProfile'), this.store.get('editor.activeCategory'));

            this._exitDeleteConfirmationMode();
        }

        /**
         * @private
         * @param {'profile' | 'category'} itemType The type of item to move.
         * @param {number} direction The direction to move (-1 for up, 1 for down).
         */
        async _handleItemMove(itemType, direction) {
            const newConfig = deepClone(this.cachedConfig);
            const activeProfileName = this.store.get('editor.activeProfile');
            const activeCategoryName = this.store.get('editor.activeCategory');
            let targetArray;
            let activeKey;

            if (itemType === 'profile') {
                targetArray = newConfig.texts;
                activeKey = activeProfileName;
            } else {
                const profile = newConfig.texts.find((p) => p.name === activeProfileName);
                if (!profile) return;
                targetArray = profile.categories;
                activeKey = activeCategoryName;
            }

            const currentIndex = targetArray.findIndex((item) => item.name === activeKey);

            if (currentIndex === -1) return;
            const newIndex = currentIndex + direction;
            if (newIndex < 0 || newIndex >= targetArray.length) return;

            // Move using splice (Arrays maintain order correctly)
            const [movedItem] = targetArray.splice(currentIndex, 1);
            targetArray.splice(newIndex, 0, movedItem);

            await this.callbacks.onSave(newConfig);
            this.cachedConfig = newConfig;

            // Value hasn't changed, but trigger forced update for reordering UI
            this.store.set('editor.lastUpdated', Date.now());
        }

        async _handleSaveAction(shouldClose) {
            const footerMessage = this.modal?.dom?.footerMessage;
            if (footerMessage) {
                // Clear previous messages (unless it's a conflict warning)
                if (!footerMessage.classList.contains(this.commonStyleHandle.classes.conflictText)) {
                    footerMessage.textContent = '';
                    footerMessage.style.color = '';
                }
            }
            this.modal.element.querySelectorAll('.is-invalid').forEach((el) => el.classList.remove('is-invalid'));

            // 1. Validate
            const currentTexts = this.store.get('editor.currentTexts');
            const cls = this.styleHandle.classes;

            if (currentTexts.some((t) => t.trim() === '')) {
                // Mark invalid elements manually since we synced to store
                const scrollArea = this.modal.element.querySelector(`.${cls.scrollableArea}`);
                if (scrollArea) {
                    scrollArea.querySelectorAll('textarea').forEach((ta, i) => {
                        if (currentTexts[i].trim() === '') ta.classList.add('is-invalid');
                    });
                }
                if (footerMessage) {
                    footerMessage.textContent = 'Text fields cannot be empty.';
                    footerMessage.style.color = `var(${StyleDefinitions.VARS.TEXT_DANGER})`;
                }
                return;
            }

            // 2. Commit to Config
            this._saveCurrentStateToConfig();

            // 3. Save
            try {
                await this.callbacks.onSave(this.cachedConfig);
                this.cachedConfig = deepClone(this.cachedConfig); // Re-clone to be safe

                if (shouldClose) {
                    this.close();
                }
            } catch (e) {
                // Primary error handling is done via events (e.g. CONFIG_SIZE_EXCEEDED).
                // This catch block serves as a fallback for other unexpected errors.
                if (footerMessage) {
                    footerMessage.textContent = e.message;
                    footerMessage.style.color = `var(${StyleDefinitions.VARS.TEXT_DANGER})`;
                }
            }
        }

        _enterRenameMode(type) {
            const currentMode = this.store.get('editor.mode');
            if (currentMode === 'rename') return;

            this.store.set('editor.mode', 'rename');
            this.store.set('editor.targetType', type);

            // Set focus after UI update
            requestAnimationFrame(() => {
                if (this.modal) {
                    const input = this.modal.element.querySelector(`#${APPID}-${type}-rename-input`);
                    if (input) {
                        input.focus();
                        input.select();
                    }
                }
            });
        }

        async _handleRenameConfirm(type) {
            const footerMessage = this.modal?.dom?.footerMessage;
            const input = this.modal.element.querySelector(`#${APPID}-${type}-rename-input`);
            const newName = input.value.trim();
            const oldName = type === 'profile' ? this.store.get('editor.activeProfile') : this.store.get('editor.activeCategory');

            if (!newName) {
                if (footerMessage) {
                    footerMessage.textContent = `${type.charAt(0).toUpperCase() + type.slice(1)} name cannot be empty.`;
                    footerMessage.style.color = `var(${StyleDefinitions.VARS.TEXT_DANGER})`;
                }
                input.classList.add('is-invalid');
                return;
            }

            // Check for duplicates
            const config = this.cachedConfig;
            let itemsToCheck;
            if (type === 'profile') {
                itemsToCheck = config.texts;
            } else {
                const profile = config.texts.find((p) => p.name === this.store.get('editor.activeProfile'));
                itemsToCheck = profile ? profile.categories : [];
            }

            if (newName.toLowerCase() !== oldName.toLowerCase() && itemsToCheck.some((item) => item.name.toLowerCase() === newName.toLowerCase())) {
                if (footerMessage) {
                    footerMessage.textContent = `Name "${newName}" is already in use.`;
                    footerMessage.style.color = `var(${StyleDefinitions.VARS.TEXT_DANGER})`;
                }
                input.classList.add('is-invalid');
                return;
            }

            // Notify UIManager about the rename BEFORE saving to maintain session consistency
            if (this.callbacks.onRename) {
                const activeProfile = this.store.get('editor.activeProfile');
                this.callbacks.onRename(type, oldName, newName, activeProfile);
            }

            const newConfig = deepClone(config);

            if (type === 'profile') {
                const profile = newConfig.texts.find((p) => p.name === oldName);
                if (profile) {
                    profile.name = newName; // Simply update the property
                }

                // Update activeProfileName option if needed
                if (config.options.activeProfileName === oldName) {
                    newConfig.options.activeProfileName = newName;
                }

                await this.callbacks.onSave(newConfig);
                this.cachedConfig = newConfig;

                this.store.set('editor.activeProfile', newName);
            } else {
                const activeProfileName = this.store.get('editor.activeProfile');
                const profile = newConfig.texts.find((p) => p.name === activeProfileName);
                if (profile) {
                    const category = profile.categories.find((c) => c.name === oldName);
                    if (category) {
                        category.name = newName; // Simply update the property
                    }
                }

                await this.callbacks.onSave(newConfig);
                this.cachedConfig = newConfig;

                this.store.set('editor.activeCategory', newName);
            }

            this._exitRenameMode(true);
        }

        getContextForReopen() {
            const activeCategory = this.store ? this.store.get('editor.activeCategory') : null;
            return { type: CONSTANTS.MODAL_TYPES.TEXT_EDITOR, key: activeCategory };
        }
    }

    /**
     * Manages the JSON editing modal by using the CustomModal component.
     */
    class JsonModalComponent extends UIComponentBase {
        constructor(callbacks) {
            super(callbacks);
            this.modal = null; // To hold the CustomModal instance
            this.store = null;
            this.engine = null;
            this.styleHandle = null;
            this.commonStyleHandle = null;
            this.debouncedUpdateSize = debounce((text) => this._updateSizeDisplay(text), 300, true);
        }

        render() {
            this.styleHandle = StyleManager.request(StyleDefinitions.getJsonModal);
            this.commonStyleHandle = StyleManager.request(StyleDefinitions.getCommon);
        }

        async open(anchorElement) {
            if (this.modal || this.isOpening) return; // Prevent re-entry
            this.callbacks.onModalOpenStateChange?.(true);

            // Ensure styles are ready
            if (!this.styleHandle) this.render();

            this.isOpening = true;

            try {
                const cls = this.styleHandle.classes;
                const commonCls = this.commonStyleHandle.classes;

                this.modal = new CustomModal({
                    title: `${APPNAME} Settings`,
                    width: 'min(440px, 95vw)',
                    closeOnBackdropClick: true,
                    buttons: [
                        { text: 'Export', id: `${APPID}-json-modal-export-btn`, className: '', onClick: () => this._handleExport() },
                        { text: 'Import', id: `${APPID}-json-modal-import-btn`, className: '', onClick: () => this._handleImport() },
                        { text: 'Cancel', id: `${APPID}-json-modal-cancel-btn`, className: commonCls.pushRightBtn, onClick: () => this.close() },
                        { text: 'Save', id: `${APPID}-json-modal-save-btn`, className: commonCls.primaryBtn, onClick: () => this._handleSave() },
                    ],
                    onDestroy: () => {
                        this.debouncedUpdateSize.cancel();
                        this.callbacks.onModalOpenStateChange?.(false);
                        this.engine?.destroy();
                        this.engine = null;
                        this.store = null;
                        this.modal = null;
                    },
                });

                // Apply scoped root class to prevent style leak
                this.modal.element.classList.add(cls.modalRoot);

                // Set content specific styles using mapped class names
                const contentContainer = this.modal.getContentContainer();
                contentContainer.classList.add(cls.statusContainer); // Use container class for padding/layout if needed

                this.store = new ReactiveStore({
                    json: {
                        editor: '',
                        status: { text: '' },
                        sizeInfo: { text: 'Checking size...' },
                    },
                });

                const context = {
                    styles: { ...commonCls, ...cls }, // Merge styles for FormEngine
                    store: this.store,
                };

                this.engine = new FormEngine(this.store, this._getSchema(), context);
                this.modal.setContent(this.engine.render());

                this.callbacks.onModalOpen?.(); // Notify UIManager

                const config = await this.callbacks.getCurrentConfig();
                const initialText = JSON.stringify(config, null, 2);
                this.store.set('json.editor', initialText);
                this._updateSizeDisplay(initialText);

                this.modal.show(anchorElement);

                // Defer focus and scroll adjustment until the modal is visible
                requestAnimationFrame(() => {
                    const textarea = this.modal.getContentContainer().querySelector(`textarea`);
                    if (!textarea) return;
                    textarea.focus();
                    textarea.scrollTop = 0;
                    textarea.selectionStart = 0;
                    textarea.selectionEnd = 0;
                });
            } finally {
                this.isOpening = false;
            }
        }

        close() {
            if (this.modal) {
                this.modal.close();
            }
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            this.debouncedUpdateSize.cancel();
            this.engine?.destroy();
            this.engine = null;
            this.store = null;
            this.modal?.destroy();
            super._onDestroy();
        }

        _getSchema() {
            // Note: Schema uses logical class names mapped in StyleDefinitions
            return [
                SchemaBuilder.Container(
                    [
                        SchemaBuilder.CodeEditor('json.editor', {
                            onChange: (value) => this.debouncedUpdateSize(value || ''),
                        }),
                        SchemaBuilder.Row(
                            [
                                SchemaBuilder.TextDisplay('json.status', { className: 'msg' }), // Mapped to cls.msg
                                SchemaBuilder.TextDisplay('json.sizeInfo', { className: 'sizeInfo' }), // Mapped to cls.sizeInfo
                            ],
                            {
                                className: 'statusRow', // Mapped to cls.statusRow
                            }
                        ),
                    ],
                    { className: 'content' } // Mapped to cls.content
                ),
            ];
        }

        async _handleSave() {
            try {
                this._setStatus('');
                const jsonText = this.store?.get('json.editor') || '';
                const obj = JSON.parse(jsonText);
                await this.callbacks.onSave(obj);
                this.close();
            } catch (e) {
                this._setStatus(e.message, `var(${StyleDefinitions.VARS.TEXT_DANGER})`);
            }
        }

        async _handleExport() {
            try {
                this._setStatus('');

                const config = await this.callbacks.getCurrentConfig();
                const jsonString = JSON.stringify(config, null, 2);
                const blob = new Blob([jsonString], { type: 'application/json' });
                const url = URL.createObjectURL(blob);
                const a = h('a', {
                    href: url,
                    download: `${APPID}_config.json`,
                });

                if (a instanceof HTMLElement) {
                    a.click();
                }

                // Revoke the URL after a delay to ensure the download has time to start.
                setTimeout(() => URL.revokeObjectURL(url), 10000);
                this._setStatus('Export successful.', `var(${StyleDefinitions.VARS.TEXT_ACCENT})`);
            } catch (e) {
                this._setStatus(`Export failed: ${e.message}`, `var(${StyleDefinitions.VARS.TEXT_DANGER})`);
            }
        }

        _handleImport() {
            const textarea = this.modal.getContentContainer().querySelector(`textarea`);
            if (!(textarea instanceof HTMLTextAreaElement)) return;

            const fileInput = h('input', {
                type: 'file',
                accept: 'application/json',
                onchange: (event) => {
                    const target = event.target;
                    if (!(target instanceof HTMLInputElement)) return;

                    const file = target.files?.[0];
                    // Reset input value to allow re-importing the same file if needed
                    target.value = '';

                    if (!file) return;

                    const reader = new FileReader();

                    // Step 1: Update UI immediately upon load completion
                    reader.onload = (e) => {
                        this._setStatus('Processing...');
                        document.body.style.cursor = 'wait';

                        // Step 2: Defer heavy processing to allow UI to render
                        requestAnimationFrame(() => {
                            // Guard: Check if modal is still open before proceeding
                            if (!this.modal || !textarea.isConnected) {
                                document.body.style.cursor = '';
                                return;
                            }

                            try {
                                const readerTarget = e.target;
                                if (readerTarget && typeof readerTarget.result === 'string') {
                                    // Heavy operations
                                    const importedConfig = JSON.parse(readerTarget.result);
                                    const jsonString = JSON.stringify(importedConfig, null, 2);

                                    this.store?.set('json.editor', jsonString);
                                    this._updateSizeDisplay(jsonString);

                                    this._setStatus('Import successful. Click "Save" to apply.', `var(${StyleDefinitions.VARS.TEXT_ACCENT})`);
                                }
                            } catch (err) {
                                this._setStatus(`Import failed: ${err.message}`, `var(${StyleDefinitions.VARS.TEXT_DANGER})`);
                            } finally {
                                document.body.style.cursor = '';
                            }
                        });
                    };

                    reader.onerror = () => {
                        this._setStatus('Failed to read file.', `var(${StyleDefinitions.VARS.TEXT_DANGER})`);
                    };

                    // Initial status
                    this._setStatus('Reading file...');
                    reader.readAsText(file);
                },
            });

            if (fileInput instanceof HTMLElement) {
                fileInput.click();
            }
        }

        getContextForReopen() {
            return { type: 'json' };
        }

        _updateSizeDisplay(text) {
            const container = this.modal?.getContentContainer();
            if (!container) return;

            let sizeInBytes = 0;
            let isRaw = false;

            try {
                // Try to parse and minify to get the actual storage size
                const obj = JSON.parse(text);
                const minified = JSON.stringify(obj);
                sizeInBytes = new Blob([minified]).size;
            } catch {
                // Fallback to raw text size if parsing fails
                sizeInBytes = new Blob([text]).size;
                isRaw = true;
            }

            const sizeStr = this._formatBytes(sizeInBytes);
            const recommendedStr = this._formatBytes(CONSTANTS.CONFIG_SIZE_RECOMMENDED_LIMIT_BYTES);
            const limitStr = this._formatBytes(CONSTANTS.CONFIG_SIZE_LIMIT_BYTES);

            // Display format: 1.23 MB / 5.00 MB (Max: 10.00 MB)
            let color = '';
            let bold = false;
            const v = StyleDefinitions.VARS;

            // Use colors directly or vars
            if (sizeInBytes >= CONSTANTS.CONFIG_SIZE_LIMIT_BYTES) {
                color = `var(${v.TEXT_DANGER})`;
                bold = true;
            } else if (sizeInBytes >= CONSTANTS.CONFIG_SIZE_RECOMMENDED_LIMIT_BYTES) {
                color = `var(${v.TEXT_WARNING})`;
                bold = true;
            }
            const sizeText = `${isRaw ? '(Raw) ' : ''}${sizeStr} / ${recommendedStr} (Max: ${limitStr})`;
            this.store?.set('json.sizeInfo', {
                text: sizeText,
                color,
                bold,
                title: `Recommended Limit: ${recommendedStr} (Warns if exceeded)\nHard Limit: ${limitStr} (Cannot save if exceeded)`,
            });
        }

        _setStatus(text, color = '') {
            this.store?.set('json.status', { text, color, bold: false });
        }

        _formatBytes(bytes) {
            if (bytes === 0) return '0 B';
            const k = 1024;
            const sizes = ['B', 'KB', 'MB'];
            const i = Math.floor(Math.log(bytes) / Math.log(k));
            return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
        }
    }

    /**
     * Manages the Shortcut Cheat Sheet modal.
     */
    class ShortcutModalComponent extends UIComponentBase {
        constructor(callbacks) {
            super(callbacks);
            this.modal = null;
            this.styleHandle = null;
        }

        render() {
            this.styleHandle = StyleManager.request(StyleDefinitions.getShortcutModal);
        }

        open(anchorElement) {
            if (this.modal) return; // Prevent re-entry

            // Ensure styles are ready
            if (!this.styleHandle) this.render();

            const cls = this.styleHandle.classes;
            const commonCls = StyleManager.request(StyleDefinitions.getCommon).classes;

            this.modal = new CustomModal({
                title: `${APPNAME} Keyboard Shortcuts`,
                width: 'min(400px, 95vw)',
                closeOnBackdropClick: true,
                buttons: [{ text: 'Close', id: `${APPID}-shortcut-close-btn`, className: commonCls.primaryBtn, onClick: () => this.close() }],
                onDestroy: () => {
                    this.modal = null;
                },
            });

            // Helper to create grid rows
            const createRow = (keys, desc, separator = ' + ') => {
                const keyElements = keys
                    .map((k, i) => {
                        const els = [h(`span.${cls.key}`, k)];
                        if (i < keys.length - 1) els.push(h('span', separator));
                        return els;
                    })
                    .flat();

                return [h(`div.${cls.keyGroup}`, keyElements), h(`div.${cls.desc}`, desc)];
            };

            const createHeader = (text) => h(`div.${cls.sectionHeader}`, text);

            const content = h(`div.${cls.grid}`, [
                createHeader('Global'),
                ...createRow(['Alt', 'Q'], 'Toggle Text List (If enabled)'),

                createHeader('Navigation'),
                ...createRow(['↑ / ↓'], 'Select Item'),
                ...createRow(['← / →'], 'Switch Category'),
                ...createRow(['Ctrl', '← / →'], 'Switch Profile'),
                ...createRow(['Ctrl', '↑ / ↓'], 'Toggle Profile List'),

                createHeader('Action'),
                ...createRow(['Enter', 'Space', 'Tab'], 'Select item', ' / '),
                ...createRow(['Esc'], 'Close Text List'),
            ]);

            this.modal.setContent(content);
            this.modal.show();
        }

        close() {
            this.modal?.close();
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            this.close();
            super._onDestroy();
        }
    }

    class InsertButtonComponent extends UIComponentBase {
        constructor(callbacks, options) {
            super(callbacks);
            this.options = options;
            this.styleHandle = null;
        }

        /**
         * Updates the button's title (tooltip) dynamically.
         * @param {string} title The new title text.
         */
        setTitle(title) {
            this.options.title = title;
            if (this.element) {
                this.element.title = title;
            }
        }

        /**
         * Renders the settings button element and appends it to the document body.
         * @returns {HTMLElement} The created button element.
         */
        render() {
            // Use StyleManager
            this.styleHandle = StyleManager.request(StyleDefinitions.getInsertButton);
            const cls = this.styleHandle.classes;

            // Remove existing if any (safety check)
            const oldElement = document.getElementById(cls.buttonId);
            if (oldElement) oldElement.remove();

            this.element = h('button', {
                type: 'button',
                id: cls.buttonId,
                title: this.options.title,
                // Prevent focus loss from the input area
                onmousedown: (e) => e.preventDefault(),
                // Restore event handlers directly on the element
                onclick: (e) => {
                    e.stopPropagation();
                    this.callbacks.onClick?.(e);
                },
                oncontextmenu: (e) => {
                    e.preventDefault();
                    e.stopPropagation();
                    this.callbacks.onContextMenu?.(e);
                },
                onmouseenter: (e) => this.callbacks.onMouseEnter?.(e),
                onmouseleave: (e) => this.callbacks.onMouseLeave?.(e),
            });

            // Retrieve icon definition from unified definition
            const iconDef = StyleDefinitions.ICONS.insert;
            if (iconDef) {
                const svgElement = createIconFromDef(iconDef);
                if (svgElement) {
                    this.element.appendChild(svgElement);
                }
            }

            return this.element;
        }
    }

    class TextListComponent extends UIComponentBase {
        constructor(callbacks, options) {
            super(callbacks);
            this.options = options;
            this.styleHandle = null;
            this.elements = {
                tabsContainer: null,
                optionsContainer: null,
            };
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            super._onDestroy();
        }

        /**
         * @private
         * Retrieves the current list of option buttons.
         * @returns {HTMLElement[]}
         */
        _getOptions() {
            if (!this.elements.optionsContainer) return [];
            // Use the class name from the style handle
            const cls = this.styleHandle.classes;
            // Convert to Array to satisfy return type and allow array methods
            return Array.from(this.elements.optionsContainer.querySelectorAll(`.${cls.option}`));
        }

        /**
         * Focuses the option at the specified index.
         * @param {number} index
         */
        focusOption(index) {
            const options = this._getOptions();
            if (options.length === 0) return;

            // Clamp index
            let targetIndex = index;
            if (targetIndex < 0) targetIndex = 0;
            if (targetIndex >= options.length) targetIndex = options.length - 1;

            options[targetIndex].focus();
        }

        /**
         * Focuses the next option in the list. Loops to start if at end.
         */
        focusNext() {
            const options = this._getOptions();
            if (options.length === 0) return;

            const current = document.activeElement;
            const currentIndex = current instanceof HTMLElement ? options.indexOf(current) : -1;

            // If focus is not on an option, start from -1 so next is 0
            let nextIndex = currentIndex + 1;
            if (nextIndex >= options.length) nextIndex = 0;

            options[nextIndex].focus();
        }

        /**
         * Focuses the previous option in the list. Loops to end if at start.
         */
        focusPrev() {
            const options = this._getOptions();
            if (options.length === 0) return;

            const current = document.activeElement;
            // If focus is not on an option, start from length (so prev is length-1)
            let currentIndex = current instanceof HTMLElement ? options.indexOf(current) : -1;
            if (currentIndex === -1) currentIndex = 0;

            let prevIndex = currentIndex - 1;
            if (prevIndex < 0) prevIndex = options.length - 1;

            options[prevIndex].focus();
        }

        render() {
            this.styleHandle = StyleManager.request(StyleDefinitions.getTextList);
            const cls = this.styleHandle.classes;

            // Retrieve icon definitions from StyleDefinitions
            // Reuse "up" icon for navigation arrows by rotating via CSS classes
            const upIcon = StyleDefinitions.ICONS.up;

            // Create profile bar
            const profileBar = h(`div.${cls.profileBar}`, [
                // Previous button (Left arrow: upIcon rotated -90 degrees)
                (this.elements.prevBtn = h(
                    `button.${cls.navBtn}.${cls.rotateLeft}`,
                    {
                        title: 'Previous Profile',
                        onclick: (e) => {
                            e.stopPropagation(); // Stop propagation to prevent list from closing
                            this.callbacks.onPrevProfile?.();
                        },
                    },
                    [createIconFromDef(upIcon)]
                )),
                // Next button (Right arrow: upIcon rotated 90 degrees)
                (this.elements.nextBtn = h(
                    `button.${cls.navBtn}.${cls.rotateRight}`,
                    {
                        title: 'Next Profile',
                        onclick: (e) => {
                            e.stopPropagation(); // Stop propagation to prevent list from closing
                            this.callbacks.onNextProfile?.();
                        },
                    },
                    [createIconFromDef(upIcon)]
                )),
                // Profile name display area
                (this.elements.profileName = h(`span.${cls.profileName}`, {
                    title: 'Current Profile (Click to switch / Right-Click to edit)',
                    onclick: (e) => {
                        e.stopPropagation();
                        this.callbacks.onProfileNameClick?.();
                    },
                    oncontextmenu: (e) => {
                        e.preventDefault();
                        e.stopPropagation();
                        this.callbacks.onProfileNameContextMenu?.();
                    },
                })),
            ]);

            this.element = h(
                `div#${cls.list}`,
                {
                    style: { display: 'none' },
                    onmouseenter: (e) => this.callbacks.onMouseEnter?.(e),
                    onmouseleave: (e) => this.callbacks.onMouseLeave?.(e),
                    onmousemove: (e) => this.callbacks.onMouseMove?.(e),
                },
                [
                    profileBar,
                    (this.elements.tabsContainer = h(`div.${cls.tabs}`)),
                    (this.elements.separator = h(`div.${cls.separator}`)), // Store reference
                    (this.elements.optionsContainer = h(`div.${cls.options}`)),
                ]
            );

            document.body.appendChild(this.element);
            return this.element;
        }

        /**
         * Updates the profile name displayed in the header.
         * @param {string} name
         */
        setProfileName(name) {
            if (this.elements.profileName) {
                this.elements.profileName.textContent = name;
            }
        }

        /**
         * Toggles the visibility of category tabs and separator.
         * @param {boolean} visible
         */
        toggleTabs(visible) {
            const display = visible ? '' : 'none';
            if (this.elements.tabsContainer) this.elements.tabsContainer.style.display = display;
            if (this.elements.separator) this.elements.separator.style.display = display;
        }
    }

    class UIManager extends BaseManager {
        /** * @param {object} config
         * @param {(config: object) => Promise<void>} onSave
         * @param {object} platformDetails
         * @param {() => void} onModalClose
         * @param {(config: object) => {isValid: boolean, message: string|null}} checkConfigSizeCallback
         */
        constructor(config, onSave, platformDetails, onModalClose, checkConfigSizeCallback) {
            super();
            this.config = config;
            this.onSave = onSave;
            this.platformDetails = platformDetails;
            this.onModalClose = onModalClose;

            // Flag for requestAnimationFrame throttling
            this.isRepositioningScheduled = false;

            // State flag for input mode
            this.isKeyboardNavigating = false;

            // Initialize Session State (Array-based access)
            const profiles = this.config.texts || [];
            this.sessionActiveProfile = this.config.options.activeProfileName || profiles[0]?.name;

            const activeProfile = profiles.find((p) => p.name === this.sessionActiveProfile) || profiles[0];
            // Update sessionActiveProfile in case the configured one was missing
            if (activeProfile) {
                this.sessionActiveProfile = activeProfile.name;
            }

            const categories = activeProfile ? activeProfile.categories : [];
            this.activeCategory = categories[0]?.name || null;

            this.hideTimeoutId = null;
            this.isModalOpen = false;
            this.isProfileListMode = false;
            this.lastFocusedIndex = 0; // Remember last position for UX

            this._handlers = {
                globalClick: this._handleGlobalClick.bind(this),
                globalKeydown: this._handleGlobalKeydown.bind(this),
            };

            this.components = {
                settingsPanel: null,
                insertBtn: null,
                textList: null,
                textEditorModal: null,
                jsonModal: null,
                shortcutModal: null,
            };

            const modalCallbacks = {
                onSave: (newConfig) => this.onSave(newConfig),
                getCurrentConfig: () => this.config,
                onModalOpenStateChange: (isOpen) => this.setModalState(isOpen),
                checkConfigSize: checkConfigSizeCallback, // Pass validator to modals
                // Handle renaming to maintain session consistency
                onRename: (type, oldName, newName, parentContext) => {
                    if (type === 'profile') {
                        if (this.sessionActiveProfile === oldName) {
                            this.sessionActiveProfile = newName;
                        }
                    } else if (type === 'category') {
                        if (this.sessionActiveProfile === parentContext && this.activeCategory === oldName) {
                            this.activeCategory = newName;
                        }
                    }
                },
            };

            // Initialize Settings Panel first to reference it in InsertButton callbacks
            this.components.settingsPanel = new SettingsPanelComponent({
                onSave: (newConfig) => this.onSave(newConfig),
                getCurrentConfig: () => this.config,
                // Anchor to insertBtn (will be assigned later, but reference is dynamic)
                getAnchorElement: () => this.components.insertBtn.element,
                // Pass only session profile
                onShowTextEditorModal: () => this.components.textEditorModal.open(this.sessionActiveProfile),
                onShowJsonModal: () => {
                    this.components.jsonModal.open(this.components.insertBtn.element);
                },
                onShowShortcutModal: () => {
                    this.components.shortcutModal.open(this.components.insertBtn.element);
                },
            });

            this.components.insertBtn = new InsertButtonComponent(
                {
                    onClick: (e) => {
                        const mode = this.config.options.trigger_mode || 'hover';

                        if (this.components.settingsPanel.isOpen()) {
                            this.components.settingsPanel.hide();
                            this._showTextList(false);
                            return;
                        }

                        if (mode === 'click') {
                            if (this.components.textList.element.style.display === 'none') {
                                this._showTextList(false);
                            } else {
                                this._hideTextList();
                            }
                        } else {
                            this._hideTextList();
                            this.components.settingsPanel.show();
                        }
                    },
                    onContextMenu: (e) => {
                        this._hideTextList();
                        this.components.settingsPanel.toggle();
                    },
                    onMouseEnter: () => {
                        const mode = this.config.options.trigger_mode || 'hover';
                        if (mode === 'hover' && !this.components.settingsPanel.isOpen()) {
                            this._showTextList(false);
                        }
                    },
                    onMouseLeave: () => {
                        const mode = this.config.options.trigger_mode || 'hover';
                        if (mode !== 'click') {
                            this._startHideTimer();
                        }
                    },
                },
                {
                    id: `${CONSTANTS.ID_PREFIX}insert-btn`,
                    title: 'Add quick text',
                }
            );

            this.components.textList = new TextListComponent(
                {
                    onMouseEnter: () => clearTimeout(this.hideTimeoutId),
                    onMouseLeave: () => {
                        const mode = this.config.options.trigger_mode || 'hover';
                        if (mode !== 'click') {
                            this._startHideTimer();
                        }
                    },
                    onMouseMove: (e) => {
                        if (this.isKeyboardNavigating) {
                            // Check if mouse actually moved to prevent unexpected blur on layout changes
                            if (e.movementX === 0 && e.movementY === 0) return;

                            this.isKeyboardNavigating = false;

                            // Remove focus from the list item to clear selection visual
                            if (document.activeElement instanceof HTMLElement && this.components.textList.element.contains(document.activeElement)) {
                                document.activeElement.blur();
                            }
                        }
                    },
                    onPrevProfile: () => this._switchProfile(-1),
                    onNextProfile: () => this._switchProfile(1),
                    onProfileNameClick: () => this.toggleProfileList(),
                    onProfileNameContextMenu: () => {
                        this._hideTextList();
                        this.components.textEditorModal.open(this.sessionActiveProfile);
                    },
                },
                {
                    id: `${CONSTANTS.ID_PREFIX}text-list`,
                }
            );

            this.components.jsonModal = new JsonModalComponent(modalCallbacks);
            this.components.textEditorModal = new TextEditorModalComponent({
                ...modalCallbacks,
                onShowJsonModal: () => {
                    this.components.textEditorModal.close();
                    this.components.jsonModal.open(this.components.insertBtn.element);
                },
            });
            this.components.shortcutModal = new ShortcutModalComponent(modalCallbacks);
        }

        async _onInit() {
            // Explicitly render components that require it
            this.components.insertBtn?.render();
            this.components.textList?.render();
            this.components.settingsPanel?.render();
            this.components.textEditorModal?.render();
            this.components.jsonModal?.render();
            this.components.shortcutModal?.render();

            this.renderContent();
            this._updateButtonTitle();

            this._subscribe(EVENTS.REOPEN_MODAL, ({ type, key }) => {
                if (type === CONSTANTS.MODAL_TYPES.JSON) {
                    this.components.jsonModal.open(this.components.insertBtn.element);
                } else if (type === CONSTANTS.MODAL_TYPES.TEXT_EDITOR) {
                    this.components.textEditorModal.open(this.sessionActiveProfile, key);
                }
            });

            this._subscribe(EVENTS.UI_REPOSITION, () => this.repositionInsertButton());

            this._subscribe(EVENTS.NAVIGATION_START, () => {
                this.components.settingsPanel.hide();
                this._hideTextList();
            });

            this.repositionInsertButton();

            // Register global key listener for shortcuts (Alt+Q)
            document.addEventListener('keydown', this._handlers.globalKeydown);

            if (this.components.settingsPanel) {
                await this.components.settingsPanel.init();
            }
            if (this.components.textEditorModal) {
                await this.components.textEditorModal.init();
            }
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            this._hideTextList();
            clearTimeout(this.hideTimeoutId);

            // Remove global listeners
            document.removeEventListener('keydown', this._handlers.globalKeydown);
            document.removeEventListener('click', this._handlers.globalClick); // Ensure click listener is also removed

            for (const key in this.components) {
                this.components[key]?.destroy();
            }
            super._onDestroy();
        }

        repositionInsertButton() {
            if (this.isRepositioningScheduled) return;

            this.isRepositioningScheduled = true;
            requestAnimationFrame(() => {
                PlatformAdapters.UI.repositionInsertButton(this.components.insertBtn);
                this.isRepositioningScheduled = false;
            });
        }

        getActiveModal() {
            if (this.components.jsonModal?.modal?.element?.open) {
                return this.components.jsonModal;
            }
            if (this.components.textEditorModal?.modal?.element?.open) {
                return this.components.textEditorModal;
            }
            return null;
        }

        setModalState(isOpen) {
            this.isModalOpen = isOpen;
            if (!isOpen) {
                this.onModalClose?.();
            }
        }

        toggleProfileList() {
            this.isProfileListMode = !this.isProfileListMode;
            if (this.isProfileListMode) {
                this.renderProfileList();
            } else {
                this.renderContent();
            }
        }

        renderProfileList() {
            if (!this.components.textList) return;

            this.components.textList.toggleTabs(false);

            const { optionsContainer } = this.components.textList.elements;
            optionsContainer.textContent = '';

            // Array-based access
            const profiles = this.config.texts || [];
            const activeProfileName = this.sessionActiveProfile;

            // Retrieve class names from StyleDefinitions
            const cls = StyleDefinitions.getTextList().classes;

            profiles.forEach((profile) => {
                const profileName = profile.name;
                const btn = h('button', {
                    className: `${cls.option}` + (profileName === activeProfileName ? ' active' : ''),
                    textContent: profileName,
                    title: 'Switch to this profile',
                    onclick: (e) => {
                        e.preventDefault();
                        e.stopPropagation();
                        this._setProfile(profileName);

                        // Only focus if navigating via keyboard
                        if (this.isKeyboardNavigating) {
                            requestAnimationFrame(() => this.components.textList.focusOption(0));
                        }
                    },
                });
                optionsContainer.appendChild(btn);
            });

            optionsContainer.scrollTop = 0;
        }

        updateConfig(newConfig) {
            this.config = newConfig;

            // Array-based validation
            const profiles = this.config.texts || [];
            const activeProfileObj = profiles.find((p) => p.name === this.sessionActiveProfile);

            if (!activeProfileObj) {
                Logger.warn('STATE RECOVERY', LOG_STYLES.ORANGE, `Session profile "${this.sessionActiveProfile}" no longer exists. Falling back to default.`);
                const fallbackProfile = profiles[0];
                this.sessionActiveProfile = this.config.options.activeProfileName || fallbackProfile?.name;

                const activeProfile = profiles.find((p) => p.name === this.sessionActiveProfile) || fallbackProfile;
                this.activeCategory = activeProfile?.categories[0]?.name || null;
            } else {
                const categories = activeProfileObj.categories;
                const categoryExists = categories.some((c) => c.name === this.activeCategory);
                if (this.activeCategory && !categoryExists) {
                    this.activeCategory = categories[0]?.name || null;
                }
            }

            this.renderContent();
            this._updateButtonTitle();
        }

        renderContent() {
            if (!this.components.textList) return;

            this.isProfileListMode = false;
            this.components.textList.toggleTabs(true);

            const { tabsContainer, optionsContainer } = this.components.textList.elements;
            tabsContainer.textContent = '';
            optionsContainer.textContent = '';

            const activeProfileName = this.sessionActiveProfile;
            const profiles = this.config.texts || [];
            const activeProfile = profiles.find((p) => p.name === activeProfileName);

            if (!activeProfile) {
                Logger.warn('', '', `Active profile "${activeProfileName}" not found.`);
                return;
            }

            this.components.textList.setProfileName(activeProfileName);

            // Retrieve class names from StyleDefinitions
            const cls = StyleDefinitions.getTextList().classes;
            const categories = activeProfile.categories || [];

            categories.forEach((cat) => {
                const catName = cat.name;
                const tab = h('button', {
                    className: `${cls.tab}` + (catName === this.activeCategory ? ' active' : ''),
                    textContent: catName,
                    onclick: (e) => {
                        e.preventDefault();
                        e.stopPropagation();
                        this.activeCategory = catName;
                        this.renderContent();

                        // Only focus if navigating via keyboard
                        if (this.isKeyboardNavigating) {
                            requestAnimationFrame(() => this.components.textList.focusOption(0));
                        }
                    },
                });
                tabsContainer.appendChild(tab);
            });

            // Find active category object
            const activeCategoryObj = categories.find((c) => c.name === this.activeCategory);
            const items = activeCategoryObj ? activeCategoryObj.items : [];

            items.forEach((txt) => {
                const btn = h('button', {
                    className: `${cls.option}`,
                    textContent: txt,
                    title: txt,
                    onclick: (e) => {
                        e.preventDefault();
                        e.stopPropagation();
                        this._insertText(txt);
                        this._hideTextList();
                    },
                });
                optionsContainer.appendChild(btn);
            });
        }

        async _switchCategory(direction) {
            const profiles = this.config.texts || [];
            const activeProfile = profiles.find((p) => p.name === this.sessionActiveProfile);
            if (!activeProfile) return;

            const categories = activeProfile.categories || [];
            if (categories.length <= 1) return;

            const currentIndex = categories.findIndex((c) => c.name === this.activeCategory);
            // Fallback if not found
            const baseIndex = currentIndex === -1 ? 0 : currentIndex;

            let newIndex = (baseIndex + direction) % categories.length;
            if (newIndex < 0) newIndex += categories.length;

            const newCategory = categories[newIndex];
            this.activeCategory = newCategory.name;

            this.renderContent();

            // Reset focus to the first item in the new category
            requestAnimationFrame(() => this.components.textList.focusOption(0));
        }

        async _switchProfile(direction) {
            const profiles = this.config.texts || [];
            if (profiles.length <= 1) return;

            const currentProfileIndex = profiles.findIndex((p) => p.name === this.sessionActiveProfile);
            // Fallback if not found
            const baseIndex = currentProfileIndex === -1 ? 0 : currentProfileIndex;

            let newIndex = (baseIndex + direction) % profiles.length;
            if (newIndex < 0) newIndex += profiles.length;

            const newProfile = profiles[newIndex];
            this.sessionActiveProfile = newProfile.name;
            this.activeCategory = newProfile.categories[0]?.name || null;

            this.renderContent();

            if (this.components.textList.elements.optionsContainer) {
                this.components.textList.elements.optionsContainer.scrollTop = 0;
            }
        }

        async _setProfile(profileName) {
            if (profileName === this.sessionActiveProfile) {
                this.renderContent();
                return;
            }

            this.sessionActiveProfile = profileName;

            const profiles = this.config.texts || [];
            const activeProfile = profiles.find((p) => p.name === profileName);

            this.activeCategory = activeProfile?.categories[0]?.name || null;

            this.renderContent();

            if (this.components.textList.elements.optionsContainer) {
                this.components.textList.elements.optionsContainer.scrollTop = 0;
            }
        }

        _updateButtonTitle() {
            if (!this.components.insertBtn) return;
            const mode = this.config.options.trigger_mode || 'hover';
            const shortcutSuffix = this.config.options.enable_shortcut ? ' (Alt+Q)' : '';

            let title;
            if (mode === 'click') {
                title = `Click to open Text List${shortcutSuffix} / Right-click to open Settings`;
            } else {
                title = `Hover to open Text List${shortcutSuffix} / Click to open Settings`;
            }
            this.components.insertBtn.setTitle(title);
        }

        _insertText(text) {
            PlatformAdapters.General.insertText(text, this.config.options);
        }

        _positionList() {
            requestAnimationFrame(() => {
                const btnRect = this.components.insertBtn.element.getBoundingClientRect();
                const listElem = this.components.textList.element;
                const margin = 8;
                const gap = 4;

                const spaceAbove = btnRect.top - margin - gap;
                const spaceBelow = window.innerHeight - btnRect.bottom - margin - gap;

                const placeOnTop = spaceAbove >= 200 || spaceAbove >= spaceBelow;

                if (placeOnTop) {
                    listElem.style.flexDirection = 'column-reverse';
                    listElem.style.top = 'auto';
                    listElem.style.bottom = `${window.innerHeight - btnRect.top + gap}px`;
                    listElem.style.maxHeight = `${spaceAbove}px`;
                } else {
                    listElem.style.flexDirection = 'column';
                    listElem.style.bottom = 'auto';
                    listElem.style.top = `${btnRect.bottom + gap}px`;
                    listElem.style.maxHeight = `${spaceBelow}px`;
                }

                const listWidth = listElem.offsetWidth || 500;
                let left = btnRect.left;
                if (left + listWidth > window.innerWidth - margin) {
                    left = window.innerWidth - listWidth - margin;
                }
                left = Math.max(left, margin);
                listElem.style.left = `${left}px`;

                listElem.style.opacity = '1';
            });
        }

        _showTextList(isKeyboard) {
            clearTimeout(this.hideTimeoutId);
            const listElem = this.components.textList.element;

            if (listElem.style.display !== 'none') return;

            // Set navigation mode flag based on trigger source
            this.isKeyboardNavigating = isKeyboard;

            listElem.style.display = 'flex';
            listElem.style.opacity = '0';
            listElem.style.left = '-9999px';
            listElem.style.top = '';
            listElem.style.bottom = '';

            this._positionList();

            // Setup global click listener for closing (only when open)
            document.addEventListener('click', this._handlers.globalClick);

            // Restore focus (Native Focus Management)
            if (isKeyboard) {
                requestAnimationFrame(() => {
                    if (this.isProfileListMode) {
                        this.components.textList.focusOption(0);
                    } else {
                        this.components.textList.focusOption(this.lastFocusedIndex);
                    }
                });
            }
        }

        _startHideTimer() {
            this.hideTimeoutId = setTimeout(() => {
                this._hideTextList();
            }, CONSTANTS.TIMING.TIMEOUTS.HIDE_DELAY_MS);
        }

        _hideTextList() {
            clearTimeout(this.hideTimeoutId);

            const listElem = this.components.textList.element;
            if (listElem.style.display === 'none') return;

            // Remember focus index if not in profile list mode
            if (!this.isProfileListMode) {
                const options = this.components.textList._getOptions();
                const current = document.activeElement;
                const index = current instanceof HTMLElement ? options.indexOf(current) : -1;
                if (index >= 0) {
                    this.lastFocusedIndex = index;
                }
            }

            listElem.style.display = 'none';

            // Remove global click listener (Keydown listener remains active)
            document.removeEventListener('click', this._handlers.globalClick);

            if (this.isProfileListMode) {
                this.renderContent(); // Reset to text content view
            }

            // UX: Restore focus to the input editor
            const editorSelector = this.platformDetails.selectors.INPUT_TARGET;
            const editor = document.querySelector(editorSelector);
            if (editor instanceof HTMLElement) {
                editor.focus();
            }
        }

        _handleGlobalClick(e) {
            const listEl = this.components.textList.element;
            const btnEl = this.components.insertBtn.element;

            // If closed, do nothing (though listener should be removed)
            if (listEl.style.display === 'none') return;

            // Ignore clicks inside the list or on the toggle button
            if (listEl.contains(e.target) || btnEl.contains(e.target)) {
                return;
            }

            this._hideTextList();
        }

        /**
         * Checks if any modal or settings panel is currently open.
         * @returns {boolean}
         * @private
         */
        _isAnyModalOpen() {
            // Check Settings Panel
            if (this.components.settingsPanel && this.components.settingsPanel.isOpen()) {
                return true;
            }

            // Check Dialog Modals
            const modals = [this.components.textEditorModal, this.components.jsonModal, this.components.shortcutModal];

            return modals.some((comp) => comp?.modal?.element?.open);
        }

        _handleGlobalKeydown(e) {
            // 1. Global Toggle (Alt+Q)
            // Use code 'KeyQ' for physical key position independence, or 'q' key property.
            // Exclude AltGr (Ctrl+Alt) to avoid accidental trigger on some keyboard layouts
            const isAltGraph = e.getModifierState ? e.getModifierState('AltGraph') : false;

            if (e.altKey && !e.ctrlKey && !e.metaKey && !isAltGraph && (e.code === 'KeyQ' || e.key === 'q')) {
                // Check if shortcut is enabled
                if (this.config.options.enable_shortcut === false) {
                    return;
                }

                // If any modal/panel is open, ignore the shortcut completely
                if (this._isAnyModalOpen()) {
                    return;
                }

                e.preventDefault();
                e.stopPropagation();

                if (this.components.textList.element.style.display === 'none') {
                    this._showTextList(true);
                } else {
                    this._hideTextList();
                }
                return;
            }

            // If list is closed, stop processing navigation keys
            if (this.components.textList.element.style.display === 'none') return;

            // Prevent interference with IME composition (e.g., when focus logic fails and focus remains on input)
            if (e.isComposing) return;

            // Close list on character input
            // Consume the event so no character is entered, then close the list.
            // Note: Space key is excluded here because it is handled explicitly in the switch statement below.
            const isCharKey = !e.ctrlKey && !e.altKey && !e.metaKey && e.key.length === 1 && e.key !== ' ';
            if (isCharKey) {
                e.preventDefault();
                e.stopPropagation();
                this._hideTextList();
                return;
            }

            // 2. Navigation when List is Open
            const isProfileList = this.isProfileListMode;

            // Update navigation mode to keyboard
            if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight'].includes(e.key)) {
                this.isKeyboardNavigating = true;
            }

            switch (e.key) {
                case 'Escape':
                    e.preventDefault();
                    e.stopPropagation();
                    this._hideTextList();
                    break;

                case 'ArrowUp':
                    e.preventDefault();
                    e.stopPropagation();
                    if (e.ctrlKey) {
                        // Ctrl+Up: Toggle Profile List
                        this.toggleProfileList();
                        if (this.isProfileListMode) {
                            requestAnimationFrame(() => this.components.textList.focusOption(0));
                        } else {
                            requestAnimationFrame(() => this.components.textList.focusOption(this.lastFocusedIndex));
                        }
                    } else {
                        // Normal Up: Previous Item
                        this.components.textList.focusPrev();
                    }
                    break;

                case 'ArrowDown':
                    e.preventDefault();
                    e.stopPropagation();
                    if (e.ctrlKey) {
                        // Ctrl+Down: Toggle Profile List
                        this.toggleProfileList();
                        if (this.isProfileListMode) {
                            requestAnimationFrame(() => this.components.textList.focusOption(0));
                        } else {
                            requestAnimationFrame(() => this.components.textList.focusOption(this.lastFocusedIndex));
                        }
                    } else {
                        // Normal Down: Next Item
                        this.components.textList.focusNext();
                    }
                    break;

                case 'ArrowLeft':
                    e.preventDefault();
                    e.stopPropagation();
                    if (e.ctrlKey) {
                        // Ctrl+Left: Switch Profile
                        if (!isProfileList) {
                            this._switchProfile(-1).then(() => {
                                // Reset focus to first item after switch
                                requestAnimationFrame(() => this.components.textList.focusOption(0));
                            });
                        }
                    } else {
                        // Normal Left: Switch Category (New Feature)
                        if (!isProfileList) {
                            this._switchCategory(-1);
                        }
                    }
                    break;

                case 'ArrowRight':
                    e.preventDefault();
                    e.stopPropagation();
                    if (e.ctrlKey) {
                        // Ctrl+Right: Switch Profile
                        if (!isProfileList) {
                            this._switchProfile(1).then(() => {
                                // Reset focus to first item after switch
                                requestAnimationFrame(() => this.components.textList.focusOption(0));
                            });
                        }
                    } else {
                        // Normal Right: Switch Category
                        if (!isProfileList) {
                            this._switchCategory(1);
                        }
                    }
                    break;

                case 'Tab':
                case ' ':
                case 'Enter':
                    e.preventDefault();
                    e.stopPropagation();
                    if (document.activeElement instanceof HTMLElement && this.components.textList.element.contains(document.activeElement)) {
                        document.activeElement.click();
                    } else {
                        // Handle selection via mouse hover if no element is focused
                        const cls = StyleManager.request(StyleDefinitions.getTextList).classes;
                        const hoverOption = this.components.textList.element.querySelector(`.${cls.option}:hover`);
                        if (hoverOption instanceof HTMLElement) {
                            hoverOption.click();
                        } else {
                            this._hideTextList();
                        }
                    }
                    break;
            }
        }
    }

    // =================================================================================
    // SECTION: Sync Manager
    // =================================================================================

    class SyncManager extends BaseManager {
        constructor(appInstance) {
            super();
            this.app = appInstance;
            this.pendingRemoteConfig = null;
            this.remoteChangeListenerId = null;
        }

        _onInit() {
            this.remoteChangeListenerId = GM_addValueChangeListener(this.app.configKey, async (name, oldValue, newValue, remote) => {
                if (remote) {
                    await this._handleRemoteChange(newValue);
                }
            });
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            if (this.remoteChangeListenerId !== null) {
                GM_removeValueChangeListener(this.remoteChangeListenerId);
                this.remoteChangeListenerId = null;
            }
            super._onDestroy();
        }

        onModalClose() {
            if (this.pendingRemoteConfig) {
                Logger.log('', '', 'SyncManager: Modal closed with a pending update. Applying it now.');
                this.app.applyUpdate(this.pendingRemoteConfig);
                this.pendingRemoteConfig = null;
            }
        }

        onSave() {
            // A local save overwrites any pending remote changes.
            this.pendingRemoteConfig = null;
            // Also, clear any visible conflict notifications.
            const activeModal = this.app.uiManager.getActiveModal?.();
            if (activeModal) {
                this._clearConflictNotification(activeModal);
            }
        }

        async _handleRemoteChange(rawValue) {
            Logger.info('SYNC', LOG_STYLES.TEAL, 'SyncManager: Remote config change detected.');
            try {
                const newConfig = await this.app.configManager.decode(rawValue);
                const activeModal = this.app.uiManager.getActiveModal?.();

                if (activeModal) {
                    Logger.info('SYNC', LOG_STYLES.TEAL, 'SyncManager: A modal is open. Storing update and displaying conflict notification.');
                    this.pendingRemoteConfig = newConfig;
                    this._showConflictNotification(activeModal);
                } else {
                    Logger.info('SYNC', LOG_STYLES.TEAL, 'SyncManager: No modal open. Applying silent update.');
                    this.app.applyUpdate(newConfig);
                }
            } catch (e) {
                Logger.error('SYNC ERROR', LOG_STYLES.RED, 'SyncManager: Failed to handle remote config change:', e);
            }
        }

        _showConflictNotification(modalComponent) {
            if (!modalComponent?.modal) return;
            this._clearConflictNotification(modalComponent); // Clear previous state first

            const messageArea = modalComponent.modal.dom.footerMessage;
            const cls = StyleDefinitions.COMMON_CLASSES;
            const v = StyleDefinitions.VARS;

            if (messageArea) {
                const messageText = h('span', {
                    textContent: 'Settings updated in another tab.',
                    style: { display: 'flex', alignItems: 'center' },
                });
                const reloadBtn = h('button', {
                    id: cls.conflictReloadBtnId,
                    className: cls.modalButton,
                    textContent: 'Reload UI',
                    title: 'Discard local changes and load the settings from the other tab.',
                    style: {
                        borderColor: `var(${v.TEXT_DANGER})`,
                        marginLeft: '12px',
                    },
                    onclick: () => {
                        const reopenContext = modalComponent.getContextForReopen?.();
                        modalComponent.close();
                        // onModalClose will handle applying the pending update.
                        // Request to reopen the modal after a short delay to ensure sync completion.
                        setTimeout(() => {
                            EventBus.publish(EVENTS.REOPEN_MODAL, reopenContext);
                        }, 100);
                    },
                });
                messageArea.textContent = '';
                messageArea.classList.add(cls.conflictText);
                messageArea.append(messageText, reloadBtn);
            }
        }

        _clearConflictNotification(modalComponent) {
            if (!modalComponent?.modal) return;
            const messageArea = modalComponent.modal.dom.footerMessage;
            if (messageArea) {
                messageArea.textContent = '';
                messageArea.classList.remove(StyleDefinitions.COMMON_CLASSES.conflictText);
            }
        }
    }

    // =================================================================================
    // SECTION: Navigation Monitor
    // Description: Centralizes URL change detection via history API hooks and popstate events.
    // =================================================================================

    class NavigationMonitor {
        constructor() {
            this.originalHistoryMethods = { pushState: null, replaceState: null };
            this._historyWrappers = {};
            this.isInitialized = false;
            this.lastPath = null;
            this._handlePopState = this._handlePopState.bind(this);

            // Debounce the navigation event to allow the DOM to settle and prevent duplicate events
            this.debouncedNavigation = debounce(
                () => {
                    EventBus.publish(EVENTS.NAVIGATION);
                },
                CONSTANTS.TIMING.TIMEOUTS.POST_NAVIGATION_DOM_SETTLE,
                true
            );
        }

        init() {
            if (this.isInitialized) return;
            this.isInitialized = true;
            // Capture initial path
            this.lastPath = location.pathname + location.search;
            this._hookHistory();
            window.addEventListener('popstate', this._handlePopState);
        }

        destroy() {
            if (!this.isInitialized) return;
            this._restoreHistory();
            window.removeEventListener('popstate', this._handlePopState);
            this.debouncedNavigation.cancel();
            this.isInitialized = false;
        }

        _hookHistory() {
            // Capture the instance for use in the wrapper
            const instance = this;

            for (const m of ['pushState', 'replaceState']) {
                const orig = history[m];
                this.originalHistoryMethods[m] = orig;

                const wrapper = function (...args) {
                    const result = orig.apply(this, args);
                    instance._onUrlChange();
                    return result;
                };

                this._historyWrappers[m] = wrapper;
                history[m] = wrapper;
            }
        }

        _restoreHistory() {
            for (const m of ['pushState', 'replaceState']) {
                if (this.originalHistoryMethods[m]) {
                    if (history[m] === this._historyWrappers[m]) {
                        history[m] = this.originalHistoryMethods[m];
                    } else {
                        Logger.warn('HISTORY HOOK', LOG_STYLES.YELLOW, `history.${m} has been wrapped by another script. Skipping restoration to prevent breaking the chain.`);
                    }
                    this.originalHistoryMethods[m] = null;
                }
            }
            this._historyWrappers = {};
        }

        _handlePopState() {
            this._onUrlChange();
        }

        _onUrlChange() {
            const currentPath = location.pathname + location.search;

            // Prevent re-triggers if the path hasn't actually changed
            if (currentPath === this.lastPath) {
                return;
            }
            this.lastPath = currentPath;

            EventBus.publish(EVENTS.NAVIGATION_START);
            this.debouncedNavigation();
        }
    }

    // =================================================================================
    // SECTION: DOM Observers and Event Listeners
    // =================================================================================

    class ObserverManager extends BaseManager {
        constructor() {
            super();
            this.activePageObservers = []; // To store cleanup functions
        }

        /**
         * Starts all platform-specific observers by retrieving and executing them
         * from the PlatformAdapter.
         */
        start() {
            // Subscribe to navigation events to handle page changes
            this._subscribe(EVENTS.NAVIGATION, () => this._onNavigation());

            // Perform initial setup by publishing the navigation event.
            EventBus.publish(EVENTS.NAVIGATION);
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            this.activePageObservers.forEach((cleanup) => cleanup());
            this.activePageObservers = [];
            super._onDestroy();
        }

        /**
         * @private
         * @description Handles the logic required when a navigation occurs or the app initializes.
         * Resets observers and sets up page-specific listeners.
         */
        _onNavigation() {
            try {
                Logger.debug('NAVIGATOR', LOG_STYLES.CYAN, 'Navigation detected. Starting lifecycle...');

                // 1. Cleanup previous page resources
                this.activePageObservers.forEach((cleanup) => cleanup());
                this.activePageObservers = [];

                // 2. Initialize Page-Specific Observers
                const observerStarters = PlatformAdapters.Observer.getInitializers();
                for (const startObserver of observerStarters) {
                    // Ensure the context of 'this' is the ObserverManager instance
                    const cleanup = startObserver.call(this, {});
                    if (typeof cleanup === 'function') {
                        this.activePageObservers.push(cleanup);
                    }
                }
            } catch (e) {
                Logger.error('NAV_HANDLER_ERROR', LOG_STYLES.RED, 'Error during navigation handling:', e);
            }
        }
    }

    // =================================================================================
    // SECTION: Main Application Controller
    // =================================================================================

    /**
     * @class Sentinel
     * @description Detects DOM node insertion using a shared, prefixed CSS animation trick.
     * @property {Map<string, Array<(element: Element) => void>>} listeners
     * @property {Set<string>} rules
     * @property {HTMLElement | null} styleElement
     * @property {CSSStyleSheet | null} sheet
     * @property {string[]} pendingRules
     * @property {WeakMap<CSSRule, string>} ruleSelectors
     */
    class Sentinel {
        /**
         * @param {string} prefix - A unique identifier for this Sentinel instance to avoid CSS conflicts. Required.
         */
        constructor(prefix) {
            if (!prefix) {
                throw new Error('[Sentinel] "prefix" argument is required to avoid CSS conflicts.');
            }

            /** @type {any} */
            const globalScope = window;
            globalScope.__global_sentinel_instances__ = globalScope.__global_sentinel_instances__ || {};
            if (globalScope.__global_sentinel_instances__[prefix]) {
                return globalScope.__global_sentinel_instances__[prefix];
            }

            // Use a unique, prefixed animation name shared by all scripts in a project.
            this.animationName = `${prefix}-global-sentinel-animation`;
            this.styleId = `${prefix}-sentinel-global-rules`; // A single, unified style element
            this.listeners = new Map();
            this.rules = new Set(); // Tracks all active selectors
            this.styleElement = null; // Holds the reference to the single style element
            this.sheet = null; // Cache the CSSStyleSheet reference
            this.pendingRules = []; // Queue for rules requested before sheet is ready
            /** @type {WeakMap<CSSRule, string>} */
            this.ruleSelectors = new WeakMap(); // Tracks selector strings associated with CSSRule objects

            this._injectStyleElement();
            document.addEventListener('animationstart', this._handleAnimationStart.bind(this), true);

            globalScope.__global_sentinel_instances__[prefix] = this;
        }

        _injectStyleElement() {
            // Ensure the style element is injected only once per project prefix.
            this.styleElement = document.getElementById(this.styleId);

            if (this.styleElement instanceof HTMLStyleElement) {
                this.sheet = this.styleElement.sheet;
                return;
            }

            // Create empty style element
            this.styleElement = h('style', {
                id: this.styleId,
            });

            // CSP Fix: Try to fetch a valid nonce from existing scripts/styles
            // "nonce" property exists on HTMLScriptElement/HTMLStyleElement, not basic Element.
            let nonce;
            const script = document.querySelector('script[nonce]');
            const style = document.querySelector('style[nonce]');

            if (script instanceof HTMLScriptElement) {
                nonce = script.nonce;
            } else if (style instanceof HTMLStyleElement) {
                nonce = style.nonce;
            }

            if (nonce) {
                this.styleElement.setAttribute('nonce', nonce);
            }

            // Try to inject immediately. If the document is not yet ready (e.g. extremely early document-start), wait for the root element.
            const target = document.head || document.documentElement;

            const initSheet = () => {
                if (this.styleElement instanceof HTMLStyleElement) {
                    this.sheet = this.styleElement.sheet;
                    // Insert the shared keyframes rule at index 0.
                    try {
                        const keyframes = `@keyframes ${this.animationName} { from { transform: none; } to { transform: none; } }`;
                        this.sheet.insertRule(keyframes, 0);
                    } catch (e) {
                        Logger.error('SENTINEL', LOG_STYLES.RED, 'Failed to insert keyframes rule:', e);
                    }
                    this._flushPendingRules();
                }
            };

            if (target) {
                target.appendChild(this.styleElement);
                initSheet();
            } else {
                const observer = new MutationObserver(() => {
                    const retryTarget = document.head || document.documentElement;
                    if (retryTarget) {
                        observer.disconnect();
                        retryTarget.appendChild(this.styleElement);
                        initSheet();
                    }
                });
                observer.observe(document, { childList: true });
            }
        }

        _flushPendingRules() {
            if (!this.sheet || this.pendingRules.length === 0) return;

            const rulesToInsert = [...this.pendingRules];
            this.pendingRules = [];

            rulesToInsert.forEach((selector) => {
                this._insertRule(selector);
            });
        }

        /**
         * Helper to insert a single rule into the stylesheet
         * @param {string} selector
         */
        _insertRule(selector) {
            try {
                const index = this.sheet.cssRules.length;
                const ruleText = `${selector} { animation-duration: 0.001s; animation-name: ${this.animationName}; }`;
                this.sheet.insertRule(ruleText, index);

                // Associate the inserted rule with the selector via WeakMap for safer removal later.
                // This mimics sentinel.js behavior to handle index shifts and selector normalization.
                const insertedRule = this.sheet.cssRules[index];
                if (insertedRule) {
                    this.ruleSelectors.set(insertedRule, selector);
                }
            } catch (e) {
                Logger.error('SENTINEL', LOG_STYLES.RED, `Failed to insert rule for selector "${selector}":`, e);
            }
        }

        _handleAnimationStart(event) {
            // Check if the animation is the one we're listening for.
            if (event.animationName !== this.animationName) return;

            const target = event.target;
            if (!(target instanceof Element)) {
                return;
            }

            // Check if the target element matches any of this instance's selectors.
            for (const [selector, callbacks] of this.listeners.entries()) {
                if (target.matches(selector)) {
                    // Use a copy of the callbacks array in case a callback removes itself.
                    [...callbacks].forEach((cb) => cb(target));
                }
            }
        }

        /**
         * @param {string} selector
         * @param {(element: Element) => void} callback
         */
        on(selector, callback) {
            // Add callback to listeners
            if (!this.listeners.has(selector)) {
                this.listeners.set(selector, []);
            }
            this.listeners.get(selector).push(callback);

            // If selector is already registered in rules, do nothing
            if (this.rules.has(selector)) return;

            this.rules.add(selector);

            // Apply rule
            if (this.sheet) {
                this._insertRule(selector);
            } else {
                this.pendingRules.push(selector);
            }
        }

        /**
         * @param {string} selector
         * @param {(element: Element) => void} callback
         */
        off(selector, callback) {
            const callbacks = this.listeners.get(selector);
            if (!callbacks) return;

            const newCallbacks = callbacks.filter((cb) => cb !== callback);

            if (newCallbacks.length === callbacks.length) {
                return; // Callback not found, do nothing.
            }

            if (newCallbacks.length === 0) {
                // Remove listener and rule
                this.listeners.delete(selector);
                this.rules.delete(selector);

                if (this.sheet) {
                    // Iterate backwards to avoid index shifting issues during deletion
                    for (let i = this.sheet.cssRules.length - 1; i >= 0; i--) {
                        const rule = this.sheet.cssRules[i];
                        // Check for recorded selector via WeakMap or fallback to selectorText match
                        const recordedSelector = this.ruleSelectors.get(rule);

                        if (recordedSelector === selector || (rule instanceof CSSStyleRule && rule.selectorText === selector)) {
                            this.sheet.deleteRule(i);
                            // We assume one rule per selector, so we can break after deletion
                            break;
                        }
                    }
                }
            } else {
                this.listeners.set(selector, newCallbacks);
            }
        }

        suspend() {
            if (this.styleElement instanceof HTMLStyleElement) {
                this.styleElement.disabled = true;
            }
            Logger.debug('SENTINEL', LOG_STYLES.CYAN, 'Suspended.');
        }

        resume() {
            if (this.styleElement instanceof HTMLStyleElement) {
                this.styleElement.disabled = false;
            }
            Logger.debug('SENTINEL', LOG_STYLES.CYAN, 'Resumed.');
        }
    }

    // =================================================================================
    // SECTION: Core Functions
    // =================================================================================

    class AppController extends BaseManager {
        constructor(platformDetails) {
            super();
            this.configManager = null;
            this.uiManager = null;
            this.platformDetails = platformDetails;
            this.syncManager = null;
            this.observerManager = new ObserverManager();
        }

        async _onInit() {
            // Inject platform-specific CSS variables immediately
            StyleManager.injectPlatformVariables(this.platformDetails.platformId);

            this.configManager = new ConfigManager();
            await this.configManager.load();

            // Set logger level from config immediately after loading
            Logger.setLevel(this.configManager.get().developer.logger_level);

            this.syncManager = new SyncManager(this);

            this.uiManager = new UIManager(
                this.configManager.get(),
                (newConfig) => this.handleSave(newConfig),
                this.platformDetails,
                () => this.syncManager.onModalClose(),
                (conf) => this.configManager.validateConfigSize(conf) // Pass size validator
            );
            await this.uiManager.init();
            await this.syncManager.init();

            this.observerManager.init();
            this.observerManager.start();
        }

        /**
         * @override
         * @protected
         */
        _onDestroy() {
            // Do not destroy navigationMonitor to keep history hooks active for recovery
            this.uiManager?.destroy();
            this.observerManager?.destroy();
            this.configManager?.destroy();
            this.syncManager?.destroy();
            super._onDestroy();
            Logger.debug('SHUTDOWN', LOG_STYLES.GRAY, 'AppController destroyed (suspended).');
        }

        // Method required by the SyncManager's interface for silent updates
        applyUpdate(newConfig) {
            const completeConfig = ConfigProcessor.process(newConfig);
            this.configManager.config = completeConfig;
            this.uiManager.updateConfig(completeConfig);

            // Apply logger level immediately
            if (completeConfig.developer && completeConfig.developer.logger_level) {
                Logger.setLevel(completeConfig.developer.logger_level);
            }

            // Notify UI components (e.g., SettingsPanel) to update their state
            EventBus.publish(EVENTS.CONFIG_UPDATED, completeConfig);
        }

        // Method required by the SyncManager's interface
        getAppId() {
            return APPID;
        }

        // Getter required by the SyncManager's interface
        get configKey() {
            return CONSTANTS.CONFIG_KEY;
        }

        async handleSave(newConfig) {
            try {
                // 1. Save to storage (Validation and sanitization occur here)
                await this.configManager.save(newConfig);

                // 2. Retrieve the sanitized config from the manager
                // This ensures we are using the valid data that was actually saved.
                const savedConfig = this.configManager.get();

                // 3. Update the UI Manager with the new config
                this.uiManager.updateConfig(savedConfig);

                // 4. Apply the new logger level immediately
                if (savedConfig.developer && savedConfig.developer.logger_level) {
                    Logger.setLevel(savedConfig.developer.logger_level);
                }

                // 5. Notify UI components (e.g., SettingsPanel) to refresh their form values
                // This is critical if the save was triggered by one component but others need to stay in sync.
                EventBus.publish(EVENTS.CONFIG_UPDATED, savedConfig);

                // 6. Notify SyncManager of the successful save
                this.syncManager.onSave();
            } catch (err) {
                Logger.error('CONFIG', '', 'Failed to save config:', err);
                throw err; // Re-throw the error for the UI layer to catch
            }
        }
    }

    // =================================================================================
    // SECTION: Lifecycle Manager
    // Description: Centralizes application startup/shutdown logic.
    // =================================================================================

    class LifecycleManager extends BaseManager {
        constructor(platformDetails) {
            super();
            this.platformDetails = platformDetails;
            this.app = new AppController(platformDetails);
            this.navMonitor = new NavigationMonitor();
            this._boundUpdateState = this._updateState.bind(this);
        }

        /**
         * @protected
         * @override
         */
        _onInit() {
            // Start navigation monitoring
            this.navMonitor.init();

            // Trigger 1: DOM Detection
            sentinel.on(this.platformDetails.selectors.INPUT_TARGET, this._boundUpdateState);

            // Trigger 2: Navigation
            this._subscribe(EVENTS.NAVIGATION, this._boundUpdateState);

            // Initial check
            this._updateState();
        }

        /**
         * @protected
         * @override
         */
        _onDestroy() {
            // Stop navigation monitoring
            this.navMonitor.destroy();

            // Cleanup Sentinel listener
            sentinel.off(this.platformDetails.selectors.INPUT_TARGET, this._boundUpdateState);

            // Ensure AppController is destroyed
            if (this.app.isInitialized) {
                this.app.destroy();
            }
            super._onDestroy();
        }

        _updateState() {
            // 1. Check exclusion rules
            if (PlatformAdapters.General.isExcludedPage()) {
                Logger.info('SUSPENDED', LOG_STYLES.YELLOW, 'Excluded page detected. App suspended.');
                if (this.app.isInitialized) {
                    this.app.destroy();
                }
                return;
            }

            // 2. Try to launch if valid target exists
            if (!this.app.isInitialized) {
                const target = document.querySelector(this.platformDetails.selectors.INPUT_TARGET);
                if (target) {
                    this.app.init();
                }
            }
        }
    }

    // =================================================================================
    // SECTION: Entry Point
    // =================================================================================

    // Exit if already executed
    if (ExecutionGuard.hasExecuted()) return;
    ExecutionGuard.setExecuted();

    // Singleton instance for observing internal DOM node insertions.
    const sentinel = new Sentinel(OWNERID);

    // Main Execution
    const platformDetails = PlatformAdapters.General.getPlatformDetails();
    if (platformDetails) {
        const lifecycleManager = new LifecycleManager(platformDetails);
        lifecycleManager.init();
    }
})();