LingQ Addon

Provides custom LingQ layouts

当前为 2025-05-20 提交的版本,查看 最新版本

// ==UserScript==
// @name         LingQ Addon
// @description  Provides custom LingQ layouts
// @match        https://www.lingq.com/*/learn/*/web/reader/*
// @match        https://www.lingq.com/*/learn/*/web/library/course/*
// @exclude      https://www.lingq.com/*/learn/*/web/editor/*
// @version      5.8.1
// @grant       GM_setValue
// @grant       GM_getValue
// @namespace https://gf.qytechs.cn/users/1458847
// ==/UserScript==

(function () {
    "use strict";

    const storage = {
        get: (key, defaultValue) => {
            const value = GM_getValue(key);
            return value === undefined ? defaultValue : value;
        },
        set: (key, value) => GM_setValue(key, value)
    };

    const defaults = {
        styleType: "video",
        heightBig: 400,
        sentenceHeight: 400,
        widgetWidth: 400,
        fontSize: 1.1,
        lineHeight: 1.7,

        colorMode: "dark",
        darkColors: {
            fontColor: "#e0e0e0",
            lingqBackground: "rgba(109, 89, 44, 0.7)",
            lingqBorder: "rgba(254, 203, 72, 0.3)",
            lingqBorderLearned: "rgba(254, 203, 72, 0.5)",
            knownBackground: "rgba(37, 57, 82, 0.7)",
            knownBorder: "rgba(72, 154, 254, 0.5)",
            playingUnderline: "#ffffff"
        },
        whiteColors: {
            fontColor: "#000000",
            lingqBackground: "rgba(255, 200, 0, 0.4)",
            lingqBorder: "rgba(255, 200, 0, 0.3)",
            lingqBorderLearned: "rgba(255, 200, 0, 1)",
            knownBackground: "rgba(198, 223, 255, 0.7)",
            knownBorder: "rgba(0, 111, 255, 0.3)",
            playingUnderline: "#000000"
        },

        librarySortOption: 0,
        autoFinishing: false,

        chatWidget: false,
        llmProviderModel: "openai gpt-4.1-nano",
        llmApiKey: "",
        askSelected: false,

        tts: false,
        ttsApiKey: "",
        ttsVoice: "alloy",
        ttsWord: false,
        ttsSentence: false,

        shortcutVideoFullscreen: 'p',
        shortcutBackward5s: 'a',
        shortcutForward5s: 's',
        shortcutTTSPlay: 'w',
        shortcutTranslator: 'e',
        shortcutMakeKnown: 'd',
        shortcutDictionary: 'f',
        shortcutCopySelected: 'c',
        shortcutMeaningInput: '`',
        shortcutChatInput: 'q'
    };

    const settings = {
        styleType: storage.get("styleType", defaults.styleType),
        heightBig: storage.get("heightBig", defaults.heightBig),
        sentenceHeight: storage.get("sentenceHeight", defaults.sentenceHeight),
        widgetWidth: storage.get("widgetWidth", defaults.widgetWidth),
        fontSize: storage.get("fontSize", defaults.fontSize),
        lineHeight: storage.get("lineHeight", defaults.lineHeight),

        colorMode: storage.get("colorMode", defaults.colorMode),

        librarySortOption: storage.get("librarySortOption", defaults.librarySortOption),
        get autoFinishing() { return storage.get("autoFinishing", defaults.autoFinishing); },

        get chatWidget() { return storage.get("chatWidget", defaults.chatWidget); },
        get llmProviderModel() { return storage.get("llmProviderModel", defaults.llmProviderModel); },
        get llmApiKey() { return storage.get("llmApiKey", defaults.llmApiKey); },
        get askSelected() { return storage.get("askSelected", defaults.askSelected); },

        get tts() { return storage.get("tts", defaults.tts); },
        get ttsApiKey() { return storage.get("ttsApiKey", defaults.ttsApiKey); },
        get ttsVoice() { return storage.get("ttsVoice", defaults.ttsVoice); },
        get ttsWord() { return storage.get("ttsWord", defaults.ttsWord); },
        get ttsSentence() { return storage.get("ttsSentence", defaults.ttsSentence); },

        get shortcutVideoFullscreen() { return storage.get("shortcutVideoFullscreen", defaults.shortcutVideoFullscreen); },
        get shortcutBackward5s() { return storage.get("shortcutBackward5s", defaults.shortcutBackward5s); },
        get shortcutForward5s() { return storage.get("shortcutForward5s", defaults.shortcutForward5s); },
        get shortcutTTSPlay() { return storage.get("shortcutTTSPlay", defaults.shortcutTTSPlay); },
        get shortcutTranslator() { return storage.get("shortcutTranslator", defaults.shortcutTranslator); },
        get shortcutMakeKnown() { return storage.get("shortcutMakeKnown", defaults.shortcutMakeKnown); },
        get shortcutDictionary() { return storage.get("shortcutDictionary", defaults.shortcutDictionary); },
        get shortcutCopySelected() { return storage.get("shortcutCopySelected", defaults.shortcutCopySelected); },
        get shortcutMeaningInput() { return storage.get("shortcutMeaningInput", defaults.shortcutMeaningInput); },
        get shortcutChatInput() { return storage.get("shortcutChatInput", defaults.shortcutChatInput); }
    };

    const colorSettings = getColorSettings(settings.colorMode);

    let styleElement = null;

    function getColorSettings(colorMode) {
        const prefix = colorMode === "dark" ? "dark_" : "white_";
        const defaultColors = colorMode === "dark" ? defaults.darkColors : defaults.whiteColors;

        return {
            fontColor: storage.get(prefix + "fontColor", defaultColors.fontColor),
            lingqBackground: storage.get(prefix + "lingqBackground", defaultColors.lingqBackground),
            lingqBorder: storage.get(prefix + "lingqBorder", defaultColors.lingqBorder),
            lingqBorderLearned: storage.get(prefix + "lingqBorderLearned", defaultColors.lingqBorderLearned),
            knownBackground: storage.get(prefix + "knownBackground", defaultColors.knownBackground),
            knownBorder: storage.get(prefix + "knownBorder", defaultColors.knownBorder),
            playingUnderline: storage.get(prefix + "playingUnderline", defaultColors.playingUnderline)
        };
    }

    function createElement(tag, props = {}) {
        const element = document.createElement(tag);
        Object.entries(props).forEach(([key, value]) => {
            if (key === "style" && typeof value === "string") {
                element.style.cssText = value;
            } else if (key === "textContent") {
                element.textContent = value;
            } else {
                element[key] = value;
            }
        });
        return element;
    }

    function createSettingsPopup() {
        const popup = createElement("div", {id: "lingqAddonSettingsPopup"});

        // drag handle
        const dragHandle = createElement("div", {id: "lingqAddonSettingsDragHandle"});

        const dragHandleTitle = createElement("h3", {textContent: "LingQ Addon Settings"});
        dragHandle.appendChild(dragHandleTitle);

        // popup content
        const content = createElement("div", {style: `padding: 0 5px;`});
        const popupContentElement = generatePopupContent();
        content.appendChild(popupContentElement);

        popup.appendChild(dragHandle);
        popup.appendChild(content);

        return popup;
    }

    function generatePopupContent() {
        function addSelect(parent, id, labelText, options, selectedValue) {
            const container = createElement("div", {className: "popup-row"});
            container.appendChild(createElement("label", {htmlFor: id, textContent: labelText}));

            const select = createElement("select", {id});
            options.forEach(option => {
                select.appendChild(createElement("option", {value: option.value, textContent: option.text, selected: selectedValue === option.value}));
            });

            container.appendChild(select);
            parent.appendChild(container);
            return container;
        }

        function addSlider(parent, id, labelText, valueId, value, unit, min, max, step) {
            const container = createElement("div", {className: "popup-row"});

            const label = createElement("label", { htmlFor: id });
            label.appendChild(document.createTextNode(labelText + " "));
            label.appendChild(createElement("span", { id: valueId, textContent: value }));
            if (unit) label.appendChild(document.createTextNode(unit));

            container.appendChild(label);
            container.appendChild(createElement("input", {type: "range", id, min, max, step, value, style: "width: 100%;"}));

            parent.appendChild(container);
            return container;
        }

        function addColorPicker(parent, id, labelText, value) {
            const container = createElement("div", {className: "popup-row"});
            container.appendChild(createElement("label", {htmlFor: id + "Text", textContent: labelText}));

            const flexContainer = createElement("div", {style: "display: flex; align-items: center;"});
            flexContainer.appendChild(createElement("div", {id: id + "Picker", className: "color-picker" }));
            flexContainer.appendChild(createElement("input", {type: "text", id: id + "Text", value, style: "margin-left: 10px;", className: "popup-input"}));

            container.appendChild(flexContainer);
            parent.appendChild(container);
            return container;
        }

        function addCheckbox(parent, id, labelText, checked) {
            const container = createElement("div", {className: "popup-row"});
            const label = createElement("label", {htmlFor: id, textContent: labelText});
            const checkbox = createElement("input", {type: "checkbox", id, checked, style: "margin-left: 10px;"});

            label.style.display = "flex";
            label.style.alignItems = "center";
            container.appendChild(label);
            label.appendChild(checkbox);
            parent.appendChild(container);

            return container;
        }

        function addShortcutInput(parent, id, labelText, value) {
            const container = createElement("div", {className: "popup-row", style: "display: flex; justify-content: space-between;"});

            container.appendChild(createElement("label", {htmlFor: id, textContent: labelText}));

            const input = createElement("input", {
                type: "text",
                id,
                value,
                maxLength: 1, // Restrict to single character
                className: "popup-input",
                style: "width: 30px; text-transform: lowercase; flex-grow: unset; text-align: center;"
            });
            container.appendChild(input);
            parent.appendChild(container);
            return container;
        }

        const popupLayout = createElement("div");
        const columns = createElement("div", {style: "display: flex; flex-direction: row;"});

        const container1 = createElement("div", {style: "padding: 5px; width: 350px;"});

        addSelect(container1, "styleTypeSelector", "Layout Style:", [
            { value: "video", text: "Video" },
            { value: "video2", text: "Video2" },
            { value: "audio", text: "Audio" },
            { value: "off", text: "Off" }
        ], settings.styleType);

        const videoSettings = createElement("div", {
            id: "videoSettings",
            style: `${settings.styleType === "video" ? "" : "display: none"}`
        });
        addSlider(videoSettings, "heightBigSlider", "Video Height:", "heightBigValue", settings.heightBig, "px", 300, 800, 10);
        container1.appendChild(videoSettings);

        const sentenceVideoSettings = createElement("div", {
            id: "sentenceVideoSettings",
            style: `${settings.styleType === "off" ? "" : "display: none"}`
        });
        addSlider(sentenceVideoSettings, "sentenceHeightSlider", "Sentence Video Height:", "sentenceHeightValue", settings.sentenceHeight, "px", 300, 600, 10);
        container1.appendChild(sentenceVideoSettings);

        addSlider(container1, "widgetWidthSlider", "Widget Width:", "widgetWidthValue", settings.widgetWidth, "px", 300, 500, 10);

        addSlider(container1, "fontSizeSlider", "Font Size:", "fontSizeValue", settings.fontSize, "rem", 0.8, 1.8, 0.05);
        addSlider(container1, "lineHeightSlider", "Line Height:", "lineHeightValue", settings.lineHeight, "", 1.2, 3.0, 0.1);

        const colorSection = createElement("div", {className: "popup-section"});

        addSelect(colorSection, "colorModeSelector", "Color Mode:", [
            { value: "dark", text: "Dark" },
            { value: "white", text: "White" }
        ], settings.colorMode);

        [
            { id: "fontColor", label: "Font Color:", value: colorSettings.fontColor },
            { id: "lingqBackground", label: "LingQ Background:", value: colorSettings.lingqBackground },
            { id: "lingqBorder", label: "LingQ Border:", value: colorSettings.lingqBorder },
            { id: "lingqBorderLearned", label: "LingQ Border Learned:", value: colorSettings.lingqBorderLearned },
            { id: "knownBackground", label: "Known Background:", value: colorSettings.knownBackground },
            { id: "knownBorder", label: "Known Border:", value: colorSettings.knownBorder },
            { id: "playingUnderline", label: "Playing Underline:", value: colorSettings.playingUnderline }
        ].forEach(config => addColorPicker(colorSection, config.id, config.label, config.value));

        container1.appendChild(colorSection);

        addCheckbox(container1, "autoFinishingCheckbox", "Finish Lesson Automatically", settings.autoFinishing);

        columns.appendChild(container1);

        const container2 = createElement("div", {style: "padding: 10px; width: 350px;"});

        const shortcutSection = createElement("div", {className: "popup-section"});

        shortcutSection.appendChild(createElement("h4", {textContent: "Keyboard Shortcuts"}));
        addShortcutInput(shortcutSection, "shortcutVideoFullscreenInput", "Video Fullscreen Toggle:", settings.shortcutVideoFullscreen);
        addShortcutInput(shortcutSection, "shortcutBackward5sInput", "5 Sec Backward:", settings.shortcutBackward5s);
        addShortcutInput(shortcutSection, "shortcutForward5sInput", "5 Sec Forward:", settings.shortcutForward5s);
        addShortcutInput(shortcutSection, "shortcutTTSPlayInput", "Play TTS Audio:", settings.shortcutTTSPlay);
        addShortcutInput(shortcutSection, "shortcutTranslatorOpenInput", "Open Translator:", settings.shortcutTranslator);
        addShortcutInput(shortcutSection, "shortcutMakeKnownInput", "Make Word Known:", settings.shortcutMakeKnown);
        addShortcutInput(shortcutSection, "shortcutDictionaryOpenInput", "Open Dictionary:", settings.shortcutDictionary);
        addShortcutInput(shortcutSection, "shortcutCopySelectedInput", "Copy Selected Text:", settings.shortcutCopySelected);
        addShortcutInput(shortcutSection, "shortcutMeaningInputInput", "Meaning Input Focus:", settings.shortcutMeaningInput);
        addShortcutInput(shortcutSection, "shortcutChatInputInput", "Chat Input Focus:", settings.shortcutChatInput);

        container2.appendChild(shortcutSection);

        addCheckbox(container2, "chatWidgetCheckbox", "Enable the Chat Widget", settings.chatWidget);

        const chatWidgetSection = createElement("div", {id: "chatWidgetSection", className: "popup-section", style: `${settings.chatWidget ? "" : "display: none"}`});

        addSelect(chatWidgetSection, "llmProviderModelSelector", "LLM Provider: (Price per 1M tokens)", [
            { value: "openai gpt-4.1-mini", text: "OpenAI GPT-4.1 mini ($0.4/$1.6)" },
            { value: "openai gpt-4.1-nano", text: "OpenAI GPT-4.1 nano ($0.1/$0.4)" },
            { value: "google gemini-2.5-flash-preview-04-17", text: "Google Gemini 2.5 Flash ($0.15/$0.6)" },
            { value: "google gemini-2.0-flash", text: "Google Gemini 2.0 Flash ($0.1/$0.4)" }
        ], settings.llmProviderModel);

        const apiKeyContainer = createElement("div", {className: "popup-row"});
        apiKeyContainer.appendChild(createElement("label", {htmlFor: "llmApiKeyInput", textContent: "API Key:"}));

        const apiKeyFlexContainer = createElement("div", {style: "display: flex; align-items: center;"});
        const apiKeyInput= createElement("input", {type: "password", id: "llmApiKeyInput", value: settings.llmApiKey, className: "popup-input"});
        apiKeyFlexContainer.appendChild(apiKeyInput)
        apiKeyContainer.appendChild(apiKeyFlexContainer);
        chatWidgetSection.appendChild(apiKeyContainer);

        addCheckbox(chatWidgetSection, "askSelectedCheckbox", "Enable asking with selected text", settings.askSelected);

        container2.appendChild(chatWidgetSection);

        addCheckbox(container2, "ttsCheckbox", "Enable AI-TTS", settings.tts);

        const ttsSection = createElement("div", {id: "ttsSection", className: "popup-section", style: `${settings.tts ? "" : "display: none"}`});

        const ttsApiKeyContainer = createElement("div", {className: "popup-row"});
        ttsApiKeyContainer.appendChild(createElement("label", {htmlFor: "ttsApiKeyInput", textContent: "OpenAI API Key:"}));

        const ttsApiKeyFlexContainer = createElement("div", {style: "display: flex; align-items: center;"});
        const ttsApiKeyInput= createElement("input", {type: "password", id: "ttsApiKeyInput", value: settings.ttsApiKey, className: "popup-input"});
        ttsApiKeyFlexContainer.appendChild(ttsApiKeyInput)
        ttsApiKeyContainer.appendChild(ttsApiKeyFlexContainer);
        ttsSection.appendChild(ttsApiKeyContainer);

        addSelect(ttsSection, "ttsVoiceSelector", "TTS Voice:", [
            { value: "alloy", text: "alloy" },
            { value: "ash", text: "ash" },
            { value: "ballad", text: "ballad" },
            { value: "coral", text: "coral" },
            { value: "echo", text: "onyx" },
            { value: "fable", text: "onyx" },
            { value: "onyx", text: "onyx" },
            { value: "nova", text: "nova" },
            { value: "sage", text: "sage" },
            { value: "shimmer", text: "onyx" },
            { value: "verse", text: "verse" },
        ], settings.ttsVoice);

        addCheckbox(ttsSection, "ttsWordCheckbox", "Enable AI-TTS for words", settings.ttsWord);
        addCheckbox(ttsSection, "ttsSentenceCheckbox", "Enable AI-TTS for sentences", settings.ttsSentence);

        container2.appendChild(ttsSection);

        columns.appendChild(container2);

        const buttonContainer = createElement("div", {style: "display: flex; justify-content: space-between;", className: "popup-row"});
        [
            {id: "resetSettingsBtn", textContent: "Reset", className: "popup-button"},
            {id: "closeSettingsBtn", textContent: "Close", className: "popup-button"}
        ].forEach((prop) => {
            buttonContainer.appendChild(createElement("button", prop));
        });

        popupLayout.appendChild(columns)
        popupLayout.appendChild(buttonContainer);
        return popupLayout;
    }

    function createDownloadWordsPopup() {
        const popup = createElement("div", {id: "lingqDownloadWordsPopup"});

        // drag handle
        const dragHandle = createElement("div", {id: "lingqDownloadWordsDragHandle"});

        const dragHandleTitle = createElement("h3", {textContent: "Download Words"});
        dragHandle.appendChild(dragHandleTitle);

        const content = createElement("div", {style: `padding: 0 10px;`});

        [
            {id: "downloadUnknownLingqsBtn", textContent: "Download Unknown LingQs (words + phrases)", className: "popup-button"},
            {id: "downloadUnknownLingqWordsBtn", textContent: "Download Unknown LingQ Words (1, 2, 3, 4)", className: "popup-button"},
            {id: "downloadUnknownLingqPhrasesBtn", textContent: "Download Unknown LingQ Phrases (1, 2, 3, 4)", className: "popup-button"},
            {id: "downloadKnownLingqsBtn", textContent: "Download Known LingQs (✓)", className: "popup-button"},
            {id: "downloadKnownWordsBtn", textContent: "Download Known Words ", className: "popup-button"}
        ].forEach((prop) => {
            let rowContainer = createElement("div", {className: "popup-row"});
            rowContainer.appendChild(createElement("button", prop))
            content.appendChild(rowContainer);
        });

        // Progress Bar Elements
        const progressContainer = createElement("div", {id: "downloadProgressContainer", className: "popup-row"});
        const progressText = createElement("div", {id: "downloadProgressText"});
        const progressBar = createElement("progress", {id: "downloadProgressBar", value: "0", max: "100"});

        progressContainer.appendChild(progressText);
        progressContainer.appendChild(progressBar);
        content.appendChild(progressContainer);

        const buttonContainer = createElement("div", {style: "display: flex; justify-content: flex-end;", className: "popup-row"});
        const closeButton = createElement("button", {id: "closeDownloadWordsBtn", textContent: "Close", className: "popup-button"});
        buttonContainer.appendChild(closeButton);
        content.appendChild(buttonContainer);

        popup.appendChild(dragHandle);
        popup.appendChild(content);

        return popup;
    }

    function createUI() {
        // Create settings button
        const settingsButton = createElement("button", {
            id: "lingqAddonSettings",
            textContent: "⚙️",
            title: "LingQ Addon Settings",
            className: "nav-button"
        });

        // Create lesson complete button
        const completeLessonButton = createElement("button", {
            id: "lingqLessonComplete",
            textContent: "✔",
            title: "Complete Lesson Button",
            className: "nav-button"
        });

        // Create download words button
        const downloadWordsButton = createElement("button", {
            id: "lingqDownloadWords",
            textContent: "💾",
            title: "Download Words",
            className: "nav-button"
        });

        // Find the #main-nav element
        let mainNav = document.querySelector("#main-nav > nav > div:nth-child(2) > div:nth-child(1)");

        if (mainNav) {
            mainNav.appendChild(settingsButton);
            mainNav.appendChild(downloadWordsButton);
            mainNav.appendChild(completeLessonButton);
        } else {
            console.error("#main-nav element not found. Buttons not inserted.");
        }

        // Create settings popup
        const settingsPopup = createSettingsPopup();
        document.body.appendChild(settingsPopup);

        // Create download words popup
        const downloadWordsPopup = createDownloadWordsPopup();
        document.body.appendChild(downloadWordsPopup);

        // Add event listeners
        setupSettingEventListeners(settingsButton, settingsPopup);
        setupDownloadWordsEventListeners(downloadWordsButton, downloadWordsPopup);
        setupEventListeners()
    }

    function makeDraggable(element, handle) {
        let pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;

        if (handle) {
            handle.onmousedown = dragMouseDown;
        } else {
            element.onmousedown = dragMouseDown;
        }

        function dragMouseDown(e) {
            e = e || window.event;
            e.preventDefault();

            if (element.style.transform && element.style.transform.includes('translate')) {
                const rect = element.getBoundingClientRect();

                element.style.transform = 'none';
                element.style.top = rect.top + 'px';
                element.style.left = rect.left + 'px';
            }

            pos3 = e.clientX;
            pos4 = e.clientY;
            document.onmouseup = closeDragElement;
            document.onmousemove = elementDrag;
        }

        function elementDrag(e) {
            e = e || window.event;
            e.preventDefault();

            pos1 = pos3 - e.clientX;
            pos2 = pos4 - e.clientY;
            pos3 = e.clientX;
            pos4 = e.clientY;

            element.style.top = (element.offsetTop - pos2) + "px";
            element.style.left = (element.offsetLeft - pos1) + "px";
        }

        function closeDragElement() {
            document.onmouseup = null;
            document.onmousemove = null;
        }
    }

    function setupSettingEventListeners(settingsButton, settingsPopup) {
        function initializePickrs() {
            function setupRGBAPickr(pickerId, textId, settingKey, cssVar) {
                function saveColorSetting(key, value) {
                    const currentColorMode = document.getElementById("colorModeSelector").value;
                    const prefix = currentColorMode === "dark" ? "dark_" : "white_";
                    storage.set(prefix + key, value);
                }

                const pickerElement = document.getElementById(pickerId);
                const textElement = document.getElementById(textId);

                if (!pickerElement || !textElement) return;

                pickerElement.style.backgroundColor = textElement.value;

                const pickr = Pickr.create({
                    el: pickerElement,
                    theme: 'nano',
                    useAsButton: true,
                    default: textElement.value,
                    components: {preview: true, opacity: true, hue: true}
                });

                pickr.on('change', (color) => {
                    const rgbaColor = color.toRGBA();

                    const r = Math.round(rgbaColor[0]);
                    const g = Math.round(rgbaColor[1]);
                    const b = Math.round(rgbaColor[2]);
                    const a = rgbaColor[3];

                    const roundedRGBA = `rgba(${r}, ${g}, ${b}, ${a})`;

                    textElement.value = roundedRGBA;
                    pickerElement.style.backgroundColor = roundedRGBA;
                    document.documentElement.style.setProperty(cssVar, roundedRGBA);

                    saveColorSetting(settingKey, roundedRGBA);
                });

                textElement.addEventListener('change', function () {
                    const rgbaColor = this.value;

                    pickr.setColor(this.value);
                    saveColorSetting(settingKey, rgbaColor);
                    document.documentElement.style.setProperty(cssVar, rgbaColor);
                    pickerElement.style.backgroundColor = rgbaColor;
                });

                pickr.on('hide', () => {
                    const rgbaColor = pickr.getColor().toRGBA().toString();
                    pickerElement.style.backgroundColor = rgbaColor;
                });
            }

            return new Promise((resolve) => {
                const pickrCss = createElement('link', {
                    rel: 'stylesheet',
                    href: 'https://cdn.jsdelivr.net/npm/@simonwep/pickr/dist/themes/nano.min.css'
                });
                document.head.appendChild(pickrCss);

                const pickrScript = createElement('script', {
                    src: 'https://cdn.jsdelivr.net/npm/@simonwep/pickr/dist/pickr.min.js',
                    onload: () => resolve() // Pass function reference directly
                });
                document.head.appendChild(pickrScript);
            }).then(() => {
                setupRGBAPickr('lingqBackgroundPicker', 'lingqBackgroundText', 'lingqBackground', '--lingq-background');
                setupRGBAPickr('lingqBorderPicker', 'lingqBorderText', 'lingqBorder', '--lingq-border');
                setupRGBAPickr('lingqBorderLearnedPicker', 'lingqBorderLearnedText', 'lingqBorderLearned', '--lingq-border-learned');
                setupRGBAPickr('knownBackgroundPicker', 'knownBackgroundText', 'knownBackground', '--known-background');
                setupRGBAPickr('knownBorderPicker', 'knownBorderText', 'knownBorder', '--known-border');
                setupRGBAPickr('fontColorPicker', 'fontColorText', 'fontColor', '--font-color');
                setupRGBAPickr('playingUnderlinePicker', 'playingUnderlineText', 'playingUnderline', '--is-playing-underline');
            });
        }

        settingsButton.addEventListener("click", () => {
            settingsPopup.style.display = "block";
            initializePickrs();

            const dragHandle = document.getElementById("lingqAddonSettingsDragHandle");
            makeDraggable(settingsPopup, dragHandle);
        });

        const styleTypeSelector = document.getElementById("styleTypeSelector");
        styleTypeSelector.addEventListener("change", (event) => {
            const selectedStyleType = event.target.value;
            storage.set("styleType", selectedStyleType);
            document.getElementById("videoSettings").style.display = selectedStyleType === "video" ? "block" : "none";
            document.getElementById("sentenceVideoSettings").style.display = selectedStyleType === "off" ? "block" : "none";
            applyStyles(selectedStyleType, document.getElementById("colorModeSelector").value);
        });

        function updateColorInputs(colorSettings) {
            document.getElementById("fontColorText").value = colorSettings.fontColor;
            document.getElementById("lingqBackgroundText").value = colorSettings.lingqBackground;
            document.getElementById("lingqBorderText").value = colorSettings.lingqBorder;
            document.getElementById("lingqBorderLearnedText").value = colorSettings.lingqBorderLearned;
            document.getElementById("knownBackgroundText").value = colorSettings.knownBackground;
            document.getElementById("knownBorderText").value = colorSettings.knownBorder;
            document.getElementById("playingUnderlineText").value = colorSettings.playingUnderline;

            const fontColorPicker = document.getElementById("fontColorPicker");
            if (fontColorPicker) fontColorPicker.style.backgroundColor = colorSettings.fontColor;

            const playingUnderlinePicker = document.getElementById("playingUnderlinePicker");
            if (playingUnderlinePicker) playingUnderlinePicker.style.backgroundColor = colorSettings.playingUnderline;
        }

        function updateColorPickerBackgrounds(colorSettings) {
            const pickerIds = [
                { id: "lingqBackgroundPicker", color: colorSettings.lingqBackground },
                { id: "lingqBorderPicker", color: colorSettings.lingqBorder },
                { id: "lingqBorderLearnedPicker", color: colorSettings.lingqBorderLearned },
                { id: "knownBackgroundPicker", color: colorSettings.knownBackground },
                { id: "knownBorderPicker", color: colorSettings.knownBorder },
                { id: "fontColorPicker", color: colorSettings.fontColor },
                { id: "playingUnderlinePicker", color: colorSettings.playingUnderline }
            ];

            pickerIds.forEach(item => {
                const picker = document.getElementById(item.id);
                if (picker) {
                    picker.style.backgroundColor = item.color;
                }
            });
        }

        function updateCssColorVariables(colorSettings) {
            document.documentElement.style.setProperty("--font-color", colorSettings.fontColor);
            document.documentElement.style.setProperty("--lingq-background", colorSettings.lingqBackground);
            document.documentElement.style.setProperty("--lingq-border", colorSettings.lingqBorder);
            document.documentElement.style.setProperty("--lingq-border-learned", colorSettings.lingqBorderLearned);
            document.documentElement.style.setProperty("--known-background", colorSettings.knownBackground);
            document.documentElement.style.setProperty("--known-border", colorSettings.knownBorder);
            document.documentElement.style.setProperty("--is-playing-underline", colorSettings.playingUnderline);
        }

        function updateColorMode(event) {
            event.stopPropagation();

            const selectedColorMode = this.value;
            const settingsPopup = document.getElementById("lingqAddonSettingsPopup");
            settingsPopup.style.backgroundColor = selectedColorMode === "dark" ? "#2a2c2e" : "#ffffff";

            storage.set("colorMode", selectedColorMode);

            const colorSettings = getColorSettings(selectedColorMode);

            updateColorInputs(colorSettings);

            document.documentElement.style.setProperty(
                "--background-color",
                selectedColorMode === "dark" ? "#2a2c2e" : "#ffffff"
            );
            updateCssColorVariables(colorSettings);

            applyStyles(document.getElementById("styleTypeSelector").value, selectedColorMode);

            updateColorPickerBackgrounds(colorSettings);
        }

        document.getElementById("colorModeSelector").addEventListener("change", updateColorMode);

        function setupSlider(sliderId, valueId, settingKey, unit, cssVar, valueTransform) {
            const slider = document.getElementById(sliderId);
            const valueDisplay = document.getElementById(valueId);

            slider.addEventListener("input", function () {
                const value = parseFloat(this.value);
                const transformedValue = valueTransform(value);

                valueDisplay.textContent = transformedValue.toString().replace(unit, '');
                storage.set(settingKey, value);
                document.documentElement.style.setProperty(cssVar, transformedValue);
            });
        }

        setupSlider("fontSizeSlider", "fontSizeValue", "fontSize", "rem", "--font-size", (val) => `${val}rem`);
        setupSlider("lineHeightSlider", "lineHeightValue", "lineHeight", "", "--line-height", (val) => val);
        setupSlider("heightBigSlider", "heightBigValue", "heightBig", "px", "--height-big", (val) => `${val}px`);
        setupSlider("sentenceHeightSlider", "sentenceHeightValue", "sentenceHeight", "px", "--sentence-height", (val) => `${val}px`);
        setupSlider("widgetWidthSlider", "widgetWidthValue", "widgetWidth", "px", "--widget-width", (val) => `${val}px`);

        const autoFinishingCheckbox = document.getElementById("autoFinishingCheckbox");
        autoFinishingCheckbox.addEventListener('change', (event) => {
            const checked = event.target.checked;
            storage.set("autoFinishing", checked);
        });

        const chatWidgetCheckbox = document.getElementById("chatWidgetCheckbox");
        chatWidgetCheckbox.addEventListener('change', (event) => {
            const checked = event.target.checked;
            document.getElementById("llmSection").style.display = checked ? "block" : "none";
            storage.set("chatWidget", checked);
        });

        const llmProviderModelSelector = document.getElementById("llmProviderModelSelector");
        llmProviderModelSelector.addEventListener("change", (event) => {
            const selectedProvider = event.target.value;
            storage.set("llmProviderModel", selectedProvider);
        });

        const llmApiKeyInput = document.getElementById("llmApiKeyInput");
        llmApiKeyInput.addEventListener("change", (event) => {
            const apiKey = event.target.value;
            storage.set("llmApiKey", apiKey);
        });

        const askSelectedCheckbox = document.getElementById("askSelectedCheckbox");
        askSelectedCheckbox.addEventListener('change', (event) => {
            const checked = event.target.checked;
            storage.set("askSelected", checked);
        });

        const ttsCheckbox = document.getElementById("ttsCheckbox");
        ttsCheckbox.addEventListener('change', (event) => {
            const checked = event.target.checked;
            document.getElementById("ttsSection").style.display = checked ? "block" : "none";
            storage.set("tts", checked);
        });

        const ttsApiKeyInput = document.getElementById("ttsApiKeyInput");
        ttsApiKeyInput.addEventListener("change", (event) => {
            const apiKey = event.target.value;
            storage.set("ttsApiKey", apiKey);
        });

        const ttsVoiceSelector = document.getElementById("ttsVoiceSelector");
        ttsVoiceSelector.addEventListener("change", (event) => {
            const selectedVoice = event.target.value;
            storage.set("ttsVoice", selectedVoice);
        });

        const ttsWordCheckbox = document.getElementById("ttsWordCheckbox");
        ttsWordCheckbox.addEventListener('change', (event) => {
            const checked = event.target.checked;
            storage.set("ttsWord", checked);
        });

        const ttsSentenceCheckbox = document.getElementById("ttsSentenceCheckbox");
        ttsSentenceCheckbox.addEventListener('change', (event) => {
            const checked = event.target.checked;
            storage.set("ttsSentence", checked);
        });

        function setupShortcutInput(inputId, settingKey) {
            const input = document.getElementById(inputId);
            if (!input) return;

            input.addEventListener("input", function() {
                const allowedPattern = /^[a-z0-9`~!@#$%^&*()_+=-]*$/;

                let value = this.value.toLowerCase();

                if (!allowedPattern.test(value)) {
                    this.value = "";
                    return;
                }

                if (value.length > 1) {
                    value = value[0];
                    this.value = value;
                }

                storage.set(settingKey, value);
                settings[settingKey] = value;
            });
        }

        setupShortcutInput("shortcutVideoFullscreenInput", "shortcutVideoFullscreen");
        setupShortcutInput("shortcutBackward5sInput", "shortcutBackward5s");
        setupShortcutInput("shortcutForward5sInput", "shortcutForward5s");
        setupShortcutInput("shortcutTTSPlayInput", "shortcutTTSPlay");
        setupShortcutInput("shortcutTranslatorOpenInput", "shortcutTranslator");
        setupShortcutInput("shortcutMakeKnownInput", "shortcutMakeKnown");
        setupShortcutInput("shortcutDictionaryOpenInput", "shortcutDictionary");
        setupShortcutInput("shortcutCopySelectedInput", "shortcutCopySelected");
        setupShortcutInput("shortcutMeaningInputInput", "shortcutMeaningInput");
        setupShortcutInput("shortcutChatInputInput", "shortcutChatInput");

        document.getElementById("closeSettingsBtn").addEventListener("click", () => {
            settingsPopup.style.display = "none";
        });

        function resetSettings() {
            if (!confirm("Reset all settings to default?")) return;

            const currentColorMode = document.getElementById("colorModeSelector").value;
            const defaultColorSettings = currentColorMode === "dark" ? defaults.darkColors : defaults.whiteColors;

            document.getElementById("styleTypeSelector").value = defaults.styleType;
            document.getElementById("fontSizeSlider").value = defaults.fontSize;
            document.getElementById("fontSizeValue").textContent = defaults.fontSize;
            document.getElementById("lineHeightSlider").value = defaults.lineHeight;
            document.getElementById("lineHeightValue").textContent = defaults.lineHeight;
            document.getElementById("heightBigSlider").value = defaults.heightBig;
            document.getElementById("heightBigValue").textContent = defaults.heightBig;
            document.getElementById("widgetWidthSlider").value = defaults.widgetWidth;
            document.getElementById("sentenceHeightSlider").value = defaults.sentenceHeight;
            document.getElementById("sentenceHeightValue").textContent = defaults.sentenceHeight;

            updateColorInputs(defaultColorSettings);
            updateColorPickerBackgrounds(defaultColorSettings);

            applyStyles(defaults.styleType, currentColorMode);

            document.getElementById("videoSettings").style.display = defaults.styleType === "video" ? "block" : "none";
            document.getElementById("sentenceVideoSettings").style.display = defaults.styleType === "off" ? "block" : "none";

            document.documentElement.style.setProperty("--font-size", `${defaults.fontSize}rem`);
            document.documentElement.style.setProperty("--line-height", defaults.lineHeight);
            document.documentElement.style.setProperty("--height-big", `${defaults.heightBig}px`);
            document.documentElement.style.setProperty("--sentence-height", `${defaults.sentenceHeight}px`);
            document.documentElement.style.setProperty("--widget-width", `${defaults.widgetWidth}px`);
            updateCssColorVariables(defaultColorSettings);

            document.getElementById("autoFinishingCheckbox").checked = defaults.autoFinishing;

            document.getElementById("chatWidgetCheckbox").value = defaults.chatWidget;
            document.getElementById("llmProviderModelSelector").value = defaults.llmProviderModel;
            document.getElementById("llmApiKeyInput").value = defaults.llmApiKey;
            document.getElementById("askSelectedCheckbox").value = defaults.askSelected;

            document.getElementById("ttsCheckbox").value = defaults.tts;
            document.getElementById("ttsApiKeyInput").value = defaults.ttsApiKey;
            document.getElementById("ttsVoiceSelector").value = defaults.ttsVoice;
            document.getElementById("ttsWordCheckbox").value = defaults.ttsWord;
            document.getElementById("ttsSentenceCheckbox").value = defaults.ttsSentence;

            document.getElementById("shortcutVideoFullscreenInput").value = defaults.shortcutVideoFullscreen;
            document.getElementById("shortcutBackward5sInput").value = defaults.shortcutBackward5s;
            document.getElementById("shortcutForward5sInput").value = defaults.shortcutForward5s;
            document.getElementById("shortcutTTSPlayInput").value = defaults.shortcutTTSPlay;
            document.getElementById("shortcutTranslatorOpenInput").value = defaults.shortcutTranslator;
            document.getElementById("shortcutMakeKnownInput").value = defaults.shortcutMakeKnown;
            document.getElementById("shortcutDictionaryOpenInput").value = defaults.shortcutDictionary;
            document.getElementById("shortcutCopySelectedInput").value = defaults.shortcutCopySelected;
            document.getElementById("shortcutMeaningInputInput").value = defaults.shortcutMeaningInput;
            document.getElementById("shortcutChatInputInput").value = defaults.shortcutChatInput;

            for (const [key, value] of Object.entries(defaults)) {
                storage.set(key, value);
            }

            const prefix = currentColorMode === "dark" ? "dark_" : "white_";
            for (const [key, value] of Object.entries(defaultColorSettings)) {
                storage.set(prefix + key, value);
            }
        }

        document.getElementById("resetSettingsBtn").addEventListener("click", resetSettings);
    }

    async function setupDownloadWordsEventListeners(downloadWordsButton, downloadWordsPopup) {
        async function getAllWords(baseUrl, pageSize, apiType, additionalParams="", progressCallback = () => {}) {
            let allResults = [];
            let nextUrl = `${baseUrl}?page_size=${pageSize}&page=1${additionalParams}`;
            let currentPage = 0;
            let totalPages = 0;
            let isFirstCall = true;

            while (nextUrl) {
                try {
                    const response = await fetch(nextUrl);

                    if (!response.ok) {
                        throw new Error(`HTTP error! Status: ${response.status}`);
                    }

                    const data = await response.json();
                    currentPage++;

                    if (isFirstCall) {
                        isFirstCall = false;
                        totalPages = Math.ceil(data.count / pageSize);
                        console.log(`total pages: ${totalPages}`);
                    }

                    progressCallback(currentPage, totalPages, false, null, data.count);

                    if (apiType === 'lingq') {
                        const filteredResults = data.results.map(item => ({
                            pk: item.pk,
                            term: item.term,
                            fragment: item.fragment,
                            status: item.status,
                            hint: item.hints && item.hints[0] ? item.hints[0].text : null
                        }));
                        allResults = allResults.concat(filteredResults);
                    } else if (apiType === 'known') {
                        allResults = allResults.concat(data.results);
                    }

                    nextUrl = data.next;

                    if (nextUrl) {
                        console.log("Fetched page. Next URL:", nextUrl);
                    } else {
                        console.log("Finished fetching all pages");
                        progressCallback(currentPage, totalPages, true, null, data.count);
                    }
                } catch (error) {
                    console.error('Error fetching data:', error);
                    progressCallback(currentPage, totalPages, true, error, 0);
                    break;
                }
            }

            return allResults;
        }

        async function downloadWords(baseUrl, pageSize, fileName, apiType, additionalParams="") {
            const progressContainer = document.getElementById("downloadProgressContainer");
            const progressBar = document.getElementById("downloadProgressBar");
            const progressText = document.getElementById("downloadProgressText");

            if (progressContainer && progressBar && progressText) {
                progressBar.value = 0;
                progressBar.max = 100;
                progressText.textContent = "Initializing download...";
                progressContainer.style.display = "block";
            }

            const progressCallback = (currentPage, totalPages,_isDone, error_isErrorEncountered, totalCount) => {
                if (progressBar && progressText) {
                    if (error_isErrorEncountered) {
                        progressText.textContent = `Error fetching page ${currentPage}: ${error_isErrorEncountered.message}`;
                        progressBar.style.backgroundColor = 'red';
                        return;
                    }

                    progressBar.max = totalPages;
                    progressBar.value = currentPage;
                    progressText.textContent = `Fetching data... Page ${currentPage} of ${totalPages} (Total items: ${totalCount || 'N/A'})`;

                    if (_isDone) {
                        progressText.textContent = error_isErrorEncountered ? `Export failed: ${error_isErrorEncountered.message}` : `${totalCount} items exported`;
                    }
                }
            };

            try {
                const allWords = await getAllWords(baseUrl, pageSize, apiType, additionalParams, progressCallback);

                if (!allWords || allWords.length === 0) {
                    console.warn("No words found or an error occurred.");
                    return;
                }

                let blob;
                const fileType = fileName.split(".")[1];

                if (fileType === 'json') {
                    const dataString = JSON.stringify(allWords, null, 2);
                    blob = new Blob([dataString], { type: 'application/json' });
                } else if (fileType === 'csv') {
                    const headers = Object.keys(allWords[0]).join(',');
                    const rows = allWords.map(item => {
                        return Object.values(item).map(value => {
                            if (typeof value === 'string') {
                                return `"${value.replace(/"/g, '""')}"`;
                            }
                            return value;
                        }).join(',');
                    }).join('\n');

                    const dataString = headers + '\n' + rows;
                    blob = new Blob([dataString], { type: 'text/csv' });
                }

                downloadBlob(blob, fileName);
                console.log("Export completed.");
            } catch (error) {
                console.error('Error:', error);
            }
        }

        function downloadBlob(blob, fileName) {
            const url = URL.createObjectURL(blob);
            const a = createElement("a", {href: url, download: fileName});
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
            URL.revokeObjectURL(url);
        }

        downloadWordsButton.addEventListener("click", () => {
            downloadWordsPopup.style.display = "block";

            const progressContainer = document.getElementById("downloadProgressContainer");
            if (progressContainer) progressContainer.style.display = "none";

            const dragHandle = document.getElementById("lingqDownloadWordsDragHandle");
            if (dragHandle) {
                makeDraggable(downloadWordsPopup, dragHandle);
            }
        });

        const languageCode = await getLanguageCode();
        const pageSize = 1000;

        const setButtonsDisabled = (disabled) => {
            const buttons = downloadWordsPopup.querySelectorAll('.popup-button');
            buttons.forEach(button => {
                button.disabled = disabled;
            });
        };

        const handleDownloadButtonClick = async (url, filename, type, params = '') => {
            setButtonsDisabled(true);
            try {
                await downloadWords(url, pageSize, filename, type, params);
            } finally {
                setButtonsDisabled(false);
            }
        };

        // Download Unknown LingQs button
        document.getElementById("downloadUnknownLingqsBtn").addEventListener("click", async () => {
            await handleDownloadButtonClick(`https://www.lingq.com/api/v3/${languageCode}/cards/`, "unknown_lingqs.csv", 'lingq', '&status=0&status=1&status=2&status=3');
        });

        // Download Unknown LingQ Words button
        document.getElementById("downloadUnknownLingqWordsBtn").addEventListener("click", async () => {
            await handleDownloadButtonClick(`https://www.lingq.com/api/v3/${languageCode}/cards/`, "unknown_lingq_words.csv", 'lingq', '&status=0&status=1&status=2&status=3&phrases=false');
        });

        // Download Unknown LingQ phrases button
        document.getElementById("downloadUnknownLingqPhrasesBtn").addEventListener("click", async () => {
            await handleDownloadButtonClick(`https://www.lingq.com/api/v3/${languageCode}/cards/`, "unknown_lingq_phrases.csv", 'lingq', '&status=0&status=1&status=2&status=3&phrases=True');
        });

        // Download Known LingQs button
        document.getElementById("downloadKnownLingqsBtn").addEventListener("click", async () => {
            await handleDownloadButtonClick(`https://www.lingq.com/api/v3/${languageCode}/cards/`, "known_lingqs.csv", 'lingq', '&status=4');
        });

        // Download known words button
        document.getElementById("downloadKnownWordsBtn").addEventListener("click", async () => {
            await handleDownloadButtonClick(`https://www.lingq.com/api/v2/${languageCode}/known-words/`, "known_words.csv", "known");
        });

        // Close button
        document.getElementById("closeDownloadWordsBtn").addEventListener("click", () => {
            downloadWordsPopup.style.display = "none";
        });
    }

    function setupEventListeners() {
        document.getElementById("lingqLessonComplete").addEventListener("click", finishLesson);
    }

    function applyStyles(styleType, colorMode) {
        const colorSettings = getColorSettings(colorMode);

        let baseCSS = generateBaseCSS(colorSettings, colorMode);
        let layoutCSS = generateLayoutCSS();
        let specificCSS = "";

        switch (colorMode) {
            case "dark":
                clickElement(".reader-themes-component > button:nth-child(5)");
                break;
            case "white":
                clickElement(".reader-themes-component > button:nth-child(1)");
                break;
        }

        switch (styleType) {
            case "video":
                specificCSS = generateVideoCSS();
                break;
            case "video2":
                specificCSS = generateVideo2CSS();
                break;
            case "audio":
                specificCSS = generateAudioCSS();
                break;
            case "off":
                specificCSS = generateOffModeCSS();
                layoutCSS = "";
                break;
        }

        baseCSS += layoutCSS;
        baseCSS += specificCSS;

        if (styleElement) {
            styleElement.remove();
            styleElement = null;
        }

        styleElement = createElement("style", {textContent: baseCSS});
        document.querySelector("head").appendChild(styleElement);
    }

    function generateBaseCSS(colorSettings, colorMode) {
        return`
        :root {
            --font-size: ${settings.fontSize}rem;
            --line-height: ${settings.lineHeight};

            --font-color: ${colorSettings.fontColor};
            --lingq-background: ${colorSettings.lingqBackground};
            --lingq-border: ${colorSettings.lingqBorder};
            --lingq-border-learned: ${colorSettings.lingqBorderLearned};
            --known-background: ${colorSettings.knownBackground};
            --known-border: ${colorSettings.knownBorder};
            --is-playing-underline: ${colorSettings.playingUnderline};

            --background-color: ${colorMode === "dark" ? "#2a2c2e" : "#ffffff"}
        }

        /*Color picker*/

        .color-picker {
            width: 30px;
            height: 15px;
            border-radius: 4px;
            cursor: pointer;
        }

        .pcr-app {
            z-index: 10001 !important;
        }

        .pcr-app .pcr-interaction .pcr-result {
            color: var(--font-color) !important;
        }

        /*Popup settings*/

        #lingqAddonSettings {
            color: var(--font-color);
        }

        #lingqAddonSettingsPopup, #lingqDownloadWordsPopup {
            position: fixed;
            top: 40%;
            left: 40%;
            transform: translate(-40%, -40%);
            background-color: var(--background-color);
            color: var(--font-color);
            border: 1px solid rgb(125 125 125 / 30%);
            border-radius: 8px;
            box-shadow: 8px 8px 8px rgba(0, 0, 0, 0.2);
            z-index: 10000;
            display: none;
            max-height: 90vh;
            overflow-y: auto;
        }

        #lingqAddonSettingsDragHandle, #lingqDownloadWordsDragHandle {
            cursor: move;
            background-color: rgba(128, 128, 128, 0.2);
            padding: 8px;
            border-radius: 8px 8px 0 0;
            text-align: center;
            user-select: none;
        }

        .popup-row {
            margin: 5px 0;
        }

        .nav-button {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.2rem;
            margin-left: 10px;
            padding: 5px;
        }

        .popup-button {
            padding: 5px 10px;
            border: 1px solid rgb(125, 125, 125, 50%);
            border-radius: 5px;
            margin: 5px 0;

        }

        .popup-section {
            border: 1px solid rgb(125 125 125 / 50%);
            padding: 5px 10px;
            border-radius: 5px;
            margin: 10px 0;
        }

        .popup-input {
            flex-grow: 1;
            border: 1px solid rgb(125 125 125 / 50%);
            border-radius: 5px;
        }

        #downloadProgressContainer {
            display: none;
        }

        #downloadProgressText {
            text-align: center;
            margin-bottom: 5px;
            font-size: 0.9em;
        }

        #downloadProgressBar {
            width: 100%;
            height: 20px;
        }

        progress[value]::-webkit-progress-bar {
            border-radius: 5px;
        }

        progress[value]::-webkit-progress-value {
            border-radius: 5px;
        }

        select {
            width: 100%;
            margin-top: 5px;
            padding: 5px;
            background: rgb(125 125 125 / 10%) !important;
        }

        /*Chat*/

        #chat-container {
            margin-bottom:5px;
            border: 1px solid rgb(125 125 125 / 35%);
            border-radius: 5px;
            min-height: 100px;
            max-height: 300px;
            overflow-y: auto;
            resize: vertical;
            padding: 5px !important;
            scrollbar-width: none !important;
        }

        .input-container {
            display: flex;
            margin-bottom:10px;
        }

        #user-input {
            flex-grow: 1;
            padding: 5px 10px;
            margin-right: 5px;
            border: 1px solid rgb(125 125 125 / 35%);
            border-radius: 5px;
            font-size: 0.85rem;
        }

        #send-button {
            padding: 5px 10px;
            border: 1px solid rgb(125 125 125 / 35%);
            border-radius: 5px;
        }

        .chat-message {
            padding: 5px;
            margin-bottom: 5px;
            border-radius: 8px;
            color: var(--font-color);
            font-size: 0.85rem;
        }

        .user-message {
            background-color: rgb(125 125 125 / 5%);
        }

        .bot-message {
            background-color: rgb(125 125 125 / 10%);
        }

        @keyframes gradient-move {
            0% {
                background-position: 200% 0;
            }
            100% {
                background-position: -200% 0;
            }
        }

        .loading-message {
            background: linear-gradient(
                90deg,
                rgb( from var(--font-color) r g b / 0.5) 0%,
                var(--font-color) 50%,
                rgb( from var(--font-color) r g b / 0.5) 100%
            );
            background-size: 200% 200%;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: gradient-move 3s linear infinite;
        }

        #chat-container li {
            list-style: inside !important;
        }

        #chat-container ui {
            margin-top: 0.5rem;
        }

        #chat-container hr {
            margin: 0.3rem 0 0.5rem;
            border: 0;
            height: 1px;
            background-color: rgb(125 125 125 / 50%);
        }

        /*tts*/

        #playAudio {
            cursor: pointer;
            font-size: 1.5rem;
            padding: 5px;
        }

        /*font settings*/

        .reader-container {
            line-height: var(--line-height) !important;
            font-size: var(--font-size) !important;
            padding: 0 !important;
        }

        .sentence-text-head {
            min-height: 4.5rem !important;
        }

        .reader-container p {
            margin-top: 0 !important;
        }

        .reader-container p span.sentence-item,
        .reader-container p .sentence {
            color: var(--font-color) !important;
        }

        .sentence.is-playing,
        .sentence.is-playing span {
            text-underline-offset: .2em !important;
            text-decoration-color: var(--is-playing-underline) !important;
        }

        /*highlightings*/

        .phrase-item {
            padding: 0 !important;
        }

        .phrase-item:not(.phrase-item-status--4, .phrase-item-status--4x2) {
            background-color: var(--lingq-background) !important;
        }

        .phrase-item.phrase-item-status--4,
        .phrase-item.phrase-item-status--4x2 {
            background-color: rgba(0, 0, 0, 0) !important;
        }

        .phrase-cluster:not(:has(.phrase-item-status--4, .phrase-item-status--4x2)) {
            border: 1px solid var(--lingq-border) !important;
            border-radius: .25rem;
        }

        .phrase-cluster:has(.phrase-item-status--4, .phrase-item-status--4x2) {
            border: 1px solid var(--lingq-border-learned) !important;
            border-radius: .25rem;
        }

        .reader-container .sentence .lingq-word:not(.is-learned) {
            border: 1px solid var(--lingq-border) !important;
            background-color: var(--lingq-background) !important;
        }

        .reader-container .sentence .lingq-word.is-learned {
            border: 1px solid var(--lingq-border-learned) !important;
        }

        .reader-container .sentence .blue-word {
            border: 1px solid var(--known-border) !important;
            background-color: var(--known-background) !important;;
        }

        .phrase-cluster:hover,
        .phrase-created:hover {
            padding: 0 !important;
        }

        .phrase-cluster:hover .phrase-item,
        .phrase-created .phrase-item {
            padding: 0 !important;
        }

        .reader-container .sentence .selected-text {
            padding: 0 !important;
        }
        `;
    }

    function generateLayoutCSS() {
        return `
        :root {
            --article-height: calc(var(--app-height) - var(--height-big));
            --header-height: 50px;
            --widget-width: 400px;
            --footer-height: 80px;
            --reader-layout-columns: 1fr var(--widget-width);
            --reader-layout-rows: var(--article-height) calc(var(--height-big) - var(--footer-height)) var(--footer-height);
        }

        /*header settings*/

        .main-wrapper {
            padding: 0 !important;
        }

        #main-nav {
            z-index: 1;
        }

        #main-nav > nav {
            height: var(--header-height);
        }

        #main-nav > nav > div:nth-child(1) {
            height: var(--header-height);
        }

        .main-header {
            pointer-events: none;
        }

        .main-header > div {
            grid-template-columns: 1fr 150px !important;
            padding-left: 400px !important;
        }

        .main-header section:nth-child(1) {
            display: none;
        }

        .main-header section {
            pointer-events: auto;
            z-index: 1;
        }

        .main-header svg {
            width: 20px !important;
            height: 20px !important;
        }

        .main-header section .dropdown-content {
            position: fixed;
        }

        .lesson-progress-section {
            grid-template-rows: unset !important;
            grid-template-columns: unset !important;
            grid-column: 1 !important;
            pointer-events: auto;
        }

        .lesson-progress-section .rc-slider{
            grid-row: unset !important;
            grid-column: unset !important;
            width: 50% !important;
        }

        /*layout*/

        #lesson-reader {
            grid-template-columns: var(--reader-layout-columns);
            grid-template-rows: var(--reader-layout-rows);
            overflow-y: hidden;
            height: auto !important;
        }

        .sentence-text {
            height: calc(var(--article-height) - var(--header-height)) !important;
            padding: 0 0 20px !important;
        }

        .reader-container-wrapper {
            height: 100% !important;
        }

        .widget-area {
            padding: var(--header-height) 0 10px !important;
            margin: 0 10px !important;
            height: 100% !important;
            justify-content: center;
            display: flex;
        }

        .reader-widget {
            display: flow !important;
            overflow-y: auto;
            width: 100% !important;
            height: fit-content !important;
            max-width: none !important;
            scrollbar-width: none !important;
        }

        .reader-widget:not(.reader-widget--resources) {
            padding: 10px !important;
        }

        .reader-widget.reader-widget--resources {
            padding: 10px 15px !important;
        }

        .reference-main {
            margin-bottom: 5px;
        }

        .reference-word {
            white-space: pre-line !important;
        }

        .section-widget--main {
            margin: 0 !important;
            padding: 0 !important;
        }

        .appCue-poular-hints {
            max-height: 350px;
            overflow-y: auto;
            scrollbar-width: none !important;
        }

        .section-widget--foot {
            margin: 0 !important;
            padding: 10px 0 0 !important;
            display: block !important;
        }

        .dictionary-resources {
            width: 100% !important;
        }

        .word-status-bar {
            width: 100%;
            grid-template-columns: repeat(6, 1fr) !important;
            grid-gap: 10px !important;
        }

        .reference-helpers {
            display: none !important;
        }

        .userToast {
            position: fixed;
            top: 60px;
            right: 20px;
            background-color: var(--background-color);
            color: ${settings.colorMode === "dark" ? "white" : "#ffffff"};
            padding: 5px 10px;
            border-radius: 10px;
            z-index: 9999;
            opacity: 0;
            transition: opacity 0.5s ease-in-out;
            font-size: 0.8rem;
            font-weight: lighter;
            pointer-events: none;
        }

        .main-footer {
            grid-area: 3 / 1 / 3 / 1 !important;
            align-self: end;
            padding: 5px 10px 10px;
            height: 100%;
        }

        .main-footer > div {
            height: 100%;
        }

        .lesson-bottom > div {
            position: unset !important;
        }

        .main-content {
            grid-template-rows: var(--header-height) 1fr !important;
            overflow: hidden;
            align-items: center;
        }

        /*make prev/next page buttons compact*/

        .reader-component {
            grid-template-columns: 0 1fr 0 !important;
            align-items: baseline;
        }

        .reader-component > div > a.button > span {
            width: 0.5rem !important;
        }

        .reader-component > div > a.button > span > svg {
            width: 15px !important;
            height: 15px !important;
        }

        .loadedContent {
            padding: 0 0 0 10px !important;;
        }

        /*font settings*/

        .reader-container {
            margin: 0 !important;
            float: left !important;
            columns: unset !important;
            overflow-y: scroll !important;
            max-width: unset !important;
        }

        /*video viewer*/

        .video-player {
            display: flex !important;
            justify-content: flex-end !important;
            pointer-events: none;
            z-index: 38 !important;
        }

        .video-player > .modal-background {
            background-color: rgb(26 28 30 / 0%) !important;
        }

        .video-player > .modal-content {
            max-width: var(--width-big) !important;
            margin: 0 0 10px 10px !important;
            border-radius: 0.75rem !important;
        }

        .video-player .modal-section {
            display: none !important;
        }

        .video-wrapper {
            height: var(--height-big) !important;
            overflow: hidden;
            pointer-events: auto;
        }

        /*video controller*/

        .rc-slider-rail {
            background-color: dimgrey !important;
        }

        .rc-slider-step {
            margin-top: -8px !important;
            height: 1.2rem !important;
        }

        .lingq-audio-player {
            margin-left: 10px;
        }

        .section--player.is-expanded {
            width: 100% !important;
            height: 100%;
            padding: 0 !important;
        }

        .sentence-mode-button {
            margin: 0 0 10px 0;
        }

        .player-wrapper {
            grid-template-columns: 1fr 40px !important;
            padding: 0 !important;
        }

        .audio-player {
            padding: 0 0.5rem !important;
            grid-template-rows: 16px 16px auto !important;
        }

        .audio-player--controllers a {
            height: 25px !important;
            padding: 0 1em !important;
            margin: 5px 0;
        }

        .audio-player--controllers span {
            height: 25px !important;
        }
        `;
    }

    function generateVideoCSS() {
        return `
        :root {
            --width-big: calc(100vw - var(--widget-width) - 10px);
            --height-big: ${settings.heightBig}px;
        }

        .main-content {
            grid-area: 1 / 1 / 2 / 2 !important;
        }

        .widget-area {
            grid-area: 1 / 2 / 3 / 2 !important;
        }

        .main-footer {
            grid-area: 3 / 2 / 4 / 3 !important;
            align-self: end;
        }

        .video-player {
            align-items: flex-start !important;
        }
        `;
    }

    function generateVideo2CSS() {
        return `
        :root {
            --width-big: calc(50vw - calc(var(--widget-width) / 2) - 10px);
            --height-big: calc(100vh - 65px);

            --reader-layout-columns: 1fr var(--widget-width) 1fr;
            --reader-layout-rows: var(--article-height) var(--footer-height);
            --article-height: calc(var(--app-height) - var(--footer-height));
        }

        #lesson-reader {
            grid-template-columns: var(--reader-layout-columns);
        }

        .main-content {
            grid-area: 1 / 1 / 2 / 2 !important;
        }

        .widget-area {
            grid-area: 1 / 2 / 2 / 3 !important;
        }

        .main-footer {
            grid-area: 2 / 2 / 3 / 3 !important;
            align-self: end;
        }

        .video-player {
            align-items: end !important;
        }
        `;
    }

    function generateAudioCSS() {
        return `
        :root {
            --width-big: calc(var(--widget-width) - 20px);
            --height-big: cald(var(--footer-height) - 10px);

            --reader-layout-rows: var(--article-height) var(--footer-height);
            --article-height: calc(var(--app-height) - var(--footer-height));
        }

        .main-content {
            grid-area: 1 / 1 / 2 / 2 !important;
        }

        .widget-area {
            grid-area: 1 / 2 / 2 / 2 !important;
        }

        .main-footer {
            grid-area: 2 / 1 / 3 / 2 !important;
            align-self: end;
        }

        .video-player {
            align-items: end !important;
        }

        .video-player > .modal-content {
            margin: 0 10px 10px !important;
        }
        `;
    }

    function generateOffModeCSS() {
        return `
        :root {
            --width-small: 440px;
            --height-small: 260px;
            --sentence-height: ${settings.sentenceHeight}px;
            --right-pos: 0.5%;
            --bottom-pos: 5.5%;
        }

        /*video player*/

        .video-player.is-minimized .video-wrapper,
        .sent-video-player.is-minimized .video-wrapper {
            height: var(--height-small);
            width: var(--width-small);
            overflow: auto;
            resize: both;
        }

        .video-player.is-minimized .modal-content,
        .sent-video-player.is-minimized .modal-content {
            max-width: calc(var(--width-small)* 3);
            margin-bottom: 0;
        }

        .video-player.is-minimized,
        .sent-video-player.is-minimized {
            left: auto;
            top: auto;
            right: var(--right-pos);
            bottom: var(--bottom-pos);
            z-index: 99999999;
            overflow: visible
        }

        /*sentence mode video player*/
        .loadedContent:has(#sentence-video-player-portal) {
            grid-template-rows: var(--sentence-height) auto auto 1fr !important;
        }

        #sentence-video-player-portal .video-section {
            width: 100% !important;
            max-width: none !important;
        }

        #sentence-video-player-portal .video-wrapper {
            height: 100% !important;
            max-height: none !important;
        }

        #sentence-video-player-portal div:has(> iframe) {
            height: 100% !important;
        }
        `;
    }

    function clickElement(selector) {
        const element = document.querySelector(selector);
        if (element) element.click();
    }

    function focusElement(selector) {
        const element = document.querySelector(selector);
        if (element) {
            element.focus();
            element.setSelectionRange(element.value.length, element.value.length);
        }
    }

    function copySelectedText() {
        const selected_text = document.querySelector(".reference-word");
        if (selected_text) {
            navigator.clipboard.writeText(selected_text.textContent);
        }
    }

    function finishLesson(){
        clickElement(".reader-component > .nav--right > a");
    }

    function preventPropagation(event){
        event.preventDefault();
        event.stopPropagation();
    }

    function setupKeyboardShortcuts() {
        document.addEventListener("keydown", function (event) {
            const targetElement = event.target;
            const isTextInput = targetElement.localName === "text" || targetElement.localName === "textarea" || targetElement.localName === "input";
            const withoutModifierKeys = !event.ctrlKey && !event.shiftKey && !event.altKey;
            const eventKey = event.key.toLowerCase();
            if (isTextInput) {
                if (targetElement.id === "user-input") return;
                if ((eventKey === 'enter' || eventKey === 'escape') && withoutModifierKeys) {
                    preventPropagation(event);
                    event.target.blur()
                } else {
                    event.stopPropagation();
                    return;
                }
            }

            const shortcuts = {
                [settings.shortcutVideoFullscreen]: () => clickElement(".modal-section > div > button:nth-child(2)"), // video full screen toggle
                [settings.shortcutMeaningInput]: () => focusElement(".reference-input-text"), // Move cursor to meaning input
                [settings.shortcutChatInput]: () => focusElement("#user-input"), // Move cursor to the chat widget input
                [settings.shortcutTTSPlay]: () => clickElement(".is-tts"), // Play tts audio
                [settings.shortcutTranslator]: () => clickElement(".dictionary-resources > a:nth-last-child(1)"), // Open Translator
                [settings.shortcutBackward5s]: () => clickElement(".audio-player--controllers > div:nth-child(1) > a"), // 5 sec Backward
                [settings.shortcutForward5s]: () => clickElement(".audio-player--controllers > div:nth-child(2) > a"), // 5 sec Forward
                [settings.shortcutMakeKnown]: () => document.dispatchEvent(new KeyboardEvent("keydown", { key: "k" })), // Simulate original 'k' for Make Word Known
                [settings.shortcutDictionary]: () => clickElement(".dictionary-resources > a:nth-child(1)"), // Open Dictionary
                [settings.shortcutCopySelected]: () => copySelectedText() // Copy selected text
            };

            if (shortcuts[eventKey] && withoutModifierKeys) {
                preventPropagation(event);
                shortcuts[eventKey]();
            }
        }, true);
    }

    async function getUserProfile() {
        const url = `https://www.lingq.com/api/v3/profiles/`;

        const response = await fetch(url);
        const data = await response.json();

        return data.results[0]
    }

    async function getLanguageCode() {
        const userProfile = await getUserProfile();
        return userProfile.active_language;
    }

    async function getDictionaryLanguage() {
        const userProfile = await getUserProfile();
        return await userProfile.dictionary_languages[0];
    }

    async function getDictionaryLocalePairs() {
        const url = `https://www.lingq.com/api/v2/dictionary-locales/`;

        const response = await fetch(url);
        const data = await response.json();

        return Object.fromEntries(data.map(item => [item.code, item.title]));
    }

    function getLessonId() {
        const url = document.URL;
        const regex = /https*:\/\/www\.lingq\.com\/\w+\/learn\/\w+\/web\/reader\/(\d+)/;
        const match = url.match(regex);

        return match[1];
    }

    async function getCollectionId() {
        const url = document.URL;
        const regex = /https*:\/\/www\.lingq\.com\/\w+\/learn\/\w+\/web\/library\/course\/(\d+)/;
        const match = url.match(regex);

        return match[1];
    }

    async function getLessonInfo(lessonId) {
        const languageCode = await getLanguageCode();
        const url = `https://www.lingq.com/api/v3/${languageCode}/lessons/counters/?lesson=${lessonId}`;

        const response = await fetch(url);
        const data = await response.json();

        return data[lessonId];
    }

    async function getAllLessons(languageCode, collectionId) {
        let allLessons = [];
        let nextUrl = `https://www.lingq.com/api/v3/${languageCode}/search/?page=1&page_size=1000&collection=${collectionId}`;

        while (nextUrl) {
            try {
                const response = await fetch(nextUrl);
                if (!response.ok) {
                    throw new Error(`HTTP error! Status: ${response.status}`);
                }

                const data = await response.json();
                allLessons = allLessons.concat(data.results);
                nextUrl = data.next;
            } catch (error) {
                console.error('Error fetching lessons:', error);
                break;
            }
        }

        return allLessons;
    }

    async function setLessonProgress(lessonId, wordIndex) {
        const languageCode = await getLanguageCode();
        const url = `https://www.lingq.com/api/v3/${languageCode}/lessons/${lessonId}/bookmark/`;
        const payload = { wordIndex: wordIndex, completedWordIndex: wordIndex, client: 'web' };

        fetch(url, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload)
        });
    }

    function setupYoutubePlayerCustomization() {
        function replaceNoCookie() {
            document.querySelectorAll("iframe").forEach(function (iframe) {
                let src = iframe.getAttribute("src");
                if (src && src.includes("disablekb=1")) {
                    src = src.replace("disablekb=1", "disablekb=0"); // keyboard controls are enabled
                    src = src + "&cc_load_policy=1"; // caption is shown by default
                    src = src + "&controls=0"; // player controls do not display in the player
                    iframe.setAttribute("src", src);
                }
            });
        }

        async function setupSliderObserver() {
            const lessonId = getLessonId();
            const lessonInfo = await getLessonInfo(lessonId);
            let lastCompletedPercentage = lessonInfo["progress"];
            console.log(`last progress: ${lastCompletedPercentage}`);

            const sliderTrack = document.querySelector('.audio-player--progress .rc-slider-track');

            const sliderContainer = createSliderElements();
            const videoContainer = document.querySelector(".modal-content > div");
            videoContainer.appendChild(sliderContainer);
            const videoSliderTrack = sliderContainer.querySelector(".rc-slider-track");

            const syncVideoSliderTrack = (videoSliderTrack, sliderTrack) => {
                videoSliderTrack.style.cssText = sliderTrack.style.cssText;
            };

            const updateLessonProgress = (lessonId, lessonInfo, progressPercentage, lastCompletedPercentage) => {
                const progressUpdatePeriod = 5;
                const flooredProgressPercentage = Math.floor(progressPercentage / progressUpdatePeriod) * progressUpdatePeriod;

                if (flooredProgressPercentage > lastCompletedPercentage) {
                    console.log(`progress percentage: ${flooredProgressPercentage}. Updated`);
                    const wordIndex = Math.floor(lessonInfo["totalWordsCount"] * (flooredProgressPercentage / 100));
                    setLessonProgress(lessonId, wordIndex);
                    return flooredProgressPercentage;
                }
                return lastCompletedPercentage;
            };

            const sliderObserver = new MutationObserver(function (mutationsList) {
                for (const mutation of mutationsList) {
                    if (mutation.type === 'attributes' && mutation.attributeName === 'style') {
                        syncVideoSliderTrack(videoSliderTrack, sliderTrack);

                        const progressPercentage = parseFloat(sliderTrack.style.width);

                        lastCompletedPercentage = updateLessonProgress(lessonId, lessonInfo, progressPercentage, lastCompletedPercentage);
                        const isLessonFinished = progressPercentage >= 99.5;
                        if (isLessonFinished && settings.autoFinishing) {
                            setTimeout(finishLesson, 3000);
                        }
                    }
                }
            });

            sliderObserver.observe(sliderTrack, {attributes: true, attributeFilter: ['style']});
            console.log('Observer started for rc-slider-track');
        }

        function createSliderElements() {
            const sliderContainer = createElement("div", {className: "rc-slider rc-slider-horizontal"});
            const sliderRail = createElement("div", {className: "rc-slider-rail"});
            const sliderTrack = createElement("div", {className: "rc-slider-track"});
            sliderContainer.appendChild(sliderRail);
            sliderContainer.appendChild(sliderTrack);
            return sliderContainer;
        }

        const iframeObserver = new MutationObserver(function (mutationsList) {
            for (const mutation of mutationsList) {
                if (mutation.type === "childList" && mutation.addedNodes.length > 0) {
                    mutation.addedNodes.forEach((node) => {
                        if (node.nodeName === "IFRAME") {
                            replaceNoCookie();
                            clickElement('.modal-section.modal-section--head button[title="Expand"]');
                            setupSliderObserver();
                        }
                    });
                }
            }
        });

        iframeObserver.observe(document.body, {childList: true, subtree: true, attributes: true, attributeFilter: ["src"]});
    }

    async function changeScrollAmount(selector, scrollAmount) {
        const readerContainer = await waitForElement(selector);

        if (readerContainer) {
            readerContainer.addEventListener("wheel", (event) => {
                event.preventDefault();
                const delta = event.deltaY;
                readerContainer.scrollTop += delta * scrollAmount;
            });
        }
    }

    function setupSentenceFocus() {
        function focusPlayingSentence() {
            const playingSentence = document.querySelector(".sentence.is-playing");
            if (playingSentence) {
                /*
                playingSentence.scrollIntoView({
                    behavior: "smooth",
                    block: "center"
                });
                */
                const scrolling_div = document.querySelector(".reader-container")
                scrolling_div.scrollTop = playingSentence.offsetTop + Math.floor(playingSentence.offsetHeight / 2) - Math.floor(scrolling_div.offsetHeight / 2);

            }
        }

        const observer = new MutationObserver((mutations) => {
            mutations.forEach((mutation) => {
                if (
                    mutation.type === "attributes" &&
                    mutation.attributeName === "class" &&
                    mutation.target.matches(".sentence")
                ) {
                    focusPlayingSentence();
                }
            });
        });

        const container = document.querySelector(".sentence-text");
        if (container) {
            observer.observe(container, {
                attributes: true,
                subtree: true
            });
        }
    }

    async function waitForElement(selector) {
        return new Promise(resolve => {
            if (document.querySelector(selector)) {
                return resolve(document.querySelector(selector));
            }

            const observer = new MutationObserver(() => {
                if (document.querySelector(selector)) {
                    resolve(document.querySelector(selector));
                    observer.disconnect();
                }
            });

            observer.observe(document.documentElement, {
                childList: true,
                subtree: true
            });
        });
    }

    function getAllLeafNodes(root) {
        const leaves = [];
        function traverse(node) {
            if (node.nodeType === Node.TEXT_NODE) {
                if (node.textContent.trim() !== "") leaves.push(node);
                return;
            }
            if (node.nodeType === Node.ELEMENT_NODE || node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
                if (node.childNodes.length === 0) {
                    leaves.push(node);
                    return;
                }
                for (const child of node.childNodes) {
                    traverse(child);
                }
            }
        }
        traverse(root);
        return leaves;
    }

    function extractTextFromDOM(domElement) {
        const textParts = [];
        let sentenceElements = domElement.querySelectorAll('.sentence');
        sentenceElements = sentenceElements.length ? sentenceElements : [domElement];
        if (domElement.childNodes.length === 0) return null;

        sentenceElements.forEach(sentenceElement => {
            for (const childNode of getAllLeafNodes(sentenceElement)) {
                const text = childNode.textContent.trim();
                if (text) textParts.push(text);

                const parentNodeType = childNode.parentNode.nodeType;
                if (parentNodeType === Node.ELEMENT_NODE && childNode.parentNode.matches('.has-end-punctuation-question')) textParts.push('?');
                if (parentNodeType === Node.ELEMENT_NODE && childNode.parentNode.matches('.has-end-punctuation-period')) textParts.push('.');
            }
            textParts.push('\n');
        });

        return textParts.slice(0, -1).join(' ')
            .replace(/[^\S\n]?(\?|\.|\n)[^\S\n]?/g, '$1')
            .replace(/[^\S\n]?(,)/g, '$1');
    }

    function showToast(inputMessage) {
        const toast = createElement("div", {
            className: 'userToast',
            textContent: inputMessage
        });
        document.body.appendChild(toast);

        setTimeout(() => {
            toast.style.opacity = '1';
        }, 10);

        setTimeout(() => {
            toast.style.opacity = '0';
            setTimeout(() => {
                toast.remove();
            }, 1000);
        }, 1500);
    }

    function stopPlayingAudio(autioContext) {
        if (!autioContext || audioContext.state !== 'running') return;

        try {
            autioContext.close();
            autioContext = null;
        } catch (error) {
            console.error("Stop Audio:", error);
            throw error;
        }
    }

    let audioContext = null;
    async function playAudio(audioData, volume = 0.5) {
        stopPlayingAudio(audioContext);

        return new Promise((resolve, reject) => {
            audioContext = new AudioContext();
            const gainNode = audioContext.createGain();
            gainNode.gain.value = volume;
            gainNode.connect(audioContext.destination);

            const audioDataCopy = audioData.slice(0);

            audioContext.decodeAudioData(audioDataCopy)
                .then(buffer => {
                    const source = audioContext.createBufferSource();
                    source.buffer = buffer;
                    source.connect(gainNode);
                    source.start(0);

                    source.onended = () => {
                        resolve();
                        audioContext.close();
                    };
                    source.onerror = (e) => {
                        reject("Audio play error : " + e);
                    }
                })
                .catch(e => {
                    reject("Decoding error : " + e)
                });
        });
    }

    async function openAITTS(text, API_KEY, voice = "nova", playbackRate = 1, instructions) {
        const modelId = "gpt-4o-mini-tts";
        const apiUrl = "https://api.openai.com/v1/audio/speech";

        if (!API_KEY) {
            throw new Error("Invalid or missing OpenAI API key.  Please set the API_KEY");
        }

        if (!["nova", "onyx", "alloy", "echo", "fable", "shimmer"].includes(voice)) {
            console.warn(`Invalid voice "${voice}".  Using default voice "nova".`);
            voice = "nova";
        }

        if (typeof playbackRate !== 'number' || playbackRate < 0.5 || playbackRate > 1.5) {
            console.warn(`Invalid playback rate "${playbackRate}". Using default rate 1.`);
            playbackRate = 1;
        }

        try {
            const response = await fetch(apiUrl, {
                method: "POST",
                headers: {
                    "Accept": "audio/mpeg",
                    "Content-Type": "application/json",
                    "Authorization": `Bearer ${API_KEY}`
                },
                body: JSON.stringify({
                    input: text,
                    model: modelId,
                    voice: voice,
                    instructions: instructions,
                    speed: playbackRate
                })
            });

            if (!response.ok) {
                let errorMessage = `HTTP error! Status: ${response.status}`;
                try {
                    const errorBody = await response.json();
                    errorMessage += ` - OpenAI Error: ${errorBody?.error?.message || JSON.stringify(errorBody)}`;
                } catch (parseError) {
                    errorMessage += ` - Failed to parse error response.`;
                }
                throw new Error(errorMessage);
            }

            return await response.arrayBuffer();

        } catch (error) {
            console.error("Error during OpenAI TTS request:", error);
            throw error;
        }
    }

    async function setupLLMs() {
        async function updateWidget() {
            if (document.getElementById('chatWidget')) return;

            let targetSectionHead = document.querySelector("#lesson-reader .widget-area > .reader-widget > .section-widget--head");
            targetSectionHead = targetSectionHead ? targetSectionHead : document.querySelector("#lesson-reader .widget-area > .reader-widget");
            if (!targetSectionHead) return;

            const isSentence = !document.querySelector(".section-widget--main");

            const [llmProvider, llmModel] = settings.llmProviderModel.split(" ");
            const llmApiKey = settings.llmApiKey;
            console.log(llmProvider, llmModel)

            const systemPrompt = `
**System Prompt (Formatting & Core Rules):**
Ensure all translations, explanations, definitions, and examples are provided exclusively in '${userLanguage}', regardless of the original input language, using the specified HTML formatting for clarity.
You are a language assistant designed to help users understand words and sentences.

## Core Principles

* **Language:** Respond exclusively in '${userLanguage}'. Avoid using the original language for explanations, all content should be translated into '${userLanguage}'.
* **Formatting:** Use HTML tags ('<b>', '<i>', '<p>', '<ul>', '<li>', '<br>') but not <pre> for presentation. Output raw HTML as plain text, without Markdown tags (e.g., '# H1', '**Bold**', '> blockquote', '---') or code blocks.
* **Directness:** Provide succinct responses without unnecessary prefaces.
* **Accuracy:** Ensure precise translations and context-specific explanations.
* **Context:** Integrate context deeply in translations and explanations.
`
            const wordPhrasePrompt = `
Use this prompt only for the next input.
**Single Word/Phrase Input**
- Input will be given as: 'Input: "word or phrase" Context: "sentence including the word or phrase"'
1. Determine the base, dictionary form of the word or phrase. This means using the singular form for nouns (e.g., "cat" instead of "cats") and the infinitive form for verbs (e.g., "run" instead of "ran"). Use this base form consistently in the explanation and title.
2. Address and explain the base form of the word or phrase directly, even if the input is in a conjugated or inflected form. This is especially important for idioms.
3. Provide an explanation exclusively in ${userLanguage}, factoring in context, and explaining any idiomatic usage.
4. Generate a distinct, new example sentence to highlight word/phrase usage.
5. The example sentence and its translation should appear first in the original input language, then in ${userLanguage}.
6. Use this HTML structure (all content in ${userLanguage}):

<b>[Base form]</b> <i>([Part of Speech])</i>
<p>[Definition in ${userLanguage}]</p>
<hr>
<p>[Contextual explanation in ${userLanguage}]</p>
<hr>
<ul>
  <li>[New Example Sentence in original language]</li>
  <li>[Translation in ${userLanguage}]</li>
</ul>

*The structure and bolding/italics should convey the information. All content (definition, explanation, examples and translations) must be provided solely in ${userLanguage}, regardless of the input language.*

## Examples

### Example 1: Single Word with Context (Original language: English, User's language: Korean)

**User Input:**
'Input: "translators", Context: "However, the ESV translators chose to translate that same word as 'servant,' closing off the potential interpretation that she held any formal position of authority."'

**Output:**
<b>translator</b> <i>(명사)</i>
<p>번역가, 통역사</p>
<hr>
<p>This refers to individuals translating foreign content into their own language, as highlighted by the ESV Bible translators in context.</p>
<hr>
<ul>
  <li>Many translators work together on complex international projects.</li>
  <li>많은 번역가들이 복잡한 국제 프로젝트에 함께 작업합니다.</li>
</ul>

### Example 2: Single Word with Context (Original Language: Spanish, User Language: English)

**User Input:**
'Input: "lograr", Context: "Debemos lograr nuestros objetivos."'

**Assistant Output:**
<b>lograr</b> <i>(verb)</i>
<p>To achieve, to attain.</p>
<hr>
<p>This means to successfully reach or accomplish a goal. In context, it suggests the necessity to achieve our objectives.</p>
<hr>
<ul>
  <li>They hope to lograr success in the new venture.</li>
  <li>Ellos esperan lograr el éxito en la nueva empresa.</li>
</ul>

### Example 3: Phrase with Context (Original Language: German, User Language: French)

**User Input:**
'Input: "imstande sein", Context: "Er war imstande, das Problem zu lösen."'

**Assistant Output:**
<b>imstande sein</b> <i>(Redewendung)</i>
<p>Etre capable de, être en mesure de.</p>
<hr>
<p>Cela signifie être capable ou apte à faire quelque chose. Dans ce contexte, cela indique qu'il avait la capacité de résoudre le problème.</p>
<hr>
<ul>
  <li>Sie war imstande, die schwierige Aufgabe zu bewältigen.</li>
  <li>Elle était capable de maîtriser la tâche difficile.</li>
</ul>
Respond understood if you got it.
`
            const sentencePrompt = `
Use this prompt only for the next input.
**Sentence Input**
- Input will be given as: 'Input: "sentence"'
1. ALWAYS translate the entire input sentence first into ${userLanguage}, placing it in a '<p>' tag with bolded "Translation" in ${userLanguage}.
2. Identify difficult or idiomatic words in the sentence that might benefit understanding (fewer is better).
3. For each such word or phrase, provide a meaning in ${userLanguage}.
4.  Use the following HTML structure:

<p><b>[Translated Sentence in ${userLanguage}]</b></p>
<hr>
<p>[Explanation in ${userLanguage}]</p>
<hr>
<ul>
  <li><b>[Word in original language]:</b> [Meaning in ${userLanguage}]</li>
</ul>

*Note: Always include the full sentence translation first in the first '<p>' tag, and then explanations for multiple relevant expressions if applicable.*

## Examples

### Example 1: Sentence Input (Original language: French, User's language: Japanese)

**User Input:**
'Input: "Il a réussi à convaincre ses collègues malgré les difficultés."'

**Assistant Output:**
<p><b>彼は困難にもかかわらず同僚たちを説得することに成功した。</b></p>
<hr>
<p>この文は、困難な状況の中でも彼が同僚たちを説得することにうまくいった、ということを表しています。</p>
<hr>
<ul>
  <li><b>réussi à:</b> 「~することに成功した」を意味します。</li>
  <li><b>malgré:</b> 「~にもかかわらず」を表します。</li>
</ul>

### Example 2: Sentence Input (Original Language: Italian, User Language: German)

**User Input:**
'Input: "Nonostante la pioggia, siamo andati al concerto."'

**Assistant Output:**
<p><b>Trotz des Regens sind wir zum Konzert gegangen.</b></p>
<hr>
<p>Der Satz beschreibt, dass die Sprecher trotz schlechten Wetters (Regen) das Konzert besucht haben.</p>
<p>Er betont ihre Entschlossenheit oder das Interesse am Konzert.</p>
<hr>
<ul>
  <li><b>Nonostante:</b> Trotz</li>
  <li><b>siamo andati:</b> Wir sind gegangen (Vergangenheit von "gehen")</li>
</ul>
Respond understood if you got it.
`
            const plainTextPrompt = `
Do not use the prompt previously given. For all subsequent turns, the user input will be plain text.
- Input will be given as: 'Plain text input'.
**Plain Text Input (Conversational/Freetext)**
- Respond naturally and directly in ${userLanguage}.
- Avoid structured outputs; adhere to a conversational context.
- DO NOT use the Single Word/Phrase or Sentence formats.

## Examples

### Example 1: Plain Text Input (User Language: English)

**User Input:**
"What's the weather like in London today?"

**Assistant Output:**
<p>I'm sorry, I do not have access to real-time weather information. You can check a reliable weather app or website for the current conditions in London.</p>

### Example 2: Plain Text Input (User Language: French)

**User Input:**
"Peux-tu me raconter une blague courte ?"

**Assistant Output:**
<p>Bien sûr, voici une blague courte :</p>
<p>Pourquoi les poissons vivent-ils dans l'eau salée ? Parce que le poivre les fait éternuer !<p>
Respond understood if you got it.
`

            const ttsInstructions = `
                Accent/Affect: Neutral and clear, like a professional voice-over artist. Focus on accuracy.
                Tone: Objective and methodical. Maintain a slightly formal tone without emotion.
                Pacing: Use distinct pauses between words and phrases to demonstrate pronunciation nuances. Emphasize syllabic clarity.
                Pronunciation: Enunciate words with deliberate clarity, focusing on vowel sounds and consonant clusters.
            `;
            let chatHistory = [];

            function updateReferenceWord(){
                const selection = window.getSelection();
                if (selection.rangeCount === 0) return;

                const referenceWord = targetSectionHead.querySelector(".reference-word");
                const extractedText = extractTextFromDOM(selection.getRangeAt(0).cloneContents());
                if (referenceWord && extractedText && isSentence) {
                    referenceWord.textContent = extractedText;
                }
            }

            function updateChatHistoryState(currentHistory, message, role) {
                return [...currentHistory, { role: role, content: message }];
            }

            function addMessageToUI(message, messageClass, container) {
                const messageDiv = createElement("div", {
                    className: `chat-message ${messageClass}`,
                    innerHTML: message
                });
                container.appendChild(messageDiv);
                container.scrollTop = container.scrollHeight;
            }

            async function getOpenAIResponse(apiKey, model, history) {
                try {
                    const api_url = `https://api.openai.com/v1/chat/completions`;
                    const response = await fetch(
                        api_url,
                        {
                            method: 'POST',
                            headers: {
                                'Content-Type': 'application/json',
                                'Authorization': `Bearer ${apiKey}`
                            },
                            body: JSON.stringify({
                                model: model,
                                messages: history,
                                max_tokens: 500,
                                temperature: 0.7,
                            })
                        }
                    );

                    if (!response.ok) {
                        const errorData = await response.json();
                        console.error('OpenAI API error:', errorData);
                        throw new Error(`OpenAI API error: ${response.status} - ${response.statusText}`);
                    }

                    const data = await response.json();
                    return data.choices[0]?.message?.content || "Sorry, could not get a response.";

                } catch (error) {
                    console.error('OpenAI API call failed:', error);
                    return "Sorry, something went wrong communicating with OpenAI.";
                }
            }

            async function getGoogleResponse(apiKey, model, history) {
                try {
                    const formattedMessages = history.map(msg => ({
                        role: msg.role === 'assistant' ? 'model' : msg.role,
                        parts: [{ text: msg.content }]
                    }));

                    const api_url = `https://generativelanguage.googleapis.com/v1beta/models/${model}:generateContent?key=${apiKey}`;
                    const response = await fetch(
                        api_url,
                        {
                            method: 'POST',
                            headers: { 'Content-Type': 'application/json' },
                            body: JSON.stringify({
                                system_instruction: {parts: [{text: systemPrompt}]},
                                contents: formattedMessages,
                                generationConfig: { temperature: 0.7, maxOutputTokens: 500, ...(model.includes("2.5") ? { thinkingConfig: { thinkingBudget: 0 } } : {})}
                            })
                        }
                    );

                    if (!response.ok) {
                        const errorData = await response.json();
                        console.error('Google Gemini API error:', errorData);
                        const message = errorData?.error?.message || `Google Gemini API error: ${response.status} - ${response.statusText}`;
                        throw new Error(message);
                    }

                    const data = await response.json();
                    return data.candidates[0].content.parts[0].text;
                } catch (error) {
                    console.error('Google Gemini API call failed:', error);
                    return `Sorry, something went wrong communicating with Google. ${error.message || ''}`;
                }
            }

            async function getBotResponse(provider, apiKey, model, history) {
                if (provider === 'openai') {
                    return await getOpenAIResponse(apiKey, model, history);
                } else if (provider === 'google') {
                    return await getGoogleResponse(apiKey, model, history);
                }
            }

            async function handleSendMessage() {
                const userInput = document.getElementById("user-input")
                const chatContainer = document.getElementById("chat-container")

                const message = userInput.value.trim();
                if (!message) return;

                const userMessage = message;
                userInput.value = '';

                addMessageToUI(userMessage, 'user-message', chatContainer);
                chatHistory = updateChatHistoryState(chatHistory, userMessage, "user");

                addMessageToUI("loading ...", 'loading-message', chatContainer);
                const botResponse = await getBotResponse(llmProvider, llmApiKey, llmModel, chatHistory);
                chatContainer.removeChild(chatContainer.lastChild);

                addMessageToUI(botResponse, 'bot-message', chatContainer);
                chatHistory = updateChatHistoryState(chatHistory, botResponse, "assistant");
            }

            function getSelectedWithContext() {
                const selectedTextElement = targetSectionHead.querySelector(".reference-word");
                const contextElement = (document.querySelector("span.selected-text, span.is-selected") || {}).parentElement || null;
                const selectedText = selectedTextElement ? selectedTextElement.textContent.trim() : "";
                const contextText = contextElement ? contextElement.innerText.trim() : "";

                return `Input: "${selectedText}"` +  (!isSentence ? `, Context: "${contextText}"` : ``);
            }

            async function updateChatWidget(){
                if (!settings.chatWidget) return;

                const chatWrapper = createElement("div", { id: "chat-widget", style: "margin-top: 5px 0 10px;" });
                const chatContainer = createElement("div", { id: "chat-container" });
                const inputContainer = createElement("div", { className: "input-container" });
                const userInput = createElement("input", { type: "text", id: "user-input", placeholder: "Ask anything" });
                const sendButton = createElement("button", { id: "send-button", textContent: "Send" });

                inputContainer.appendChild(userInput);
                inputContainer.appendChild(sendButton);
                chatWrapper.appendChild(chatContainer);
                chatWrapper.appendChild(inputContainer);

                const existingChatWidget = document.getElementById('chat-widget');
                if(existingChatWidget) {
                    existingChatWidget.replaceWith(chatWrapper);
                } else {
                    if (targetSectionHead.matches(".section-widget--head")) {
                        targetSectionHead.appendChild(chatWrapper);
                    } else {
                        targetSectionHead.prepend(chatWrapper);
                    }

                }

                changeScrollAmount("#chat-container", 0.2)
                userInput.addEventListener('keydown', (event) => {
                    if (event.key === 'Enter') {
                        event.preventDefault();
                        handleSendMessage();
                    } else if (event.key === 'Escape') {
                        event.preventDefault();
                        event.target.blur();
                    }
                    event.stopPropagation();
                }, true);
                sendButton.addEventListener('click', handleSendMessage);

                if (llmProvider === 'openai') chatHistory = updateChatHistoryState(chatHistory, systemPrompt, "system");

                if (settings.askSelected && targetSectionHead.matches(".section-widget--head")) {
                    const initialUserMessage = getSelectedWithContext();
                    chatHistory = updateChatHistoryState(chatHistory, !isSentence ? wordPhrasePrompt: sentencePrompt, "user");
                    chatHistory = updateChatHistoryState(chatHistory, "Understood.", "assistant");

                    chatHistory = updateChatHistoryState(chatHistory, initialUserMessage, "user");
                    addMessageToUI("loading ...", 'loading-message', chatContainer);
                    const botResponse = await getBotResponse(llmProvider, llmApiKey, llmModel, chatHistory);
                    chatContainer.removeChild(chatContainer.lastChild);
                    addMessageToUI(botResponse, 'bot-message', chatContainer);
                    chatHistory = updateChatHistoryState(chatHistory, botResponse, "assistant");

                    chatHistory = updateChatHistoryState(chatHistory, plainTextPrompt, "user");
                    chatHistory = updateChatHistoryState(chatHistory, "Understood.", "assistant");

                    const meaning = document.querySelector("#chat-container > .bot-message > p");
                    if (meaning) {
                        const hasMeaning = document.querySelector(".reference-input-text").value;
                        navigator.clipboard.writeText((hasMeaning ? '\n': '') + meaning.textContent);
                        showToast("Meaning Copied!");
                    }
                }
            }

            async function updateTTS() {
                if (!settings.tts) return;

                const ttsButton = await waitForElement('.is-tts');
                const isWord = document.querySelector("span.selected-text, span.is-selected");
                if (!settings.ttsSentence && !isWord) {
                    ttsButton.click();
                    return;
                }
                if (!settings.ttsWord && isWord) {
                    ttsButton.click();
                    return;
                }

                const selectedTextElement = document.querySelector(".reference-word");
                const selectedText = selectedTextElement ? selectedTextElement.textContent.trim() : "";
                if (selectedText.length > 1000) return;

                let audioData = await openAITTS(`${selectedText}`, settings.ttsApiKey, settings.ttsVoice, 1.0, ttsInstructions);
                if (audioData == null) return;

                const newTtsButton = createElement("button", {id: "playAudio", textContent: "🔊", className: "is-tts"});
                newTtsButton.addEventListener('click', async (event) => {
                    await playAudio(audioData, 0.7);
                })
                ttsButton.replaceWith(newTtsButton);

                playAudio(audioData, 0.7);
            }

            updateReferenceWord();
            updateChatWidget();
            updateTTS();

            const selectedTextElement = targetSectionHead.querySelector(".reference-word");
            if (selectedTextElement){
                const observer = new MutationObserver((mutations) => {
                    mutations.forEach((mutation) => {
                        if (mutation.type !== 'characterData') return;
                        updateReferenceWord();
                        updateChatWidget();
                        updateTTS();
                    });
                });
                observer.observe(selectedTextElement, {subtree: true, characterData: true});
            }
        }

        const userDictionaryLang = await getDictionaryLanguage();
        const DictionaryLocalePairs = await getDictionaryLocalePairs()
        const userLanguage = DictionaryLocalePairs[userDictionaryLang];
        const lessonReader = document.getElementById('lesson-reader');

        const observer = new MutationObserver((mutations) => {
            if (!settings.chatWidget) return;

            mutations.forEach((mutation) => {
                mutation.addedNodes.forEach((node) => {
                    if (node.nodeType !== Node.ELEMENT_NODE) return;

                    if (node.matches(".widget-area")) {
                        updateWidget();
                    }
                });
            });
        });
        observer.observe(lessonReader, {childList: true});
    }

    async function setupCourse() {
        function createCourseUI(){
            const resetButton = createElement("button", {
                id: "resetLessonPositions",
                textContent: "⏮️",
                title: "Reset all lessons to the first page",
                className: "nav-button"
            });

            let nav = document.querySelector(".library-section > .list-header > .list-header-index");
            nav.appendChild(resetButton);
        }

        function setupCourseStyles() {
            const css = `
            .nav-button {
                background: none;
                border: none;
                cursor: pointer;
                font-size: 1.5rem;
            }

            .library-section > .list-header > .list-header-index {
                grid-template-columns: auto 1fr auto !important;
            }

            .dynamic--word-progress {
                grid-template-columns: repeat(3, auto) !important;
            }

            .word-indicator--box-white {
                background-color: rgb(255 255 255 / 85%);
                border-color: rgb(255 255 255);
            }
            `;
            const styleElement = createElement("style", { textContent: css });
            document.querySelector("head").appendChild(styleElement);
        }

        function enrichLessonDetails() {
            function addKnownWordsIndicator(lessonElement, lessonInfo) {
                const dynamicWordProgress = lessonElement.querySelector('.dynamic--word-progress');

                const knownWordPercentage = Math.round((lessonInfo.knownWordsCount / lessonInfo.uniqueWordsCount) * 100);

                const knownWordsItem = createElement('div', {className: 'word-indicator--item grid-layout grid-align--center grid-item is-fluid--left', title: 'Known Words'});

                const knownWordsBox = createElement('div', {className: 'word-indicator--box word-indicator--box-white'});
                knownWordsItem.appendChild(knownWordsBox);

                const textWrapper = createElement('span', {className: 'text-wrapper is-size-8'});
                textWrapper.appendChild(createElement('span', {textContent: `${lessonInfo.knownWordsCount} (${knownWordPercentage}%)`}));

                knownWordsItem.appendChild(textWrapper);
                dynamicWordProgress.appendChild(knownWordsItem);
            }

            async function updateWordIndicatorPercentages(lessonElement, lessonId) {
                console.log(`lessonId: ${lessonId}`);
                const lessonInfo = await getLessonInfo(lessonId);

                const wordIndicatorItems = lessonElement.querySelector(".word-indicator--item");
                if (!wordIndicatorItems) { return; }

                const lingqsPercentage = Math.round((lessonInfo.cardsCount / lessonInfo.uniqueWordsCount) * 100);
                const lingqsElement = lessonElement.querySelector('.word-indicator--item[title="LingQs"] > span > span');
                lingqsElement.textContent = `${lessonInfo.cardsCount} (${lingqsPercentage}%)`;

                addKnownWordsIndicator(lessonElement, lessonInfo);
            }

            const observer = new MutationObserver((mutations) => {
                mutations.forEach((mutation) => {
                    if (mutation.type === 'childList' && mutation.addedNodes.length > 0) {
                        mutation.addedNodes.forEach((node) => {
                            if (node.matches('.library-item-wrap')) {
                                const lessonId = node.id.split("--")[1].split("-")[0];
                                updateWordIndicatorPercentages(node, lessonId);
                            }
                        });
                    }
                });
            });

            const targetNode = document.querySelector('.library-section .library-list');
            console.log(targetNode);
            const config = { childList: true, subtree: true };
            observer.observe(targetNode, config);
        }

        function enableCourseSorting() {
            const dropdownItems = document.querySelectorAll('.library-section > .list-header .tw-dropdown--item');
            if (dropdownItems.length) {
                // Setup library sort event listener
                dropdownItems.forEach((item, index) => {
                    item.addEventListener('click', () => {
                        console.log(`Clicked sort option: ${index}`);
                        storage.set('librarySortOption', index);
                        settings.librarySortOption = index;
                    });
                });

                // Change sort by the setting
                dropdownItems[settings.librarySortOption].click();
                return true;
            } else {
                console.warn("Dropdown items not found for library sort.");
                return false;
            }
        }

        function setupLessonResetButton() {
            const resetButton = document.getElementById("resetLessonPositions");
            resetButton.addEventListener("click", async () => {
                const languageCode = await getLanguageCode();
                const collectionId = await getCollectionId();

                const allLessons = await getAllLessons(languageCode, collectionId);
                const confirmed = confirm(`Reset all ${allLessons.length} lessons to their starting positions?`);
                if (!confirmed) { return; }

                for (const lesson of allLessons) {
                    await setLessonProgress(lesson.id, 0);
                    console.log(`Reset lesson ID: ${lesson.id} to the first page`);
                }

                alert(`Successfully reset ${allLessons.length} lessons to their starting positions.`);
            });
        }

        const libraryHeader = await waitForElement('.library-section > .list-header');
        createCourseUI();
        setupCourseStyles();

        enrichLessonDetails();
        enableCourseSorting();
        setupLessonResetButton();
    }

    function fixBugs() {
        const resizeToast = () => {
            const css = `
            .toasts {
                height: fit-content;
            }
            `;
            const cssElement = createElement("style", {textContent: css});
            document.querySelector("head").appendChild(cssElement);
        }

        resizeToast();
    }

    function init() {
        fixBugs();

        if (document.URL.includes("reader")) {
            createUI();
            applyStyles(settings.styleType, settings.colorMode);
            setupKeyboardShortcuts();
            setupYoutubePlayerCustomization();
            changeScrollAmount(".reader-container", 0.3);
            setupSentenceFocus();
            setupLLMs();
        }
        if (document.URL.includes("library")) {
            setupCourse();
        }
    }

    init();
})();

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