sequoia00
/
reader_pro


			
				
					
						
						
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							<!DOCTYPE html>
<html dir="ltr" mozdisallowselectionprint>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <meta name="google" content="notranslate">
    <title>PDF.js viewer</title>

    <link rel="resource" type="application/l10n" href="locale/locale.json">
    <script src="../build/pdf.mjs" type="module"></script>
    <link rel="stylesheet" href="viewer.css">
    <script>
        (function () {
            const NIGHT_MODE_STORAGE_KEY = 'reader_pro.night_mode';
            const PDFJS_PREFERENCES_KEY = 'pdfjs.preferences';
            const nightModeEnabled = localStorage.getItem(NIGHT_MODE_STORAGE_KEY) === '1';
            let preferences = {};

            try {
                preferences = JSON.parse(localStorage.getItem(PDFJS_PREFERENCES_KEY)) || {};
            } catch (e) {
                preferences = {};
            }

            preferences.forcePageColors = nightModeEnabled;
            preferences.pageColorsBackground = '#0b0b0b';
            preferences.pageColorsForeground = '#f5f5f5';

            localStorage.setItem(PDFJS_PREFERENCES_KEY, JSON.stringify(preferences));
        })();
    </script>
    <script src="viewer.mjs" type="module"></script>

    <style>
        /* 模态窗口样式 */
        .modal {
            display: none;
            position: fixed;
            z-index: 10002;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 90%;
            max-width: 500px;
            background-color: white;
            border: 1px solid #ccc;
            border-radius: 5px;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            max-height: 80vh;
            overflow-y: auto;
        }

        .modal-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 10001;
        }

        .button {
            padding: 4px 6px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 11px;
            margin: 0 2px;
            flex: 1;
            text-align: center;
            white-space: nowrap;
        }

        .button-secondary {
            background-color: #6c757d;
        }

        .button-success {
            background-color: #28a745;
        }

        .button-light {
            background-color: #ded520;
            color: black;
        }

        .button-danger {
            background-color: #dc3545;
        }

        .button-pause {
            background-color: #ffc107;
            color: black;
        }

        .button-stop {
            background-color: #dc3545;
        }

        .button-night {
            background-color: #1f2937;
            color: #f9fafb;
        }

        :root {
            --reader-controls-size: 32px;
            --reader-controls-gap: 5px;
            --reader-controls-radius: 12px;
            --reader-controls-padding: 6px;
            --reader-controls-surface: rgba(255, 255, 255, 0.96);
            --reader-controls-border: rgba(15, 23, 42, 0.08);
            --reader-controls-icon: 14px;
            --reader-controls-font: 9px;
            --reader-controls-label: none;
        }

        body.reader-size-xsmall {
            --reader-controls-size: 24px;
            --reader-controls-gap: 4px;
            --reader-controls-padding: 4px;
            --reader-controls-radius: 9px;
            --reader-controls-icon: 12px;
            --reader-controls-font: 0;
            --reader-controls-label: none;
        }

        body.reader-size-medium {
            --reader-controls-size: 40px;
            --reader-controls-gap: 6px;
            --reader-controls-radius: 13px;
            --reader-controls-padding: 7px;
            --reader-controls-icon: 16px;
            --reader-controls-font: 9px;
        }

        body.reader-size-large {
            --reader-controls-size: 46px;
            --reader-controls-gap: 7px;
            --reader-controls-radius: 15px;
            --reader-controls-padding: 8px;
            --reader-controls-icon: 18px;
            --reader-controls-font: 10px;
        }

        #mainContainer {
            display: grid;
            grid-template-columns: minmax(0, 1fr);
            grid-template-rows: auto minmax(0, 1fr);
            min-height: 100%;
        }

        #readerWorkspace {
            display: grid;
            grid-template-columns: minmax(68px, auto) minmax(0, 1fr);
            grid-template-rows: minmax(0, 1fr);
            align-items: stretch;
            min-height: 0;
            min-width: 0;
            background: linear-gradient(180deg, rgba(248, 250, 252, 0.9), rgba(241, 245, 249, 0.72));
        }

        #viewerContainer {
            min-width: 0;
            min-height: 0;
            overflow: auto;
            background: #eef2f7;
        }

        #readerControls {
            display: flex;
            flex-direction: column;
            gap: var(--reader-controls-gap);
            padding: var(--reader-controls-padding);
            background: var(--reader-controls-surface);
            position: relative;
            border-right: 1px solid var(--reader-controls-border);
            box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.7);
            backdrop-filter: blur(14px);
            z-index: 5;
            align-self: stretch;
            justify-content: flex-start;
            align-items: stretch;
            flex-shrink: 0;
            width: calc(var(--reader-controls-size) + var(--reader-controls-padding) * 2);
            box-sizing: border-box;
            height: calc(100vh - var(--toolbar-height));
            min-height: 0;
        }

        #readerControls.collapsed {
            padding: 10px 8px;
            gap: 6px;
        }

        body.reader-position-left #readerControls.collapsed,
        body.reader-position-right #readerControls.collapsed {
            width: 0;
            padding: 0;
            border: 0;
            box-shadow: none;
            overflow: visible;
        }

        #readerControls.collapsed .reader-tool:not(.reader-tool-collapse),
        #readerControls.collapsed .reader-settings-launcher {
            display: none;
        }

        #readerControls.collapsed #readerControlsSpacer,
        #readerControls.collapsed .reader-tools,
        #readerControls.collapsed .reader-settings-anchor {
            display: none;
        }

        #readerControls.collapsed .reader-tool-collapse {
            position: fixed;
            top: 0;
            left: 0;
            z-index: 30;
            display: inline-flex;
            box-shadow: 0 8px 24px rgba(15, 23, 42, 0.18);
        }

        body.reader-controls-collapsed #sidebarContainer {
            display: none;
        }

        body.reader-controls-collapsed #outerContainer.sidebarOpen #viewerContainer:not(.pdfPresentationMode) {
            inset-inline-start: 0;
        }

        .reader-tools {
            display: flex;
            gap: var(--reader-controls-gap);
            flex: 0 0 auto;
            min-width: 0;
        }

        .reader-tools {
            flex-direction: column;
            align-items: flex-start;
        }

        .reader-tool,
        .reader-settings-launcher {
            width: var(--reader-controls-size);
            min-width: var(--reader-controls-size);
            height: var(--reader-controls-size);
            box-sizing: border-box;
            border: 1px solid rgba(15, 23, 42, 0.12);
            border-radius: calc(var(--reader-controls-radius) - 4px);
            background: rgba(255, 255, 255, 0.88);
            color: #0f172a;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: background-color 120ms ease, border-color 120ms ease, transform 120ms ease;
            box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
            padding: 0;
        }

        #readerControls > .reader-tool,
        #readerControls > .reader-settings-launcher,
        .reader-tools > .reader-tool {
            flex: 0 0 auto;
            justify-content: center;
        }

        .reader-tool:hover,
        .reader-settings-launcher:hover {
            background: #f8fafc;
            border-color: rgba(15, 23, 42, 0.2);
        }

        .reader-tool:active,
        .reader-settings-launcher:active {
            transform: translateY(1px);
        }

        .reader-tool.is-active {
            background: #e2e8f0;
            border-color: rgba(15, 23, 42, 0.22);
        }

        .reader-tool.reader-tool-danger {
            color: #b91c1c;
        }

        .reader-tool.reader-tool-accent {
            color: #166534;
        }

        .reader-tool svg,
        .reader-settings-launcher svg {
            width: var(--reader-controls-icon);
            height: var(--reader-controls-icon);
            stroke: currentColor;
            fill: none;
            stroke-width: 1.8;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        #select-all-text svg {
            width: calc(var(--reader-controls-icon) + 2px);
            height: calc(var(--reader-controls-icon) + 2px);
        }

        .reader-tool-label {
            display: var(--reader-controls-label);
        }

        .reader-tool-stack {
            display: inline-flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            font-size: var(--reader-controls-font);
            line-height: 1;
            letter-spacing: 0.02em;
        }

        #readerControlsSpacer {
            display: none;
            flex: 0 0 auto;
            min-width: 8px;
            min-height: 8px;
        }

        .reader-settings-anchor {
            position: relative;
            align-self: flex-start;
            flex: 0 0 auto;
        }

        body.reader-position-right #readerControls {
            order: 2;
            border-right: none;
            border-left: 1px solid var(--reader-controls-border);
            box-shadow: inset 1px 0 0 rgba(255, 255, 255, 0.7);
        }

        body.reader-position-right #readerControls.collapsed .reader-tool-collapse {
            left: auto;
            right: 0;
        }

        .reader-settings-panel {
            display: none;
            position: absolute;
            top: calc(100% + 8px);
            left: 0;
            width: min(320px, calc(100vw - 24px));
            padding: 14px;
            background: rgba(255, 255, 255, 0.98);
            border: 1px solid rgba(15, 23, 42, 0.1);
            border-radius: 18px;
            box-shadow: 0 18px 40px rgba(15, 23, 42, 0.16);
            z-index: 20;
        }

        #readerControls.settings-open .reader-settings-panel {
            display: block;
        }

        body.reader-position-right .reader-settings-panel {
            top: calc(100% + 8px);
        }

        body.reader-position-top .reader-settings-panel {
            top: calc(100% + 8px);
        }

        body.reader-position-bottom .reader-settings-panel {
            top: calc(100% + 8px);
        }

        .reader-settings-title {
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 12px;
            color: #0f172a;
        }

        .reader-settings-group {
            margin-bottom: 14px;
        }

        .reader-settings-group:last-child {
            margin-bottom: 0;
        }

        .reader-settings-label {
            display: block;
            font-size: 11px;
            font-weight: 700;
            color: #475569;
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }

        .reader-settings-options {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .reader-settings-options.reader-settings-options-column {
            flex-direction: column;
            align-items: stretch;
        }

        .reader-settings-option {
            border: 1px solid rgba(15, 23, 42, 0.12);
            background: #fff;
            border-radius: 999px;
            font-size: 12px;
            color: #0f172a;
            padding: 6px 10px;
            cursor: pointer;
        }

        .reader-settings-option.is-selected {
            background: #0f172a;
            color: #fff;
            border-color: #0f172a;
        }

        .reader-settings-toggle {
            width: 100%;
            justify-content: space-between;
            align-items: center;
            padding-inline: 12px;
        }

        .reader-highlight-colors {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .reader-highlight-color {
            width: 28px;
            height: 28px;
            border-radius: 999px;
            border: 2px solid rgba(15, 23, 42, 0.16);
            cursor: pointer;
            padding: 0;
            background: var(--swatch-color);
            box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.75);
        }

        .reader-highlight-color.is-selected {
            border-color: #0f172a;
            box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.12), inset 0 0 0 1px rgba(255, 255, 255, 0.85);
        }

        /* 顶部状态条 */
        #loading-indicator {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(0, 0, 0, 0.7);
            color: #fff;
            padding: 5px 10px;
            font-size: 12px;
            z-index: 1000;
            text-align: center;
        }

        /* 右上角用户菜单 */
        .user-menu {
            position: fixed;
            top: 35px;
            right: 20px;
            z-index: 10005;
            font-size: 13px;
            user-select: none;
        }
        .user-menu-trigger {
            border: none;
            border-radius: 18px;
            padding: 7px 12px;
            background: rgba(255, 255, 255, 0.96);
            color: #0f172a;
            box-shadow: 0 3px 14px rgba(0, 0, 0, 0.14);
            cursor: pointer;
            font-weight: 600;
        }
        .user-menu-panel {
            display: none;
            margin-top: 8px;
            min-width: 160px;
            background: #fff;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            box-shadow: 0 10px 28px rgba(2, 8, 23, 0.2);
            overflow: hidden;
        }
        .user-menu.open .user-menu-panel {
            display: block;
        }
        .user-menu-item {
            width: 100%;
            text-align: left;
            border: none;
            background: #fff;
            padding: 10px 12px;
            cursor: pointer;
            color: #0f172a;
        }
        .user-menu-item:hover {
            background: #f8fafc;
        }

        /* 音频播放器 */
        #audio-player {
            display: none; /* 隐藏默认音频控件，改用自定义按钮 */
        }

        .tts-progress-highlight {
            pointer-events: none;
        }

        /* 目录分页样式 */
        #pdfList {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        #pdfList li {
            margin-bottom: 10px;
            word-break: break-all;
        }

        #pdfList a {
            text-decoration: none;
            color: #007bff;
            display: block;
            padding: 5px;
        }

        .pagination {
            display: flex;
            justify-content: space-between;
            margin-top: 20px;
        }

        .pagination button {
            padding: 5px 10px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 14px;
        }

        .pagination button:disabled {
            background-color: #6c757d;
            cursor: not-allowed;
        }

        body.night-reading-mode {
            background: #0b1220;
        }

        body.night-reading-mode #viewerContainer {
            background: #0f172a;
        }

        body.night-reading-mode .toolbar,
        body.night-reading-mode #loading-indicator,
        body.night-reading-mode .user-menu-trigger,
        body.night-reading-mode .user-menu-panel,
        body.night-reading-mode .modal,
        body.night-reading-mode #readerControls,
        body.night-reading-mode .reader-settings-panel {
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.45);
        }

        body.night-reading-mode #readerWorkspace {
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.9));
        }

        body.night-reading-mode #readerControls,
        body.night-reading-mode .reader-settings-panel {
            background: rgba(15, 23, 42, 0.96);
            border-color: rgba(148, 163, 184, 0.16);
        }

        body.night-reading-mode .reader-tool,
        body.night-reading-mode .reader-settings-launcher,
        body.night-reading-mode .reader-settings-option {
            background: rgba(30, 41, 59, 0.92);
            color: #e2e8f0;
            border-color: rgba(148, 163, 184, 0.16);
        }

        body.night-reading-mode .reader-tool.is-active,
        body.night-reading-mode .reader-settings-option.is-selected {
            background: #e2e8f0;
            color: #0f172a;
            border-color: #e2e8f0;
        }

        body.night-reading-mode .reader-settings-title,
        body.night-reading-mode .reader-settings-label {
            color: #e2e8f0;
        }

        body.night-reading-mode .pdfViewer .page {
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.55);
        }

        /* 手机端优化 */
        @media (max-width: 768px) {
            .modal {
                width: 95%;
                padding: 10px;
            }

            .button {
                font-size: 10px;
                padding: 4px 4px;
                margin: 0 2px;
            }

            #readerControls {
                --reader-controls-padding: 7px;
                --reader-controls-gap: 5px;
            }

            #loading-indicator {
                font-size: 10px;
                padding: 3px 5px;
            }

            .reader-settings-panel {
                width: min(280px, calc(100vw - 20px));
            }
        }
    </style>
</head>

<body tabindex="0">
    <div id="loading-indicator"></div>
    <div id="userMenu" class="user-menu">
        <button id="userMenuTrigger" class="user-menu-trigger" type="button">用户</button>
        <div id="userMenuPanel" class="user-menu-panel">
            <button id="userAdminBtn" class="user-menu-item" type="button" style="display:none;">管理员面板</button>
            <button id="userLogoutBtn" class="user-menu-item" type="button">退出登录</button>
        </div>
    </div>

    <audio id="audio-player" controls></audio>

    <input type="file" id="pdfInput" accept="application/pdf" style="display: none;" />

    <div id="filenameModal" class="modal">
        <h3>输入保存的文件名</h3>
        <input type="text" id="customFileName" placeholder="不含扩展名"
            style="width: 100%; padding: 5px; margin-top: 10px;" />
        <div style="margin-top: 20px; text-align: right;">
            <button id="cancelUpload" class="button button-secondary">取消</button>
            <button id="confirmUpload" class="button button-success" style="margin-left: 10px;">确认</button>
        </div>
    </div>

    <div id="directoryModal" class="modal">
        <h2>已上传的 PDF 文档</h2>
        <ul id="pdfList"></ul>
        <div class="pagination">
            <button id="prevPage" disabled>上一页</button>
            <span id="pageInfo"></span>
            <button id="nextPage" disabled>下一页</button>
        </div>
        <button id="closeDirectoryButton" class="button button-danger"
            style="margin-top: 20px; width: 100%;">关闭</button>
    </div>

    <div id="modalOverlay" class="modal-overlay"></div>

    <div id="outerContainer">
        <div id="sidebarContainer">
            <div id="toolbarSidebar" class="toolbarHorizontalGroup">
                <div id="toolbarSidebarLeft">
                    <div id="sidebarViewButtons" class="toolbarHorizontalGroup toggled" role="radiogroup">
                        <button id="viewThumbnail" class="toolbarButton toggled" type="button"
                            title="Show Thumbnails" tabindex="0" data-l10n-id="pdfjs-thumbs-button" role="radio"
                            aria-checked="true" aria-controls="thumbnailView">
                            <span data-l10n-id="pdfjs-thumbs-button-label">Thumbnails</span>
                        </button>
                        <button id="viewOutline" class="toolbarButton" type="button"
                            title="Show Document Outline (double-click to expand/collapse all items)" tabindex="0"
                            data-l10n-id="pdfjs-document-outline-button" role="radio" aria-checked="false"
                            aria-controls="outlineView">
                            <span data-l10n-id="pdfjs-document-outline-button-label">Document Outline</span>
                        </button>
                        <button id="viewAttachments" class="toolbarButton" type="button" title="Show Attachments"
                            tabindex="0" data-l10n-id="pdfjs-attachments-button" role="radio" aria-checked="false"
                            aria-controls="attachmentsView">
                            <span data-l10n-id="pdfjs-attachments-button-label">Attachments</span>
                        </button>
                        <button id="viewLayers" class="toolbarButton" type="button"
                            title="Show Layers (double-click to reset all layers to the default state)" tabindex="0"
                            data-l10n-id="pdfjs-layers-button" role="radio" aria-checked="false"
                            aria-controls="layersView">
                            <span data-l10n-id="pdfjs-layers-button-label">Layers</span>
                        </button>
                    </div>
                </div>
                <div id="toolbarSidebarRight">
                    <div id="outlineOptionsContainer" class="toolbarHorizontalGroup">
                        <div class="verticalToolbarSeparator"></div>
                        <button id="currentOutlineItem" class="toolbarButton" type="button" disabled="disabled"
                            title="Find Current Outline Item" tabindex="0"
                            data-l10n-id="pdfjs-current-outline-item-button">
                            <span data-l10n-id="pdfjs-current-outline-item-button-label">Current Outline Item</span>
                        </button>
                    </div>
                </div>
            </div>
            <div id="sidebarContent">
                <div id="thumbnailView"></div>
                <div id="outlineView" class="hidden"></div>
                <div id="attachmentsView" class="hidden"></div>
                <div id="layersView" class="hidden"></div>
            </div>
            <div id="sidebarResizer"></div>
        </div>

        <div id="mainContainer">
            <div class="toolbar">
                <div id="toolbarContainer">
                    <div id="toolbarViewer" class="toolbarHorizontalGroup">
                        <div id="toolbarViewerLeft" class="toolbarHorizontalGroup">
                            <button id="sidebarToggleButton" class="toolbarButton" type="button"
                                title="Toggle Sidebar" tabindex="0" data-l10n-id="pdfjs-toggle-sidebar-button"
                                aria-expanded="false" aria-haspopup="true" aria-controls="sidebarContainer">
                                <span data-l10n-id="pdfjs-toggle-sidebar-button-label">Toggle Sidebar</span>
                            </button>
                            <div class="toolbarButtonSpacer"></div>
                            <div class="toolbarButtonWithContainer">
                                <button id="viewFindButton" class="toolbarButton" type="button"
                                    title="Find in Document" tabindex="0" data-l10n-id="pdfjs-findbar-button"
                                    aria-expanded="false" aria-controls="findbar">
                                    <span data-l10n-id="pdfjs-findbar-button-label">Find</span>
                                </button>
                                <div class="hidden doorHanger toolbarHorizontalGroup" id="findbar">
                                    <div id="findInputContainer" class="toolbarHorizontalGroup">
                                        <span class="loadingInput end toolbarHorizontalGroup">
                                            <input id="findInput" class="toolbarField" title="Find"
                                                placeholder="Find in document…" tabindex="0"
                                                data-l10n-id="pdfjs-find-input" aria-invalid="false">
                                        </span>
                                        <div class="toolbarHorizontalGroup">
                                            <button id="findPreviousButton" class="toolbarButton" type="button"
                                                title="Find the previous occurrence of the phrase" tabindex="0"
                                                data-l10n-id="pdfjs-find-previous-button">
                                                <span
                                                    data-l10n-id="pdfjs-find-previous-button-label">Previous</span>
                                            </button>
                                            <div class="splitToolbarButtonSeparator"></div>
                                            <button id="findNextButton" class="toolbarButton" type="button"
                                                title="Find the next occurrence of the phrase" tabindex="0"
                                                data-l10n-id="pdfjs-find-next-button">
                                                <span data-l10n-id="pdfjs-find-next-button-label">Next</span>
                                            </button>
                                        </div>
                                    </div>
                                    <div id="findbarOptionsOneContainer" class="toolbarHorizontalGroup">
                                        <div class="toggleButton toolbarLabel">
                                            <input type="checkbox" id="findHighlightAll" tabindex="0" />
                                            <label for="findHighlightAll"
                                                data-l10n-id="pdfjs-find-highlight-checkbox">Highlight All</label>
                                        </div>
                                        <div class="toggleButton toolbarLabel">
                                            <input type="checkbox" id="findMatchCase" tabindex="0" />
                                            <label for="findMatchCase"
                                                data-l10n-id="pdfjs-find-match-case-checkbox-label">Match
                                                Case</label>
                                        </div>
                                    </div>
                                    <div id="findbarOptionsTwoContainer" class="toolbarHorizontalGroup">
                                        <div class="toggleButton toolbarLabel">
                                            <input type="checkbox" id="findMatchDiacritics" tabindex="0" />
                                            <label for="findMatchDiacritics"
                                                data-l10n-id="pdfjs-find-match-diacritics-checkbox-label">Match
                                                Diacritics</label>
                                        </div>
                                        <div class="toggleButton toolbarLabel">
                                            <input type="checkbox" id="findEntireWord" tabindex="0" />
                                            <label for="findEntireWord"
                                                data-l10n-id="pdfjs-find-entire-word-checkbox-label">Whole
                                                Words</label>
                                        </div>
                                    </div>
                                    <div id="findbarMessageContainer" class="toolbarHorizontalGroup"
                                        aria-live="polite">
                                        <span id="findResultsCount" class="toolbarLabel"></span>
                                        <span id="findMsg" class="toolbarLabel"></span>
                                    </div>
                                </div>
                            </div>
                            <div class="toolbarHorizontalGroup hiddenSmallView">
                                <button class="toolbarButton" title="Previous Page" type="button" id="previous"
                                    tabindex="0" data-l10n-id="pdfjs-previous-button">
                                    <span data-l10n-id="pdfjs-previous-button-label">Previous</span>
                                </button>
                                <div class="splitToolbarButtonSeparator"></div>
                                <button class="toolbarButton" type="button" title="Next Page" id="next" tabindex="0"
                                    data-l10n-id="pdfjs-next-button">
                                    <span data-l10n-id="pdfjs-next-button-label">Next</span>
                                </button>
                            </div>
                            <div class="toolbarHorizontalGroup">
                                <span class="loadingInput start toolbarHorizontalGroup">
                                    <input type="number" id="pageNumber" class="toolbarField" title="Page" value="1"
                                        min="1" tabindex="0" data-l10n-id="pdfjs-page-input" autocomplete="off">
                                </span>
                                <span id="numPages" class="toolbarLabel"></span>
                            </div>
                        </div>
                        <div id="toolbarViewerMiddle" class="toolbarHorizontalGroup">
                            <div class="toolbarHorizontalGroup">
                                <button id="zoomOutButton" class="toolbarButton" type="button" title="Zoom Out"
                                    tabindex="0" data-l10n-id="pdfjs-zoom-out-button">
                                    <span data-l10n-id="pdfjs-zoom-out-button-label">Zoom Out</span>
                                </button>
                                <div class="splitToolbarButtonSeparator"></div>
                                <button id="zoomInButton" class="toolbarButton" type="button" title="Zoom In"
                                    tabindex="0" data-l10n-id="pdfjs-zoom-in-button">
                                    <span data-l10n-id="pdfjs-zoom-in-button-label">Zoom In</span>
                                </button>
                            </div>
                            <span id="scaleSelectContainer" class="dropdownToolbarButton">
                                <select id="scaleSelect" title="Zoom" tabindex="0" data-l10n-id="pdfjs-zoom-select">
                                    <option id="pageAutoOption" title="" value="auto" selected="selected"
                                        data-l10n-id="pdfjs-page-scale-auto">Automatic Zoom</option>
                                    <option id="pageActualOption" title="" value="page-actual"
                                        data-l10n-id="pdfjs-page-scale-actual">
                                        Actual Size</option>
                                    <option id="pageFitOption" title="" value="page-fit"
                                        data-l10n-id="pdfjs-page-scale-fit">Page Fit
                                    </option>
                                    <option id="pageWidthOption" title="" value="page-width"
                                        data-l10n-id="pdfjs-page-scale-width">Page
                                        Width</option>
                                    <option id="customScaleOption" title="" value="custom" disabled="disabled"
                                        hidden="true" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 0 }'>0%</option>
                                    <option title="" value="0.5" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 50 }'>
                                        50%</option>
                                    <option title="" value="0.75" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 75 }'>
                                        75%</option>
                                    <option title="" value="1" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 100 }'>
                                        100%</option>
                                    <option title="" value="1.25" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 125 }'>
                                        125%</option>
                                    <option title="" value="1.5" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 150 }'>
                                        150%</option>
                                    <option title="" value="2" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 200 }'>
                                        200%</option>
                                    <option title="" value="3" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 300 }'>
                                        300%</option>
                                    <option title="" value="4" data-l10n-id="pdfjs-page-scale-percent"
                                        data-l10n-args='{ "scale": 400 }'>
                                        400%</option>
                                </select>
                            </span>
                        </div>
                        <div id="toolbarViewerRight" class="toolbarHorizontalGroup">
                            <div id="editorModeButtons" class="toolbarHorizontalGroup" role="radiogroup">
                                <div id="editorHighlight" class="toolbarButtonWithContainer">
                                    <button id="editorHighlightButton" class="toolbarButton" type="button"
                                        disabled="disabled" title="Highlight" role="radio" aria-expanded="false"
                                        aria-haspopup="true" aria-controls="editorHighlightParamsToolbar"
                                        tabindex="0" data-l10n-id="pdfjs-editor-highlight-button">
                                        <span data-l10n-id="pdfjs-editor-highlight-button-label">Highlight</span>
                                    </button>
                                    <div class="editorParamsToolbar hidden doorHangerRight"
                                        id="editorHighlightParamsToolbar">
                                        <div id="highlightParamsToolbarContainer"
                                            class="editorParamsToolbarContainer">
                                            <div id="editorHighlightColorPicker" class="colorPicker">
                                                <span id="highlightColorPickerLabel" class="editorParamsLabel"
                                                    data-l10n-id="pdfjs-editor-highlight-colorpicker-label">Highlight
                                                    color</span>
                                            </div>
                                            <div id="editorHighlightThickness">
                                                <label for="editorFreeHighlightThickness" class="editorParamsLabel"
                                                    data-l10n-id="pdfjs-editor-free-highlight-thickness-input">Thickness</label>
                                                <div class="thicknessPicker">
                                                    <input type="range" id="editorFreeHighlightThickness"
                                                        class="editorParamsSlider"
                                                        data-l10n-id="pdfjs-editor-free-highlight-thickness-title"
                                                        value="12" min="8" max="24" step="1" tabindex="0">
                                                </div>
                                            </div>
                                            <div id="editorHighlightVisibility">
                                                <div class="divider"></div>
                                                <div class="toggler">
                                                    <label for="editorHighlightShowAll" class="editorParamsLabel"
                                                        data-l10n-id="pdfjs-editor-highlight-show-all-button-label">Show
                                                        all</label>
                                                    <button id="editorHighlightShowAll" class="toggle-button"
                                                        type="button"
                                                        data-l10n-id="pdfjs-editor-highlight-show-all-button"
                                                        aria-pressed="true" tabindex="0"></button>
                                                </div>
                                            </div>
                                        </div>
                                    </div>
                                </div>
                                <div id="editorFreeText" class="toolbarButtonWithContainer">
                                    <button id="editorFreeTextButton" class="toolbarButton" type="button"
                                        disabled="disabled" title="Text" role="radio" aria-expanded="false"
                                        aria-haspopup="true" aria-controls="editorFreeTextParamsToolbar"
                                        tabindex="0" data-l10n-id="pdfjs-editor-free-text-button">
                                        <span data-l10n-id="pdfjs-editor-free-text-button-label">Text</span>
                                    </button>
                                    <div class="editorParamsToolbar hidden doorHangerRight"
                                        id="editorFreeTextParamsToolbar">
                                        <div class="editorParamsToolbarContainer">
                                            <div class="editorParamsSetter">
                                                <label for="editorFreeTextColor" class="editorParamsLabel"
                                                    data-l10n-id="pdfjs-editor-free-text-color-input">Color</label>
                                                <input type="color" id="editorFreeTextColor"
                                                    class="editorParamsColor" tabindex="0">
                                            </div>
                                            <div class="editorParamsSetter">
                                                <label for="editorFreeTextFontSize" class="editorParamsLabel"
                                                    data-l10n-id="pdfjs-editor-free-text-size-input">Size</label>
                                                <input type="range" id="editorFreeTextFontSize"
                                                    class="editorParamsSlider" value="10" min="5" max="100" step="1"
                                                    tabindex="0">
                                            </div>
                                        </div>
                                    </div>
                                </div>
                                <div id="editorInk" class="toolbarButtonWithContainer">
                                    <button id="editorInkButton" class="toolbarButton" type="button"
                                        disabled="disabled" title="Draw" role="radio" aria-expanded="false"
                                        aria-haspopup="true" aria-controls="editorInkParamsToolbar" tabindex="0"
                                        data-l10n-id="pdfjs-editor-ink-button">
                                        <span data-l10n-id="pdfjs-editor-ink-button-label">Draw</span>
                                    </button>
                                    <div class="editorParamsToolbar hidden doorHangerRight"
                                        id="editorInkParamsToolbar">
                                        <div class="editorParamsToolbarContainer">
                                            <div class="editorParamsSetter">
                                                <label for="editorInkColor" class="editorParamsLabel"
                                                    data-l10n-id="pdfjs-editor-ink-color-input">Color</label>
                                                <input type="color" id="editorInkColor" class="editorParamsColor"
                                                    tabindex="0">
                                            </div>
                                            <div class="editorParamsSetter">
                                                <label for="editorInkThickness" class="editorParamsLabel"
                                                    data-l10n-id="pdfjs-editor-ink-thickness-input">Thickness</label>
                                                <input type="range" id="editorInkThickness"
                                                    class="editorParamsSlider" value="1" min="1" max="20" step="1"
                                                    tabindex="0">
                                            </div>
                                            <div class="editorParamsSetter">
                                                <label for="editorInkOpacity" class="editorParamsLabel"
                                                    data-l10n-id="pdfjs-editor-ink-opacity-input">Opacity</label>
                                                <input type="range" id="editorInkOpacity" class="editorParamsSlider"
                                                    value="100" min="1" max="100" step="1" tabindex="0">
                                            </div>
                                        </div>
                                    </div>
                                </div>
                                <div id="editorStamp" class="toolbarButtonWithContainer">
                                    <button id="editorStampButton" class="toolbarButton" type="button"
                                        disabled="disabled" title="Add or edit images" role="radio"
                                        aria-expanded="false" aria-haspopup="true"
                                        aria-controls="editorStampParamsToolbar" tabindex="0"
                                        data-l10n-id="pdfjs-editor-stamp-button">
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                                                <span data-l10n-id="pdfjs-scroll-wrapped-button-label">Wrapped
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                                        <div class="horizontalToolbarSeparator"></div>
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                                                <span data-l10n-id="pdfjs-spread-none-button-label">No
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                                                <span data-l10n-id="pdfjs-spread-odd-button-label">Odd
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                                                <span data-l10n-id="pdfjs-spread-even-button-label">Even
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                                        <div id="imageAltTextSettingsSeparator"
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                                        <button id="imageAltTextSettings" type="button"
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                                            <span data-l10n-id="pdfjs-image-alt-text-settings-button-label">Image
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                                        <button id="documentProperties" class="toolbarButton labeled" type="button"
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                                            <span data-l10n-id="pdfjs-document-properties-button-label">Document
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                        <div id="loadingBar">
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                            <span class="reader-tool-label">收起</span>
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                        <button id="openDirectoryButton" class="reader-tool" type="button" title="打开目录" aria-label="打开目录">
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                                <svg viewBox="0 0 24 24" aria-hidden="true"><path d="M6 5h12"/><path d="M12 5v14"/></svg>
                                <span class="reader-tool-label">选读</span>
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                        <button id="toggle-browser-fullscreen" class="reader-tool" type="button" title="浏览器全屏" aria-label="浏览器全屏">
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                                <div class="reader-settings-options" data-setting-group="size">
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                                    <button class="reader-settings-option" type="button" data-size="small">小</button>
                                    <button class="reader-settings-option" type="button" data-size="medium">中</button>
                                    <button class="reader-settings-option" type="button" data-size="large">大</button>
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                                    <button class="reader-highlight-color" type="button" data-highlight-color="green" data-color-label="浅绿" style="--swatch-color: rgba(147, 211, 163, 0.28);" title="浅绿" aria-label="浅绿"></button>
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            <div id="dialogContainer">
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                    <div class="buttonRow">
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                        <p id="creationDateField" aria-labelledby="creationDateLabel">-</p>
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                        <p id="modificationDateField" aria-labelledby="modificationDateLabel">-</p>
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                        <span id="creatorLabel" data-l10n-id="pdfjs-document-properties-creator">Creator:</span>
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                        <span id="versionLabel" data-l10n-id="pdfjs-document-properties-version">PDF Version:</span>
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                        <span id="linearizedLabel" data-l10n-id="pdfjs-document-properties-linearized">Fast Web
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                        <p id="linearizedField" aria-labelledby="linearizedLabel">-</p>
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                                Alt text (alternative text) helps when people can’t see the image or when it doesn’t
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                                    <label for="descriptionButton"
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                                        Aim for 1-2 sentences that describe the subject, setting, or actions.
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                                    <label for="decorativeButton"
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                                        This is used for ornamental images, like borders or watermarks.
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                        <div id="buttons">
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                        <div class="title">
                            <span id="newAltTextTitle" data-l10n-id="pdfjs-editor-new-alt-text-dialog-edit-label"
                                role="sectionhead" tabindex="0">Edit alt text (image description)</span>
                        </div>
                        <div id="mainContent">
                            <div id="descriptionAndSettings">
                                <div id="descriptionInstruction">
                                    <div id="newAltTextDescriptionContainer">
                                        <div class="altTextSpinner" role="status" aria-live="polite"></div>
                                        <textarea id="newAltTextDescriptionTextarea"
                                            placeholder="Write your description here…"
                                            aria-labelledby="descriptionAreaLabel"
                                            data-l10n-id="pdfjs-editor-new-alt-text-textarea" tabindex="0"></textarea>
                                    </div>
                                    <span id="newAltTextDescription" role="note"
                                        data-l10n-id="pdfjs-editor-new-alt-text-description">Short
                                        description for people who can’t see the image or when the image doesn’t
                                        load.</span>
                                    <div id="newAltTextDisclaimer" role="note">
                                        <div><span data-l10n-id="pdfjs-editor-new-alt-text-disclaimer1">This alt text
                                                was created
                                                automatically and may be inaccurate.</span> <a
                                                href="https://support.mozilla.org/en-US/kb/pdf-alt-text" target="_blank"
                                                rel="noopener noreferrer" id="newAltTextLearnMore"
                                                data-l10n-id="pdfjs-editor-new-alt-text-disclaimer-learn-more-url"
                                                tabindex="0">Learn more</a></div>
                                    </div>
                                </div>
                                <div id="newAltTextCreateAutomatically" class="toggler">
                                    <button id="newAltTextCreateAutomaticallyButton" class="toggle-button" type="button"
                                        aria-pressed="true" tabindex="0"></button>
                                    <label for="newAltTextCreateAutomaticallyButton" class="togglerLabel"
                                        data-l10n-id="pdfjs-editor-new-alt-text-create-automatically-button-label">Create
                                        alt text
                                        automatically</label>
                                </div>
                                <div id="newAltTextDownloadModel" class="hidden">
                                    <span id="newAltTextDownloadModelDescription"
                                        data-l10n-id="pdfjs-editor-new-alt-text-ai-model-downloading-progress"
                                        aria-valuemin="0"
                                        data-l10n-args='{ "totalSize": 0, "downloadedSize": 0 }'>Downloading alt text AI
                                        model (0 of 0
                                        MB)</span>
                                </div>
                            </div>
                            <div id="newAltTextImagePreview"></div>
                        </div>
                        <div id="newAltTextError" class="messageBar">
                            <div>
                                <div>
                                    <span class="title" data-l10n-id="pdfjs-editor-new-alt-text-error-title">Couldn’t
                                        create alt text
                                        automatically</span>
                                    <span class="description"
                                        data-l10n-id="pdfjs-editor-new-alt-text-error-description">Please write your
                                        own alt text or try again later.</span>
                                </div>
                                <button id="newAltTextCloseButton" class="closeButton" type="button" tabindex="0"
                                    title="Close"><span
                                        data-l10n-id="pdfjs-editor-new-alt-text-error-close-button">Close</span></button>
                            </div>
                        </div>
                        <div id="newAltTextButtons" class="dialogButtonsGroup">
                            <button id="newAltTextCancel" type="button" class="secondaryButton hidden"
                                tabindex="0"><span
                                    data-l10n-id="pdfjs-editor-alt-text-cancel-button">Cancel</span></button>
                            <button id="newAltTextNotNow" type="button" class="secondaryButton" tabindex="0"><span
                                    data-l10n-id="pdfjs-editor-new-alt-text-not-now-button">Not now</span></button>
                            <button id="newAltTextSave" type="button" class="primaryButton" tabindex="0"><span
                                    data-l10n-id="pdfjs-editor-alt-text-save-button">Save</span></button>
                        </div>
                    </div>
                </dialog>
                <dialog class="dialog" id="altTextSettingsDialog" aria-labelledby="altTextSettingsTitle">
                    <div id="altTextSettingsContainer" class="mainContainer">
                        <div class="title">
                            <span id="altTextSettingsTitle" data-l10n-id="pdfjs-editor-alt-text-settings-dialog-label"
                                role="sectionhead" tabindex="0" class="title">Image alt text settings</span>
                        </div>
                        <div id="automaticAltText">
                            <span data-l10n-id="pdfjs-editor-alt-text-settings-automatic-title">Automatic alt
                                text</span>
                            <div id="automaticSettings">
                                <div id="createModelSetting">
                                    <div class="toggler">
                                        <button id="createModelButton" type="button" class="toggle-button"
                                            aria-pressed="true" tabindex="0"></button>
                                        <label for="createModelButton" class="togglerLabel"
                                            data-l10n-id="pdfjs-editor-alt-text-settings-create-model-button-label">Create
                                            alt text
                                            automatically</label>
                                    </div>
                                    <div id="createModelDescription" class="description">
                                        <span
                                            data-l10n-id="pdfjs-editor-alt-text-settings-create-model-description">Suggests
                                            descriptions to
                                            help people who can’t see the image or when the image doesn’t load.</span>
                                        <a href="https://support.mozilla.org/en-US/kb/pdf-alt-text" target="_blank"
                                            rel="noopener noreferrer" id="altTextSettingsLearnMore"
                                            data-l10n-id="pdfjs-editor-new-alt-text-disclaimer-learn-more-url"
                                            tabindex="0">Learn more</a>
                                    </div>
                                </div>
                                <div id="aiModelSettings">
                                    <div>
                                        <span data-l10n-id="pdfjs-editor-alt-text-settings-download-model-label"
                                            data-l10n-args='{ "totalSize": 180 }'>Alt text AI model (180MB)</span>
                                        <div id="aiModelDescription" class="description">
                                            <span
                                                data-l10n-id="pdfjs-editor-alt-text-settings-ai-model-description">Runs
                                                locally on your device
                                                so your data stays private. Required for automatic alt text.</span>
                                        </div>
                                    </div>
                                    <button id="deleteModelButton" type="button" class="secondaryButton"
                                        tabindex="0"><span
                                            data-l10n-id="pdfjs-editor-alt-text-settings-delete-model-button">Delete</span></button>
                                    <button id="downloadModelButton" type="button" class="secondaryButton"
                                        tabindex="0"><span
                                            data-l10n-id="pdfjs-editor-alt-text-settings-download-model-button">Download</span></button>
                                </div>
                            </div>
                        </div>
                        <div class="dialogSeparator"></div>
                        <div id="altTextEditor">
                            <span data-l10n-id="pdfjs-editor-alt-text-settings-editor-title">Alt text editor</span>
                            <div id="showAltTextEditor">
                                <div class="toggler">
                                    <button id="showAltTextDialogButton" type="button" class="toggle-button"
                                        aria-pressed="true" tabindex="0"></button>
                                    <label for="showAltTextDialogButton" class="togglerLabel"
                                        data-l10n-id="pdfjs-editor-alt-text-settings-show-dialog-button-label">Show alt
                                        text editor right away
                                        when adding an image</label>
                                </div>
                                <div id="showAltTextDialogDescription" class="description">
                                    <span data-l10n-id="pdfjs-editor-alt-text-settings-show-dialog-description">Helps
                                        you make sure all your
                                        images have alt text.</span>
                                </div>
                            </div>
                        </div>
                        <div id="buttons" class="dialogButtonsGroup">
                            <button id="altTextSettingsCloseButton" type="button" class="primaryButton"
                                tabindex="0"><span
                                    data-l10n-id="pdfjs-editor-alt-text-settings-close-button">Close</span></button>
                        </div>
                    </div>
                </dialog>
                <dialog id="printServiceDialog" style="min-width: 200px;">
                    <div class="row">
                        <span data-l10n-id="pdfjs-print-progress-message">Preparing document for printing…</span>
                    </div>
                    <div class="row">
                        <progress value="0" max="100"></progress>
                        <span data-l10n-id="pdfjs-print-progress-percent" data-l10n-args='{ "progress": 0 }'
                            class="relative-progress">0%</span>
                    </div>
                    <div class="buttonRow">
                        <button id="printCancel" class="dialogButton" type="button"><span
                                data-l10n-id="pdfjs-print-progress-close-button">Cancel</span></button>
                    </div>
                </dialog>
            </div>

            <div id="printContainer"></div>

            <script>
                const uploadButton = document.getElementById('uploadButton');
                const pdfInput = document.getElementById('pdfInput');
                const filenameModal = document.getElementById('filenameModal');
                const modalOverlay = document.getElementById('modalOverlay');
                const confirmUploadButton = document.getElementById('confirmUpload');
                const cancelUploadButton = document.getElementById('cancelUpload');
                const customFileNameInput = document.getElementById('customFileName');
                const openDirectoryButton = document.getElementById('openDirectoryButton');
                const directoryModal = document.getElementById('directoryModal');
                const closeDirectoryButton = document.getElementById('closeDirectoryButton');
                const pdfList = document.getElementById('pdfList');
                const prevPageButton = document.getElementById('prevPage');
                const nextPageButton = document.getElementById('nextPage');
                const pageInfo = document.getElementById('pageInfo');
                const readPageButton = document.getElementById('select-all-text');
                const pausePlayButton = document.getElementById('pause-play-button');
                const stopPlayButton = document.getElementById('stop-play-button');
                const nightModeButton = document.getElementById('nightModeButton');
                const userMenu = document.getElementById('userMenu');
                const userMenuTrigger = document.getElementById('userMenuTrigger');
                const userMenuPanel = document.getElementById('userMenuPanel');
                const userLogoutBtn = document.getElementById('userLogoutBtn');
                const userAdminBtn = document.getElementById('userAdminBtn');
                const readerControls = document.getElementById('readerControls');
                const readerControlsCollapse = document.getElementById('readerControlsCollapse');
                const readerSettingsButton = document.getElementById('readerSettingsButton');
                const readerSettingsPanel = document.getElementById('readerSettingsPanel');
                const ttsHighlightToggle = document.getElementById('ttsHighlightToggle');
                const sidebarToggleButton = document.getElementById('sidebarToggleButton');
                const browserFullscreenButton = document.getElementById('toggle-browser-fullscreen');

                let selectedFile = null;
                let currentPage = 1;
                const itemsPerPage = 10;
                let allFiles = [];
                let selectedStartContext = null;
                let sidebarWasOpenBeforeReaderCollapse = false;
                const currentFilePath = new URLSearchParams(window.location.search).get('file') || '';
                let isRestoringProgress = false;
                const NIGHT_MODE_STORAGE_KEY = 'reader_pro.night_mode';
                const READER_SIZE_STORAGE_KEY = 'reader_pro.controls.size';
                const READER_COLLAPSED_STORAGE_KEY = 'reader_pro.controls.collapsed';
                const TTS_HIGHLIGHT_ENABLED_STORAGE_KEY = 'reader_pro.tts_highlight.enabled';
                const TTS_HIGHLIGHT_COLOR_STORAGE_KEY = 'reader_pro.tts_highlight.color';
                const TTS_HIGHLIGHT_COLORS = {
                    blue: 'rgba(125, 190, 255, 0.16)',
                    green: 'rgba(147, 211, 163, 0.16)',
                    yellow: 'rgba(248, 223, 125, 0.18)',
                    purple: 'rgba(196, 167, 255, 0.17)'
                };

                function updateReaderToggleIcon() {
                    const icon = readerControlsCollapse.querySelector('svg path');
                    const position = document.body.dataset.readerPosition || 'left';
                    const collapsed = readerControls.classList.contains('collapsed');
                    const directionMap = {
                        left: collapsed ? 'M9 6l6 6-6 6' : 'M15 6l-6 6 6 6',
                        right: collapsed ? 'M15 6l-6 6 6 6' : 'M9 6l6 6-6 6',
                        top: collapsed ? 'M6 15l6-6 6 6' : 'M6 9l6 6 6-6',
                        bottom: collapsed ? 'M6 9l6 6 6-6' : 'M6 15l6-6 6 6'
                    };
                    icon.setAttribute('d', directionMap[position] || directionMap.left);
                }

                function setReaderControlsCollapsed(collapsed) {
                    readerControls.classList.toggle('collapsed', collapsed);
                    readerControlsCollapse.setAttribute('aria-expanded', String(!collapsed));
                    document.body.classList.toggle('reader-controls-collapsed', collapsed);

                    if (collapsed) {
                        sidebarWasOpenBeforeReaderCollapse = sidebarToggleButton.getAttribute('aria-expanded') === 'true';
                        if (sidebarWasOpenBeforeReaderCollapse) {
                            sidebarToggleButton.click();
                        }
                    } else if (sidebarWasOpenBeforeReaderCollapse &&
                        sidebarToggleButton.getAttribute('aria-expanded') !== 'true') {
                        sidebarToggleButton.click();
                    }

                    localStorage.setItem(READER_COLLAPSED_STORAGE_KEY, collapsed ? '1' : '0');
                    updateReaderToggleIcon();
                }

                function setReaderControlsPosition(position) {
                    const normalized = ['left', 'right'].includes(position) ? position : 'left';
                    document.body.classList.remove('reader-position-left', 'reader-position-right', 'reader-position-top', 'reader-position-bottom');
                    document.body.classList.add(`reader-position-${normalized}`);
                    document.body.dataset.readerPosition = normalized;
                    updateReaderToggleIcon();
                }

                function setReaderControlsSize(size) {
                    const normalized = ['xsmall', 'small', 'medium', 'large'].includes(size) ? size : 'small';
                    document.body.classList.remove('reader-size-xsmall', 'reader-size-small', 'reader-size-medium', 'reader-size-large');
                    document.body.classList.add(`reader-size-${normalized}`);
                    document.body.dataset.readerSize = normalized;
                    localStorage.setItem(READER_SIZE_STORAGE_KEY, normalized);
                    document.querySelectorAll('[data-size]').forEach(button => {
                        button.classList.toggle('is-selected', button.dataset.size === normalized);
                    });
                }

                function isTtsHighlightEnabled() {
                    return localStorage.getItem(TTS_HIGHLIGHT_ENABLED_STORAGE_KEY) !== '0';
                }

                function getTtsHighlightColorKey() {
                    const colorKey = localStorage.getItem(TTS_HIGHLIGHT_COLOR_STORAGE_KEY) || 'blue';
                    return Object.prototype.hasOwnProperty.call(TTS_HIGHLIGHT_COLORS, colorKey) ? colorKey : 'blue';
                }

                function applyTtsHighlightSettingsToUi() {
                    const enabled = isTtsHighlightEnabled();
                    const colorKey = getTtsHighlightColorKey();
                    ttsHighlightToggle.classList.toggle('is-selected', enabled);
                    ttsHighlightToggle.textContent = enabled ? '开启' : '关闭';
                    ttsHighlightToggle.setAttribute('aria-pressed', enabled ? 'true' : 'false');
                    document.querySelectorAll('[data-highlight-color]').forEach(button => {
                        button.classList.toggle('is-selected', button.dataset.highlightColor === colorKey);
                    });
                }

                function refreshActiveHighlightIfNeeded() {
                    clearActiveTtsHighlight();
                    if (!isTtsHighlightEnabled()) return;
                    if (!playbackHighlightContext?.activeSentenceText && playbackHighlightContext?.activeSentenceIndex === null) return;
                    restoreActiveSentenceHighlight();
                }

                function setTtsHighlightEnabled(enabled) {
                    localStorage.setItem(TTS_HIGHLIGHT_ENABLED_STORAGE_KEY, enabled ? '1' : '0');
                    applyTtsHighlightSettingsToUi();
                    refreshActiveHighlightIfNeeded();
                }

                function setTtsHighlightColor(colorKey) {
                    const normalized = Object.prototype.hasOwnProperty.call(TTS_HIGHLIGHT_COLORS, colorKey) ? colorKey : 'blue';
                    localStorage.setItem(TTS_HIGHLIGHT_COLOR_STORAGE_KEY, normalized);
                    applyTtsHighlightSettingsToUi();
                    refreshActiveHighlightIfNeeded();
                }

                function initReaderControls() {
                    setReaderControlsPosition('left');
                    setReaderControlsSize(localStorage.getItem(READER_SIZE_STORAGE_KEY) || 'small');
                    setReaderControlsCollapsed(localStorage.getItem(READER_COLLAPSED_STORAGE_KEY) === '1');
                    applyTtsHighlightSettingsToUi();
                }

                function updateNightModeButton(isEnabled) {
                    const icon = nightModeButton.querySelector('svg');
                    nightModeButton.classList.toggle('is-active', isEnabled);
                    nightModeButton.title = isEnabled ? '日间模式' : '夜间模式';
                    nightModeButton.setAttribute('aria-label', isEnabled ? '日间模式' : '夜间模式');
                    icon.innerHTML = isEnabled
                        ? '<circle cx="12" cy="12" r="4" fill="none"></circle><path d="M12 2.5v2.5"/><path d="M12 19v2.5"/><path d="M4.9 4.9l1.8 1.8"/><path d="M17.3 17.3l1.8 1.8"/><path d="M2.5 12H5"/><path d="M19 12h2.5"/><path d="M4.9 19.1l1.8-1.8"/><path d="M17.3 6.7l1.8-1.8"/>'
                        : '<path d="M21 12.8A9 9 0 1 1 11.2 3a7 7 0 0 0 9.8 9.8z"></path>';
                }

                function setNightMode(enabled) {
                    document.body.classList.toggle('night-reading-mode', enabled);
                    updateNightModeButton(enabled);
                    localStorage.setItem(NIGHT_MODE_STORAGE_KEY, enabled ? '1' : '0');
                    syncPdfJsNightPreferences(enabled);
                    applyPdfNightMode(enabled);
                }

                function syncPdfJsNightPreferences(enabled) {
                    const pdfjsPreferencesKey = 'pdfjs.preferences';
                    let preferences = {};

                    try {
                        preferences = JSON.parse(localStorage.getItem(pdfjsPreferencesKey)) || {};
                    } catch (e) {
                        preferences = {};
                    }

                    preferences.forcePageColors = enabled;
                    preferences.pageColorsBackground = '#0b0b0b';
                    preferences.pageColorsForeground = '#f5f5f5';
                    localStorage.setItem(pdfjsPreferencesKey, JSON.stringify(preferences));
                }

                function initNightMode() {
                    const enabled = localStorage.getItem(NIGHT_MODE_STORAGE_KEY) === '1';
                    setNightMode(enabled);
                }

                function applyPdfNightMode(enabled) {
                    const app = window.PDFViewerApplication;
                    const options = window.PDFViewerApplicationOptions;
                    const pdfViewer = app?.pdfViewer;
                    const pdfThumbnailViewer = app?.pdfThumbnailViewer;
                    const renderingQueue = app?.pdfRenderingQueue;

                    if (!options || !pdfViewer?.pdfDocument) {
                        return;
                    }

                    const pageColors = enabled
                        ? { background: '#0b0b0b', foreground: '#f5f5f5' }
                        : null;

                    options.set('forcePageColors', enabled);
                    options.set('pageColorsBackground', '#0b0b0b');
                    options.set('pageColorsForeground', '#f5f5f5');

                    pdfViewer.pageColors = pageColors;
                    if (pdfViewer.viewer) {
                        if (pageColors?.background) {
                            pdfViewer.viewer.style.setProperty('--page-bg-color', pageColors.background);
                        } else {
                            pdfViewer.viewer.style.removeProperty('--page-bg-color');
                        }
                    }

                    for (let i = 0; i < pdfViewer.pagesCount; i++) {
                        const pageView = pdfViewer.getPageView(i);
                        if (!pageView) continue;
                        pageView.pageColors = pageColors;
                        pageView.reset();
                    }

                    if (pdfThumbnailViewer) {
                        pdfThumbnailViewer.pageColors = pageColors;
                        for (let i = 0; i < pdfViewer.pagesCount; i++) {
                            const thumbnail = pdfThumbnailViewer.getThumbnail(i);
                            if (!thumbnail) continue;
                            thumbnail.pageColors = pageColors;
                            thumbnail.reset();
                        }
                    }

                    pdfViewer.update();
                    renderingQueue?.renderHighestPriority();
                    if (playbackHighlightContext?.activeSentenceText || playbackHighlightContext?.activeSentenceIndex !== null) {
                        restoreActiveSentenceHighlight();
                    }
                }

                function getFullscreenElement() {
                    return document.fullscreenElement ||
                        document.webkitFullscreenElement ||
                        document.mozFullScreenElement ||
                        document.msFullscreenElement ||
                        null;
                }

                function updateBrowserFullscreenButton() {
                    const isFullscreen = !!getFullscreenElement();
                    browserFullscreenButton.classList.toggle('is-active', isFullscreen);
                    browserFullscreenButton.title = isFullscreen ? '退出浏览器全屏' : '浏览器全屏';
                    browserFullscreenButton.setAttribute('aria-label', isFullscreen ? '退出浏览器全屏' : '浏览器全屏');
                }

                async function toggleBrowserFullscreen() {
                    const target = document.documentElement;
                    const isFullscreen = !!getFullscreenElement();

                    try {
                        if (isFullscreen) {
                            if (document.exitFullscreen) {
                                await document.exitFullscreen();
                            } else if (document.webkitExitFullscreen) {
                                document.webkitExitFullscreen();
                            } else if (document.mozCancelFullScreen) {
                                document.mozCancelFullScreen();
                            } else if (document.msExitFullscreen) {
                                document.msExitFullscreen();
                            }
                            return;
                        }

                        if (target.requestFullscreen) {
                            await target.requestFullscreen({ navigationUI: 'hide' });
                        } else if (target.webkitRequestFullscreen) {
                            target.webkitRequestFullscreen();
                        } else if (target.mozRequestFullScreen) {
                            target.mozRequestFullScreen();
                        } else if (target.msRequestFullscreen) {
                            target.msRequestFullscreen();
                        } else {
                            alert('当前浏览器不支持网页全屏');
                        }
                    } catch (error) {
                        console.warn('切换浏览器全屏失败:', error);
                    } finally {
                        setTimeout(updateBrowserFullscreenButton, 0);
                    }
                }

                async function ensureLoggedIn() {
                    try {
                        const resp = await fetch('/auth/me');
                        if (!resp.ok) {
                            window.location.href = '/login';
                            return false;
                        }
                        const data = await resp.json();
                        if (!data || !data.success) {
                            window.location.href = '/login';
                            return false;
                        }
                        userMenuTrigger.textContent = data.username || '用户';
                        userAdminBtn.style.display = data.is_admin ? 'block' : 'none';
                        return true;
                    } catch (e) {
                        window.location.href = '/login';
                        return false;
                    }
                }

                userMenuTrigger.addEventListener('click', function (event) {
                    event.stopPropagation();
                    userMenu.classList.toggle('open');
                });
                document.addEventListener('click', function (event) {
                    if (!userMenu.contains(event.target)) {
                        userMenu.classList.remove('open');
                    }
                });
                userLogoutBtn.addEventListener('click', async function () {
                    try {
                        await fetch('/auth/logout', { method: 'POST' });
                    } finally {
                        window.location.href = '/login';
                    }
                });
                userAdminBtn.addEventListener('click', function () {
                    window.location.href = '/admin';
                });
                initNightMode();
                initReaderControls();
                updateBrowserFullscreenButton();
                nightModeButton.addEventListener('click', function () {
                    const nextEnabled = !document.body.classList.contains('night-reading-mode');
                    setNightMode(nextEnabled);
                });
                browserFullscreenButton.addEventListener('click', () => {
                    toggleBrowserFullscreen();
                });
                readerControlsCollapse.addEventListener('click', () => {
                    setReaderControlsCollapsed(!readerControls.classList.contains('collapsed'));
                });
                readerSettingsButton.addEventListener('click', event => {
                    event.stopPropagation();
                    const nextOpen = !readerControls.classList.contains('settings-open');
                    readerControls.classList.toggle('settings-open', nextOpen);
                    readerSettingsButton.setAttribute('aria-expanded', String(nextOpen));
                });
                document.addEventListener('click', event => {
                    if (!readerControls.contains(event.target)) {
                        readerControls.classList.remove('settings-open');
                        readerSettingsButton.setAttribute('aria-expanded', 'false');
                    }
                });
                readerSettingsPanel.querySelectorAll('[data-size]').forEach(button => {
                    button.addEventListener('click', () => setReaderControlsSize(button.dataset.size));
                });
                ttsHighlightToggle.addEventListener('click', () => {
                    setTtsHighlightEnabled(!isTtsHighlightEnabled());
                });
                readerSettingsPanel.querySelectorAll('[data-highlight-color]').forEach(button => {
                    button.addEventListener('click', () => {
                        setTtsHighlightColor(button.dataset.highlightColor);
                    });
                });
                document.addEventListener('fullscreenchange', updateBrowserFullscreenButton);
                document.addEventListener('webkitfullscreenchange', updateBrowserFullscreenButton);
                document.addEventListener('mozfullscreenchange', updateBrowserFullscreenButton);
                document.addEventListener('MSFullscreenChange', updateBrowserFullscreenButton);

                async function saveReadingProgress(pageNumber) {
                    if (!currentFilePath || !Number.isInteger(pageNumber) || pageNumber < 1) return;
                    try {
                        await fetch('/reading-progress', {
                            method: 'POST',
                            headers: { 'Content-Type': 'application/json' },
                            body: JSON.stringify({ file: currentFilePath, page: pageNumber })
                        });
                    } catch (error) {
                        console.warn('保存阅读进度失败:', error);
                    }
                }

                async function restoreReadingProgress() {
                    if (!currentFilePath || isRestoringProgress) return;
                    isRestoringProgress = true;
                    try {
                        const response = await fetch(`/reading-progress?file=${encodeURIComponent(currentFilePath)}`);
                        if (!response.ok) return;
                        const data = await response.json();
                        const page = Number(data?.page);
                        const app = window.PDFViewerApplication;
                        const totalPages = app?.pdfDocument?.numPages;
                        if (app && Number.isInteger(page) && page >= 1 && totalPages && page <= totalPages) {
                            app.pdfViewer.currentPageNumber = page;
                        }
                    } catch (error) {
                        console.warn('恢复阅读进度失败:', error);
                    } finally {
                        isRestoringProgress = false;
                    }
                }

                function setupReadingProgressSync() {
                    const bindEvents = () => {
                        const app = window.PDFViewerApplication;
                        const eventBus = app ? app.eventBus : null;
                        if (!eventBus) {
                            setTimeout(bindEvents, 200);
                            return;
                        }

                        let hasRestored = false;
                        const tryRestore = () => {
                            if (hasRestored) return;
                            const docReady = app?.pdfDocument && app?.pdfViewer;
                            if (!docReady) return;
                            hasRestored = true;
                            restoreReadingProgress();
                        };

                        eventBus.on('pagesloaded', tryRestore);
                        eventBus.on('documentloaded', tryRestore);
                        eventBus.on('pagechanging', evt => {
                            const page = Number(evt?.pageNumber);
                            if (Number.isInteger(page) && page > 0) {
                                saveReadingProgress(page);
                            }
                        });
                    };
                    bindEvents();
                }
                setupReadingProgressSync();
                ensureLoggedIn();

                // 上传按钮点击事件
                uploadButton.addEventListener('click', function () {
                    pdfInput.click();
                });

                // 文件选择事件
                pdfInput.addEventListener('change', function (event) {
                    const file = event.target.files[0];
                    if (file && file.type === 'application/pdf') {
                        selectedFile = file;
                        modalOverlay.style.display = 'block';
                        filenameModal.style.display = 'block';
                        customFileNameInput.value = "";
                        customFileNameInput.focus();
                    } else {
                        alert('请选择一个 PDF 文件');
                    }
                });

                // 取消上传
                cancelUploadButton.addEventListener('click', function () {
                    filenameModal.style.display = 'none';
                    modalOverlay.style.display = 'none';
                    pdfInput.value = "";
                    selectedFile = null;
                });

                // 确认上传
                confirmUploadButton.addEventListener('click', function () {
                    const customFileName = customFileNameInput.value.trim();
                    if (customFileName === "") {
                        alert('请输入保存的文件名');
                        customFileNameInput.focus();
                        return;
                    }

                    const invalidChars = /[\\/:"*?<>|]+/;
                    if (invalidChars.test(customFileName)) {
                        alert('文件名包含非法字符：\\ / : " * ? < > |');
                        customFileNameInput.focus();
                        return;
                    }

                    if (!selectedFile) {
                        alert('没有选择文件');
                        return;
                    }

                    const formData = new FormData();
                    formData.append('file', selectedFile);
                    formData.append('custom_name', customFileName);

                    fetch('/upload-pdf', {
                        method: 'POST',
                        body: formData
                    })
                        .then(response => {
                            if (!response.ok) {
                                throw new Error(`HTTP ${response.status}`);
                            }
                            return response.json();
                        })
                        .then(data => {
                            if (data.success) {
                                const uploadedFilePath = data.file_path;
                                const redirectUrl = `viewer.html?file=${encodeURIComponent(uploadedFilePath)}`;
                                window.location.href = redirectUrl;
                            } else {
                                alert('上传失败: ' + data.error);
                            }
                        })
                        .catch(error => {
                            console.error('Error:', error);
                            alert('上传过程中发生错误');
                        })
                        .finally(() => {
                            filenameModal.style.display = 'none';
                            modalOverlay.style.display = 'none';
                            pdfInput.value = "";
                            selectedFile = null;
                        });
                });

                // 显示目录分页
                function displayDirectoryPage(page) {
                    pdfList.innerHTML = '';
                    const start = (page - 1) * itemsPerPage;
                    const end = start + itemsPerPage;
                    const pageFiles = allFiles.slice(start, end);

                    if (pageFiles.length === 0) {
                        const listItem = document.createElement('li');
                        listItem.textContent = '没有已上传的 PDF 文档。';
                        pdfList.appendChild(listItem);
                    } else {
                        pageFiles.forEach(file => {
                            const listItem = document.createElement('li');
                            const link = document.createElement('a');
                            link.href = `viewer.html?file=${file.url}`;
                            link.textContent = file.name;
                            link.addEventListener('click', function (event) {
                                event.preventDefault();
                                window.location.href = link.getAttribute('href');
                            });
                            listItem.appendChild(link);
                            pdfList.appendChild(listItem);
                        });
                    }

                    pageInfo.textContent = `第 ${page} 页 / 共 ${Math.ceil(allFiles.length / itemsPerPage)} 页`;
                    prevPageButton.disabled = page === 1;
                    nextPageButton.disabled = end >= allFiles.length;
                }

                // 打开目录
                openDirectoryButton.addEventListener('click', function () {
                    modalOverlay.style.display = 'block';
                    directoryModal.style.display = 'block';
                    currentPage = 1;

                    fetch('/list-pdfs')
                        .then(response => {
                            if (!response.ok) {
                                throw new Error(`HTTP ${response.status}`);
                            }
                            return response.json();
                        })
                        .then(data => {
                            if (data.success) {
                                allFiles = data.files;
                                displayDirectoryPage(currentPage);
                            } else {
                                alert('无法获取文件列表: ' + data.error);
                            }
                        })
                        .catch(error => {
                            console.error('Error:', error);
                            alert('获取文件列表时发生错误');
                        });
                });

                // 上一页
                prevPageButton.addEventListener('click', function () {
                    if (currentPage > 1) {
                        currentPage--;
                        displayDirectoryPage(currentPage);
                    }
                });

                // 下一页
                nextPageButton.addEventListener('click', function () {
                    if (currentPage < Math.ceil(allFiles.length / itemsPerPage)) {
                        currentPage++;
                        displayDirectoryPage(currentPage);
                    }
                });

                // 关闭目录
                closeDirectoryButton.addEventListener('click', function () {
                    directoryModal.style.display = 'none';
                    modalOverlay.style.display = 'none';
                });

                // 点击遮罩关闭弹出层
                modalOverlay.addEventListener('click', function () {
                    if (filenameModal.style.display === 'block') {
                        filenameModal.style.display = 'none';
                        uploadButton.focus();
                    }
                    if (directoryModal.style.display === 'block') {
                        directoryModal.style.display = 'none';
                    }
                    modalOverlay.style.display = 'none';
                });

                // 语音控制
                let isListening = false;
                let audioContext = null;
                let isPaused = false;
                let currentAudio = null;
                let activePlayController = null;
                let activeStreamReader = null;
                let playbackHighlightContext = null;
                let activeHighlightNodes = [];
                let activeHighlightFrame = null;

                // 初始化 AudioContext
                function initAudioContext() {
                    if (!audioContext) {
                        audioContext = new (window.AudioContext || window.webkitAudioContext)();
                    }
                }

                // 获取播放权限
                async function getPlayPermission() {
                    return new Promise((resolve) => {
                        const dummyAudio = new Audio('data:audio/wav;base64,UklGRl9vT19XQVZFZm10IBAAAAABAAEAQB8AAEAfAAABAAgAZGF0YU');
                        dummyAudio.play()
                            .then(() => {
                                dummyAudio.pause();
                                dummyAudio.remove();
                                resolve();
                            })
                            .catch((error) => {
                                console.warn('Audio play permission denied:', error);
                                resolve(); // 静默处理权限错误
                            });
                    });
                }

                // 切换文本选择监听
                document.getElementById('toggle-text-select').addEventListener('click', () => {
                    isListening = !isListening;
                    const button = document.getElementById('toggle-text-select');
                    button.classList.toggle('is-active', isListening);
                    button.title = isListening ? '关闭监听' : '文本选择';
                    button.setAttribute('aria-label', isListening ? '关闭监听' : '文本选择');
                });

                // 暂停/继续播放
                pausePlayButton.addEventListener('click', () => {
                    isPaused = !isPaused;
                    pausePlayButton.classList.toggle('is-active', isPaused);
                    pausePlayButton.title = isPaused ? '继续播放' : '暂停播放';
                    pausePlayButton.setAttribute('aria-label', isPaused ? '继续播放' : '暂停播放');
                    if (isPaused && currentAudio) {
                        currentAudio.pause();
                        if (audioContext) audioContext.suspend();
                    } else if (!isPaused && currentAudio) {
                        currentAudio.play();
                        if (audioContext) audioContext.resume();
                    }
                });

                // 停止播放
                function stopCurrentPlayback(showTip = true) {
                    if (activePlayController) {
                        activePlayController.abort();
                        activePlayController = null;
                    }
                    if (activeStreamReader) {
                        try {
                            activeStreamReader.cancel();
                        } catch (e) {
                            console.warn('取消流读取失败:', e);
                        }
                        activeStreamReader = null;
                    }
                    if (currentAudio) {
                        currentAudio.onended = null;
                        currentAudio.onerror = null;
                        currentAudio.pause();
                        currentAudio.src = '';
                        currentAudio.load();
                        currentAudio = null;
                    }
                    if (audioContext && audioContext.state === 'running') {
                        audioContext.suspend().catch(() => {});
                    }
                    isPaused = false;
                    pausePlayButton.classList.remove('is-active');
                    pausePlayButton.title = '暂停播放';
                    pausePlayButton.setAttribute('aria-label', '暂停播放');
                    clearActiveTtsHighlight();
                    playbackHighlightContext = null;
                    if (showTip) {
                        const loadingIndicator = document.getElementById('loading-indicator');
                        loadingIndicator.textContent = '已停止';
                        loadingIndicator.style.display = 'block';
                        setTimeout(() => {
                            loadingIndicator.style.display = 'none';
                        }, 800);
                    }
                }

                stopPlayButton.addEventListener('click', () => {
                    stopCurrentPlayback();
                });

                function countOccurrences(haystack, needle) {
                    if (!haystack || !needle) return 0;
                    let count = 0;
                    let pos = 0;
                    const source = haystack.toLowerCase();
                    const target = needle.toLowerCase();
                    while (true) {
                        const idx = source.indexOf(target, pos);
                        if (idx === -1) break;
                        count++;
                        pos = idx + target.length;
                    }
                    return count;
                }

                function findNthOccurrence(haystack, needle, n) {
                    if (!haystack || !needle || !n || n < 1) return -1;
                    let pos = 0;
                    let seen = 0;
                    const source = haystack.toLowerCase();
                    const target = needle.toLowerCase();
                    while (true) {
                        const idx = source.indexOf(target, pos);
                        if (idx === -1) return -1;
                        seen++;
                        if (seen === n) return idx;
                        pos = idx + target.length;
                    }
                }

                function normalizeForTtsMatch(text) {
                    return (text || '')
                        .replace(/\s+/g, ' ')
                        .replace(/([A-Za-z0-9])\s*\.\s*([A-Za-z0-9])/g, '$1.$2')
                        .trim();
                }

                function splitTextForHighlight(text) {
                    const normalized = normalizeForTtsMatch(text);
                    if (!normalized) return [];
                    return normalized
                        .split(/(?<=[。！？!?；;…\.])\s+/)
                        .map(item => item.trim())
                        .filter(Boolean);
                }

                function clearActiveTtsHighlight() {
                    if (activeHighlightFrame) {
                        cancelAnimationFrame(activeHighlightFrame);
                        activeHighlightFrame = null;
                    }
                    for (const node of activeHighlightNodes) {
                        node.remove();
                    }
                    activeHighlightNodes = [];
                }

                function getCurrentPageTextLayer() {
                    const { pdfViewer } = PDFViewerApplication || {};
                    const currentPageNumber = pdfViewer?.currentPageNumber;
                    if (!currentPageNumber) return null;
                    return document.querySelector(`.page[data-page-number="${currentPageNumber}"] .textLayer`);
                }

                function buildTextLayerIndex(textLayer) {
                    if (!textLayer) return null;
                    const spans = Array.from(textLayer.querySelectorAll('span')).filter(span => {
                        return !span.classList.contains('endOfContent') && span.textContent && span.textContent.trim();
                    });
                    if (spans.length === 0) return null;

                    const entries = [];
                    let fullText = '';
                    for (const span of spans) {
                        const spanText = span.textContent || '';
                        const normalizedText = normalizeForTtsMatch(spanText);
                        if (!normalizedText) continue;
                        if (fullText && !/\s$/.test(fullText)) {
                            fullText += ' ';
                        }
                        const start = fullText.length;
                        fullText += normalizedText;
                        entries.push({
                            span,
                            rawText: spanText,
                            normalizedText,
                            start,
                            end: fullText.length
                        });
                    }

                    if (!entries.length || !fullText) return null;
                    return { textLayer, text: fullText, entries };
                }

                function buildPlaybackHighlightContext(fullText) {
                    const textLayer = getCurrentPageTextLayer();
                    const textLayerIndex = buildTextLayerIndex(textLayer);
                    if (!textLayerIndex) return null;
                    return {
                        textLayer,
                        textLayerIndex,
                        fullText,
                        sentences: splitTextForHighlight(fullText),
                        searchOffset: 0,
                        lastWindowKey: '',
                        currentRange: null,
                        activeSentenceIndex: null,
                        activeSentenceText: ''
                    };
                }

                function rebuildPlaybackHighlightContext() {
                    const fullText = playbackHighlightContext?.fullText;
                    if (!fullText) return false;
                    const nextContext = buildPlaybackHighlightContext(fullText);
                    if (!nextContext) return false;
                    nextContext.searchOffset = playbackHighlightContext?.searchOffset || 0;
                    nextContext.activeSentenceIndex = playbackHighlightContext?.activeSentenceIndex ?? null;
                    nextContext.activeSentenceText = playbackHighlightContext?.activeSentenceText || '';
                    playbackHighlightContext = nextContext;
                    return true;
                }

                function restoreActiveSentenceHighlight(retryCount = 0) {
                    if (!isTtsHighlightEnabled()) return;
                    const activeSentenceIndex = playbackHighlightContext?.activeSentenceIndex;
                    const activeSentenceText = playbackHighlightContext?.activeSentenceText || '';
                    if (activeSentenceIndex === null && !activeSentenceText) return;

                    clearActiveTtsHighlight();
                    if (rebuildPlaybackHighlightContext()) {
                        highlightSentenceAtIndex(activeSentenceIndex ?? 0, activeSentenceText, true);
                        return;
                    }

                    if (retryCount >= 12) return;
                    setTimeout(() => restoreActiveSentenceHighlight(retryCount + 1), 120);
                }

                function updateHighlightWindow(rangeStart, rangeEnd) {
                    if (!isTtsHighlightEnabled()) return;
                    const ctx = playbackHighlightContext;
                    if (!ctx?.textLayerIndex) return;
                    const layerText = ctx.textLayerIndex.text;
                    const safeStart = Math.max(0, Math.min(rangeStart, layerText.length));
                    const safeEnd = Math.max(safeStart, Math.min(rangeEnd, layerText.length));
                    const windowKey = `${safeStart}:${safeEnd}`;
                    if (ctx.lastWindowKey === windowKey) return;
                    ctx.lastWindowKey = windowKey;

                    for (const node of activeHighlightNodes) {
                        node.remove();
                    }
                    activeHighlightNodes = [];

                    for (const entry of ctx.textLayerIndex.entries) {
                        if (entry.end <= safeStart) continue;
                        if (entry.start >= safeEnd) break;

                        const pageRect = ctx.textLayer.getBoundingClientRect();
                        const spanRect = entry.span.getBoundingClientRect();
                        const overlapStart = Math.max(safeStart, entry.start);
                        const overlapEnd = Math.min(safeEnd, entry.end);
                        if (overlapEnd <= overlapStart) continue;

                        const entryLength = Math.max(1, entry.end - entry.start);
                        const startRatio = (overlapStart - entry.start) / entryLength;
                        const endRatio = (overlapEnd - entry.start) / entryLength;
                        const clippedLeft = spanRect.width * startRatio;
                        const clippedWidth = Math.max(2, spanRect.width * (endRatio - startRatio));
                        const left = spanRect.left - pageRect.left + clippedLeft;
                        const top = spanRect.top - pageRect.top;
                        const width = Math.min(spanRect.width - clippedLeft, clippedWidth);
                        const height = spanRect.height;
                        if (width <= 0 || height <= 0) continue;

                        const overlay = document.createElement('div');
                        overlay.className = 'highlight appended tts-progress-highlight';
                        const highlightColor = TTS_HIGHLIGHT_COLORS[getTtsHighlightColorKey()];
                        overlay.style.setProperty('--highlight-bg-color', highlightColor, 'important');
                        overlay.style.setProperty('--highlight-selected-bg-color', highlightColor, 'important');
                        overlay.style.setProperty('background-color', highlightColor, 'important');
                        overlay.style.left = `${left}px`;
                        overlay.style.top = `${top}px`;
                        overlay.style.width = `${width}px`;
                        overlay.style.height = `${height}px`;
                        overlay.style.position = 'absolute';
                        ctx.textLayer.appendChild(overlay);
                        activeHighlightNodes.push(overlay);
                    }
                }

                function highlightSentenceAtIndex(sentenceIndex, sentenceText = '', preserveState = false) {
                    clearActiveTtsHighlight();
                    const ctx = playbackHighlightContext;
                    if (!ctx?.textLayerIndex) return;

                    const targetSentence = normalizeForTtsMatch(sentenceText || ctx.sentences?.[sentenceIndex] || '');
                    if (!targetSentence) return;

                    const layerText = ctx.textLayerIndex.text;
                    const startSearch = Math.max(0, ctx.searchOffset || 0);
                    let matchStart = layerText.indexOf(targetSentence, startSearch);
                    if (matchStart === -1) {
                        matchStart = layerText.indexOf(targetSentence);
                    }
                    if (matchStart === -1) return;

                    const matchEnd = matchStart + targetSentence.length;
                    if (!preserveState) {
                        ctx.searchOffset = matchEnd;
                    }
                    ctx.currentRange = { start: matchStart, end: matchEnd };
                    ctx.lastWindowKey = '';
                    ctx.activeSentenceIndex = sentenceIndex;
                    ctx.activeSentenceText = targetSentence;
                    if (!isTtsHighlightEnabled()) return;
                    updateHighlightWindow(matchStart, matchEnd);
                }

                // 仅识别 PDF 页面文字层里的选择，并记录是该页第几次出现
                function getSelectedContextOnPage() {
                    const selection = window.getSelection();
                    if (!selection || selection.rangeCount === 0) {
                        return null;
                    }

                    const selectedText = selection.toString().trim();
                    if (!selectedText) {
                        return null;
                    }

                    const range = selection.getRangeAt(0);
                    const container = range.commonAncestorContainer.nodeType === Node.ELEMENT_NODE
                        ? range.commonAncestorContainer
                        : range.commonAncestorContainer.parentElement;
                    if (!container || !container.closest('.textLayer')) {
                        return null;
                    }

                    const textLayer = container.closest('.textLayer');
                    const firstWord = selectedText.split(/\s+/)[0].trim();
                    const word = firstWord.replace(/(^[^A-Za-z0-9\u4e00-\u9fa5]+|[^A-Za-z0-9\u4e00-\u9fa5]+$)/g, '') || firstWord;
                    if (!word) {
                        return null;
                    }

                    const prefixRange = document.createRange();
                    prefixRange.selectNodeContents(textLayer);
                    prefixRange.setEnd(range.startContainer, range.startOffset);
                    const prefixText = prefixRange.toString();

                    // 当前词是“前缀中已出现次数 + 1”
                    const occurrence = countOccurrences(prefixText, word) + 1;
                    return { word, occurrence };
                }

                function updateReadPageButtonText() {
                    selectedStartContext = getSelectedContextOnPage();
                    readPageButton.title = selectedStartContext ? '从此阅读' : '阅读整页';
                    readPageButton.setAttribute('aria-label', selectedStartContext ? '从此阅读' : '阅读整页');
                }
                document.addEventListener('selectionchange', updateReadPageButtonText);
                updateReadPageButtonText();

                // 播放音频队列（添加句子间停顿以模拟段落停顿）
                async function playAudioSequentially(queue, signal) {
                    const audioElements = new Map();
                    const loadingIndicator = document.getElementById('loading-indicator');
                    const PAUSE_BETWEEN_SENTENCES = 10; // ms 停顿时间，句子间短暂停顿，累积形成段落停顿效果
                    try {
                        while (true) {
                            if (signal.aborted) break;

                            const chunk = queue.shift();
                            if (!chunk) {
                                if (queue.includes(null)) break;
                                await new Promise(resolve => setTimeout(resolve, 100));
                                continue;
                            }

                            if (audioContext && audioContext.state !== 'running') {
                                await audioContext.resume();
                            }

                            const audio = new Audio(chunk.audio);
                            audioElements.set(chunk.index, audio);
                            currentAudio = audio;

                            try {
                                if (signal.aborted) break;
                                highlightSentenceAtIndex(chunk.index, chunk.text || chunk.sentence || chunk.chunk || '');
                                loadingIndicator.textContent = `正在播放第 ${chunk.index + 1} 句`;
                                loadingIndicator.style.display = 'block';
                                await playAudio(audio);
                                if (signal.aborted) break;
                                // 添加句子间停顿（非暂停状态下）
                                if (!signal.aborted && !isPaused) {
                                    await new Promise(resolve => setTimeout(resolve, PAUSE_BETWEEN_SENTENCES));
                                }
                            } catch (e) {
                                console.warn(`播放失败: ${e.message}`);
                            } finally {
                                audioElements.delete(chunk.index);
                                if (audio === currentAudio) currentAudio = null;
                            }
                        }
                        loadingIndicator.textContent = '播放完成';
                        setTimeout(() => {
                            loadingIndicator.style.display = 'none';
                        }, 1000);
                    } catch (error) {
                        console.error(error);
                        loadingIndicator.textContent = `错误: ${error.message}`;
                        loadingIndicator.style.display = 'block';
                    } finally {
                        audioElements.forEach(audio => {
                            audio.onended = null;
                            audio.onerror = null;
                            audio.pause();
                            audio.src = ''; // 清理
                            audio.load();
                        });
                        if (currentAudio) {
                            currentAudio.onended = null;
                            currentAudio.onerror = null;
                            currentAudio.pause();
                            currentAudio.src = '';
                            currentAudio.load();
                            currentAudio = null;
                        }
                        clearActiveTtsHighlight();
                    }
                }

                // 播放单个音频
                function playAudio(audio) {
                    return new Promise((resolve, reject) => {
                        audio.play()
                            .then(() => {
                                audio.onended = () => {
                                    if (!isPaused) resolve();
                                };
                                audio.onerror = reject;
                            })
                            .catch(reject);
                    });
                }

                // 解析流数据
                function parseStreamData(line) {
                    try {
                        return JSON.parse(line);
                    } catch (e) {
                        console.error('解析错误:', e, '原始数据:', line);
                        return { error: e.message };
                    }
                }

                // 创建音频片段
                function createAudioChunk(data) {
                    let audioData = data.audio;
                    if (!audioData.startsWith('data:')) {
                        audioData = `data:audio/wav;base64,${audioData}`;
                    }
                    return {
                        ...data,
                        audio: audioData,
                        timestamp: Date.now()
                    };
                }

                // 按顺序插入队列
                function insertInOrder(queue, chunk) {
                    let index = 0;
                    while (index < queue.length && queue[index].index < chunk.index) {
                        index++;
                    }
                    queue.splice(index, 0, chunk);
                }

                // 开始转换（同域代理，保持流式逐句播放）
                async function startConversion(fullText) {
                    const loadingIndicator = document.getElementById('loading-indicator');
                    try {
                        stopCurrentPlayback(false);
                        playbackHighlightContext = buildPlaybackHighlightContext(fullText);
                        const response = await fetch('/generate', {
                            method: 'POST',
                            headers: { 'Content-Type': 'application/json' },
                            body: JSON.stringify({ user_input: fullText, voice: "af_heart", speed: 1.0 })
                        });

                        if (!response.ok) throw new Error(`服务器错误: ${response.status}`);

                        const reader = response.body.getReader();
                        activeStreamReader = reader;
                        const decoder = new TextDecoder();
                        let buffer = '';
                        const audioQueue = [];
                        let expectedIndex = 0;

                        const playController = new AbortController();
                        activePlayController = playController;
                        const playPromise = playAudioSequentially(audioQueue, playController.signal);

                        while (true) {
                            const { done, value } = await reader.read();
                            if (done) break;

                            buffer += decoder.decode(value, { stream: true });
                            const lines = buffer.split('\n');
                            buffer = lines.pop() || '';

                            for (const line of lines) {
                                if (!line.trim()) continue;
                                const data = parseStreamData(line);
                                if (data.error) {
                                    throw new Error(data.error);
                                }
                                if (data.audio) {
                                    insertInOrder(audioQueue, createAudioChunk(data));
                                }
                            }
                        }

                        if (buffer.trim()) {
                            const data = parseStreamData(buffer.trim());
                            if (data.audio) {
                                insertInOrder(audioQueue, createAudioChunk(data));
                            }
                        }

                        audioQueue.push(null);
                        await playPromise;
                        clearActiveTtsHighlight();
                        activePlayController = null;
                        activeStreamReader = null;
                        playbackHighlightContext = null;

                    } catch (error) {
                        clearActiveTtsHighlight();
                        playbackHighlightContext = null;
                        activePlayController = null;
                        activeStreamReader = null;
                        if (error.name === 'AbortError') {
                            return;
                        }
                        console.error(error);
                        loadingIndicator.textContent = `错误: ${error.message}`;
                        loadingIndicator.style.display = 'block';
                    }
                }

                // 监听文本选择
                document.addEventListener('DOMContentLoaded', () => {
                    const loadingIndicator = document.getElementById('loading-indicator');

                    document.addEventListener('mouseup', async () => {
                        if (!isListening) return;

                        const selection = window.getSelection();
                        const selectedText = selection.toString().trim();
                        if (selectedText.length === 0) return;

                        selection.removeAllRanges();

                        try {
                            initAudioContext();
                            await getPlayPermission();
                            loadingIndicator.textContent = '正在转换选中文本...';
                            loadingIndicator.style.display = 'block';

                            await startConversion(selectedText);
                        } catch (error) {
                            console.error(error);
                            loadingIndicator.textContent = `错误: ${error.message}`;
                            loadingIndicator.style.display = 'block';
                        }
                    });
                });

                // 阅读整页
                readPageButton.addEventListener('click', async function () {
                    const { pdfViewer } = PDFViewerApplication;
                    const currentPageNumber = pdfViewer.currentPageNumber;
                    const loadingIndicator = document.getElementById('loading-indicator');

                    try {
                        initAudioContext();
                        await getPlayPermission();
                        loadingIndicator.textContent = '正在提取页面文本...';
                        loadingIndicator.style.display = 'block';

                        const pdfDocument = PDFViewerApplication.pdfDocument;
                        const page = await pdfDocument.getPage(currentPageNumber);
                        const textContent = await page.getTextContent();

                        // 提取完整文本，保留标点符号（不预分割）
                        let fullText = textContent.items.map(item => item.str).join(' ').trim();

                        const startContext = selectedStartContext || getSelectedContextOnPage();
                        if (startContext?.word) {
                            const startIndex = findNthOccurrence(fullText, startContext.word, startContext.occurrence);
                            if (startIndex >= 0) {
                                fullText = fullText.slice(startIndex).trim();
                            } else {
                                loadingIndicator.textContent = `未在当前页找到对应位置词：${startContext.word}，将从页首阅读`;
                                loadingIndicator.style.display = 'block';
                            }
                        }

                        if (fullText.length === 0) {
                            loadingIndicator.textContent = '页面无文本内容';
                            return;
                        }

                        await startConversion(fullText);
                    } catch (error) {
                        console.error(error);
                        loadingIndicator.textContent = `错误: ${error.message}`;
                        loadingIndicator.style.display = 'block';
                    }
                });
            </script>
</body>
</html>