body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #eff1f3 0%, #890127 100%)
            
            min-height: 100vh;
            color: #333;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
             background: none !important;
        }

        .header2 {
            text-align: center;
            margin-bottom: 30px;
            background: rgba(255, 255, 255, 0.95);
            padding: 30px;
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        }

        .header2 h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            background: #890127;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .header2 p {
            font-size: 1.2rem;
            color: #666;
            margin-bottom: 20px;
        }

        .stats {
            display: flex;
            justify-content: center;
            gap: 30px;
            flex-wrap: wrap;
        }

        .stat-item {
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            padding: 15px 25px;
            border-radius: 25px;
            font-weight: 600;
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
        }

        .navigation {
            background: rgba(255, 255, 255, 0.95);
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        .nav-controls {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .page-selector {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .page-selector label {
            font-weight: 600;
            color: #333;
        }

        .page-selector select {
            padding: 10px 15px;
            border: 2px solid #667eea;
            border-radius: 8px;
            font-size: 1rem;
            background: white;
            cursor: pointer;
        }

        .page-info {
            /*background: linear-gradient(45deg, #667eea, #764ba2);*/
            
            color: #2e2c2c;
            /*padding: 12px 20px;*/
            /*border-radius: 25px;*/
            font-weight: 600;
        }

        .nav-buttons {
            display: flex;
            gap: 10px;
        }

        .nav-btn {
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            /*background: linear-gradient(45deg, #667eea, #764ba2);*/
                background: linear-gradient(45deg, #51011c, #890127);
            color: white;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
        }

        .nav-btn:disabled {
            background: #bdc3c7;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .content-area {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            text-align: center;
        }

        .page-image {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            margin-bottom: 20px;
        }

        .loading {
            text-align: center;
            padding: 50px;
            font-size: 1.2rem;
            color: #7f8c8d;
        }

        .error {
            text-align: center;
            padding: 50px;
            font-size: 1.2rem;
            color: #e74c3c;
        }

        .zoom-controls {
            margin: 20px 0;
            display: flex;
            justify-content: center;
            gap: 10px;
        }

        .zoom-btn {
            padding: 8px 16px;
            border: none;
            border-radius: 6px;
            background: #667eea;
            color: white;
            cursor: pointer;
            font-size: 0.9rem;
            transition: all 0.3s ease;
        }

        .zoom-btn:hover {
            background: #5a67d8;
        }

        .image-container {
            overflow: auto;
            /*max-height: 80vh;*/
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            background: #f8f9fa;
        }

        .footer {
            text-align: center;
            margin-top: 30px;
            padding: 20px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 15px;
            color: white;
        }

        .keyboard-hint {
            margin-top: 15px;
            font-size: 0.9rem;
            color: #666;
            background: #f8f9fa;
            padding: 10px;
            border-radius: 8px;
        }

        /* 树状目录样式 */
        .tree-selector {
            margin-top: 20px;
        }

        .tree-selector label {
            font-weight: 600;
            color: #333;
            margin-bottom: 10px;
            display: block;
        }

        .tree-container {
            background: white;
            border: 2px solid #667eea;
            border-radius: 8px;
            padding: 10px;
            max-height: 300px;
            overflow-y: auto;
        }

        .tree-item {
            padding: 5px 0;
            cursor: pointer;
            user-select: none;
        }

        .tree-item[data-level="0"] {
            padding-left: 0;
        }

        .tree-item[data-level="1"] {
            padding-left: 20px;
        }

        .tree-item[data-level="2"] {
            padding-left: 40px;
        }

        .tree-toggle {
            margin-right: 5px;
            font-size: 14px;
            transition: transform 0.2s ease;
        }

        .tree-toggle.expanded {
            transform: rotate(90deg);
        }

        .tree-icon {
            margin-right: 5px;
            font-size: 14px;
        }

        .tree-label {
            font-size: 14px;
            color: #333;
        }

        .tree-item:hover .tree-label {
            color: #667eea;
            font-weight: 600;
        }

        .tree-item[data-level="2"]:hover {
            background-color: #f0f4ff;
            border-radius: 4px;
        }

        .tree-children {
            margin-top: 5px;
        }

        /* 目录样式 */
        .table-of-contents {
            background: rgba(255, 255, 255, 0.95);
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            text-align: center;
        }

        .table-of-contents h2 {
            font-size: 1.8rem;
            margin-bottom: 10px;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .table-of-contents p {
            font-size: 1.1rem;
            color: #666;
            margin-bottom: 20px;
        }

        .toc-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            justify-content: center;
        }

        .toc-item {
            cursor: pointer;
            transition: all 0.3s ease;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            position: relative;
        }

        .toc-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(102, 126, 234, 0.3);
        }

        .toc-item img {
            width: 100%;
            height: auto;
            display: block;
            border-radius: 10px;
            transition: all 0.3s ease;
        }

        .toc-item:hover img {
            filter: brightness(1.1);
        }

        .toc-label {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
            color: white;
            padding: 15px 10px 10px;
            font-weight: bold;
            text-align: center;
            border-bottom-left-radius: 10px;
            border-bottom-right-radius: 10px;
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }

            .nav-controls {
                flex-direction: column;
                align-items: stretch;
            }

            .stats {
                flex-direction: column;
                align-items: center;
            }

            .container {
                padding: 10px;
                background: none !important;
            }

            .nav-buttons {
                justify-content: center;
            }

            .table-of-contents h2 {
                font-size: 1.5rem;
            }

            .toc-grid {
                grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
                gap: 15px;
            }

            .toc-label {
                padding: 10px 8px 8px;
                font-size: 0.9rem;
            }
        }