/* 亮色模式变量（默认） */
        :root {
            --bg-color: #f6f7f9;
            --text-color: #18191c;
            --card-bg: #fff;
            --card-border: #e5e9ef;
            --status-bg: #ecf9ff;
            --status-text: #025;
            --status-border: #00a1d6;
            --nav-btn-bg: #e0e0e0;
            --nav-btn-text: #333;
            --nav-btn-hover-bg: #00a1d6;
            --nav-btn-hover-text: white;
            --about-bg: white;
            --about-text: #333;
            --count-bg: #e8f4fd;
            --count-text: #666;
            --count-border: #00a1d6;
            --footer-bg: #f0f0f0;
            --footer-text: #444;
            --footer-border: #ddd;
            --cat-btn-bg: #e0e0e0;
            --cat-btn-text: #333;
            --cat-btn-hover-bg: #00a1d6;
            --cat-btn-hover-text: white;
            --cat-btn-active-bg: #00a1d6;
            --cat-btn-active-text: white;
            /* 新增搜索和排序变量 */
            --search-bg: white;
            --search-text: #333;
            --search-border: #ddd;
            --sort-btn-bg: #e0e0e0;
            --sort-btn-text: #333;
            --sort-btn-hover-bg: #00a1d6;
            --sort-btn-hover-text: white;
        }

        /* 暗色模式变量 */
        body.dark-mode {
            --bg-color: #1a1a1a;
            --text-color: #e0e0e0;
            --card-bg: #2d2d2d;
            --card-border: #444;
            --status-bg: #1e2a3a;
            --status-text: #a0d0ff;
            --status-border: #4a9eff;
            --nav-btn-bg: #3a3a3a;
            --nav-btn-text: #ccc;
            --nav-btn-hover-bg: #4a9eff;
            --nav-btn-hover-text: #fff;
            --about-bg: #2d2d2d;
            --about-text: #ddd;
            --count-bg: #2a3a4a;
            --count-text: #b0d0ff;
            --count-border: #4a9eff;
            --footer-bg: #2a2a2a;
            --footer-text: #aaa;
            --footer-border: #444;
            --cat-btn-bg: #3a3a3a;
            --cat-btn-text: #ccc;
            --cat-btn-hover-bg: #4a9eff;
            --cat-btn-hover-text: #fff;
            --cat-btn-active-bg: #4a9eff;
            --cat-btn-active-text: #fff;
            /* 暗色搜索和排序变量 */
            --search-bg: #2d2d2d;
            --search-text: #e0e0e0;
            --search-border: #444;
            --sort-btn-bg: #3a3a3a;
            --sort-btn-text: #ccc;
            --sort-btn-hover-bg: #4a9eff;
            --sort-btn-hover-text: #fff;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg-color);
            padding: 40px 20px;
            color: var(--text-color);
            transition: background-color 0.3s, color 0.3s;
            position: relative;
            min-height: 100vh;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }
        h1 {
            text-align: center;
            margin-bottom: 10px;
            font-weight: 600;
            font-size: 2rem;
            color: #00a1d6; /* 品牌色保持不变 */
        }
        .author-info {
            text-align: center;
            margin-bottom: 20px;
            color: #000;
            font-size: 1.8rem;
            font-weight: 500;
        }
        body.dark-mode .author-info {
            color: #fff;
        }
        .nav-bar {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 30px;
            position: relative;
        }
        .nav-btn {
            padding: 10px 25px;
            font-size: 1.1rem;
            border: none;
            background: var(--nav-btn-bg);
            color: var(--nav-btn-text);
            border-radius: 30px;
            cursor: pointer;
            transition: all 0.2s;
            font-weight: 500;
            min-width: 90px;
        }
        .nav-btn:hover {
            background: var(--nav-btn-hover-bg);
            color: var(--nav-btn-hover-text);
        }
        .nav-btn.active {
            background: var(--nav-btn-hover-bg);
            color: var(--nav-btn-hover-text);
            box-shadow: 0 4px 10px rgba(0,161,214,0.3);
        }

        /* 夜间模式切换按钮 */
        .theme-toggle {
            position: absolute;
            right: 0;
            top: 0;
            background: var(--nav-btn-bg);
            color: var(--nav-btn-text);
            border: none;
            border-radius: 30px;
            padding: 10px 20px;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.2s;
            z-index: 10;
        }
        .theme-toggle:hover {
            background: var(--nav-btn-hover-bg);
            color: var(--nav-btn-hover-text);
        }
        @media (max-width: 600px) {
            .theme-toggle {
                position: relative;
                margin-bottom: 10px;
                width: 100%;
            }
        }

        /* 回到顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--nav-btn-bg);
            color: var(--nav-btn-text);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            cursor: pointer;
            border: 1px solid var(--card-border);
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s, visibility 0.3s, background 0.2s;
            z-index: 100;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--nav-btn-hover-bg);
            color: var(--nav-btn-hover-text);
        }

        .page {
            display: none;
        }
        .page.active-page {
            display: block;
        }
        .home-content {
            background: var(--about-bg);
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            text-align: center;
            font-size: 1.2rem;
            line-height: 1.8;
            color: var(--about-text);
        }
        .home-content p {
            margin: 20px 0;
        }
        .about-content, .changelog-content {
            background: var(--about-bg);
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            font-size: 1.1rem;
            line-height: 1.8;
            color: var(--about-text);
        }
        .about-content h2, .changelog-content h2 {
            color: #00a1d6;
            margin-bottom: 20px;
            font-size: 1.8rem;
            text-align: center;
        }
        .about-content p, .changelog-content p {
            margin-bottom: 20px;
        }
        .about-content ul, .changelog-content ul {
            margin-left: 40px;
            margin-bottom: 20px;
        }
        .video-count {
            text-align: center;
            margin-bottom: 20px;
            font-size: 1.1rem;
            color: var(--count-text);
            background: var(--count-bg);
            padding: 8px;
            border-radius: 8px;
            border-left: 4px solid var(--count-border);
        }
        /* 分类筛选按钮样式 */
        .category-filter {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 20px;
        }
        .cat-btn {
            padding: 8px 16px;
            font-size: 0.95rem;
            border: 1px solid var(--card-border);
            background: var(--cat-btn-bg);
            color: var(--cat-btn-text);
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.2s;
        }
        .cat-btn:hover {
            background: var(--cat-btn-hover-bg);
            color: var(--cat-btn-hover-text);
            border-color: var(--cat-btn-hover-bg);
        }
        .cat-btn.active {
            background: var(--cat-btn-active-bg);
            color: var(--cat-btn-active-text);
            border-color: var(--cat-btn-active-bg);
        }
        /* 搜索和排序控件 */
        .video-controls {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            gap: 15px;
            margin-bottom: 20px;
        }
        .search-box {
            flex: 1 1 250px;
            max-width: 300px;
            padding: 8px 15px;
            font-size: 1rem;
            border: 1px solid var(--search-border);
            border-radius: 30px;
            background: var(--search-bg);
            color: var(--search-text);
            outline: none;
            transition: border-color 0.2s;
        }
        .search-box:focus {
            border-color: var(--status-border);
        }
        .sort-buttons {
            display: flex;
            gap: 10px;
        }
        .sort-btn {
            padding: 8px 20px;
            font-size: 0.95rem;
            border: 1px solid var(--card-border);
            background: var(--sort-btn-bg);
            color: var(--sort-btn-text);
            border-radius: 30px;
            cursor: pointer;
            transition: all 0.2s;
        }
        .sort-btn:hover {
            background: var(--sort-btn-hover-bg);
            color: var(--sort-btn-hover-text);
            border-color: var(--sort-btn-hover-bg);
        }
        .sort-btn.active {
            background: var(--sort-btn-hover-bg);
            color: var(--sort-btn-hover-text);
            border-color: var(--sort-btn-hover-bg);
        }
        .video-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .video-card {
            background: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            cursor: pointer;
            border: 1px solid var(--card-border);
        }
        .video-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0,161,214,0.15);
            border-color: #00a1d6;
        }
        .cover-wrapper {
            position: relative;
            width: 100%;
            aspect-ratio: 16/9;
            background: #e5e9ef;
        }
        .video-cover {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        .duration-badge {
            position: absolute;
            bottom: 8px;
            right: 8px;
            background: rgba(0,0,0,0.7);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 500;
            backdrop-filter: blur(2px);
        }
        .video-info {
            padding: 16px;
        }
        .video-title {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            line-clamp: 2;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            color: var(--text-color);
        }
        .video-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.85rem;
            color: var(--count-text);
        }
        .meta-item {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .bv-text {
            font-size: 0.75rem;
            color: #c0c4cc;
            margin-top: 8px;
            padding-top: 8px;
            border-top: 1px solid var(--card-border);
            word-break: break-all;
        }
        .status-note {
            margin-top: 40px;
            padding: 20px;
            background: var(--status-bg);
            border-radius: 8px;
            font-size: 0.9rem;
            color: var(--status-text);
            border-left: 4px solid var(--status-border);
        }
        .status-note pre {
            background: #fff;
            padding: 12px;
            border-radius: 6px;
            margin: 12px 0;
            overflow-x: auto;
            border: 1px solid #b8e2f2;
        }
        /* 建站统计区域 */
        .site-stats {
            margin-top: 20px;
            padding: 16px 20px;
            background: var(--footer-bg);
            border-radius: 8px;
            font-size: 0.9rem;
            color: var(--footer-text);
            text-align: center;
            border: 1px solid var(--footer-border);
        }
        .search-hint {
            text-align: center;
            margin: 5px 0 15px 0;       
            font-size: 0.9rem;
            color: var(--count-text);    
            opacity: 0.8;
            line-height: 1.4;
        }