:root {
            --bg-dark: #0f1117; /* 深蓝灰背景 */
            --bg-card: rgba(25, 28, 36, 0.95); /* 卡片背景 */
            --bg-hover: rgba(45, 50, 65, 0.85); /* 悬停背景 */
            --primary: #d4af37; /* 琥珀金主色 */
            --primary-dark: #b08d26; /* 深琥珀金 */
            --accent: #ffd700; /* 亮金色强调色 */
            --text-primary: #f0f0f8; /* 浅灰紫色文字 */
            --text-secondary: #a0a8c0; /* 浅灰蓝文字 */
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --transition: all 0.3s ease;
            --shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
            --glass: rgba(255, 255, 255, 0.05);
            --glow: 0 0 15px rgba(212, 175, 55, 0.3); /* 金色光晕 */
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        
        video {
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
            -webkit-user-drag: none;
            -khtml-user-drag: none;
            -moz-user-drag: none;
            -o-user-drag: none;
            /* `user-drag` 是非标准属性，已使用标准的 `-webkit-user-drag` 替代 */
            pointer-events: none;
        }
        
      
        #dplayer-container {
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
        }
        
      
        #dplayer-container video {
            pointer-events: none;
        }
        
        /* 导航菜单样式 */
        .nav-menu {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        /* Logo样式 */
        .nav-logo {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            text-decoration: none;
            /* 添加淡入动画 */
            animation: fadeIn 0.8s ease-out;
            animation-fill-mode: both;
            opacity: 0;
        }

        .nav-logo:hover {
            transform: scale(1.1);
            background: transparent;
        }

        .nav-logo .svg-icon {
            width: 28px;
            height: 28px;
            color: var(--primary);
            transition: all 0.3s ease;
        }

        .nav-logo:hover .svg-icon {
            color: var(--accent);
            transform: scale(1.1);
        }

        .nav-item {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            text-decoration: none;
            /* 添加淡入动画 */
            animation: fadeIn 0.8s ease-out;
            animation-fill-mode: both;
            opacity: 0;
        }

        .nav-item:hover {
            transform: scale(1.1);
            background: transparent;
        }

        /* 导航菜单悬停提示文字 */
        .nav-item::after {
            content: attr(title);
            position: absolute;
            bottom: -30px;
            left: 50%;
            transform: translateX(-50%);
            background: transparent;
            color: var(--primary);
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 12px;
            white-space: nowrap;
            z-index: 10;
            border: none;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }

        .nav-item:hover::after {
            opacity: 1;
        }

        .nav-item .svg-icon {
            width: 28px;
            height: 28px;
            color: var(--primary);
            transition: all 0.3s ease;
        }

        .nav-item:hover .svg-icon {
            color: var(--accent);
            transform: scale(1.1);
        }

        /* 隐藏Font Awesome图标 */
        .fa {
            display: none !important;
        }
        
        /* 为导航菜单项添加不同的动画延迟 */
        .nav-item:nth-child(1) { animation-delay: 0.1s; }
        .nav-item:nth-child(2) { animation-delay: 0.2s; }
        .nav-item:nth-child(3) { animation-delay: 0.3s; }
        .nav-item:nth-child(4) { animation-delay: 0.4s; }

        /* 二维码弹窗样式 */
        

        .about-content {
            text-align: left;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.6;
            margin: 15px 0;
        }

        .about-content p {
            margin-bottom: 10px;
        }

        .about-content p:last-child {
            margin-bottom: 0;
        }

        /* 图库页面样式 */
        .album-section {
            padding: 20px 0;
        }
        
        .album-header {
            text-align: center;
            margin-bottom: 40px;
        }
        
        .album-header h1 {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 10px;
            font-weight: 700;
        }
        
        .album-header p {
            color: var(--text-secondary);
            font-size: 18px;
        }
        
        .album-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
            max-width: 1300px;
            width: 100%;
            margin: 0 auto;
        }
        
        .album-item {
            background: rgba(25, 28, 36, 0.7);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
            cursor: pointer;
            position: relative;
            border: 1px solid rgba(212, 175, 55, 0.15);
            box-shadow: var(--shadow);
        }
        
        .album-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5);
            z-index: 2;
            border-color: var(--primary);
        }
        
        .album-image {
            width: 100%;
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        
        .album-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .album-item:hover .album-image img {
            transform: scale(1.05);
        }
        
        .album-info {
            padding: 15px;
            background: rgba(0, 0, 0, 0.3);
        }
        
        .album-info h3 {
            color: var(--primary);
            font-size: 18px;
            margin-bottom: 5px;
            font-weight: 600;
        }
        
        .album-info p {
            color: var(--text-secondary);
            font-size: 14px;
        }
        
        /* 回到顶部按钮样式 */
        .back-to-top {
            position: fixed;
            bottom: 100px;
            right: 20px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: rgba(212, 175, 55, 0.2);
            border: 1px solid rgba(212, 175, 55, 0.3);
            color: var(--primary);
            display: none;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            z-index: 999;
        }
        
        .back-to-top:hover {
            background: rgba(212, 175, 55, 0.4);
            transform: translateY(-5px);
        }
        
        .back-to-top i {
            font-size: 20px;
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .album-grid {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
                gap: 15px;
            }
            
            .album-header h1 {
                font-size: 28px;
            }
            
            .album-header p {
                font-size: 16px;
            }
            
            .album-image {
                height: 180px;
            }
        }

        

        body {
            background: linear-gradient(135deg, #0f1117 0%, #1a1d28 100%);
            color: var(--text-primary);
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            min-height: 100vh;
            padding: 15px 10px;
            overflow-x: hidden;
            line-height: 1.6;
        }
        
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 10% 20%, rgba(212, 175, 55, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 90% 80%, rgba(255, 215, 0, 0.05) 0%, transparent 40%);
            pointer-events: none;
            z-index: -2;
        }
        
        .container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        
        header {
    display: flex;
    align-items: center;
    justify-content: space-between;
   
    position: relative;
    z-index: 100;
    /* 添加淡入动画 */
    animation: fadeIn 0.8s ease-out;
    animation-fill-mode: both;
}
        
        
        
        
        
        
        
        /* DPlayer 自定义样式 */
        .player-section {
            border-radius: var(--radius-md);
            padding: 0;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid rgba(212, 175, 55, 0.2);
            background: #000;
            /* 添加缩放动画 */
            animation: zoomIn 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            animation-fill-mode: both;
            animation-delay: 0.3s;
        }
        

        
        #dplayer-container {
            width: 100%;
            border-radius: var(--radius-md);
            overflow: hidden;
            position: relative;
            transform: translateZ(0);
            aspect-ratio: 16/9;
            z-index: 10;
        }
        
        /* DPlayer 自定义主题色 */
        .dplayer .dplayer-controller .dplayer-bar-wrap .dplayer-bar .dplayer-played {
            background: var(--accent) !important;
        }
        
        .dplayer .dplayer-controller .dplayer-bar-wrap .dplayer-bar .dplayer-played::after {
            background: var(--accent) !important;
            border-color: var(--accent) !important;
        }
        
        .dplayer .dplayer-controller .dplayer-bar-wrap .dplayer-bar .dplayer-loaded {
            background: rgba(255, 255, 255, 0.3) !important;
        }
        
        .dplayer .dplayer-controller .dplayer-icons .dplayer-volume .dplayer-thumb {
            background: var(--accent) !important;
        }
        
        .dplayer .dplayer-controller .dplayer-icons .dplayer-setting .dplayer-setting-box .dplayer-setting-speed-item.dplayer-setting-speed-item-active {
            color: var(--accent) !important;
        }
        
        .dplayer .dplayer-controller .dplayer-icons .dplayer-play-icon {
            color: var(--accent) !important;
        }
        
        .dplayer .dplayer-controller .dplayer-icons .dplayer-volume .dplayer-volume-bar .dplayer-volume-bar-inner {
            background: var(--accent) !important;
        }
        
        /* 默认隐藏控制栏 */
        .dplayer .dplayer-controller {
            opacity: 0;
            visibility: hidden;
            transition: all 1s ease;
        }
        
        .dplayer.dplayer-hide-controller .dplayer-controller {
            opacity: 0;
            visibility: hidden;
        }
        
        .dplayer:hover .dplayer-controller {
            opacity: 1;
            visibility: visible;
        }
        
        /* 隐藏DPlayer右键菜单 */
        .dplayer .dplayer-menu {
            display: none !important;
        }
        
        /* 分类导航优化 */
        .categories-container {
            position: relative;
            padding: 0;
            /* 添加动画效果 */
            animation: slideDown 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            animation-fill-mode: both;
        }
        
        .categories-scroll {
            display: flex;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            gap: 10px;
            padding: 10px 5px;
            scroll-behavior: smooth;
            scroll-snap-type: x mandatory;
            scroll-padding: 10px;
            justify-content: center;
        }

        @media (max-width: 768px) {
            .categories-scroll {
                justify-content: flex-start;
            }
        }
        
        .categories-scroll::-webkit-scrollbar {
            display: none;
        }
        
        .category-btn {
    flex: 0 0 auto;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid rgba(212, 175, 55, 0.2);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 15px;
    white-space: nowrap;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0;
    /* 添加弹出动画效果 */
    animation: bounceIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    animation-fill-mode: both;
    opacity: 0;
}

/* 大屏幕上增加分类导航按钮的字体大小 */
@media (min-width: 1024px) {
    .category-btn {
        font-size: 16px;
    }
}

/* 分类导航按钮中的SVG图标样式 */
.category-btn .svg-icon {
    width: 16px !important;
    height: 16px !important;
    fill: currentColor !important;
    color: currentColor !important;
    transition: var(--transition);
    /* 重置全局SVG样式的影响 */
    vertical-align: baseline !important;
    /* 确保图标大小固定，不受em单位影响 */
    font-size: 16px !important;
    margin-right: 2px;
}
        
        .category-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.1), transparent);
            transform: translateX(-100%);
            transition: transform 0.6s ease;
        }
        
        .category-btn:hover {
            transform: translateY(-3px);
            color: var(--text-primary);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
            background: transparent;
            border-color: var(--primary);
        }
        
        .category-btn:hover::before {
            transform: translateX(100%);
        }
        
        .category-btn.active {
            background: transparent;
            color: white;
            box-shadow: var(--glow);
            transform: translateY(-2px);
            border-color: var(--accent);
        }
        
        /* 为分类按钮添加不同的动画延迟 */
        .category-btn:nth-child(1) { animation-delay: 0.1s; }
        .category-btn:nth-child(2) { animation-delay: 0.2s; }
        .category-btn:nth-child(3) { animation-delay: 0.3s; }
        .category-btn:nth-child(4) { animation-delay: 0.4s; }
        .category-btn:nth-child(5) { animation-delay: 0.5s; }
        .category-btn:nth-child(6) { animation-delay: 0.6s; }
        .category-btn:nth-child(7) { animation-delay: 0.7s; }
        .category-btn:nth-child(8) { animation-delay: 0.8s; }
        .category-btn:nth-child(9) { animation-delay: 0.9s; }
        .category-btn:nth-child(10) { animation-delay: 1.0s; }
        
        /* 视频列表优化 - 改为专辑列表样式 */
.videos-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    /* 添加动画效果 */
    animation: fadeInScale 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-origin: center;
    padding: 10px 0;
}
        
        /* 视频列表弹出动画 */
        @keyframes fadeInScale {
            0% {
                opacity: 0;
                transform: scale(0.8) translateY(20px);
            }
            50% {
                opacity: 0.8;
                transform: scale(1.05) translateY(-5px);
            }
            100% {
                opacity: 1;
                transform: scale(1) translateY(0);
            }
        }
        
        /* 分类导航滑入动画 */
        @keyframes slideDown {
            0% {
                opacity: 0;
                transform: translateY(-20px);
            }
            100% {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        /* 淡入动画 */
        @keyframes fadeIn {
            0% {
                opacity: 0;
            }
            100% {
                opacity: 1;
            }
        }
        
        /* 缩放动画 */
        @keyframes zoomIn {
            0% {
                opacity: 0;
                transform: scale(0.9);
            }
            100% {
                opacity: 1;
                transform: scale(1);
            }
        }
        
        
        
        .videos-list {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 15px;
            justify-items: center;
            max-width: 1400px;
            width: 100%;
            /* 添加硬件加速以优化iOS上的动画性能 */
            will-change: transform;
            transform: translateZ(0);
            backface-visibility: hidden;
            perspective: 1000px;
            /* 优化iOS上的渲染性能 */
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        .video-item {
            background: rgba(255, 255, 255, 0.05);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
            cursor: pointer;
            position: relative;
            border: 1px solid rgba(212, 175, 55, 0.2);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            z-index: 1;
            contain: layout; /* 添加性能优化 */
            will-change: transform; /* 优化变换性能 */
            transform: translateZ(0); /* 启用硬件加速 */
            /* 添加弹出动画效果 */
            animation: bounceIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
            animation-fill-mode: both;
            /* 为每个视频项添加不同的延迟，创建波浪效果 */
            opacity: 0;
        }
        
        /* 视频项弹出动画 */
        @keyframes bounceIn {
            0% {
                opacity: 0;
                transform: scale(0.3);
            }
            50% {
                opacity: 1;
                transform: scale(1.05);
            }
            70% {
                transform: scale(0.9);
            }
            100% {
                opacity: 1;
                transform: scale(1);
            }
        }
        
        /* 为视频项添加不同的动画延迟 */
        .video-item:nth-child(1) { animation-delay: 0.1s; }
        .video-item:nth-child(2) { animation-delay: 0.2s; }
        .video-item:nth-child(3) { animation-delay: 0.3s; }
        .video-item:nth-child(4) { animation-delay: 0.4s; }
        .video-item:nth-child(5) { animation-delay: 0.5s; }
        .video-item:nth-child(6) { animation-delay: 0.6s; }
        .video-item:nth-child(7) { animation-delay: 0.7s; }
        .video-item:nth-child(8) { animation-delay: 0.8s; }
        .video-item:nth-child(9) { animation-delay: 0.9s; }
        .video-item:nth-child(10) { animation-delay: 1.0s; }
        .video-item:nth-child(11) { animation-delay: 0.1s; }
        .video-item:nth-child(12) { animation-delay: 0.2s; }
        
        .video-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.2), transparent);
            transform: translateX(-100%);
            transition: transform 0.8s ease;
            z-index: 1;
            pointer-events: none;
        }
        
        .video-item:hover {
            background: rgba(212, 175, 55, 0.15);
            color: var(--primary);
            border: 1px solid rgba(212, 175, 55, 0.4);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4), 0 0 20px rgba(212, 175, 55, 0.4);
            z-index: 2;
            margin-top: -8px; /* 使用margin实现上浮效果 */
            margin-bottom: 8px; /* 补偿下方空间，避免布局偏移 */
        }
        
        .video-item:hover::before {
            transform: translateX(100%);
            transition-duration: 1s;
        }
        
        .thumbnail {
            width: 100%;
            aspect-ratio: 16/9;
            position: relative;
            overflow: hidden;
            margin-bottom: 0;
            flex-shrink: 0;
            transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
            border-radius: var(--radius-md) var(--radius-md) 0 0;
            transform-origin: center; /* 修改缩放原点为中心点向四周 */
            z-index: 1; /* 确保缩放图片在video-info之下 */
        }
        
        .thumbnail img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 1.2s ease;
        }
        
        .video-item:hover .thumbnail {
            transform: scale(1.1);
        }
        
        .video-item:hover .thumbnail img {
            filter: brightness(1.05);
        }
        
        .video-title {
            padding: 6px;
            text-align: center;
            border-top: 2px solid #fdd504;
            transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
            width: 100%;
            position: relative;
            z-index: 2; /* 确保黄线在缩放图片之上 */
            background: rgba(25, 28, 36, 0.95); /* 添加背景色，防止图片透过 */
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 2px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            transition: color 1.2s ease;
        }
        
        .video-item:hover .video-title {
            color: var(--primary);
            text-shadow: 0 0 10px rgba(212, 175, 55, 0.5);
        }
        
        .play-icon, .folder-icon {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 50px;
            height: 50px;
            background: rgba(212, 175, 55, 0.3);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: var(--transition);
            backdrop-filter: blur(5px);
            border: 2px solid rgba(255, 255, 255, 0.25);
            z-index: 3;
        }
        
        .play-icon .svg-icon,
        .folder-icon .svg-icon {
            width: 30px !important;
            height: 30px !important;
            fill: currentColor !important;
            color: white !important;
        }
        
        .video-item:hover .play-icon,
        .video-item:hover .folder-icon {
            opacity: 1;
            transform: translate(-50%, -50%) scale(1.1);
        }
        
        .play-icon i, .folder-icon i {
            font-size: 42px;
            color: white;
        }
        
        .play-icon i {
            margin-left: 5px;
        }
        
        /* 文件夹样式 */
        .folder-item .thumbnail::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }
        
        .folder-icon {
            background: rgba(212, 175, 55, 0.5);
        }
        
        .back-folder .folder-icon {
            background: rgba(212, 175, 55, 0.5);
        }
        
        .no-videos {
            grid-column: 1 / -1;
            text-align: center;
            padding: 40px 0;
            color: var(--text-secondary);
            font-size: 18px;
            background: transparent;
            border-radius: var(--radius-md);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
        }
        
        .no-videos i {
            font-size: 40px;
            color: var(--primary);
        }
        

        
        footer {
            text-align: center;
            padding: 30px 0 15px;
            color: var(--text-secondary);
            font-size: 14px;
        
            border-top: 1px solid rgba(212, 175, 55, 0.1);
            /* 添加淡入动画 */
            animation: fadeIn 1s ease-out;
            animation-fill-mode: both;
            animation-delay: 0.8s;
        }
        
       
        
        /* 兼容性提示 */
        .compatibility-alert {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(212, 175, 55, 0.9);
            color: #000;
            padding: 12px 25px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            z-index: 10000;
            font-weight: 500;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
            animation: slideUp 0.5s ease-out;
            display: none;
            white-space: nowrap;
            max-width: 90%;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        
        @keyframes slideUp {
            from { bottom: -50px; opacity: 0; }
            to { bottom: 20px; opacity: 1; }
        }
        
        .compatibility-alert i {
            font-size: 22px;
        }
        
        .compatibility-alert .close {
            background: none;
            border: none;
            color: #000;
            font-size: 20px;
            cursor: pointer;
            margin-left: 15px;
        }
        
        
        
        /* 响应式优化 */
        @media (max-width: 1200px) {
            .videos-list {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            }
        }
        
        
        
        @media (max-width: 788px) {
            body {
                padding: 15px 10px;
            }
            
            .videos-section {
                display: block;
            }
            
            .videos-list {
                grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
                gap: 15px;
                max-width: 100%;
            }
            
            .category-btn {
                padding: 8px 15px;
                font-size: 15px;
            }
            
            
            
            .player-section {
                padding: 0;
                border-radius: var(--radius-sm);
            }
            
            #dplayer-container {
                border-radius: var(--radius-sm);
            }
            
            .video-title {
                font-size: 13px;
                height: 38px;
            }
        }
        
        @media (max-width: 576px) {
            .videos-list {
                grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
                gap: 12px;
            }
            
            .category-btn {
                padding: 7px 12px;
                font-size: 15px;
            }
            
            
            
            .video-title {
                font-size: 12px;
                height: 36px;
            }
            
            .no-videos {
                font-size: 16px;
                padding: 30px 0;
            }
            
            .no-videos i {
                font-size: 35px;
            }
        }
        
        @media (max-width: 480px) {
            .videos-list {
               
                gap: 10px;
            }
            
            .category-btn {
                padding: 6px 10px;
                font-size: 15px;
            }
            
            
            
            .video-title {
                font-size: 13px;
                height: 44px;
            }
        }
        
        @media (max-width: 400px) {
            .videos-list {
                grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
            }
            
            .category-btn {
                padding: 5px 8px;
                font-size: 15px;
            }
        }

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-card);
    color: var(--primary);
    border: 1px solid rgba(212, 175, 55, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
    box-shadow: var(--shadow);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--bg-hover);
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.7);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.back-to-top .svg-icon {
    width: 24px !important;
    height: 24px !important;
    fill: currentColor !important;
    color: var(--primary) !important;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
    
    .back-to-top .svg-icon {
        width: 20px !important;
        height: 20px !important;
        fill: currentColor !important;
        color: var(--primary) !important;
    }
}