/**
 * 2025 现代玻璃态风格 - 主样式文件
 * 百度SEO优化版本
 */

/* ========== CSS变量 - 渐变色彩系统 ========== */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    /* 毛玻璃效果增强 */
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-bg-strong: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-border-strong: rgba(255, 255, 255, 0.4);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    --glass-blur: blur(20px);
    --glass-blur-strong: blur(30px);
    
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8a8aaa;
    
    /* 动态渐变背景 - 增强毛玻璃视觉效果 */
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --card-bg: rgba(255, 255, 255, 0.2);
    --card-bg-strong: rgba(255, 255, 255, 0.35);
    --card-hover: rgba(255, 255, 255, 0.4);
    
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --border-radius-lg: 24px;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== 全局样式 ========== */
* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
}

/* 动态背景装饰 - 增强毛玻璃视觉效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(102, 126, 234, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(240, 147, 251, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(118, 75, 162, 0.3) 0%, transparent 60%);
    z-index: -2;
    animation: bgFloat 20s ease-in-out infinite;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 70% 20%, rgba(79, 172, 254, 0.3) 0%, transparent 40%),
        radial-gradient(circle at 30% 80%, rgba(245, 87, 108, 0.3) 0%, transparent 40%);
    z-index: -1;
    animation: bgFloat 25s ease-in-out infinite reverse;
}

@keyframes bgFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    font-size: 16px; 
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
    position: relative;
}

a { 
    text-decoration: none; 
    color: inherit;
    transition: all var(--transition-fast);
}

.container { 
    max-width: 1400px; 
    margin: 0 auto; 
    padding: 0 20px; 
}

/* ========== 玻璃态头部 ========== */
.header { 
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    border-bottom: 1px solid var(--glass-border-strong);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--glass-shadow);
}

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

.logo { 
    font-size: 24px; 
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    padding: 8px 0;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

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

.nav a { 
    color: var(--text-primary);
    padding: 10px 18px;
    min-height: 44px;
    display: flex;
    align-items: center;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: -1;
}

.nav a:hover {
    color: #fff;
    transform: translateY(-2px);
}

.nav a:hover::before {
    opacity: 1;
}

.search-form { 
    display: flex; 
    gap: 10px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    padding: 8px;
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border-strong);
}

.search-form input { 
    padding: 10px 18px; 
    border: none; 
    border-radius: var(--border-radius-sm);
    width: 280px; 
    min-height: 40px; 
    font-size: 15px;
    background: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-fast);
}

.search-form input:focus {
    outline: none;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.search-form button { 
    padding: 10px 24px; 
    background: var(--primary-gradient);
    color: #fff; 
    border: none; 
    border-radius: var(--border-radius-sm);
    cursor: pointer; 
    min-height: 40px; 
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition-fast);
}

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

/* ========== 广告位 - 玻璃态 ========== */
.ad-header { 
    margin: 20px auto; 
    text-align: center;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    border-radius: var(--border-radius);
    padding: 15px;
    border: 1px solid var(--glass-border-strong);
}

.ad-header img { 
    max-width: 960px; 
    width: 100%; 
    height: auto;
    border-radius: var(--border-radius-sm);
}

.ad-header-category { 
    margin: 15px auto; 
    text-align: center; 
    max-width: 960px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    border-radius: var(--border-radius);
    padding: 15px;
    border: 1px solid var(--glass-border-strong);
}

.ad-sidebar { 
    margin: 20px 0; 
    text-align: center;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    border-radius: var(--border-radius);
    padding: 15px;
    border: 1px solid var(--glass-border-strong);
}

.ad-footer { 
    margin: 20px auto; 
    text-align: center; 
    max-width: 960px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    border-radius: var(--border-radius);
    padding: 15px;
    border: 1px solid var(--glass-border-strong);
}

.ad-footer img { 
    max-width: 960px; 
    width: 100%; 
    height: auto;
    border-radius: var(--border-radius-sm);
}

/* ========== 广告卡片 - 玻璃态 ========== */
.ad-card { 
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all var(--transition-normal);
}

.ad-card:hover { 
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.ad-card-cover { 
    position: relative; 
    padding-top: 56.25%; 
    background: var(--primary-gradient);
}

.ad-card-cover img { 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    object-fit: cover;
}

.ad-card-label { 
    position: absolute; 
    top: 12px; 
    right: 12px; 
    background: var(--secondary-gradient);
    color: #fff; 
    padding: 6px 12px; 
    font-size: 12px;
    border-radius: 20px;
    z-index: 10;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(245, 87, 108, 0.3);
}

.ad-card-content { 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    display: flex; 
    align-items: center; 
    justify-content: center;
    padding: 20px;
}

/* ========== 主内容区 ========== */
.main-content { 
    display: flex; 
    gap: 24px; 
    margin-top: 24px;
}

.content-left { 
    flex: 1;
    min-width: 0;
}

.content-right { 
    width: 320px;
    flex-shrink: 0;
}

/* ========== 板块标题 - 渐变 ========== */
.section-title { 
    font-size: 22px;
    margin-bottom: 20px;
    padding-left: 18px;
    border-left: 4px solid transparent;
    border-image: var(--primary-gradient) 1;
    line-height: 1.3;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h1, h2, h3 { 
    line-height: 1.3; 
    margin-bottom: 12px;
    font-weight: 700;
}

/* ========== 视频网格 - 玻璃态卡片 ========== */
.video-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); 
    gap: 24px; 
    margin-bottom: 32px;
}

.video-card { 
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--border-radius);
    overflow: hidden;
    touch-action: manipulation;
    will-change: transform;
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all var(--transition-normal);
}

.video-card:hover { 
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    background: var(--card-hover);
    border-color: var(--glass-border-strong);
}

.video-card.loaded { 
    opacity: 1;
}

.video-cover { 
    position: relative; 
    padding-top: 56.25%; 
    background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
    overflow: hidden;
}

.video-cover::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.video-cover img { 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.video-card:hover .video-cover img {
    transform: scale(1.08);
}

.video-info { 
    padding: 16px; 
    flex: 1; 
    display: flex; 
    flex-direction: column; 
    justify-content: space-between;
}

.video-title { 
    font-size: 15px;
    margin-bottom: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 1.4;
    font-weight: 600;
    color: var(--text-primary);
}

.video-meta { 
    display: flex; 
    justify-content: space-between; 
    font-size: 13px;
    color: var(--text-muted);
    flex-shrink: 0;
    gap: 10px;
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ========== 侧边栏 - 玻璃态 ========== */
.sidebar-box { 
    background: var(--card-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 24px;
    border: 1px solid var(--glass-border-strong);
    box-shadow: var(--glass-shadow);
}

.sidebar-title {
    font-size: 18px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid transparent;
    border-image: var(--primary-gradient) 1;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.video-list { 
    list-style: none;
}

.video-list li { 
    padding: 12px 0; 
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-fast);
}

.video-list li:last-child { 
    border-bottom: none;
}

.video-list li:hover {
    padding-left: 8px;
}

.video-list a { 
    display: flex; 
    gap: 12px;
    align-items: center;
}

.video-list img { 
    width: 100px; 
    height: 65px; 
    object-fit: cover; 
    border-radius: var(--border-radius-sm);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.video-list-title { 
    font-size: 14px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-weight: 500;
}

/* ========== 分类标签 - 玻璃态 ========== */
.category-tags { 
    display: flex; 
    gap: 12px; 
    flex-wrap: wrap; 
    margin-bottom: 24px;
}

.category-tag { 
    padding: 10px 22px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 25px;
    font-size: 14px;
    transition: all var(--transition-fast);
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--glass-border-strong);
    font-weight: 500;
}

.category-tag:hover, 
.category-tag.active { 
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

/* ========== 底部 - 玻璃态 ========== */
.footer { 
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    color: var(--text-secondary);
    padding: 40px 0;
    margin-top: 60px;
    text-align: center;
    border-top: 1px solid var(--glass-border-strong);
}

.footer p { 
    margin-bottom: 12px;
    text-align: center;
}

.footer a { 
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    padding: 4px 8px;
    border-radius: 6px;
}

.footer a:hover { 
    color: #fff;
    background: var(--primary-gradient);
}

/* ========== 页面标题 ========== */
.page-title { 
    padding: 32px 0;
    font-size: 32px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

/* ========== 播放页专用 ========== */
.player-section {
    margin-top: 24px;
}

.player-container {
    display: flex;
    gap: 24px;
}

.player-main {
    flex: 1;
    min-width: 0;
}

.player-sidebar {
    width: 320px;
    flex-shrink: 0;
}

.video-player {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    background: #000;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.video-player video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-info {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    padding: 24px;
    border-radius: var(--border-radius);
    margin-top: 20px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.video-info .video-title {
    font-size: 24px;
    margin-bottom: 16px;
    white-space: normal;
    line-height: 1.4;
}

.video-desc {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
    line-height: 1.8;
}

.video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.video-tag {
    padding: 6px 14px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 20px;
    font-size: 13px;
    border: 1px solid var(--glass-border-strong);
    transition: all var(--transition-fast);
}

.video-tag:hover {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.related-section {
    margin-top: 32px;
}

.related-title-main {
    font-size: 22px;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.related-list {
    list-style: none;
}

.related-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--glass-border);
}

.related-list a {
    display: flex;
    gap: 12px;
    align-items: center;
}

.related-list img {
    width: 120px;
    height: 75px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
}

.related-title {
    font-size: 14px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
    padding: 16px 0;
    font-size: 14px;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.breadcrumb a:hover {
    color: #667eea;
}

/* ========== 分页 - 玻璃态 ========== */
.page-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin: 40px 0;
    flex-wrap: wrap;
}

.page-btn {
    padding: 10px 18px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}

.page-btn:hover {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.page-btn.current {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
}

.page-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-info {
    padding: 10px 18px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ========== 返回按钮 ========== */
.back-btn {
    padding: 10px 20px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.back-btn:hover {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

/* ========== 播放前广告 ========== */
.pre-ad {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.pre-ad-content {
    max-width: 80%;
    max-height: 70%;
}

.pre-ad-timer {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    padding: 10px 20px;
    border-radius: 25px;
    color: #fff;
    font-weight: 600;
    border: 1px solid var(--glass-border);
}

.pre-ad-skip {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: var(--primary-gradient);
    padding: 12px 28px;
    border-radius: 25px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pre-ad-skip:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

/* ========== 暂停广告 ========== */
.pause-ad {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    z-index: 99;
    display: none;
}

/* ========== 汉堡按钮 ========== */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    transition: all var(--transition-fast);
}

.hamburger:hover {
    background: var(--primary-gradient);
    border-color: transparent;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: all var(--transition-fast);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(3px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(3px, -5px);
}

/* ========== 导航下拉菜单 ========== */
.nav-dropdown { 
    position: relative; 
    display: inline-block;
}

.dropdown-toggle { 
    color: var(--text-primary);
    transition: all var(--transition-fast);
    padding: 10px 18px;
    min-height: 44px;
    display: flex;
    align-items: center;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
}

.dropdown-toggle:hover { 
    background: var(--primary-gradient);
    color: #fff;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-radius: var(--border-radius);
    min-width: 200px;
    z-index: 1000;
    padding: 12px 0;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--glass-border);
    margin-top: 8px;
}

.dropdown-menu a {
    color: var(--text-primary);
    padding: 12px 24px;
    display: block;
    transition: all var(--transition-fast);
    font-size: 14px;
    white-space: nowrap;
}

.dropdown-menu a:hover {
    background: var(--primary-gradient);
    color: #fff;
    padding-left: 28px;
}

.nav-dropdown:hover .dropdown-menu { 
    display: block;
    animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== 移动端响应式 - 百度SEO优化 ========== */
@media screen and (max-width: 768px) {
    .container { 
        padding: 0 12px; 
    }
    
    .header-content { 
        flex-direction: row; 
        flex-wrap: wrap; 
        gap: 12px;
        position: relative;
    }
    
    .logo { 
        font-size: 20px;
        margin-bottom: 0;
        display: block;
        padding: 8px 0;
        flex: 1;
    }
    
    .hamburger { 
        display: flex;
        order: 2;
    }
    
    .nav { 
        display: none;
        width: 100%;
        order: 3;
        flex-direction: column;
        gap: 0;
        font-size: 14px;
        background: var(--card-bg);
        backdrop-filter: var(--glass-blur);
        border-radius: var(--border-radius);
        overflow: hidden;
        border: 1px solid var(--glass-border);
        margin-top: 12px;
    }
    
    .nav.active { 
        display: flex;
        animation: slideDown 0.3s ease;
    }
    
    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    .nav a { 
        padding: 14px 20px;
        min-height: 44px;
        display: flex;
        align-items: center;
        border-bottom: 1px solid var(--glass-border);
    }
    
    .nav a:last-child { 
        border-bottom: none;
    }
    
    .search-form { 
        width: 100%;
        order: 4;
        flex-direction: column;
        margin-top: 12px;
    }
    
    .search-form input { 
        width: 100%;
        max-width: 100%;
        min-height: 44px;
        font-size: 16px;
    }
    
    .search-form button { 
        padding: 12px 24px;
        min-height: 44px;
        font-size: 16px;
    }
    
    .main-content { 
        flex-direction: column;
        gap: 20px;
    }
    
    .content-left { 
        width: 100%;
    }
    
    .content-right { 
        width: 100%;
    }
    
    .sidebar-box { 
        display: none;
    }
    
    .ad-sidebar { 
        display: none;
    }
    
    .video-grid { 
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .video-card { 
        border-radius: var(--border-radius-sm);
    }
    
    .video-info { 
        padding: 10px;
    }
    
    .video-title { 
        font-size: 13px;
        line-height: 1.4;
        min-height: 36px;
    }
    
    .video-meta { 
        font-size: 11px;
    }
    
    .video-cover { 
        border-radius: var(--border-radius-sm);
    }
    
    .category-tags { 
        gap: 8px;
        overflow-x: auto;
        white-space: nowrap;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }
    
    .category-tag { 
        padding: 8px 18px;
        font-size: 13px;
        border-radius: 20px;
        min-height: 40px;
        display: inline-flex;
        align-items: center;
        flex-shrink: 0;
    }
    
    .section-title { 
        font-size: 18px;
        padding-left: 12px;
        margin-bottom: 16px;
    }
    
    .ad-footer img { 
        max-width: 100%;
        height: auto;
    }
    
    body { 
        font-size: 16px;
        line-height: 1.6;
    }
    
    h1, h2, h3 { 
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    .player-container {
        flex-direction: column;
    }
    
    .player-sidebar {
        width: 100%;
    }
    
    .page-title {
        font-size: 24px;
        padding: 24px 0;
    }
}

@media screen and (max-width: 480px) {
    .logo { 
        font-size: 18px;
        padding: 6px 0;
    }
    
    .nav a { 
        padding: 12px 16px;
        font-size: 13px;
    }
    
    .search-form input { 
        min-height: 40px;
        font-size: 14px;
    }
    
    .search-form button { 
        padding: 10px 18px;
        min-height: 40px;
    }
    
    .video-grid { 
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .video-title { 
        font-size: 12px;
        line-height: 1.3;
        min-height: 32px;
    }
    
    .category-tag { 
        padding: 6px 14px;
        font-size: 12px;
    }
    
    .section-title { 
        font-size: 16px;
    }
    
    .header { 
        padding: 10px 0;
    }
    
    .video-card { 
        margin-bottom: 10px;
    }
    
    .video-info .video-title {
        font-size: 18px;
    }
}

@media (hover: none) and (pointer: coarse) {
    a, button { 
        min-height: 44px;
    }
    
    .video-card { 
        touch-action: manipulation;
    }
}

/* ========== 加载动画 ========== */
@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8