/* ============================================
   91 修车改装视频社区 - 原创样式表
   品牌：91 | 域名：wglnq2.cn
   原创配色方案：赛车红 + 深海蓝 + 琥珀橙
   ============================================ */

/* === CSS Variables === */
:root {
  --primary: #E63946;
  --primary-dark: #C62828;
  --secondary: #1D3557;
  --accent: #F4A261;
  --accent-light: #F7C59F;
  --bg-dark: #0D1117;
  --bg-card: #161B22;
  --bg-card-hover: #1C2333;
  --text-primary: #F1FAEE;
  --text-secondary: #A8DADC;
  --text-muted: #6B7B8D;
  --border-color: #21262D;
  --gradient-primary: linear-gradient(135deg, #E63946 0%, #F4A261 100%);
  --gradient-dark: linear-gradient(180deg, #0D1117 0%, #161B22 100%);
  --gradient-hero: linear-gradient(135deg, rgba(13,17,23,0.85) 0%, rgba(29,53,87,0.75) 50%, rgba(13,17,23,0.9) 100%);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 40px rgba(230,57,70,0.2);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* === Container === */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1440px; margin: 0 auto; padding: 0 20px; }

/* === Header / Navigation === */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,17,23,0.92);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.site-header.scrolled { background: rgba(13,17,23,0.98); box-shadow: 0 2px 20px rgba(0,0,0,0.5); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1440px; margin: 0 auto; padding: 0 20px; height: 70px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 42px; width: auto; }
.logo-text { font-size: 1.5rem; font-weight: 800; color: var(--primary); letter-spacing: 1px; }
.logo-text span { color: var(--text-primary); }

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 500; color: var(--text-secondary);
  transition: var(--transition); white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-primary); background: rgba(230,57,70,0.12);
}

.mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-toggle span {
  display: block; width: 24px; height: 2px; background: var(--text-primary);
  margin: 6px 0; transition: var(--transition); border-radius: 2px;
}

/* === Search Bar === */
.search-bar-wrap {
  background: var(--bg-card); border-bottom: 1px solid var(--border-color);
  padding: 12px 0; margin-top: 70px;
}
.search-bar {
  max-width: 680px; margin: 0 auto; position: relative;
  display: flex; align-items: center;
}
.search-bar input {
  width: 100%; padding: 12px 50px 12px 20px;
  background: var(--bg-dark); border: 1px solid var(--border-color);
  border-radius: 50px; color: var(--text-primary);
  font-size: 0.95rem; outline: none; transition: var(--transition);
}
.search-bar input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(230,57,70,0.15); }
.search-bar input::placeholder { color: var(--text-muted); }
.search-bar button {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  background: var(--gradient-primary); border: none; border-radius: 50%;
  width: 38px; height: 38px; cursor: pointer; display: flex;
  align-items: center; justify-content: center; transition: var(--transition);
}
.search-bar button:hover { transform: translateY(-50%) scale(1.05); }
.search-bar button svg { width: 18px; height: 18px; fill: #fff; }

/* === Hero / Banner === */
.hero-section {
  position: relative; min-height: 75vh; display: flex;
  align-items: center; justify-content: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center;
  background-repeat: no-repeat;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: var(--gradient-hero);
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 860px; padding: 60px 20px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(230,57,70,0.15); border: 1px solid rgba(230,57,70,0.3);
  padding: 6px 18px; border-radius: 50px; margin-bottom: 24px;
  font-size: 0.85rem; color: var(--primary); font-weight: 600;
}
.hero-badge .dot { width: 8px; height: 8px; background: var(--primary); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }

.hero-content h1 {
  font-size: 3.2rem; font-weight: 900; line-height: 1.15;
  margin-bottom: 20px; letter-spacing: -0.5px;
}
.hero-content h1 .brand { color: var(--primary); }
.hero-content h1 .highlight { color: var(--accent); }
.hero-content p {
  font-size: 1.15rem; color: var(--text-secondary);
  margin-bottom: 36px; line-height: 1.8;
}
.hero-stats {
  display: flex; justify-content: center; gap: 48px;
  margin-top: 40px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2.2rem; font-weight: 800; color: var(--accent); display: block; }
.hero-stat .label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px; font-weight: 600;
  font-size: 0.95rem; cursor: pointer; transition: var(--transition);
  border: none; text-decoration: none;
}
.btn-primary {
  background: var(--gradient-primary); color: #fff;
  box-shadow: 0 4px 20px rgba(230,57,70,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(230,57,70,0.4); color: #fff; }
.btn-outline {
  background: transparent; color: var(--text-primary);
  border: 2px solid var(--border-color);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 10px 22px; font-size: 0.85rem; }

/* === Section Common === */
.section { padding: 80px 0; }
.section-dark { background: var(--bg-dark); }
.section-alt { background: var(--bg-card); }
.section-header { text-align: center; margin-bottom: 52px; }
.section-header .tag {
  display: inline-block; background: rgba(230,57,70,0.12);
  color: var(--primary); padding: 6px 18px; border-radius: 50px;
  font-size: 0.8rem; font-weight: 600; margin-bottom: 16px;
  letter-spacing: 1px; text-transform: uppercase;
}
.section-header h2 {
  font-size: 2.4rem; font-weight: 800; margin-bottom: 14px;
  line-height: 1.2;
}
.section-header h2 .brand { color: var(--primary); }
.section-header p { color: var(--text-secondary); font-size: 1.05rem; max-width: 640px; margin: 0 auto; }

/* === Video Card Grid === */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.video-card {
  background: var(--bg-card); border-radius: var(--radius);
  overflow: hidden; border: 1px solid var(--border-color);
  transition: var(--transition); cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px); border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-btn {
  position: absolute; inset: 0; display: flex;
  align-items: center; justify-content: center;
  background: rgba(0,0,0,0.35); opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn .play-icon {
  width: 64px; height: 64px; background: var(--primary);
  border-radius: 50%; display: flex; align-items: center;
  justify-content: center; box-shadow: 0 4px 20px rgba(230,57,70,0.5);
  transition: var(--transition);
}
.video-play-btn .play-icon:hover { transform: scale(1.1); }
.video-play-btn .play-icon svg { width: 28px; height: 28px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute; bottom: 10px; right: 10px;
  background: rgba(0,0,0,0.8); color: #fff; padding: 3px 8px;
  border-radius: 4px; font-size: 0.75rem; font-weight: 600;
}
.video-tag {
  position: absolute; top: 10px; left: 10px;
  background: var(--primary); color: #fff; padding: 4px 12px;
  border-radius: 4px; font-size: 0.72rem; font-weight: 600;
}
.video-info { padding: 16px; }
.video-info h3 {
  font-size: 1rem; font-weight: 700; margin-bottom: 8px;
  line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.video-meta {
  display: flex; align-items: center; gap: 16px;
  font-size: 0.8rem; color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 14px; height: 14px; fill: var(--text-muted); }

/* === Short Video / TikTok Style === */
.short-video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.short-video-card {
  position: relative; border-radius: var(--radius);
  overflow: hidden; aspect-ratio: 9/16; cursor: pointer;
  border: 1px solid var(--border-color); transition: var(--transition);
}
.short-video-card:hover { transform: translateY(-4px); border-color: var(--primary); }
.short-video-card img { width: 100%; height: 100%; object-fit: cover; }
.short-video-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(transparent 50%, rgba(0,0,0,0.8) 100%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 16px; opacity: 0; transition: var(--transition);
}
.short-video-card:hover .short-video-overlay { opacity: 1; }
.short-video-overlay h4 { font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.short-video-overlay .views { font-size: 0.75rem; color: var(--text-muted); }
.short-play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 48px; height: 48px; background: rgba(230,57,70,0.9);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition);
}
.short-video-card:hover .short-play-btn { opacity: 1; }
.short-play-btn svg { width: 22px; height: 22px; fill: #fff; margin-left: 2px; }

/* === AI Section === */
.ai-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.ai-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 32px; transition: var(--transition);
  position: relative; overflow: hidden;
}
.ai-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--gradient-primary); opacity: 0;
  transition: var(--transition);
}
.ai-card:hover { transform: translateY(-4px); border-color: var(--primary); }
.ai-card:hover::before { opacity: 1; }
.ai-card .icon {
  width: 56px; height: 56px; background: rgba(230,57,70,0.1);
  border-radius: var(--radius-sm); display: flex; align-items: center;
  justify-content: center; margin-bottom: 20px;
}
.ai-card .icon svg { width: 28px; height: 28px; fill: var(--primary); }
.ai-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.ai-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }

/* === Expert / Team === */
.expert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.expert-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); overflow: hidden; text-align: center;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow-hover); }
.expert-avatar {
  width: 120px; height: 120px; border-radius: 50%; margin: 28px auto 16px;
  overflow: hidden; border: 3px solid var(--primary);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.expert-card .role { color: var(--primary); font-size: 0.85rem; font-weight: 600; margin-bottom: 12px; }
.expert-card .desc { color: var(--text-secondary); font-size: 0.85rem; padding: 0 20px; margin-bottom: 16px; line-height: 1.6; }
.expert-card .awards { font-size: 0.78rem; color: var(--accent); padding: 0 20px; margin-bottom: 16px; }
.expert-links { display: flex; justify-content: center; gap: 12px; padding: 0 20px 24px; }
.expert-links a {
  padding: 8px 18px; border-radius: 50px; font-size: 0.8rem;
  font-weight: 600; transition: var(--transition);
}
.expert-links .link-work { background: rgba(230,57,70,0.12); color: var(--primary); }
.expert-links .link-work:hover { background: var(--primary); color: #fff; }
.expert-links .link-contact { background: rgba(244,162,97,0.12); color: var(--accent); }
.expert-links .link-contact:hover { background: var(--accent); color: var(--bg-dark); }

/* === Brand Wall === */
.brand-wall {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 32px; padding: 20px 0;
}
.brand-wall-item {
  width: 140px; height: 70px; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 700; color: var(--text-muted);
  transition: var(--transition);
}
.brand-wall-item:hover { border-color: var(--accent); color: var(--accent); transform: scale(1.05); }

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); margin-bottom: 12px; overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--primary); }
.faq-question {
  padding: 20px 24px; cursor: pointer; display: flex;
  align-items: center; justify-content: space-between;
  font-weight: 600; font-size: 1rem; transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-question .arrow {
  width: 24px; height: 24px; transition: transform 0.3s ease;
  fill: var(--text-muted); flex-shrink: 0;
}
.faq-item.active .faq-question .arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px; color: var(--text-secondary);
  font-size: 0.92rem; line-height: 1.8;
}

/* === Reviews / Testimonials === */
.review-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.review-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 28px; transition: var(--transition);
}
.review-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.review-stars { color: var(--accent); font-size: 0.9rem; margin-bottom: 14px; letter-spacing: 2px; }
.review-text { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.8; margin-bottom: 18px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-author .avatar {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--gradient-primary); display: flex;
  align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem; color: #fff;
}
.review-author .name { font-weight: 600; font-size: 0.9rem; }
.review-author .date { font-size: 0.78rem; color: var(--text-muted); }

/* === Contact === */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 32px; }
.contact-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 32px; text-align: center;
}
.contact-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; color: var(--accent); }
.contact-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.8; margin-bottom: 8px; }
.contact-card .qr-img { width: 140px; height: 140px; margin: 16px auto 0; border-radius: var(--radius-sm); overflow: hidden; }
.contact-card .qr-img img { width: 100%; height: 100%; object-fit: cover; }

/* === Community Guide === */
.guide-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.guide-step {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 28px; text-align: center;
  transition: var(--transition); position: relative;
}
.guide-step:hover { border-color: var(--primary); transform: translateY(-3px); }
.guide-step .step-num {
  width: 48px; height: 48px; background: var(--gradient-primary);
  border-radius: 50%; display: flex; align-items: center;
  justify-content: center; font-weight: 800; font-size: 1.2rem;
  color: #fff; margin: 0 auto 16px;
}
.guide-step h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.guide-step p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.7; }

/* === Social Share === */
.share-bar {
  display: flex; justify-content: center; gap: 16px;
  flex-wrap: wrap; padding: 20px 0;
}
.share-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 50px; font-size: 0.85rem;
  font-weight: 600; transition: var(--transition); cursor: pointer;
  border: 1px solid var(--border-color); color: var(--text-secondary);
  background: var(--bg-card);
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* === Footer === */
.site-footer {
  background: var(--bg-card); border-top: 1px solid var(--border-color);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px; margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 1rem; font-weight: 700; margin-bottom: 18px;
  color: var(--text-primary); position: relative; padding-bottom: 10px;
}
.footer-col h4::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 32px; height: 3px; background: var(--primary); border-radius: 2px;
}
.footer-col p, .footer-col a {
  color: var(--text-secondary); font-size: 0.88rem; line-height: 2;
}
.footer-col a:hover { color: var(--primary); }
.footer-col .footer-logo { margin-bottom: 14px; }
.footer-col .footer-logo img { height: 36px; }
.footer-qr { display: flex; gap: 20px; margin-top: 12px; }
.footer-qr .qr-item { text-align: center; }
.footer-qr .qr-item img { width: 100px; height: 100px; border-radius: var(--radius-sm); margin-bottom: 6px; }
.footer-qr .qr-item span { font-size: 0.75rem; color: var(--text-muted); }

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 0; text-align: center;
  font-size: 0.82rem; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }

/* === Breadcrumb === */
.breadcrumb {
  padding: 16px 0; font-size: 0.85rem; color: var(--text-muted);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* === Page Header === */
.page-header {
  padding: 100px 0 50px; text-align: center;
  background: var(--gradient-dark); position: relative;
}
.page-header h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 12px; }
.page-header h1 .brand { color: var(--primary); }
.page-header p { color: var(--text-secondary); font-size: 1.05rem; }

/* === MCP Embed === */
.mcp-embed {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 24px; margin: 20px 0;
  text-align: center;
}
.mcp-embed h4 { font-size: 1rem; margin-bottom: 12px; color: var(--accent); }
.mcp-embed .mcp-status {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 20px; background: rgba(76,175,80,0.1);
  border: 1px solid rgba(76,175,80,0.3); border-radius: 50px;
  color: #4CAF50; font-size: 0.85rem; font-weight: 600;
}
.mcp-embed .mcp-status .dot {
  width: 8px; height: 8px; background: #4CAF50;
  border-radius: 50%; animation: pulse 2s infinite;
}

/* === Tag Cloud === */
.section-tags {
  background: var(--bg-card); padding: 18px 0;
  border-bottom: 1px solid var(--border-color);
}
.tag-cloud {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px;
}
.cloud-tag {
  display: inline-block; padding: 6px 16px; border-radius: 50px;
  background: rgba(230,57,70,0.08); border: 1px solid rgba(230,57,70,0.2);
  color: var(--text-secondary); font-size: 0.82rem; font-weight: 500;
  transition: var(--transition); cursor: default;
}
.cloud-tag:hover {
  background: rgba(230,57,70,0.18); color: var(--primary);
  border-color: var(--primary);
}

/* === Video Description & Tags === */
.video-desc {
  color: var(--text-secondary); font-size: 0.85rem;
  line-height: 1.6; margin-bottom: 10px;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.video-tags-inline {
  display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px;
}
.video-tags-inline span {
  display: inline-block; padding: 3px 10px; border-radius: 4px;
  background: rgba(244,162,97,0.1); color: var(--accent);
  font-size: 0.72rem; font-weight: 600;
}
.video-author {
  display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px;
  font-size: 0.75rem; color: var(--text-muted);
  padding-top: 8px; border-top: 1px solid var(--border-color);
}
.video-author span { display: inline-flex; align-items: center; gap: 3px; }

/* === Video Player Overlay === */
.video-thumb .video-player {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0; display: none;
}
.video-thumb .video-poster {
  position: relative; z-index: 1;
  width: 100%; height: 100%; object-fit: cover;
}
.video-thumb .video-play-btn { z-index: 2; }
.video-thumb .video-duration { z-index: 3; }
.video-thumb .video-tag { z-index: 3; }

/* === Content Policy Box === */
.content-policy-box {
  background: var(--bg-dark); border: 1px solid rgba(76,175,80,0.3);
  border-radius: var(--radius); padding: 32px; text-align: center;
  max-width: 800px; margin: 0 auto;
}
.content-policy-box h3 {
  font-size: 1.15rem; font-weight: 700; margin-bottom: 14px;
  color: #4CAF50;
}
.content-policy-box p {
  color: var(--text-secondary); font-size: 0.92rem; line-height: 1.8;
}

/* === Lazy Load === */
img[data-src] { opacity: 0; transition: opacity 0.5s ease; }
img[data-src].loaded { opacity: 1; }

/* === Responsive === */
@media (max-width: 1024px) {
  .hero-content h1 { font-size: 2.4rem; }
  .section-header h2 { font-size: 2rem; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}
@media (max-width: 768px) {
  .main-nav { 
    display: none; position: fixed; top: 70px; left: 0; right: 0;
    background: var(--bg-dark); flex-direction: column; padding: 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 20px; width: 100%; }
  .mobile-toggle { display: block; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-content p { font-size: 1rem; }
  .hero-stats { gap: 24px; }
  .hero-stat .num { font-size: 1.6rem; }
  .section { padding: 50px 0; }
  .section-header h2 { font-size: 1.6rem; }
  .video-grid { grid-template-columns: 1fr; }
  .short-video-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .page-header { padding: 80px 0 40px; }
  .page-header h1 { font-size: 1.8rem; }
}
@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.5rem; }
  .hero-btns { flex-direction: column; align-items: center; }
  .short-video-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .footer-grid { grid-template-columns: 1fr; }
  .brand-wall-item { width: 110px; height: 55px; font-size: 0.78rem; }
}

/* === Utility === */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }
.hidden { display: none; }