/* 海角视频 - 主样式文件 | c5xabk.cn */
:root {
  --primary: #0a3d7c;
  --secondary: #e84c3d;
  --accent: #f5a623;
  --bg-dark: #0d1117;
  --bg-card: #161b22;
  --bg-light: #f8f9fa;
  --text-main: #24292f;
  --text-light: #6e7781;
  --text-white: #ffffff;
  --border: #d0d7de;
  --shadow: 0 4px 20px rgba(0,0,0,0.12);
  --radius: 10px;
  --transition: 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--text-main);
  background: #fff;
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--secondary); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }

/* ===== HEADER ===== */
.site-header {
  background: var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  max-width: 1280px;
  margin: 0 auto;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 1px;
}

.site-logo img {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: contain;
  background: #fff;
}

.logo-text span { color: var(--accent); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-login, .btn-register {
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}

.btn-login {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.5);
}

.btn-login:hover { background: rgba(255,255,255,0.1); }

.btn-register {
  background: var(--secondary);
  color: #fff;
}

.btn-register:hover { background: #c0392b; }

/* ===== NAV ===== */
.main-nav {
  background: rgba(0,0,0,0.2);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-inner::-webkit-scrollbar { display: none; }

.nav-inner a {
  color: rgba(255,255,255,0.85);
  padding: 10px 16px;
  font-size: 14px;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.nav-inner a:hover,
.nav-inner a.active {
  color: #fff;
  border-bottom-color: var(--accent);
}

/* ===== SEARCH BAR ===== */
.search-bar-wrap {
  background: #f0f4f8;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
}

.search-bar-inner {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  gap: 0;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.search-bar-inner input {
  flex: 1;
  padding: 10px 20px;
  border: none;
  outline: none;
  font-size: 15px;
  background: #fff;
}

.search-bar-inner button {
  padding: 10px 24px;
  background: var(--secondary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  transition: background var(--transition);
}

.search-bar-inner button:hover { background: #c0392b; }

/* ===== HERO BANNER ===== */
.hero-banner {
  position: relative;
  height: 480px;
  overflow: hidden;
  background: var(--bg-dark);
}

.hero-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,61,124,0.85) 0%, rgba(232,76,61,0.4) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.hero-overlay h1 {
  font-size: 2.8rem;
  color: #fff;
  font-weight: 800;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-overlay p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.9);
  max-width: 600px;
  margin-bottom: 28px;
}

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

.btn-primary {
  padding: 12px 32px;
  background: var(--secondary);
  color: #fff;
  border-radius: 24px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover { background: #c0392b; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(232,76,61,0.4); color: #fff; }

.btn-outline {
  padding: 12px 32px;
  background: transparent;
  color: #fff;
  border-radius: 24px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid rgba(255,255,255,0.7);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-outline:hover { background: rgba(255,255,255,0.15); color: #fff; }

/* ===== MAIN CONTAINER ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== SECTION ===== */
.section { padding: 56px 0; }
.section-alt { background: var(--bg-light); }
.section-dark { background: var(--bg-dark); color: #fff; }

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-header h2 {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--secondary);
  margin: 8px auto 0;
  border-radius: 2px;
}

.section-dark .section-header h2 { color: #fff; }

.section-header p {
  color: var(--text-light);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto;
}

.section-dark .section-header p { color: rgba(255,255,255,0.7); }

/* ===== VIDEO CARDS ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.2);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #111;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img { transform: scale(1.06); }

.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity var(--transition);
}

.video-card:hover .play-btn { opacity: 1; }

.play-btn svg {
  width: 56px;
  height: 56px;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.5));
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 4px;
}

.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--secondary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.video-info {
  padding: 14px;
}

.video-title {
  font-size: 14px;
  font-weight: 600;
  color: #e6edf3;
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: #8b949e;
}

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

/* ===== IMAGE CARDS ===== */
.img-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.img-card {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  aspect-ratio: 3/4;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform var(--transition);
}

.img-card:hover { transform: scale(1.03); }

.img-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 14px 14px;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: #fff;
  font-size: 13px;
  font-weight: 500;
}

/* ===== EXPERT CARDS ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.expert-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}

.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--primary);
}

.expert-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.expert-title {
  font-size: 13px;
  color: var(--secondary);
  margin-bottom: 10px;
  font-weight: 500;
}

.expert-desc {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.expert-btns { display: flex; gap: 8px; justify-content: center; }

.btn-sm {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-sm-primary { background: var(--primary); color: #fff; }
.btn-sm-primary:hover { background: #0d4f9e; color: #fff; }
.btn-sm-outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-sm-outline:hover { background: var(--primary); color: #fff; }

/* ===== STATS BAR ===== */
.stats-bar {
  background: var(--primary);
  padding: 24px 0;
  color: #fff;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-item p {
  font-size: 13px;
  color: rgba(255,255,255,0.8);
  margin-top: 4px;
}

/* ===== TABS ===== */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 8px 20px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-main);
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition);
}

.tab-btn.active, .tab-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #fff;
  transition: background var(--transition);
}

.faq-question:hover { background: var(--bg-light); }

.faq-question.open { background: var(--primary); color: #fff; }

.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}

.faq-answer.open { max-height: 300px; padding: 16px 20px; }

.faq-icon { font-size: 18px; transition: transform var(--transition); }
.faq-question.open .faq-icon { transform: rotate(45deg); }

/* ===== REVIEWS ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
}

.review-stars { color: var(--accent); font-size: 16px; margin-bottom: 10px; }

.review-text {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.7;
  margin-bottom: 14px;
}

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

.review-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
}

.review-name { font-size: 14px; font-weight: 600; }
.review-date { font-size: 12px; color: var(--text-light); }

/* ===== PARTNERS ===== */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}

.partner-item {
  padding: 12px 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  transition: all var(--transition);
}

.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 4px 12px rgba(10,61,124,0.1);
}

/* ===== HOW TO JOIN ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.step-item {
  text-align: center;
  padding: 24px 16px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: relative;
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
}

.step-title { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--text-light); }

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3 { font-size: 1.4rem; color: var(--primary); margin-bottom: 20px; }

.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
  align-items: flex-start;
}

.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.contact-label { font-size: 12px; color: var(--text-light); }
.contact-value { font-size: 14px; font-weight: 500; }

.qr-group { display: flex; gap: 24px; flex-wrap: wrap; }

.qr-item { text-align: center; }
.qr-item img { width: 120px; height: 120px; border: 1px solid var(--border); border-radius: 8px; }
.qr-item p { font-size: 12px; color: var(--text-light); margin-top: 6px; }

/* ===== SOCIAL SHARE ===== */
.social-share {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 24px 0;
}

.share-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; }
.share-bilibili { background: #00a1d6; color: #fff; }

.share-btn:hover { opacity: 0.85; transform: translateY(-2px); }

/* ===== BREADCRUMB ===== */
.breadcrumb {
  padding: 12px 0;
  font-size: 13px;
  color: var(--text-light);
}

.breadcrumb a { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== PAGE HERO ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, #1a5fa8 100%);
  padding: 48px 0;
  color: #fff;
  text-align: center;
}

.page-hero h1 { font-size: 2rem; font-weight: 700; margin-bottom: 10px; }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.85); max-width: 560px; margin: 0 auto; }

/* ===== FOOTER ===== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.75);
  padding: 48px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-brand .site-logo { margin-bottom: 14px; }

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  margin-bottom: 16px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-col ul li { margin-bottom: 8px; }

.footer-col ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

.footer-col ul li a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: rgba(255,255,255,0.45);
}

.footer-bottom a { color: rgba(255,255,255,0.45); }
.footer-bottom a:hover { color: var(--accent); }

/* ===== TAGS ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

.tag {
  padding: 4px 12px;
  background: rgba(10,61,124,0.08);
  color: var(--primary);
  border-radius: 12px;
  font-size: 12px;
  border: 1px solid rgba(10,61,124,0.15);
  transition: all var(--transition);
}

.tag:hover { background: var(--primary); color: #fff; }

/* ===== AI SECTION ===== */
.ai-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ai-card {
  background: linear-gradient(135deg, #0a3d7c 0%, #1a5fa8 100%);
  border-radius: var(--radius);
  padding: 28px 22px;
  color: #fff;
  text-align: center;
  transition: transform var(--transition);
}

.ai-card:hover { transform: translateY(-4px); }

.ai-icon { font-size: 2.5rem; margin-bottom: 14px; }
.ai-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.ai-card p { font-size: 13px; color: rgba(255,255,255,0.8); line-height: 1.7; }

/* ===== LIVE SECTION ===== */
.live-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.live-card {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  aspect-ratio: 3/4;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.live-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.live-card:hover img { transform: scale(1.05); }

.live-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--secondary);
  color: #fff;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 700;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.live-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 12px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: #fff;
}

.live-name { font-size: 13px; font-weight: 600; margin-bottom: 2px; }
.live-viewers { font-size: 11px; color: rgba(255,255,255,0.75); }

/* ===== NOTICE BAR ===== */
.notice-bar {
  background: var(--accent);
  color: #fff;
  padding: 8px 24px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
}

.notice-label {
  background: rgba(0,0,0,0.2);
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.notice-scroll {
  overflow: hidden;
  flex: 1;
}

.notice-scroll-inner {
  display: inline-flex;
  gap: 60px;
  animation: scrollNotice 30s linear infinite;
  white-space: nowrap;
}

@keyframes scrollNotice {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ===== PAGINATION ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.page-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-main);
}

.page-btn.active, .page-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===== INNER PAGE CONTENT ===== */
.inner-content {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.inner-content h2 {
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--bg-light);
}

.inner-content p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-main);
  margin-bottom: 14px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-features { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .hero-overlay h1 { font-size: 1.8rem; }
  .hero-banner { height: 320px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .img-grid { grid-template-columns: repeat(2, 1fr); }
  .live-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .ai-features { grid-template-columns: 1fr; }
  .header-top { padding: 10px 16px; }
  .container { padding: 0 16px; }
  .section { padding: 36px 0; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .img-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .hero-overlay h1 { font-size: 1.5rem; }
  .hero-btns { flex-direction: column; align-items: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== UTILITY ===== */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.hidden { display: none; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.w-full { width: 100%; }

/* ===== LAZY LOAD ===== */
img[data-src] { opacity: 0; transition: opacity 0.4s; }
img.loaded { opacity: 1; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--secondary); }