/* ===================================================
   捷克街头传媒 - 主样式文件
   Brand: 捷克街头 | Domain: zh356d.cn
   =================================================== */

/* CSS Variables */
:root {
  --primary: #0d3461;
  --primary-light: #1a5276;
  --accent: #d4af37;
  --accent-light: #f0d060;
  --bg-dark: #0a1628;
  --bg-card: #112240;
  --bg-light: #f8f9fa;
  --text-main: #1a1a2e;
  --text-muted: #6c757d;
  --text-white: #ffffff;
  --text-light: #e8eaf0;
  --border: #dee2e6;
  --shadow: 0 4px 20px rgba(13,52,97,0.12);
  --shadow-hover: 0 8px 32px rgba(13,52,97,0.22);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: all 0.3s ease;
  --font-main: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===== HEADER ===== */
.site-header {
  background: var(--bg-dark);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.site-logo img {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: contain;
  background: var(--accent);
  padding: 2px;
}
.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 2px;
}
.logo-sub {
  font-size: 0.7rem;
  color: var(--text-light);
  opacity: 0.7;
  display: block;
  letter-spacing: 1px;
}

/* Navigation */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--text-light);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  transition: var(--transition);
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--accent);
  background: rgba(212,175,55,0.1);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-light);
  border-radius: 2px;
  transition: var(--transition);
}

/* Search Bar */
.search-bar-wrap {
  background: var(--primary);
  padding: 12px 20px;
  border-bottom: 1px solid rgba(212,175,55,0.2);
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.search-form {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(212,175,55,0.3);
  border-radius: 24px;
  overflow: hidden;
  flex: 1;
  max-width: 600px;
}
.search-form input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 8px 16px;
  color: var(--text-white);
  font-size: 0.9rem;
  font-family: var(--font-main);
}
.search-form input::placeholder { color: rgba(255,255,255,0.5); }
.search-form button {
  background: var(--accent);
  border: none;
  padding: 8px 20px;
  color: var(--primary);
  font-weight: 700;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition);
}
.search-form button:hover { background: var(--accent-light); }
.search-hot {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.search-hot span { color: rgba(255,255,255,0.6); font-size: 0.8rem; }
.search-hot a {
  color: var(--accent);
  font-size: 0.8rem;
  padding: 2px 8px;
  border: 1px solid rgba(212,175,55,0.3);
  border-radius: 12px;
}
.search-hot a:hover { background: rgba(212,175,55,0.15); }

/* ===== HERO BANNER ===== */
.hero-banner {
  position: relative;
  height: 520px;
  overflow: hidden;
  background: var(--bg-dark);
}
.hero-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,52,97,0.85) 0%, rgba(10,22,40,0.6) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-content {
  text-align: center;
  color: var(--text-white);
  padding: 0 20px;
}
.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.5);
}
.hero-content h1 .brand { color: var(--accent); }
.hero-content p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  opacity: 0.9;
  margin-bottom: 28px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: var(--accent);
  color: var(--primary);
  padding: 12px 32px;
  border-radius: 28px;
  font-weight: 700;
  font-size: 1rem;
  transition: var(--transition);
  border: 2px solid var(--accent);
}
.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212,175,55,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--text-white);
  padding: 12px 32px;
  border-radius: 28px;
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid rgba(255,255,255,0.6);
  transition: var(--transition);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ===== SECTION COMMON ===== */
.section { padding: 64px 20px; }
.section-dark { background: var(--bg-dark); color: var(--text-white); }
.section-gray { background: #f0f3f8; }
.container { max-width: 1280px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block;
  background: rgba(212,175,55,0.15);
  color: var(--accent);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 12px;
  border: 1px solid rgba(212,175,55,0.3);
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title .brand { color: var(--accent); }
.section-desc {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto;
}
.section-dark .section-desc { color: rgba(255,255,255,0.65); }

/* ===== VIDEO CARDS ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--bg-dark);
}
.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(0,0,0,0.35);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(212,175,55,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border-left: 20px solid var(--primary);
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}
.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--accent);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.72rem;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
  color: var(--text-main);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-stats {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ===== CATEGORY TABS ===== */
.cat-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.cat-tab {
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid var(--border);
  background: #fff;
  color: var(--text-muted);
  transition: var(--transition);
}
.cat-tab.active,
.cat-tab:hover {
  background: var(--primary);
  color: var(--accent);
  border-color: var(--primary);
}

/* ===== EXPERTS ===== */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid rgba(212,175,55,0.15);
  transition: var(--transition);
}
.expert-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--text-white);
  font-weight: 700;
}
.expert-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 4px;
}
.expert-role {
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 10px;
}
.expert-desc {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
  margin-bottom: 16px;
}
.expert-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 16px;
}
.award-tag {
  background: rgba(212,175,55,0.15);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.72rem;
  border: 1px solid rgba(212,175,55,0.2);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
}
.btn-gold {
  background: var(--accent);
  color: var(--primary);
}
.btn-gold:hover { background: var(--accent-light); }
.btn-ghost {
  background: transparent;
  color: var(--text-light);
  border: 1px solid rgba(255,255,255,0.3);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ===== STATS BAR ===== */
.stats-bar {
  background: var(--primary);
  padding: 28px 20px;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
  text-align: center;
}
.stat-item { color: var(--text-white); }
.stat-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent);
  display: block;
  line-height: 1.2;
}
.stat-label { font-size: 0.85rem; opacity: 0.8; margin-top: 4px; }

/* ===== PARTNER LOGOS ===== */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow);
}

/* ===== HOW TO JOIN ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.step-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
}
.step-num {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  margin: 0 auto 14px;
}
.step-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}
.step-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}
.faq-q {
  padding: 16px 20px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-main);
  transition: var(--transition);
}
.faq-q:hover { color: var(--primary); }
.faq-q .icon {
  font-size: 1.2rem;
  transition: var(--transition);
  color: var(--accent);
  font-style: normal;
}
.faq-item.open .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 16px; }

/* ===== REVIEWS ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--accent);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.review-stars { color: var(--accent); font-size: 1rem; margin-bottom: 10px; }
.review-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 14px;
}
.reviewer {
  display: flex;
  align-items: center;
  gap: 10px;
}
.reviewer-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.reviewer-name { font-weight: 700; font-size: 0.88rem; }
.reviewer-date { font-size: 0.75rem; color: var(--text-muted); }

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--text-white);
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  color: rgba(255,255,255,0.8);
  font-size: 0.92rem;
}
.contact-icon {
  width: 36px;
  height: 36px;
  background: rgba(212,175,55,0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.qr-codes { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  border: 2px solid rgba(212,175,55,0.3);
}
.qr-label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  margin-top: 6px;
}

/* ===== SHARE BAR ===== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 0.9rem; color: var(--text-muted); }
.share-btn {
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--border);
}
.share-wechat { background: #07c160; color: #fff; border-color: #07c160; }
.share-weibo { background: #e6162d; color: #fff; border-color: #e6162d; }
.share-douyin { background: #010101; color: #fff; border-color: #333; }
.share-bilibili { background: #00a1d6; color: #fff; border-color: #00a1d6; }
.share-btn:hover { opacity: 0.85; transform: translateY(-2px); }

/* ===== FOOTER ===== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 48px 20px 24px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-text { font-size: 1.4rem; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: 0.85rem; line-height: 1.8; margin-bottom: 16px; }
.footer-col h4 {
  color: var(--text-white);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(212,175,55,0.2);
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
}
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: rgba(255,255,255,0.5); }
.footer-links a:hover { color: var(--accent); }

/* ===== BREADCRUMB ===== */
.breadcrumb {
  background: #fff;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--primary); }
.breadcrumb-inner a:hover { color: var(--accent); }
.breadcrumb-inner .sep { color: var(--border); }
.breadcrumb-inner .current { color: var(--text-main); font-weight: 600; }

/* ===== PAGE HERO ===== */
.page-hero {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--primary) 100%);
  padding: 60px 20px;
  text-align: center;
  color: var(--text-white);
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 12px;
}
.page-hero p {
  font-size: 1rem;
  opacity: 0.8;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== INNER PAGE CONTENT ===== */
.inner-content { padding: 48px 20px; }
.content-intro {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--accent);
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text-muted);
}
.content-intro strong { color: var(--primary); }

/* ===== LIVE SECTION ===== */
.live-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.live-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid rgba(212,175,55,0.1);
}
.live-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}
.live-thumb {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
}
.live-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.live-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: #e74c3c;
  color: #fff;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.live-viewers {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.72rem;
}
.live-info { padding: 14px 16px; }
.live-name { font-size: 0.95rem; font-weight: 700; color: var(--text-white); margin-bottom: 4px; }
.live-tag { font-size: 0.78rem; color: var(--accent); }

/* ===== AI SECTION ===== */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.ai-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-top: 3px solid var(--accent);
}
.ai-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.ai-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.ai-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--text-main); }
.ai-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .header-inner { height: 60px; }
  .main-nav { display: none; position: absolute; top: 60px; left: 0; right: 0; background: var(--bg-dark); flex-direction: column; padding: 16px; gap: 4px; border-top: 1px solid rgba(255,255,255,0.1); }
  .main-nav.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero-banner { height: 360px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .search-hot { display: none; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}
@media (max-width: 480px) {
  .section { padding: 40px 16px; }
  .video-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-btns { flex-direction: column; align-items: center; }
}

/* ===== UTILITIES ===== */
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }
.hidden { display: none; }
.show-more {
  display: block;
  text-align: center;
  margin-top: 32px;
}
.show-more a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 28px;
  border: 2px solid var(--primary);
  border-radius: 24px;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
}
.show-more a:hover {
  background: var(--primary);
  color: var(--accent);
}
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.tag {
  background: rgba(13,52,97,0.08);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.78rem;
}