/* ========================================
   海角视频 - 主样式文件
   Brand: 海角 | Domain: hnjtql.cn
   Version: 1.0 | 2026
======================================== */

/* CSS Variables - 原创配色方案 */
:root {
  --primary: #0a4d8c;
  --primary-dark: #063566;
  --primary-light: #1a6db5;
  --accent: #e85d26;
  --accent-light: #f47c4a;
  --accent-dark: #c44a18;
  --bg-dark: #0d1117;
  --bg-card: #161b22;
  --bg-section: #0f1923;
  --text-primary: #e8edf2;
  --text-secondary: #8b9ab0;
  --text-muted: #5a6a7e;
  --border: #21303f;
  --gradient-hero: linear-gradient(135deg, #0a4d8c 0%, #063566 40%, #0d1117 100%);
  --gradient-accent: linear-gradient(135deg, #e85d26, #f47c4a);
  --gradient-card: linear-gradient(180deg, rgba(22,27,34,0.95) 0%, rgba(13,17,23,0.98) 100%);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 32px rgba(232,93,38,0.25);
  --radius: 12px;
  --radius-sm: 6px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::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;
  background: var(--bg-dark);
  color: var(--text-primary);
  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 & NAVIGATION
======================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,17,23,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}
.site-logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 8px;
}
.logo-text span { color: var(--accent); }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.07);
}
.nav-cta {
  background: var(--gradient-accent) !important;
  color: #fff !important;
  padding: 8px 18px !important;
  border-radius: 20px !important;
  font-weight: 600 !important;
}
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* Search Bar */
.search-bar-wrap {
  background: rgba(10,77,140,0.15);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.search-form {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 6px 16px;
  flex: 1;
  max-width: 600px;
  gap: 8px;
}
.search-form input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
}
.search-form input::placeholder { color: var(--text-muted); }
.search-btn {
  background: var(--gradient-accent);
  border: none;
  border-radius: 20px;
  color: #fff;
  padding: 6px 20px;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  transition: var(--transition);
}
.search-btn:hover { opacity: 0.9; }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tag {
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { color: var(--accent); border-color: var(--accent); }

/* Breadcrumb */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 20px;
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { opacity: 0.5; }

/* ========================================
   HERO SECTION
======================================== */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gradient-hero);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/images/generated/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.25;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(6,53,102,0.9) 0%, rgba(13,17,23,0.6) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-text h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  color: #fff;
}
.hero-text h1 em { color: var(--accent); font-style: normal; }
.hero-text p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  padding: 12px 28px;
  border-radius: 24px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,93,38,0.4); }
.btn-secondary {
  background: rgba(255,255,255,0.1);
  color: #fff;
  padding: 12px 28px;
  border-radius: 24px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid rgba(255,255,255,0.2);
  transition: var(--transition);
}
.btn-secondary:hover { background: rgba(255,255,255,0.18); }
.hero-stats { display: flex; gap: 28px; margin-top: 32px; }
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--accent);
  display: block;
}
.hero-stat .label { font-size: 0.78rem; color: rgba(255,255,255,0.6); }

.hero-visual { position: relative; }
.hero-video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.hero-video-card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.hero-video-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-lg);
}
.play-btn-large {
  width: 64px;
  height: 64px;
  background: rgba(232,93,38,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}
.play-btn-large:hover { transform: scale(1.1); background: var(--accent); }
.play-btn-large svg { width: 28px; height: 28px; fill: #fff; margin-left: 4px; }

/* ========================================
   SECTION COMMON
======================================== */
.section { padding: 60px 0; }
.section-alt { background: var(--bg-section); }
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section-header { text-align: center; margin-bottom: 40px; }
.section-tag {
  display: inline-block;
  background: rgba(232,93,38,0.15);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(232,93,38,0.3);
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.section-title em { color: var(--accent); font-style: normal; }
.section-desc { color: var(--text-secondary); font-size: 0.95rem; max-width: 600px; margin: 0 auto; }
.section-more {
  text-align: center;
  margin-top: 36px;
}
.btn-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: var(--transition);
}
.btn-more:hover { border-color: var(--accent); color: var(--accent); }

/* ========================================
   VIDEO CARDS
======================================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-grid-4 { grid-template-columns: repeat(4, 1fr); }
.video-grid-3 { grid-template-columns: repeat(3, 1fr); }
.video-grid-2 { grid-template-columns: repeat(2, 1fr); }

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232,93,38,0.3);
}
.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); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 48px;
  height: 48px;
  background: rgba(232,93,38,0.9);
  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 svg { width: 20px; height: 20px; fill: #fff; margin-left: 3px; }
.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  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;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-author { display: flex; align-items: center; gap: 6px; }
.video-author img {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
}
.video-stats { display: flex; gap: 10px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ========================================
   CATEGORY TABS
======================================== */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.tab-btn {
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}
.tab-btn:hover, .tab-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ========================================
   LIVE SECTION
======================================== */
.live-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.live-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.live-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.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: #e53935;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.live-dot {
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 50%;
  animation: pulse 1.2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.live-viewers {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
}
.live-info { padding: 12px; }
.live-name { font-size: 0.88rem; font-weight: 600; margin-bottom: 4px; }
.live-desc { font-size: 0.75rem; color: var(--text-muted); }

/* ========================================
   EXPERTS SECTION
======================================== */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--accent);
}
.expert-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: 0.8rem; color: var(--accent); margin-bottom: 10px; }
.expert-desc { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.6; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.expert-tag {
  font-size: 0.72rem;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-muted);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 0.78rem;
  font-weight: 600;
  transition: var(--transition);
}
.btn-outline {
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-filled {
  background: var(--gradient-accent);
  color: #fff;
}
.btn-filled:hover { opacity: 0.9; }

/* ========================================
   PARTNERS LOGO WALL
======================================== */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
  min-height: 70px;
}
.partner-item:hover { border-color: var(--accent); color: var(--accent); }

/* ========================================
   FAQ SECTION
======================================== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 18px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--accent);
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 20px 18px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.faq-item.open .faq-answer { display: block; }

/* ========================================
   REVIEWS SECTION
======================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(232,93,38,0.3); }
.review-stars { color: #f5a623; font-size: 1rem; margin-bottom: 12px; }
.review-text { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 0.88rem; font-weight: 600; }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ========================================
   CONTACT SECTION
======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 { font-size: 1.3rem; margin-bottom: 20px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(10,77,140,0.2);
  border: 1px solid rgba(10,77,140,0.3);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
}
.contact-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.9rem; font-weight: 500; }

.qr-grid { display: flex; gap: 20px; }
.qr-item { text-align: center; }
.qr-item img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #fff;
  padding: 4px;
}
.qr-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 8px; }

/* ========================================
   SOCIAL SHARE
======================================== */
.share-bar {
  background: var(--bg-section);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.share-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 0.85rem; color: var(--text-muted); }
.share-btns { display: flex; gap: 8px; }
.share-btn {
  padding: 6px 16px;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: inherit;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* ========================================
   FOOTER
======================================== */
.site-footer {
  background: #080d12;
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .site-logo { margin-bottom: 14px; }
.footer-brand p { font-size: 0.83rem; color: var(--text-muted); line-height: 1.8; }
.footer-col h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 14px; color: var(--text-primary); }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.83rem; color: var(--text-muted); }
.footer-col ul li a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }
.update-time { font-size: 0.78rem; color: var(--text-muted); }

/* ========================================
   PAGE HERO (Inner Pages)
======================================== */
.page-hero {
  background: var(--gradient-hero);
  padding: 60px 0 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(232,93,38,0.1) 0%, transparent 70%);
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 12px;
  position: relative;
}
.page-hero p {
  font-size: 1rem;
  color: rgba(255,255,255,0.75);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* ========================================
   HOW-TO GUIDE
======================================== */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
}
.step-num {
  width: 48px;
  height: 48px;
  background: var(--gradient-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 16px;
}
.step-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.7; }

/* ========================================
   AI FEATURES
======================================== */
.ai-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}
.ai-feature-card:hover { transform: translateY(-4px); border-color: rgba(10,77,140,0.5); }
.ai-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}
.ai-feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.ai-feature-card p { font-size: 0.83rem; color: var(--text-secondary); line-height: 1.7; }

/* ========================================
   STATS BAR
======================================== */
.stats-bar {
  background: var(--gradient-hero);
  padding: 40px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item .stat-num {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent);
  display: block;
}
.stat-item .stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.7); margin-top: 4px; }

/* ========================================
   TAGS CLOUD
======================================== */
.tags-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  padding: 5px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.tag-item:hover { border-color: var(--accent); color: var(--accent); }

/* ========================================
   MOBILE RESPONSIVE
======================================== */
@media (max-width: 1024px) {
  .video-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(13,17,23,0.98); border-bottom: 1px solid var(--border); padding: 12px; gap: 4px; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 10px 16px; border-radius: var(--radius-sm); }
  .hamburger { display: flex; }
  .hero-content { grid-template-columns: 1fr; gap: 32px; }
  .hero-visual { display: none; }
  .video-grid-4, .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .video-grid-2 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .ai-features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .experts-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .video-grid-4, .video-grid-3, .video-grid-2 { grid-template-columns: 1fr; }
  .hero-stats { gap: 16px; }
  .hero-stat .num { font-size: 1.4rem; }
  .experts-grid { grid-template-columns: 1fr; }
  .live-grid { grid-template-columns: repeat(2, 1fr); }
  .search-tags { display: none; }
}

/* ========================================
   UTILITIES
======================================== */
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.hidden { display: none; }
.lazy { opacity: 0; transition: opacity 0.4s ease; }
.lazy.loaded { opacity: 1; }

/* Loading skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--border) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }