/* =====================================================
   抖阴 影视传媒 - 主样式表
   Brand: 抖阴 | Domain: yc231.cn
   ===================================================== */

/* ---- CSS变量 / 设计系统 ---- */
:root {
  --primary: #0d1b2a;
  --secondary: #1b2e45;
  --accent: #ff4757;
  --accent2: #f4a261;
  --highlight: #ff6b9d;
  --text-main: #e8edf2;
  --text-muted: #8fa3b8;
  --text-dark: #1a1a2e;
  --card-bg: #162032;
  --card-border: rgba(46,196,182,0.18);
  --gradient-hero: linear-gradient(135deg, #0d1b2a 0%, #1b2e45 60%, #0a1628 100%);
  --gradient-accent: linear-gradient(90deg, #e63946, #f4a261);
  --gradient-card: linear-gradient(145deg, #162032, #1b2e45);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-hover: 0 16px 48px rgba(230,57,70,0.22);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
}

/* ---- 全局重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--primary);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--highlight); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* =====================================================
   HEADER / 顶部导航
   ===================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(13,27,42,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(46,196,182,0.15);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.5); }

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 68px;
  gap: 24px;
}

/* Logo区域 */
.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 8px;
}
.logo-text {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 2px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-sub {
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  display: block;
  margin-top: -4px;
}

/* 主导航 */
.main-nav { flex: 1; }
.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  background: rgba(230,57,70,0.15);
  color: var(--accent);
}

/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(46,196,182,0.2);
  border-radius: 24px;
  overflow: hidden;
  flex-shrink: 0;
}
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-main);
  padding: 8px 16px;
  font-size: 0.85rem;
  width: 180px;
  font-family: var(--font-main);
}
.header-search input::placeholder { color: var(--text-muted); }
.header-search button {
  background: var(--accent);
  color: #fff;
  padding: 8px 14px;
  font-size: 0.85rem;
  transition: background var(--transition);
}
.header-search button:hover { background: #c1121f; }

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}

/* 搜索栏（导航下方） */
.search-bar-below {
  background: rgba(22,32,50,0.98);
  border-bottom: 1px solid rgba(46,196,182,0.1);
  padding: 10px 0;
}
.search-bar-below .search-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-bar-below .search-big {
  flex: 1;
  display: flex;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(46,196,182,0.25);
  border-radius: 30px;
  overflow: hidden;
}
.search-bar-below .search-big input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-main);
  padding: 10px 20px;
  font-size: 0.95rem;
  font-family: var(--font-main);
}
.search-bar-below .search-big input::placeholder { color: var(--text-muted); }
.search-bar-below .search-big button {
  background: var(--gradient-accent);
  color: #fff;
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 0 30px 30px 0;
  transition: opacity var(--transition);
}
.search-bar-below .search-big button:hover { opacity: 0.85; }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tags span {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  padding: 4px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--transition);
}
.search-tags span:hover { color: var(--highlight); background: rgba(46,196,182,0.1); }

/* =====================================================
   HERO / 首屏横幅
   ===================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 120px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  z-index: 1;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(13,27,42,0.92) 40%, rgba(13,27,42,0.3) 100%);
  z-index: 2;
}
.hero-content {
  position: relative;
  z-index: 3;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(230,57,70,0.15);
  border: 1px solid rgba(230,57,70,0.35);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.hero-badge::before { content: '●'; font-size: 0.6rem; animation: blink 1.5s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero h1 .brand { background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 36px;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 900;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.hero-stat .label { font-size: 0.78rem; color: var(--text-muted); }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  font-family: var(--font-main);
}
.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(230,57,70,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(230,57,70,0.55); color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1.5px solid rgba(255,255,255,0.25);
}
.btn-outline:hover { border-color: var(--highlight); color: var(--highlight); transform: translateY(-2px); }

/* Hero右侧视频卡片展示 */
.hero-video-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.hero-video-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16/10;
  cursor: pointer;
  background: var(--card-bg);
}
.hero-video-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.hero-video-card:hover img { transform: scale(1.08); }
.hero-video-card .play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.hero-video-card:hover .play-overlay { opacity: 1; }
.play-btn-icon {
  width: 48px;
  height: 48px;
  background: rgba(230,57,70,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
  transform: scale(0.8);
  transition: transform var(--transition);
}
.hero-video-card:hover .play-btn-icon { transform: scale(1); }
.hero-video-card .card-label {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  padding: 20px 12px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #fff;
}

/* =====================================================
   通用区块样式
   ===================================================== */
.section {
  padding: 80px 0;
}
.section-alt { background: var(--secondary); }
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-tag {
  display: inline-block;
  background: rgba(230,57,70,0.12);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 14px;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}
.section-title .accent { color: var(--accent); }
.section-title .highlight { color: var(--highlight); }
.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* =====================================================
   视频卡片 / VIDEO CARDS
   ===================================================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(230,57,70,0.35);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0a1628;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-thumb .play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .play-overlay { opacity: 1; }
.video-play-btn {
  width: 56px;
  height: 56px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
  box-shadow: 0 4px 20px rgba(230,57,70,0.5);
  transform: scale(0.7);
  transition: transform var(--transition);
}
.video-card:hover .video-play-btn { transform: scale(1); }
.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 8px; left: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 0.92rem;
  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: 0.75rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-stats {
  display: flex;
  gap: 14px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.75rem;
  color: var(--text-muted);
}
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* =====================================================
   功能模块卡片
   ===================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
  transition: all var(--transition);
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(46,196,182,0.35);
}
.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(230,57,70,0.12);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin: 0 auto 16px;
  transition: background var(--transition);
}
.feature-card:hover .feature-icon { background: rgba(230,57,70,0.22); }
.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* =====================================================
   专家展示
   ===================================================== */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.expert-photo {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
}
.expert-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.expert-card:hover .expert-photo img { transform: scale(1.05); }
.expert-badge {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
}
.expert-info { padding: 18px 18px 20px; }
.expert-name {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 4px;
}
.expert-role {
  font-size: 0.8rem;
  color: var(--highlight);
  font-weight: 600;
  margin-bottom: 10px;
}
.expert-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}
.expert-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}
.award-tag {
  font-size: 0.68rem;
  background: rgba(244,162,97,0.12);
  color: var(--accent2);
  padding: 3px 8px;
  border-radius: 8px;
  border: 1px solid rgba(244,162,97,0.2);
}
.expert-actions {
  display: flex;
  gap: 8px;
}
.btn-sm {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-sm-primary { background: var(--accent); color: #fff; }
.btn-sm-primary:hover { background: #c1121f; color: #fff; }
.btn-sm-outline { border: 1px solid rgba(255,255,255,0.2); color: var(--text-muted); }
.btn-sm-outline:hover { border-color: var(--highlight); color: var(--highlight); }

/* =====================================================
   用户评价
   ===================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.review-stars { color: var(--accent2); font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}
.review-text::before { content: '"'; color: var(--accent); font-size: 1.5rem; line-height: 0; vertical-align: -0.4em; margin-right: 4px; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #fff;
  font-weight: 700;
  flex-shrink: 0;
}
.review-name { font-size: 0.88rem; font-weight: 700; }
.review-meta { font-size: 0.72rem; color: var(--text-muted); }

/* =====================================================
   FAQ
   ===================================================== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: rgba(46,196,182,0.35); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  gap: 12px;
  user-select: none;
}
.faq-question .faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(230,57,70,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: rgba(230,57,70,0.25); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 22px 18px; }

/* =====================================================
   合作品牌Logo墙
   ===================================================== */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition);
  text-align: center;
  min-width: 120px;
}
.partner-item:hover { border-color: rgba(46,196,182,0.4); color: var(--highlight); transform: translateY(-3px); }

/* =====================================================
   社区功能区
   ===================================================== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.community-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px 18px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.community-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.community-card:hover::before { transform: scaleX(1); }
.community-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.community-icon { font-size: 2rem; margin-bottom: 12px; }
.community-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.community-card p { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; }
.community-num { font-size: 1.1rem; font-weight: 900; color: var(--accent); margin-top: 8px; }

/* =====================================================
   AI赋能区
   ===================================================== */
.ai-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.ai-feature-list { display: flex; flex-direction: column; gap: 16px; }
.ai-feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: all var(--transition);
}
.ai-feature-item:hover { border-color: rgba(46,196,182,0.35); transform: translateX(4px); }
.ai-feature-icon {
  width: 44px;
  height: 44px;
  background: rgba(46,196,182,0.12);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.ai-feature-item h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.ai-feature-item p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.6; }
.ai-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
}
.ai-visual img { width: 100%; height: 100%; object-fit: cover; }
.ai-visual-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(46,196,182,0.15), rgba(230,57,70,0.1));
}

/* =====================================================
   联系我们
   ===================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.contact-info-card h3 { font-size: 1.2rem; font-weight: 800; margin-bottom: 24px; }
.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 18px;
}
.contact-item-icon {
  width: 40px;
  height: 40px;
  background: rgba(230,57,70,0.12);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-item-label { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-item-value { font-size: 0.9rem; font-weight: 600; }
.qr-row {
  display: flex;
  gap: 20px;
  margin-top: 24px;
}
.qr-item { text-align: center; }
.qr-item img { width: 100px; height: 100px; border-radius: 8px; margin-bottom: 6px; }
.qr-item span { font-size: 0.72rem; color: var(--text-muted); display: block; }

/* =====================================================
   社交分享
   ===================================================== */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.share-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
  border: 1.5px solid transparent;
  font-family: var(--font-main);
}
.share-wechat { background: rgba(7,193,96,0.12); color: #07c160; border-color: rgba(7,193,96,0.25); }
.share-wechat:hover { background: #07c160; color: #fff; }
.share-weibo { background: rgba(230,57,70,0.12); color: var(--accent); border-color: rgba(230,57,70,0.25); }
.share-weibo:hover { background: var(--accent); color: #fff; }
.share-douyin { background: rgba(0,0,0,0.3); color: #fff; border-color: rgba(255,255,255,0.15); }
.share-douyin:hover { background: #000; color: #fff; }
.share-bilibili { background: rgba(0,161,214,0.12); color: #00a1d6; border-color: rgba(0,161,214,0.25); }
.share-bilibili:hover { background: #00a1d6; color: #fff; }

/* =====================================================
   FOOTER
   ===================================================== */
.site-footer {
  background: #080f1a;
  border-top: 1px solid rgba(46,196,182,0.1);
  padding: 60px 0 0;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .logo-wrap { margin-bottom: 16px; }
.footer-brand p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--highlight); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 24px;
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 0.78rem; color: var(--text-muted); }
.footer-bottom .update-time { color: var(--highlight); font-size: 0.78rem; }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 0.78rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--highlight); }

/* =====================================================
   面包屑
   ===================================================== */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--highlight); }
.breadcrumb span { margin: 0 8px; }

/* =====================================================
   页面顶部间距（固定导航补偿）
   ===================================================== */
.page-top { padding-top: 120px; }
.inner-hero {
  background: var(--gradient-hero);
  padding: 60px 0 50px;
  position: relative;
  overflow: hidden;
}
.inner-hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(230,57,70,0.12), transparent 70%);
  border-radius: 50%;
}
.inner-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 900; margin-bottom: 12px; }
.inner-hero p { font-size: 1rem; color: var(--text-muted); }

/* =====================================================
   响应式
   ===================================================== */
@media (max-width: 1024px) {
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero-video-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .ai-features { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: block;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: rgba(13,27,42,0.98);
    padding: 16px;
    border-bottom: 1px solid rgba(46,196,182,0.15);
  }
  .main-nav.open ul { flex-direction: column; gap: 4px; }
  .main-nav.open a { display: block; padding: 10px 16px; }
  .hamburger { display: flex; }
  .header-search { display: none; }
  .hero-video-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { gap: 20px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .experts-grid { grid-template-columns: 1fr 1fr; }
  .search-bar-below .search-inner { flex-direction: column; }
  .search-tags { display: none; }
}

@media (max-width: 480px) {
  .hero-video-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
  .hero-actions { flex-direction: column; }
  .btn { justify-content: center; }
  .community-grid { grid-template-columns: 1fr 1fr; }
}

/* =====================================================
   动画
   ===================================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.animate-fadeInUp { animation: fadeInUp 0.7s ease forwards; }
.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }

/* 懒加载占位 */
.lazy-placeholder {
  background: linear-gradient(90deg, var(--card-bg) 25%, var(--secondary) 50%, var(--card-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 视频模态框 */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.92);
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  position: relative;
  width: 90%;
  max-width: 900px;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
}
.video-modal-close {
  position: absolute;
  top: -40px; right: 0;
  background: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}
.video-modal-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  color: var(--text-muted);
  font-size: 1rem;
  flex-direction: column;
  gap: 16px;
}
.video-modal-placeholder .play-icon { font-size: 4rem; color: var(--accent); }