/* ===== 海角传媒 主样式 ===== */
/* mfrdm.cn - 海角视频社区 */

:root {
  --primary: #1a3a5c;
  --secondary: #f0a500;
  --accent: #e84c6a;
  --bg-dark: #0d1f33;
  --bg-light: #f5f7fa;
  --text-main: #222;
  --text-muted: #666;
  --text-light: #fff;
  --border: #e0e6ef;
  --card-shadow: 0 4px 24px rgba(26,58,92,0.10);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.25s 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: inherit; 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; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--primary);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  padding: 6px 0;
  text-align: center;
}
.top-bar a { color: var(--secondary); }

/* ===== 导航 ===== */
.site-header {
  background: #fff;
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img {
  height: 44px;
  width: auto;
}
.logo-text {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 2px;
}
.logo-text span { color: var(--secondary); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.site-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}
.site-nav a:hover,
.site-nav a.active {
  background: var(--primary);
  color: #fff;
}
.site-nav a.hot { color: var(--accent); }
.site-nav a.hot::after { content: ' 热'; font-size: 11px; background: var(--accent); color: #fff; padding: 1px 4px; border-radius: 3px; margin-left: 3px; }

/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border: 1.5px solid var(--border);
  border-radius: 24px;
  overflow: hidden;
  flex-shrink: 0;
}
.header-search input {
  border: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 14px;
  width: 180px;
  outline: none;
  color: var(--text-main);
}
.header-search button {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 14px;
  transition: background var(--transition);
}
.header-search button:hover { background: var(--secondary); }

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* 搜索栏（导航下方） */
.nav-search-bar {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.nav-search-bar .container {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-search-bar .search-wrap {
  flex: 1;
  max-width: 640px;
  display: flex;
  background: #fff;
  border: 2px solid var(--primary);
  border-radius: 28px;
  overflow: hidden;
}
.nav-search-bar input {
  flex: 1;
  border: none;
  outline: none;
  padding: 10px 18px;
  font-size: 15px;
}
.nav-search-bar button {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 10px 24px;
  font-size: 15px;
  cursor: pointer;
  font-weight: 600;
  transition: background var(--transition);
}
.nav-search-bar button:hover { background: var(--secondary); }
.search-hot-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-hot-tags span { font-size: 13px; color: var(--text-muted); }
.search-hot-tags a {
  font-size: 13px;
  color: var(--primary);
  background: rgba(26,58,92,0.07);
  padding: 2px 10px;
  border-radius: 12px;
  transition: background var(--transition);
}
.search-hot-tags a:hover { background: var(--primary); color: #fff; }

/* ===== 通用容器 ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--bg-light);
  padding: 10px 0;
  font-size: 13px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb a:hover { color: var(--secondary); }
.breadcrumb span { margin: 0 6px; }

/* ===== Hero 横幅 ===== */
.hero {
  position: relative;
  background: var(--bg-dark);
  overflow: hidden;
  min-height: 520px;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.45;
}
.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 640px;
}
.hero-tag {
  display: inline-block;
  background: var(--secondary);
  color: #fff;
  font-size: 13px;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  font-weight: 600;
  letter-spacing: 1px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 52px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.hero p {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 28px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}
.btn-primary { background: var(--secondary); color: #fff; }
.btn-primary:hover { background: #d4920a; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(240,165,0,0.4); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.7); }
.btn-outline:hover { background: rgba(255,255,255,0.15); }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ===== 区块标题 ===== */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-light); }
.section-dark { background: var(--bg-dark); color: #fff; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header .label {
  display: inline-block;
  background: rgba(240,165,0,0.12);
  color: var(--secondary);
  font-size: 13px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.section-header h2 {
  font-size: clamp(22px, 3vw, 36px);
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 12px;
}
.section-dark .section-header h2 { color: #fff; }
.section-header p { font-size: 16px; color: var(--text-muted); max-width: 600px; margin: 0 auto; }
.section-dark .section-header p { color: rgba(255,255,255,0.7); }
.section-header .more-link {
  display: inline-block;
  margin-top: 8px;
  color: var(--secondary);
  font-size: 14px;
  font-weight: 600;
}

/* ===== 视频卡片 ===== */
.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(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(26,58,92,0.18); }
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  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);
  transition: background var(--transition);
  opacity: 0;
}
.video-card:hover .play-btn { opacity: 1; background: rgba(0,0,0,0.35); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(240,165,0,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: transform var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  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: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 14px 16px 16px; }
.video-info h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.video-meta .views::before { content: '▶ '; }
.video-meta .likes::before { content: '♥ '; color: var(--accent); }
.video-meta .comments::before { content: '💬 '; }
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-muted);
}
.video-author img {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  object-fit: cover;
}

/* ===== 图片卡片 ===== */
.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;
  cursor: pointer;
  box-shadow: var(--card-shadow);
}
.img-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.img-card:hover img { transform: scale(1.08); }
.img-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 16px;
  color: #fff;
  opacity: 0;
  transition: opacity var(--transition);
}
.img-card:hover .img-card-overlay { opacity: 1; }
.img-card-overlay h4 { font-size: 14px; font-weight: 700; }
.img-card-overlay span { font-size: 12px; opacity: 0.8; }

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.expert-card:hover { transform: translateY(-4px); }
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--secondary);
}
.expert-name { font-size: 18px; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.expert-title { font-size: 13px; color: var(--text-muted); margin-bottom: 12px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.expert-tag {
  font-size: 12px;
  background: rgba(26,58,92,0.08);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 12px;
}
.expert-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; }
.expert-btns { display: flex; gap: 10px; justify-content: center; }
.btn-expert {
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}
.btn-expert-primary { background: var(--primary); color: #fff; }
.btn-expert-primary:hover { background: var(--secondary); }
.btn-expert-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-expert-outline:hover { background: var(--primary); color: #fff; }

/* ===== 统计数字 ===== */
.stats-bar {
  background: var(--primary);
  padding: 32px 0;
  color: #fff;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item h3 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900;
  color: var(--secondary);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-item p { font-size: 14px; opacity: 0.8; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--primary);
  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::after {
  content: '+';
  font-size: 22px;
  font-weight: 400;
  color: var(--secondary);
  transition: transform var(--transition);
}
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 16px 24px; }

/* ===== 评论/口碑 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--card-shadow);
  border-left: 4px solid var(--secondary);
}
.review-stars { color: var(--secondary); font-size: 18px; margin-bottom: 10px; }
.review-text { font-size: 15px; color: var(--text-main); line-height: 1.7; margin-bottom: 14px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}
.review-name { font-weight: 700; font-size: 14px; }
.review-date { font-size: 12px; color: var(--text-muted); }

/* ===== 合作品牌 ===== */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 700;
  color: var(--primary);
  transition: all var(--transition);
  text-align: center;
  min-width: 140px;
}
.partner-item:hover { border-color: var(--secondary); color: var(--secondary); transform: translateY(-2px); }

/* ===== 联系信息 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 { font-size: 22px; font-weight: 800; 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;
  background: rgba(26,58,92,0.08);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-item h4 { font-size: 14px; color: var(--text-muted); margin-bottom: 2px; }
.contact-item p { font-size: 15px; font-weight: 600; color: var(--text-main); }
.qr-group { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img { width: 120px; height: 120px; border-radius: 10px; border: 2px solid var(--border); margin-bottom: 8px; object-fit: cover; }
.qr-item p { font-size: 13px; color: var(--text-muted); }

/* ===== 社区功能 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.feature-card:hover { transform: translateY(-4px); }
.feature-icon { font-size: 36px; margin-bottom: 12px; }
.feature-card h4 { font-size: 16px; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.feature-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ===== AI赋能 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, rgba(26,58,92,0.05) 0%, rgba(240,165,0,0.05) 100%);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all var(--transition);
}
.ai-card:hover { border-color: var(--secondary); box-shadow: 0 8px 32px rgba(240,165,0,0.15); }
.ai-num { font-size: 40px; font-weight: 900; color: rgba(240,165,0,0.2); line-height: 1; margin-bottom: 12px; }
.ai-card h4 { font-size: 18px; font-weight: 800; color: var(--primary); margin-bottom: 10px; }
.ai-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== 分享按钮 ===== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}
.share-bar span { font-size: 14px; color: var(--text-muted); }
.share-btn {
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  color: #fff;
}
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #010101; }
.share-bilibili { background: #00a1d6; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* ===== 底部 ===== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-text { color: #fff; font-size: 24px; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-bottom: 16px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: background var(--transition);
  cursor: pointer;
}
.social-btn:hover { background: var(--secondary); }
.footer-col h4 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 14px; color: rgba(255,255,255,0.65); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--secondary); }
.footer-bottom {
  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(255,255,255,0.6); }
.footer-bottom a:hover { color: var(--secondary); }
.update-time { color: rgba(255,255,255,0.45); font-size: 13px; }

/* ===== 标签页 ===== */
.tab-nav {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 28px;
  overflow-x: auto;
}
.tab-btn {
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
  transition: all var(--transition);
}
.tab-btn.active, .tab-btn:hover { color: var(--primary); border-bottom-color: var(--primary); }

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.page-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: #fff;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--text-main);
}
.page-btn:hover, .page-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 内页 Banner ===== */
.page-banner {
  background: linear-gradient(135deg, var(--primary) 0%, #2a5a8c 100%);
  padding: 60px 0;
  color: #fff;
  text-align: center;
}
.page-banner h1 { font-size: clamp(24px, 4vw, 42px); font-weight: 900; margin-bottom: 12px; }
.page-banner p { font-size: 16px; opacity: 0.85; max-width: 600px; margin: 0 auto; }

/* ===== 内页内容 ===== */
.page-content { padding: 48px 0; }
.page-intro {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--card-shadow);
  margin-bottom: 36px;
  border-left: 4px solid var(--secondary);
}
.page-intro h2 { font-size: 20px; font-weight: 800; color: var(--primary); margin-bottom: 12px; }
.page-intro p { font-size: 15px; color: var(--text-muted); line-height: 1.8; }

/* ===== 通知栏 ===== */
.notice-bar {
  background: linear-gradient(90deg, var(--secondary), #e84c6a);
  color: #fff;
  padding: 10px 0;
  overflow: hidden;
}
.notice-inner {
  display: flex;
  align-items: center;
  gap: 16px;
}
.notice-label {
  background: rgba(0,0,0,0.2);
  padding: 3px 12px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.notice-scroll {
  overflow: hidden;
  flex: 1;
}
.notice-text {
  display: flex;
  gap: 40px;
  animation: scroll-notice 20s linear infinite;
  white-space: nowrap;
  font-size: 14px;
}
.notice-text a { color: #fff; opacity: 0.9; }
@keyframes scroll-notice {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

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

@media (max-width: 768px) {
  .site-nav { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: #fff; padding: 16px; box-shadow: 0 8px 24px rgba(0,0,0,0.1); z-index: 998; }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 16px; border-radius: var(--radius-sm); }
  .nav-toggle { display: flex; }
  .header-search { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .ai-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { min-height: 380px; }
  .section { padding: 40px 0; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .header-inner { height: 58px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
  .img-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 懒加载占位 ===== */
img[data-src] { background: #e8eef5; }

/* ===== 滚动条美化 ===== */
::-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); }

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease both; }
.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }

/* ===== 视频播放弹窗 ===== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: #111;
  border-radius: var(--radius);
  max-width: 800px;
  width: 90%;
  overflow: hidden;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(255,255,255,0.15);
  border: none;
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  z-index: 1;
  transition: background var(--transition);
}
.modal-close:hover { background: var(--accent); }
.modal-video {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  font-size: 16px;
}

/* ===== How-To 步骤 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.step-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
  position: relative;
}
.step-num {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  margin: 0 auto 16px;
}
.step-card h4 { font-size: 16px; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.step-card p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }