/* ===== 海角传媒 - 主样式文件 ===== */
/* 品牌色彩系统 */
:root {
  --brand-primary: #7c3aed;
  --brand-secondary: #c084fc;
  --brand-accent: #f59e0b;
  --brand-rose: #e11d48;
  --brand-dark: #1a0a2e;
  --brand-darker: #0f0618;
  --brand-light: #f5f0ff;
  --brand-gradient: linear-gradient(135deg, #7c3aed 0%, #c084fc 50%, #f59e0b 100%);
  --brand-gradient-dark: linear-gradient(135deg, #1a0a2e 0%, #2d1b69 100%);
  --text-primary: #1a0a2e;
  --text-secondary: #6b7280;
  --text-light: #f9fafb;
  --border-color: #e5e7eb;
  --card-shadow: 0 4px 24px rgba(124, 58, 237, 0.12);
  --card-shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.25);
  --border-radius: 12px;
  --border-radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 重置与基础 ===== */
*, *::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-primary);
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--brand-gradient);
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  letter-spacing: 0.5px;
}
.top-bar a { color: #fff; font-weight: 600; text-decoration: underline; }

/* ===== 头部导航 ===== */
.site-header {
  background: #fff;
  box-shadow: 0 2px 20px rgba(124, 58, 237, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 800;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.site-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}
.site-logo .logo-text { display: flex; flex-direction: column; }
.site-logo .logo-sub { font-size: 11px; font-weight: 400; color: var(--text-secondary); -webkit-text-fill-color: var(--text-secondary); }

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  background: var(--brand-light);
  color: var(--brand-primary);
}
.nav-cta {
  background: var(--brand-gradient) !important;
  color: #fff !important;
  -webkit-text-fill-color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 20px !important;
  font-weight: 600 !important;
}
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 4px 15px rgba(124,58,237,0.4); }

/* 汉堡菜单 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}
.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--brand-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== 搜索框 ===== */
.search-bar-wrapper {
  background: var(--brand-light);
  border-bottom: 1px solid #ede9fe;
  padding: 12px 24px;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-form {
  flex: 1;
  display: flex;
  align-items: center;
  background: #fff;
  border: 2px solid #ede9fe;
  border-radius: 30px;
  padding: 6px 16px;
  transition: var(--transition);
  max-width: 600px;
}
.search-form:focus-within { border-color: var(--brand-primary); box-shadow: 0 0 0 3px rgba(124,58,237,0.1); }
.search-form input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 14px;
  background: transparent;
  color: var(--text-primary);
  padding: 4px 8px;
}
.search-form button {
  background: var(--brand-gradient);
  border: none;
  border-radius: 20px;
  color: #fff;
  padding: 6px 20px;
  font-size: 13px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}
.search-form button:hover { opacity: 0.9; transform: scale(1.02); }
.search-hot-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.search-hot-tags span { font-size: 12px; color: var(--text-secondary); }
.hot-tag {
  font-size: 12px;
  padding: 3px 10px;
  background: #fff;
  border: 1px solid #ede9fe;
  border-radius: 12px;
  color: var(--brand-primary);
  cursor: pointer;
  transition: var(--transition);
}
.hot-tag:hover { background: var(--brand-primary); color: #fff; border-color: var(--brand-primary); }

/* ===== 面包屑 ===== */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { color: var(--brand-primary); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: #d1d5db; }

/* ===== 容器 ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section { padding: 60px 0; }
.section-sm { padding: 40px 0; }

/* ===== 区块标题 ===== */
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block;
  background: var(--brand-light);
  color: var(--brand-primary);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 12px;
}
.section-title .highlight {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ===== 英雄横幅 ===== */
.hero-banner {
  position: relative;
  min-height: 560px;
  background: var(--brand-gradient-dark);
  overflow: hidden;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.35;
  transition: opacity 0.5s ease;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,10,46,0.85) 0%, rgba(124,58,237,0.4) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  color: #fff;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(245,158,11,0.2);
  border: 1px solid rgba(245,158,11,0.4);
  color: #fbbf24;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(32px, 6vw, 64px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.hero-title .brand-name {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc { font-size: 18px; color: rgba(255,255,255,0.85); max-width: 560px; margin-bottom: 36px; line-height: 1.7; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  background: var(--brand-gradient);
  color: #fff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 20px rgba(124,58,237,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(124,58,237,0.5); }
.btn-outline {
  background: transparent;
  color: #fff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid rgba(255,255,255,0.5);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 32px; font-weight: 900; color: #fbbf24; }
.hero-stat .label { font-size: 13px; color: rgba(255,255,255,0.7); margin-top: 4px; }

/* 轮播指示器 */
.hero-indicators {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 3;
}
.hero-indicators span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}
.hero-indicators span.active { background: #fff; width: 24px; border-radius: 4px; }

/* ===== 视频卡片网格 ===== */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.video-card {
  background: #fff;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--card-shadow-hover); }
.video-thumb {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
  background: var(--brand-dark);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: var(--transition);
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.4); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.7);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }
.play-icon svg { width: 24px; height: 24px; fill: var(--brand-primary); margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--brand-rose);
  color: #fff;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 700;
}
.video-info { padding: 14px 16px; }
.video-title { font-size: 14px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; align-items: center; justify-content: space-between; font-size: 12px; color: var(--text-secondary); }
.video-stats { display: flex; gap: 12px; }
.video-stats span { display: flex; align-items: center; gap: 4px; }
.video-author { display: flex; align-items: center; gap: 6px; }
.video-author img { width: 20px; height: 20px; border-radius: 50%; object-fit: cover; }

/* ===== 特色模块卡片 ===== */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.feature-card {
  background: #fff;
  border-radius: var(--border-radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  border: 1px solid transparent;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); border-color: var(--brand-secondary); }
.feature-icon {
  width: 60px;
  height: 60px;
  background: var(--brand-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 28px;
  transition: var(--transition);
}
.feature-card:hover .feature-icon { background: var(--brand-gradient); }
.feature-title { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.feature-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ===== 专家展示 ===== */
.expert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px; }
.expert-card {
  background: #fff;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-6px); box-shadow: var(--card-shadow-hover); }
.expert-photo {
  position: relative;
  aspect-ratio: 1;
  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;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(26,10,46,0.9));
  padding: 20px 16px 12px;
  color: #fff;
}
.expert-name { font-size: 18px; font-weight: 800; }
.expert-role { font-size: 13px; color: rgba(255,255,255,0.8); }
.expert-body { padding: 16px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.expert-tag {
  font-size: 11px;
  padding: 3px 10px;
  background: var(--brand-light);
  color: var(--brand-primary);
  border-radius: 12px;
  font-weight: 600;
}
.expert-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; }
.expert-actions { display: flex; gap: 8px; }
.btn-sm {
  flex: 1;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.btn-sm-primary { background: var(--brand-gradient); color: #fff; }
.btn-sm-outline { background: transparent; border: 1px solid var(--brand-primary); color: var(--brand-primary); }
.btn-sm:hover { transform: translateY(-1px); opacity: 0.9; }

/* ===== 合作品牌Logo墙 ===== */
.partner-wall {
  background: var(--brand-light);
  border-radius: var(--border-radius-lg);
  padding: 40px;
}
.partner-logos { display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; align-items: center; }
.partner-logo {
  background: #fff;
  border-radius: 10px;
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-logo:hover { color: var(--brand-primary); box-shadow: 0 4px 20px rgba(124,58,237,0.15); transform: translateY(-2px); }

/* ===== 用户评价 ===== */
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.review-card {
  background: #fff;
  border-radius: var(--border-radius-lg);
  padding: 24px;
  box-shadow: var(--card-shadow);
  border: 1px solid #f3f4f6;
  transition: var(--transition);
}
.review-card:hover { box-shadow: var(--card-shadow-hover); transform: translateY(-3px); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.reviewer-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
}
.reviewer-info { flex: 1; }
.reviewer-name { font-size: 15px; font-weight: 700; }
.reviewer-meta { font-size: 12px; color: var(--text-secondary); }
.review-stars { color: #f59e0b; font-size: 16px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.review-date { font-size: 12px; color: #d1d5db; margin-top: 12px; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border-radius: var(--border-radius);
  margin-bottom: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  overflow: hidden;
  border: 1px solid #f3f4f6;
}
.faq-question {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}
.faq-question:hover { color: var(--brand-primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 300;
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-icon { background: var(--brand-primary); color: #fff; transform: rotate(45deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-info h3 { font-size: 20px; font-weight: 800; margin-bottom: 20px; }
.contact-item { display: flex; gap: 14px; margin-bottom: 16px; align-items: flex-start; }
.contact-icon { width: 40px; height: 40px; background: var(--brand-light); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.contact-text { font-size: 14px; }
.contact-text strong { display: block; color: var(--text-primary); margin-bottom: 2px; }
.contact-text span { color: var(--text-secondary); }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qr-card { text-align: center; background: #fff; border-radius: var(--border-radius); padding: 20px; box-shadow: var(--card-shadow); }
.qr-card img { width: 120px; height: 120px; margin: 0 auto 10px; object-fit: contain; }
.qr-card p { font-size: 13px; color: var(--text-secondary); font-weight: 600; }

/* ===== 社交分享 ===== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-secondary); font-weight: 600; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; box-shadow: 0 4px 15px rgba(0,0,0,0.2); }

/* ===== 底部 ===== */
.site-footer {
  background: var(--brand-darker);
  color: rgba(255,255,255,0.8);
  padding: 60px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand .logo-text { -webkit-text-fill-color: #fff; }
.footer-brand .logo-sub { -webkit-text-fill-color: rgba(255,255,255,0.6); }
.footer-desc { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-icon {
  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: var(--transition);
  cursor: pointer;
}
.social-icon:hover { background: var(--brand-primary); transform: translateY(-2px); }
.footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 13px; color: rgba(255,255,255,0.6); transition: var(--transition); }
.footer-links a:hover { color: var(--brand-secondary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: var(--brand-secondary); }

/* ===== 统计数据条 ===== */
.stats-bar {
  background: var(--brand-gradient-dark);
  padding: 40px 0;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat-item .num { font-size: 36px; font-weight: 900; background: var(--brand-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-item .label { font-size: 14px; color: rgba(255,255,255,0.7); margin-top: 6px; }

/* ===== 标签页 ===== */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid #f3f4f6; margin-bottom: 32px; flex-wrap: wrap; }
.tab-btn {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border: none;
  background: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
  border-radius: 8px 8px 0 0;
}
.tab-btn:hover { color: var(--brand-primary); background: var(--brand-light); }
.tab-btn.active { color: var(--brand-primary); border-bottom-color: var(--brand-primary); background: var(--brand-light); }

/* ===== 内页头部 ===== */
.page-hero {
  background: var(--brand-gradient-dark);
  padding: 60px 0;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(124,58,237,0.3) 0%, transparent 70%);
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(28px, 5vw, 48px); font-weight: 900; margin-bottom: 12px; }
.page-hero p { font-size: 16px; color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto; }

/* ===== 加载更多 ===== */
.load-more-wrap { text-align: center; margin-top: 40px; }
.btn-load-more {
  background: transparent;
  border: 2px solid var(--brand-primary);
  color: var(--brand-primary);
  padding: 12px 40px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-load-more:hover { background: var(--brand-primary); color: #fff; transform: translateY(-2px); }

/* ===== 横幅广告区 ===== */
.promo-banner {
  background: var(--brand-gradient);
  border-radius: var(--border-radius-lg);
  padding: 40px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.promo-text h3 { font-size: 24px; font-weight: 800; margin-bottom: 8px; }
.promo-text p { font-size: 15px; opacity: 0.9; }
.btn-white { background: #fff; color: var(--brand-primary); padding: 12px 28px; border-radius: 25px; font-weight: 700; font-size: 15px; transition: var(--transition); border: none; cursor: pointer; }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .header-inner { height: 60px; }
  .main-nav { display: none; position: absolute; top: 60px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); gap: 4px; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; border-radius: 8px; }
  .menu-toggle { display: flex; }
  .hero-banner { min-height: 400px; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .search-bar-inner { flex-direction: column; }
  .search-hot-tags { justify-content: center; }
  .qr-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 辅助类 ===== */
.text-center { text-align: center; }
.text-gradient { background: var(--brand-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.bg-light { background: var(--brand-light); }
.bg-dark { background: var(--brand-dark); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.hidden { display: none; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 16px; }
.rounded { border-radius: var(--border-radius); }
.shadow { box-shadow: var(--card-shadow); }

/* ===== 动画 ===== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }
.animate-fadeInUp { animation: fadeInUp 0.6s ease forwards; }
.live-dot { display: inline-block; width: 8px; height: 8px; background: #ef4444; border-radius: 50%; animation: pulse 1.5s infinite; margin-right: 6px; }

/* ===== 视频模态框 ===== */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.modal-inner {
  background: #000;
  border-radius: 16px;
  overflow: hidden;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.2);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.modal-close:hover { background: rgba(255,255,255,0.4); }
.modal-video { width: 100%; aspect-ratio: 16/9; background: #111; display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5); font-size: 16px; }

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