/* 糖心 - 主样式文件 | cofswu.cn */
:root {
  --primary: #e8436a;
  --primary-dark: #c42d54;
  --secondary: #ff7b54;
  --accent: #7c3aed;
  --dark: #0d0d1a;
  --dark2: #13131f;
  --dark3: #1a1a2e;
  --dark4: #22223b;
  --text: #e8e8f0;
  --text-muted: #8888aa;
  --border: #2a2a3e;
  --card-bg: #16162a;
  --gradient: linear-gradient(135deg, #e8436a 0%, #ff7b54 100%);
  --gradient2: linear-gradient(135deg, #7c3aed 0%, #e8436a 100%);
  --shadow: 0 4px 24px rgba(232,67,106,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
  font-size: 15px;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--secondary); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark2); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--gradient);
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  color: #fff;
  letter-spacing: 1px;
}
.top-bar a { color: #fff; text-decoration: underline; }

/* ===== 头部导航 ===== */
.site-header {
  background: rgba(13,13,26,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0 20px;
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img { height: 36px; width: auto; }
.logo-text {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 主导航 ===== */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--text);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary);
  background: rgba(232,67,106,0.1);
}

/* ===== 搜索框 ===== */
.header-search {
  display: flex;
  align-items: center;
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 200px;
  transition: var(--transition);
}
.header-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232,67,106,0.15);
}
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 14px;
  width: 100%;
}
.header-search input::placeholder { color: var(--text-muted); }
.search-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 16px;
  padding: 0;
  transition: var(--transition);
}
.search-btn:hover { color: var(--primary); }

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

/* ===== 英雄区 ===== */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--dark2);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.4);
  transition: opacity 1s ease;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(13,13,26,0.9) 40%, rgba(13,13,26,0.3) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 20px;
  max-width: 600px;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,67,106,0.15);
  border: 1px solid rgba(232,67,106,0.3);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  color: #fff;
}
.hero h1 span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p {
  font-size: 16px;
  color: #ccc;
  margin-bottom: 32px;
  max-width: 480px;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(232,67,106,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,67,106,0.5); color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ===== 轮播指示器 ===== */
.hero-indicators {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 3;
}
.indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}
.indicator.active { background: var(--primary); width: 24px; border-radius: 4px; }

/* ===== 统计数字 ===== */
.stats-bar {
  background: var(--dark3);
  border-bottom: 1px solid var(--border);
  padding: 24px 20px;
}
.stats-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 20px;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

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

/* ===== 区块标题 ===== */
.section { padding: 64px 20px; }
.section-alt { background: var(--dark2); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block;
  background: rgba(232,67,106,0.1);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  margin-bottom: 12px;
  border: 1px solid rgba(232,67,106,0.2);
}
.section-title {
  font-size: clamp(22px, 3.5vw, 36px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.section-title span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.section-desc { color: var(--text-muted); font-size: 15px; max-width: 560px; margin: 0 auto; }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(232,67,106,0.3); }
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark3);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.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 .play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(232,67,106,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  width: 0;
  height: 0;
  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: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}
.video-stats { display: flex; gap: 12px; }
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ===== 功能卡片 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}
.feature-card:hover { border-color: var(--primary); transform: translateY(-3px); box-shadow: var(--shadow); }
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 18px;
  background: rgba(232,67,106,0.1);
}
.feature-card h3 { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  text-align: center;
}
.expert-card:hover { border-color: var(--primary); transform: translateY(-3px); box-shadow: var(--shadow); }
.expert-avatar {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: top;
}
.expert-info { padding: 20px; }
.expert-name { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.expert-title { font-size: 13px; color: var(--primary); margin-bottom: 10px; }
.expert-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.award-tag {
  background: rgba(124,58,237,0.15);
  color: #a78bfa;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid rgba(124,58,237,0.2);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }

/* ===== 社区功能 ===== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.community-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}
.community-card:hover { border-color: var(--primary); background: rgba(232,67,106,0.05); transform: translateY(-2px); }
.community-icon { font-size: 36px; margin-bottom: 12px; }
.community-card h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.community-card p { font-size: 12px; color: var(--text-muted); }
.community-badge {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  margin-top: 8px;
}

/* ===== 图片展示 ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.gallery-item {
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 3/4;
  position: relative;
  cursor: pointer;
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.gallery-item:hover img { transform: scale(1.06); }
.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 12px;
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-overlay span { color: #fff; font-size: 13px; font-weight: 500; }

/* ===== AI赋能 ===== */
.ai-section { background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%); }
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.ai-features { display: flex; flex-direction: column; gap: 20px; }
.ai-feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.ai-feature-item:hover { border-color: var(--primary); }
.ai-icon { font-size: 28px; flex-shrink: 0; }
.ai-feature-item h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.ai-feature-item p { font-size: 13px; color: var(--text-muted); }
.ai-visual { position: relative; }
.ai-visual img { border-radius: var(--radius); width: 100%; }
.ai-badge {
  position: absolute;
  top: -12px;
  right: -12px;
  background: var(--gradient);
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(232,67,106,0.4);
}

/* ===== 合作品牌 ===== */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.partner-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover { border-color: var(--primary); color: var(--primary); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-question {
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-question::after {
  content: '+';
  font-size: 22px;
  color: var(--primary);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-question::after { 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-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ===== 用户评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(232,67,106,0.3); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
  font-weight: 700;
  flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 600; color: #fff; }
.review-date { font-size: 12px; color: var(--text-muted); }
.review-stars { color: #fbbf24; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
.review-tag {
  display: inline-block;
  background: rgba(232,67,106,0.1);
  color: var(--primary);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  margin-top: 10px;
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 20px; }
.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 20px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.contact-icon { font-size: 24px; flex-shrink: 0; }
.contact-item h4 { font-size: 14px; font-weight: 600; color: var(--text-muted); margin-bottom: 4px; }
.contact-item p, .contact-item a { font-size: 15px; color: var(--text); }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qr-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.qr-card img { width: 120px; height: 120px; object-fit: cover; border-radius: var(--radius-sm); margin: 0 auto 12px; }
.qr-card h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 4px; }
.qr-card p { font-size: 12px; color: var(--text-muted); }

/* ===== 社交分享 ===== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  transition: var(--transition);
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); }
.share-wechat:hover { border-color: #07c160; color: #07c160; }
.share-weibo:hover { border-color: #e6162d; color: #e6162d; }
.share-douyin:hover { border-color: #010101; color: #fff; background: #010101; }
.share-bilibili:hover { border-color: #00a1d6; color: #00a1d6; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--dark2);
  border-top: 1px solid var(--border);
  padding: 60px 20px 30px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p { font-size: 14px; color: var(--text-muted); line-height: 1.8; margin-top: 14px; max-width: 300px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.footer-logo img { height: 32px; }
.footer-logo span { font-size: 18px; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.footer-col h5 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 14px; color: var(--text-muted); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--dark2);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--text-muted); }
.breadcrumb-inner a:hover { color: var(--primary); }
.breadcrumb-inner span { color: var(--primary); }

/* ===== 内页头部 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%);
  padding: 60px 20px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(24px, 4vw, 42px); font-weight: 800; color: #fff; margin-bottom: 12px; }
.page-hero h1 span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.page-hero p { font-size: 15px; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

/* ===== 标签 ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
.tag {
  background: rgba(232,67,106,0.1);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  border: 1px solid rgba(232,67,106,0.2);
}

/* ===== 分页 ===== */
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 40px; }
.page-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  transition: var(--transition);
}
.page-btn:hover, .page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ===== 加载动画 ===== */
.skeleton {
  background: linear-gradient(90deg, var(--dark3) 25%, var(--dark4) 50%, var(--dark3) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== 滚动动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== 悬浮按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
  border: none;
  box-shadow: 0 4px 20px rgba(232,67,106,0.4);
}
.back-to-top.show { opacity: 1; transform: translateY(0); }
.back-to-top::after { content: '↑'; color: #fff; font-size: 18px; font-weight: bold; }

/* ===== 热门标签 ===== */
.hot-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hot-tag {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.hot-tag:hover { border-color: var(--primary); color: var(--primary); }
.hot-tag.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ===== 弹幕效果 ===== */
.danmu-container {
  position: relative;
  overflow: hidden;
  height: 48px;
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius-sm);
  margin: 16px 0;
}
.danmu-item {
  position: absolute;
  white-space: nowrap;
  font-size: 14px;
  color: #fff;
  padding: 4px 12px;
  background: rgba(232,67,106,0.3);
  border-radius: 20px;
  animation: danmu-move 8s linear infinite;
  top: 50%;
  transform: translateY(-50%);
}
@keyframes danmu-move {
  from { right: -300px; }
  to { right: 110%; }
}

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

@media (max-width: 768px) {
  .main-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--dark2); border-bottom: 1px solid var(--border); flex-direction: column; padding: 16px; gap: 4px; }
  .main-nav.open { display: flex; }
  .menu-toggle { display: flex; }
  .header-search { display: none; }
  .hero { min-height: 420px; }
  .hero-content { padding: 60px 20px; }
  .stats-inner { gap: 16px; }
  .stat-num { font-size: 22px; }
  .section { padding: 48px 20px; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .expert-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
  .qr-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 24px; }
  .hero-btns { flex-direction: column; }
  .btn { justify-content: center; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
}