/* ============================================
   91 - 全新原创CSS主题样式
   配色方案：深海墨蓝 + 翡翠青 + 珊瑚橘 + 月光银
   布局体系：CSS Grid + Flexbox 混合原创布局
   ============================================ */
:root {
  --bg-primary: #060D16;
  --bg-secondary: #0C1A2A;
  --bg-card: #0F2236;
  --bg-card-hover: #143050;
  --accent-teal: #00D4AA;
  --accent-teal-dark: #00A888;
  --accent-coral: #FF6B4A;
  --accent-coral-dark: #E05535;
  --accent-gold: #FFB84D;
  --text-primary: #E8EDF3;
  --text-secondary: #8FA3B8;
  --text-muted: #5A7088;
  --border-color: #1A3048;
  --border-light: #244060;
  --gradient-hero: linear-gradient(135deg, #060D16 0%, #0C1A2A 40%, #0A2540 100%);
  --gradient-teal: linear-gradient(135deg, #00D4AA, #00A888);
  --gradient-coral: linear-gradient(135deg, #FF6B4A, #FF8F70);
  --gradient-card: linear-gradient(180deg, #0F2236 0%, #0A1828 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-teal: 0 4px 20px rgba(0,212,170,0.2);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --font-main: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei','WenQuanYi Micro Hei',sans-serif;
  --transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
  --max-width: 1280px;
}
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; font-size:16px; }
body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-teal); text-decoration:none; transition: var(--transition); }
a:hover { color: var(--accent-coral); }
img { max-width:100%; height:auto; display:block; }
ul,ol { list-style:none; }
.container { max-width: var(--max-width); margin:0 auto; padding:0 24px; }

/* === 顶部导航栏 === */
.site-header {
  position: fixed; top:0; left:0; right:0; z-index:1000;
  background: rgba(6,13,22,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.site-header.scrolled { background: rgba(6,13,22,0.98); }
.header-inner {
  max-width: var(--max-width); margin:0 auto; padding:0 24px;
  display:flex; align-items:center; justify-content:space-between; height:68px;
}
.brand-logo { display:flex; align-items:center; gap:10px; }
.brand-logo img { height:38px; width:auto; }
.brand-logo span { font-size:1.3rem; font-weight:700; color: var(--text-primary); letter-spacing:1px; }
.main-nav { display:flex; align-items:center; gap:6px; }
.main-nav a {
  padding: 8px 18px; border-radius: var(--radius-sm);
  font-size: 0.95rem; color: var(--text-secondary); font-weight:500;
  transition: var(--transition); position:relative;
}
.main-nav a:hover, .main-nav a.active { color: var(--accent-teal); background: rgba(0,212,170,0.08); }
.main-nav a.active::after {
  content:''; position:absolute; bottom:2px; left:50%; transform:translateX(-50%);
  width:20px; height:2px; background: var(--gradient-teal); border-radius:2px;
}
.nav-toggle { display:none; flex-direction:column; gap:5px; cursor:pointer; padding:8px; }
.nav-toggle span { width:24px; height:2px; background: var(--text-primary); border-radius:2px; transition: var(--transition); }

/* === Hero区域 === */
.hero-section {
  position:relative; min-height:100vh; display:flex; align-items:center;
  padding-top:68px; overflow:hidden; background: var(--gradient-hero);
}
.hero-bg-overlay {
  position:absolute; inset:0;
  background: radial-gradient(ellipse at 70% 30%, rgba(0,212,170,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 20% 80%, rgba(255,107,74,0.06) 0%, transparent 50%);
}
.hero-grid { display:grid; grid-template-columns: 1fr 1fr; gap:60px; align-items:center; position:relative; z-index:2; }
.hero-content { padding: 40px 0; }
.hero-badge {
  display:inline-flex; align-items:center; gap:8px;
  padding: 6px 16px; border-radius: var(--radius-xl);
  background: rgba(0,212,170,0.1); border: 1px solid rgba(0,212,170,0.25);
  font-size:0.85rem; color: var(--accent-teal); margin-bottom:24px;
}
.hero-badge::before { content:''; width:6px; height:6px; border-radius:50%; background: var(--accent-teal); animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.5)} }
.hero-content h1 {
  font-size: 3.2rem; font-weight:800; line-height:1.2; margin-bottom:20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-teal) 100%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.hero-content h2 { font-size:1.3rem; font-weight:400; color: var(--text-secondary); margin-bottom:32px; line-height:1.8; }
.hero-actions { display:flex; gap:16px; flex-wrap:wrap; }
.btn-primary {
  display:inline-flex; align-items:center; gap:8px;
  padding: 14px 32px; border-radius: var(--radius-xl);
  background: var(--gradient-teal); color: var(--bg-primary);
  font-weight:600; font-size:1rem; border:none; cursor:pointer;
  transition: var(--transition); box-shadow: var(--shadow-teal);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow: 0 6px 30px rgba(0,212,170,0.35); color: var(--bg-primary); }
.btn-outline {
  display:inline-flex; align-items:center; gap:8px;
  padding: 14px 32px; border-radius: var(--radius-xl);
  background: transparent; color: var(--accent-teal);
  border: 1.5px solid var(--accent-teal); font-weight:600; font-size:1rem;
  cursor:pointer; transition: var(--transition);
}
.btn-outline:hover { background: rgba(0,212,170,0.1); transform:translateY(-2px); }
.hero-visual { position:relative; }
.hero-img-wrapper {
  position:relative; border-radius: var(--radius-lg); overflow:hidden; box-shadow: var(--shadow-lg);
}
.hero-img-wrapper img { width:100%; height:auto; display:block; }
.hero-img-wrapper::after {
  content:''; position:absolute; inset:0;
  background: linear-gradient(180deg, transparent 50%, rgba(6,13,22,0.6) 100%);
}
.hero-float-card {
  position:absolute; padding:14px 20px; border-radius: var(--radius-md);
  background: rgba(12,26,42,0.9); backdrop-filter:blur(10px);
  border: 1px solid var(--border-light); box-shadow: var(--shadow-md);
}
.hero-float-card.card-views { bottom:20px; left:-30px; }
.hero-float-card.card-users { top:20px; right:-20px; }
.hero-float-card .card-num { font-size:1.5rem; font-weight:700; color: var(--accent-teal); }
.hero-float-card .card-label { font-size:0.8rem; color: var(--text-muted); }

/* === 统计数据条 === */
.stats-bar { background: var(--bg-secondary); border-top:1px solid var(--border-color); border-bottom:1px solid var(--border-color); padding:40px 0; }
.stats-grid { display:grid; grid-template-columns: repeat(4,1fr); gap:30px; }
.stat-item { text-align:center; }
.stat-num {
  font-size:2.4rem; font-weight:800;
  background: var(--gradient-teal); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.stat-label { font-size:0.9rem; color: var(--text-muted); margin-top:6px; }

/* === 通用区块标题 === */
.section-header { text-align:center; margin-bottom:50px; }
.section-tag {
  display:inline-block; padding:4px 14px; border-radius: var(--radius-xl);
  background: rgba(0,212,170,0.1); border:1px solid rgba(0,212,170,0.2);
  font-size:0.8rem; color: var(--accent-teal); margin-bottom:14px; letter-spacing:1px;
}
.section-header h2 { font-size:2.2rem; font-weight:700; margin-bottom:14px; color: var(--text-primary); }
.section-header h3 { font-size:1.6rem; font-weight:700; margin-bottom:10px; color: var(--text-primary); }
.section-header p { font-size:1rem; color: var(--text-secondary); max-width:650px; margin:0 auto; }

/* === 视频卡片网格 === */
.video-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.video-card {
  position:relative; border-radius: var(--radius-md); overflow:hidden;
  background: var(--gradient-card); border:1px solid var(--border-color);
  transition: var(--transition); cursor:pointer;
}
.video-card:hover { transform:translateY(-6px); border-color: var(--accent-teal); box-shadow: var(--shadow-teal); }
.video-thumb { position:relative; aspect-ratio:16/9; overflow:hidden; background: var(--bg-card); }
.video-thumb img { width:100%; height:100%; object-fit:cover; transition: var(--transition); }
.video-card:hover .video-thumb img { transform:scale(1.06); }
.play-btn {
  position:absolute; top:50%; left:50%; transform:translate(-50%,-50%) scale(0.8);
  width:56px; height:56px; border-radius:50%;
  background: rgba(0,212,170,0.9); display:flex; align-items:center; justify-content:center;
  opacity:0; transition: var(--transition); box-shadow: 0 4px 20px rgba(0,212,170,0.4);
}
.play-btn::after {
  content:''; width:0; height:0;
  border-top:10px solid transparent; border-bottom:10px solid transparent;
  border-left:16px solid var(--bg-primary); margin-left:3px;
}
.video-card:hover .play-btn { opacity:1; transform:translate(-50%,-50%) scale(1); }
.video-duration {
  position:absolute; bottom:8px; right:8px; padding:2px 8px;
  background: rgba(0,0,0,0.75); border-radius:4px; font-size:0.75rem; color:#fff;
}
.video-tag {
  position:absolute; top:8px; left:8px; padding:3px 10px;
  background: var(--gradient-coral); border-radius:4px; font-size:0.72rem; color:#fff; font-weight:600;
}
.video-info { padding:16px; }
.video-info h4 {
  font-size:0.95rem; font-weight:600; 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:0.8rem; color: var(--text-muted); }
.video-meta .views { color: var(--accent-teal); }

/* === 服务模块 === */
.services-section { padding:80px 0; }
.services-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.service-card {
  padding:32px 24px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color);
  transition: var(--transition); text-align:center;
}
.service-card:hover { transform:translateY(-4px); border-color: var(--accent-teal); box-shadow: var(--shadow-teal); }
.service-icon {
  width:64px; height:64px; border-radius: var(--radius-md);
  background: rgba(0,212,170,0.1); display:flex; align-items:center;
  justify-content:center; margin:0 auto 20px; font-size:1.8rem;
}
.service-card:nth-child(even) .service-icon { background: rgba(255,107,74,0.1); }
.service-card h4 { font-size:1.1rem; font-weight:600; color: var(--text-primary); margin-bottom:10px; }
.service-card p { font-size:0.88rem; color: var(--text-secondary); line-height:1.7; }

/* === AI赋能模块 === */
.ai-section { padding:80px 0; background: var(--bg-secondary); }
.ai-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.ai-card {
  padding:28px; border-radius: var(--radius-md);
  background: var(--bg-card); border:1px solid var(--border-color);
  transition: var(--transition); position:relative; overflow:hidden;
}
.ai-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background: var(--gradient-teal); opacity:0; transition: var(--transition);
}
.ai-card:hover { transform:translateY(-4px); border-color: var(--accent-teal); }
.ai-card:hover::before { opacity:1; }
.ai-card h4 { font-size:1.05rem; font-weight:600; color: var(--text-primary); margin-bottom:10px; }
.ai-card p { font-size:0.88rem; color: var(--text-secondary); line-height:1.7; }

/* === 弹幕区域 === */
.danmaku-section {
  padding:60px 0; position:relative; overflow:hidden;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}
.danmaku-track { position:relative; height:44px; margin-bottom:12px; overflow:hidden; }
.danmaku-item {
  position:absolute; white-space:nowrap; padding:8px 18px;
  border-radius: var(--radius-xl); font-size:0.88rem;
  background: rgba(15,34,54,0.85); border:1px solid var(--border-color);
  color: var(--text-secondary); animation: danmaku-scroll linear infinite;
  backdrop-filter: blur(4px);
}
@keyframes danmaku-scroll { 0%{transform:translateX(100vw)} 100%{transform:translateX(-100%)} }

/* === 社区功能 === */
.community-section { padding:80px 0; }
.community-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.community-card {
  padding:28px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color);
  transition: var(--transition); text-align:center;
}
.community-card:hover { transform:translateY(-4px); border-color: var(--accent-coral); box-shadow: 0 4px 20px rgba(255,107,74,0.15); }
.community-icon {
  width:56px; height:56px; border-radius:50%;
  background: rgba(255,107,74,0.1); display:flex; align-items:center;
  justify-content:center; margin:0 auto 16px; font-size:1.5rem;
}
.community-card h4 { font-size:1.05rem; font-weight:600; color: var(--text-primary); margin-bottom:8px; }
.community-card p { font-size:0.85rem; color: var(--text-secondary); line-height:1.7; }

/* === 专家团队 === */
.experts-section { padding:80px 0; background: var(--bg-secondary); }
.experts-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:28px; }
.expert-card {
  padding:28px; border-radius: var(--radius-md);
  background: var(--bg-card); border:1px solid var(--border-color);
  text-align:center; transition: var(--transition);
}
.expert-card:hover { transform:translateY(-4px); box-shadow: var(--shadow-teal); border-color: var(--accent-teal); }
.expert-avatar { width:90px; height:90px; border-radius:50%; overflow:hidden; margin:0 auto 16px; border:3px solid var(--border-light); }
.expert-avatar img { width:100%; height:100%; object-fit:cover; }
.expert-card h4 { font-size:1.05rem; font-weight:600; color: var(--text-primary); margin-bottom:4px; }
.expert-role { font-size:0.82rem; color: var(--accent-teal); margin-bottom:8px; }
.expert-desc { font-size:0.85rem; color: var(--text-secondary); line-height:1.6; }
.expert-creds { display:flex; flex-wrap:wrap; gap:6px; justify-content:center; margin-top:12px; }
.expert-creds span {
  padding:3px 10px; border-radius: var(--radius-xl);
  background: rgba(0,212,170,0.08); border:1px solid rgba(0,212,170,0.15);
  font-size:0.72rem; color: var(--accent-teal);
}

/* === 用户评价 === */
.reviews-section { padding:80px 0; }
.reviews-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.review-card {
  padding:28px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color);
  transition: var(--transition);
}
.review-card:hover { transform:translateY(-3px); box-shadow: var(--shadow-md); }
.review-stars { color: var(--accent-gold); font-size:1rem; margin-bottom:12px; letter-spacing:2px; }
.review-text { font-size:0.9rem; color: var(--text-secondary); line-height:1.7; margin-bottom:16px; font-style:italic; }
.review-author { display:flex; align-items:center; gap:10px; }
.review-author-avatar {
  width:40px; height:40px; border-radius:50%;
  background: var(--gradient-teal); display:flex; align-items:center;
  justify-content:center; font-size:0.9rem; color: var(--bg-primary); font-weight:700;
}
.review-author-name { font-size:0.88rem; font-weight:600; color: var(--text-primary); }
.review-author-title { font-size:0.75rem; color: var(--text-muted); }

/* === FAQ手风琴 === */
.faq-section { padding:80px 0; background: var(--bg-secondary); }
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  border:1px solid var(--border-color); border-radius: var(--radius-md);
  margin-bottom:12px; overflow:hidden; background: var(--bg-card);
}
.faq-question {
  padding:18px 24px; cursor:pointer; display:flex; align-items:center;
  justify-content:space-between; font-weight:600; font-size:0.95rem;
  color: var(--text-primary); transition: var(--transition);
}
.faq-question:hover { color: var(--accent-teal); }
.faq-toggle {
  width:28px; height:28px; border-radius:50%; background: rgba(0,212,170,0.1);
  display:flex; align-items:center; justify-content:center;
  font-size:1.2rem; color: var(--accent-teal); transition: var(--transition); flex-shrink:0;
}
.faq-item.active .faq-toggle { transform:rotate(45deg); background: var(--gradient-teal); color: var(--bg-primary); }
.faq-answer { max-height:0; overflow:hidden; transition: max-height 0.4s ease; }
.faq-answer-inner { padding:0 24px 18px; font-size:0.9rem; color: var(--text-secondary); line-height:1.8; }

/* === 面包屑导航 === */
.breadcrumb { padding:16px 0; font-size:0.85rem; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent-teal); }
.breadcrumb span { margin:0 8px; }

/* === 分类标签 === */
.tag-filter { display:flex; flex-wrap:wrap; gap:10px; justify-content:center; margin-bottom:40px; }
.tag-btn {
  padding:8px 20px; border-radius: var(--radius-xl);
  background: var(--bg-card); border:1px solid var(--border-color);
  color: var(--text-secondary); font-size:0.88rem; cursor:pointer; transition: var(--transition);
}
.tag-btn:hover, .tag-btn.active { background: var(--gradient-teal); color: var(--bg-primary); border-color: var(--accent-teal); }

/* === 排行榜 === */
.rank-list { max-width:600px; margin:0 auto; }
.rank-item {
  display:flex; align-items:center; gap:16px; padding:14px 20px;
  border-bottom:1px solid var(--border-color); transition: var(--transition);
}
.rank-item:hover { background: rgba(0,212,170,0.04); }
.rank-num {
  width:32px; height:32px; border-radius:50%; display:flex;
  align-items:center; justify-content:center; font-weight:700;
  font-size:0.85rem; background: var(--bg-card); color: var(--text-muted);
  border:1px solid var(--border-color); flex-shrink:0;
}
.rank-item:nth-child(1) .rank-num { background: var(--gradient-coral); color:#fff; border:none; }
.rank-item:nth-child(2) .rank-num { background: var(--gradient-teal); color: var(--bg-primary); border:none; }
.rank-item:nth-child(3) .rank-num { background: rgba(255,184,77,0.9); color: var(--bg-primary); border:none; }
.rank-title { flex:1; font-size:0.92rem; color: var(--text-primary); }
.rank-views { font-size:0.82rem; color: var(--accent-teal); }

/* === 创作者卡片 === */
.creator-grid { display:grid; grid-template-columns: repeat(4,1fr); gap:20px; }
.creator-card {
  padding:24px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color);
  text-align:center; transition: var(--transition);
}
.creator-card:hover { transform:translateY(-4px); box-shadow: var(--shadow-teal); border-color: var(--accent-teal); }
.creator-avatar { width:72px; height:72px; border-radius:50%; overflow:hidden; margin:0 auto 12px; border:2px solid var(--accent-teal); }
.creator-avatar img { width:100%; height:100%; object-fit:cover; }
.creator-card h4 { font-size:0.95rem; font-weight:600; color: var(--text-primary); margin-bottom:4px; }
.creator-card p { font-size:0.8rem; color: var(--text-muted); }

/* === 流程步骤 === */
.steps-grid { display:grid; grid-template-columns: repeat(5,1fr); gap:16px; }
.step-card {
  padding:24px 16px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color);
  text-align:center; transition: var(--transition);
}
.step-card:hover { transform:translateY(-4px); border-color: var(--accent-teal); }
.step-num {
  width:40px; height:40px; border-radius:50%; background: var(--gradient-teal);
  display:flex; align-items:center; justify-content:center;
  font-weight:700; color: var(--bg-primary); margin:0 auto 14px; font-size:1.1rem;
}
.step-card h4 { font-size:0.95rem; font-weight:600; color: var(--text-primary); margin-bottom:8px; }
.step-card p { font-size:0.82rem; color: var(--text-secondary); line-height:1.6; }

/* === 等级体系 === */
.level-grid { display:grid; grid-template-columns: repeat(4,1fr); gap:20px; }
.level-card {
  padding:28px 20px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color);
  text-align:center; transition: var(--transition);
}
.level-card:hover { transform:translateY(-4px); }
.level-card:nth-child(1) { border-top:3px solid #8FA3B8; }
.level-card:nth-child(2) { border-top:3px solid var(--accent-teal); }
.level-card:nth-child(3) { border-top:3px solid var(--accent-gold); }
.level-card:nth-child(4) { border-top:3px solid var(--accent-coral); }
.level-badge { font-size:2rem; margin-bottom:12px; }
.level-card h4 { font-size:1.05rem; font-weight:600; color: var(--text-primary); margin-bottom:8px; }
.level-card p { font-size:0.85rem; color: var(--text-secondary); line-height:1.6; }

/* === 直播卡片 === */
.live-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.live-card {
  border-radius: var(--radius-md); overflow:hidden;
  background: var(--gradient-card); border:1px solid var(--border-color); transition: var(--transition);
}
.live-card:hover { transform:translateY(-4px); box-shadow: var(--shadow-teal); }
.live-thumb { position:relative; aspect-ratio:16/9; overflow:hidden; }
.live-thumb img { width:100%; height:100%; object-fit:cover; }
.live-badge {
  position:absolute; top:10px; left:10px; padding:4px 12px;
  background: var(--accent-coral); border-radius:4px;
  font-size:0.72rem; color:#fff; font-weight:600; animation: live-pulse 2s infinite;
}
@keyframes live-pulse { 0%,100%{opacity:1} 50%{opacity:0.7} }
.live-info { padding:14px; }
.live-info h4 { font-size:0.92rem; font-weight:600; color: var(--text-primary); margin-bottom:4px; }
.live-info p { font-size:0.8rem; color: var(--text-muted); }

/* === 工具卡片 === */
.tool-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.tool-card {
  padding:28px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color); transition: var(--transition);
}
.tool-card:hover { transform:translateY(-4px); border-color: var(--accent-teal); box-shadow: var(--shadow-teal); }
.tool-icon {
  width:52px; height:52px; border-radius: var(--radius-sm);
  background: rgba(0,212,170,0.1); display:flex; align-items:center;
  justify-content:center; font-size:1.5rem; margin-bottom:16px;
}
.tool-card h4 { font-size:1.05rem; font-weight:600; color: var(--text-primary); margin-bottom:8px; }
.tool-card p { font-size:0.85rem; color: var(--text-secondary); line-height:1.7; }

/* === 对比表格 === */
.compare-table { width:100%; border-collapse:collapse; border-radius: var(--radius-md); overflow:hidden; margin:30px 0; }
.compare-table th {
  padding:14px 20px; background: var(--bg-card); color: var(--accent-teal);
  font-weight:600; font-size:0.9rem; text-align:left; border-bottom:2px solid var(--accent-teal);
}
.compare-table td { padding:12px 20px; border-bottom:1px solid var(--border-color); font-size:0.88rem; color: var(--text-secondary); }
.compare-table tr:hover td { background: rgba(0,212,170,0.04); }

/* === 话题标签 === */
.topic-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:20px; }
.topic-card {
  padding:20px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color); transition: var(--transition);
}
.topic-card:hover { border-color: var(--accent-coral); transform:translateY(-3px); }
.topic-card h4 { font-size:0.95rem; font-weight:600; color: var(--text-primary); margin-bottom:6px; }
.topic-card p { font-size:0.82rem; color: var(--text-muted); }
.topic-hot { color: var(--accent-coral); font-size:0.75rem; font-weight:600; }

/* === 成功故事 === */
.story-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.story-card {
  padding:24px; border-radius: var(--radius-md);
  background: var(--gradient-card); border:1px solid var(--border-color); transition: var(--transition);
}
.story-card:hover { transform:translateY(-4px); box-shadow: var(--shadow-md); }
.story-card h4 { font-size:1rem; font-weight:600; color: var(--accent-teal); margin-bottom:8px; }
.story-card p { font-size:0.88rem; color: var(--text-secondary); line-height:1.7; }

/* === 页脚 === */
.site-footer { background: var(--bg-secondary); border-top:1px solid var(--border-color); padding:60px 0 0; }
.footer-grid {
  display:grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap:40px;
  padding-bottom:40px; border-bottom:1px solid var(--border-color);
}
.footer-brand p { font-size:0.88rem; color: var(--text-muted); line-height:1.7; margin-top:16px; }
.footer-brand img { height:36px; margin-bottom:8px; }
.footer-col h5 {
  font-size:0.95rem; font-weight:600; color: var(--text-primary);
  margin-bottom:16px; padding-bottom:8px;
  border-bottom:2px solid var(--accent-teal); display:inline-block;
}
.footer-col a { display:block; padding:5px 0; font-size:0.85rem; color: var(--text-muted); transition: var(--transition); }
.footer-col a:hover { color: var(--accent-teal); padding-left:4px; }
.footer-bottom { padding:20px 0; text-align:center; font-size:0.82rem; color: var(--text-muted); }
.footer-qrcode { width:100px; height:100px; margin:10px auto; border-radius: var(--radius-sm); }

/* === 内页通用Hero === */
.page-hero {
  padding: 120px 0 50px; background: var(--gradient-hero); text-align:center; position:relative;
}
.page-hero::after {
  content:''; position:absolute; bottom:0; left:0; right:0; height:1px;
  background: linear-gradient(90deg, transparent, var(--accent-teal), transparent);
}
.page-hero h1 { font-size:2.4rem; font-weight:700; margin-bottom:14px; }
.page-hero p { font-size:1rem; color: var(--text-secondary); max-width:600px; margin:0 auto; }

/* === 内容区通用 === */
.content-section { padding:70px 0; }
.content-section:nth-child(even) { background: var(--bg-secondary); }

/* === 响应式适配 === */
@media (max-width:1024px) {
  .hero-grid { grid-template-columns:1fr; gap:40px; }
  .hero-visual { order:-1; }
  .hero-content h1 { font-size:2.4rem; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .video-grid,.services-grid,.ai-grid,.community-grid,.experts-grid,.reviews-grid { grid-template-columns: repeat(2,1fr); }
  .creator-grid { grid-template-columns: repeat(2,1fr); }
  .steps-grid { grid-template-columns: repeat(3,1fr); }
  .level-grid,.live-grid,.tool-grid,.topic-grid,.story-grid { grid-template-columns: repeat(2,1fr); }
  .footer-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width:768px) {
  .header-inner { height:58px; }
  .main-nav {
    display:none; position:fixed; top:58px; left:0; right:0;
    background: rgba(6,13,22,0.98); flex-direction:column;
    padding:20px; gap:4px; border-bottom:1px solid var(--border-color);
  }
  .main-nav.open { display:flex; }
  .main-nav a { padding:12px 16px; width:100%; }
  .nav-toggle { display:flex; }
  .hero-content h1 { font-size:2rem; }
  .hero-content h2 { font-size:1.1rem; }
  .hero-float-card { display:none; }
  .stats-grid { grid-template-columns: repeat(2,1fr); gap:20px; }
  .stat-num { font-size:1.8rem; }
  .video-grid,.services-grid,.ai-grid,.community-grid,.experts-grid,.reviews-grid,
  .creator-grid,.steps-grid,.level-grid,.live-grid,.tool-grid,.topic-grid,.story-grid { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
  .section-header h2 { font-size:1.6rem; }
  .page-hero h1 { font-size:1.8rem; }
  .hero-actions { flex-direction:column; }
  .btn-primary,.btn-outline { width:100%; justify-content:center; }
}
@media (max-width:480px) {
  .container { padding:0 16px; }
  .hero-content h1 { font-size:1.6rem; }
  .stat-num { font-size:1.5rem; }
  .stats-grid { grid-template-columns:1fr 1fr; gap:16px; }
}