/* ========================================
   福利导航 - 汽车改装视频社区 全局样式
   bdbocp.cn © 2025 福利导航
   ======================================== */

/* CSS变量定义 */
:root {
  --primary: #ff6b35;
  --primary-dark: #e85520;
  --secondary: #0a0e1a;
  --accent: #00d4ff;
  --accent2: #7c3aed;
  --bg-dark: #0d1117;
  --bg-card: #161b27;
  --bg-card2: #1e2535;
  --text-primary: #f0f4ff;
  --text-secondary: #8b9ab5;
  --text-muted: #5a6a82;
  --border: #252d3d;
  --border-light: #2e3a50;
  --gradient-primary: linear-gradient(135deg, #ff6b35 0%, #e85520 100%);
  --gradient-accent: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
  --gradient-dark: linear-gradient(180deg, #0a0e1a 0%, #0d1117 100%);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 40px rgba(255,107,53,0.2);
  --radius: 12px;
  --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;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* 干扰标签隐藏 */
.KtJIOcIV { display: none !important; }

/* ========== 顶部公告栏 ========== */
.top-bar {
  background: linear-gradient(90deg, var(--secondary) 0%, #1a1f35 100%);
  border-bottom: 1px solid var(--border);
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-secondary);
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar a { color: var(--accent); }
.top-bar a:hover { color: var(--primary); }

/* ========== 头部导航 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.site-logo img { height: 48px; width: auto; }
.logo-text { display: flex; flex-direction: column; }
.logo-name {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.logo-slogan { font-size: 11px; color: var(--text-muted); letter-spacing: 1px; }

/* 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-secondary);
  white-space: nowrap;
  position: relative;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary);
  background: rgba(255,107,53,0.08);
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

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

/* ========== 搜索框 ========== */
.search-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-inner {
  display: flex;
  align-items: center;
  max-width: 680px;
  margin: 0 auto;
  background: var(--bg-card2);
  border: 1px solid var(--border-light);
  border-radius: 40px;
  overflow: hidden;
  transition: var(--transition);
}
.search-inner:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,107,53,0.15);
}
.search-inner input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text-primary);
  font-family: inherit;
}
.search-inner input::placeholder { color: var(--text-muted); }
.search-btn {
  padding: 10px 24px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: 0 40px 40px 0;
  transition: var(--transition);
}
.search-btn:hover { opacity: 0.9; }

/* ========== 容器 ========== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 20px; }

/* ========== 面包屑 ========== */
.breadcrumb {
  padding: 12px 0;
  font-size: 13px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ========== 英雄区域 ========== */
.hero-section {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.4);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,14,26,0.9) 0%, rgba(255,107,53,0.1) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,107,53,0.15);
  border: 1px solid rgba(255,107,53,0.3);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero-title .highlight {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 560px;
  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;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255,107,53,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,107,53,0.5); }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border: 2px solid var(--border-light);
  color: var(--text-primary);
  border-radius: 40px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: rgba(255,107,53,0.05); }
.hero-stats {
  position: absolute;
  bottom: 40px;
  right: 0;
  display: flex;
  gap: 32px;
  z-index: 2;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ========== 区块通用 ========== */
.section { padding: 64px 0; }
.section-sm { padding: 40px 0; }
.section-header { margin-bottom: 40px; }
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}
.section-tag::before {
  content: '';
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}
.section-title {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
}
.section-title .hl { color: var(--primary); }
.section-desc { color: var(--text-secondary); font-size: 15px; max-width: 560px; line-height: 1.8; }
.section-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
}
.view-all {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.view-all:hover { gap: 10px; }

/* ========== 视频卡片 ========== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-grid-4 { grid-template-columns: repeat(4, 1fr); }
.video-grid-3 { grid-template-columns: repeat(3, 1fr); }
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-card2);
}
.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); }
.video-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 .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,107,53,0.9);
  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 svg { width: 22px; height: 22px; fill: #fff; margin-left: 3px; }
.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;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 700;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text-primary);
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-stats {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}
.video-stats span { display: flex; align-items: center; gap: 4px; }
.video-stats .hot { color: var(--primary); }

/* ========== 特色卡片 ========== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition);
}
.feature-card:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 18px;
}
.feature-icon.orange { background: rgba(255,107,53,0.15); }
.feature-icon.cyan { background: rgba(0,212,255,0.15); }
.feature-icon.purple { background: rgba(124,58,237,0.15); }
.feature-title { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.feature-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ========== 专家展示 ========== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover { border-color: var(--accent); box-shadow: 0 8px 40px rgba(0,212,255,0.15); transform: translateY(-4px); }
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  border: 3px solid var(--border-light);
  overflow: hidden;
  background: var(--bg-card2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}
.expert-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: 12px; color: var(--primary); font-weight: 600; margin-bottom: 10px; }
.expert-desc { font-size: 13px; color: var(--text-secondary); 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(255,107,53,0.1);
  border: 1px solid rgba(255,107,53,0.2);
  color: var(--primary);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
}
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm.primary { background: var(--gradient-primary); color: #fff; }
.btn-sm.ghost { border: 1px solid var(--border-light); color: var(--text-secondary); }
.btn-sm.ghost:hover { border-color: var(--primary); color: var(--primary); }

/* ========== 合作品牌 ========== */
.brand-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.brand-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 72px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  transition: var(--transition);
  letter-spacing: 1px;
}
.brand-item:hover { border-color: var(--primary); color: var(--primary); background: rgba(255,107,53,0.05); }

/* ========== FAQ ========== */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--primary); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  gap: 16px;
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255,107,53,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  color: var(--primary);
  font-size: 16px;
  font-weight: 700;
}
.faq-item.open .faq-icon { background: var(--primary); color: #fff; transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.faq-item.open .faq-answer { display: block; }

/* ========== 评论 ========== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: var(--transition);
}
.review-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.review-stars { color: #fbbf24; font-size: 14px; margin-bottom: 10px; letter-spacing: 2px; }
.review-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 14px; }
.review-user { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 13px; font-weight: 700; }
.review-date { font-size: 11px; color: var(--text-muted); }

/* ========== 社区加入指南 ========== */
.join-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.join-steps::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 0;
}
.step-item {
  text-align: center;
  position: relative;
  z-index: 1;
}
.step-num {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-card2);
  border: 3px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  margin: 0 auto 16px;
  position: relative;
  z-index: 2;
  background: var(--bg-dark);
}
.step-title { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ========== 联系信息 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255,107,53,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--text-muted); margin-bottom: 3px; }
.contact-value { font-size: 15px; font-weight: 600; }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qr-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
}
.qr-code {
  width: 140px;
  height: 140px;
  margin: 0 auto 12px;
  background: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.qr-code canvas { width: 100%; height: 100%; }
.qr-label { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.qr-sub { 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); 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;
  transition: var(--transition);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.share-btn:hover { transform: translateY(-2px); }
.share-btn.wechat:hover { border-color: #07c160; color: #07c160; background: rgba(7,193,96,0.08); }
.share-btn.weibo:hover { border-color: #e6162d; color: #e6162d; background: rgba(230,22,45,0.08); }
.share-btn.douyin:hover { border-color: #fe2c55; color: #fe2c55; background: rgba(254,44,85,0.08); }
.share-btn.bilibili:hover { border-color: #00a1d6; color: #00a1d6; background: rgba(0,161,214,0.08); }

/* ========== AI赋能区域 ========== */
.ai-section { background: linear-gradient(135deg, rgba(124,58,237,0.08) 0%, rgba(0,212,255,0.05) 100%); }
.ai-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.ai-features { display: flex; flex-direction: column; gap: 16px; }
.ai-feature-item {
  display: flex;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  transition: var(--transition);
}
.ai-feature-item:hover { border-color: var(--accent); }
.ai-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(0,212,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.ai-feature-title { font-size: 15px; font-weight: 700; margin-bottom: 5px; }
.ai-feature-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ========== 底部 ========== */
.site-footer {
  background: var(--secondary);
  border-top: 1px solid var(--border);
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}
.footer-brand .logo-name { font-size: 22px; margin-bottom: 12px; display: block; }
.footer-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}
.social-icon:hover { border-color: var(--primary); background: rgba(255,107,53,0.1); }
.footer-col h4 { font-size: 14px; font-weight: 700; margin-bottom: 16px; color: var(--text-primary); }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 13px; color: var(--text-secondary); }
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }
.update-time { color: var(--text-muted); font-size: 12px; }

/* ========== 标签云 ========== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  padding: 5px 12px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 12px;
  color: var(--text-secondary);
  transition: var(--transition);
}
.tag-item:hover { border-color: var(--primary); color: var(--primary); background: rgba(255,107,53,0.05); }

/* ========== 视频模态框 ========== */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.9);
  align-items: center;
  justify-content: center;
}
.video-modal.active { display: flex; }
.modal-inner {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  cursor: pointer;
}
.modal-video { aspect-ratio: 16/9; background: #000; width: 100%; }
.modal-video video { width: 100%; height: 100%; }
.modal-info { padding: 20px; }
.modal-title { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.modal-desc { font-size: 14px; color: var(--text-secondary); }

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

/* ========== 响应式 ========== */
@media (max-width: 1100px) {
  .video-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .brand-wall { grid-template-columns: repeat(4, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid-4, .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
  .join-steps::before { display: none; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-stats { position: static; margin-top: 32px; }
}
@media (max-width: 768px) {
  .main-nav { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg-dark); border-bottom: 1px solid var(--border); padding: 12px 20px; }
  .main-nav.open { display: flex; }
  .menu-toggle { display: flex; }
  .site-header { position: relative; }
  .video-grid-4, .video-grid-3, .video-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .brand-wall { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 40px 0; }
  .hero-section { min-height: 420px; }
  .qr-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .video-grid, .video-grid-4, .video-grid-3 { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .join-steps { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .brand-wall { grid-template-columns: repeat(2, 1fr); }
}

/* ========== 动画 ========== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.fade-in { animation: fadeInUp 0.5s ease forwards; }
.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(255,59,48,0.15);
  border: 1px solid rgba(255,59,48,0.3);
  color: #ff3b30;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
}
.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #ff3b30;
  animation: pulse 1.5s infinite;
}

/* ========== 分类标签栏 ========== */
.category-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}
.category-tabs::-webkit-scrollbar { display: none; }
.cat-tab {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
}
.cat-tab:hover, .cat-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ========== 内页横幅 ========== */
.page-banner {
  background: linear-gradient(135deg, var(--secondary) 0%, #1a1f35 100%);
  border-bottom: 1px solid var(--border);
  padding: 48px 0;
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,107,53,0.08) 0%, transparent 70%);
}
.page-banner-title { font-size: clamp(28px, 4vw, 42px); font-weight: 800; margin-bottom: 10px; }
.page-banner-desc { font-size: 15px; color: var(--text-secondary); max-width: 500px; }

/* ========== 侧边栏 ========== */
.sidebar-layout { display: grid; grid-template-columns: 1fr 300px; gap: 32px; align-items: start; }
.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin-bottom: 20px;
}
.widget-title { font-size: 15px; font-weight: 700; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.hot-list { display: flex; flex-direction: column; gap: 12px; }
.hot-item { display: flex; gap: 12px; align-items: flex-start; }
.hot-rank {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--bg-card2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--text-muted);
}
.hot-rank.top { background: var(--primary); color: #fff; }
.hot-title { font-size: 13px; line-height: 1.5; color: var(--text-secondary); }
.hot-title:hover { color: var(--primary); }
@media (max-width: 900px) { .sidebar-layout { grid-template-columns: 1fr; } }

/* ========== 社区分区 ========== */
.community-zones {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.zone-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}
.zone-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.zone-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  flex-shrink: 0;
}
.zone-info { flex: 1; }
.zone-title { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.zone-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.5; margin-bottom: 8px; }
.zone-stats { font-size: 12px; color: var(--text-muted); display: flex; gap: 8px; align-items: center; }
.zone-arrow { font-size: 20px; color: var(--text-muted); transition: var(--transition); }
.zone-card:hover .zone-arrow { color: var(--primary); transform: translateX(4px); }

/* ========== 合作品牌墙 ========== */
.brand-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
}
.brand-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 12px;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 1px;
  transition: var(--transition);
}
.brand-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255,107,53,0.05);
}

/* ========== 加入社区步骤 ========== */
.join-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.join-steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 0;
}
.step-item {
  text-align: center;
  position: relative;
  z-index: 1;
}
.step-num {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 22px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 8px 24px rgba(255,107,53,0.3);
}
.step-title { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ========== 用户评价 ========== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.review-stars { color: #fbbf24; font-size: 16px; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.review-user { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.review-name { font-size: 13px; font-weight: 600; }
.review-date { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ========== 二维码区域 ========== */
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qr-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.qr-code {
  width: 100px;
  height: 100px;
  background: repeating-linear-gradient(45deg, var(--border) 0, var(--border) 2px, transparent 0, transparent 50%) 0 / 8px 8px,
              repeating-linear-gradient(-45deg, var(--border) 0, var(--border) 2px, transparent 0, transparent 50%) 0 / 8px 8px,
              var(--bg-card2);
  border-radius: 8px;
  margin: 0 auto 10px;
  border: 2px solid var(--border-light);
}
.qr-label { font-size: 13px; font-weight: 600; }
.qr-sub { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

/* ========== 社交分享 ========== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-secondary); }
.share-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-card);
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); }

/* ========== 标签云 ========== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: var(--transition);
}
.tag-item:hover { border-color: var(--primary); color: var(--primary); background: rgba(255,107,53,0.05); }

/* ========== AI赋能区域 ========== */
.ai-section { background: linear-gradient(135deg, rgba(124,58,237,0.08) 0%, rgba(0,212,255,0.05) 100%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.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; }
.ai-icon { font-size: 28px; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--bg-card); border-radius: 12px; flex-shrink: 0; }
.ai-feature-title { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.ai-feature-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ========== 分类标签栏 ========== */
.category-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 8px 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.category-tabs::-webkit-scrollbar { display: none; }
.cat-tab {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: transparent;
  transition: var(--transition);
}
.cat-tab:hover, .cat-tab.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

/* ========== 联系信息 ========== */
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-item { display: flex; gap: 14px; align-items: flex-start; }
.contact-icon { font-size: 20px; width: 40px; height: 40px; background: var(--bg-card); border-radius: 10px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact-label { font-size: 12px; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 14px; font-weight: 600; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }

/* ========== 隐私政策/条款页面 ========== */
.policy-content {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
}
.policy-content h2 { font-size: 20px; font-weight: 700; margin: 32px 0 12px; color: var(--primary); }
.policy-content h3 { font-size: 16px; font-weight: 700; margin: 24px 0 8px; }
.policy-content p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px; }
.policy-content ul { padding-left: 20px; margin-bottom: 12px; }
.policy-content ul li { font-size: 14px; color: var(--text-secondary); line-height: 1.8; list-style: disc; }

/* ========== 网站地图页面 ========== */
.sitemap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sitemap-section h3 { font-size: 15px; font-weight: 700; margin-bottom: 12px; color: var(--primary); padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.sitemap-section a { display: block; font-size: 13px; color: var(--text-secondary); padding: 4px 0; transition: var(--transition); }
.sitemap-section a:hover { color: var(--primary); padding-left: 8px; }

/* ========== 响应式补充 ========== */
@media (max-width: 1100px) {
  .community-zones { grid-template-columns: 1fr; }
  .brand-wall { grid-template-columns: repeat(4, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
  .join-steps::before { display: none; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .sitemap-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .reviews-grid { grid-template-columns: 1fr; }
  .brand-wall { grid-template-columns: repeat(3, 1fr); }
  .qr-grid { grid-template-columns: 1fr; }
  .join-steps { grid-template-columns: 1fr; }
  .brand-wall { grid-template-columns: repeat(2, 1fr); }
  .sitemap-grid { grid-template-columns: repeat(2, 1fr); }
  .policy-content { padding: 24px; }
}
@media (max-width: 480px) {
  .community-zones { grid-template-columns: 1fr; }
  .zone-card { flex-direction: column; text-align: center; }
  .sitemap-grid { grid-template-columns: 1fr; }
}