/* 溏心vlog视频社区 - 主样式文件 */
/* hnxbkw.cn */
/* 原创赛博朋克机械风格设计 */

:root {
  --primary: #FF5722;
  --primary-dark: #E64A19;
  --primary-light: #FF8A65;
  --accent: #00E5FF;
  --accent-dark: #00B8D4;
  --bg-dark: #0D0D0D;
  --bg-card: #1A1A1A;
  --bg-card2: #222222;
  --bg-section: #141414;
  --text-main: #F0F0F0;
  --text-sub: #AAAAAA;
  --text-muted: #666666;
  --border: #2A2A2A;
  --border-accent: #FF5722;
  --shadow: 0 4px 24px rgba(255,87,34,0.15);
  --shadow-blue: 0 4px 24px rgba(0,229,255,0.1);
  --radius: 10px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg-dark);
  color: var(--text-main);
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }

/* ===== 隐藏干扰标签 ===== */
.n8rYfFu { display: none !important; visibility: hidden !important; }

/* ===== 顶部信息栏 ===== */
.topbar {
  background: linear-gradient(90deg, #0D0D0D 0%, #1A1A1A 50%, #0D0D0D 100%);
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
  font-size: 0.82rem;
  color: var(--text-sub);
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.topbar-left { display: flex; align-items: center; gap: 16px; }
.topbar-badge {
  background: var(--primary);
  color: #fff;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.topbar-right a { color: var(--text-sub); font-size: 0.82rem; }
.topbar-right a:hover { color: var(--primary); }

/* ===== 主导航 ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,13,13,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 20px;
}
.logo-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}
.logo-text-block { display: flex; flex-direction: column; }
.logo-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
  line-height: 1.2;
}
.logo-sub {
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.5px;
  opacity: 0.8;
}
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.nav a {
  color: var(--text-main);
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}
.nav a:hover, .nav a.active {
  color: var(--primary);
  background: rgba(255,87,34,0.1);
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  transition: var(--transition);
}

/* ===== 搜索栏 ===== */
.search-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.search-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  max-width: 600px;
  transition: var(--transition);
}
.search-wrap:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(255,87,34,0.15); }
.search-wrap input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 16px;
  color: var(--text-main);
  font-size: 0.9rem;
}
.search-wrap input::placeholder { color: var(--text-muted); }
.search-wrap button {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 10px 18px;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
}
.search-wrap button:hover { background: var(--primary-dark); }
.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.search-tag {
  background: rgba(255,87,34,0.08);
  border: 1px solid rgba(255,87,34,0.2);
  color: var(--primary-light);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-sub);
}
.breadcrumb-inner a { color: var(--text-sub); }
.breadcrumb-inner a:hover { color: var(--primary); }

/* ===== 公告栏 ===== */
.notice-bar {
  background: linear-gradient(90deg, rgba(255,87,34,0.15) 0%, rgba(0,229,255,0.08) 100%);
  border-left: 3px solid var(--primary);
  padding: 10px 20px;
  font-size: 0.85rem;
  color: var(--text-sub);
  overflow: hidden;
  white-space: nowrap;
}
.notice-bar strong { color: var(--primary); }

/* ===== Banner / Hero ===== */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.35);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,13,13,0.7) 0%, rgba(255,87,34,0.1) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 0;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,87,34,0.15);
  border: 1px solid rgba(255,87,34,0.4);
  color: var(--primary-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  color: #fff;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero h1 .highlight { color: var(--primary); }
.hero h1 .highlight-blue { color: var(--accent); }
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}
.hero-stat-label { font-size: 0.78rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,87,34,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--text-main);
  border-color: var(--border);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255,87,34,0.05);
}
.btn-accent {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  font-weight: 700;
}
.btn-accent:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #000;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,229,255,0.3);
}
.btn-ghost {
  background: rgba(255,255,255,0.05);
  color: var(--text-sub);
  border-color: var(--border);
  font-size: 0.82rem;
  padding: 8px 18px;
}
.btn-ghost:hover { background: rgba(255,87,34,0.1); color: var(--primary); border-color: var(--primary); }

/* ===== 通用 Section ===== */
.section { padding: 70px 0; }
.section-alt { background: var(--bg-section); }
.section-dark { background: #0A0A0A; }
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  margin-top: 8px;
}
.section-subtitle {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 40px;
  margin-top: 4px;
}
.section-header { margin-bottom: 40px; }

/* ===== 视频卡片网格 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #111;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.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(0,0,0,0.45); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,87,34,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: var(--transition);
}
.play-icon::after {
  content: '';
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-sub);
  margin-bottom: 8px;
}
.video-stats {
  display: flex;
  gap: 14px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== 功能模块卡片 ===== */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}
.module-card:hover { border-color: var(--primary); transform: translateY(-3px); box-shadow: var(--shadow); }
.module-card:hover::before { opacity: 1; }
.module-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
  display: block;
}
.module-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--text-main); margin-bottom: 10px; }
.module-card p { font-size: 0.88rem; color: var(--text-sub); line-height: 1.7; }

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.expert-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-3px); }
.expert-photo { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.expert-info { padding: 20px; }
.expert-name { font-size: 1.1rem; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
.expert-title { font-size: 0.82rem; color: var(--primary); margin-bottom: 10px; font-weight: 600; }
.expert-desc { font-size: 0.85rem; color: var(--text-sub); line-height: 1.6; margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.award-tag {
  background: rgba(255,87,34,0.1);
  border: 1px solid rgba(255,87,34,0.2);
  color: var(--primary-light);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 4px;
}
.expert-btns { display: flex; gap: 8px; }

/* ===== 统计数据 ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 24px;
  text-align: center;
}
.stat-item {
  padding: 24px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  transition: var(--transition);
}
.stat-item:hover { border-color: var(--primary); }
.stat-num {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary);
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { font-size: 0.82rem; color: var(--text-sub); }

/* ===== 用户评价 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  position: relative;
}
.review-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 4rem;
  color: rgba(255,87,34,0.1);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.review-stars { color: #FFB300; font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: 0.9rem; color: var(--text-sub); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 0.9rem; font-weight: 700; color: var(--text-main); }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ===== FAQ ===== */
.faq-list { max-width: 860px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(255,87,34,0.3); }
.faq-q {
  padding: 18px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
  user-select: none;
}
.faq-q::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--primary);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-q::after { content: '−'; }
.faq-a {
  display: none;
  padding: 16px 24px 20px;
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.8;
  background: var(--bg-section);
  border-top: 1px solid var(--border);
}
.faq-item.open .faq-a { display: block; }

/* ===== 合作品牌 ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.partner-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  transition: var(--transition);
}
.partner-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.partner-logo { font-size: 2rem; margin-bottom: 8px; }
.partner-name { font-size: 0.82rem; color: var(--text-sub); font-weight: 600; }

/* ===== 特色行（图文） ===== */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }
.feature-img img { border-radius: var(--radius-lg); width: 100%; box-shadow: var(--shadow); }
.feature-text h3 { font-size: 1.4rem; font-weight: 800; color: var(--text-main); margin-bottom: 14px; }
.feature-text p { color: var(--text-sub); line-height: 1.8; margin-bottom: 16px; font-size: 0.95rem; }
.feature-list { list-style: none; margin-bottom: 20px; }
.feature-list li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-sub);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  border-bottom: 1px solid var(--border);
}
.feature-list li::before { content: '▶'; color: var(--primary); font-size: 0.7rem; margin-top: 4px; flex-shrink: 0; }

/* ===== 标签云 ===== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  transition: var(--transition);
  text-decoration: none;
}
.tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 分享按钮 ===== */
.share-bar { display: flex; gap: 10px; flex-wrap: wrap; }
.share-btn {
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #000; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* ===== 视频弹窗 ===== */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 680px;
  width: 90%;
  position: relative;
  border: 1px solid var(--border);
  text-align: center;
}
.video-modal-close {
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--text-sub);
  line-height: 1;
}
.video-modal-close:hover { color: var(--primary); }
.video-placeholder {
  background: #111;
  border-radius: var(--radius);
  padding: 48px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}
.play-big {
  font-size: 4rem;
  color: var(--primary);
  margin-bottom: 16px;
  cursor: pointer;
  transition: var(--transition);
}
.play-big:hover { transform: scale(1.1); }

/* ===== Footer ===== */
.footer {
  background: #0A0A0A;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-logo img { width: 36px; height: 36px; object-fit: contain; }
.footer-logo-text { font-size: 1.1rem; font-weight: 800; color: var(--primary); }
.footer-desc { font-size: 0.85rem; color: var(--text-sub); line-height: 1.8; margin-bottom: 20px; }
.footer-col h4 { font-size: 0.95rem; font-weight: 700; color: var(--text-main); margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.85rem; color: var(--text-sub); }
.footer-col ul li a:hover { color: var(--primary); }
.footer-social { display: flex; gap: 10px; flex-wrap: wrap; }
.footer-social a {
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-sub);
  transition: var(--transition);
}
.footer-social a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.qr-section { display: flex; gap: 20px; margin-bottom: 16px; }
.qr-item { text-align: center; }
.qr-item img { width: 90px; height: 90px; border-radius: 8px; border: 1px solid var(--border); }
.qr-label { font-size: 0.72rem; color: var(--text-muted); margin-top: 6px; }
.footer-tags { margin-bottom: 32px; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }

/* ===== 回到顶部 ===== */
#backTop {
  display: none;
  position: fixed;
  bottom: 30px;
  right: 24px;
  width: 46px;
  height: 46px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 999;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(255,87,34,0.4);
  transition: var(--transition);
}
#backTop:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 28px; }
  .feature-row.reverse { direction: ltr; }
}
@media (max-width: 768px) {
  .nav { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: rgba(13,13,13,0.98); padding: 16px; border-bottom: 1px solid var(--border); }
  .nav.open { display: flex; }
  .nav-toggle { display: flex; }
  .header-inner { position: relative; }
  .hero { min-height: 420px; }
  .hero h1 { font-size: 1.8rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .video-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .hero-stats { gap: 16px; }
  .hero-stat-num { font-size: 1.4rem; }
}
@media (max-width: 480px) {
  .module-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .btn { padding: 10px 20px; font-size: 0.85rem; }
}