/* ============================================
   呦呦视频 - 主样式文件 style.css
   品牌色：深紫 #7C3AED | 橙 #F97316 | 暗背景 #0F0A1E
   ============================================ */

/* ---- CSS变量 ---- */
:root {
  --primary: #7C3AED;
  --primary-light: #A78BFA;
  --primary-dark: #5B21B6;
  --accent: #F97316;
  --accent-light: #FED7AA;
  --bg-body: #0F0A1E;
  --bg-section: #160D2E;
  --bg-card: #1E1340;
  --border: rgba(124,58,237,0.2);
  --text-primary: #F1F0FF;
  --text-secondary: #C4B5FD;
  --text-muted: #7C6FA0;
  --shadow: 0 4px 24px rgba(124,58,237,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s ease;
  --font: 'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: var(--font); }
input, textarea, select { font-family: var(--font); outline: none; }
input:focus, textarea:focus, select:focus { border-color: var(--primary) !important; }

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

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: linear-gradient(90deg, #4C1D95, #7C3AED, #4C1D95);
  padding: 8px 0;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.9);
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.top-bar-notice { display: flex; align-items: center; gap: 6px; }
.notice-icon { font-size: 0.9rem; }
.top-bar-links { display: flex; gap: 16px; }
.top-bar-links a { color: rgba(255,255,255,0.8); font-size: 0.75rem; }
.top-bar-links a:hover { color: #fff; }

/* ---- 主头部 ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15,10,30,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

/* Logo */
.site-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.site-logo img { width: 40px; height: 40px; border-radius: 10px; object-fit: contain; }
.logo-text {
  font-size: 1.3rem;
  font-weight: 800;
  background: linear-gradient(135deg, #A78BFA, #F97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: rgba(124,58,237,0.15);
  color: var(--primary-light);
}

/* 头部操作按钮 */
.header-actions { display: flex; align-items: center; gap: 8px; }
.btn-login {
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.btn-login:hover { border-color: var(--primary); color: var(--primary-light); }
.btn-register {
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.82rem;
  background: var(--primary);
  color: #fff;
  transition: all var(--transition);
}
.btn-register:hover { background: var(--primary-dark); }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 6px; border-radius: 6px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: all 0.3s; }

/* ---- 搜索栏 ---- */
.search-bar-wrapper {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-bar-inner { max-width: 700px; margin: 0 auto; padding: 0 20px; }
.search-form { display: flex; gap: 0; margin-bottom: 8px; }
.search-input {
  flex: 1;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-right: none;
  border-radius: 8px 0 0 8px;
  color: var(--text-primary);
  font-size: 0.88rem;
}
.search-input::placeholder { color: var(--text-muted); }
.search-btn {
  padding: 10px 20px;
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  border-radius: 0 8px 8px 0;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background var(--transition);
  white-space: nowrap;
}
.search-btn:hover { background: var(--primary-dark); }
.search-hot-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 0.78rem; color: var(--text-muted); }
.search-hot-tags a {
  color: var(--text-muted);
  background: rgba(124,58,237,0.1);
  padding: 2px 10px;
  border-radius: 10px;
  border: 1px solid rgba(124,58,237,0.2);
  transition: all var(--transition);
}
.search-hot-tags a:hover { background: rgba(124,58,237,0.25); color: var(--primary-light); }

/* ---- 通用按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 24px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
  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(-1px); }
.btn-outline {
  background: transparent;
  color: var(--primary-light);
  border-color: var(--primary);
}
.btn-outline:hover { background: rgba(124,58,237,0.15); color: var(--primary-light); }

/* ---- 通用Section ---- */
.section { padding: 64px 0; }

/* ---- Section头部 ---- */
.section-header { text-align: center; margin-bottom: 40px; }
.section-title {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}
.section-subtitle { font-size: 0.95rem; color: var(--text-muted); max-width: 560px; margin: 0 auto; }

/* ---- Hero区域 ---- */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 60px 0;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.25; }
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,10,30,0.85) 0%, rgba(76,29,149,0.6) 50%, rgba(15,10,30,0.85) 100%);
}
.hero .container { position: relative; z-index: 1; }
.hero-content { max-width: 680px; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(124,58,237,0.2);
  border: 1px solid rgba(124,58,237,0.4);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--primary-light);
  margin-bottom: 20px;
}
.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(239,68,68,0.2);
  color: #FCA5A5;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.75rem;
}
.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #EF4444;
  animation: pulse 1.5s infinite;
}
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.3)} }

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 18px;
  background: linear-gradient(135deg, #F1F0FF 0%, #C4B5FD 50%, #F97316 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc { font-size: 1rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 36px; }
.hero-stats { display: flex; gap: 28px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.stat-num { display: block; font-size: 1.5rem; font-weight: 800; color: var(--primary-light); }
.stat-label { font-size: 0.75rem; color: var(--text-muted); }

/* ---- 视频网格 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
}
.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: var(--bg-section);
}
.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); }

/* 播放按钮 */
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.45); }
.play-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(124,58,237,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(124,58,237,0.5);
}
.video-card:hover .play-icon { opacity: 1; 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: 0.72rem;
  padding: 2px 7px;
  border-radius: 5px;
  font-weight: 600;
}
.video-tags { position: absolute; top: 8px; left: 8px; display: flex; gap: 4px; }
.video-info { padding: 12px; }
.video-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.video-stats { display: flex; gap: 10px; }

/* ---- 徽章 ---- */
.badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 5px;
  text-transform: uppercase;
}
.badge-hot { background: #EF4444; color: #fff; }
.badge-new { background: #10B981; color: #fff; }

/* ---- 标签 ---- */
.tag {
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
  display: inline-block;
}
.tag-purple { background: rgba(124,58,237,0.15); color: var(--primary-light); border: 1px solid rgba(124,58,237,0.3); }
.tag-orange { background: rgba(249,115,22,0.15); color: #FDBA74; border: 1px solid rgba(249,115,22,0.3); }

/* ---- 功能卡片 ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}
.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.feature-icon { font-size: 2.2rem; margin-bottom: 14px; }
.feature-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.feature-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }

/* ---- AI功能列表 ---- */
.ai-features-list { display: flex; flex-direction: column; gap: 14px; }
.ai-feature-item { display: flex; gap: 14px; align-items: flex-start; }
.ai-icon { font-size: 1.4rem; min-width: 32px; }
.ai-feature-item h4 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 3px; }
.ai-feature-item p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* ---- 社区网格 ---- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.community-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
}
.community-item:hover { border-color: var(--primary); transform: translateY(-3px); }
.community-icon { font-size: 2rem; margin-bottom: 10px; }
.community-name { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.community-desc { font-size: 0.78rem; color: var(--text-secondary); margin-bottom: 8px; line-height: 1.5; }
.community-count { font-size: 0.75rem; color: var(--primary-light); }

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow); }
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 3px solid rgba(124,58,237,0.4);
}
.expert-name { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.expert-role { font-size: 0.78rem; color: var(--primary-light); margin-bottom: 10px; }
.expert-desc { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 12px; }
.expert-awards { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; margin-bottom: 14px; }
.expert-actions { display: flex; gap: 8px; justify-content: center; }

/* ---- 合作伙伴 ---- */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 12px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
  transition: all var(--transition);
}
.partner-item:hover { border-color: var(--primary); color: var(--primary-light); }

/* ---- How-To步骤 ---- */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.howto-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 18px;
  text-align: center;
  position: relative;
}
.step-num {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-icon { font-size: 1.8rem; margin-bottom: 10px; margin-top: 8px; }
.step-title { font-size: 0.92rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.step-desc { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.6; }

/* ---- 联系卡片 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}
.contact-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.qr-img { width: 100px; height: 100px; border-radius: 10px; margin: 0 auto 14px; border: 2px solid rgba(124,58,237,0.3); }
.contact-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.contact-info { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 4px; }

/* ---- 评价卡片 ---- */
.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: all var(--transition);
}
.review-card:hover { border-color: var(--primary); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.review-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user-info .name { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); }
.review-user-info .date { font-size: 0.75rem; color: var(--text-muted); }
.review-stars { color: #F59E0B; font-size: 0.9rem; margin-bottom: 8px; }
.review-text { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 10px; }
.review-tags { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: background var(--transition);
  gap: 12px;
}
.faq-question:hover { background: rgba(124,58,237,0.08); }
.faq-question.active { background: rgba(124,58,237,0.12); color: var(--primary-light); }
.faq-icon { font-size: 1.2rem; font-weight: 300; color: var(--primary-light); flex-shrink: 0; transition: transform 0.3s; }
.faq-question.active .faq-icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-answer.show { max-height: 300px; }
.faq-answer p { padding: 0 20px 16px; font-size: 0.86rem; color: var(--text-secondary); line-height: 1.8; }

/* ---- 统计数据 ---- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
  text-align: center;
}
.stat-item { padding: 20px; }
.stat-item .num {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}
.stat-item .label { font-size: 0.82rem; color: var(--text-muted); }

/* ---- 分享按钮 ---- */
.share-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.share-label { font-size: 0.85rem; color: var(--text-muted); }
.share-btn {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--transition);
  text-decoration: none;
}
.share-btn:hover { border-color: var(--primary); color: var(--primary-light); background: rgba(124,58,237,0.1); }

/* ---- 筛选按钮 ---- */
.filter-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 28px; }
.filter-label { font-size: 0.85rem; color: var(--text-muted); }
.filter-btn {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: transparent;
  transition: all var(--transition);
  cursor: pointer;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ---- 分页 ---- */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 32px; flex-wrap: wrap; }
.page-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition);
}
.page-btn:hover, .page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---- 面包屑 ---- */
.breadcrumb {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.breadcrumb ol { display: flex; align-items: center; gap: 8px; font-size: 0.8rem; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; color: var(--text-muted); }
.breadcrumb li::after { content: '›'; color: var(--text-muted); }
.breadcrumb li:last-child::after { display: none; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb .current { color: var(--primary-light); }

/* ---- 页面Hero（内页） ---- */
.page-hero {
  background: linear-gradient(135deg, #1E1340 0%, #4C1D95 50%, #1E1340 100%);
  padding: 48px 0;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.page-hero p { font-size: 0.95rem; color: var(--text-secondary); }

/* ---- 关键词高亮 ---- */
.kw { color: var(--primary-light); font-weight: 700; }

/* ---- 底部 ---- */
.site-footer {
  background: #080514;
  border-top: 1px solid var(--border);
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
.footer-brand p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; }
.footer-logo { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.footer-logo img { width: 36px; height: 36px; border-radius: 8px; }
.footer-logo-text {
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, #A78BFA, #F97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-social { display: flex; gap: 8px; flex-wrap: wrap; }
.footer-social a {
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: all var(--transition);
}
.footer-social a:hover { border-color: var(--primary); color: var(--primary-light); }
.footer-col h4 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 14px; }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col a { font-size: 0.82rem; color: var(--text-muted); }
.footer-col a:hover { color: var(--primary-light); }
.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;
}
.footer-copyright p { font-size: 0.78rem; color: var(--text-muted); }
.footer-copyright a { color: var(--text-muted); }
.footer-copyright a:hover { color: var(--primary-light); }
.footer-update { font-size: 0.78rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 0.78rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--primary-light); }

/* ---- 回到顶部 ---- */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(124,58,237,0.4);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 999;
  cursor: pointer;
  border: none;
}
.back-to-top.show { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-2px); }

/* ---- 懒加载 ---- */
img[data-src] { opacity: 0; transition: opacity 0.4s; }
img.loaded { opacity: 1; }

/* ---- 响应式：平板 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .entertainment-layout,
  .ai-layout,
  .about-layout,
  .mission-layout { grid-template-columns: 1fr !important; }
}

@media (max-width: 768px) {
  .section { padding: 40px 0; }
  .section-title { font-size: 1.5rem; }

  /* 导航隐藏 */
  .main-nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15,10,30,0.98);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
    gap: 4px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; font-size: 0.95rem; border-radius: 8px; }
  .hamburger { display: flex; }
  .btn-login, .btn-register { display: none; }

  /* 搜索栏 */
  .top-bar-links { display: none; }

  /* Hero */
  .hero { min-height: 400px; padding: 40px 0; }
  .hero-stats { gap: 16px; }
  .stat-num { font-size: 1.2rem; }

  /* 视频网格 */
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }

  /* 底部 */
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }

  /* 技能布局 */
  .skills-layout { grid-template-columns: 1fr !important; }
}

@media (max-width: 480px) {
  .container { padding: 0 14px; }
  .section-title { font-size: 1.3rem; }
  .hero-title { font-size: 1.8rem; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .search-form { flex-direction: column; }
  .search-input { border-right: 1px solid var(--border); border-radius: 8px; }
  .search-btn { border-radius: 8px; }
}

/* ---- 底部二维码行 ---- */
.footer-qr-row {
  display: flex;
  gap: 24px;
  justify-content: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.footer-qr-item { text-align: center; }
.footer-qr-item img {
  width: 90px; height: 90px;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin: 0 auto 8px;
}
.footer-qr-item p { font-size: 0.72rem; color: var(--text-muted); }

/* ---- 底部分享行 ---- */
.footer-share-row {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: center;
}

/* ---- SEO文本双列布局 ---- */
.seo-text-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 768px) { .seo-text-layout { grid-template-columns: 1fr !important; } }

/* ---- 生活技能三列布局 ---- */
.skills-layout { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 900px) { .skills-layout { grid-template-columns: 1fr 1fr !important; } }
@media (max-width: 600px) { .skills-layout { grid-template-columns: 1fr !important; } }

/* ---- 娱乐/AI双列布局 ---- */
.entertainment-layout,
.ai-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
@media (max-width: 900px) {
  .entertainment-layout,
  .ai-layout { grid-template-columns: 1fr !important; }
  .entertainment-layout > div:first-child,
  .ai-layout > div:first-child { order: 2; }
  .entertainment-layout > div:last-child,
  .ai-layout > div:last-child { order: 1; }
}

/* ---- 打印样式 ---- */
@media print {
  .site-header, .search-bar-wrapper, .back-to-top, .top-bar { display: none; }
  body { background: #fff; color: #000; }
}