/* ============================================
   国产 - 主样式文件
   原创设计 © 2025 国产
   域名: y48puv.cn
   ============================================ */

/* ---- CSS变量 ---- */
:root {
  --primary: #E8336D;
  --primary-dark: #C0245A;
  --primary-light: #FF6B9D;
  --secondary: #FF9A3C;
  --accent: #7C3AED;
  --bg-dark: #0F0A1E;
  --bg-card: #1A1030;
  --bg-surface: #231540;
  --text-primary: #FFFFFF;
  --text-secondary: #C4B5D4;
  --text-muted: #8B7AA0;
  --border-color: rgba(232,51,109,0.2);
  --gradient-main: linear-gradient(135deg, #E8336D 0%, #FF6B9D 50%, #FF9A3C 100%);
  --gradient-card: linear-gradient(145deg, #1A1030 0%, #231540 100%);
  --shadow-card: 0 8px 32px rgba(232,51,109,0.15);
  --shadow-hover: 0 16px 48px rgba(232,51,109,0.3);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --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-color: 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; }
input, textarea, select { font-family: inherit; }

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

/* ---- 工具类 ---- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--radius-xl);
  font-size: 15px; font-weight: 600;
  transition: var(--transition); cursor: pointer;
}
.btn-primary {
  background: var(--gradient-main); color: #fff;
  box-shadow: 0 4px 20px rgba(232,51,109,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,51,109,0.5); }
.btn-outline {
  border: 2px solid var(--primary); color: var(--primary);
  background: transparent;
}
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.badge {
  display: inline-block; padding: 3px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
}
.badge-primary { background: rgba(232,51,109,0.2); color: var(--primary-light); border: 1px solid rgba(232,51,109,0.3); }
.badge-live { background: #E8336D; color: #fff; animation: pulse-badge 1.5s infinite; }
.badge-hot { background: var(--secondary); color: #fff; }
.badge-new { background: var(--accent); color: #fff; }

@keyframes pulse-badge {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* ---- 章节标题 ---- */
.section-header { text-align: center; margin-bottom: 56px; }
.section-label {
  display: inline-block; padding: 6px 16px;
  background: rgba(232,51,109,0.1); border: 1px solid rgba(232,51,109,0.3);
  border-radius: 20px; color: var(--primary-light);
  font-size: 13px; font-weight: 600; letter-spacing: 1px;
  text-transform: uppercase; margin-bottom: 16px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800; line-height: 1.2;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 16px; color: var(--text-secondary);
  max-width: 600px; margin: 0 auto;
}
.section-divider {
  width: 60px; height: 4px;
  background: var(--gradient-main);
  border-radius: 2px; margin: 20px auto 0;
}

/* ============================================
   顶部公告栏
   ============================================ */
.top-bar {
  background: var(--gradient-main);
  padding: 8px 0; font-size: 13px;
  text-align: center; color: #fff;
}
.top-bar a { color: #fff; font-weight: 600; }
.top-bar a:hover { text-decoration: underline; }

/* ============================================
   导航栏
   ============================================ */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(15,10,30,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.site-header.scrolled { box-shadow: 0 4px 30px rgba(0,0,0,0.5); }
.header-inner {
  display: flex; align-items: center;
  justify-content: space-between;
  height: 70px; gap: 24px;
}
.site-logo {
  display: flex; align-items: center; gap: 10px;
  flex-shrink: 0;
}
.site-logo img { height: 40px; width: auto; }
.logo-text {
  font-size: 22px; font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-item {
  position: relative;
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition); white-space: nowrap;
}
.nav-item:hover, .nav-item.active {
  color: var(--text-primary);
  background: rgba(232,51,109,0.1);
}
.nav-item.active::after {
  content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 20px; height: 2px; background: var(--primary); border-radius: 1px;
}
.nav-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.nav-btn-login {
  padding: 8px 20px; border-radius: var(--radius-xl);
  border: 1px solid var(--border-color); color: var(--text-secondary);
  font-size: 14px; transition: var(--transition);
}
.nav-btn-login:hover { border-color: var(--primary); color: var(--primary); }
.nav-btn-join {
  padding: 8px 20px; border-radius: var(--radius-xl);
  background: var(--gradient-main); color: #fff;
  font-size: 14px; font-weight: 600;
  box-shadow: 0 4px 15px rgba(232,51,109,0.3);
}
.nav-btn-join:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(232,51,109,0.4); }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  padding: 8px; cursor: pointer;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--text-primary); border-radius: 1px;
  transition: var(--transition);
}

/* ============================================
   搜索框
   ============================================ */
.search-bar-wrapper {
  background: rgba(26,16,48,0.8);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}
.search-form {
  display: flex; align-items: center;
  max-width: 700px; margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden; transition: var(--transition);
}
.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232,51,109,0.15);
}
.search-input {
  flex: 1; padding: 12px 20px;
  background: transparent; border: none; outline: none;
  color: var(--text-primary); font-size: 15px;
}
.search-input::placeholder { color: var(--text-muted); }
.search-tags {
  display: flex; gap: 8px; padding: 0 12px;
  flex-wrap: nowrap; overflow: hidden;
}
.search-tag {
  padding: 4px 10px; border-radius: 12px;
  background: rgba(232,51,109,0.1); color: var(--text-muted);
  font-size: 12px; cursor: pointer; white-space: nowrap;
  transition: var(--transition);
}
.search-tag:hover { background: rgba(232,51,109,0.2); color: var(--primary-light); }
.search-btn {
  padding: 12px 24px;
  background: var(--gradient-main); color: #fff;
  font-size: 15px; font-weight: 600;
  border: none; cursor: pointer;
  transition: var(--transition);
}
.search-btn:hover { opacity: 0.9; }

/* ============================================
   英雄区
   ============================================ */
.hero {
  position: relative; overflow: hidden;
  min-height: 600px; display: flex; align-items: center;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
}
.hero-bg img {
  width: 100%; height: 100%; object-fit: cover;
  opacity: 0.35;
}
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(15,10,30,0.9) 0%, rgba(35,21,64,0.7) 50%, rgba(15,10,30,0.85) 100%);
}
.hero-content {
  position: relative; z-index: 1;
  padding: 80px 0;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 20px;
  background: rgba(232,51,109,0.15); border: 1px solid rgba(232,51,109,0.3);
  color: var(--primary-light); font-size: 13px; font-weight: 600;
  margin-bottom: 24px;
}
.hero-badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--primary); animation: pulse-badge 1.5s infinite;
}
.hero-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 900; line-height: 1.1;
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary); margin-bottom: 36px;
  max-width: 560px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats {
  display: flex; gap: 40px; flex-wrap: wrap;
}
.stat-item { display: flex; flex-direction: column; gap: 4px; }
.stat-num {
  font-size: 28px; font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 13px; color: var(--text-muted); }
.hero-visual {
  position: relative; z-index: 1;
}
.hero-video-preview {
  position: relative; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-hover);
  border: 1px solid var(--border-color);
}
.hero-video-preview img {
  width: 100%; aspect-ratio: 16/9; object-fit: cover;
}
.hero-play-btn {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 64px; height: 64px; border-radius: 50%;
  background: rgba(232,51,109,0.9);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: var(--transition);
  box-shadow: 0 0 0 0 rgba(232,51,109,0.4);
  animation: pulse-ring 2s infinite;
}
.hero-play-btn:hover { transform: translate(-50%, -50%) scale(1.1); }
.hero-play-btn svg { width: 24px; height: 24px; fill: #fff; margin-left: 4px; }

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(232,51,109,0.4); }
  70% { box-shadow: 0 0 0 20px rgba(232,51,109,0); }
  100% { box-shadow: 0 0 0 0 rgba(232,51,109,0); }
}

/* ============================================
   视频卡片
   ============================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-grid-4 { grid-template-columns: repeat(4, 1fr); }
.video-grid-3 { grid-template-columns: repeat(3, 1fr); }
.video-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden; transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232,51,109,0.4);
}
.video-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition);
}
.video-card:hover .video-overlay { opacity: 1; }
.play-btn-circle {
  width: 52px; height: 52px; border-radius: 50%;
  background: rgba(232,51,109,0.9);
  display: flex; align-items: center; justify-content: center;
  transform: scale(0.8); transition: var(--transition);
}
.video-card:hover .play-btn-circle { transform: scale(1); }
.play-btn-circle svg { width: 20px; height: 20px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75); color: #fff;
  padding: 2px 7px; border-radius: 4px; font-size: 12px; font-weight: 600;
}
.video-badge-pos {
  position: absolute; top: 8px; left: 8px;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 15px; font-weight: 600; line-height: 1.4;
  margin-bottom: 8px; color: var(--text-primary);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 13px; color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-author {
  display: flex; align-items: center; gap: 8px;
  margin-top: 10px; padding-top: 10px;
  border-top: 1px solid var(--border-color);
}
.author-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--primary);
}
.author-name { font-size: 13px; color: var(--text-secondary); }

/* ============================================
   分类导航
   ============================================ */
.category-tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 32px;
}
.category-tab {
  padding: 8px 20px; border-radius: var(--radius-xl);
  background: var(--bg-surface); border: 1px solid var(--border-color);
  color: var(--text-secondary); font-size: 14px; font-weight: 500;
  cursor: pointer; transition: var(--transition);
}
.category-tab:hover, .category-tab.active {
  background: var(--primary); border-color: var(--primary); color: #fff;
}

/* ============================================
   功能模块卡片
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px; text-align: center;
  transition: var(--transition); cursor: pointer;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(232,51,109,0.4);
}
.feature-icon {
  width: 64px; height: 64px; border-radius: var(--radius-md);
  background: rgba(232,51,109,0.1);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px; font-size: 28px;
  border: 1px solid rgba(232,51,109,0.2);
}
.feature-title {
  font-size: 18px; font-weight: 700; margin-bottom: 10px;
}
.feature-desc {
  font-size: 14px; color: var(--text-secondary); line-height: 1.6;
}

/* ============================================
   专家卡片
   ============================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden; transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.expert-cover {
  position: relative; height: 200px; overflow: hidden;
}
.expert-cover img {
  width: 100%; height: 100%; object-fit: cover;
  object-position: top;
}
.expert-cover::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 80px;
  background: linear-gradient(transparent, var(--bg-card));
}
.expert-body { padding: 20px; }
.expert-name { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: 13px; color: var(--primary-light); margin-bottom: 12px; }
.expert-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.expert-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.expert-tag {
  padding: 3px 10px; border-radius: 12px;
  background: rgba(124,58,237,0.15); color: #A78BFA;
  font-size: 12px; border: 1px solid rgba(124,58,237,0.2);
}
.expert-actions { display: flex; gap: 10px; }
.expert-btn {
  flex: 1; padding: 9px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 600; text-align: center;
  transition: var(--transition);
}
.expert-btn-primary {
  background: var(--gradient-main); color: #fff;
}
.expert-btn-secondary {
  border: 1px solid var(--border-color); color: var(--text-secondary);
}
.expert-btn-secondary:hover { border-color: var(--primary); color: var(--primary); }

/* ============================================
   评论/口碑
   ============================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px; transition: var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-card); }
.review-stars { color: #FFB800; font-size: 16px; margin-bottom: 12px; }
.review-text {
  font-size: 14px; color: var(--text-secondary);
  line-height: 1.7; margin-bottom: 16px;
}
.review-author {
  display: flex; align-items: center; gap: 12px;
}
.review-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gradient-main);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700; color: #fff; flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 600; }
.review-date { font-size: 12px; color: var(--text-muted); }

/* ============================================
   FAQ
   ============================================ */
.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;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,51,109,0.4); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; cursor: pointer;
  background: var(--gradient-card);
  font-size: 16px; font-weight: 600;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary-light); }
.faq-icon {
  width: 24px; height: 24px; border-radius: 50%;
  background: rgba(232,51,109,0.1); border: 1px solid rgba(232,51,109,0.3);
  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 {
  padding: 0 24px; max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  background: var(--bg-card);
}
.faq-item.open .faq-answer { max-height: 300px; padding: 16px 24px 20px; }
.faq-answer p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ============================================
   合作品牌
   ============================================ */
.partners-row {
  display: flex; align-items: center; justify-content: center;
  gap: 32px; flex-wrap: wrap;
}
.partner-logo {
  padding: 16px 24px;
  background: var(--bg-surface); border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-muted); font-size: 16px; font-weight: 700;
  transition: var(--transition); letter-spacing: 1px;
}
.partner-logo:hover { border-color: var(--primary); color: var(--primary-light); }

/* ============================================
   联系我们
   ============================================ */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
  align-items: start;
}
.contact-info-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 36px;
}
.contact-info-title { font-size: 22px; font-weight: 700; margin-bottom: 24px; }
.contact-item {
  display: flex; align-items: flex-start; gap: 16px;
  margin-bottom: 20px; padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}
.contact-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.contact-icon {
  width: 44px; height: 44px; border-radius: var(--radius-sm);
  background: rgba(232,51,109,0.1); border: 1px solid rgba(232,51,109,0.2);
  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: 4px; }
.contact-value { font-size: 15px; font-weight: 500; }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qr-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 20px;
  text-align: center;
}
.qr-card img { width: 140px; height: 140px; margin: 0 auto 12px; border-radius: 8px; }
.qr-label { font-size: 14px; font-weight: 600; 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); }
.share-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--radius-xl);
  font-size: 13px; font-weight: 600; transition: var(--transition);
}
.share-wechat { background: rgba(7,193,96,0.15); color: #07C160; border: 1px solid rgba(7,193,96,0.3); }
.share-weibo { background: rgba(230,22,45,0.15); color: #E6162D; border: 1px solid rgba(230,22,45,0.3); }
.share-douyin { background: rgba(0,0,0,0.3); color: #fff; border: 1px solid rgba(255,255,255,0.2); }
.share-bilibili { background: rgba(0,161,214,0.15); color: #00A1D6; border: 1px solid rgba(0,161,214,0.3); }
.share-btn:hover { transform: translateY(-2px); opacity: 0.85; }

/* ============================================
   页脚
   ============================================ */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px; margin-bottom: 48px;
}
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-desc { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-icon {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--bg-surface); border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; transition: var(--transition);
}
.social-icon:hover { background: var(--primary); border-color: var(--primary); }
.footer-col-title { font-size: 16px; font-weight: 700; margin-bottom: 20px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-link {
  font-size: 14px; color: var(--text-muted);
  transition: var(--transition);
}
.footer-link:hover { color: var(--primary-light); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-copy { font-size: 13px; color: var(--text-muted); }
.footer-copy a { color: var(--primary-light); }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-link { font-size: 13px; color: var(--text-muted); transition: var(--transition); }
.footer-bottom-link:hover { color: var(--primary-light); }

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; color: var(--text-muted);
  padding: 16px 0;
}
.breadcrumb a { color: var(--text-muted); transition: var(--transition); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb .sep { color: var(--text-muted); }
.breadcrumb .current { color: var(--text-primary); }

/* ============================================
   内页Hero
   ============================================ */
.page-hero {
  background: linear-gradient(135deg, #1A1030 0%, #231540 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 48px 0;
}
.page-hero-title { font-size: clamp(28px, 4vw, 44px); font-weight: 800; margin-bottom: 12px; }
.page-hero-desc { font-size: 16px; color: var(--text-secondary); }

/* ============================================
   加载动画
   ============================================ */
.skeleton {
  background: linear-gradient(90deg, var(--bg-surface) 25%, rgba(255,255,255,0.05) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================
   移动端菜单
   ============================================ */
.mobile-menu {
  display: none; position: fixed; inset: 0; z-index: 999;
  background: rgba(15,10,30,0.98); backdrop-filter: blur(20px);
  flex-direction: column; padding: 80px 24px 40px;
}
.mobile-menu.open { display: flex; }
.mobile-menu .nav-item {
  font-size: 20px; padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}
.mobile-menu-close {
  position: absolute; top: 20px; right: 20px;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--bg-surface); border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; cursor: pointer; color: var(--text-primary);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .video-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
}
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .main-nav { display: none; }
  .nav-actions .nav-btn-login { display: none; }
  .hamburger { display: flex; }
  .video-grid-4, .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .search-tags { display: none; }
  .hero-stats { gap: 24px; }
  .qr-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .video-grid, .video-grid-4, .video-grid-3 { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .reviews-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================
   两列布局
   ============================================ */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 768px) { .two-col { grid-template-columns: 1fr; } }

/* ============================================
   AI功能卡片
   ============================================ */
.ai-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.ai-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 28px;
  transition: var(--transition); position: relative; overflow: hidden;
}
.ai-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-main);
}
.ai-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.ai-icon { font-size: 36px; margin-bottom: 16px; }
.ai-title { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.ai-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
@media (max-width: 768px) { .ai-grid { grid-template-columns: 1fr; } }

/* ============================================
   直播卡片
   ============================================ */
.live-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px;
}
.live-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md); overflow: hidden;
  transition: var(--transition); cursor: pointer;
}
.live-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.live-thumb { position: relative; aspect-ratio: 3/4; overflow: hidden; }
.live-thumb img { width: 100%; height: 100%; object-fit: cover; }
.live-badge {
  position: absolute; top: 8px; left: 8px;
  background: #E8336D; color: #fff;
  padding: 3px 8px; border-radius: 4px;
  font-size: 11px; font-weight: 700;
  display: flex; align-items: center; gap: 4px;
}
.live-viewers {
  position: absolute; bottom: 8px; left: 8px;
  background: rgba(0,0,0,0.7); color: #fff;
  padding: 3px 8px; border-radius: 4px; font-size: 12px;
}
.live-info { padding: 12px; }
.live-name { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.live-topic { font-size: 12px; color: var(--text-muted); }

/* ============================================
   How-To 步骤
   ============================================ */
.steps-list { display: flex; flex-direction: column; gap: 20px; }
.step-item {
  display: flex; gap: 20px; align-items: flex-start;
  padding: 24px; background: var(--gradient-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-md);
  transition: var(--transition);
}
.step-item:hover { border-color: rgba(232,51,109,0.4); }
.step-num {
  width: 44px; height: 44px; border-radius: 50%; flex-shrink: 0;
  background: var(--gradient-main);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800; color: #fff;
}
.step-content { flex: 1; }
.step-title { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.step-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* ============================================
   标签云
   ============================================ */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-item {
  padding: 6px 14px; border-radius: var(--radius-xl);
  background: var(--bg-surface); border: 1px solid var(--border-color);
  color: var(--text-secondary); font-size: 13px;
  transition: var(--transition); cursor: pointer;
}
.tag-item:hover { background: rgba(232,51,109,0.1); border-color: var(--primary); color: var(--primary-light); }

/* ============================================
   分页
   ============================================ */
.pagination {
  display: flex; align-items: center; justify-content: center;
  gap: 8px; margin-top: 48px;
}
.page-btn {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: var(--bg-surface); border: 1px solid var(--border-color);
  color: var(--text-secondary); font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition); cursor: pointer;
}
.page-btn:hover, .page-btn.active {
  background: var(--primary); border-color: var(--primary); color: #fff;
}

/* ============================================
   通知条
   ============================================ */
.notice-bar {
  background: rgba(232,51,109,0.08); border: 1px solid rgba(232,51,109,0.2);
  border-radius: var(--radius-sm); padding: 12px 20px;
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 32px;
}
.notice-icon { font-size: 18px; flex-shrink: 0; }
.notice-text { font-size: 14px; color: var(--text-secondary); }
.notice-text strong { color: var(--primary-light); }