/* ===================================
   亚博体育 Kaiyun Sports - 主样式文件
   原创设计 © 2026 亚博体育
   =================================== */

/* CSS变量 - 原创配色方案 */
:root {
  --primary: #0a3d6b;
  --primary-light: #1565a8;
  --accent: #f47c20;
  --accent-light: #ff9a45;
  --dark: #0d1117;
  --dark-card: #161b22;
  --dark-border: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --success: #2ea043;
  --live-red: #e53935;
  --gradient-primary: linear-gradient(135deg, #0a3d6b 0%, #1565a8 50%, #0d47a1 100%);
  --gradient-accent: linear-gradient(135deg, #f47c20 0%, #ff9a45 100%);
  --gradient-dark: linear-gradient(180deg, #0d1117 0%, #161b22 100%);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 32px rgba(20,100,200,0.3);
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --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', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
  background: var(--dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===================================
   头部导航
   =================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dark-border);
  transition: var(--transition);
}
.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  height: 64px;
  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: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}
.logo-text span { color: var(--accent); }

/* 导航菜单 */
.main-nav { flex: 1; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-list li a {
  display: block;
  padding: 8px 14px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-list li a:hover,
.nav-list li a.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.08);
}
.nav-live {
  display: flex;
  align-items: center;
  gap: 6px;
}
.live-dot {
  width: 8px; height: 8px;
  background: var(--live-red);
  border-radius: 50%;
  animation: livePulse 1.5s infinite;
}
@keyframes livePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}

/* 搜索框 */
.header-search {
  position: relative;
  flex-shrink: 0;
}
.search-input {
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--dark-border);
  border-radius: 20px;
  padding: 8px 40px 8px 16px;
  color: var(--text-primary);
  font-size: 0.85rem;
  width: 200px;
  outline: none;
  transition: var(--transition);
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  border-color: var(--primary-light);
  background: rgba(255,255,255,0.1);
  width: 240px;
}
.search-btn {
  position: absolute;
  right: 10px; top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
  transition: var(--transition);
}
.search-btn:hover { color: var(--accent); }

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===================================
   英雄区域
   =================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 64px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,61,107,0.88) 0%, rgba(13,17,23,0.75) 60%, rgba(13,17,23,0.95) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1400px;
  margin: 0 auto;
  padding: 80px 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(244,124,32,0.15);
  border: 1px solid rgba(244,124,32,0.3);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-title .brand { color: var(--accent); }
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-accent);
  color: #fff;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(244,124,32,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(244,124,32,0.4);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid rgba(255,255,255,0.2);
  cursor: pointer;
  transition: var(--transition);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.4);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* 英雄统计数据 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.stat-item {
  text-align: center;
  padding: 20px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--border-radius);
}
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  display: block;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* 英雄右侧视频卡片预览 */
.hero-video-preview {
  position: relative;
}
.hero-video-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.hero-video-card {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 16/9;
}
.hero-video-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.hero-video-card:hover img { transform: scale(1.05); }
.hero-video-card .play-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);
}
.hero-video-card:hover .play-overlay { opacity: 1; }
.play-icon {
  width: 50px; height: 50px;
  background: rgba(244,124,32,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
  transform: scale(0.8);
  transition: transform 0.3s ease;
}
.hero-video-card:hover .play-icon { transform: scale(1); }
.video-label {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 8px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  font-size: 0.75rem;
  color: #fff;
}

/* ===================================
   通用区域样式
   =================================== */
.section {
  padding: 80px 0;
}
.section-alt {
  background: var(--dark-card);
}
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}
.section-header {
  text-align: center;
  margin-bottom: 50px;
}
.section-tag {
  display: inline-block;
  background: rgba(244,124,32,0.12);
  color: var(--accent);
  border: 1px solid rgba(244,124,32,0.25);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title .highlight { color: var(--accent); }
.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===================================
   视频卡片 - 核心组件
   =================================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(20,100,200,0.4);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark);
}
.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(0,0,0,0.35);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-circle {
  width: 56px; height: 56px;
  background: rgba(244,124,32,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.85);
  transition: transform 0.3s ease;
  box-shadow: 0 4px 20px rgba(244,124,32,0.5);
}
.video-card:hover .play-circle { transform: scale(1); }
.play-circle::after {
  content: '';
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-live-badge {
  position: absolute;
  top: 8px; left: 8px;
  background: var(--live-red);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.video-live-badge::before {
  content: '';
  width: 6px; height: 6px;
  background: #fff;
  border-radius: 50%;
  animation: livePulse 1.5s infinite;
}
.video-info {
  padding: 14px;
}
.video-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-stats {
  display: flex;
  gap: 12px;
}
.video-stats span {
  display: flex;
  align-items: center;
  gap: 4px;
}
.video-category {
  background: rgba(20,100,200,0.15);
  color: var(--primary-light);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 0.72rem;
}

/* ===================================
   直播区域
   =================================== */
.live-section {
  background: linear-gradient(180deg, var(--dark) 0%, rgba(10,61,107,0.15) 100%);
}
.live-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}
.live-main {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
}
.live-main-img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}
.live-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent 40%, rgba(0,0,0,0.8) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
}
.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--live-red);
  color: #fff;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  width: fit-content;
  margin-bottom: 12px;
}
.live-badge::before {
  content: '';
  width: 8px; height: 8px;
  background: #fff;
  border-radius: 50%;
  animation: livePulse 1.5s infinite;
}
.live-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.live-info {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}
.live-sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.live-card-small {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  display: flex;
  gap: 12px;
  padding: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.live-card-small:hover {
  border-color: rgba(20,100,200,0.4);
  background: rgba(255,255,255,0.03);
}
.live-card-small img {
  width: 100px;
  height: 60px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}
.live-card-info { flex: 1; min-width: 0; }
.live-card-title {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.live-card-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===================================
   专家展示
   =================================== */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(20,100,200,0.4);
}
.expert-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  border: 3px solid var(--accent);
}
.expert-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.expert-role {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 12px;
}
.expert-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}
.expert-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 16px;
}
.award-tag {
  background: rgba(244,124,32,0.1);
  border: 1px solid rgba(244,124,32,0.2);
  color: var(--accent);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 20px;
}
.expert-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}
.btn-sm {
  padding: 7px 16px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.btn-sm-primary {
  background: var(--gradient-accent);
  color: #fff;
}
.btn-sm-outline {
  background: transparent;
  border: 1px solid var(--dark-border);
  color: var(--text-secondary);
}
.btn-sm-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===================================
   合作品牌Logo墙
   =================================== */
.partners-section {
  padding: 60px 0;
  background: var(--dark-card);
  border-top: 1px solid var(--dark-border);
  border-bottom: 1px solid var(--dark-border);
}
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius-sm);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: default;
}
.partner-item:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.15);
}

/* ===================================
   FAQ
   =================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  overflow: hidden;
}
.faq-question {
  padding: 18px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  user-select: none;
}
.faq-question:hover { background: rgba(255,255,255,0.03); }
.faq-icon {
  width: 24px; height: 24px;
  background: rgba(244,124,32,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 20px;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 20px 18px;
}
.faq-answer p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================
   用户评价
   =================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  padding: 22px;
  transition: var(--transition);
}
.review-card:hover {
  border-color: rgba(20,100,200,0.3);
  transform: translateY(-2px);
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.reviewer-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.reviewer-name {
  font-size: 0.9rem;
  font-weight: 600;
}
.reviewer-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.review-stars {
  color: #f5c518;
  font-size: 0.85rem;
  margin-bottom: 10px;
}
.review-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}
.review-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 10px;
}

/* ===================================
   联系我们
   =================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  padding: 30px;
}
.contact-info-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--accent);
}
.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
  align-items: flex-start;
}
.contact-icon {
  width: 36px; height: 36px;
  background: rgba(244,124,32,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-text { font-size: 0.88rem; color: var(--text-secondary); }
.contact-text strong { color: var(--text-primary); display: block; margin-bottom: 2px; }

/* 二维码区域 */
.qrcode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.qrcode-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  padding: 20px;
  text-align: center;
}
.qrcode-card img {
  width: 140px; height: 140px;
  object-fit: cover;
  border-radius: 8px;
  margin: 0 auto 12px;
}
.qrcode-label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.qrcode-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===================================
   社交分享
   =================================== */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 30px;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  color: #fff;
}
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #010101; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; }
.share-btn:hover { transform: translateY(-2px); filter: brightness(1.1); }

/* ===================================
   底部
   =================================== */
.site-footer {
  background: var(--dark-card);
  border-top: 1px solid var(--dark-border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-text {
  font-size: 1.3rem;
  margin-bottom: 12px;
  display: block;
}
.footer-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--dark-border);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copyright {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-update {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-legal {
  display: flex;
  gap: 16px;
}
.footer-legal a {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-legal a:hover { color: var(--accent); }

/* ===================================
   AI赋能模块
   =================================== */
.ai-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-feature-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.ai-feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.ai-feature-card:hover::before { opacity: 1; }
.ai-feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.ai-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}
.ai-feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.ai-feature-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================================
   社区功能
   =================================== */
.community-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.community-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
}
.community-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.community-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.community-content { padding: 20px; }
.community-tag {
  display: inline-block;
  background: rgba(20,100,200,0.15);
  color: var(--primary-light);
  border-radius: 4px;
  padding: 3px 10px;
  font-size: 0.75rem;
  margin-bottom: 10px;
}
.community-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.community-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

/* ===================================
   内页 Hero
   =================================== */
.page-hero {
  background: var(--gradient-primary);
  padding: 100px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/hero_banner.jpg') center/cover;
  opacity: 0.1;
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.page-hero p {
  font-size: 1rem;
  color: rgba(255,255,255,0.75);
  max-width: 600px;
  margin: 0 auto;
}

/* ===================================
   响应式
   =================================== */
@media (max-width: 1024px) {
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .live-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-features-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .header-search { display: none; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .experts-grid { grid-template-columns: 1fr 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .ai-features-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .qrcode-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 50px 0; }
  .hero-video-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .qrcode-grid { grid-template-columns: 1fr; }
}

/* ===================================
   移动端导航展开
   =================================== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: rgba(13,17,23,0.98);
  border-bottom: 1px solid var(--dark-border);
  z-index: 999;
  padding: 16px 20px;
}
.mobile-nav.open { display: block; }
.mobile-nav .nav-list {
  flex-direction: column;
  gap: 4px;
}
.mobile-nav .nav-list li a {
  padding: 12px 16px;
  font-size: 1rem;
}
.mobile-search {
  padding: 12px 0 0;
}
.mobile-search .search-input {
  width: 100%;
}

/* ===================================
   懒加载占位
   =================================== */
img[data-src] {
  background: var(--dark-card);
  min-height: 100px;
}

/* ===================================
   滚动条美化
   =================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--dark-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===================================
   加载动画
   =================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease forwards; }

/* ===================================
   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 {
  position: relative;
  width: 90%;
  max-width: 900px;
  background: var(--dark-card);
  border-radius: var(--border-radius);
  overflow: hidden;
}
.video-modal-close {
  position: absolute;
  top: 12px; right: 12px;
  background: rgba(0,0,0,0.6);
  border: none;
  color: #fff;
  width: 36px; height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.video-modal-close:hover { background: var(--live-red); }
.video-player-placeholder {
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  color: var(--text-secondary);
}
.video-player-placeholder .big-play {
  width: 80px; height: 80px;
  background: var(--gradient-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: #fff;
}