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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
}

.ui-style-14 {
  background-color: #fff;
  color: #333;
}

.main-nav {
  background: #fff;
  border-bottom: 1px solid #e0e0e0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-logo {
  font-size: 24px;
  font-weight: 600;
  color: #2563eb;
  text-decoration: none;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links li {
  flex-shrink: 0;
}

.nav-links a {
  display: block;
  padding: 8px 16px;
  color: #666;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.2s;
  white-space: nowrap;
  font-size: 14px;
}

.nav-links a:hover,
.nav-links a.active {
  color: #2563eb;
  background: #eff6ff;
}

.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 20px;
  min-height: calc(100vh - 200px);
}

.hero-section {
  text-align: center;
  padding: 60px 20px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 12px;
  margin-bottom: 60px;
  color: #fff;
}

.hero-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.4;
}

.hero-desc {
  font-size: 16px;
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
  opacity: 0.95;
}

.group-section {
  margin-bottom: 60px;
}

.section-title,
.group-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 30px;
  color: #111;
  position: relative;
  padding-left: 16px;
}

.section-title::before,
.group-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 28px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 2px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-grid.masonry {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: all 0.3s;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.video-card__link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.video-cover {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: #f0f0f0;
  overflow: hidden;
}

.video-cover img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-info {
  padding: 16px;
}

.video-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: #111;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.video-one-line {
  font-size: 14px;
  color: #666;
  margin-bottom: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.video-meta {
  display: flex;
  gap: 12px;
  font-size: 13px;
  color: #999;
}

.meta-item {
  display: inline-block;
}

.page-header {
  text-align: center;
  padding: 40px 20px;
  margin-bottom: 40px;
}

.page-header h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  color: #111;
}

.page-desc {
  font-size: 16px;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

.top-list__items {
  list-style: none;
}

.top-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background: #fff;
  padding: 16px;
  margin-bottom: 16px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: all 0.3s;
}

.top-item:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.top-rank {
  font-size: 32px;
  font-weight: 700;
  color: #667eea;
  min-width: 50px;
  text-align: center;
}

.top-item__link {
  display: flex;
  align-items: center;
  gap: 20px;
  text-decoration: none;
  color: inherit;
  flex: 1;
}

.top-cover {
  width: 120px;
  height: 68px;
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
}

.top-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.top-info {
  flex: 1;
}

.top-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: #111;
}

.top-desc {
  font-size: 14px;
  color: #666;
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.top-meta {
  font-size: 13px;
  color: #999;
}

.group {
  margin-bottom: 60px;
}

.group__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.detail-page {
  max-width: 1000px;
}

.video-player-section {
  margin-bottom: 40px;
}

.video-player {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.video-player-inner {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.player-play-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: rgba(255,255,255,0.95);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.player-play-btn:hover {
  transform: translate(-50%, -50%) scale(1.1);
  background: #fff;
}

.player-play-icon {
  font-size: 32px;
  color: #667eea;
  margin-left: 4px;
}

.detail-header {
  margin-bottom: 30px;
}

.detail-header h1 {
  font-size: 32px;
  font-weight: 700;
  color: #111;
}

.detail-module {
  background: #fff;
  padding: 30px;
  margin-bottom: 24px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.detail-module h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 16px;
  color: #111;
}

.detail-module p {
  font-size: 15px;
  line-height: 1.8;
  color: #444;
}

.info-list {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 12px 20px;
}

.info-list dt {
  font-weight: 600;
  color: #666;
}

.info-list dd {
  color: #333;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag {
  display: inline-block;
  padding: 6px 16px;
  background: #eff6ff;
  color: #2563eb;
  border-radius: 20px;
  font-size: 14px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

.video-card--related {
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

.site-footer {
  background: #fff;
  border-top: 1px solid #e0e0e0;
  padding: 30px 20px;
  text-align: center;
  color: #666;
  font-size: 14px;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: #667eea;
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 24px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transition: all 0.3s;
  z-index: 99;
}

.back-to-top:hover {
  background: #5568d3;
  transform: translateY(-2px);
}

.back-to-top.show {
  display: flex;
}

@media (max-width: 768px) {
  .nav-container {
    height: auto;
    min-height: 60px;
    padding: 10px 15px;
  }

  .nav-links {
    gap: 4px;
  }

  .nav-links a {
    padding: 6px 12px;
    font-size: 13px;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-desc {
    font-size: 14px;
  }

  .video-grid,
  .video-grid.masonry,
  .group__grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
  }

  .video-cover {
    padding-top: 66.67%;
  }

  .video-info {
    padding: 12px;
  }

  .video-title {
    font-size: 15px;
  }

  .video-one-line {
    font-size: 13px;
    -webkit-line-clamp: 1;
  }

  .section-title,
  .group-title {
    font-size: 22px;
  }

  .page-header h1 {
    font-size: 28px;
  }

  .top-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-rank {
    font-size: 24px;
    min-width: auto;
  }

  .top-item__link {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }

  .top-cover {
    width: 100%;
    height: auto;
    padding-top: 56.25%;
    position: relative;
  }

  .top-cover img {
    position: absolute;
    top: 0;
    left: 0;
  }

  .detail-module {
    padding: 20px;
  }

  .detail-module h2 {
    font-size: 20px;
  }

  .info-list {
    grid-template-columns: 80px 1fr;
    gap: 10px 12px;
  }

  .related-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
  }

  .back-to-top {
    width: 45px;
    height: 45px;
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .site-logo {
    font-size: 20px;
  }

  .nav-links a {
    padding: 6px 10px;
    font-size: 12px;
  }

  .hero-section {
    padding: 40px 15px;
  }

  .main-content {
    padding: 30px 15px;
  }
}