/* UI Style 6 - Layout E - Skeleton S4 */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #f5f5f5;
}

body.ui-style-6 {
  background: #0a1929; color: #fff;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: #333;
  text-decoration: none;
}

.main-nav {
  display: flex;
  gap: 24px;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.main-nav a {
  color: #666;
  text-decoration: none;
  padding: 8px 0;
  white-space: nowrap;
  transition: color 0.3s;
}

.main-nav a:hover, .main-nav a.active {
  color: #1890ff;
}

main {
  min-height: calc(100vh - 200px);
  padding: 24px 0;
}

.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  margin-bottom: 16px;
}

.page-desc {
  color: #666;
  line-height: 1.8;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.video-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

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

.video-cover {
  position: relative;
  padding-top: 56.25%;
  background: #e8e8e8;
  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;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.video-meta {
  color: #999;
  font-size: 14px;
  margin-bottom: 8px;
}

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

.video-player-section {
  margin-bottom: 32px;
}

.video-player {
  background: #000;
  border-radius: 8px;
  overflow: hidden;
}

.video-player-inner {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
}

.player-play-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  border: none;
  cursor: pointer;
  transition: transform 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.player-play-icon {
  font-size: 32px;
  color: #333;
}

.detail-content {
  background: #fff;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 24px;
}

.detail-section {
  margin-bottom: 32px;
}

.detail-section:last-child {
  margin-bottom: 0;
}

.detail-section h2 {
  font-size: 24px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #1890ff;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.info-item {
  display: flex;
  padding: 8px 0;
}

.info-label {
  font-weight: 600;
  color: #333;
  min-width: 80px;
}

.info-value {
  color: #666;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  padding: 4px 12px;
  background: #f0f0f0;
  border-radius: 4px;
  font-size: 14px;
  color: #666;
}

.top-list__items {
  list-style: none;
  counter-reset: item;
}

.top-list__item {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  gap: 16px;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.top-list__item::before {
  counter-increment: item;
  content: counter(item);
  font-size: 24px;
  font-weight: bold;
  color: #1890ff;
  min-width: 40px;
  text-align: center;
}

.top-list__cover {
  width: 120px;
  height: 68px;
  border-radius: 4px;
  overflow: hidden;
  flex-shrink: 0;
}

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

.top-list__info {
  flex: 1;
}

.top-list__title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.top-list__meta {
  color: #999;
  font-size: 14px;
}

.related-section {
  background: #fff;
  border-radius: 8px;
  padding: 32px;
}

.related-section h2 {
  font-size: 24px;
  margin-bottom: 24px;
  padding-bottom: 8px;
  border-bottom: 2px solid #1890ff;
}

.video-card--related {
  margin-bottom: 0;
}

footer {
  background: #333;
  color: #fff;
  padding: 32px 0;
  margin-top: 48px;
}

.footer-content {
  text-align: center;
}

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: #1890ff;
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transition: opacity 0.3s;
}

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

@media (max-width: 768px) {
  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
  }

  .video-cover {
    padding-top: 75%;
  }

  .video-info {
    padding: 12px;
  }

  .video-title {
    font-size: 16px;
  }

  .detail-content {
    padding: 20px;
  }

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

  .main-nav {
    gap: 16px;
    padding-bottom: 4px;
  }

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

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

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

.site-intro {
  background: #fff;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

.site-intro p {
  line-height: 1.8;
  color: #666;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-title {
  font-size: 24px;
  font-weight: 600;
}

.section-more {
  color: #1890ff;
  text-decoration: none;
  font-size: 14px;
}

.section-more:hover {
  text-decoration: underline;
}

.filter-bar {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 24px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.filter-label {
  font-weight: 600;
  color: #333;
}

.filter-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-option {
  padding: 6px 16px;
  background: #f0f0f0;
  border-radius: 4px;
  font-size: 14px;
  color: #666;
  cursor: pointer;
  transition: all 0.3s;
}

.filter-option:hover, .filter-option.active {
  background: #1890ff;
  color: #fff;
}

.page--grouped .group {
  margin-bottom: 40px;
}

.page--grouped .group__title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 4px solid #1890ff;
}

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