* {
  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;
}

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

.site-header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.site-logo a {
  font-size: 24px;
  font-weight: 700;
  color: #FF6700;
  text-decoration: none;
}

.main-nav {
  display: flex;
  gap: 25px;
  white-space: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.main-nav a {
  color: #333;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.main-nav a:hover {
  color: #FF6700;
}

.main-content {
  padding: 40px 0;
}

.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  padding: 60px 0;
  margin-bottom: 40px;
  border-radius: 12px;
}

.hero-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
}

.intro-section {
  margin-bottom: 50px;
}

.intro-text {
  font-size: 16px;
  line-height: 1.8;
  color: #666;
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.content-section {
  margin-bottom: 50px;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 25px;
  color: #333;
  position: relative;
  padding-left: 15px;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 24px;
  background: #FF6700;
  border-radius: 2px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
}

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

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

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

.video-cover {
  width: 100%;
  padding-top: 140%;
  position: relative;
  overflow: hidden;
  background: #e0e0e0;
}

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

.video-info {
  padding: 15px;
}

.video-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: #333;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.video-meta {
  font-size: 13px;
  color: #999;
  margin-bottom: 8px;
}

.video-one-line {
  font-size: 14px;
  color: #666;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

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

.video-player {
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.video-player-inner {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: #000;
}

.player-play-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255, 103, 0, 0.9);
  border: none;
  cursor: pointer;
  transition: all 0.3s;
}

.player-play-btn:hover {
  background: rgba(255, 103, 0, 1);
  transform: translate(-50%, -50%) scale(1.1);
}

.player-play-icon {
  font-size: 36px;
  color: #fff;
}

.video-detail-section {
  background: #fff;
  padding: 40px 0;
  border-radius: 8px;
}

.video-detail-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 30px;
  color: #333;
}

.video-basic-info,
.video-highlight,
.video-summary,
.video-review,
.video-related {
  margin-bottom: 35px;
}

.info-section-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 15px;
  color: #333;
  padding-bottom: 10px;
  border-bottom: 2px solid #f0f0f0;
}

.info-list {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 12px 20px;
  font-size: 15px;
}

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

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

.video-highlight p,
.video-summary p,
.video-review p {
  font-size: 16px;
  line-height: 1.8;
  color: #555;
}

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

.page-header {
  margin-bottom: 40px;
  padding: 30px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.page-header h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 10px;
  color: #333;
}

.page-header p {
  font-size: 16px;
  color: #666;
}

.page--top .top-list__items {
  list-style: none;
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.top-list__item {
  display: flex;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid #f0f0f0;
  gap: 20px;
}

.top-list__item:last-child {
  border-bottom: none;
}

.top-rank {
  font-size: 28px;
  font-weight: 700;
  color: #FF6700;
  min-width: 40px;
  text-align: center;
}

.top-cover {
  width: 100px;
  height: 140px;
  flex-shrink: 0;
  border-radius: 4px;
  overflow: hidden;
  background: #e0e0e0;
}

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

.top-info {
  flex: 1;
}

.top-info .video-title a {
  font-size: 20px;
  font-weight: 600;
  color: #333;
  text-decoration: none;
}

.top-info .video-title a:hover {
  color: #FF6700;
}

.site-footer {
  background: #333;
  color: #fff;
  padding: 30px 0;
  text-align: center;
  margin-top: 60px;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #FF6700;
  color: #fff;
  border: none;
  font-size: 24px;
  cursor: pointer;
  display: none;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  transition: all 0.3s;
  z-index: 999;
}

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

.back-to-top:hover {
  background: #E65A00;
  transform: translateY(-3px);
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 24px;
  }

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
  }

  .video-cover {
    padding-top: 140%;
  }

  .video-info {
    padding: 12px;
  }

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

  .main-nav {
    gap: 15px;
    font-size: 14px;
  }

  .video-detail-title {
    font-size: 26px;
  }

  .top-list__item {
    flex-wrap: wrap;
  }

  .top-cover {
    width: 80px;
    height: 112px;
  }
}

body.ui-style-3 .site-logo a {
  color: #ff7299;
}

body.ui-style-3 .main-nav a:hover {
  color: #ff7299;
}

body.ui-style-3 .section-title::before {
  background: #ff7299;
}

body.ui-style-3 .player-play-btn {
  background: rgba(255, 114, 153, 0.9);
}

body.ui-style-3 .player-play-btn:hover {
  background: rgba(255, 114, 153, 1);
}

body.ui-style-3 .back-to-top {
  background: #ff7299;
}

body.ui-style-3 .back-to-top:hover {
  background: #e65280;
}

body.ui-style-3 .top-rank {
  color: #ff7299;
}

body.ui-style-3 .top-info .video-title a:hover {
  color: #ff7299;
}