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

:root {
  --primary-color: #e74c3c;
  --bg-dark: #1a1a1a;
  --bg-card: #2a2a2a;
  --text-light: #ffffff;
  --text-gray: #cccccc;
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-gray);
  background-color: var(--bg-dark);
}

body.ui-style-5 {
  --primary-color: #e50914;
  --bg-dark: #141414;
  --bg-card: #2f2f2f;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background: rgba(20, 20, 20, 0.95);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo a {
  font-size: 28px;
  font-weight: bold;
  color: var(--primary-color);
  text-decoration: none;
  letter-spacing: 1px;
}

.main-nav {
  display: flex;
  gap: 30px;
}

.main-nav a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 16px;
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav a:hover {
  color: var(--primary-color);
}

.site-main {
  min-height: calc(100vh - 200px);
  padding: 20px 0;
}

.hero-banner {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-dark) 100%);
  padding: 60px 0;
  margin-bottom: 40px;
  border-radius: var(--border-radius);
}

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

.hero-title {
  font-size: 36px;
  color: var(--text-light);
  margin-bottom: 20px;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-gray);
}

.site-intro {
  margin-bottom: 40px;
}

.intro-content {
  background: var(--bg-card);
  padding: 30px;
  border-radius: var(--border-radius);
  line-height: 1.8;
  font-size: 16px;
}

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

.module-title {
  font-size: 28px;
  color: var(--text-light);
  margin-bottom: 25px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--primary-color);
  display: inline-block;
}

.video-grid {
  display: grid;
  gap: 25px;
}

.video-grid--4col {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.video-grid--5col {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.video-grid--3col {
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.video-card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
  height: 100%;
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(229, 9, 20, 0.3);
}

.video-card__link {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.video-cover {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  background: #000;
}

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

.video-card:hover .video-cover img {
  transform: scale(1.05);
}

.play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(229, 9, 20, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.play-icon::before {
  content: '';
  width: 0;
  height: 0;
  border-left: 20px solid white;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}

.video-card:hover .play-icon {
  opacity: 1;
}

.video-info {
  padding: 15px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.video-title {
  font-size: 18px;
  color: var(--text-light);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

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

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

.module-more {
  text-align: center;
  margin-top: 30px;
}

.btn-more {
  display: inline-block;
  padding: 12px 40px;
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: var(--transition);
  font-size: 16px;
}

.btn-more:hover {
  background: #c0392b;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(229, 9, 20, 0.4);
}

.detail-page .video-player-section {
  margin-bottom: 30px;
}

.video-player {
  max-width: 1200px;
  margin: 0 auto;
}

.video-player-inner {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: #000;
  border-radius: var(--border-radius);
  overflow: hidden;
}

.player-play-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  background: rgba(229, 9, 20, 0.9);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}

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

.player-play-icon {
  font-size: 48px;
  color: white;
}

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

.video-main-title {
  font-size: 36px;
  color: var(--text-light);
  text-align: center;
}

.video-basic-info {
  background: var(--bg-card);
  padding: 30px;
  border-radius: var(--border-radius);
  margin-bottom: 30px;
}

.info-title {
  font-size: 24px;
  color: var(--text-light);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary-color);
}

.info-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 15px 20px;
  font-size: 16px;
}

.info-list dt {
  color: #999;
  font-weight: normal;
}

.info-list dd {
  color: var(--text-light);
}

.content-module .module-content {
  background: var(--bg-card);
  padding: 25px;
  border-radius: var(--border-radius);
  line-height: 1.8;
  font-size: 16px;
}

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

.tag {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(229, 9, 20, 0.2);
  color: var(--primary-color);
  border-radius: 20px;
  font-size: 14px;
  border: 1px solid var(--primary-color);
}

.list-page .page-header {
  margin-bottom: 30px;
  text-align: center;
}

.list-page h1 {
  font-size: 32px;
  color: var(--text-light);
  padding-bottom: 15px;
  border-bottom: 3px solid var(--primary-color);
  display: inline-block;
}

.page--top {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  padding: 20px;
}

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

.top-item {
  display: flex;
  gap: 20px;
  padding: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  counter-increment: top-counter;
  transition: var(--transition);
}

.top-item:hover {
  background: rgba(229, 9, 20, 0.1);
}

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

.top-rank {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: bold;
  border-radius: 8px;
}

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

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

.top-info {
  flex: 1;
}

.top-title {
  font-size: 20px;
  margin-bottom: 8px;
}

.top-title a {
  color: var(--text-light);
  text-decoration: none;
  transition: var(--transition);
}

.top-title a:hover {
  color: var(--primary-color);
}

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

.top-desc {
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.5;
}

.site-footer {
  background: var(--bg-card);
  padding: 30px 0;
  margin-top: 50px;
  text-align: center;
}

.footer-content p {
  color: #999;
  font-size: 14px;
  margin-bottom: 8px;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 24px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: #c0392b;
  transform: translateY(-3px);
}

@media (max-width: 768px) {
  .main-nav {
    gap: 15px;
    font-size: 14px;
  }

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

  .hero-subtitle {
    font-size: 16px;
  }

  .module-title {
    font-size: 22px;
  }

  .video-grid--4col,
  .video-grid--5col,
  .video-grid--3col {
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
  }

  .video-cover {
    padding-top: 50%;
  }

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

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

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

  .top-rank {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }

  .top-cover {
    width: 100px;
    height: 56px;
  }

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

@media (max-width: 480px) {
  .main-nav {
    gap: 8px;
    font-size: 12px;
  }

  .site-logo a {
    font-size: 22px;
  }

  .video-grid--4col,
  .video-grid--5col,
  .video-grid--3col {
    grid-template-columns: 1fr;
  }
}