body {
  font-family: 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(to bottom, #f8f9fa 0%, #e9ecef 100%);
  color: #2c3e50;
  line-height: 1.8;
  min-height: 100vh;
}

.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 30px 20px;
}

.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 60px 40px;
  border-radius: 12px;
  margin-bottom: 40px;
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.main-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.site-intro {
  font-size: 18px;
  line-height: 1.6;
  opacity: 0.95;
  max-width: 900px;
}

.content-section {
  background: white;
  padding: 40px;
  margin-bottom: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: transform 0.3s, box-shadow 0.3s;
}

.content-section:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.12);
}

.section-title {
  font-size: 28px;
  font-weight: 600;
  color: #667eea;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 3px solid #667eea;
}

.section-desc {
  color: #666;
  margin-bottom: 25px;
  font-size: 15px;
}

.section-desc a {
  color: #667eea;
  text-decoration: underline;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
  margin-top: 20px;
}

.video-card {
  background: linear-gradient(to bottom, #ffffff 0%, #f8f9fa 100%);
  border: 1px solid #e9ecef;
  border-radius: 10px;
  padding: 20px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.video-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.video-card:hover::before {
  transform: scaleX(1);
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.2);
  border-color: #667eea;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 10px;
  transition: color 0.3s;
}

.video-card:hover .card-title {
  color: #667eea;
}

.card-meta {
  font-size: 13px;
  color: #6c757d;
  margin-bottom: 10px;
}

.card-desc {
  font-size: 14px;
  color: #495057;
  line-height: 1.6;
}

.video-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 20px;
}

.list-item {
  display: flex;
  align-items: center;
  padding: 15px;
  background: #f8f9fa;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.list-item:hover {
  background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
  color: white;
  transform: translateX(5px);
}

.rank-num {
  font-size: 24px;
  font-weight: 700;
  color: #667eea;
  margin-right: 20px;
  min-width: 40px;
  text-align: center;
}

.list-item:hover .rank-num {
  color: white;
}

.item-link {
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

.item-meta {
  font-size: 13px;
  color: #6c757d;
}

.list-item:hover .item-meta {
  color: rgba(255, 255, 255, 0.9);
}

.video-grid-small {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.small-card {
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 15px;
  transition: all 0.3s ease;
}

.small-card:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
  border-color: #667eea;
}

.small-card h4 {
  font-size: 16px;
  color: #2c3e50;
  margin-bottom: 8px;
}

.small-card p {
  font-size: 13px;
  color: #6c757d;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: #2c3e50;
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 4px solid #667eea;
}

.page-intro {
  font-size: 16px;
  color: #495057;
  margin-bottom: 30px;
  line-height: 1.8;
}

.list-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
}

.list-card {
  background: white;
  border: 1px solid #dee2e6;
  border-radius: 10px;
  padding: 25px;
  transition: all 0.3s ease;
}

.list-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
  border-color: #667eea;
}

.list-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 12px;
}

.list-card .meta {
  font-size: 13px;
  color: #6c757d;
  margin-bottom: 10px;
}

.list-card .desc {
  font-size: 15px;
  color: #495057;
  line-height: 1.6;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.rank-item {
  display: flex;
  align-items: flex-start;
  background: white;
  border: 2px solid #e9ecef;
  border-radius: 10px;
  padding: 20px;
  transition: all 0.3s ease;
}

.rank-item:hover {
  border-color: #667eea;
  box-shadow: 0 5px 20px rgba(102, 126, 234, 0.15);
}

.rank-number {
  font-size: 36px;
  font-weight: 700;
  color: #667eea;
  min-width: 60px;
  text-align: center;
  margin-right: 20px;
}

.rank-content {
  flex: 1;
}

.rank-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 10px;
}

.rank-content .meta {
  font-size: 13px;
  color: #6c757d;
  margin-bottom: 8px;
}

.rank-content .review {
  font-size: 15px;
  color: #495057;
  line-height: 1.6;
}

.topic-section {
  margin-bottom: 40px;
}

.topic-title {
  font-size: 24px;
  font-weight: 600;
  color: #667eea;
  margin-bottom: 20px;
  padding-left: 15px;
  border-left: 5px solid #667eea;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.topic-card {
  background: white;
  border: 1px solid #dee2e6;
  border-radius: 8px;
  padding: 20px;
  transition: all 0.3s ease;
}

.topic-card:hover {
  transform: scale(1.03);
  box-shadow: 0 6px 18px rgba(102, 126, 234, 0.2);
  border-color: #667eea;
}

.topic-card h4 {
  font-size: 17px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 8px;
}

.topic-card p {
  font-size: 13px;
  color: #6c757d;
}

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

.latest-card {
  background: white;
  border: 1px solid #dee2e6;
  border-radius: 10px;
  padding: 20px;
  position: relative;
  transition: all 0.3s ease;
}

.latest-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.2);
  border-color: #667eea;
}

.year-tag {
  position: absolute;
  top: 15px;
  right: 15px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.latest-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 10px;
  padding-right: 70px;
}

.latest-card .meta {
  font-size: 13px;
  color: #6c757d;
  margin-bottom: 10px;
}

.latest-card .desc {
  font-size: 14px;
  color: #495057;
  line-height: 1.6;
}

.detail-page {
  background: white;
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.detail-title {
  font-size: 32px;
  font-weight: 700;
  color: #2c3e50;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 4px solid #667eea;
}

.detail-article section {
  margin-bottom: 35px;
}

.detail-article h2 {
  font-size: 22px;
  font-weight: 600;
  color: #667eea;
  margin-bottom: 15px;
  padding-left: 12px;
  border-left: 4px solid #667eea;
}

.info-list {
  list-style: none;
  padding: 0;
}

.info-list li {
  padding: 10px 0;
  border-bottom: 1px solid #e9ecef;
  font-size: 15px;
  line-height: 1.6;
}

.info-list li:last-child {
  border-bottom: none;
}

.info-list strong {
  color: #495057;
  margin-right: 10px;
}

.highlight-text,
.summary-text,
.review-text {
  font-size: 16px;
  line-height: 1.8;
  color: #495057;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 8px;
  border-left: 4px solid #667eea;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.related-card {
  background: linear-gradient(to bottom, #ffffff 0%, #f8f9fa 100%);
  border: 1px solid #dee2e6;
  border-radius: 8px;
  padding: 18px;
  transition: all 0.3s ease;
}

.related-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 18px rgba(102, 126, 234, 0.15);
  border-color: #667eea;
}

.related-card h4 {
  font-size: 17px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 8px;
}

.related-meta {
  font-size: 13px;
  color: #6c757d;
  margin-bottom: 8px;
}

.related-desc {
  font-size: 14px;
  color: #495057;
  line-height: 1.6;
}

.site-footer {
  background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
  color: white;
  padding: 30px 20px;
  text-align: center;
  margin-top: 50px;
}

.footer-content p {
  margin: 0;
  font-size: 14px;
  opacity: 0.9;
}

@media (max-width: 768px) {
  .main-container {
    padding: 20px 15px;
  }

  .hero-section {
    padding: 40px 20px;
  }

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

  .site-intro {
    font-size: 16px;
  }

  .content-section {
    padding: 25px 20px;
  }

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

  .video-grid,
  .video-grid-small {
    grid-template-columns: 1fr;
  }

  .list-container,
  .latest-grid,
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }

  .detail-page {
    padding: 25px 20px;
  }

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

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

  .rank-number {
    font-size: 28px;
    min-width: 50px;
  }
}

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

  .site-intro {
    font-size: 14px;
  }

  .rank-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .rank-number {
    margin-right: 0;
    margin-bottom: 10px;
  }
}