.main-content { padding: 40px 20px; }
.container { max-width: 1200px; margin: 0 auto; background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.page-title { font-size: 28px; margin-bottom: 20px; color: #1f2937; border-bottom: 3px solid #2563eb; padding-bottom: 10px; }
.page-desc { margin-bottom: 30px; color: #6b7280; line-height: 1.8; }
.intro-section { margin-bottom: 40px; padding: 20px; background: #f9fafb; border-radius: 8px; line-height: 1.8; }
.section-title { font-size: 24px; margin: 40px 0 20px; color: #1f2937; padding-left: 12px; border-left: 4px solid #2563eb; }
.section-more { margin-top: 20px; text-align: center; padding-top: 20px; border-top: 1px solid #e5e7eb; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.video-card { padding: 20px; background: #f9fafb; border-radius: 8px; transition: transform 0.2s, box-shadow 0.2s; }
.video-card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 18px; margin-bottom: 10px; }
.video-meta { font-size: 14px; color: #6b7280; margin: 8px 0; }
.video-desc { font-size: 14px; color: #4b5563; line-height: 1.6; margin-top: 10px; }
.video-list { list-style: none; }
.video-item { padding: 20px; border-bottom: 1px solid #e5e7eb; position: relative; }
.video-item:last-child { border-bottom: none; }
.video-item h3 { font-size: 18px; margin-bottom: 10px; }
.list-top .video-item { padding-left: 60px; }
.rank-num { position: absolute; left: 20px; top: 20px; width: 32px; height: 32px; background: #2563eb; color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 14px; }
.video-list-simple { list-style: none; }
.video-item-simple { padding: 12px 0; border-bottom: 1px solid #e5e7eb; display: flex; justify-content: space-between; align-items: center; }
.video-item-simple:last-child { border-bottom: none; }
.video-year { color: #6b7280; font-size: 14px; }
.topic-links { display: flex; gap: 20px; flex-wrap: wrap; }
.topic-link { display: inline-block; padding: 12px 24px; background: #2563eb; color: #fff; border-radius: 6px; transition: background 0.2s; }
.topic-link:hover { background: #1d4ed8; text-decoration: none; }
.detail-article { line-height: 1.8; }
.detail-title { font-size: 32px; margin-bottom: 30px; color: #1f2937; }
.detail-info, .detail-oneline, .detail-summary, .detail-review, .related-section { margin-bottom: 40px; }
.detail-info h2, .detail-oneline h2, .detail-summary h2, .detail-review h2, .related-section h2 { font-size: 22px; margin-bottom: 16px; color: #1f2937; padding-left: 12px; border-left: 4px solid #2563eb; }
.info-list { list-style: none; background: #f9fafb; padding: 20px; border-radius: 8px; }
.info-list li { padding: 8px 0; border-bottom: 1px solid #e5e7eb; }
.info-list li:last-child { border-bottom: none; }
.detail-oneline p, .detail-summary p, .detail-review p { color: #374151; line-height: 1.8; }
.related-section .video-list { list-style: none; }
.related-section .video-item { padding: 16px; background: #f9fafb; border-radius: 8px; margin-bottom: 12px; }
.related-section .video-item h3 { font-size: 16px; margin-bottom: 8px; }
.video-tags { font-size: 13px; color: #6b7280; margin-top: 8px; }
@media (max-width: 768px) {
  .container { padding: 20px 15px; }
  .page-title { font-size: 22px; }
  .section-title { font-size: 20px; }
  .video-grid { grid-template-columns: 1fr; }
  .detail-title { font-size: 24px; }
}