body { max-width: 1200px; margin: 0 auto; padding: 0; }
.page-header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; padding: 3rem 2rem; text-align: center; margin-bottom: 2rem; }
.page-header h1 { font-size: 2rem; margin-bottom: 1rem; }
.site-intro { font-size: 1.1rem; line-height: 1.8; max-width: 900px; margin: 0 auto; }
.section { padding: 2rem; margin-bottom: 2rem; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.section h2 { font-size: 1.5rem; margin-bottom: 0.5rem; color: #2c5aa0; border-bottom: 2px solid #2c5aa0; padding-bottom: 0.5rem; }
.section-desc { color: #666; margin-bottom: 1.5rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.video-card { background: #f9f9f9; padding: 1.2rem; border-radius: 6px; transition: transform 0.2s, box-shadow 0.2s; position: relative; }
.video-card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.video-card .meta { color: #666; font-size: 0.9rem; margin-bottom: 0.5rem; }
.video-card .oneline { font-size: 0.95rem; color: #444; margin-bottom: 0.5rem; line-height: 1.5; }
.video-card .tags { font-size: 0.85rem; color: #888; }
.video-card .rank { position: absolute; top: 0.5rem; right: 0.5rem; background: #ff6b6b; color: #fff; width: 30px; height: 30px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 0.9rem; }
.topic-links { list-style: none; margin: 1.5rem 0; }
.topic-links li { margin-bottom: 0.8rem; padding-left: 1rem; border-left: 3px solid #2c5aa0; }
.topic-links a { font-size: 1.05rem; }
.detail-page { background: #fff; padding: 2rem; margin: 2rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.detail-header h1 { font-size: 2rem; color: #2c5aa0; margin-bottom: 1rem; }
.detail-info, .detail-oneline, .detail-summary, .detail-review, .detail-related { margin-bottom: 2rem; }
.detail-info h2, .detail-oneline h2, .detail-summary h2, .detail-review h2, .detail-related h2 { font-size: 1.3rem; color: #2c5aa0; margin-bottom: 1rem; border-bottom: 2px solid #e0e0e0; padding-bottom: 0.5rem; }
.info-list { list-style: none; }
.info-list li { padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; }
.detail-summary p, .detail-review p { line-height: 1.8; font-size: 1rem; text-align: justify; }
footer { background: #333; color: #fff; text-align: center; padding: 2rem; margin-top: 3rem; }
@media (max-width: 768px) {
  .page-header { padding: 2rem 1rem; }
  .page-header h1 { font-size: 1.5rem; }
  .site-intro { font-size: 1rem; }
  .section { padding: 1rem; margin: 1rem; }
  .grid { grid-template-columns: 1fr; gap: 1rem; }
  .detail-page { padding: 1rem; margin: 1rem; }
  .detail-header h1 { font-size: 1.5rem; }
}