.container { max-width: 1200px; margin: 0 auto; padding: 2rem 1rem; }
.hero { text-align: center; padding: 2rem 0; background: white; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.hero h1 { font-size: 1.8rem; margin-bottom: 1rem; color: #667eea; }
.intro { font-size: 1rem; line-height: 1.8; color: #666; max-width: 900px; margin: 0 auto; }
.section { margin-bottom: 3rem; }
.section-title { font-size: 1.5rem; margin-bottom: 1.5rem; color: #333; padding-left: 0.5rem; border-left: 4px solid #667eea; }
.video-grid, .video-grid-large, .video-grid-time { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.video-card, .related-card, .video-card-time { background: white; padding: 1.5rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); transition: transform 0.3s, box-shadow 0.3s; }
.video-card:hover, .related-card:hover, .video-card-time:hover { transform: translateY(-4px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.video-card h3, .related-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: #333; }
.video-card h3 a, .related-card h3 a { color: inherit; transition: color 0.3s; }
.video-card h3 a:hover, .related-card h3 a:hover { color: #667eea; }
.meta { font-size: 0.85rem; color: #999; margin-bottom: 0.5rem; }
.tags { font-size: 0.85rem; color: #667eea; margin-bottom: 0.5rem; }
.oneline { font-size: 0.9rem; color: #666; line-height: 1.6; }
.video-list-rank { display: flex; flex-direction: column; gap: 1rem; }
.video-card-rank { background: white; padding: 1.5rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); display: flex; gap: 1.5rem; align-items: flex-start; }
.rank-num { font-size: 2rem; font-weight: bold; color: #667eea; min-width: 50px; text-align: center; }
.rank-content { flex: 1; }
.rank-content h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.time-label { display: inline-block; background: #667eea; color: white; padding: 0.2rem 0.8rem; border-radius: 4px; font-size: 0.85rem; margin-bottom: 0.5rem; }
.more-link { text-align: center; margin-top: 1.5rem; }
.more-link a { color: #667eea; font-size: 1rem; transition: color 0.3s; }
.more-link a:hover { color: #764ba2; }
.page-title { font-size: 2rem; margin-bottom: 1rem; color: #333; text-align: center; }
.page-desc { font-size: 1rem; color: #666; line-height: 1.8; margin-bottom: 2rem; text-align: center; max-width: 900px; margin-left: auto; margin-right: auto; }
.topic-group { margin-bottom: 3rem; }
.topic-title { font-size: 1.3rem; margin-bottom: 1rem; color: #667eea; }
.detail { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.detail-title { font-size: 2rem; margin-bottom: 1.5rem; color: #333; text-align: center; }
.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; margin-bottom: 1rem; color: #667eea; padding-bottom: 0.5rem; border-bottom: 2px solid #f0f0f0; }
.info-list { list-style: none; }
.info-list li { padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; }
.info-list li:last-child { border-bottom: none; }
.highlight { font-size: 1.1rem; color: #667eea; font-weight: 500; line-height: 1.8; }
.detail-summary p, .detail-review p { font-size: 1rem; line-height: 1.8; color: #555; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1.5rem; }
.footer { background: #333; color: white; text-align: center; padding: 2rem 1rem; margin-top: 3rem; }
.footer p { font-size: 0.9rem; }
.footer a { color: #667eea; transition: color 0.3s; }
.footer a:hover { color: #764ba2; }
@media (max-width: 768px) {
  .hero h1 { font-size: 1.3rem; }
  .intro { font-size: 0.9rem; }
  .video-grid, .video-grid-large, .video-grid-time { grid-template-columns: 1fr; }
  .video-card-rank { flex-direction: column; text-align: center; }
  .rank-num { font-size: 1.5rem; }
  .detail { padding: 1.5rem 1rem; }
  .detail-title { font-size: 1.5rem; }
  .related-grid { grid-template-columns: 1fr; }
}