body { font-size: 16px; }
.container { max-width: 1200px; }
h1 { font-size: 2rem; margin: 2rem 0 1rem; color: #2c3e50; }
h2 { font-size: 1.5rem; margin: 1.5rem 0 1rem; color: #34495e; border-bottom: 2px solid #3498db; padding-bottom: 0.5rem; }
h3 { font-size: 1.2rem; margin: 1rem 0 0.5rem; }
.site-intro, .page-intro { background: white; padding: 1.5rem; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 2px 4px rgba(0,0,0,0.1); line-height: 1.8; }
section { margin-bottom: 3rem; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; margin-top: 1rem; }
.video-card { background: white; padding: 1.5rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.3s, box-shadow 0.3s; }
.video-card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.video-card h3 { margin-top: 0; font-size: 1.1rem; }
.video-meta { color: #7f8c8d; font-size: 0.9rem; margin: 0.5rem 0; }
.video-desc { line-height: 1.6; color: #555; }
.video-list { background: white; padding: 1.5rem; border-radius: 8px; }
.video-item { padding: 1rem 0; border-bottom: 1px solid #eee; }
.video-item:last-child { border-bottom: none; }
.video-list-full .video-card-full { background: white; padding: 1.5rem; margin-bottom: 1.5rem; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.08); }
.video-highlight { font-weight: 600; color: #2980b9; margin: 0.5rem 0; }
.video-summary { color: #555; line-height: 1.7; }
.video-ranking .video-rank-item { display: flex; gap: 1rem; background: white; padding: 1.5rem; margin-bottom: 1rem; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.08); }
.rank-number { font-size: 2rem; font-weight: bold; color: #3498db; min-width: 50px; text-align: center; }
.rank-content { flex: 1; }
.video-review-short { font-style: italic; color: #7f8c8d; margin-top: 0.5rem; }
.topic-group { background: #f9f9f9; padding: 1.5rem; border-radius: 8px; margin-bottom: 2rem; }
.video-timeline .video-timeline-item { display: flex; gap: 1.5rem; background: white; padding: 1.5rem; margin-bottom: 1rem; border-radius: 8px; border-left: 4px solid #3498db; }
.timeline-date { font-weight: bold; color: #3498db; min-width: 60px; }
.timeline-content { flex: 1; }
.video-detail { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.video-info ul { list-style: none; padding: 0; }
.video-info li { padding: 0.5rem 0; border-bottom: 1px solid #eee; }
.video-info li:last-child { border-bottom: none; }
.related-videos { margin-top: 3rem; padding-top: 2rem; border-top: 2px solid #eee; }
@media (max-width: 768px) {
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.3rem; }
  .video-grid { grid-template-columns: 1fr; gap: 1rem; }
  .video-ranking .video-rank-item { flex-direction: column; text-align: center; }
  .video-timeline .video-timeline-item { flex-direction: column; }
}