.site-header { text-align: center; padding: 40px 20px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border-radius: 8px; margin-bottom: 30px; }
.site-header h1 { font-size: 28px; font-weight: 700; margin-bottom: 10px; }
.site-intro { background: white; padding: 25px; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); line-height: 1.8; }
section { background: white; padding: 25px; border-radius: 8px; margin-bottom: 25px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
section h2 { font-size: 22px; margin-bottom: 15px; color: #333; border-left: 4px solid #667eea; padding-left: 12px; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; margin-top: 20px; }
.video-card { background: #f9f9f9; padding: 20px; border-radius: 6px; transition: transform 0.2s, box-shadow 0.2s; }
.video-card:hover { transform: translateY(-3px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 18px; margin-bottom: 10px; }
.video-card h3 a { color: #333; }
.video-card .brief { font-size: 14px; color: #666; margin-bottom: 10px; line-height: 1.6; }
.video-card .card-meta { font-size: 13px; color: #999; }
.video-list .list-item { border-bottom: 1px solid #eee; padding: 15px 0; }
.video-list .list-item:last-child { border-bottom: none; }
.video-list h3 { font-size: 17px; margin-bottom: 8px; }
.video-list p { font-size: 14px; color: #666; margin-bottom: 5px; }
.video-list .year { font-size: 13px; color: #999; }
.more-link { margin-top: 20px; text-align: center; }
.more-link a { color: #667eea; font-weight: 600; }
.link-group { display: flex; gap: 15px; margin-top: 15px; }
.btn { display: inline-block; padding: 10px 20px; background: #667eea; color: white; border-radius: 5px; font-weight: 600; transition: background 0.2s; }
.btn:hover { background: #5568d3; text-decoration: none; }
.detail h1 { font-size: 32px; margin-bottom: 20px; color: #333; }
.detail .meta { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 20px; padding: 15px; background: #f0f0f0; border-radius: 6px; }
.detail .meta span { font-size: 14px; }
.detail .tags { margin-bottom: 20px; }
.detail .tag { display: inline-block; background: #e0e7ff; color: #4c51bf; padding: 5px 12px; border-radius: 4px; margin-right: 8px; margin-bottom: 8px; font-size: 13px; }
.detail .one-line { padding: 15px; background: #fffbeb; border-left: 4px solid #f59e0b; margin-bottom: 20px; font-size: 16px; }
.detail .summary, .detail .review { margin-bottom: 25px; }
.detail h2 { font-size: 20px; margin-bottom: 12px; color: #333; }
.detail p { line-height: 1.8; color: #555; }
.rank-list .rank-item { display: flex; align-items: flex-start; gap: 15px; border-bottom: 1px solid #eee; padding: 15px 0; }
.rank-list .rank-item:last-child { border-bottom: none; }
.rank-num { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: #667eea; color: white; border-radius: 50%; font-weight: 700; font-size: 18px; flex-shrink: 0; }
.rank-content { flex: 1; }
.rank-content h3 { font-size: 18px; margin-bottom: 8px; }
.rank-content p { font-size: 14px; color: #666; margin-bottom: 5px; }
.rank-content .meta { font-size: 13px; color: #999; }
.topic-group { margin-bottom: 30px; }
.latest-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.latest-card { background: #f9f9f9; padding: 20px; border-radius: 6px; position: relative; }
.date-badge { position: absolute; top: 10px; right: 10px; background: #667eea; color: white; padding: 4px 10px; border-radius: 4px; font-size: 12px; font-weight: 600; }
.latest-card h3 { font-size: 18px; margin-bottom: 10px; padding-right: 60px; }
.latest-card p { font-size: 14px; color: #666; margin-bottom: 10px; }
.latest-card .meta { font-size: 13px; color: #999; }
@media (max-width: 768px) {
  .site-header h1 { font-size: 22px; }
  .video-grid, .latest-grid { grid-template-columns: 1fr; }
  .detail h1 { font-size: 26px; }
  .detail .meta { flex-direction: column; gap: 10px; }
  .link-group { flex-direction: column; }
}