main { padding: 30px 0; min-height: calc(100vh - 200px); }

.hero { text-align: center; padding: 40px 20px; background: #fff; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.hero h1 { font-size: 28px; margin-bottom: 15px; color: #2c3e50; }
.hero .intro { font-size: 16px; color: #666; max-width: 800px; margin: 0 auto; }

.module { background: #fff; border-radius: 8px; padding: 30px; margin-bottom: 30px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.module h2 { font-size: 24px; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid #3498db; }

.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; margin-bottom: 20px; }
.video-card { background: #f9f9f9; padding: 20px; border-radius: 6px; transition: transform 0.3s, box-shadow 0.3s; }
.video-card:hover { transform: translateY(-5px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 18px; margin-bottom: 10px; }
.video-card h3 a { color: #2c3e50; }
.video-card h3 a:hover { color: #3498db; }
.video-card .meta { font-size: 13px; color: #999; margin-bottom: 10px; }
.video-card .summary { font-size: 14px; color: #666; margin-bottom: 15px; line-height: 1.6; }
.video-card .btn { display: inline-block; padding: 8px 16px; background: #3498db; color: #fff; border-radius: 4px; font-size: 14px; transition: background 0.3s; }
.video-card .btn:hover { background: #2980b9; }

.video-list { display: flex; flex-direction: column; gap: 15px; margin-bottom: 20px; }
.video-item { display: flex; align-items: center; gap: 15px; padding: 15px; background: #f9f9f9; border-radius: 6px; transition: background 0.3s; }
.video-item:hover { background: #ecf0f1; }
.video-item .rank { font-size: 24px; font-weight: bold; color: #3498db; min-width: 40px; text-align: center; }
.video-item .item-content { flex: 1; }
.video-item h3 { font-size: 16px; margin-bottom: 5px; }
.video-item h3 a { color: #2c3e50; }
.video-item h3 a:hover { color: #3498db; }
.video-item .meta { font-size: 13px; color: #999; }

.module-link { text-align: center; padding-top: 15px; }
.module-link a { color: #3498db; font-size: 15px; transition: color 0.3s; }
.module-link a:hover { color: #2980b9; text-decoration: underline; }

.quick-links { text-align: center; padding: 20px; background: #fff; border-radius: 8px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.quick-links a { color: #3498db; margin: 0 10px; }
.quick-links a:hover { text-decoration: underline; }

.page-header { text-align: center; padding: 40px 20px; background: #fff; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.page-header h1 { font-size: 28px; margin-bottom: 15px; color: #2c3e50; }
.page-header .intro { font-size: 16px; color: #666; }

.video-list-page { background: #fff; border-radius: 8px; padding: 30px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.video-item-detailed { padding: 25px 0; border-bottom: 1px solid #eee; position: relative; }
.video-item-detailed:last-child { border-bottom: none; }
.video-item-detailed .rank-badge { position: absolute; left: 0; top: 25px; font-size: 20px; font-weight: bold; color: #3498db; min-width: 50px; }
.video-item-detailed .item-main { padding-left: 60px; }
.video-item-detailed h3 { font-size: 20px; margin-bottom: 10px; }
.video-item-detailed h3 a { color: #2c3e50; }
.video-item-detailed h3 a:hover { color: #3498db; }
.video-item-detailed .meta { font-size: 14px; color: #999; margin-bottom: 10px; }
.video-item-detailed .summary { font-size: 15px; color: #666; line-height: 1.8; margin-bottom: 12px; }
.video-item-detailed .date-badge { display: inline-block; padding: 4px 10px; background: #e8f5e9; color: #2e7d32; border-radius: 4px; font-size: 13px; margin-bottom: 10px; }
.video-item-detailed .btn-link { color: #3498db; font-size: 14px; }
.video-item-detailed .btn-link:hover { text-decoration: underline; }

.detail-page { background: #fff; border-radius: 8px; padding: 40px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.detail-header h1 { font-size: 28px; color: #2c3e50; margin-bottom: 20px; padding-bottom: 15px; border-bottom: 2px solid #3498db; }

.detail-info { margin-bottom: 30px; }
.detail-info h2 { font-size: 22px; margin-bottom: 15px; color: #34495e; }
.detail-info dl { display: grid; grid-template-columns: 100px 1fr; gap: 12px; }
.detail-info dt { font-weight: bold; color: #555; }
.detail-info dd { color: #666; }

.detail-highlight { margin-bottom: 30px; padding: 20px; background: #e3f2fd; border-radius: 6px; border-left: 4px solid #2196f3; }
.detail-highlight h2 { font-size: 20px; margin-bottom: 12px; color: #1976d2; }
.detail-highlight .highlight-text { font-size: 16px; color: #555; line-height: 1.8; }

.detail-summary { margin-bottom: 30px; }
.detail-summary h2 { font-size: 22px; margin-bottom: 15px; color: #34495e; }
.detail-summary p { font-size: 15px; color: #666; line-height: 2; text-indent: 2em; }

.detail-review { margin-bottom: 30px; padding: 20px; background: #fff3e0; border-radius: 6px; border-left: 4px solid #ff9800; }
.detail-review h2 { font-size: 20px; margin-bottom: 12px; color: #e65100; }
.detail-review p { font-size: 15px; color: #555; line-height: 1.8; }

.detail-related h2 { font-size: 22px; margin-bottom: 20px; color: #34495e; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
.related-card { padding: 15px; background: #f9f9f9; border-radius: 6px; transition: transform 0.3s; }
.related-card:hover { transform: translateY(-3px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.related-card h3 { font-size: 16px; margin-bottom: 8px; }
.related-card h3 a { color: #2c3e50; }
.related-card h3 a:hover { color: #3498db; }
.related-card .related-meta { font-size: 13px; color: #999; margin-bottom: 8px; }
.related-card .related-desc { font-size: 14px; color: #666; line-height: 1.6; }

footer { background: #2c3e50; color: #ecf0f1; padding: 20px 0; text-align: center; margin-top: 40px; }
footer p { font-size: 14px; }

@media (max-width: 768px) {
  .hero h1, .page-header h1, .detail-header h1 { font-size: 22px; }
  .video-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .detail-info dl { grid-template-columns: 80px 1fr; gap: 8px; }
  .video-item-detailed .item-main { padding-left: 0; padding-top: 35px; }
  .video-item-detailed .rank-badge { top: 0; }
  .detail-page { padding: 20px; }
}