.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.hero { text-align: center; padding: 40px 20px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; border-radius: 8px; margin-bottom: 30px; }
.hero h1 { font-size: 2rem; margin-bottom: 15px; }
.hero .subtitle { font-size: 1.1rem; opacity: 0.95; }
.intro { background: #fff; padding: 30px; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.intro h2 { margin-bottom: 15px; color: #333; }
.intro p { margin-bottom: 10px; line-height: 1.8; }
section { margin-bottom: 40px; }
section h2 { font-size: 1.8rem; margin-bottom: 20px; color: #333; padding-bottom: 10px; border-bottom: 3px solid #0066cc; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.video-card { background: #fff; padding: 20px; 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(-5px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.video-card h3, .video-card h4 { margin-bottom: 10px; font-size: 1.2rem; }
.video-card h3 a, .video-card h4 a { color: #333; }
.video-card h3 a:hover, .video-card h4 a:hover { color: #0066cc; }
.video-card .meta { color: #666; font-size: 0.9rem; margin-bottom: 10px; }
.video-card .oneline { color: #555; line-height: 1.6; }
.video-list { background: #fff; padding: 20px; border-radius: 8px; }
.video-item { display: flex; align-items: start; gap: 15px; padding: 15px 0; border-bottom: 1px solid #eee; }
.video-item:last-child { border-bottom: none; }
.video-item .rank { font-size: 1.5rem; font-weight: bold; color: #0066cc; min-width: 30px; }
.video-item h3 { font-size: 1.1rem; margin-bottom: 5px; }
.video-item .brief { color: #666; font-size: 0.9rem; }
.more-link { text-align: center; margin-top: 20px; }
.more-link a { display: inline-block; padding: 10px 30px; background: #0066cc; color: #fff; border-radius: 5px; font-weight: bold; }
.more-link a:hover { background: #0052a3; text-decoration: none; }
.page-header { text-align: center; padding: 40px 20px; background: #fff; border-radius: 8px; margin-bottom: 30px; }
.page-header h1 { font-size: 2.5rem; margin-bottom: 15px; color: #333; }
.page-header .intro { font-size: 1.1rem; color: #666; line-height: 1.8; }
.list-content { background: #fff; padding: 20px; border-radius: 8px; }
.video-card-full { padding: 20px; border-bottom: 1px solid #eee; }
.video-card-full:last-child { border-bottom: none; }
.video-card-full .card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.video-card-full h3 { font-size: 1.3rem; }
.video-card-full .category { background: #667eea; color: #fff; padding: 4px 12px; border-radius: 4px; font-size: 0.85rem; }
.video-card-full .meta { color: #666; margin-bottom: 10px; }
.video-card-full .summary { color: #555; line-height: 1.8; margin-bottom: 10px; }
.video-card-full .tags { color: #999; font-size: 0.9rem; }
.video-item-ranked { display: flex; gap: 20px; padding: 20px; border-bottom: 1px solid #eee; align-items: start; }
.video-item-ranked:last-child { border-bottom: none; }
.video-item-ranked .rank-number { font-size: 2rem; font-weight: bold; color: #999; min-width: 50px; text-align: center; }
.video-item-ranked .rank-number.top-three { color: #ff6b6b; }
.video-item-ranked .item-content { flex: 1; }
.video-item-ranked h3 { font-size: 1.3rem; margin-bottom: 10px; }
.video-item-ranked .brief { color: #666; line-height: 1.6; }
.topic-group { margin-bottom: 40px; }
.topic-group .group-title { font-size: 1.5rem; color: #667eea; margin-bottom: 20px; padding-left: 15px; border-left: 5px solid #667eea; }
.video-item-dated { display: flex; gap: 20px; padding: 20px; border-bottom: 1px solid #eee; }
.video-item-dated:last-child { border-bottom: none; }
.video-item-dated .date-badge { background: #764ba2; color: #fff; padding: 8px 16px; border-radius: 5px; font-weight: bold; min-width: 80px; text-align: center; }
.video-item-dated .item-content { flex: 1; }
.video-item-dated h3 { font-size: 1.3rem; margin-bottom: 10px; }
.detail { background: #fff; padding: 40px; border-radius: 8px; }
.detail-header { text-align: center; padding-bottom: 30px; border-bottom: 2px solid #eee; margin-bottom: 30px; }
.detail-header h1 { font-size: 2.5rem; margin-bottom: 10px; color: #333; }
.detail-header .subtitle { font-size: 1.1rem; color: #666; }
.basic-info ul { list-style: none; }
.basic-info li { padding: 10px 0; border-bottom: 1px solid #f0f0f0; }
.basic-info li:last-child { border-bottom: none; }
.highlight .oneline { font-size: 1.2rem; color: #667eea; font-weight: 500; line-height: 1.8; padding: 20px; background: #f8f9ff; border-radius: 8px; border-left: 4px solid #667eea; }
.summary-section .summary p { margin-bottom: 15px; line-height: 1.8; text-indent: 2em; }
.review-section .review { font-style: italic; color: #555; line-height: 1.8; padding: 20px; background: #f9f9f9; border-radius: 8px; }
footer { text-align: center; padding: 30px 20px; color: #666; border-top: 1px solid #ddd; margin-top: 40px; }
@media (max-width: 768px) {
  .hero h1 { font-size: 1.5rem; }
  .hero .subtitle { font-size: 1rem; }
  .video-grid { grid-template-columns: 1fr; }
  .page-header h1 { font-size: 1.8rem; }
  .detail { padding: 20px; }
  .detail-header h1 { font-size: 1.8rem; }
}