.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.page-header { text-align: center; padding: 40px 20px; background: white; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.page-header h1 { font-size: 28px; color: #2c3e50; margin-bottom: 10px; }
.page-desc { color: #666; font-size: 16px; line-height: 1.8; }
.intro-section { background: white; padding: 30px; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.intro-section p { font-size: 16px; line-height: 1.8; color: #555; }
section { margin-bottom: 40px; }
section h2 { font-size: 24px; color: #2c3e50; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 3px solid #3498db; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.video-list { display: flex; flex-direction: column; gap: 15px; }
.video-card { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.3s, box-shadow 0.3s; position: relative; }
.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; transition: color 0.3s; }
.video-card h3 a:hover { color: #3498db; }
.card-meta { display: flex; gap: 12px; margin-bottom: 10px; font-size: 14px; color: #999; flex-wrap: wrap; }
.card-meta span { background: #ecf0f1; padding: 2px 8px; border-radius: 4px; }
.card-desc { font-size: 14px; color: #666; line-height: 1.6; }
.card-index { position: absolute; top: 10px; right: 10px; background: #3498db; color: white; width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 14px; }
.link-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.link-card { background: white; padding: 25px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.3s; }
.link-card:hover { transform: translateY(-3px); }
.link-card h3 { margin-bottom: 10px; }
.link-card h3 a { color: #3498db; font-size: 20px; }
.link-card p { color: #666; font-size: 14px; line-height: 1.6; }
.detail-page { background: white; padding: 40px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.detail-header h1 { font-size: 32px; color: #2c3e50; margin-bottom: 20px; }
.detail-meta { background: #ecf0f1; padding: 20px; border-radius: 8px; margin-bottom: 30px; }
.meta-row { padding: 8px 0; border-bottom: 1px solid #ddd; font-size: 15px; }
.meta-row:last-child { border-bottom: none; }
.meta-row strong { color: #2c3e50; margin-right: 10px; }
.detail-section { margin-bottom: 30px; }
.detail-section h2 { font-size: 22px; color: #2c3e50; margin-bottom: 15px; padding-bottom: 8px; border-bottom: 2px solid #3498db; }
.detail-section p { font-size: 16px; line-height: 1.8; color: #555; }
.related-section { margin-top: 40px; }
@media (max-width: 768px) {
  .container { padding: 15px; }
  .page-header { padding: 30px 15px; }
  .page-header h1 { font-size: 22px; }
  .video-grid { grid-template-columns: 1fr; }
  .detail-page { padding: 20px; }
  .detail-header h1 { font-size: 24px; }
}