.container { max-width: 1200px; margin: 0 auto; padding: 2rem 1rem; }
.hero { text-align: center; padding: 3rem 1rem; background: white; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.hero h1 { font-size: 2rem; margin-bottom: 1rem; color: #2c3e50; }
.intro { font-size: 1.1rem; line-height: 1.8; color: #555; max-width: 800px; margin: 0 auto; }
section { margin-bottom: 3rem; }
h2 { font-size: 1.5rem; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid #3498db; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.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 16px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.video-card h3 a { color: #2c3e50; text-decoration: none; }
.video-card h3 a:hover { color: #3498db; }
.meta { color: #777; font-size: 0.9rem; margin-bottom: 0.5rem; }
.desc { color: #555; font-size: 0.95rem; line-height: 1.6; }
.tags { color: #999; font-size: 0.85rem; margin-top: 0.5rem; }
.video-list { display: flex; flex-direction: column; gap: 1rem; }
.video-item { background: white; padding: 1rem 1.5rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.video-item h3 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.video-item h3 a { color: #2c3e50; text-decoration: none; }
.video-item h3 a:hover { color: #3498db; }
.more-link { text-align: center; margin-top: 1.5rem; }
.more-link a { color: #3498db; font-size: 1.1rem; text-decoration: none; }
.more-link a:hover { text-decoration: underline; }
.topic-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.topic-item { display: block; background: white; padding: 1.5rem; border-radius: 8px; text-decoration: none; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.3s; }
.topic-item:hover { transform: translateY(-4px); }
.topic-item h3 { color: #2c3e50; margin-bottom: 0.5rem; }
.topic-item p { color: #666; }
.all-link { text-align: center; }
.btn-large { display: inline-block; background: #3498db; color: white; padding: 1rem 3rem; border-radius: 8px; font-size: 1.2rem; text-decoration: none; transition: background 0.3s; }
.btn-large:hover { background: #2980b9; }
.page-header { background: white; padding: 2rem; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.page-header h1 { font-size: 1.8rem; margin-bottom: 0.5rem; }
.video-list-page { display: flex; flex-direction: column; gap: 1rem; }
.video-item-full { background: white; padding: 1.5rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); display: flex; gap: 1rem; }
.item-number { font-size: 2rem; font-weight: bold; color: #3498db; min-width: 50px; }
.item-content { flex: 1; }
.detail-page { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.video-detail h1 { font-size: 2rem; margin-bottom: 1.5rem; color: #2c3e50; }
.video-info ul { list-style: none; }
.video-info li { padding: 0.5rem 0; border-bottom: 1px solid #eee; }
.video-highlight, .video-summary, .video-review { margin-top: 2rem; }
.video-highlight p, .video-summary p, .video-review p { line-height: 1.8; color: #555; font-size: 1.05rem; }
.related-videos { margin-top: 3rem; }
footer { background: #2c3e50; color: white; text-align: center; padding: 2rem; margin-top: 3rem; }
@media (max-width: 768px) {
  .hero h1 { font-size: 1.5rem; }
  .intro { font-size: 1rem; }
  .video-grid { grid-template-columns: 1fr; }
  .item-number { font-size: 1.5rem; min-width: 40px; }
}