* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; line-height: 1.6; color: #333; background: #f5f5f5; }
.header { background: #fff; box-shadow: 0 2px 4px rgba(0,0,0,0.1); padding: 1rem 0; position: sticky; top: 0; z-index: 1000; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1rem; }
.logo { font-size: 1.5rem; font-weight: bold; color: #e74c3c; text-decoration: none; }
.nav { display: flex; flex-wrap: nowrap; justify-content: space-between; align-items: center; margin-top: 0.5rem; }
.nav a { flex: 1 1 0; min-width: 0; text-align: center; text-decoration: none; color: #555; padding: 0.5rem 0.25rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 0.9rem; transition: color 0.3s; }
.nav a:hover { color: #e74c3c; }
@media (max-width: 767px) {
  .nav a { font-size: 0.8rem; padding: 0.4rem 0.15rem; }
}
.main-content { padding: 2rem 0; min-height: 60vh; }
.hero { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 3rem 2rem; border-radius: 8px; margin-bottom: 2rem; text-align: center; }
.hero h1 { font-size: 1.8rem; margin-bottom: 1rem; line-height: 1.4; }
.hero p { font-size: 1rem; opacity: 0.95; max-width: 800px; margin: 0 auto; }
.intro-section, .links-section { background: white; padding: 2rem; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 1px 3px rgba(0,0,0,0.1); line-height: 1.8; }
.hot-section, .latest-section, .topic-section { margin-bottom: 3rem; }
.hot-section h2, .latest-section h2, .topic-section h2 { font-size: 1.5rem; margin-bottom: 1.5rem; padding-bottom: 0.5rem; border-bottom: 3px solid #e74c3c; color: #333; }
.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 4px rgba(0,0,0,0.1); transition: transform 0.3s, box-shadow 0.3s; }
.video-card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.video-card .meta { color: #888; font-size: 0.85rem; margin-bottom: 0.5rem; }
.video-card p { font-size: 0.9rem; color: #555; line-height: 1.6; }
.page-intro { background: white; padding: 1.5rem; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 1px 3px rgba(0,0,0,0.1); font-size: 1rem; line-height: 1.8; }
.video-list { background: white; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); overflow: hidden; }
.list-item { padding: 1.5rem; border-bottom: 1px solid #eee; display: flex; gap: 1rem; align-items: flex-start; transition: background 0.3s; }
.list-item:hover { background: #f9f9f9; }
.list-item:last-child { border-bottom: none; }
.item-num { display: inline-block; min-width: 40px; text-align: center; font-weight: bold; color: #999; font-size: 1.2rem; }
.rank-badge { display: inline-flex; align-items: center; justify-content: center; min-width: 40px; height: 40px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border-radius: 50%; font-weight: bold; font-size: 1rem; flex-shrink: 0; }
.item-content { flex: 1; }
.item-content h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.item-content .meta { color: #888; font-size: 0.85rem; margin-bottom: 0.5rem; }
.item-content p { font-size: 0.9rem; color: #555; line-height: 1.6; margin-bottom: 0.3rem; }
.review-snippet { font-size: 0.85rem; color: #666; font-style: italic; margin-top: 0.5rem; }
.detail-article { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); margin-bottom: 2rem; }
.detail-article h1 { font-size: 1.8rem; margin-bottom: 1.5rem; color: #333; border-bottom: 3px solid #e74c3c; padding-bottom: 0.5rem; }
.detail-article h2 { font-size: 1.3rem; margin: 2rem 0 1rem; color: #555; }
.detail-article ul { list-style: none; padding: 0; }
.detail-article li { padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; }
.detail-article li:last-child { border-bottom: none; }
.detail-article p { line-height: 1.8; font-size: 1rem; color: #444; }
.related-section { margin-top: 3rem; padding-top: 2rem; border-top: 2px solid #eee; }
.footer { background: #333; color: white; padding: 2rem 0; text-align: center; margin-top: 3rem; }
a { color: #3498db; text-decoration: none; }
a:hover { text-decoration: underline; }
@media (max-width: 768px) {
  .hero h1 { font-size: 1.3rem; }
  .video-grid { grid-template-columns: 1fr; }
  .detail-article { padding: 1.5rem; }
}