.main-content { padding: 40px 0; }
.hero-section { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 60px 0; text-align: center; }
.hero-section h1 { font-size: 2.5rem; margin-bottom: 20px; }
.hero-section .subtitle { font-size: 1.1rem; opacity: 0.95; max-width: 800px; margin: 0 auto; line-height: 1.6; }
.intro-section { background: #fff; padding: 40px 0; margin: 40px 0; border-radius: 8px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.intro-section p { line-height: 1.8; font-size: 1rem; color: #555; }
section { margin: 40px 0; }
section h2 { font-size: 1.8rem; margin-bottom: 24px; color: #2c3e50; border-left: 4px solid #3498db; padding-left: 15px; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.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(-4px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.video-card h3, .video-card h4 { font-size: 1.1rem; margin-bottom: 10px; color: #2c3e50; }
.video-card h3 a, .video-card h4 a { color: #2c3e50; }
.video-card h3 a:hover, .video-card h4 a:hover { color: #3498db; }
.video-card .meta { font-size: 0.85rem; color: #7f8c8d; margin-bottom: 10px; }
.video-card .desc { font-size: 0.9rem; color: #555; line-height: 1.5; }
.video-list { display: flex; flex-direction: column; gap: 20px; }
.video-item { background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); transition: box-shadow 0.3s; }
.video-item:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.12); }
.video-item h3 { font-size: 1.2rem; margin-bottom: 10px; color: #2c3e50; }
.video-item h3 a { color: #2c3e50; }
.video-item h3 a:hover { color: #3498db; }
.video-item .meta { font-size: 0.9rem; color: #7f8c8d; margin-bottom: 8px; }
.video-item p { color: #555; line-height: 1.6; }
.video-item.ranked { display: flex; gap: 20px; align-items: flex-start; }
.rank-number { font-size: 2rem; font-weight: bold; color: #e74c3c; min-width: 50px; text-align: center; }
.video-info { flex: 1; }
.video-item.with-date { display: flex; gap: 15px; align-items: flex-start; }
.date-badge { background: #3498db; color: white; padding: 8px 12px; border-radius: 6px; font-weight: bold; min-width: 60px; text-align: center; }
.topic-group { margin-bottom: 40px; }
.group-title { font-size: 1.4rem; color: #2c3e50; margin-bottom: 20px; border-left: 4px solid #e74c3c; padding-left: 12px; }
.link-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.link-card { background: #fff; padding: 24px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); transition: all 0.3s; border-top: 3px solid #3498db; }
.link-card:hover { transform: translateY(-4px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.link-card h3 { font-size: 1.2rem; margin-bottom: 10px; }
.link-card h3 a { color: #2c3e50; }
.link-card h3 a:hover { color: #3498db; }
.link-card p { color: #666; font-size: 0.9rem; line-height: 1.5; }
.detail-article { background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); margin-bottom: 40px; }
.detail-article h1 { font-size: 2.2rem; color: #2c3e50; margin-bottom: 30px; border-bottom: 2px solid #3498db; padding-bottom: 15px; }
.meta-info { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; margin-bottom: 30px; padding: 20px; background: #f8f9fa; border-radius: 6px; }
.meta-item { font-size: 0.95rem; color: #555; }
.meta-item strong { color: #2c3e50; margin-right: 8px; }
.highlight-box { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 24px; border-radius: 8px; margin: 30px 0; }
.highlight-box h3 { font-size: 1.2rem; margin-bottom: 12px; }
.highlight-box p { font-size: 1.05rem; line-height: 1.7; }
.content-section { margin: 30px 0; }
.content-section h2 { font-size: 1.5rem; color: #2c3e50; margin-bottom: 15px; }
.content-section p { line-height: 1.8; color: #555; font-size: 1rem; }
.review-section { background: #f8f9fa; padding: 24px; border-radius: 6px; border-left: 4px solid #27ae60; }
.related-section { margin-top: 40px; }
.page-header { text-align: center; margin-bottom: 40px; padding: 40px 0; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.page-header h1 { font-size: 2rem; color: #2c3e50; margin-bottom: 15px; }
.page-desc { font-size: 1.05rem; color: #666; line-height: 1.6; max-width: 800px; margin: 0 auto; }
.site-footer { background: #2c3e50; color: #ecf0f1; padding: 30px 0; margin-top: 60px; text-align: center; }
.site-footer p { font-size: 0.9rem; }
@media (max-width: 768px) {
  .hero-section h1 { font-size: 1.8rem; }
  .hero-section .subtitle { font-size: 1rem; }
  .video-grid { grid-template-columns: 1fr; }
  .link-cards { grid-template-columns: 1fr; }
  .detail-article { padding: 24px; }
  .detail-article h1 { font-size: 1.6rem; }
  .meta-info { grid-template-columns: 1fr; }
}