* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6; 
  color: #333; 
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}
a { color: #667eea; text-decoration: none; transition: color 0.3s; }
a:hover { color: #764ba2; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
header { background: rgba(255,255,255,0.95); box-shadow: 0 2px 10px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
nav { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; flex-wrap: nowrap; }
.logo { font-size: 1.5rem; font-weight: bold; color: #667eea; white-space: nowrap; }
.nav-links { display: flex; gap: 1.5rem; list-style: none; flex-wrap: nowrap; }
.nav-links a { color: #555; font-weight: 500; white-space: nowrap; }
main { padding: 2rem 0; }
.hero { background: white; border-radius: 12px; padding: 3rem 2rem; margin-bottom: 2rem; box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
.hero h1 { font-size: 2rem; margin-bottom: 1rem; color: #333; }
.hero p { font-size: 1.1rem; color: #666; line-height: 1.8; }
.section { background: white; border-radius: 12px; padding: 2rem; margin-bottom: 2rem; box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
.section h2 { font-size: 1.5rem; margin-bottom: 1.5rem; color: #333; border-left: 4px solid #667eea; padding-left: 1rem; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.video-card { background: #f8f9fa; border-radius: 8px; padding: 1.5rem; transition: transform 0.3s, box-shadow 0.3s; }
.video-card:hover { transform: translateY(-5px); box-shadow: 0 6px 20px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: #333; }
.video-meta { font-size: 0.9rem; color: #777; margin-bottom: 0.5rem; }
.video-desc { font-size: 0.95rem; color: #666; line-height: 1.6; }
.video-list { display: flex; flex-direction: column; gap: 1.5rem; }
.video-item { background: #f8f9fa; border-radius: 8px; padding: 1.5rem; display: flex; gap: 1rem; transition: transform 0.3s; }
.video-item:hover { transform: translateX(5px); }
.video-rank { font-size: 2rem; font-weight: bold; color: #667eea; min-width: 60px; display: flex; align-items: center; justify-content: center; }
.video-info { flex: 1; }
.video-info h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
footer { background: rgba(255,255,255,0.9); padding: 2rem 0; margin-top: 3rem; text-align: center; color: #666; }
@media (max-width: 768px) {
  nav { flex-direction: column; gap: 1rem; padding: 0.8rem 0; }
  .logo { font-size: 1.3rem; }
  .nav-links { width: 100%; justify-content: space-between; gap: 0.5rem; flex-wrap: nowrap; overflow-x: auto; }
  .nav-links li { flex: 1 1 0; min-width: 0; }
  .nav-links a { font-size: 0.85rem; padding: 0.3rem 0.2rem; display: block; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .hero h1 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .video-item { flex-direction: column; }
  .video-rank { min-width: auto; }
}