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a:hover{color:#e74c3c;}.related-item p{font-size:0.9rem;color:#666;line-height:1.5;}.error-page{text-align:center;padding:4rem 2rem;background:white;border-radius:8px;}.error-page h1{font-size:3rem;color:#e74c3c;margin-bottom:1rem;}.error-page p{font-size:1.1rem;margin-bottom:1rem;color:#666;}.error-page a{color:#3498db;font-weight:600;}.error-page a:hover{text-decoration:underline;}.page-desc,.notice{line-height:1.8;color:#555;margin-bottom:1.5rem;}.notice{background:#fff3cd;padding:1rem;border-left:4px solid #ffc107;border-radius:4px;}.notice a{color:#0056b3;font-weight:600;}.more-link{text-align:center;margin-top:1.5rem;}.more-link a{color:#3498db;font-weight:600;font-size:1.05rem;}.more-link a:hover{text-decoration:underline;}@media (max-width:768px){.hero h1{font-size:1.5rem;}.hero .site-intro{font-size:1rem;}.nav-menu{gap:0.2rem;}.nav-menu a{padding:0.4rem 0.5rem;font-size:0.85rem;flex:1 1 0;text-align:center;}.video-grid,.related-grid{grid-template-columns:1fr;}.detail-header h1{font-size:1.5rem;}main{padding:0 0.5rem;}section{padding:1.5rem;}}