*{box-sizing:border-box;}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;line-height:1.6;margin:0;padding:0;background:#fff;color:#333;}nav{display:flex;flex-wrap:nowrap;justify-content:space-between;align-items:center;background:#222;padding:1rem;position:sticky;top:0;z-index:100;box-shadow:0 2px 4px rgba(0,0,0,0.1);}nav a{flex:1 1 0;min-width:0;text-align:center;color:#fff;text-decoration:none;padding:0.5rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color 0.3s,background 0.3s;border-radius:4px;}nav a:hover{color:#f60;background:rgba(255,102,0,0.1);}main{max-width:1200px;margin:0 auto;padding:2rem 1rem;}h1,h2,h3,h4{line-height:1.3;margin-top:1.5rem;margin-bottom:1rem;}h1{font-size:2rem;color:#111;}h2{font-size:1.5rem;color:#222;border-bottom:2px solid #f60;padding-bottom:0.5rem;}h3{font-size:1.25rem;color:#333;}a{color:#0066cc;text-decoration:none;transition:color 0.3s;}a:hover{color:#f60;text-decoration:underline;}.breadcrumb{padding:1rem;font-size:0.9rem;color:#666;background:#f9f9f9;}.breadcrumb a{color:#0066cc;}.breadcrumb span{color:#999;}.video-card{border:1px solid #ddd;padding:1.5rem;margin:1rem 0;border-radius:8px;background:#fafafa;transition:box-shadow 0.3s,transform 0.3s;}.video-card:hover{box-shadow:0 4px 12px rgba(0,0,0,0.1);transform:translateY(-2px);}.video-card h3{margin-top:0;}.video-card .meta{color:#666;font-size:0.9rem;margin:0.5rem 0;}.video-card .one-line{color:#0066cc;font-weight:500;}.video-card .summary{color:#555;line-height:1.7;}.video-card .review{color:#888;font-style:italic;border-left:3px solid #f60;padding-left:1rem;margin-top:1rem;}section{margin:3rem 0;}.intro{background:#f0f7ff;padding:1.5rem;border-radius:8px;border-left:4px solid #0066cc;}.tags span{background:#e0e0e0;padding:0.3rem 0.6rem;margin:0.3rem;display:inline-block;border-radius:4px;font-size:0.9rem;}@media (max-width:767px){nav{padding:0.5rem;}nav a{font-size:0.75rem;padding:0.5rem 0.2rem;}main{padding:1rem 0.5rem;}h1{font-size:1.5rem;}h2{font-size:1.25rem;}.video-card{padding:1rem;}}@media (min-width:768px) and (max-width:1024px){main{padding:2rem 1.5rem;}}