body{margin:0;background:#f5f7fa;color:#202b3a;font:17px/1.85 system-ui,-apple-system,sans-serif}main{max-width:820px;margin:50px auto;padding:36px;background:white;border:1px solid #dce3ed;border-radius:18px}nav{display:flex;gap:20px;flex-wrap:wrap;border-bottom:1px solid #dce3ed;padding-bottom:18px}a{color:#1759a6}h1{font-size:32px;line-height:1.4}h2{font-size:22px;margin-top:30px}.tag,footer{color:#617086;font-size:14px}footer{border-top:1px solid #dce3ed;margin-top:30px;padding-top:18px}@media(max-width:600px){main{margin:12px;padding:22px}h1{font-size:27px}}