:root{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:#24334a;background:#f4f7fa;line-height:1.8}*{box-sizing:border-box}body{margin:0}header,main,footer{max-width:850px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;border-bottom:1px solid #dce4ed}a{color:#155b91;text-underline-offset:4px}nav{display:flex;gap:20px;flex-wrap:wrap}main{margin:32px auto;background:white;border:1px solid #dce4ed;border-radius:16px;padding:40px}h1{font-size:clamp(26px,5vw,38px);line-height:1.4}h2{font-size:21px;margin-top:32px}.tag{color:#547088;font-size:14px}footer{color:#617184;font-size:14px}@media(max-width:600px){main{margin:20px 16px;padding:24px}header,footer{padding:20px}}