:root{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:#243047;background:#f5f7fb;line-height:1.75}*{box-sizing:border-box}body{margin:0}main,header,footer{max-width:920px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}a{color:#2457c5}nav{display:flex;gap:18px;flex-wrap:wrap}.card{background:white;border:1px solid #dde2ea;border-radius:16px;padding:28px;margin:20px 0}h1{font-size:clamp(28px,5vw,42px);line-height:1.3}h2{font-size:22px;margin-top:28px}.tag{color:#2457c5;font-weight:600}.muted,footer{color:#657188}.button{display:inline-block;padding:10px 18px;background:#2457c5;color:white;text-decoration:none;border-radius:10px}li{margin:8px 0}@media(max-width:560px){main,header,footer{padding:16px}.card{padding:20px}}