:root{font-family:system-ui,sans-serif;color:#233144;background:#f3f5f8;line-height:1.65}main{max-width:820px;margin:60px auto;padding:32px;background:white;border-radius:14px}header{display:flex;justify-content:space-between;gap:20px;font-size:13px;color:#617189}nav a{margin-left:12px}a{color:#28608c}h1{font-size:clamp(30px,5vw,46px);line-height:1.2;margin-top:48px}h2{margin-top:36px}.lead{font-size:20px;color:#52657a}footer{margin-top:48px;border-top:1px solid #e5e9ef;padding-top:20px;color:#617189;font-size:13px}@media(max-width:600px){main{margin:16px;padding:24px}header{display:block}nav a{margin:0 12px 0 0}}