:root{color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:#07111f;color:#e8f2ff;font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}main{width:min(760px,calc(100% - 32px));margin:48px auto 80px;padding:32px;border:1px solid #29415d;border-radius:18px;background:#0d1a2b}h1{font-size:clamp(2rem,6vw,3.5rem);line-height:1.05}h2{margin-top:2rem;color:#baddff}a{color:#86c8ff;text-underline-offset:3px}strong{color:#fff}@media(max-width:600px){main{margin-top:20px;padding:22px}}