:root{color-scheme:light;--ink:#192b3a;--muted:#526475;--line:#d9e4ed;--accent:#145ca8}*{box-sizing:border-box}body{margin:0;background:#f6f9fc;color:var(--ink);font:16px/1.65 system-ui,-apple-system,Segoe UI,sans-serif}header,main,footer{max-width:850px;margin:auto;padding:24px}header{display:flex;align-items:center;justify-content:space-between;gap:15px;border-bottom:1px solid var(--line)}nav{display:flex;gap:15px;flex-wrap:wrap}a{color:var(--accent)}header a{text-decoration:none}main{padding-top:36px;padding-bottom:48px}h1{font-size:2.1rem;line-height:1.2}h2{margin-top:32px;font-size:1.22rem}article{background:white;border:1px solid var(--line);border-radius:16px;padding:24px;margin-top:20px}.muted,footer{color:var(--muted)}footer{border-top:1px solid var(--line);font-size:.9rem}ul{padding-left:24px}@media(max-width:600px){header{display:block}nav{margin-top:10px}article{padding:18px}}