*{box-sizing:border-box}
:root{--bg:#eef1f5;--card:#fff;--ink:#111827;--mute:#64748b;--line:#e2e8f0;--acc:#1d4ed8}
@media (prefers-color-scheme:dark){:root{--bg:#0b0f14;--card:#141a22;--ink:#e6edf3;--mute:#94a3b8;--line:#252d3a;--acc:#60a5fa}}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 "Inter","Segoe UI",system-ui,-apple-system,Roboto,sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding-left:20px;padding-right:20px}
header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;padding-top:20px;padding-bottom:16px}
.brand{font-weight:700;color:var(--ink);text-decoration:none}
nav a{margin-left:16px;color:var(--mute);text-decoration:none;font-size:14.5px}
nav a[aria-current=page]{color:var(--ink);font-weight:600}
main{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:32px 36px;margin-bottom:24px}
h1{font-size:28px;line-height:1.25;margin:0 0 8px}
h2{font-size:19px;margin:28px 0 8px}
p,li{max-width:70ch}
a{color:var(--acc)}
.btn{display:inline-block;background:var(--acc);color:#fff;text-decoration:none;font-weight:600;padding:10px 18px;border-radius:8px}
small{color:var(--mute)}
footer{color:var(--mute);font-size:13px;padding-bottom:32px}
@media (max-width:600px){main{padding:22px 18px}}