:root{--ink:#0f1e2e;--muted:#5b6b7c;--bg:#f6fafc;--card:#fff;--accent:#1a9fd4;--accent2:#2fd0b2;--line:#e3edf3}
@media (prefers-color-scheme:dark){:root{--ink:#eaf3f8;--muted:#9db0c0;--bg:#0c1520;--card:#131f2c;--line:#22323f}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-text-size-adjust:100%}
.wrap{max-width:760px;margin:0 auto;padding:32px 20px 72px}
header{display:flex;align-items:center;gap:14px;margin-bottom:28px}
.logo{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;color:#fff;font-weight:700;font-size:20px}
h1{font-size:28px;margin:0;letter-spacing:-.02em}
.sub{color:var(--muted);font-size:14px;margin-top:2px}
h2{font-size:19px;margin:32px 0 10px;letter-spacing:-.01em}
h3{font-size:16px;margin:22px 0 6px}
p,li{color:var(--ink)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 20px;margin:18px 0}
ul{padding-left:20px}
a{color:var(--accent)}
footer{margin-top:44px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
nav a{margin-right:14px;font-size:14px}