:root { --fg:#1f2933; --muted:#64748b; --line:#e2e8f0; --accent:#1d4ed8; }
* { box-sizing:border-box; }
body { margin:0; font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
       color:var(--fg); background:#fff; }
header { border-bottom:1px solid var(--line); }
.wrap { max-width:760px; margin:0 auto; padding:0 24px; }
nav { display:flex; align-items:center; gap:24px; height:64px; }
nav .brand { font-weight:600; letter-spacing:-.01em; }
nav a { color:var(--muted); text-decoration:none; font-size:15px; }
nav a:hover { color:var(--accent); }
main { padding:56px 0 72px; }
h1 { font-size:32px; line-height:1.25; margin:0 0 16px; letter-spacing:-.02em; }
h2 { font-size:20px; margin:36px 0 12px; }
p { margin:0 0 16px; }
ul { padding-left:20px; }
li { margin-bottom:8px; }
.muted { color:var(--muted); }
.card { border:1px solid var(--line); border-radius:10px; padding:20px 22px; margin:24px 0; }
code { background:#f1f5f9; padding:2px 6px; border-radius:4px; font-size:14px; }
footer { border-top:1px solid var(--line); padding:24px 0; color:var(--muted); font-size:14px; }