:root { --ink:#1f2937; --muted:#6b7280; --line:#e5e7eb; --brand:#1d4ed8; --bg:#f9fafb; }
* { box-sizing: border-box; }
body { margin:0; font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif; color:var(--ink); background:var(--bg); }
.wrap { max-width:720px; margin:0 auto; padding:0 20px; }
header { background:#fff; border-bottom:1px solid var(--line); }
header .wrap { padding:18px 20px; display:flex; justify-content:space-between; align-items:center; }
header a.brand { font-weight:700; font-size:18px; color:var(--ink); text-decoration:none; }
header nav a { margin-left:16px; font-size:14px; }
h1 { font-size:34px; line-height:1.15; margin:44px 0 12px; }
h2 { font-size:19px; margin:32px 0 8px; }
.lead { font-size:18px; color:var(--muted); margin:0 0 28px; }
.updated { color:var(--muted); font-size:14px; margin:0 0 20px; }
.card { background:#fff; border:1px solid var(--line); border-radius:12px; padding:22px; margin:0 0 18px; }
ul { padding-left:22px; } li { margin:4px 0; }
a { color:var(--brand); }
footer { margin:48px 0 36px; color:var(--muted); font-size:13px; }
footer p { margin:0 0 8px; }