:root{--ink:#1f2430;--muted:#5b6474;--line:#e3e6eb;--accent:#0b5fa5;--bg:#fbfbfc}
*{box-sizing:border-box}html{color-scheme:light}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 20px}
header{padding-top:28px;display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:8px 20px}
header a.brand{font-weight:700;color:var(--ink);text-decoration:none;font-size:18px}
nav a{color:var(--accent);text-decoration:none;margin-left:16px}nav a:hover{text-decoration:underline}
main{padding:24px 20px 48px}h1{font-size:30px;line-height:1.2;margin:8px 0 6px}h2{font-size:20px;margin:32px 0 8px}h3{font-size:17px;margin:22px 0 4px}
p.lead{color:var(--muted);font-size:17px;margin-top:0}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:14px;padding:18px 20px 36px}
a{color:var(--accent)}code{background:#eef1f5;padding:1px 5px;border-radius:4px;font-size:.95em}
ul,ol{padding-left:22px}li{margin:4px 0}.note{border-left:3px solid var(--accent);background:#eef5fb;padding:10px 14px;margin:16px 0}
@media (max-width:480px){h1{font-size:25px}nav a{margin-left:10px}}