:root { --ink:#172b4d; --muted:#5e6c84; --line:#dfe1e6; --accent:#0c66e4; --bg:#fff; --soft:#f4f5f7; }
@media (prefers-color-scheme: dark) { :root { --ink:#e6e9ef; --muted:#9fadbc; --line:#343b46; --accent:#579dff; --bg:#161a1d; --soft:#22272b; } }
* { box-sizing:border-box; }
body { margin:0; font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif; color:var(--ink); background:var(--bg); }
header, main, footer { max-width:760px; margin:0 auto; padding:0 20px; }
header { display:flex; justify-content:space-between; align-items:center; padding-top:24px; padding-bottom:24px; border-bottom:1px solid var(--line); flex-wrap:wrap; gap:12px; }
header a.brand { font-weight:700; color:var(--ink); text-decoration:none; font-size:19px; }
nav a { margin-left:18px; color:var(--muted); text-decoration:none; }
nav a:first-child { margin-left:0; }
a { color:var(--accent); }
h1 { font-size:34px; line-height:1.2; margin:48px 0 12px; }
h2 { font-size:22px; margin:40px 0 8px; }
h3 { font-size:18px; margin:28px 0 6px; }
p.lead { font-size:20px; color:var(--muted); margin-top:0; }
code { background:var(--soft); padding:2px 6px; border-radius:4px; font-size:15px; }
table { border-collapse:collapse; width:100%; margin:12px 0; }
th, td { text-align:left; padding:8px 10px; border-bottom:1px solid var(--line); vertical-align:top; }
.note { background:var(--soft); border-left:4px solid var(--accent); padding:12px 16px; border-radius:4px; }
.button { display:inline-block; background:var(--accent); color:#fff; padding:10px 18px; border-radius:6px; text-decoration:none; font-weight:600; }
footer { margin-top:64px; padding-top:20px; padding-bottom:40px; border-top:1px solid var(--line); color:var(--muted); font-size:15px; }