:root {
  --ink: #1d232a; --muted: #5b6672; --line: #dde3e9; --paper: #ffffff; --tint: #f4f7fa;
  --accent: #2463c4; --code: #f2f4f7;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #e3e8ee; --muted: #9aa6b2; --line: #2c343d; --paper: #12161b; --tint: #181e25;
    --accent: #7fb0ff; --code: #1c232b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
header { border-bottom: 1px solid var(--line); background: var(--tint); }
header nav, main { max-width: 980px; margin: 0 auto; padding: 0 20px; }
header nav { display: flex; gap: 22px; align-items: baseline; flex-wrap: wrap; padding-top: 14px; padding-bottom: 14px; }
header nav .brand { font-weight: 700; font-size: 18px; margin-right: auto; color: var(--ink); }
header nav .version { color: var(--muted); font-weight: 400; font-size: 14px; margin-left: 6px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
main { padding-top: 12px; padding-bottom: 60px; }
h1 { font-size: 30px; margin: 28px 0 8px; }
h2 { font-size: 22px; margin: 36px 0 8px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 17px; margin: 26px 0 4px; }
p.lead { color: var(--muted); font-size: 18px; margin-top: 0; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 14px; }
code { background: var(--code); padding: 1px 5px; border-radius: 4px; }
pre { background: var(--code); padding: 14px 16px; border-radius: 8px; overflow-x: auto; line-height: 1.45; }
pre code { background: none; padding: 0; }
table { border-collapse: collapse; width: 100%; margin: 8px 0 4px; font-size: 14px; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.toc { columns: 3 180px; padding-left: 18px; }
.toc li { break-inside: avoid; }
.signature { font-size: 15px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; background: var(--tint); }
.card h3 { margin-top: 0; }
footer { color: var(--muted); font-size: 13px; text-align: center; padding: 30px 0; border-top: 1px solid var(--line); }