:root {
  --bg: #ffffff;
  --fg: #1d2433;
  --muted: #5b6475;
  --border: #d8dde6;
  --code-bg: #f4f6f9;
  --link: #1d5bd8;
  --note-bg: #fff8db;
  --note-fg: #5c4d00;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --fg: #e3e7ef;
    --muted: #a0a8b8;
    --border: #2c3341;
    --code-bg: #1b2029;
    --link: #7aa7ff;
    --note-bg: #2e2a14;
    --note-fg: #f0dd8a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; }
header, main, footer { max-width: 860px; margin: 0 auto; padding: 0 16px; }
header { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: baseline; padding-top: 1rem; padding-bottom: .75rem; border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--fg); text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; font-size: .95rem; }
nav a[aria-current="page"] { font-weight: 600; color: var(--fg); }
a { color: var(--link); }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 1.5rem 0 .5rem; }
h2 { font-size: 1.35rem; margin: 2rem 0 .5rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 .4rem; }
.lead { font-size: 1.1rem; color: var(--muted); }
pre, code { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .9em; }
code { background: var(--code-bg); padding: .1em .3em; border-radius: 4px; }
pre { background: var(--code-bg); padding: .9rem 1rem; border-radius: 8px; overflow-x: auto; line-height: 1.45; }
pre code { background: none; padding: 0; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; vertical-align: top; padding: .45rem .6rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
.note { background: var(--note-bg); color: var(--note-fg); padding: .6rem .9rem; border-radius: 8px; }
details { border-bottom: 1px solid var(--border); padding: .6rem 0; }
summary { cursor: pointer; font-weight: 600; }
footer { margin-top: 3rem; padding-top: 1rem; padding-bottom: 2rem; border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; }