:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #1d2635;
  --muted: #5a687b;
  --line: #dce3ed;
  --accent: #3157d5;
  --accent-soft: #e9efff;
  --max: 74rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10141c;
    --surface: #171d28;
    --text: #edf2fa;
    --muted: #aeb9c9;
    --line: #303a4a;
    --accent: #92aaff;
    --accent-soft: #202d55;
  }
}

* { box-sizing: border-box; }
html { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; }
body { margin: 0; background: var(--bg); color: var(--text); }
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
header, main, footer { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
header { padding: 2rem 0 1rem; }
nav { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1.25rem; }
nav .brand { color: var(--text); font-weight: 750; font-size: 1.08rem; text-decoration: none; margin-right: auto; }
main { padding: 1.5rem 0 4rem; }
.hero { padding: clamp(2rem, 7vw, 5rem) 0 2.5rem; max-width: 52rem; }
h1 { font-size: clamp(2rem, 6vw, 3.6rem); line-height: 1.08; letter-spacing: -.035em; margin: 0 0 1rem; }
h2 { margin-top: 2.2rem; line-height: 1.25; }
h3 { margin-top: 1.4rem; }
p, li { max-width: 72ch; }
.lead { font-size: 1.18rem; color: var(--muted); }
.muted, .meta { color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.card { display: block; padding: 1.25rem; border: 1px solid var(--line); border-radius: .8rem; background: var(--surface); text-decoration: none; color: var(--text); }
.card:hover { border-color: var(--accent); }
.card h2, .card h3 { margin: 0 0 .35rem; }
.card p { margin: 0; color: var(--muted); }
.notice { border-left: .3rem solid var(--accent); background: var(--accent-soft); padding: .9rem 1rem; border-radius: .25rem; }
table { width: 100%; border-collapse: collapse; background: var(--surface); }
th, td { padding: .75rem; border: 1px solid var(--line); text-align: left; vertical-align: top; }
code { overflow-wrap: anywhere; }
footer { border-top: 1px solid var(--line); padding: 1.5rem 0 3rem; color: var(--muted); }
.skip { position: absolute; left: -10000px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--surface); padding: .5rem; z-index: 10; }