:root {
  color-scheme: light dark;
  --bg: #fdfdfc;
  --card: #fff;
  --inset: #f5f5f4;
  --line: #e9e9e9;
  --heading: #0b0b0b;
  --text: #4b4b4b;
  --muted: #6b6b6b;
  --faint: #898989;
  --brand: oklch(0.63 0.185 40);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.6 Inter, ui-sans-serif, system-ui, sans-serif; }
a { color: inherit; }
.skip-link { position: fixed; z-index: 10; top: 0.75rem; left: 0.75rem; padding: 0.6rem 0.8rem; border-radius: 0.4rem; background: var(--heading); color: var(--bg); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.site-shell { width: min(100%, 1512px); min-height: 100vh; margin-inline: auto; border-inline: 1px solid var(--line); }
.site-header { min-height: 67px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 0 2rem; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--heading); font-weight: 600; text-decoration: none; }
.brand img { width: 22px; height: 22px; }
nav { display: flex; gap: 1.75rem; }
nav a { color: var(--muted); font-size: 0.875rem; text-decoration: none; }
nav a:hover, nav a:focus-visible { color: var(--heading); }
.content { width: min(100% - 2.5rem, 1024px); margin-inline: auto; padding-block: 4rem; }
.hero { max-width: 760px; }
.hero h1 { margin: 0.8rem 0 1rem; color: var(--heading); font-size: clamp(2.4rem, 7vw, 4rem); line-height: 1; letter-spacing: -0.055em; }
.hero p:not(.eyebrow) { margin: 0; font-size: 1.05rem; line-height: 1.75; color: var(--muted); }
.eyebrow { margin: 0; color: var(--brand); font: 600 0.72rem/1.2 ui-monospace, monospace; letter-spacing: 0.16em; text-transform: uppercase; }
.json-link, .back-link { display: inline-flex; margin-top: 1.25rem; color: var(--heading); font-weight: 600; text-underline-offset: 0.25rem; }
.catalog-section { margin-top: 3.25rem; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--line); }
.section-heading h2, .detail h2, .two-column h2 { margin: 0; color: var(--heading); font-size: 1.1rem; }
.section-heading span { color: var(--faint); font: 0.75rem ui-monospace, monospace; }
.rule-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.6rem; margin: 0; padding: 0.8rem 0 0; list-style: none; }
.rule-card { height: 100%; display: flex; flex-direction: column; padding: 1rem; border: 1px solid var(--line); border-radius: 0.55rem; background: var(--card); text-decoration: none; }
.rule-card:hover, .rule-card:focus-visible { background: var(--inset); outline: 2px solid transparent; }
.rule-card strong { color: var(--heading); font: 600 0.83rem/1.4 ui-monospace, monospace; overflow-wrap: anywhere; }
.rule-card > span { display: -webkit-box; margin-top: 0.5rem; overflow: hidden; color: var(--muted); font-size: 0.78rem; line-height: 1.55; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.rule-card small { margin-top: auto; padding-top: 0.8rem; color: var(--faint); font-size: 0.64rem; letter-spacing: 0.05em; text-transform: uppercase; }
.rule-hero { margin-top: 2.25rem; }
.rule-hero h1 code { font: inherit; overflow-wrap: anywhere; }
.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.7rem; margin: 2.5rem 0 0; }
.facts > div { padding: 1rem; border-radius: 0.5rem; background: var(--inset); }
.facts dt { color: var(--muted); font-size: 0.72rem; }
.facts dd { margin: 0.35rem 0 0; color: var(--heading); font: 600 0.82rem ui-monospace, monospace; }
.two-column { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 3rem; margin-top: 2.8rem; padding-top: 2.8rem; border-top: 1px solid var(--line); }
.tags, .requirements { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.9rem 0 0; padding: 0; list-style: none; }
.tags li { padding: 0.35rem 0.7rem; border-radius: 999px; background: var(--inset); font: 0.72rem ui-monospace, monospace; }
.requirements { display: grid; }
.requirements li { display: flex; flex-wrap: wrap; gap: 0.6rem; padding: 0.8rem; border: 1px solid var(--line); border-radius: 0.5rem; background: var(--card); }
.requirements span, .two-column section > p { color: var(--muted); font-size: 0.82rem; }
.detail { margin-top: 2.8rem; padding-top: 2.8rem; border-top: 1px solid var(--line); }
.detail p, .detail li { color: var(--muted); }
.detail small { color: var(--faint); font: 0.72rem ui-monospace, monospace; }
footer { width: min(100% - 2.5rem, 1024px); margin: 0 auto; padding: 1.5rem 0 2.5rem; border-top: 1px solid var(--line); color: var(--faint); font-size: 0.78rem; }
footer a { color: var(--text); }

@media (prefers-color-scheme: dark) {
  :root { --bg: #08090a; --card: #0d0d0e; --inset: #0c0d0e; --line: #181a1d; --heading: #fff; --text: #c8c8c8; --muted: #85898d; --faint: #6a6c6d; --brand: oklch(0.72 0.16 45); }
}

@media (max-width: 700px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: 0.8rem; padding: 1rem 1.25rem; }
  .content { padding-block: 2.8rem; }
  .rule-grid, .facts, .two-column { grid-template-columns: 1fr; }
  .two-column { gap: 2rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}