/* Hallmark · genre: editorial · macrostructure: Long Document · theme: Midnight · enrichment: none · nav: N3 · footer: Ft4 · audience: Chinese billiards players · use: rules comparison · tone: technical */

/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5 */
/* stylelint-disable no-descending-specificity -- prose rhythm intentionally precedes component overrides */
@import url("../tokens.css");

html,
body {
  margin: 0;
  overflow-x: clip;
  background: var(--color-paper);
  color: var(--color-ink);
}

body {
  min-width: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.68;
}

* {
  box-sizing: border-box;
}

a {
  color: var(--color-ink-2);
  text-decoration-color: var(--color-rule);
  text-underline-offset: var(--space-2xs);
  white-space: nowrap;
}

a:hover {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

a:active {
  color: var(--color-accent);
}

a[aria-disabled="true"] {
  color: var(--color-neutral);
  cursor: not-allowed;
  opacity: 0.55;
  pointer-events: none;
}

a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: var(--space-2xs);
}

.rule-rail {
  min-height: 3.5rem;
  padding: var(--space-xs) clamp(var(--space-md), 4vw, var(--space-xl));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper);
}

.rule-rail__brand,
.rule-rail__back {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
}

.rule-rail__links {
  display: none;
}

.rule-document {
  width: min(100%, 78rem);
  margin-inline: auto;
  padding: var(--space-2xl) clamp(var(--space-md), 5vw, var(--space-3xl));
}

.rule-intro,
.rule-prose,
.rule-colophon {
  max-width: var(--measure-copy);
}

.rule-intro__date {
  margin: 0 0 var(--space-lg);
  color: var(--color-neutral);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.rule-intro h1 {
  min-width: 0;
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.rule-intro__lede {
  margin: var(--space-xl) 0 0;
  color: var(--color-ink-2);
  font-size: var(--text-md);
}

.rule-summary {
  margin-top: var(--space-2xl);
  border-top: var(--rule-hair) solid var(--color-rule);
}

.rule-summary p {
  margin: 0;
  padding-block: var(--space-sm);
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.rule-summary strong {
  color: var(--color-accent);
  font-size: var(--text-sm);
  white-space: nowrap;
}

.rule-prose {
  margin-top: var(--space-3xl);
}

.rule-prose section {
  scroll-margin-top: var(--space-xl);
}

.rule-prose section + section {
  margin-top: var(--space-3xl);
}

.rule-prose h2 {
  margin: 0 0 var(--space-md);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  min-width: 0;
  overflow-wrap: anywhere;
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.rule-prose p {
  margin: 0;
  color: var(--color-muted);
}

.rule-prose p + p {
  margin-top: var(--space-md);
}

.implementation-list {
  margin: var(--space-xl) 0;
  border-top: var(--rule-hair) solid var(--color-rule);
}

.implementation-list div {
  padding-block: var(--space-md);
  display: grid;
  gap: var(--space-xs);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.implementation-list dt {
  color: var(--color-accent);
  font-weight: 600;
}

.implementation-list dd {
  margin: 0;
  color: var(--color-ink-2);
}

.source-line {
  font-size: var(--text-sm);
}

.score-sheet {
  margin: var(--space-xl) 0;
  display: grid;
  border-top: var(--rule-hair) solid var(--color-rule);
}

.score-sheet div {
  min-width: 0;
  padding-block: var(--space-md);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-xs) var(--space-md);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.score-sheet dt {
  color: var(--color-ink);
  font-weight: 600;
}

.score-sheet dd {
  margin: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-variant-numeric: tabular-nums;
}

.score-sheet p {
  grid-column: 1 / -1;
  font-size: var(--text-sm);
}

code {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.rule-note {
  padding-top: var(--space-xl);
  border-top: var(--rule-hair) solid var(--color-rule);
}

.text-cta {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration-color: var(--color-accent);
}

.rule-colophon {
  margin: var(--space-xl) auto 0;
  padding: var(--space-xl) clamp(var(--space-md), 5vw, var(--space-3xl))
    calc(var(--space-2xl) + env(safe-area-inset-bottom));
  border-top: var(--rule-hair) solid var(--color-rule);
  color: var(--color-neutral);
  font-family: var(--font-body);
  font-size: var(--text-sm);
}

.rule-colophon p {
  margin: 0;
}

@media (width >= 40rem) {
  .implementation-list div {
    grid-template-columns: 7rem minmax(0, 1fr);
  }

  .score-sheet {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-xl);
  }
}

@media (width >= 60rem) {
  body {
    padding-left: calc(var(--space-2xl) + var(--space-2xs));
  }

  .rule-rail {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: var(--z-sticky);
    width: calc(var(--space-2xl) + var(--space-2xs));
    padding: var(--space-md) var(--space-xs);
    flex-direction: column;
    border-right: var(--rule-hair) solid var(--color-rule);
    border-bottom: 0;
  }

  .rule-rail__brand,
  .rule-rail__back {
    writing-mode: vertical-rl;
  }

  .rule-rail__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }

  .rule-rail__links a {
    min-width: 2.75rem;
    min-height: 2.75rem;
    display: grid;
    place-items: center;
    color: var(--color-neutral);
    font-size: var(--text-sm);
    text-decoration: none;
    writing-mode: vertical-rl;
  }

  .rule-document {
    padding-top: var(--space-3xl);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
  }
}