/* Mocha — tier-2 engineer-minimal tokens (see nicgivesmeabuzz/docs/brand/tier2-tokens.css). */
:root {
  --mocha-bg:         #ffffff;                                  /* base surface */
  --mocha-bg-alt:     #f6f7f8;                                  /* alt surface, code blocks */
  --mocha-ink:        #12141a;                                  /* near-black text */
  --mocha-ink-soft:   #565b66;                                  /* muted text, labels */
  --mocha-line:       #e4e6ea;                                  /* hairline borders */
  --mocha-accent:     #0a7d5c;                                  /* single accent (engine demo green) */
  --mocha-accent-ink: #ffffff;                                  /* text on accent */
  --mocha-sans:       system-ui,-apple-system,"Segoe UI",sans-serif; /* body + headings; zero font bytes */
  --mocha-mono:       ui-monospace,"SF Mono","JetBrains Mono",Menlo,monospace; /* numbers, code, wordmark */
  --mocha-radius:     6px;                                      /* tight radius; no pill shapes */
  --mocha-space-1:    .5rem;
  --mocha-space-2:    1rem;
  --mocha-space-3:    1.5rem;
  --mocha-space-4:    2.5rem;
  --mocha-space-5:    4rem;
  --mocha-space-6:    6rem;
  --mocha-measure:    34rem;                                    /* running-text max width */
}

/* mocha skin — tier-2 engineer-minimal. Whitespace and the metric numbers are
   the ornament: no cards, no shadows, no ambient animation. Borders are
   hairlines (--mocha-line); hierarchy comes from type scale and air. */

*,*::before,*::after { box-sizing: border-box; }

html, body { overflow-x: clip; }

body {
  margin: 0;
  font-family: var(--mocha-sans);
  font-size: 1rem;
  color: var(--mocha-ink);
  background: var(--mocha-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Running text keeps to a comfortable reading measure. */
main, .hero, .toc, .law-group { max-width: var(--mocha-measure); }
main { margin: var(--mocha-space-5) auto; padding: 0 var(--mocha-space-2); }

h1, h2, h3, h4 {
  font-family: var(--mocha-sans);
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 var(--mocha-space-2);
}
h1 { font-size: 1.9rem; }
h2 { font-size: 1.3rem; margin-top: var(--mocha-space-4); }
h3 { font-size: 1.05rem; }

p { margin: 0 0 var(--mocha-space-2); }

a { color: var(--mocha-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--mocha-accent);
  outline-offset: 2px;
}

/* ── Nav — mono wordmark + quiet text links on a hairline ─────────────────── */
.mocha-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--mocha-space-3);
  padding: var(--mocha-space-2) var(--mocha-space-3);
  border-bottom: 1px solid var(--mocha-line);
}
.mocha-mark {
  font-family: var(--mocha-mono);
  font-weight: 600;
  color: var(--mocha-ink);
  margin-right: auto;
}
.mocha-links { display: flex; flex-wrap: wrap; gap: var(--mocha-space-3); }
.mocha-links a { color: var(--mocha-ink-soft); }
.mocha-links a:hover { color: var(--mocha-accent); }

/* ── Hero — restrained, generous air; no full-bleed image ─────────────────── */
.hero {
  margin: var(--mocha-space-6) auto var(--mocha-space-5);
  padding: 0 var(--mocha-space-2);
}
.hero h1 { font-size: 2.4rem; }
.hero .lede {
  font-size: 1.15rem;
  color: var(--mocha-ink-soft);
  margin: 0;
}

/* ── Metrics — the number motif; a bare grid, no boxes ────────────────────── */
.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: var(--mocha-space-3);
  margin: var(--mocha-space-4) auto;
  padding: 0 var(--mocha-space-2);
}
.metric { display: flex; flex-direction: column; gap: var(--mocha-space-1); }
.metric-value {
  font-family: var(--mocha-mono);
  font-size: 2rem;
  line-height: 1;
  color: var(--mocha-ink);
}
.metric-label { font-size: .85rem; color: var(--mocha-ink-soft); }
.metric-label small { color: var(--mocha-ink-soft); }

/* ── Table of contents — an ordered chapter list ──────────────────────────── */
.toc { list-style: none; margin: var(--mocha-space-4) auto; padding: 0; }
.toc li { border-top: 1px solid var(--mocha-line); }
.toc li:last-child { border-bottom: 1px solid var(--mocha-line); }
.toc a {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0 var(--mocha-space-2);
  padding: var(--mocha-space-2) 0;
  color: var(--mocha-ink);
}
.toc a:hover { text-decoration: none; color: var(--mocha-accent); }
.toc-n { font-family: var(--mocha-mono); color: var(--mocha-ink-soft); }
.toc-t { font-weight: 600; }
.toc-s { grid-column: 2; font-size: .9rem; color: var(--mocha-ink-soft); }

/* ── Chapter / detail prose — measure is inherited from the `main` rule above;
   `.chapter` is the /case-study static wrapper, `.detail-chapters` the engine's
   chapter detail wrapper. Only the prose type is tuned here. ────────────────── */
.chapter p, .detail-chapters p { color: var(--mocha-ink); }

/* ── Laws — grouped ordered lists ─────────────────────────────────────────── */
.law-group { margin: var(--mocha-space-4) 0; }
.law-group h2 {
  font-family: var(--mocha-mono);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--mocha-ink-soft);
}
.laws { margin: 0; padding-left: 1.4rem; }
.laws li { margin-bottom: var(--mocha-space-2); }
.laws b { font-weight: 650; }

/* ── Code — mono block on the alt surface, hairline, scrolls if wide ──────── */
pre.mocha-code {
  font-family: var(--mocha-mono);
  font-size: .85rem;
  line-height: 1.5;
  background: var(--mocha-bg-alt);
  border: 1px solid var(--mocha-line);
  border-radius: var(--mocha-radius);
  padding: var(--mocha-space-2);
  margin: var(--mocha-space-3) 0;
  overflow-x: auto;
}

/* ── Footer — quiet, muted ────────────────────────────────────────────────── */
footer {
  max-width: var(--mocha-measure);
  margin: var(--mocha-space-6) auto var(--mocha-space-4);
  padding: var(--mocha-space-3) var(--mocha-space-2) 0;
  border-top: 1px solid var(--mocha-line);
  font-size: .85rem;
  color: var(--mocha-ink-soft);
}