/* ──────────────────────────────────────────────────────────────
   recursive.engineering — shared detail-page chrome
   Paper-and-ink design system. Used by /work/* and /writing/*
   ────────────────────────────────────────────────────────────── */

:root {
  --paper: #efece4;
  --paper-soft: #e8e4d8;
  --ink: #15140f;
  --ink-soft: #4a4842;
  --ink-faint: #b0aa9c;
  --rule: #2a2620;
  --rule-soft: #d6d1c2;
  --accent: #c0581f;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;
  --font-serif: 'Fraunces', Georgia, serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(circle at 18% 28%, rgba(0,0,0,0.018) 0%, transparent 45%),
    radial-gradient(circle at 78% 72%, rgba(0,0,0,0.022) 0%, transparent 50%);
}

/* ── Top chrome ──────────────────────────────────────────── */
.top {
  position: sticky; top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px 32px;
  z-index: 50;
  font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--paper);
  border-bottom: 1px solid var(--rule-soft);
}
.top .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.top .mark { width: 14px; height: 14px; display: inline-flex; flex-shrink: 0; animation: spin 18s linear infinite; }
.top .mark svg { display: block; overflow: visible; }
.top .mark rect { fill: none; stroke: currentColor; stroke-width: 0.8; }
.top .mark rect.accent { stroke: var(--accent); }
@keyframes spin { to { transform: rotate(360deg); } }
.top .nav { display: flex; gap: 28px; }
.top a { color: inherit; text-decoration: none; transition: color 0.2s; }
.top a:hover, .top a.current { color: var(--ink); }

/* ── Article shell ───────────────────────────────────────── */
.article {
  position: relative; z-index: 2;
  max-width: 820px;
  margin: 0 auto;
  padding: 64px 32px 96px;
}

.crumb {
  font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 36px;
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none;
  transition: color 0.2s, gap 0.2s;
}
.crumb:hover { color: var(--accent); gap: 12px; }
.crumb .arrow { font-family: var(--font-serif); font-size: 14px; }

.entry-meta {
  display: flex; flex-wrap: wrap; gap: 18px;
  font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 22px;
}
.entry-meta .num { color: var(--ink-faint); }
.entry-meta .kind { color: var(--accent); }

.entry-title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 64px;
  letter-spacing: -0.03em;
  line-height: 1.0;
  margin: 0 0 14px;
  text-wrap: balance;
}
.entry-title em { font-style: italic; font-weight: 400; }

.entry-sub {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: 22px;
  line-height: 1.4;
  color: var(--ink-soft);
  margin: 0 0 40px;
  max-width: 640px;
  text-wrap: pretty;
}

.entry-stats {
  display: flex; flex-wrap: wrap; gap: 24px;
  padding: 16px 0;
  margin-bottom: 48px;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-soft);
}
.entry-stats .label { color: var(--ink-faint); display: block; margin-bottom: 4px; }
.entry-stats .value { color: var(--ink); }

/* ── Long-form body ──────────────────────────────────────── */
.entry-body {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink);
  max-width: 680px;
}
.entry-body p { margin: 0 0 1.4em; text-wrap: pretty; }
.entry-body p.lede {
  font-size: 22px;
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 1.8em;
}
.entry-body h2 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 28px;
  letter-spacing: -0.01em;
  margin: 2.2em 0 0.6em;
  line-height: 1.2;
}
.entry-body h3 {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 2em 0 0.6em;
}
.entry-body em { font-style: italic; }
.entry-body strong { font-weight: 500; }
.entry-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.entry-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--paper-soft);
  padding: 1px 6px;
  border: 1px solid var(--rule-soft);
}
.entry-body blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 24px;
  border-left: 2px solid var(--accent);
  font-style: italic;
  color: var(--ink-soft);
}
.entry-body ul, .entry-body ol {
  padding-left: 1.4em;
}
.entry-body li { margin-bottom: 0.5em; }

.entry-tags {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--rule-soft);
}
.entry-tags .tag {
  font-family: var(--font-mono);
  font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-soft);
  border: 1px solid var(--rule-soft);
  padding: 5px 10px;
}

/* ── Prev / next ─────────────────────────────────────────── */
.entry-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 72px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 32px;
}
.entry-nav a {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 12px 0;
  transition: color 0.2s;
}
.entry-nav a:hover { color: var(--accent); }
.entry-nav .label {
  font-size: 9px; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 8px;
}
.entry-nav .title {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.25;
  color: var(--ink);
  text-wrap: balance;
  transition: color 0.2s;
}
.entry-nav a:hover .title { color: var(--accent); }
.entry-nav .next { text-align: right; }

/* ── Footer ──────────────────────────────────────────────── */
footer {
  position: relative; z-index: 2;
  border-top: 1px solid var(--rule-soft);
  padding: 36px 32px;
  max-width: 1180px;
  margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-soft);
}
footer a { color: inherit; text-decoration: none; }
footer a:hover { color: var(--ink); }
footer .links { display: flex; gap: 24px; }

.footer-mark { display: inline-flex; align-items: center; justify-content: center; }
.footer-mark svg { display: block; overflow: visible; }
.footer-mark rect { fill: none; stroke: var(--ink-soft); stroke-width: 0.7; }
.footer-mark rect.accent { stroke: var(--accent); stroke-width: 0.9; }
.footer-mark .core { fill: var(--accent); }
.footer-mark .ring { transform-origin: 18px 18px; }
.footer-mark .r1 { animation: spin-cw 24s linear infinite; }
.footer-mark .r2 { animation: spin-ccw 18s linear infinite; }
.footer-mark .r3 { animation: spin-cw 12s linear infinite; }
.footer-mark .r4 { animation: spin-ccw 8s linear infinite; }
.footer-mark .core { animation: pulse-core 3.4s ease-in-out infinite; transform-origin: 18px 18px; }
@keyframes spin-cw  { to { transform: rotate(360deg); } }
@keyframes spin-ccw { to { transform: rotate(-360deg); } }
@keyframes pulse-core {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50%      { opacity: 1;   transform: scale(1.6); }
}

@media (max-width: 720px) {
  .entry-title { font-size: 42px; }
  .entry-sub { font-size: 18px; }
  .entry-body { font-size: 17px; }
  .entry-body p.lede { font-size: 19px; }
  .entry-nav { grid-template-columns: 1fr; }
  .entry-nav .next { text-align: left; }

  /* mobile chrome: tighter brand, no hero overlay text, no footer meta line */
  .brand-suffix { display: none; }
  .hero-overlay { display: none; }
  .footer-meta  { display: none; }
}