/*
  Architectural drawing shell
  Owns: palette, fonts, body grid, .wrap, top nav, sheet-meta, footer chrome.
  Pages own their per-page layout below the chrome.
  Pages may override --max-content for narrow reading widths via .wrap-narrow.
*/

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

/*
  Design tokens with !important — shell wins over per-page :root drift.
  Palette and fonts are uniform across the site, no per-page negotiation.
  Content-width tokens (--max, --pad) intentionally NOT !important so essay
  pages can use a narrower reading column.
*/
:root {
  --paper: #F4F1EA !important;
  --paper-warm: #EFEBE2 !important;
  --paper-elevated: #FBF8F0 !important;
  --ink: #2B2B2B !important;
  --ink-2: #4A4A4A !important;
  --ink-3: #7A7A7A !important;
  --ink-4: #B5B0A4 !important;
  --rule: rgba(43,43,43,0.16) !important;
  --rule-2: rgba(43,43,43,0.30) !important;
  --grid: rgba(43,43,43,0.06) !important;
  --blueprint: #1E3A8A !important;
  --blueprint-soft: rgba(30,58,138,0.08) !important;
  --blueprint-deep: #0B1E50 !important;
  --pencil: #DC2626 !important;
  --pencil-soft: rgba(220,38,38,0.10) !important;
  --green: #16653A !important;
  --green-soft: rgba(22,101,58,0.10) !important;
  --display: 'Newsreader', Georgia, serif !important;
  --body: 'Inter Tight', -apple-system, BlinkMacSystemFont, sans-serif !important;
  --mono: 'JetBrains Mono', ui-monospace, Menlo, monospace !important;
  --max-chrome: 1280px !important;

  /* Page-overridable */
  --pad: clamp(16px, 4vw, 56px);
  --max: 1280px;
  --max-content: 920px;
  --max-narrow: 680px;
  --grid-unit: 8px;

  /* Legacy aliases — pages reference these names; force them to point at new palette */
  --line: rgba(43,43,43,0.16) !important;
  --line-2: rgba(43,43,43,0.30) !important;
  --sienna: #1E3A8A !important;
  --sienna-soft: rgba(30,58,138,0.08) !important;
  --sienna-deep: #0B1E50 !important;
  --paper-2: #EFEBE2 !important;
  --accent: #1E3A8A !important;
}

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: var(--grid-unit) var(--grid-unit);
}

a { color: inherit; text-decoration: none; }
::selection { background: var(--blueprint); color: var(--paper); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); position: relative; }
.wrap-narrow { max-width: var(--max-content); margin: 0 auto; padding: 0 var(--pad); position: relative; }
.wrap-chrome { max-width: var(--max-chrome); margin: 0 auto; padding: 0 var(--pad); position: relative; }

@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }

/* ================================================================
   TOP NAV — shared chrome
   ================================================================ */
.nav {
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(6px);
}
/* Chrome containers (nav-inner, sheet-meta wrap, footer-row) ALWAYS use chrome
   width, never inherit per-page --max. Specificity bumped + !important to win
   over per-page inline .nav-inner / .wrap declarations. */
nav.nav > .wrap-chrome,
nav.nav > .wrap-chrome.nav-inner,
footer.site-footer > .wrap-chrome,
body > .wrap-chrome {
  max-width: var(--max-chrome) !important;
  padding: 0 var(--pad) !important;
  margin: 0 auto !important;
}
nav.nav > .wrap-chrome.nav-inner {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  gap: 24px !important;
  flex-wrap: nowrap !important;
  font-family: var(--mono) !important;
  font-size: 11px !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase !important;
  color: var(--ink-3) !important;
  height: auto !important;
}
@media (max-width: 980px) { nav.nav > .wrap-chrome.nav-inner { flex-wrap: wrap !important; } }
.nav-brand { color: var(--ink); font-weight: 600; display: inline-flex; align-items: center; }
.nav-brand .ss { display: inline-block; border: 1px solid var(--ink); padding: 2px 6px; margin-right: 8px; }
.nav-coords { color: var(--ink-3); }
.nav-coords .live { color: var(--pencil); }
.nav-coords .live::before {
  content: ""; display: inline-block; width: 6px; height: 6px;
  background: var(--pencil); border-radius: 50%;
  margin-right: 6px; vertical-align: 1px;
  animation: blink 2.4s ease-in-out infinite;
}
.nav-links { display: flex; gap: 22px; }
.nav-links a { transition: color 200ms; }
.nav-links a:hover, .nav-links a.is-active { color: var(--blueprint); }
@media (max-width: 760px) {
  .nav-coords { display: none; }
  .nav-links { gap: 14px; flex-wrap: wrap; }
}

/* ================================================================
   SHEET META — page header pattern
   ================================================================ */
.sheet-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 32px 0 28px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: end;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}
.sheet-meta .ref {
  color: var(--pencil);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 12px;
}
.sheet-meta .rev {
  text-align: right;
}
@media (max-width: 760px) {
  .sheet-meta { grid-template-columns: 1fr; gap: 6px; padding-bottom: 14px; }
  .sheet-meta .rev { text-align: left; }
}

/* Section sheet-num pattern (used inside content sections) */
.sheet-num { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); padding-top: 14px; }
.sheet-num strong { display: block; font-size: 22px; color: var(--ink); font-family: var(--display); font-style: italic; font-weight: 400; letter-spacing: -0.012em; margin-bottom: 4px; }

/* ================================================================
   FOOTER — legend + scale bar
   ================================================================ */
.site-footer {
  padding: 40px 0;
  border-top: 2px solid var(--ink);
  margin-top: 80px;
}
.site-footer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: end;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
@media (max-width: 720px) { .site-footer-row { grid-template-columns: 1fr; gap: 18px; } }

.legend { display: grid; gap: 6px; }
.legend .row { display: flex; gap: 12px; align-items: center; }
.legend .swatch { width: 28px; height: 12px; border: 1px solid var(--rule-2); position: relative; }
.legend .swatch.ink { background: var(--ink); }
.legend .swatch.pencil { background: var(--pencil); }
.legend .swatch.blueprint { background: var(--blueprint); }
.legend .swatch.dash { background: var(--paper); }
.legend .swatch.dash::after { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: var(--ink); }

.scale-bar { display: grid; gap: 6px; justify-items: end; }
.scale-bar .bar { display: flex; gap: 0; }
.scale-bar .seg { width: 24px; height: 8px; border: 1px solid var(--ink); border-right: none; }
.scale-bar .seg:last-child { border-right: 1px solid var(--ink); }
.scale-bar .seg.fill { background: var(--ink); }

.site-footer a { color: var(--blueprint); border-bottom: 1px solid currentColor; }
.site-footer .meta-line { margin-top: 18px; font-size: 10.5px; color: var(--ink-4); letter-spacing: 0.06em; padding-top: 14px; border-top: 1px dashed var(--rule); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}