/* Custogent — holding site
   Design tokens. Light palette on bare :root; dark redefines tokens only. */

:root {
  --ground:      #F1F2EF;
  --surface:     #FBFBF9;
  --ink:         #171A18;
  --ink-2:       #4C534E;
  --ink-3:       #636A65;
  --rule:        #D4D8D2;
  --accent:      #7B2D26;
  --accent-soft: #9C4A41;
  --focus:       #7B2D26;

  --measure: 34rem;
  --rail: 11.5rem;
  --gutter: 3rem;

  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:      #131614;
    --surface:     #1A1E1B;
    --ink:         #E9EBE6;
    --ink-2:       #A2A9A3;
    --ink-3:       #7C837D;
    --rule:        #2C322E;
    --accent:      #CD8074;
    --accent-soft: #E0A093;
    --focus:       #CD8074;
  }
}

:root[data-theme="dark"] {
  --ground:      #131614;
  --surface:     #1A1E1B;
  --ink:         #E9EBE6;
  --ink-2:       #A2A9A3;
  --ink-3:       #7C837D;
  --rule:        #2C322E;
  --accent:      #CD8074;
  --accent-soft: #E0A093;
  --focus:       #CD8074;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.band {
  height: 4px;
  background: var(--accent);
}

.doc {
  max-width: calc(var(--rail) + var(--gutter) + var(--measure) + 4rem);
  margin: 0 auto;
  padding: 0 2rem 5rem;
}

/* ---- masthead ---- */

.masthead {
  padding: 4.5rem 0 3rem;
  display: grid;
  gap: 1.75rem;
}

.wordmark {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  margin: 0;
  color: var(--ink);
}

.definition {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.55rem, 1.15rem + 1.7vw, 2.35rem);
  line-height: 1.28;
  letter-spacing: -0.012em;
  margin: 0;
  max-width: 22ch;
  text-wrap: balance;
}

/* ---- the quotation that is the thesis ---- */

.notice {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 2.25rem 0;
  display: grid;
  gap: 1.1rem;
  margin-bottom: 3rem;
}

.notice blockquote {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.5;
  max-width: 40ch;
}

.notice .cite {
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  max-width: 52ch;
}

/* ---- ruled sections with a citation rail ---- */

.row {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, var(--measure));
  column-gap: var(--gutter);
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0;
}

.row:first-of-type { border-top: 0; }

.rail {
  font-family: var(--mono);
  font-size: 0.68rem;
  line-height: 1.7;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 0.35rem;
}

.rail span {
  display: block;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

.body > * + * { margin-top: 1.1rem; }

h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.45rem;
  line-height: 1.32;
  letter-spacing: -0.008em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; color: var(--ink-2); }
p.lead { color: var(--ink); }

strong { font-weight: 600; color: var(--ink); }

.figure {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--ink);
}

/* ---- module list ---- */

dl.modules {
  margin: 1.4rem 0 0;
  display: grid;
  gap: 1.05rem;
}

dl.modules div {
  display: grid;
  gap: 0.15rem;
}

dl.modules dt {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.005em;
  color: var(--ink);
}

dl.modules dd {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.97rem;
  line-height: 1.55;
}

/* ---- contact ---- */

ul.addresses {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  font-size: 0.97rem;
}

ul.addresses li { color: var(--ink-2); }

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 1px;
}

.placeholder {
  border: 1px dashed var(--accent);
  padding: 0.85rem 1rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.65;
  color: var(--accent);
  background: var(--surface);
}

/* ---- colophon ---- */

.colophon {
  border-top: 1px solid var(--rule);
  padding-top: 1.75rem;
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.8;
  letter-spacing: 0.03em;
  color: var(--ink-3);
  display: grid;
  gap: 0.2rem;
}

/* ---- narrow ---- */

@media (max-width: 860px) {
  body { font-size: 16.5px; }
  .doc { padding: 0 1.4rem 4rem; }
  .masthead { padding: 3.25rem 0 2.25rem; }
  .row {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 1.1rem;
  }
  .rail { padding-top: 0; }
  .notice blockquote { font-size: 1.15rem; }
}