/* ─── Exeud · the experiential web ────────────────────────────────────────────
   A working-papers aesthetic: ink on paper, hairline rules, numbered sections.
   No gradients, no cards, no rounded corners, no webfonts. The reader's own
   serif carries the text; a single rubric red does the pointing.            */

:root {
  --paper: #f6f2e9;
  --ink: #1d1b16;
  --ink-faint: #5d574b;
  --rubric: #7c2d12;       /* madder red — the traditional margin colour */
  --rule: #c9c2b2;
  --rule-heavy: #1d1b16;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #181612;
    --ink: #e8e2d4;
    --ink-faint: #99917f;
    --rubric: #d97757;
    --rule: #3a362d;
    --rule-heavy: #e8e2d4;
  }
}

* { box-sizing: border-box; }

html {
  background: var(--paper);
}

body {
  margin: 0 auto;
  padding: 4.5rem 1.5rem 3rem;
  max-width: 42rem;
  color: var(--ink);
  font-family: Charter, 'Bitstream Charter', 'Sitka Text', Cambria, Georgia, serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'onum' 1, 'liga' 1;
}

/* ── Rules ── */

.rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

.rule-heavy {
  border-top: 2px solid var(--rule-heavy);
}

/* ── Masthead ── */

.masthead {
  margin-bottom: 3rem;
}

.masthead-series {
  font-family: 'Iosevka', 'Berkeley Mono', ui-monospace, 'Cascadia Code', Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rubric);
  margin: 0 0 2.25rem;
}

.title-row {
  display: flex;
  align-items: baseline;
  gap: 0;
  margin: 0 0 0.5rem;
}

.masthead h1 {
  font-size: 3.25rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  margin: 0;
  line-height: 1;
  flex-shrink: 0;
}

.masthead-subtitle {
  font-style: italic;
  font-size: 1.25rem;
  color: var(--ink-faint);
  margin: 0.5rem 0 2rem;
}

.masthead .rule-heavy {
  margin: 0;
}

.pron-inline {
  display: inline-flex;
  align-items: baseline;
  gap: 0.8em;
  margin-left: 2.2em;
  font-size: 0.28em;
  font-weight: 400;
  font-style: normal;
  vertical-align: middle;
  position: relative;
  top: 0.4em;
}

.audio-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-size: 1em;
  line-height: 1.5;
  opacity: 0.55;
  transition: opacity 0.12s;
}

.audio-btn:hover {
  opacity: 1;
}

.pron-label {
  font-family: inherit;
  font-size: 0.85em;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  margin-left: 0.1em;
}

.ipa-text {
  font-family: 'Iosevka', 'Berkeley Mono', ui-monospace, 'Cascadia Code', Menlo, monospace;
  font-size: 0.9em;
  letter-spacing: 0.01em;
  color: var(--paper);
  transition: color 0.25s ease-in;
}

.ipa-text.ipa-playing {
  color: var(--ink-faint);
  transition: color 0.1s ease-out;
}

.rsvp-field {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-family: 'Iosevka', 'Berkeley Mono', ui-monospace, 'Cascadia Code', Menlo, monospace;
  letter-spacing: 0.03em;
  padding-bottom: 0.1em;
}

#rsvp-display {
  color: var(--paper);
  transition: color 0.18s ease-in;
}

#rsvp-display.rsvp-on {
  color: var(--ink-faint);
  transition: color 0.06s ease-out;
}

/* ── Sections ── */

section {
  margin: 2.5rem 0;
}

h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 0.75rem;
}

.section-no {
  display: inline-block;
  min-width: 1.6rem;
  color: var(--rubric);
  font-weight: 400;
}

.section-label {
  font-family: ui-monospace, 'Cascadia Code', Menlo, monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

p {
  margin: 0 0 1rem;
}

p:last-child {
  margin-bottom: 0;
}

em, q {
  font-style: italic;
}

.abstract p {
  font-size: 0.97rem;
  line-height: 1.7;
  padding-left: 1.6rem;
  border-left: 2px solid var(--rule);
}

/* ── Definition list: the four quantities ── */

.quantities {
  margin: 1.25rem 0 0;
}

.quantities dt {
  font-variant: small-caps;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  color: var(--rubric);
  margin-top: 1.25rem;
}

.quantities dd {
  margin: 0.25rem 0 0 1.6rem;
}

/* ── Lists ── */

.method-list {
  margin: 0 0 1rem;
  padding-left: 1.6rem;
}

.method-list li {
  margin-bottom: 0.9rem;
}

.participation {
  list-style: none;
  margin: 0;
  padding-left: 1.6rem;
}

.participation li {
  margin-bottom: 0.4rem;
  text-indent: -1.6rem;
}

.participation li::before {
  content: '—';
  color: var(--rubric);
  margin-right: 0.75rem;
}

/* ── Links: classic underline, no decoration games ── */

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rubric);
  text-underline-offset: 2px;
}

a:hover {
  color: var(--rubric);
}

/* ── Closing ── */

.closing p {
  font-style: italic;
  text-align: center;
  max-width: 34rem;
  margin: 0 auto;
  color: var(--ink-faint);
}

.closing em {
  font-style: normal;
}

/* ── Colophon ── */

.colophon {
  margin-top: 3.5rem;
  text-align: center;
}

.colophon .rule-heavy {
  margin-bottom: 1.5rem;
}

.colophon p {
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

.colophon-note {
  font-size: 0.78rem;
  color: var(--ink-faint);
  font-style: italic;
}

/* ── Small screens ── */

@media (max-width: 480px) {
  body {
    padding-top: 3rem;
    font-size: 1rem;
  }
  .masthead h1 {
    font-size: 2.5rem;
  }
}