/* Flash Archive (preview) — restrained "historical archive meets working
   studio" direction: warm paper ground, ink-black type, a single flash-red
   accent used sparingly. No gradients, no drop shadows for their own sake,
   no novelty-tattoo tropes. */

:root {
  --paper: #f4efe6;
  --paper-raised: #fbf8f2;
  --ink: #201a14;
  --ink-soft: #4a4038;
  --line: #d8cdb9;
  --accent: #9c2b1f;      /* muted flash-sheet red, used sparingly */
  --accent-ink: #ffffff;
  --focus: #1758c9;
  --warn-bg: #fbeee9;
  --warn-border: #c98a76;
  --tag-bg: #e9e1d0;
  --spot-gold: #9a6810;
  --spot-green: #286148;

  /* Diagram colours remain fixed so "black / skin / colour" keeps its
     meaning when the surrounding interface follows the system theme. */
  --diagram-paper: #f2e7d5;
  --diagram-black: #17130f;
  --diagram-red: #a93427;
  --diagram-gold: #c58b20;
  --diagram-green: #356b50;

  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --radius: 3px;
  --content-max: 62rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1b1712;
    --paper-raised: #241f18;
    --ink: #ece4d6;
    --ink-soft: #c7bba6;
    --line: #3c3428;
    --accent: #d9695a;
    --accent-ink: #1b1712;
    --focus: #7fb0ff;
    --warn-bg: #2c2019;
    --warn-border: #7a4536;
    --tag-bg: #2a2419;
    --spot-gold: #d2a247;
    --spot-green: #70ae8d;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  color: var(--ink);
  text-wrap: balance;
}

a { color: var(--accent); text-decoration-thickness: 1.5px; text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2.5px; }

figure { margin: 0; }

.wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--ink);
  color: var(--paper);
  padding: 0.75rem 1rem;
  z-index: 100;
  border-radius: var(--radius);
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

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

/* --- header --- */
.site-header {
  border-bottom: 6px solid var(--accent);
  background: var(--diagram-black);
}
.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
}
.site-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--diagram-paper);
  text-decoration: none;
}
.site-title__tag {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--diagram-gold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  font-size: 0.95rem;
}
.site-nav a {
  color: var(--diagram-paper);
  font-weight: 650;
  text-decoration: none;
  text-underline-offset: 0.3em;
}
.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--diagram-paper);
  text-decoration: underline;
  text-decoration-color: var(--diagram-red);
  text-decoration-thickness: 3px;
}
.site-header :focus-visible { outline-color: var(--diagram-gold); }
.site-grammar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  flex: 1 0 100%;
  gap: 1rem;
  align-items: center;
  border-top: 1px solid #4e463d;
  color: var(--diagram-paper);
  padding-top: 0.65rem;
}
.site-grammar__label {
  color: var(--diagram-gold);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.site-grammar ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-grammar li {
  position: relative;
  padding-left: 0.8rem;
  font-size: 0.73rem;
  font-weight: 650;
  letter-spacing: 0.035em;
}
.site-grammar li::before {
  position: absolute;
  top: 0.45em;
  left: 0;
  width: 0.35rem;
  height: 0.35rem;
  background: var(--diagram-red);
  content: "";
}

/* --- footer --- */
.site-footer {
  border-top: 6px solid var(--accent);
  margin-top: 4rem;
  padding: 1.5rem 0 3rem;
  background: var(--diagram-black);
  color: var(--diagram-paper);
  font-size: 0.9rem;
}
.site-footer a { color: var(--diagram-gold); }
.site-footer__meta { font-size: 0.8rem; opacity: 0.85; }

/* --- generic page sections --- */
.page-section {
  padding: 3rem 0;
}
.page-section + .page-section {
  border-top: 1px solid var(--line);
}
.content-page {
  padding-top: 3.5rem;
}
.content-page > h1 {
  max-width: 46rem;
  margin: 0 0 2rem;
  border-left: 8px solid var(--ink);
  padding-left: 1rem;
  font-size: clamp(2.4rem, 5vw, 4rem);
}
.content-page > h2 {
  max-width: 46rem;
  margin-top: 3rem;
  border-top: 4px solid var(--ink);
  padding-top: 0.75rem;
}
.content-page > p,
.content-page > ul,
.content-page > ol {
  max-width: 46rem;
}
.hero {
  padding: 3.5rem 0 2.5rem;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin: 0 0 0.75rem;
}
.hero p.lede {
  max-width: 42rem;
  font-size: 1.1rem;
  color: var(--ink-soft);
}

.eyebrow,
.archive-label,
.card-index {
  margin: 0 0 0.65rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.35;
  text-transform: uppercase;
}

.archive-label {
  display: block;
  width: fit-content;
  border-bottom: 2px solid var(--accent);
  color: var(--ink-soft);
  padding-bottom: 0.2rem;
}

.section-heading {
  position: relative;
  margin-bottom: 1.75rem;
  border-left: 5px solid var(--ink);
  padding-left: 1rem;
}
.section-heading h2 {
  max-width: 44rem;
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.45rem);
}
.section-heading > p:last-child,
.section-heading--split > p {
  max-width: 39rem;
  margin: 0.75rem 0 0;
  color: var(--ink-soft);
}
.section-heading--split {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(17rem, 0.8fr);
  gap: 2rem;
  align-items: end;
}
.section-heading--split > p { margin: 0; }
.section-intro {
  max-width: 44rem;
  color: var(--ink-soft);
}

.button-link {
  display: inline-block;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  letter-spacing: 0.045em;
  padding: 0.75rem 1rem;
  text-decoration: none;
  text-transform: uppercase;
}
.button-link:hover,
.button-link:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
  text-decoration: underline;
}
.text-link { font-weight: 650; }

/* --- research-led homepage --- */
.hero--study { padding: 4.5rem 0 3.5rem; }
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(18rem, 0.7fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
.hero__copy {
  border-left: 8px solid var(--ink);
  padding-left: clamp(1rem, 3vw, 2rem);
}
.hero--study h1 {
  max-width: 45rem;
  font-size: clamp(2.6rem, 5.5vw, 4.6rem);
  letter-spacing: -0.025em;
  line-height: 0.98;
}
.hero--study p.lede {
  max-width: 43rem;
  margin-top: 1.25rem;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.25rem;
  align-items: center;
  margin-top: 1.75rem;
}

.study-sheet {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  padding: 1.5rem;
}
.study-sheet::before {
  position: absolute;
  top: -1px;
  left: 1.5rem;
  width: 4rem;
  border-top: 4px solid var(--accent);
  content: "";
}
.hero-diagram h2 {
  margin: 0 0 1.35rem;
  font-size: 1.5rem;
}
.hero-sequence {
  margin: 0;
  padding: 0;
  list-style: none;
}
.hero-sequence li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  border-top: 1px solid var(--line);
  padding: 0.65rem 0;
  font-weight: 650;
}
.hero-sequence li:first-child { border-top: 4px solid var(--ink); }
.hero-sequence li:nth-child(2) { border-top-width: 3px; }
.hero-sequence li:nth-child(3) { border-top-style: dashed; }
.hero-sequence li:nth-child(4) { border-top-color: var(--accent); }
.hero-sequence li:nth-child(5) { border-top-width: 1px; }
.hero-sequence span {
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}
.diagram-note {
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.research-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.research-card {
  border: 1px solid var(--line);
  border-top: 6px solid var(--ink);
  background: var(--paper-raised);
  padding: 1.35rem;
}
.research-card--space { border-top-color: var(--spot-gold); }
.research-card--syntax { border-top-color: var(--accent); }
.research-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.3rem;
}
.research-card > p:last-child {
  margin-bottom: 0;
  color: var(--ink-soft);
}
.motif-system {
  display: grid;
  grid-template-columns: minmax(14rem, 0.65fr) minmax(0, 1.35fr);
  gap: 1.25rem 2rem;
  align-items: center;
  margin-top: 1rem;
}
.motif-system figcaption h3 {
  margin: 0;
  font-size: 1.45rem;
}
.motif-system__grid {
  display: grid;
  grid-template-columns: minmax(7rem, 0.65fr) auto minmax(13rem, 1.35fr);
  gap: 0.75rem;
  align-items: stretch;
}
.motif-system__grid > div {
  display: flex;
  min-height: 7.5rem;
  border: 1px solid var(--line);
  border-top: 5px solid var(--ink);
  background: var(--paper);
  padding: 0.9rem;
  flex-direction: column;
}
.motif-system__grid > div:last-child { border-top-color: var(--accent); }
.motif-system__grid > b { align-self: center; color: var(--accent); font-size: 1.5rem; }
.motif-system__grid span,
.motif-system__grid small { color: var(--ink-soft); font-size: 0.72rem; }
.motif-system__grid span { font-weight: 750; letter-spacing: 0.08em; text-transform: uppercase; }
.motif-system__grid strong { margin-top: auto; font-family: var(--font-display); font-size: 1.05rem; }
.motif-system .diagram-note { grid-column: 1 / -1; margin-top: 0; }
.section-action { margin: 1.5rem 0 0; font-weight: 700; }

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.comparison-panel {
  border: 1px solid var(--line);
  border-left: 5px solid var(--ink);
  background: var(--paper-raised);
  padding: 1.35rem 1.5rem;
}
.comparison-panel--variable { border-left-color: var(--accent); }
.plain-list {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.plain-list li {
  position: relative;
  padding-left: 1.1rem;
}
.plain-list li::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  content: "—";
}

/* --- visual-language exhibition --- */
.visual-language-page { --study-rule: 1px solid var(--line); }
.exhibition-header {
  padding: 4.75rem 0 4rem;
  border-bottom: var(--study-rule);
}
.exhibition-header h1 {
  max-width: 52rem;
  margin: 0;
  font-size: clamp(2.7rem, 5.6vw, 5rem);
  letter-spacing: -0.025em;
  line-height: 0.98;
}
.exhibition-header .lede {
  max-width: 46rem;
  margin: 1.5rem 0 0;
  color: var(--ink-soft);
  font-size: 1.2rem;
}
.interpretation-note {
  display: grid;
  grid-template-columns: 10rem minmax(0, 1fr);
  gap: 1.25rem;
  max-width: 46rem;
  margin-top: 2rem;
  border-left: 4px solid var(--accent);
  background: var(--paper-raised);
  padding: 1rem 1.25rem;
}
.interpretation-note strong { font-family: var(--font-display); font-size: 1.1rem; }
.interpretation-note p { margin: 0; color: var(--ink-soft); }

.exhibition-section {
  padding: 4.5rem 0;
  border-bottom: var(--study-rule);
}
.exhibition-section:last-child { border-bottom: 0; }

.layer-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.layer-grid li {
  display: flex;
  min-height: 11.5rem;
  border: 1px solid var(--line);
  border-top: 5px solid var(--ink);
  background: var(--paper-raised);
  padding: 1rem;
  flex-direction: column;
}
.layer-grid li:nth-child(2) { border-top-color: var(--accent); }
.layer-grid li:nth-child(3) { border-top-color: var(--spot-gold); }
.layer-grid li:nth-child(4) { border-top-color: var(--spot-green); }
.layer-grid li:nth-child(5) { border-top-style: double; }
.layer-grid span {
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.layer-grid strong { margin-top: auto; font-family: var(--font-display); font-size: 1.15rem; }
.layer-grid small { display: block; margin-top: 0.45rem; color: var(--ink-soft); line-height: 1.35; }

.vocabulary-study {
  margin-top: 1rem;
}
.vocabulary-study figcaption {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}
.vocabulary-study figcaption strong {
  max-width: 38rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.25;
}
.vocabulary-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.vocabulary-map > div {
  border-top: 5px solid var(--ink);
  background: var(--paper);
  padding: 1rem;
}
.vocabulary-map > div:nth-child(2) { border-top-color: var(--accent); }
.vocabulary-map > div:nth-child(3) { border-top-color: var(--spot-gold); }
.vocabulary-map span {
  display: block;
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.vocabulary-map strong { display: block; margin-top: 1.5rem; font-family: var(--font-display); }

.recognition-study figcaption {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.recognition-study figcaption strong {
  max-width: 38rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  line-height: 1.2;
}
.silhouette-field {
  position: relative;
  min-height: 18rem;
  overflow: hidden;
  border: 1px solid #c7b99e;
  background: var(--diagram-paper);
}
.silhouette-mark { position: absolute; display: block; background: var(--diagram-black); }
.silhouette-mark--left {
  top: 24%;
  left: 8%;
  width: 43%;
  height: 55%;
  clip-path: polygon(0 62%, 100% 0, 82% 100%);
}
.silhouette-mark--centre {
  z-index: 2;
  top: 27%;
  left: 38%;
  width: 24%;
  aspect-ratio: 1;
  border-radius: 50% 50% 45% 45%;
}
.silhouette-mark--right {
  top: 24%;
  right: 8%;
  width: 43%;
  height: 55%;
  clip-path: polygon(0 0, 100% 62%, 18% 100%);
}
.recognition-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.85rem;
}
.recognition-notes span {
  border-top: 3px solid var(--ink);
  padding-top: 0.5rem;
  font-size: 0.82rem;
  font-weight: 700;
}
.principle-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.principle-pair article { border-top: 1px solid var(--line); padding: 1.25rem 0 0; }
.principle-pair h3 { margin: 0 0 0.5rem; }
.principle-pair article > p:last-child { color: var(--ink-soft); }

.build-study {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.25rem 0;
}
.build-sequence {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}
.build-stage { min-width: 0; }
.stage-visual {
  position: relative;
  height: 11rem;
  overflow: hidden;
  border: 1px solid #c7b99e;
  background: var(--diagram-paper);
}
.stage-visual span { position: absolute; display: block; background: var(--diagram-black); }
.stage-visual span:first-child {
  z-index: 2;
  top: 28%;
  left: 34%;
  width: 32%;
  aspect-ratio: 1;
  border-radius: 50%;
}
.stage-visual span:nth-child(2) {
  top: 24%;
  left: 8%;
  width: 48%;
  height: 55%;
  clip-path: polygon(0 60%, 100% 0, 78% 100%);
}
.stage-visual span:nth-child(3) {
  top: 24%;
  right: 8%;
  width: 48%;
  height: 55%;
  clip-path: polygon(0 0, 100% 60%, 22% 100%);
}
.build-stage--black .stage-visual span:first-child {
  border: 12px solid var(--diagram-black);
  background: var(--diagram-paper);
}
.build-stage--black .stage-visual span:nth-child(3) { background: var(--diagram-paper); border: 8px solid var(--diagram-black); }
.build-stage--space .stage-visual span:first-child { background: var(--diagram-paper); border: 8px solid var(--diagram-black); }
.build-stage--space .stage-visual span:nth-child(2) { width: 39%; }
.build-stage--space .stage-visual span:nth-child(3) { width: 39%; }
.build-stage--colour .stage-visual span:first-child { background: var(--diagram-red); }
.build-stage--colour .stage-visual span:nth-child(3) { background: var(--diagram-gold); }
.build-stage--detail .stage-visual span:first-child {
  border: 9px double var(--diagram-black);
  background: var(--diagram-red);
}
.build-stage--detail .stage-visual span:nth-child(3) { background: var(--diagram-green); }
.build-stage strong { display: block; margin-top: 0.65rem; font-family: var(--font-display); }
.build-stage small { display: block; color: var(--ink-soft); line-height: 1.3; }
.large-statement {
  max-width: 47rem;
  margin: 2.25rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.15rem);
  line-height: 1.25;
}

.rhythm-study { padding-top: 1.75rem; }
.colour-rhythm {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  min-height: 11rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}
.colour-rhythm li {
  display: flex;
  min-width: 0;
  padding: 1rem;
  flex-direction: column;
  justify-content: flex-end;
}
.colour-rhythm strong { font-family: var(--font-display); font-size: 1.25rem; }
.colour-rhythm span { font-size: 0.75rem; }
.rhythm-black { background: var(--diagram-black); color: var(--diagram-paper); }
.rhythm-skin { border: 1px solid #c7b99e; background: var(--diagram-paper); color: var(--diagram-black); }
.rhythm-red { background: var(--diagram-red); color: #fff8ee; }
.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.channel-grid article { border: 1px solid var(--line); background: var(--paper-raised); padding: 1rem; }
.channel-grid h3 { margin: 0.75rem 0 0.3rem; }
.channel-grid p { margin: 0; color: var(--ink-soft); font-size: 0.88rem; }
.channel-mark {
  position: relative;
  display: block;
  height: 5rem;
  overflow: hidden;
  background: var(--diagram-black);
}
.channel-mark::before { position: absolute; display: block; background: var(--diagram-paper); content: ""; }
.channel-mark--line::before { top: 0; left: 42%; width: 16%; height: 100%; }
.channel-mark--wedge::before { inset: 0; clip-path: polygon(42% 0, 58% 0, 78% 100%, 22% 100%); }
.channel-mark--highlight::before { top: 18%; left: 20%; width: 60%; height: 28%; border-radius: 50%; }
.channel-mark--gap::before { top: 38%; left: 0; width: 100%; height: 24%; }

.composition-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}
.composition-grid figure { border: 1px solid var(--line); background: var(--paper-raised); }
.composition-grid figcaption { display: flex; min-height: 8rem; padding: 1rem; flex-direction: column; }
.composition-grid figcaption strong { margin-top: auto; font-family: var(--font-display); font-size: 1.3rem; }
.composition-grid figcaption small { margin-top: 0.3rem; color: var(--ink-soft); }
.composition-mark {
  position: relative;
  height: 12rem;
  overflow: hidden;
  border-bottom: 1px solid #c7b99e;
  background: var(--diagram-paper);
}
.composition-mark::before,
.composition-mark::after { position: absolute; display: block; content: ""; }
.composition-mark--roundel::before {
  top: 18%; left: 29%; width: 42%; aspect-ratio: 1;
  border: 18px solid var(--diagram-black); border-radius: 50%;
}
.composition-mark--roundel::after {
  top: 38%; left: 42%; width: 16%; aspect-ratio: 1;
  border-radius: 50%; background: var(--diagram-red);
}
.composition-mark--head::before {
  top: 15%; left: 36%; width: 28%; aspect-ratio: 1;
  border-radius: 48% 48% 43% 43%; background: var(--diagram-black);
}
.composition-mark--head::after {
  bottom: 12%; left: 22%; width: 56%; height: 40%;
  border-top: 12px solid var(--diagram-red); background: var(--diagram-black);
  clip-path: polygon(25% 0, 75% 0, 100% 100%, 0 100%);
}
.composition-mark--spread::before {
  top: 24%; left: 10%; width: 80%; height: 58%;
  background: var(--diagram-black);
  clip-path: polygon(0 46%, 43% 0, 50% 27%, 57% 0, 100% 46%, 64% 100%, 50% 70%, 36% 100%);
}
.composition-mark--spread::after {
  top: 36%; left: 44%; width: 12%; aspect-ratio: 1;
  border-radius: 50%; background: var(--diagram-red);
}
.composition-mark--vertical::before {
  top: 8%; left: 46%; width: 8%; height: 84%;
  background: var(--diagram-black); clip-path: polygon(50% 0, 100% 16%, 70% 82%, 50% 100%, 30% 82%, 0 16%);
}
.composition-mark--vertical::after {
  top: 32%; left: 28%; width: 44%; height: 36%;
  border: 13px solid var(--diagram-red); border-radius: 50%;
}
.composition-mark--curve::before {
  top: 9%; left: 32%; width: 35%; height: 76%;
  border: 18px solid transparent; border-left-color: var(--diagram-black); border-radius: 50%;
  transform: rotate(-18deg);
}
.composition-mark--curve::after {
  top: 18%; left: 38%; width: 33%; height: 68%;
  border: 13px solid transparent; border-right-color: var(--diagram-red); border-radius: 50%;
  transform: rotate(-18deg);
}
.composition-mark--banner::before {
  top: 20%; left: 34%; width: 32%; aspect-ratio: 1;
  border: 16px solid var(--diagram-black); border-radius: 50%;
}
.composition-mark--banner::after {
  top: 48%; left: 14%; width: 72%; height: 22%;
  background: var(--diagram-red); clip-path: polygon(0 10%, 15% 25%, 15% 0, 85% 0, 85% 25%, 100% 10%, 94% 100%, 6% 100%);
}
.composition-mark--bilateral::before {
  top: 31%; left: 20%; width: 25%; aspect-ratio: 1;
  border-radius: 50% 50% 20% 50%; background: var(--diagram-black); transform: rotate(-20deg);
}
.composition-mark--bilateral::after {
  top: 31%; right: 20%; width: 25%; aspect-ratio: 1;
  border-radius: 50% 50% 50% 20%; background: var(--diagram-red); transform: rotate(20deg);
}
.composition-mark--crossed::before,
.composition-mark--crossed::after {
  top: 15%; left: 44%; width: 12%; height: 72%;
  background: var(--diagram-black);
  transform: rotate(43deg);
}
.composition-mark--crossed::after {
  background: var(--diagram-red);
  transform: rotate(-43deg);
}

.syntax-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}
.syntax-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 0.5rem;
  align-items: center;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  padding: 1rem;
  text-align: center;
}
.syntax-card span {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
}
.syntax-card b { color: var(--accent); font-size: 1.3rem; }
.syntax-card strong {
  grid-column: 1 / -1;
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.text-lockup {
  display: grid;
  grid-template-columns: minmax(17rem, 0.8fr) minmax(0, 1.2fr);
  gap: 1.5rem;
  align-items: center;
  margin-top: 1rem;
  padding-top: 2.25rem;
}
.text-lockup figcaption { grid-column: 1 / -1; }
.text-lockup__mark {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.5rem;
  align-items: center;
  border: 1px solid #c7b99e;
  background: var(--diagram-paper);
  color: var(--diagram-black);
  padding: 1.25rem;
  text-align: center;
}
.text-lockup__mark span { border: 4px solid var(--diagram-black); padding: 1rem 0.5rem; font-family: var(--font-display); font-weight: 700; }
.text-lockup__mark span:last-child { border-color: var(--diagram-red); }
.text-lockup__mark b { color: var(--diagram-red); }
.text-lockup > p { color: var(--ink-soft); }

.edit-list { border-top: 1px solid var(--line); }
.edit-list > div {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr);
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
}
.edit-list span { color: var(--accent); font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; }
.edit-list strong { font-family: var(--font-display); font-size: 1.2rem; }

.pipeline-study { border: 1px solid var(--line); background: var(--paper-raised); padding: 1.25rem; }
.pipeline {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}
.pipeline li {
  position: relative;
  min-height: 9rem;
  border-top: 4px solid var(--ink);
  border-right: 1px solid var(--line);
  padding: 1rem 0.8rem;
}
.pipeline li:nth-child(2), .pipeline li:nth-child(5) { border-top-color: var(--accent); }
.pipeline li:nth-child(3) { border-top-color: var(--spot-gold); }
.pipeline li:nth-child(4) { border-top-color: var(--spot-green); }
.pipeline li:last-child { border-right: 0; }
.pipeline span { color: var(--ink-soft); font-size: 0.72rem; font-weight: 700; }
.pipeline strong { display: block; margin-top: 1.5rem; font-family: var(--font-display); }
.pipeline small { display: block; color: var(--ink-soft); line-height: 1.3; }

.circulation-study {
  margin-top: 1rem;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  padding: 1.25rem;
}
.circulation-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.circulation-grid article {
  min-height: 10rem;
  border: 1px solid var(--line);
  border-top: 5px solid var(--ink);
  background: var(--paper);
  padding: 1rem;
}
.circulation-grid article:nth-child(2) { border-top-color: var(--accent); }
.circulation-grid article:nth-child(3) { border-top-color: var(--spot-gold); }
.circulation-grid article:nth-child(4) { border-top-color: var(--spot-green); }
.circulation-grid span {
  display: block;
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.circulation-grid strong { display: block; margin-top: 1.5rem; font-family: var(--font-display); }

.variation-study {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  padding: 1.25rem;
}
.variation-study figcaption {
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}
.variation-study figcaption strong {
  max-width: 40rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1.25;
}
.variation-panels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.variation-panels article {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.75rem;
}
.variation-panels h3 { margin: 0.75rem 0 0.25rem; }
.variation-panels p { margin: 0; color: var(--ink-soft); font-size: 0.86rem; }
.variation-mark {
  position: relative;
  height: 10rem;
  overflow: hidden;
  border: 1px solid #c7b99e;
  background: var(--diagram-paper);
}
.variation-mark::before,
.variation-mark::after {
  position: absolute;
  display: block;
  border-radius: 50%;
  content: "";
}
.variation-mark::before {
  top: 16%;
  left: 28%;
  width: 44%;
  aspect-ratio: 1;
  border: 4px solid var(--diagram-black);
}
.variation-mark::after {
  top: 39%;
  left: 45%;
  width: 10%;
  aspect-ratio: 1;
  background: var(--diagram-red);
}
.variation-mark--moderate::before { border-width: 11px; }
.variation-mark--moderate::after { top: 34%; left: 40%; width: 20%; }
.variation-mark--dense::before { border-width: 20px; }
.variation-mark--dense::after {
  top: 29%;
  left: 36%;
  width: 28%;
  border: 7px solid var(--diagram-paper);
  background: var(--diagram-black);
}

.comparison-grid--final { margin-top: 2rem; }
.closing-note {
  margin-top: 1rem;
  border: 1px dashed var(--line);
  background: var(--paper-raised);
  padding: 1.25rem 1.5rem;
}
.closing-note > p:not(.archive-label) { max-width: 48rem; }

.callout {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}

.callout--warn {
  background: var(--warn-bg);
  border-color: var(--warn-border);
}

/* --- empty state --- */
.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  background: var(--paper-raised);
}
.empty-state h2,
.empty-state h3 { margin-top: 0; }
.empty-state p { max-width: 34rem; margin: 0.5rem auto 0; color: var(--ink-soft); }

/* --- search --- */
.search-panel {
  margin: 1.5rem 0 2.5rem;
}
.search-panel label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.search-panel input[type="search"] {
  width: 100%;
  max-width: 32rem;
  font-size: 1rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  color: var(--ink);
}
.search-status {
  margin-top: 0.5rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.record-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.record-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  padding: 1.1rem 1.2rem;
}
.record-card h3 { margin: 0 0 0.35rem; font-size: 1.1rem; }
.record-card a { text-decoration: none; }
.record-card a:hover { text-decoration: underline; }
.record-card__meta { color: var(--ink-soft); font-size: 0.88rem; margin: 0.2rem 0; }

.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--ink-soft);
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  margin: 0.15rem 0.3rem 0 0;
}

.badge-uncertain {
  display: inline-block;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--ink);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius);
}

/* --- record detail --- */
.record-detail h1 { margin-bottom: 0.25rem; }
.record-detail dl {
  display: grid;
  grid-template-columns: minmax(9rem, 14rem) 1fr;
  gap: 0.5rem 1rem;
  margin: 1.5rem 0;
}
.record-detail dt { color: var(--ink-soft); font-weight: 600; }
.record-detail dd { margin: 0; }
.record-detail img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* --- newsletter placeholder --- */
.newsletter-placeholder {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  justify-content: space-between;
}
.newsletter-placeholder input,
.newsletter-placeholder button {
  font-size: 0.95rem;
}
.newsletter-placeholder input {
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink-soft);
}
.newsletter-placeholder button {
  padding: 0.5rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--tag-bg);
  color: var(--ink-soft);
  cursor: not-allowed;
}

/* --- checklist / list styling on content pages --- */
.content-page ol, .content-page ul { padding-left: 1.4rem; }
.content-page li { margin: 0.4rem 0; }

/* --- reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- responsive --- */
@media (max-width: 52rem) {
  .hero__grid,
  .section-heading--split,
  .text-lockup,
  .motif-system {
    grid-template-columns: 1fr;
  }
  .section-heading--split > p { margin-top: 0.75rem; }
  .layer-grid,
  .build-sequence,
  .research-card-grid,
  .composition-grid,
  .pipeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .channel-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .vocabulary-map,
  .circulation-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pipeline li:nth-child(2n) { border-right: 0; }
  .pipeline li:nth-child(3) { border-right: 1px solid var(--line); }
  .text-lockup figcaption { grid-column: 1; }
}

@media (max-width: 40rem) {
  .site-header__inner { flex-direction: column; align-items: flex-start; }
  .site-nav { gap: 0.65rem 1rem; font-size: 0.88rem; }
  .site-grammar { grid-template-columns: 1fr; gap: 0.4rem; }
  .site-grammar ul { gap: 0.3rem 0.85rem; }
  .hero--study,
  .exhibition-header { padding-top: 3rem; }
  .hero--study h1,
  .exhibition-header h1 { font-size: clamp(2.45rem, 12vw, 3.4rem); }
  .research-card-grid,
  .comparison-grid,
  .layer-grid,
  .build-sequence,
  .recognition-study figcaption,
  .principle-pair,
  .channel-grid,
  .composition-grid,
  .syntax-grid,
  .pipeline,
  .interpretation-note,
  .motif-system__grid,
  .vocabulary-study figcaption,
  .vocabulary-map,
  .circulation-grid,
  .variation-study figcaption,
  .variation-panels {
    grid-template-columns: 1fr;
  }
  .motif-system__grid > b { transform: rotate(90deg); }
  .exhibition-section { padding: 3.25rem 0; }
  .layer-grid li { min-height: 8rem; }
  .recognition-notes { grid-template-columns: 1fr; }
  .stage-visual { height: 14rem; }
  .pipeline li,
  .pipeline li:nth-child(2n),
  .pipeline li:nth-child(3) {
    min-height: 7rem;
    border-right: 0;
  }
  .edit-list > div { grid-template-columns: 6.5rem minmax(0, 1fr); }
  .colour-rhythm { min-height: 9rem; }
  .colour-rhythm li { padding: 0.65rem 0.45rem; }
  .colour-rhythm strong { font-size: 1rem; }
  .record-detail dl { grid-template-columns: 1fr; }
}