/* Colour — An Atlas in Twelve Rooms
   Gallery-white walls, ink type, and colour reserved for the exhibits. */

:root {
  --paper: #f4f1eb;
  --paper-2: #ebe7df;
  --card: #fbfaf7;
  --ink: #17150f;
  --ink-2: #48443c;
  --ink-3: #7c766b;
  --rule: #d8d2c6;
  --rule-2: #c3bcae;
  --accent: #b8442a;       /* vermilion, used only for citations and focus */
  --dark: #0d0d0f;
  --dark-2: #17171a;
  --dark-ink: #ebe7df;
  --dark-ink-2: #a19c92;
  --dark-rule: #2c2c30;

  --serif-display: 'Instrument Serif', 'Iowan Old Style', 'Palatino Linotype', Georgia, serif;
  --serif-text: 'Newsreader', 'Iowan Old Style', Georgia, serif;
  --sans: 'Instrument Sans', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --gutter: clamp(16px, 4vw, 56px);
  --max: 1400px;
  --measure: 36rem;
  --ease: cubic-bezier(.2, .7, .1, 1);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-text);
  font-size: clamp(1.06rem, 0.98rem + 0.3vw, 1.22rem);
  line-height: 1.62;
  font-optical-sizing: auto;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: #17150f; color: #f4f1eb; }
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.18em; text-decoration-color: var(--rule-2); transition: text-decoration-color .2s; }
a:hover { text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: .6em 1em; font-family: var(--sans); z-index: 100; }
.skip:focus { left: 8px; }
.vh { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── Type roles ───────────────────────────────────────────── */
.label, .kicker {
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-feature-settings: 'tnum';
}
.mono { font-family: var(--mono); font-size: .8em; letter-spacing: 0; font-feature-settings: 'tnum', 'zero'; }
em, i { font-style: italic; }
.smallcaps { font-variant-caps: all-small-caps; letter-spacing: .06em; }

/* ── Masthead ─────────────────────────────────────────────── */
.masthead {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 14px var(--gutter);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s, color .3s;
}
.masthead.scrolled { border-bottom-color: var(--rule); }
.masthead.on-dark { background: color-mix(in srgb, var(--dark) 82%, transparent); color: var(--dark-ink); border-bottom-color: var(--dark-rule); }
.masthead .brand { font-family: var(--serif-display); font-size: 1.35rem; line-height: 1; text-decoration: none; letter-spacing: -.01em; white-space: nowrap; }
.masthead .brand i { color: var(--ink-3); }
.masthead.on-dark .brand i { color: var(--dark-ink-2); }
.masthead nav { display: flex; gap: clamp(.9rem, 2.4vw, 2rem); align-items: center; }
.masthead nav a { font-family: var(--sans); font-size: .76rem; letter-spacing: .12em; text-transform: uppercase; text-decoration: none; font-weight: 500; }
.masthead .room-now { font-family: var(--sans); font-size: .76rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.masthead.on-dark .room-now { color: var(--dark-ink-2); }
@media (max-width: 720px) { .masthead .room-now { display: none; } .masthead nav a.opt { display: none; } }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  min-height: calc(100svh - 58px);
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  padding: clamp(24px, 4vw, 48px) var(--gutter) clamp(28px, 4vw, 48px);
  max-width: var(--max); margin: 0 auto;
  position: relative;
}
.hero-meta { display: flex; justify-content: space-between; gap: 1rem; color: var(--ink-3); flex-wrap: wrap; }
.hero-top { align-self: end; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 24px; }
.hero-object { margin: 2.4rem 0 .6rem; width: clamp(220px, 25vw, 380px); justify-self: end; }
.hero-object canvas { width: 100%; height: auto; aspect-ratio: 1; }
.hero-object figcaption { font-family: var(--sans); font-size: .76rem; line-height: 1.45; color: var(--ink-3); margin-top: .8rem; max-width: 26rem; }
.hero-object figcaption .label { display: block; color: var(--ink); margin-bottom: .25rem; }
@media (max-width: 760px) { .hero-top { grid-template-columns: 1fr; } .hero-object { justify-self: start; width: min(78vw, 320px); order: -1; margin-top: 1.2rem; } }
.hero-title {
  align-self: end;
  font-family: var(--serif-display);
  font-weight: 400;
  font-size: clamp(6rem, 23vw, 21rem);
  line-height: .8;
  letter-spacing: -.035em;
  margin: .25em 0 0 -.05em;
}
.hero-title .o { display: inline-block; position: relative; }
.hero-sub {
  display: grid; grid-template-columns: repeat(12, 1fr); gap: 0 24px; align-items: end;
  margin: clamp(1.5rem, 3vw, 2.5rem) 0 clamp(1.8rem, 4vw, 3.2rem);
}
.hero-sub h1 { grid-column: 1 / span 6; margin: 0; font-family: var(--serif-display); font-weight: 400; font-style: italic; font-size: clamp(1.9rem, 3.6vw, 3.4rem); line-height: 1.02; letter-spacing: -.01em; }
.hero-sub p { grid-column: 8 / span 5; margin: 0; color: var(--ink-2); font-size: 1.05em; }
@media (max-width: 860px) { .hero-sub h1, .hero-sub p { grid-column: 1 / -1; } .hero-sub p { margin-top: 1.2rem; } }

.spectrum-rule { position: relative; }
.spectrum-rule canvas { width: 100%; height: clamp(46px, 7vw, 86px); }
.spectrum-scale { display: flex; justify-content: space-between; margin-top: 10px; color: var(--ink-3); }
.spectrum-scale span { font-family: var(--mono); font-size: .68rem; }
.spectrum-caption { margin-top: .6rem; color: var(--ink-3); font-family: var(--sans); font-size: .76rem; letter-spacing: .02em; }

/* ── Floor plan (contents) ────────────────────────────────── */
.plan { max-width: var(--max); margin: 0 auto; padding: clamp(64px, 9vw, 140px) var(--gutter) clamp(48px, 7vw, 96px); }
.plan-head { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; margin-bottom: clamp(2rem, 4vw, 3.5rem); align-items: end; }
.plan-head h2 { grid-column: 1 / span 5; font-family: var(--serif-display); font-weight: 400; font-size: clamp(2.6rem, 5vw, 4.6rem); line-height: .95; margin: 0; letter-spacing: -.02em; }
.plan-head p { grid-column: 7 / span 6; margin: 0; color: var(--ink-2); }
@media (max-width: 860px) { .plan-head h2, .plan-head p { grid-column: 1 / -1; } }
.plan-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--ink); }
@media (max-width: 1100px) { .plan-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 760px) { .plan-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .plan-grid { grid-template-columns: 1fr; } }
.plan-grid li { border-bottom: 1px solid var(--rule); border-right: 1px solid var(--rule); }
.plan-grid a { display: grid; grid-template-rows: auto auto 1fr auto; gap: .5rem; padding: 1.2rem 1.2rem 1.4rem; height: 100%; text-decoration: none; transition: background .3s var(--ease); min-height: 15.5rem; }
.plan-grid a:hover { background: var(--card); }
.plan-grid .num { font-family: var(--serif-display); font-size: 1.9rem; line-height: 1; color: var(--ink-3); }
.plan-grid .t { font-family: var(--serif-display); font-size: 1.9rem; line-height: 1.02; letter-spacing: -.01em; }
.plan-grid .d { font-size: .92rem; color: var(--ink-2); line-height: 1.45; }
.plan-grid .chips { display: flex; height: 10px; margin-top: .7rem; }
.plan-grid .chips i { flex: 1; transition: flex .5s var(--ease); }
.plan-grid a:hover .chips i:first-child { flex: 3; }

/* ── Rooms ────────────────────────────────────────────────── */
.room { position: relative; padding: clamp(80px, 11vw, 180px) 0 clamp(64px, 9vw, 140px); border-top: 1px solid var(--rule); }
.room.dark { background: var(--dark); color: var(--dark-ink); border-top: 0; }
.room.dark a { text-decoration-color: #5a5750; }
.room.grey { background: #8a8a88; border-top: 0; }
.room.tint { background: var(--paper-2); border-top: 0; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

.room-head { display: grid; grid-template-columns: repeat(12, 1fr); gap: 0 24px; align-items: start; margin-bottom: clamp(2.5rem, 6vw, 5rem); }
.room-num {
  grid-column: 1 / span 3;
  font-family: var(--serif-display); font-weight: 400;
  font-size: clamp(5rem, 13vw, 12rem); line-height: .78; letter-spacing: -.03em;
  color: transparent; -webkit-text-stroke: 1px var(--ink-3);
}
.dark .room-num { -webkit-text-stroke-color: #5a5750; }
.room-title { grid-column: 4 / span 9; }
.room-title .kicker { color: var(--ink-3); display: flex; gap: 1.2rem; flex-wrap: wrap; margin-bottom: 1.1rem; }
.dark .room-title .kicker { color: var(--dark-ink-2); }
.room-title h2 { font-family: var(--serif-display); font-weight: 400; font-size: clamp(3.2rem, 8.5vw, 8rem); line-height: .9; letter-spacing: -.025em; margin: 0 0 1.4rem; }
.room-title .dek { font-family: var(--serif-text); font-style: italic; font-weight: 300; font-size: clamp(1.25rem, 1.1rem + .8vw, 1.8rem); line-height: 1.3; max-width: 34em; margin: 0; color: var(--ink-2); }
.dark .room-title .dek { color: var(--dark-ink-2); }
@media (max-width: 760px) {
  .room-num { grid-column: 1 / -1; font-size: 5rem; margin-bottom: 1rem; }
  .room-title { grid-column: 1 / -1; }
}

.text-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 0 24px; }
.essay { grid-column: 4 / span 6; }
.essay > p { margin: 0 0 1.15em; hanging-punctuation: first; }
.essay > p:first-child::first-letter {
  font-family: var(--serif-display); float: left; font-size: 4.3em; line-height: .8; padding: .06em .09em 0 0; margin-top: .02em;
}
.essay h3 { font-family: var(--sans); font-size: .76rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; margin: 2.2em 0 .8em; }
.essay blockquote { margin: 1.6em 0; padding: 0; font-family: var(--serif-display); font-size: 1.7em; line-height: 1.15; letter-spacing: -.005em; }
.essay blockquote footer { font-family: var(--sans); font-size: .42em; letter-spacing: .12em; text-transform: uppercase; margin-top: 1em; color: var(--ink-3); }
.dark .essay blockquote footer { color: var(--dark-ink-2); }
.margin { grid-column: 10 / span 3; font-family: var(--sans); font-size: .86rem; line-height: 1.5; color: var(--ink-2); padding-top: .35rem; }
.dark .margin { color: var(--dark-ink-2); }
.margin .note { border-top: 1px solid var(--rule-2); padding-top: .8rem; margin-bottom: 2rem; }
.dark .margin .note { border-top-color: var(--dark-rule); }
.margin .note b { display: block; font-weight: 600; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; margin-bottom: .4rem; color: var(--ink); }
.dark .margin .note b { color: var(--dark-ink); }
@media (max-width: 1100px) { .essay { grid-column: 2 / span 8; } .margin { grid-column: 10 / span 3; } }
@media (max-width: 860px) { .essay, .margin { grid-column: 1 / -1; } .margin { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; margin-top: 1.5rem; } }
@media (max-width: 520px) { .margin { grid-template-columns: 1fr; } }

/* citations */
sup.cite { font-family: var(--sans); font-size: .62em; font-weight: 600; line-height: 0; vertical-align: .55em; margin-left: .08em; letter-spacing: .02em; }
sup.cite a { color: var(--accent); text-decoration: none; padding: 0 .06em; }
.dark sup.cite a { color: #e88f6f; }
sup.cite a:hover { text-decoration: underline; }
.cite-pop {
  position: absolute; z-index: 60; max-width: min(24rem, calc(100vw - 32px));
  background: var(--ink); color: var(--paper); padding: .9rem 1rem 1rem; border-radius: 2px;
  font-family: var(--sans); font-size: .8rem; line-height: 1.45; box-shadow: 0 18px 40px -18px rgb(0 0 0 / .5);
  opacity: 0; transform: translateY(4px); transition: opacity .18s, transform .18s var(--ease); pointer-events: none;
}
.cite-pop.show { opacity: 1; transform: none; pointer-events: auto; }
.cite-pop .n { font-family: var(--mono); color: #e88f6f; margin-right: .4em; }
.cite-pop a { color: #f0c4b2; }

/* ── Plates (exhibits) ────────────────────────────────────── */
.plate { margin: clamp(3rem, 7vw, 6rem) 0 0; }
.plate-frame { background: var(--card); border: 1px solid var(--rule); padding: clamp(16px, 3vw, 40px); position: relative; }
.dark .plate-frame { background: var(--dark-2); border-color: var(--dark-rule); }
.grey .plate-frame { background: #8a8a88; border-color: #7a7a78; }
.plate figcaption { display: grid; grid-template-columns: repeat(12, 1fr); gap: 0 24px; margin-top: 1.1rem; font-family: var(--sans); font-size: .82rem; line-height: 1.5; color: var(--ink-2); }
.dark .plate figcaption { color: var(--dark-ink-2); }
.grey .plate figcaption { color: #1e1e1c; }
.plate figcaption .pl { grid-column: 1 / span 3; font-weight: 600; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink); }
.dark .plate figcaption .pl { color: var(--dark-ink); }
.grey .plate figcaption .pl { color: #0f0f0e; }
.plate figcaption .cap { grid-column: 4 / span 6; }
.plate figcaption .method { grid-column: 10 / span 3; color: var(--ink-3); font-size: .76rem; }
.dark .plate figcaption .method { color: #77736b; }
.grey .plate figcaption .method { color: #2a2a28; }
@media (max-width: 860px) { .plate figcaption .pl, .plate figcaption .cap, .plate figcaption .method { grid-column: 1 / -1; margin-bottom: .5rem; } }

/* ── Controls ─────────────────────────────────────────────── */
.controls { display: flex; flex-wrap: wrap; gap: 1.2rem 2rem; align-items: end; }
.ctl { display: grid; gap: .45rem; min-width: 0; }
.ctl > span, .ctl legend { font-family: var(--sans); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; color: var(--ink-3); padding: 0; }
.dark .ctl > span, .dark .ctl legend { color: var(--dark-ink-2); }
.grey .ctl > span, .grey .ctl legend { color: #1e1e1c; }
.ctl.grow { flex: 1 1 18rem; }
fieldset.ctl { border: 0; margin: 0; padding: 0; }

input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; background: transparent; height: 28px; margin: 0; cursor: pointer; --fill: var(--ink); --track: var(--rule-2); }
.dark input[type=range] { --fill: var(--dark-ink); --track: #3a3a3f; }
.grey input[type=range] { --fill: #0f0f0e; --track: #6c6c6a; }
input[type=range]::-webkit-slider-runnable-track { height: 1px; background: var(--track); }
input[type=range]::-moz-range-track { height: 1px; background: var(--track); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: var(--fill); margin-top: -8.5px; border: 3px solid var(--card); box-shadow: 0 0 0 1px var(--fill); transition: transform .15s; }
.dark input[type=range]::-webkit-slider-thumb { border-color: var(--dark-2); }
.grey input[type=range]::-webkit-slider-thumb { border-color: #8a8a88; }
input[type=range]::-moz-range-thumb { width: 12px; height: 12px; border-radius: 50%; background: var(--fill); border: 3px solid var(--card); box-shadow: 0 0 0 1px var(--fill); }
input[type=range]:active::-webkit-slider-thumb { transform: scale(1.15); }
input[type=range].spectral::-webkit-slider-runnable-track { height: 6px; background: var(--spectral-grad, var(--track)); border-radius: 3px; }
input[type=range].spectral::-webkit-slider-thumb { margin-top: -6px; }
input[type=range].spectral::-moz-range-track { height: 6px; background: var(--spectral-grad, var(--track)); border-radius: 3px; }
input[type=range].warmcool::-webkit-slider-runnable-track { height: 6px; background: var(--kelvin-grad, var(--track)); border-radius: 3px; }
input[type=range].warmcool::-webkit-slider-thumb { margin-top: -6px; }
input[type=range].warmcool::-moz-range-track { height: 6px; background: var(--kelvin-grad, var(--track)); border-radius: 3px; }
input[type=range].huewheel::-webkit-slider-runnable-track { height: 6px; background: var(--hue-grad, var(--track)); border-radius: 3px; }
input[type=range].huewheel::-webkit-slider-thumb { margin-top: -6px; }
input[type=range].huewheel::-moz-range-track { height: 6px; background: var(--hue-grad, var(--track)); border-radius: 3px; }

.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--rule-2); border-radius: 999px; padding: 3px; gap: 2px; }
.dark .seg { border-color: #3a3a3f; }
.grey .seg { border-color: #5f5f5d; }
.seg button, .btn {
  font: 500 .78rem/1 var(--sans); letter-spacing: .03em; color: inherit; background: transparent; border: 0; border-radius: 999px;
  padding: .62rem .95rem; cursor: pointer; transition: background .2s, color .2s; white-space: nowrap;
}
.seg button:hover { background: color-mix(in srgb, currentColor 8%, transparent); }
.seg button[aria-pressed=true] { background: var(--ink); color: var(--paper); }
.dark .seg button[aria-pressed=true] { background: var(--dark-ink); color: var(--dark); }
.grey .seg button[aria-pressed=true] { background: #0f0f0e; color: #e9e6df; }
.btn { border: 1px solid var(--rule-2); padding: .72rem 1.1rem; }
.btn:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.dark .btn { border-color: #3a3a3f; }
.dark .btn:hover { background: var(--dark-ink); color: var(--dark); }
.grey .btn { border-color: #5f5f5d; }
.grey .btn:hover { background: #0f0f0e; color: #e9e6df; }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.dark .btn.primary { background: var(--dark-ink); color: var(--dark); }
.grey .btn.primary { background: #0f0f0e; color: #e9e6df; border-color: #0f0f0e; }

.readout { font-family: var(--mono); font-size: .82rem; font-feature-settings: 'tnum', 'zero'; }
.readouts { display: grid; grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr)); border-top: 1px solid var(--rule); border-left: 1px solid var(--rule); margin: 0; }
.dark .readouts, .dark .readouts > div { border-color: var(--dark-rule); }
.grey .readouts, .grey .readouts > div { border-color: #6c6c6a; }
.readouts > div { padding: .75rem .9rem .85rem; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.readouts.two { grid-template-columns: 1fr 1fr; }
.readouts dt { font-family: var(--sans); font-size: .64rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; color: var(--ink-3); margin-bottom: .35rem; }
.dark .readouts dt { color: var(--dark-ink-2); }
.readouts dd { margin: 0; font-family: var(--mono); font-size: 1.02rem; font-feature-settings: 'tnum', 'zero'; white-space: nowrap; }
.readouts dd small { font-size: .7em; color: var(--ink-3); margin-left: .2em; }
.dark .readouts dd small { color: var(--dark-ink-2); }

.chart { width: 100%; height: auto; }
.chart text { font-family: var(--mono); font-size: 10px; fill: var(--ink-3); }
.dark .chart text { fill: var(--dark-ink-2); }
@media (max-width: 600px) { .chart text { font-size: 15px; } }
.chart .axis { stroke: var(--rule-2); stroke-width: 1; fill: none; }
.dark .chart .axis { stroke: #3a3a3f; }
.grey .chart text { fill: #1e1e1c; }
.grey .chart .axis { stroke: #4a4a48; }
.chart .grid { stroke: var(--rule); stroke-width: 1; stroke-dasharray: 1 3; fill: none; }
.dark .chart .grid { stroke: #2a2a2e; }
.grey .chart .grid { stroke: #6c6c6a; }

.swatch-label { font-family: var(--sans); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; font-weight: 600; }

/* ── Plate layouts ────────────────────────────────────────── */
.split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(20px, 3vw, 44px); align-items: start; }
.split.wide-left { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
@media (max-width: 900px) { .split, .split.wide-left { grid-template-columns: 1fr; } }
.stack { display: grid; gap: 1.4rem; }

/* Plate I — light */
.p-light .field { position: relative; aspect-ratio: 16 / 10; border-radius: 1px; overflow: hidden; background: #000; }
.btn-row { display: flex; gap: .6rem; flex-wrap: wrap; }
.p-light .glow { position: absolute; inset: 0; transition: background .08s linear; }
.p-light .wave { position: absolute; inset: 0; width: 100%; height: 100%; }
.p-light .field .nm { position: absolute; left: 20px; bottom: 16px; font-family: var(--serif-display); font-size: clamp(2.6rem, 6vw, 5rem); line-height: 1; color: #fff; text-shadow: 0 1px 18px rgb(0 0 0 / .45); }
.p-light .field .nm small { font-family: var(--sans); font-size: .9rem; letter-spacing: .1em; margin-left: .3rem; }

/* Plate III — metamers */
.metamer-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 3px; aspect-ratio: 16 / 9; border-radius: 1px; overflow: hidden; }
.chart-key { display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; font-family: var(--sans); font-size: .74rem; color: var(--ink-2); margin-top: .4rem; }
.chart-key i { display: inline-block; width: 22px; height: 0; border-top: 2px solid currentColor; vertical-align: middle; margin-right: .4rem; }
.chart-key i.dash { border-top-style: dashed; }
.chart-key i.dot { border-top-style: dotted; }
.grey .chart-key { color: #1e1e1c; }
.metamer-pair div { position: relative; transition: background .25s; }
.metamer-pair span { position: absolute; left: 14px; bottom: 12px; font-family: var(--sans); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; color: rgb(0 0 0 / .55); }
.metamer-pair div + div span { left: auto; right: 14px; }
.presets { display: flex; flex-wrap: wrap; gap: .4rem; }

/* Plate IV — paint */
.mix-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.mix-row .sw { aspect-ratio: 1; border-radius: 1px; position: relative; transition: background .2s; }
.mix-row figure { margin: 0; }
.mix-row figure p { margin: .55rem 0 0; font-family: var(--sans); font-size: .76rem; line-height: 1.35; color: var(--ink-2); }
.mix-row figure p b { display: block; font-weight: 600; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink); }
.pigment-pick { display: flex; gap: .5rem; flex-wrap: wrap; }
.pigment-pick button { width: 2.6rem; height: 2.6rem; border-radius: 50%; border: 1px solid rgb(0 0 0 / .12); cursor: pointer; position: relative; background: var(--c); }
.pigment-pick button[aria-pressed=true]::after { content: ''; position: absolute; inset: -5px; border: 1.5px solid var(--ink); border-radius: 50%; }

/* Plate V — horseshoe */
.p-cie { position: relative; }
.p-cie canvas { width: 100%; height: auto; aspect-ratio: 1 / 1.02; cursor: crosshair; touch-action: none; }
.legend { display: flex; flex-wrap: wrap; gap: .5rem 1rem; }
.legend button { display: inline-flex; align-items: center; gap: .5rem; font: 500 .78rem/1 var(--sans); color: inherit; background: transparent; border: 1px solid var(--rule-2); border-radius: 999px; padding: .55rem .85rem; cursor: pointer; }
.legend button i { width: 18px; height: 0; border-top: 2px solid var(--c); display: inline-block; }
.legend button[aria-pressed=false] { opacity: .45; }
.probe { display: flex; gap: 1rem; align-items: center; }
.probe .chip { width: 64px; height: 64px; flex: none; border-radius: 1px; border: 1px solid rgb(0 0 0 / .08); }

/* Plate VI — uniformity */
.ramp { height: 64px; border-radius: 1px; position: relative; }
.ramp-label { display: flex; justify-content: space-between; align-items: baseline; margin: 1.3rem 0 .5rem; }
.ramp-label b { font-family: var(--sans); font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; }
.ramp-label span { font-family: var(--mono); font-size: .72rem; color: var(--ink-3); }
.steps { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 3px; height: 64px; }
.steps div { border-radius: 1px; }
.step-bars { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 3px; height: 36px; align-items: end; margin-top: 22px; }
.step-bars div { background: var(--ink); min-height: 1px; position: relative; }
.step-bars div span { position: absolute; bottom: 100%; left: 0; right: 0; text-align: center; font-family: var(--mono); font-size: .6rem; color: var(--ink-3); padding-bottom: 2px; }
.pickers { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
input[type=color] { -webkit-appearance: none; appearance: none; width: 3rem; height: 3rem; border: 1px solid var(--rule-2); border-radius: 50%; padding: 0; background: none; cursor: pointer; }
input[type=color]::-webkit-color-swatch-wrapper { padding: 3px; }
input[type=color]::-webkit-color-swatch { border: 0; border-radius: 50%; }
input[type=color]::-moz-color-swatch { border: 0; border-radius: 50%; }

/* Plate VII — Albers */
.albers { position: relative; display: grid; grid-template-columns: 1fr 1fr; aspect-ratio: 2 / 1; overflow: hidden; border-radius: 1px; }
.albers .ground { position: relative; display: grid; place-items: center; transition: background .6s var(--ease); }
.albers .fig { width: 20%; aspect-ratio: 1; position: relative; z-index: 2; }
.albers .bridge { position: absolute; z-index: 1; top: 50%; left: 40%; right: 40%; height: 12%; transform: translateY(-50%) scaleX(0); transform-origin: center; transition: transform .8s var(--ease); }
.albers.bridged .bridge { transform: translateY(-50%) scaleX(1); }
.albers.bridged .fig { z-index: 2; }
@media (max-width: 600px) { .albers { aspect-ratio: 4 / 3; } .albers .fig { width: 34%; } .albers .bridge { left: 33%; right: 33%; height: 17%; } }

.afterimage { position: relative; aspect-ratio: 16 / 9; overflow: hidden; border-radius: 1px; background: #777; user-select: none; }
.afterimage svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.afterimage .fix { position: absolute; left: 50%; top: 50%; width: 10px; height: 10px; margin: -5px 0 0 -5px; border-radius: 50%; background: #000; box-shadow: 0 0 0 2px #fff; z-index: 3; }
.afterimage .count { position: absolute; right: 16px; top: 14px; font-family: var(--mono); font-size: .8rem; color: #fff; mix-blend-mode: difference; z-index: 3; }
.afterimage .ring { position: absolute; left: 50%; top: 50%; width: 44px; height: 44px; margin: -22px 0 0 -22px; z-index: 3; transform: rotate(-90deg); }
.afterimage .ring circle { fill: none; stroke: #fff; stroke-width: 2; opacity: .8; }

/* Plate VIII — Mondrian */
.mondrian-pair { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(10px, 2vw, 24px); }
.mondrian-pair figure { margin: 0; }
.mondrian-pair svg { width: 100%; height: auto; aspect-ratio: 4 / 5; background: #111; }
.mondrian-pair figure > div { display: flex; justify-content: space-between; margin-top: .6rem; gap: .5rem; }
.mondrian-pair svg rect { transition: fill .25s linear; cursor: pointer; }
.mondrian-pair svg rect.sel { stroke: #fff; stroke-width: 3; }
@media (max-width: 600px) { .mondrian-pair { grid-template-columns: 1fr 1fr; gap: 8px; } }

/* Plate IX — words */
.bk { display: grid; grid-template-columns: repeat(7, 1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.bk > div { background: var(--card); padding: 1rem .9rem 1.1rem; display: grid; grid-template-rows: auto 1fr auto; gap: .7rem; min-height: 15rem; transition: background .3s; }
.bk > div.on { background: #fff; }
.bk .stage { font-family: var(--serif-display); font-size: 2rem; line-height: 1; }
.bk .stack-sw { display: grid; gap: 4px; align-content: start; }
.bk .stack-sw i { display: block; height: 34px; border-radius: 1px; position: relative; }
.bk .stack-sw i span { position: absolute; left: 8px; bottom: 6px; font: 600 .6rem/1 var(--sans); letter-spacing: .12em; text-transform: uppercase; font-style: normal; }
.bk .terms { font-family: var(--sans); font-size: .74rem; line-height: 1.4; color: var(--ink-2); }
@media (max-width: 900px) { .bk { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 560px) { .bk { grid-template-columns: repeat(2, 1fr); } .bk > div { min-height: 0; } }
.blues { margin-top: 2.5rem; }
.blues .bar { height: 88px; position: relative; border-radius: 1px; }
.blues .bar .tick { position: absolute; top: -8px; bottom: -8px; width: 1px; background: var(--ink); }
.blues .lab { display: grid; grid-template-columns: 1fr 1fr; margin-top: .9rem; font-family: var(--serif-display); font-size: 1.5rem; }
.blues .lab span:last-child { text-align: right; }
.blues .lab small { display: block; font-family: var(--sans); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.blues .en { border-top: 1px solid var(--ink); margin-top: .8rem; padding-top: .5rem; text-align: center; font-family: var(--serif-display); font-size: 1.4rem; }
.blues .en small { font-family: var(--sans); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }

/* Plate X — HUD */
.hud { background: #14161b; color: #e8e6e1; border-radius: 4px; padding: clamp(14px, 2.4vw, 28px); display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(14px, 2.4vw, 28px); font-family: var(--sans); }
@media (max-width: 760px) { .hud { grid-template-columns: 1fr; } }
.hud h4 { margin: 0 0 .8rem; font-size: .66rem; letter-spacing: .16em; text-transform: uppercase; color: #8e8b84; font-weight: 600; }
.hud .map { aspect-ratio: 1.25; background: #1d2027; border-radius: 3px; position: relative; overflow: hidden; }
.hud .map svg { width: 100%; height: 100%; }
.hud .bars { display: grid; gap: .6rem; margin-bottom: 1.4rem; }
.hud .bar { height: 14px; background: #262a33; border-radius: 2px; overflow: hidden; position: relative; }
.hud .bar i { position: absolute; inset: 0 auto 0 0; }
.hud .bar-row { display: grid; grid-template-columns: 4.2rem 1fr 3rem; align-items: center; gap: .7rem; font-size: .74rem; color: #b7b3aa; }
.hud .bar-row span:last-child { font-family: var(--mono); text-align: right; font-size: .7rem; }
.hud .loot { display: grid; gap: 6px; }
.hud .item { display: grid; grid-template-columns: 2.2rem 1fr auto; align-items: center; gap: .7rem; padding: .45rem .6rem; border-radius: 3px; background: #1d2027; border-left: 3px solid var(--c); font-size: .84rem; }
.hud .item .gem { width: 2.2rem; height: 2.2rem; border-radius: 3px; background: var(--c); display: grid; place-items: center; color: #14161b; font-weight: 700; font-size: .7rem; }
.hud .item .tier { font-size: .62rem; letter-spacing: .14em; text-transform: uppercase; color: var(--c); font-weight: 600; }
.hud .pips { font-family: var(--mono); font-size: .7rem; color: #8e8b84; letter-spacing: .1em; }

/* Plate XI — harmony */
.poster { aspect-ratio: 4 / 5; position: relative; overflow: hidden; border-radius: 1px; container-type: inline-size; }
.poster svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.poster .ptitle { position: absolute; left: 7%; right: 7%; bottom: 6%; font-family: var(--serif-display); font-size: 17cqw; line-height: .85; letter-spacing: -.03em; }
.poster .psub { position: absolute; left: 7%; top: 6%; font-family: var(--sans); font-size: 2.4cqw; letter-spacing: .16em; text-transform: uppercase; font-weight: 600; }
.palette { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.palette button { aspect-ratio: 1 / 1.3; border: 0; border-radius: 1px; cursor: pointer; position: relative; padding: 0; background: var(--c); }
.palette button span { position: absolute; left: 6px; bottom: 6px; font-family: var(--mono); font-size: .62rem; color: var(--t); }

/* Plate XII — colour maps */
.cmap canvas.field { width: 100%; height: auto; aspect-ratio: 16 / 9; border-radius: 1px; image-rendering: auto; }
.cmap canvas.bar { width: 100%; height: 18px; margin-top: 12px; border-radius: 1px; }
.cmap svg.lcurve { margin-top: 10px; }

/* ── Epilogue, methods, references, colophon ──────────────── */
.epilogue { padding: clamp(100px, 14vw, 220px) 0; text-align: center; border-top: 1px solid var(--rule); }
.epilogue blockquote { margin: 0 auto; max-width: 18ch; font-family: var(--serif-display); font-size: clamp(2.4rem, 6vw, 5.4rem); line-height: 1; letter-spacing: -.02em; }
.epilogue p { max-width: 34rem; margin: 2.2rem auto 0; color: var(--ink-2); }

.appendix { border-top: 1px solid var(--ink); padding: clamp(64px, 8vw, 120px) 0; }
.appendix h2 { font-family: var(--serif-display); font-weight: 400; font-size: clamp(2.6rem, 5vw, 4.4rem); letter-spacing: -.02em; line-height: 1; margin: 0 0 .3em; }
.appendix .lede { color: var(--ink-2); max-width: 40rem; margin: 0 0 3rem; }
.methods { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 22rem), 1fr)); gap: 0 32px; }
.methods > div { border-top: 1px solid var(--rule-2); padding: 1rem 0 1.6rem; font-family: var(--sans); font-size: .86rem; line-height: 1.55; color: var(--ink-2); }
.methods b { display: block; color: var(--ink); font-weight: 600; font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; margin-bottom: .45rem; }

ol.refs { list-style: none; margin: 0; padding: 0; columns: 2 30rem; column-gap: 48px; }
ol.refs li { break-inside: avoid; display: grid; grid-template-columns: 2.4rem 1fr; padding: .7rem 0 .8rem; border-top: 1px solid var(--rule); font-size: .92rem; line-height: 1.45; scroll-margin-top: 90px; }
ol.refs li:target { background: color-mix(in srgb, var(--accent) 9%, transparent); }
ol.refs .n { font-family: var(--mono); font-size: .76rem; color: var(--accent); padding-top: .15em; }
ol.refs .t { font-style: italic; }
ol.refs .link { display: inline-block; font-family: var(--mono); font-size: .74rem; word-break: break-all; margin-top: .2rem; color: var(--ink-2); }
ol.refs .back { font-family: var(--sans); font-size: .72rem; text-decoration: none; color: var(--ink-3); margin-left: .4rem; }
.ref-stats { display: flex; gap: 2.5rem; flex-wrap: wrap; margin: 0 0 2.5rem; }
.ref-stats div { font-family: var(--serif-display); font-size: 3rem; line-height: 1; }
.ref-stats small { display: block; font-family: var(--sans); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); margin-top: .4rem; }

.colophon { background: var(--dark); color: var(--dark-ink); padding: clamp(64px, 8vw, 110px) 0 48px; }
.colophon .cols { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; }
.colophon .big { grid-column: 1 / span 6; font-family: var(--serif-display); font-size: clamp(2.4rem, 5vw, 4.2rem); line-height: .95; letter-spacing: -.02em; }
.colophon .big i { color: var(--dark-ink-2); }
.colophon .small { grid-column: 8 / span 5; font-family: var(--sans); font-size: .86rem; line-height: 1.6; color: var(--dark-ink-2); }
.colophon .small p { margin: 0 0 1rem; }
.colophon .small b { color: var(--dark-ink); font-weight: 600; }
.colophon .foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; margin-top: 4rem; padding-top: 1.2rem; border-top: 1px solid var(--dark-rule); color: #6f6b64; }
.colophon .fontspec { display: grid; gap: .9rem; margin-top: 1.4rem; }
.colophon .fontspec div { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--dark-rule); padding-bottom: .6rem; color: var(--dark-ink); }
@media (max-width: 860px) { .colophon .big, .colophon .small { grid-column: 1 / -1; } }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }
.no-js .reveal { opacity: 1; transform: none; }
noscript .nojs { display: block; background: var(--ink); color: var(--paper); padding: 1rem var(--gutter); font-family: var(--sans); font-size: .9rem; }