/* ============================================================
   CHROMA — Laboratory of Colour Perception
   White gallery walls; instruments as exhibits; the accent hue
   drifts through OKLCH hue space (--hue, driven by main.js).
   ============================================================ */

:root {
  --hue: 235; /* unitless degrees, animated by main.js */

  /* the gallery itself picks up a whisper of the drifting hue */
  --paper: oklch(97.6% 0.006 var(--hue));
  --paper-2: oklch(94.8% 0.012 var(--hue));
  --paper-hot: oklch(99.2% 0.018 calc(var(--hue) + 52));
  --ink: #1a1915;
  --ink-soft: #56534a;
  --ink-mute: #747065;
  --line: oklch(89% 0.008 var(--hue));

  --accent: oklch(62% 0.19 var(--hue));
  --accent-deep: oklch(42% 0.15 var(--hue));   /* text-safe on paper */
  --accent-tint: oklch(93% 0.05 var(--hue));
  --accent-numeral: oklch(89% 0.075 var(--hue));
  --accent-ghost: oklch(96% 0.025 var(--hue));
  --accent-hot: oklch(72% 0.18 calc(var(--hue) + 68));

  --font-display: 'Six Caps', sans-serif;
  --font-mono: 'Chivo Mono', monospace;
  --font-body: 'Archivo', sans-serif;

  --wrap: 1220px;
  --frame-shadow: 0 1px 2px rgb(26 25 21 / .05), 0 22px 60px -26px rgb(26 25 21 / .3);
  --hard-shadow: 9px 10px 0 color-mix(in oklab, var(--accent) 20%, transparent);
  --ease-out: cubic-bezier(.19,.75,.28,1);
  --ease-snap: cubic-bezier(.2,.86,.19,1);
}

@supports not (color: oklch(50% 0.1 100)) {
  :root {
    --paper: #faf9f6; --paper-2: #f1efe9; --line: #e3e1d9;
    --accent: hsl(var(--hue), 70%, 52%);
    --accent-deep: hsl(var(--hue), 60%, 32%);
    --accent-tint: hsl(var(--hue), 55%, 90%);
    --accent-numeral: hsl(var(--hue), 45%, 86%);
    --accent-ghost: hsl(var(--hue), 40%, 95%);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  scrollbar-color: var(--accent-deep) color-mix(in oklab, var(--paper-2) 86%, white);
}

body {
  position: relative;
  background:
    radial-gradient(circle at 15% -5%, color-mix(in oklab, var(--paper-hot) 82%, white) 0 18rem, transparent 42rem),
    radial-gradient(circle at 96% 8%, var(--accent-ghost) 0 12rem, transparent 33rem),
    linear-gradient(112deg, var(--paper) 0%, color-mix(in oklab, var(--paper) 76%, white) 48%, var(--paper-2) 100%);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.62;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  font-kerning: normal;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: color-mix(in oklab, var(--accent) 22%, transparent);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .42;
  background:
    linear-gradient(to right, transparent 0 7rem, color-mix(in oklab, var(--line) 78%, transparent) 7rem calc(7rem + 1px), transparent calc(7rem + 1px)),
    linear-gradient(to bottom, transparent 0 12rem, color-mix(in oklab, var(--line) 62%, transparent) 12rem calc(12rem + 1px), transparent calc(12rem + 1px));
  background-size: 19rem 100%, 100% 17rem;
  mask-image: linear-gradient(to bottom, transparent, #000 9rem, #000 84%, transparent);
}

body > * {
  position: relative;
  z-index: 1;
}

/* gallery grain — one fixed film over everything */
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 60;
  opacity: .24;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums slashed-zero;
}
.sr-only {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

::selection {
  background: color-mix(in oklab, var(--accent) 82%, var(--ink));
  color: #fff;
  text-shadow: none;
}

::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: color-mix(in oklab, var(--paper-2) 86%, white); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--accent), var(--accent-deep));
  border: 3px solid color-mix(in oklab, var(--paper-2) 86%, white);
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-deep); }

a { color: var(--accent-deep); }

p, li { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }
section[id] { scroll-margin-top: 84px; }

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

.skip {
  position: fixed; top: -60px; left: 16px; z-index: 200;
  background: var(--ink); color: var(--paper);
  font-family: var(--font-mono); font-size: .8rem;
  padding: 12px 18px; text-decoration: none;
  transition: top .2s;
}
.skip:focus-visible { top: 12px; }

/* ============================================================
   HEADER
   ============================================================ */
.site-head {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; gap: 16px;
  padding: 0 clamp(14px, 3vw, 36px);
  height: 64px;
  background: color-mix(in oklab, var(--paper) 86%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  overflow: clip;
}
.site-head::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(to right in oklch,
    transparent,
    oklch(70% 0.17 calc(var(--hue) + 0)),
    oklch(70% 0.17 calc(var(--hue) + 120)),
    oklch(70% 0.17 calc(var(--hue) + 240)),
    transparent);
  opacity: .75;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 2.05rem;
  letter-spacing: .085em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex; align-items: center;
  min-height: 44px;
  line-height: .9;
}
.wordmark-o {
  width: .58em; height: .58em;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  margin: 0 .075em;
  transform: translateY(.08em);
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .12), 0 0 0 3px var(--accent-ghost);
}

.head-nav {
  display: flex; align-items: center; gap: 4px;
  margin-left: auto;
}
.navnum, .navtxt {
  font-family: var(--font-mono);
  font-size: .78rem;
  text-decoration: none;
  color: var(--ink-soft);
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px;
  touch-action: manipulation;
}
.navnum {
  min-width: 44px;
  border: 1px solid transparent;
}
.navnum:hover, .navtxt:hover { color: var(--accent-deep); }
.navnum:hover { border-color: var(--line); background: var(--accent-ghost); }
.navtxt { padding: 0 10px; letter-spacing: .08em; text-transform: uppercase; }
.navtxt:hover { text-decoration: underline; text-underline-offset: 5px; }

.hue-station { display: flex; align-items: center; gap: 10px; }
.hue-hold {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: none; border: none; cursor: grab;
  border-radius: 50%;
  touch-action: none;
}
.hue-hold:active { cursor: grabbing; }
.hue-hold:hover .hue-wheel { transform: scale(1.1); }
.hue-wheel {
  position: relative;
  width: 26px; height: 26px; border-radius: 50%;
  background: conic-gradient(in oklch,
    oklch(65% 0.15 0), oklch(65% 0.15 45), oklch(65% 0.15 90),
    oklch(65% 0.15 135), oklch(65% 0.15 180), oklch(65% 0.15 225),
    oklch(65% 0.15 270), oklch(65% 0.15 315), oklch(65% 0.15 360));
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .15);
  transition: transform .22s var(--ease-out), box-shadow .22s var(--ease-out);
}
.hue-wheel::after {
  content: ""; position: absolute; inset: 7px;
  border-radius: 50%; background: var(--paper);
}
.hue-wheel i {
  position: absolute; inset: 0;
  transform: rotate(calc(var(--hue) * 1deg));
}
.hue-wheel i::before {
  content: ""; position: absolute;
  top: 1px; left: 50%; margin-left: -1.5px;
  width: 3px; height: 5px;
  background: #fff;
  box-shadow: 0 0 0 1px rgb(26 25 21 / .55);
  border-radius: 1.5px;
}
.hue-hold[aria-pressed="true"] .hue-wheel::after {
  background: var(--ink);
}
.hue-hold[aria-pressed="true"] .hue-wheel {
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .2), 0 0 0 4px var(--accent-ghost), 0 0 0 1px var(--accent);
}
.hue-read {
  font-size: .78rem; color: var(--ink-soft);
  min-width: 74px;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  max-width: none;
  margin: 0;
  min-height: min(780px, calc(100svh - 64px));
  padding: clamp(62px, 10vh, 132px) clamp(18px, 7vw, 96px) clamp(48px, 8vh, 96px) clamp(18px, 11vw, 170px);
  position: relative;
  overflow: clip;
}
.hero::before {
  content: "";
  position: absolute;
  left: clamp(18px, 11vw, 170px);
  right: clamp(18px, 7vw, 96px);
  top: clamp(84px, 15vh, 170px);
  height: 1px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
  opacity: 0;
  animation: wallScan 1.3s cubic-bezier(.19,.75,.28,1) .35s forwards;
}
.hero::after {
  content: "wall instrument 05 / drifting white";
  position: absolute;
  right: clamp(14px, 2.6vw, 40px);
  top: clamp(96px, 22vh, 240px);
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--ink-mute);
  opacity: .55;
}
@keyframes wallScan {
  from { opacity: 0; transform: translateX(-12%) scaleX(.28); }
  45% { opacity: .9; }
  to { opacity: .35; transform: none; }
}

.kicker {
  font-size: .8rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--accent-deep);
  text-wrap: balance;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(7.4rem, 24vw, 22rem);
  line-height: .72;
  letter-spacing: .055em;
  margin: .1em 0 .18em;
  display: flex;
  align-items: baseline;
  user-select: none;
  text-wrap: nowrap;
}
.ht { display: inline-block; }
.ht-o {
  width: .46em; height: .46em;
  align-self: center;
  margin: 0 .09em 0 .05em;
  position: relative;
}
.ht-o i {
  position: absolute; inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 32%,
    oklch(70% 0.17 calc(var(--hue) + 18)) 0%,
    var(--accent) 62%,
    oklch(48% 0.19 calc(var(--hue) - 14)) 100%);
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .1);
}
.ht-o i::after {
  content: "";
  position: absolute;
  inset: -12%;
  border-radius: 50%;
  border: 1px solid var(--accent);
  opacity: 0;
  animation: apertureBloom 1.55s var(--ease-snap) .62s forwards;
}
@keyframes apertureBloom {
  0% { opacity: 0; transform: scale(.42); }
  28% { opacity: .55; }
  100% { opacity: 0; transform: scale(1.55); }
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .72fr);
  gap: clamp(24px, 7vw, 112px);
  align-items: start;
  max-width: 1120px;
}
.lede-stack {
  position: relative;
  padding-left: clamp(14px, 2vw, 24px);
}
.lede-stack::before {
  content: "";
  position: absolute;
  left: 0;
  top: .45em;
  bottom: .4em;
  width: 3px;
  background: var(--accent);
}
.lede {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  line-height: 1.65;
  max-width: 34em;
  color: var(--ink);
}
.lede + .lede { margin-top: 1em; }
.hero-stat {
  margin-top: 18px;
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.wall-console {
  background: color-mix(in oklab, white 92%, var(--paper-hot));
  border: 1px solid var(--line);
  box-shadow: var(--frame-shadow), var(--hard-shadow);
  padding: 12px;
  transform: translateY(-16px);
}
.console-head,
.console-readouts {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: .64rem;
  line-height: 1.4;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.console-head {
  margin-bottom: 9px;
  color: var(--ink);
}
.console-readouts {
  margin-top: 10px;
  color: var(--ink-soft);
}
.calib {
  display: flex; align-items: stretch; gap: 0;
  height: 112px;
  border: 1px solid color-mix(in oklab, var(--ink) 18%, var(--line));
  background: #fff;
  padding: 7px;
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / .65);
  position: relative;
}
.calib-chip {
  flex: 1;
  transform-origin: left center;
  opacity: 0;
  animation: calibrateChip .72s var(--ease-snap) forwards;
}
.calib-chip.c1 { animation-delay: .86s; }
.calib-chip.c2 { animation-delay: .91s; }
.calib-chip.c3 { animation-delay: .96s; }
.calib-chip.c4 { animation-delay: 1.01s; }
.calib-chip.c5 { animation-delay: 1.06s; }
.calib-chip.c6 { animation-delay: 1.11s; }
.calib-chip.c7 { animation-delay: 1.16s; }
@keyframes calibrateChip {
  from { opacity: .18; transform: scaleX(.08); filter: saturate(.35); }
  to { opacity: 1; transform: scaleX(1); filter: none; }
}
.calib-chip.c1 { background: oklch(65% 0.16 calc(var(--hue) + 0)); }
.calib-chip.c2 { background: oklch(65% 0.16 calc(var(--hue) + 51)); }
.calib-chip.c3 { background: oklch(65% 0.16 calc(var(--hue) + 103)); }
.calib-chip.c4 { background: oklch(65% 0.16 calc(var(--hue) + 154)); }
.calib-chip.c5 { background: oklch(65% 0.16 calc(var(--hue) + 206)); }
.calib-chip.c6 { background: oklch(65% 0.16 calc(var(--hue) + 257)); }
.calib-chip.c7 { background: oklch(65% 0.16 calc(var(--hue) + 309)); }
.calib-note {
  position: absolute; bottom: -24px; right: 0;
  font-size: .68rem; letter-spacing: .1em;
  color: var(--ink-soft);
}

.please {
  margin-top: clamp(46px, 8vh, 88px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: .8rem;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--accent-deep);
  max-width: 1120px;
}

/* ---- load reveal choreography ---- */
.lr { opacity: 0; animation: rise .8s cubic-bezier(.19,.75,.28,1) forwards; }
.lr-1 { animation-delay: .05s; }
.lr-2 { animation-delay: .16s; }
.lr-3 { animation-delay: .22s; }
.lr-4 { animation-delay: .28s; }
.lr-5 { animation-delay: .34s; }
.lr-6 { animation-delay: .40s; }
.lr-7 { animation-delay: .46s; }
.lr-8 { animation-delay: .62s; }
.lr-9 { animation-delay: .74s; }
.lr-10 { animation-delay: .9s; }
@keyframes rise {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: none; }
}

/* ---- scroll reveal ---- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s cubic-bezier(.19,.75,.28,1); }
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   WAYFINDING
   ============================================================ */
.wayfind {
  max-width: none;
  margin: -44px 0 0;
  padding: 0 clamp(18px, 7vw, 96px) clamp(68px, 10vh, 128px) clamp(18px, 11vw, 170px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(12px, 1.8vw, 24px);
  position: relative;
}
.wayfind::before {
  content: "floor plan / permanent instruments";
  position: absolute;
  left: clamp(18px, 11vw, 170px);
  right: clamp(18px, 7vw, 96px);
  top: -32px;
  border-top: 1px solid var(--ink);
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.way-card {
  display: flex; flex-direction: column; justify-content: flex-end; gap: 5px;
  min-height: clamp(138px, 13vw, 188px);
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, color-mix(in oklab, white 90%, var(--accent-ghost)), #fff 58%),
    #fff;
  text-decoration: none;
  color: var(--ink);
  position: relative;
  overflow: hidden;
  transition: transform .25s cubic-bezier(.19,.75,.28,1), box-shadow .25s, border-color .25s, background-color .25s;
}
.way-card::before {
  content: "";
  position: absolute;
  inset: 11px;
  border: 1px solid color-mix(in oklab, var(--line) 72%, transparent);
  pointer-events: none;
}
.way-card::after {
  content: attr(href);
  position: absolute;
  top: 10px;
  right: 13px;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  opacity: .55;
}
.way-card:hover {
  transform: translateY(-7px) rotate(-.35deg);
  box-shadow: var(--frame-shadow), 7px 7px 0 var(--accent-ghost);
  border-color: color-mix(in oklab, var(--accent) 46%, var(--line));
}
.way-card:focus-visible {
  transform: translateY(-7px) rotate(-.35deg);
  box-shadow: var(--frame-shadow), 0 0 0 3px var(--paper), 0 0 0 5px var(--accent-deep);
}
.way-card:nth-child(even) { transform: translateY(18px); }
.way-card:nth-child(even):hover { transform: translateY(9px) rotate(.35deg); }
.way-num {
  font-family: var(--font-display);
  font-size: clamp(4.3rem, 7vw, 6.6rem);
  color: var(--accent-deep);
  line-height: .72;
  letter-spacing: .04em;
}
.way-title { font-weight: 700; font-size: .98rem; letter-spacing: .01em; }
.way-note { font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); }

/* ============================================================
   EXHIBITS — shared chassis
   ============================================================ */
.exhibit, .notes, .colophon {
  position: relative;
  overflow: clip;
}
.exhibit {
  padding: clamp(68px, 11vh, 146px) 0;
  border-top: 1px solid var(--line);
}
.exhibit::after {
  content: "";
  position: absolute;
  left: clamp(18px, 11vw, 170px);
  right: clamp(18px, 7vw, 96px);
  bottom: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--line), transparent);
}
.ex-alt {
  background:
    linear-gradient(118deg, color-mix(in oklab, var(--paper-2) 84%, white), var(--paper-2)),
    var(--paper-2);
}

.ex-num {
  position: absolute;
  top: -.08em;
  left: max(-.08em, -2vw);
  font-family: var(--font-display);
  font-size: clamp(13rem, 31vw, 31rem);
  line-height: .82;
  color: var(--accent-numeral);
  letter-spacing: .02em;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.ex-inner {
  position: relative; z-index: 1;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 40px);
}

.ex-head {
  max-width: 780px;
  margin-bottom: clamp(30px, 5vh, 58px);
  padding-top: clamp(34px, 6vw, 92px);
  position: relative;
}
.ex-head::before {
  content: "";
  display: block;
  width: 64px;
  height: 5px;
  background: var(--accent);
  margin-bottom: clamp(16px, 2vw, 24px);
}
.ex-meta {
  display: none;
  position: absolute;
  top: clamp(38px, 6.5vw, 96px);
  right: clamp(18px, 4vw, 40px);
  text-align: right;
  font-size: .68rem;
  line-height: 1.9;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.ex-meta::before {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  background: var(--accent);
  margin: 0 0 10px auto;
}
@media (min-width: 1000px) {
  .ex-meta { display: block; }
}
.ex-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(4rem, 9.2vw, 8.2rem);
  line-height: .92;
  letter-spacing: .055em;
  text-transform: uppercase;
  margin-bottom: .35em;
  text-wrap: balance;
}
.ex-lede { color: var(--ink-soft); font-size: clamp(1rem, 1.3vw, 1.125rem); max-width: 62ch; }

/* framed instrument */
.frame {
  position: relative;
  background:
    linear-gradient(180deg, color-mix(in oklab, #fff 88%, var(--paper-hot)), #fff 42%),
    #fff;
  border: 1px solid color-mix(in oklab, var(--line) 82%, var(--ink));
  box-shadow: var(--frame-shadow);
  padding: calc(clamp(14px, 2.4vw, 30px) + 34px) clamp(12px, 2.4vw, 28px) clamp(12px, 2.4vw, 28px);
  isolation: isolate;
  transition: box-shadow .28s var(--ease-out), border-color .28s var(--ease-out), background-color .28s var(--ease-out);
}
.frame::before {
  content: attr(data-frame);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  min-height: 34px;
  display: flex;
  align-items: center;
  padding: 0 14px;
  background: var(--ink);
  color: color-mix(in oklab, var(--paper) 82%, white);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  z-index: 3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.frame::after {
  content: "";
  position: absolute;
  inset: 44px 10px 10px;
  border: 1px solid rgb(26 25 21 / .06);
  background:
    linear-gradient(118deg, rgb(255 255 255 / .22), transparent 24%, transparent 74%, rgb(255 255 255 / .14)),
    linear-gradient(to bottom, rgb(255 255 255 / .18), transparent 32%);
  pointer-events: none;
  z-index: 2;
}
.frame:hover,
.frame:focus-within {
  border-color: color-mix(in oklab, var(--accent) 44%, var(--line));
  box-shadow: var(--frame-shadow), 0 0 0 1px color-mix(in oklab, var(--accent) 22%, transparent), 11px 12px 0 color-mix(in oklab, var(--accent) 13%, transparent);
}

.wall-label {
  margin-top: clamp(18px, 3vh, 26px);
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: .74rem;
  line-height: 1.75;
  letter-spacing: .04em;
  color: var(--ink-soft);
  text-transform: uppercase;
}
.wall-label strong { color: var(--ink); font-weight: 500; }
.wall-label em { font-style: normal; color: var(--accent-deep); }

.frame-tools {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  margin-top: 14px;
  position: relative;
  z-index: 4;
}
.tool-btn {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink);
  background: color-mix(in oklab, var(--paper) 72%, white);
  border: 1px solid var(--ink);
  padding: 0 16px;
  min-height: 44px;
  cursor: pointer;
  touch-action: manipulation;
  transition: background .18s, color .18s, border-color .18s;
}
.tool-btn:hover {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 4px 4px 0 var(--accent);
}
.tool-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--accent);
}
.tool-btn.flash {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
  color: #fff;
}
.tool-hint { font-size: .7rem; color: var(--ink-soft); letter-spacing: .06em; margin-left: auto; }

/* ============================================================
   EXHIBIT 01 — gradient mesh
   ============================================================ */
.mesh-stage {
  position: relative;
  height: clamp(320px, 48vw, 520px);
  touch-action: none;
  cursor: crosshair;
  background: #0f0f0d;
  overflow: hidden;
  border: 1px solid rgb(26 25 21 / .18);
}
.mesh-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(rgb(255 255 255 / .16) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / .16) 1px, transparent 1px),
    radial-gradient(circle at 50% 50%, transparent 0 55%, rgb(0 0 0 / .18) 100%);
  background-size: 64px 64px, 64px 64px, 100% 100%;
  mix-blend-mode: overlay;
}
.mesh-stage::after {
  content: "OKLAB FIELD / DRAG FIVE SOURCES";
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .16em;
  color: rgb(255 255 255 / .78);
  text-transform: uppercase;
  pointer-events: none;
}
#meshCv { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.mesh-pt {
  position: absolute;
  width: 44px; height: 44px;
  margin: -22px 0 0 -22px;
  border: none; padding: 0;
  background: transparent;
  cursor: grab;
  touch-action: none;
  z-index: 3;
}
.mesh-pt::before {
  content: ""; position: absolute; inset: 11px;
  border-radius: 50%;
  background: var(--pt-color, #888);
  box-shadow: 0 0 0 2px #fff, 0 0 0 3px rgb(26 25 21 / .45), 0 7px 16px rgb(26 25 21 / .35), 0 0 0 12px rgb(255 255 255 / .12);
  transition: transform .15s;
}
.mesh-pt::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 74px;
  height: 1px;
  background: rgb(255 255 255 / .6);
  transform: translateX(-50%);
  opacity: .65;
}
.mesh-pt:hover::before, .mesh-pt:focus-visible::before { transform: scale(1.25); }
.mesh-pt:active { cursor: grabbing; }
.mesh-pt:focus-visible { outline-offset: 6px; border-radius: 50%; }

/* ============================================================
   EXHIBIT 02 — ramp comparator
   ============================================================ */
.ramp-controls {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  padding: 12px;
  margin-bottom: 20px;
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, var(--accent-ghost), transparent 48%),
    color-mix(in oklab, var(--paper) 72%, white);
}
.ctl {
  font-size: .74rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-soft);
  display: inline-flex; gap: 8px; align-items: center;
}
.ctl output { color: var(--ink); font-variant-numeric: tabular-nums; min-width: 3.2em; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1 1 160px;
  max-width: 320px;
  height: 44px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px; background: var(--ink);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px;
  margin-top: -10px;
  background: var(--accent);
  border: 2px solid var(--ink);
  border-radius: 50%;
  transition: transform .16s var(--ease-out), box-shadow .16s var(--ease-out);
}
input[type="range"]::-moz-range-track { height: 2px; background: var(--ink); }
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  background: var(--accent);
  border: 2px solid var(--ink);
  border-radius: 50%;
  transition: transform .16s var(--ease-out), box-shadow .16s var(--ease-out);
}
input[type="range"]:hover::-webkit-slider-thumb,
input[type="range"]:focus-visible::-webkit-slider-thumb {
  transform: scale(1.16);
  box-shadow: 0 0 0 6px color-mix(in oklab, var(--accent) 18%, transparent);
}
input[type="range"]:hover::-moz-range-thumb,
input[type="range"]:focus-visible::-moz-range-thumb {
  transform: scale(1.16);
  box-shadow: 0 0 0 6px color-mix(in oklab, var(--accent) 18%, transparent);
}

#rampHue::-webkit-slider-runnable-track {
  height: 8px;
  background: linear-gradient(to right in oklch,
    oklch(65% 0.15 0), oklch(65% 0.15 60), oklch(65% 0.15 120),
    oklch(65% 0.15 180), oklch(65% 0.15 240), oklch(65% 0.15 300),
    oklch(65% 0.15 359));
  border-radius: 4px;
}
#rampHue::-webkit-slider-thumb { margin-top: -7px; }
#rampHue::-moz-range-track {
  height: 8px;
  background: linear-gradient(to right in oklch,
    oklch(65% 0.15 0), oklch(65% 0.15 60), oklch(65% 0.15 120),
    oklch(65% 0.15 180), oklch(65% 0.15 240), oklch(65% 0.15 300),
    oklch(65% 0.15 359));
  border-radius: 4px;
}

.ramp-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(16px, 3vw, 40px);
  padding: clamp(14px, 2vw, 24px);
  background: color-mix(in oklab, var(--paper) 62%, white);
  border: 1px solid var(--line);
}
.ramp-col {
  min-width: 0;
  position: relative;
}
.ramp-name {
  font-size: .74rem; letter-spacing: .14em; text-transform: uppercase;
  font-weight: 500; color: var(--ink-soft);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.ramp-name::after {
  content: "measured";
  color: var(--accent-deep);
  font-size: .62rem;
}
.ramp-col:nth-child(2) .ramp-name::after { content: "control"; color: var(--ink-mute); }
.ramp-row { display: flex; gap: 2px; }
.ramp-cell {
  flex: 1; min-width: 0;
  border: none; padding: 0;
  cursor: pointer;
  background: none;
  display: flex; flex-direction: column; gap: 6px;
  font-family: var(--font-mono);
}
.ramp-swatch {
  height: clamp(58px, 8vw, 96px);
  width: 100%;
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .06);
  transition: transform .15s;
}
.ramp-cell:hover .ramp-swatch, .ramp-cell:focus-visible .ramp-swatch { transform: scaleY(1.12); }
.ramp-lstar {
  font-size: .62rem;
  color: var(--ink-soft);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.delta-row {
  display: flex; gap: 3px;
  align-items: flex-end;
  height: 58px;
  margin-top: 8px;
  border-bottom: 1px solid var(--line);
  background:
    repeating-linear-gradient(to top, transparent 0 13px, rgb(26 25 21 / .06) 13px 14px);
}
.delta-bar { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; }
.delta-bar i { display: block; width: 60%; background: var(--accent); min-height: 1px; }
.delta-bar.rough i { background: var(--ink-soft); }
.ramp-verdict {
  margin-top: 10px;
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}
.ramp-proof {
  margin-top: 22px;
  padding: 16px 18px;
  background: var(--ink);
  border-left: 5px solid var(--accent);
  font-size: .8rem;
  letter-spacing: .03em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  box-shadow: 5px 5px 0 var(--accent-ghost);
}

/* ============================================================
   EXHIBIT 03 — simultaneous contrast
   ============================================================ */
.sc-stage {
  position: relative;
  height: clamp(240px, 36vw, 380px);
  display: flex;
  overflow: hidden;
  border: 1px solid rgb(26 25 21 / .16);
}
.sc-stage::before {
  content: "identical centre chips";
  position: absolute;
  left: 50%;
  top: 12px;
  z-index: 2;
  transform: translateX(-50%);
  background: rgb(255 255 255 / .76);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: 4px 8px;
}
.sc-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent calc(50% - 1px), rgb(255 255 255 / .7) calc(50% - 1px) calc(50% + 1px), transparent calc(50% + 1px)),
    repeating-linear-gradient(90deg, rgb(255 255 255 / .08) 0 1px, transparent 1px 44px);
  mix-blend-mode: overlay;
}
.sc-ground { flex: 1; }
.sc-a { background: oklch(33% 0.1 calc(var(--hue) + 160)); }
.sc-b { background: oklch(88% 0.055 calc(var(--hue) + 20)); }
.sc-seam {
  position: absolute; top: 0; bottom: 0; left: 50%;
  width: 1px; margin-left: -.5px;
  background: rgb(26 25 21 / .15);
}
.sc-chip {
  --chip-w: clamp(72px, 12vw, 120px);
  position: absolute;
  top: 50%;
  width: var(--chip-w);
  height: clamp(88px, 14vw, 150px);
  transform: translateY(-50%);
  background: oklch(66% 0.11 var(--hue));
  box-shadow: 0 14px 34px rgb(0 0 0 / .18), inset 0 0 0 1px rgb(255 255 255 / .08);
}
.sc-chip-l { left: calc(25% - var(--chip-w) / 2 + var(--meet, 0) * (25% - var(--chip-w) / 2)); }
.sc-chip-r { right: calc(25% - var(--chip-w) / 2 + var(--meet, 0) * (25% - var(--chip-w) / 2)); }

.sc-stage.joined .sc-seam { opacity: 0; }

.sc-controls {
  display: flex; flex-wrap: wrap; align-items: center; gap: 14px;
  margin-top: 16px;
  padding: 12px;
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--paper) 64%, white);
}
.sc-read {
  font-size: .72rem; letter-spacing: .05em; color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  margin-left: auto;
}
.sc-read.verified { color: var(--accent-deep); }

/* ============================================================
   EXHIBIT 04 — spectral ribbon
   ============================================================ */
.ex-ribbon .ex-head { margin-bottom: clamp(20px, 3vh, 36px); }

.ribbon-bleed { width: 100%; }
.ribbon-wrap {
  position: relative;
  height: clamp(158px, 23vw, 280px);
  cursor: crosshair;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  outline-offset: -4px;
  transition: box-shadow .24s var(--ease-out), filter .24s var(--ease-out);
}
.ribbon-wrap:hover,
.ribbon-wrap:focus-visible {
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / .62), 0 16px 56px -34px var(--accent);
}
.ribbon-wrap::after {
  content: "constant L 0.72 / constant C 0.135 / click to pin";
  position: absolute;
  left: clamp(14px, 4vw, 64px);
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgb(255 255 255 / .86);
  text-shadow: 0 1px 8px rgb(0 0 0 / .35);
  pointer-events: none;
}
#ribbonCv { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.ribbon-cursor {
  position: absolute; top: 0; bottom: 0;
  width: 1px;
  background: rgb(255 255 255 / .85);
  mix-blend-mode: difference;
  pointer-events: none;
  opacity: 0;
}
.ribbon-cursor span {
  position: absolute; top: 8px; left: 8px;
  font-size: .68rem;
  white-space: nowrap;
  background: var(--ink);
  color: var(--paper);
  padding: 3px 8px;
  letter-spacing: .04em;
  mix-blend-mode: normal;
}
.ribbon-wrap:hover .ribbon-cursor,
.ribbon-wrap:focus-visible .ribbon-cursor { opacity: 1; }

.stop-pin {
  position: absolute; top: 0; bottom: 0;
  width: 24px; margin-left: -12px;
  background: none; border: none;
  cursor: pointer;
  padding: 0;
}
.stop-pin::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: 50%;
  width: 1px; margin-left: -.5px;
  background: rgb(255 255 255 / .9);
  box-shadow: 0 0 0 .5px rgb(0 0 0 / .35);
}
.stop-pin::after {
  content: ""; position: absolute; left: 50%; bottom: 10px;
  width: 11px; height: 11px; margin-left: -6.5px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 1.5px rgb(26 25 21 / .55);
  transition: transform .15s;
}
.stop-pin:hover::after, .stop-pin:focus-visible::after { transform: scale(1.4); }

.stops-panel { margin-top: clamp(20px, 3vh, 32px); }
.stops-row {
  display: flex; flex-wrap: wrap; gap: 8px;
  min-height: 44px;
  position: relative;
  z-index: 4;
}
.stop-chip {
  display: inline-flex; align-items: center; gap: 9px;
  border: 1px solid var(--line);
  background: #fff;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .02em;
  padding: 0 12px 0 6px;
  min-height: 44px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.stop-chip:hover {
  border-color: var(--ink);
  background: color-mix(in oklab, white 82%, var(--accent-ghost));
}
.stop-chip.flash { background: var(--accent-deep); color: #fff; border-color: var(--accent-deep); }
.stop-chip .dot {
  width: 26px; height: 26px;
  background: var(--chip, #999);
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .12);
}
.stop-chip .pct { color: var(--ink-soft); }
.stop-chip.flash .pct { color: rgb(255 255 255 / .75); }

/* ============================================================
   FIELD NOTES
   ============================================================ */
.notes {
  border-top: 1px solid var(--line);
  padding: clamp(56px, 9vh, 110px) 0;
  background:
    linear-gradient(90deg, transparent 0 54%, color-mix(in oklab, var(--accent-ghost) 62%, transparent) 54% 54.25%, transparent 54.25%),
    linear-gradient(to bottom, transparent 0 72%, color-mix(in oklab, var(--paper-2) 72%, transparent)),
    var(--paper);
}
.notes .ex-head { padding-top: 0; }
.notes-list { list-style: none; border-top: 1px solid var(--ink); }
.note-row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) auto auto;
  gap: 8px 22px;
  align-items: baseline;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
  transition: background .2s, padding-left .2s;
}
.note-row:nth-child(odd) { background: color-mix(in oklab, white 32%, transparent); }
.note-row:hover { background: var(--accent-ghost); padding-left: 14px; }
.note-id { font-size: .74rem; color: var(--accent-deep); letter-spacing: .06em; }
.note-title { font-weight: 500; font-size: .98rem; }
.note-meta { font-size: .7rem; color: var(--ink-soft); letter-spacing: .04em; }
.note-status {
  font-size: .66rem; letter-spacing: .12em; text-transform: uppercase;
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--ink-soft);
}
.note-status::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--line);
}
.note-status.is-pub::before { background: var(--accent); }
.note-status.is-rev::before { background: oklch(75% 0.14 calc(var(--hue) + 90)); }
.note-status.is-on::before {
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: .25; } }

/* ============================================================
   COLOPHON
   ============================================================ */
.colophon {
  border-top: 1px solid var(--line);
  background: var(--paper-2);
  padding: clamp(56px, 9vh, 110px) 0;
}
.colophon-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
}
.col-title { font-size: clamp(2rem, 3.6vw, 3rem); }
.col-sub {
  font-size: .74rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent-deep);
  margin-bottom: 12px;
  font-weight: 500;
}
.col-block p { color: var(--ink-soft); font-size: .98rem; }
.col-block .col-title + p { color: var(--ink); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-foot {
  background: var(--ink);
  color: var(--paper);
}
.foot-strip {
  height: 6px;
  background: linear-gradient(to right in oklch,
    oklch(65% 0.16 calc(var(--hue) + 0)),
    oklch(65% 0.16 calc(var(--hue) + 90)),
    oklch(65% 0.16 calc(var(--hue) + 180)),
    oklch(65% 0.16 calc(var(--hue) + 270)),
    oklch(65% 0.16 calc(var(--hue) + 359)));
}
.foot-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(32px, 5vh, 56px) clamp(18px, 4vw, 40px);
  display: flex; flex-wrap: wrap; align-items: center; gap: 18px 40px;
}
.foot-mark {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: .05em;
}
.foot-links {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 26px;
  margin-left: auto;
  font-size: .74rem;
  letter-spacing: .06em;
}
.foot-links a, .foot-links span {
  color: oklch(80% 0.02 var(--hue));
  text-decoration: none;
  display: inline-flex; align-items: center;
  min-height: 44px;
}
.foot-links a:hover { color: #fff; text-decoration: underline; text-underline-offset: 4px; }

/* ============================================================
   MARGINALIA — vertical caption on the right edge (desktop)
   ============================================================ */
.marginalia {
  position: fixed;
  right: 12px; top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-size: .64rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--ink-soft);
  opacity: .55;
  pointer-events: none;
  z-index: 50;
  white-space: nowrap;
  max-height: 86vh;
  overflow: hidden;
}

/* ============================================================
   WALL SAMPLER — pointer chromatometer
   ============================================================ */
.wall-sampler {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 80;
  pointer-events: none;
  opacity: 0;
  filter: drop-shadow(0 10px 24px rgb(26 25 21 / .16));
  transition: opacity .18s var(--ease-out);
}
.wall-sampler.is-on { opacity: 1; }
.sampler-ring {
  position: absolute;
  left: -24px;
  top: -24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid color-mix(in oklab, var(--ink) 72%, white);
  background:
    radial-gradient(circle, transparent 0 9px, color-mix(in oklab, oklch(70% 0.18 var(--sample-hue)) 22%, transparent) 10px 18px, transparent 19px),
    conic-gradient(from -90deg in oklch,
      oklch(72% 0.16 calc(var(--sample-hue) - 34)),
      oklch(72% 0.16 calc(var(--sample-hue) + 34)),
      oklch(72% 0.16 calc(var(--sample-hue) + 146)),
      oklch(72% 0.16 calc(var(--sample-hue) - 34)));
  box-shadow: inset 0 0 0 12px rgb(255 255 255 / .82), 0 0 0 1px rgb(255 255 255 / .9);
}
.sampler-ring::before,
.sampler-ring::after {
  content: "";
  position: absolute;
  background: rgb(26 25 21 / .58);
}
.sampler-ring::before {
  left: 50%;
  top: -10px;
  bottom: -10px;
  width: 1px;
}
.sampler-ring::after {
  top: 50%;
  left: -10px;
  right: -10px;
  height: 1px;
}
.sampler-read {
  position: absolute;
  left: 18px;
  top: -30px;
  white-space: nowrap;
  background: color-mix(in oklab, white 88%, var(--paper-hot));
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 5px 8px;
  font-size: .62rem;
  line-height: 1;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.wall-sample-mark {
  position: fixed;
  z-index: 79;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  border: 1px solid var(--ink);
  background: oklch(70% 0.18 var(--sample-hue));
  box-shadow: 0 0 0 1px rgb(255 255 255 / .85);
  animation: sampleMark .85s var(--ease-out) forwards;
}
@keyframes sampleMark {
  to {
    opacity: 0;
    transform: translate(-50%, -50%) scale(3.8);
  }
}

/* ============================================================
   GUIDE — specimen sheet
   ============================================================ */
.guide-main {
  max-width: none;
  margin: 0;
  padding: clamp(54px, 9vh, 110px) clamp(18px, 7vw, 96px) clamp(58px, 9vh, 120px) clamp(18px, 11vw, 170px);
}
.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  gap: clamp(24px, 6vw, 96px);
  align-items: end;
  max-width: 1120px;
  padding-bottom: clamp(34px, 6vh, 72px);
  border-bottom: 1px solid var(--ink);
}
.guide-main .ex-title {
  margin-top: .06em;
  margin-bottom: 0;
  font-size: clamp(4.2rem, 11vw, 10rem);
  line-height: .94;
}
.guide-plate {
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--frame-shadow), var(--hard-shadow);
  padding: 14px;
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.guide-plate i {
  display: block;
  height: 92px;
  margin: 12px 0;
  background:
    linear-gradient(to right in oklch,
      oklch(65% .16 calc(var(--hue) + 0)),
      oklch(65% .16 calc(var(--hue) + 72)),
      oklch(65% .16 calc(var(--hue) + 144)),
      oklch(65% .16 calc(var(--hue) + 216)),
      oklch(65% .16 calc(var(--hue) + 288)),
      oklch(65% .16 calc(var(--hue) + 360)));
  border: 8px solid color-mix(in oklab, var(--paper) 72%, white);
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .12);
}
.guide-sec {
  max-width: 1120px;
  display: grid;
  grid-template-columns: minmax(140px, 220px) minmax(0, 760px);
  gap: clamp(18px, 4vw, 56px);
  margin-top: clamp(42px, 7vh, 76px);
  padding-top: 18px;
  border-top: 1px solid color-mix(in oklab, var(--ink) 68%, var(--line));
}
.guide-sec h2 {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: .78rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--accent-deep);
}
.guide-sec p {
  grid-column: 2;
  margin-bottom: 1em;
  max-width: 70ch;
}
.guide-sec h2 + p { margin-top: 0; }
.guide-sec code {
  font-family: var(--font-mono);
  font-size: .85em;
  background: var(--accent-ghost);
  border: 1px solid var(--line);
  padding: 1px 6px;
}
.tokens {
  grid-column: 2;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: 2px 0 18px;
}
.tokens li {
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, #fff, color-mix(in oklab, #fff 80%, var(--paper-hot))),
    #fff;
  padding: 13px 14px;
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.7;
  letter-spacing: .03em;
}
.tokens .tk {
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: .62rem;
  display: block;
}
.tokens .swl {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 6px;
  vertical-align: -1px;
  box-shadow: inset 0 0 0 1px rgb(26 25 21 / .15);
}
.repro {
  grid-column: 2;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  border-left: 5px solid var(--accent);
  box-shadow: var(--frame-shadow);
  padding: clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: .8rem;
  line-height: 1.8;
  letter-spacing: .02em;
}
.repro code {
  color: var(--ink);
  background: color-mix(in oklab, var(--paper) 82%, white);
}
.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--accent-deep);
}
.back-link:hover { text-decoration: underline; text-underline-offset: 4px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .marginalia { display: none; }
  .hero::after { display: none; }
  .wayfind { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .guide-hero { grid-template-columns: 1fr; }
  .guide-plate { max-width: 460px; }
  .colophon-grid { grid-template-columns: 1fr 1fr; }
  .colophon-grid .col-block:first-child { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .hero {
    min-height: auto;
    padding: 72px 18px 52px;
  }
  .hero::before {
    left: 18px;
    right: 18px;
    top: 78px;
  }
  .hero-title {
    font-size: clamp(6.8rem, 28vw, 8.4rem);
    letter-spacing: .04em;
  }
  .hero-grid { grid-template-columns: 1fr; }
  .wall-console {
    transform: none;
    box-shadow: var(--frame-shadow);
  }
  .console-head,
  .console-readouts {
    flex-wrap: wrap;
  }
  .calib { height: 72px; }
  .wayfind {
    margin: 0;
    padding: 20px 18px 72px;
  }
  .wayfind::before {
    left: 18px;
    right: 18px;
    top: -18px;
  }
  .ramp-pair { grid-template-columns: 1fr; gap: 30px; }
  .guide-main { padding: 56px 18px 72px; }
  .guide-sec {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .guide-sec p,
  .tokens,
  .repro {
    grid-column: 1;
  }
  .tokens { grid-template-columns: 1fr; }
  .note-row { grid-template-columns: 72px minmax(0, 1fr); }
  .note-meta { grid-column: 2; }
  .note-status { grid-column: 2; }
  .tool-hint { margin-left: 0; flex-basis: 100%; }
  .sc-read { margin-left: 0; flex-basis: 100%; }
  .foot-links { margin-left: 0; }
}

@media (max-width: 600px) {
  .hue-read { display: none; }
  .site-head { gap: 4px; padding: 0 8px; }
  .head-nav { gap: 0; }
  .navnum { min-width: 44px; font-size: .7rem; }
  .navtxt { min-width: 44px; padding: 0 5px; font-size: .68rem; }
  .nav-notes { display: none; }
  .wordmark { font-size: 1.55rem; letter-spacing: .07em; }
  .hue-station { gap: 0; }
  .wayfind { grid-template-columns: 1fr; }
  .way-card,
  .way-card:nth-child(even) {
    transform: none;
    min-height: 128px;
  }
  .way-card:hover,
  .way-card:nth-child(even):hover {
    transform: translateY(-4px);
  }
  .colophon-grid { grid-template-columns: 1fr; }
  .ex-num { font-size: clamp(10rem, 44vw, 13rem); }
  .ex-title { font-size: clamp(4rem, 16vw, 5.8rem); }
  .sc-stage::before,
  .mesh-stage::after,
  .ribbon-wrap::after {
    font-size: .58rem;
    letter-spacing: .1em;
  }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .lr { animation: none; opacity: 1; }
  .ht-o i::after { animation: none; }
  .calib-chip { animation: none; opacity: 1; transform: none; filter: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero::before { animation: none; opacity: .25; }
  .note-status.is-on::before { animation: none; }
  .way-card, .frame, .ramp-swatch, .mesh-pt::before, .stop-pin::after, .hue-wheel, .wall-sampler { transition: none; }
  input[type="range"]::-webkit-slider-thumb { transition: none; }
  input[type="range"]::-moz-range-thumb { transition: none; }
  .wall-sample-mark { animation: none; opacity: 0; }
}