:root {
  --ink: #181326;
  --muted: #625b70;
  --paper: #f8f5ed;
  --paper-2: #eee9dc;
  --violet: #5e2ff5;
  --violet-dark: #2a155d;
  --acid: #d9f25f;
  --cyan: #62d6e8;
  --orange: #ff9258;
  --red: #b72d48;
  --line: #272036;
  --focus: #056cff;
  --radius: 18px;
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html {
  background: var(--paper);
  color: var(--ink);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 300px;
  background:
    linear-gradient(90deg, transparent 0 23px, rgba(94,47,245,.08) 24px, transparent 25px) 0 0 / 48px 48px,
    var(--paper);
}

button,
input,
select { font: inherit; }

button,
a,
input[type="radio"],
input[type="range"] { -webkit-tap-highlight-color: transparent; }

button,
.topbar a,
.card-directory a,
.handoff a {
  min-height: 46px;
}

button:focus-visible,
a:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 3px;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 1000;
  left: 1rem;
  top: 1rem;
  padding: .8rem 1rem;
  border: 2px solid var(--ink);
  background: var(--acid);
  font-weight: 900;
  transform: translateY(-180%);
}

.skip-link:focus { transform: none; }

.topbar {
  position: sticky;
  z-index: 80;
  top: 0;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  align-items: stretch;
  border-bottom: 2px solid var(--line);
  background: rgba(248,245,237,.96);
  backdrop-filter: blur(12px);
}

.brand {
  display: grid;
  grid-template-columns: 54px auto;
  align-content: center;
  column-gap: .8rem;
  padding: .55rem 1rem;
  text-decoration: none;
}

.brand > span {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 50px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--violet);
  color: white;
  font-weight: 1000;
}

.brand strong { align-self: end; letter-spacing: .06em; }
.brand small { align-self: start; color: var(--muted); font-size: .67rem; letter-spacing: .13em; }

.topbar nav,
.language-switch { display: flex; align-items: stretch; }

.topbar nav a,
.language-switch button {
  display: grid;
  place-items: center;
  padding: .7rem 1rem;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  text-decoration: none;
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .05em;
}

.topbar nav a[aria-current="page"],
.language-switch button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

.language-switch button { cursor: pointer; }

main { overflow: clip; }

.hero {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) 210px;
  gap: clamp(1.2rem, 3vw, 3.5rem);
  align-items: center;
  min-height: 610px;
  padding: clamp(3rem, 8vw, 7rem) clamp(1rem, 5vw, 5rem);
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(circle at 82% 24%, rgba(217,242,95,.72) 0 11%, transparent 11.4%),
    linear-gradient(135deg, rgba(98,214,232,.28), transparent 45%),
    var(--paper);
}

.stage-mark {
  display: grid;
  justify-items: center;
  padding: 1rem;
  border: 2px solid var(--line);
  border-radius: 999px;
  background: var(--ink);
  color: white;
  box-shadow: 12px 12px 0 var(--cyan);
}

.stage-mark span,
.stage-mark small { font-size: .7rem; font-weight: 900; letter-spacing: .17em; }
.stage-mark strong { font-size: clamp(4rem, 9vw, 7.5rem); line-height: .9; }

.hero-copy > p:first-child,
.section-heading > p,
.card-question > p,
.card-directory > header > p,
.handoff > div > p:first-child {
  margin: 0 0 .8rem;
  color: var(--violet);
  font-size: .75rem;
  font-weight: 1000;
  letter-spacing: .16em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.6rem, 6.8vw, 6.7rem);
  line-height: .92;
  letter-spacing: -.06em;
}

.hero h1 span,
.hero h1 em { display: block; }
.hero h1 em { color: var(--violet); font-style: normal; }
.hero-copy > p:not(:first-child) { max-width: 760px; font-size: clamp(1rem, 1.5vw, 1.2rem); line-height: 1.7; }

.hero-chips { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.5rem; }
.hero-chips span {
  padding: .55rem .8rem;
  border: 1.5px solid var(--line);
  background: white;
  font-size: .72rem;
  font-weight: 1000;
  letter-spacing: .08em;
  box-shadow: 4px 4px 0 var(--ink);
}

.boundary-stamp {
  display: grid;
  justify-items: center;
  gap: .35rem;
  padding: 1.4rem .8rem;
  border: 3px double var(--line);
  background: var(--acid);
  transform: rotate(3deg);
  text-align: center;
}

.boundary-stamp span,
.boundary-stamp small { font-size: .68rem; font-weight: 1000; letter-spacing: .12em; }
.boundary-stamp strong { font-size: 3.8rem; line-height: .8; }

.metric-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-bottom: 2px solid var(--line);
  background: white;
}

.metric-strip article {
  display: grid;
  gap: .2rem;
  min-height: 118px;
  align-content: center;
  padding: 1rem clamp(.7rem, 2vw, 1.5rem);
  border-right: 1px solid var(--line);
}

.metric-strip article:last-child { border-right: 0; }
.metric-strip strong { color: var(--violet); font-size: 2.25rem; line-height: 1; }
.metric-strip span { font-size: .78rem; font-weight: 800; }

.validation-bar {
  padding: .85rem 1rem;
  border-bottom: 2px solid var(--line);
  background: var(--ink);
  color: var(--acid);
  text-align: center;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
}

.noscript-note {
  margin: 0;
  padding: 1rem clamp(1rem, 5vw, 5rem);
  border-bottom: 2px solid var(--line);
  background: #fff1b8;
  color: var(--ink);
  font-weight: 800;
  line-height: 1.55;
}

[data-js-control]:disabled { cursor: not-allowed; opacity: .55; }

.simulator-section,
.card-directory,
.result-board,
.handoff {
  padding: clamp(3rem, 7vw, 6.5rem) clamp(1rem, 5vw, 5rem);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(130px, .28fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.section-heading h2,
.card-directory h2,
.handoff h2 {
  margin: 0;
  max-width: 950px;
  font-size: clamp(2rem, 4.8vw, 4.8rem);
  line-height: 1;
  letter-spacing: -.045em;
}

.section-heading div > p,
.card-directory header div > p,
.handoff > div > p:last-child { max-width: 840px; line-height: 1.7; }

.simulator-section {
  border-bottom: 2px solid var(--line);
  background: var(--violet-dark);
  color: white;
}

.simulator-section .section-heading > p { color: var(--acid); }

.simulator-shell {
  max-width: 1320px;
  margin: auto;
  padding: clamp(1rem, 3vw, 2.2rem);
  border: 2px solid white;
  border-radius: 28px;
  background: #251b37;
  box-shadow: 18px 18px 0 var(--acid);
}

.axis-chooser {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .65rem;
  margin: 0 0 1.5rem;
  padding: 0;
  border: 0;
}

.axis-chooser legend {
  width: 100%;
  margin-bottom: .7rem;
  font-weight: 1000;
}

.axis-chooser label,
.direction-options label {
  position: relative;
  display: grid;
  min-height: 50px;
  place-items: center;
  border: 1.5px solid rgba(255,255,255,.55);
  border-radius: 12px;
  cursor: pointer;
  font-size: .83rem;
  font-weight: 900;
}

.axis-chooser input,
.direction-options input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: .01;
}

.axis-chooser label:has(input:checked),
.direction-options label:has(input:checked) {
  border-color: var(--acid);
  background: var(--acid);
  color: var(--ink);
}

.axis-chooser label:has(input:focus-visible),
.direction-options label:has(input:focus-visible) { outline: 4px solid white; outline-offset: 3px; }

.simulator-scenes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.sim-scene {
  --sim-light-rgb: 244, 239, 224;
  --sim-highlight: .72;
  --sim-brightness: 1;
  --sim-blur: 12px;
  --light-x: 50%;
  --light-y: 9%;
  --highlight-x: 50%;
  --highlight-y: 12%;
  --shadow-x: 0px;
  --shadow-y: 34px;
  min-width: 0;
  margin: 0;
  border: 1.5px solid rgba(255,255,255,.55);
  border-radius: 18px;
  background: #11101a;
}

.sim-scene figcaption {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .8rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.35);
}

.sim-scene figcaption span {
  display: grid;
  width: 32px;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  background: var(--acid);
  color: var(--ink);
  font-weight: 1000;
}

.sim-stage {
  position: relative;
  min-height: clamp(260px, 32vw, 440px);
  overflow: visible;
  background:
    linear-gradient(to bottom, #1a1728 0 66%, #2a2732 66% 100%);
}

.sim-object {
  position: absolute;
  z-index: 3;
  left: 50%;
  top: 48%;
  width: clamp(120px, 25vw, 230px);
  aspect-ratio: 1.35;
  transform: translate(-50%, -50%);
  clip-path: polygon(9% 19%, 74% 7%, 94% 38%, 78% 82%, 23% 94%, 3% 58%);
  border: 2px solid rgba(255,255,255,.65);
  background: radial-gradient(circle at var(--highlight-x) var(--highlight-y), rgba(var(--sim-light-rgb), var(--sim-highlight)) 0 9%, rgba(var(--sim-light-rgb), .38) 25%, #695d7e 64%, #251f34 100%);
  filter: brightness(var(--sim-brightness));
  transition: background .18s linear, filter .18s linear;
}

.sim-object::after {
  content: "";
  position: absolute;
  inset: 10% 18% 45% 15%;
  border-top: 2px solid rgba(255,255,255,.38);
  transform: rotate(-8deg);
}

.sim-shadow {
  position: absolute;
  z-index: 2;
  left: 50%;
  top: 63%;
  width: clamp(130px, 26vw, 250px);
  height: 54px;
  border-radius: 50%;
  background: repeating-linear-gradient(110deg, rgba(0,0,0,.7) 0 6px, rgba(0,0,0,.45) 6px 12px);
  filter: blur(var(--sim-blur));
  transform: translate(calc(-50% + var(--shadow-x)), var(--shadow-y)) skewX(-18deg);
  transform-origin: center;
  opacity: .82;
  transition: transform .18s linear, filter .18s linear, opacity .18s linear;
}

.sim-light {
  position: absolute;
  z-index: 4;
  left: var(--light-x);
  top: var(--light-y);
  color: rgb(var(--sim-light-rgb));
  font-size: 2rem;
  filter: drop-shadow(0 0 12px rgb(var(--sim-light-rgb)));
  transform: translate(-50%, -50%);
}

.sim-direction-arrow {
  position: absolute;
  z-index: 5;
  left: var(--light-x);
  top: var(--light-y);
  color: white;
  font-size: 2.1rem;
  transform: translate(8px, 18px) rotate(var(--arrow-rotation, 90deg));
  transform-origin: left center;
}

.sim-scene[data-direction="front"] { --light-x: 50%; --light-y: 8%; --highlight-x: 50%; --highlight-y: 8%; --shadow-x: 0px; --shadow-y: 42px; --arrow-rotation: 90deg; }
.sim-scene[data-direction="left-45"] { --light-x: 16%; --light-y: 17%; --highlight-x: 18%; --highlight-y: 15%; --shadow-x: 45px; --shadow-y: 32px; --arrow-rotation: 34deg; }
.sim-scene[data-direction="side"] { --light-x: 9%; --light-y: 48%; --highlight-x: 8%; --highlight-y: 48%; --shadow-x: 72px; --shadow-y: 10px; --arrow-rotation: 0deg; }
.sim-scene[data-direction="back"] { --light-x: 50%; --light-y: 88%; --highlight-x: 50%; --highlight-y: 94%; --shadow-x: 0px; --shadow-y: -76px; --arrow-rotation: -90deg; }

.sim-scene[data-intensity="10"] { --sim-highlight: .16; --sim-brightness: .56; }
.sim-scene[data-intensity="20"] { --sim-highlight: .24; --sim-brightness: .64; }
.sim-scene[data-intensity="30"] { --sim-highlight: .32; --sim-brightness: .72; }
.sim-scene[data-intensity="40"] { --sim-highlight: .42; --sim-brightness: .8; }
.sim-scene[data-intensity="50"] { --sim-highlight: .52; --sim-brightness: .9; }
.sim-scene[data-intensity="60"] { --sim-highlight: .62; --sim-brightness: 1; }
.sim-scene[data-intensity="70"] { --sim-highlight: .7; --sim-brightness: 1.08; }
.sim-scene[data-intensity="80"] { --sim-highlight: .78; --sim-brightness: 1.16; }
.sim-scene[data-intensity="90"] { --sim-highlight: .86; --sim-brightness: 1.24; }
.sim-scene[data-intensity="100"] { --sim-highlight: .94; --sim-brightness: 1.32; }

.sim-scene[data-softness="0"], .sim-scene[data-softness="10"] { --sim-blur: 0px; }
.sim-scene[data-softness="20"], .sim-scene[data-softness="30"] { --sim-blur: 4px; }
.sim-scene[data-softness="40"], .sim-scene[data-softness="50"] { --sim-blur: 8px; }
.sim-scene[data-softness="60"], .sim-scene[data-softness="70"] { --sim-blur: 13px; }
.sim-scene[data-softness="80"], .sim-scene[data-softness="90"], .sim-scene[data-softness="100"] { --sim-blur: 20px; }

.sim-scene[data-temperature="2700"], .sim-scene[data-temperature="2800"], .sim-scene[data-temperature="2900"], .sim-scene[data-temperature="3000"], .sim-scene[data-temperature="3100"], .sim-scene[data-temperature="3200"], .sim-scene[data-temperature="3300"], .sim-scene[data-temperature="3400"], .sim-scene[data-temperature="3500"] { --sim-light-rgb: 255, 180, 105; }
.sim-scene[data-temperature="3600"], .sim-scene[data-temperature="3700"], .sim-scene[data-temperature="3800"], .sim-scene[data-temperature="3900"], .sim-scene[data-temperature="4000"], .sim-scene[data-temperature="4100"], .sim-scene[data-temperature="4200"], .sim-scene[data-temperature="4300"], .sim-scene[data-temperature="4400"], .sim-scene[data-temperature="4500"], .sim-scene[data-temperature="4600"], .sim-scene[data-temperature="4700"], .sim-scene[data-temperature="4800"], .sim-scene[data-temperature="4900"], .sim-scene[data-temperature="5000"] { --sim-light-rgb: 246, 236, 215; }
.sim-scene[data-temperature="5100"], .sim-scene[data-temperature="5200"], .sim-scene[data-temperature="5300"], .sim-scene[data-temperature="5400"], .sim-scene[data-temperature="5500"], .sim-scene[data-temperature="5600"], .sim-scene[data-temperature="5700"], .sim-scene[data-temperature="5800"], .sim-scene[data-temperature="5900"], .sim-scene[data-temperature="6000"], .sim-scene[data-temperature="6100"], .sim-scene[data-temperature="6200"], .sim-scene[data-temperature="6300"], .sim-scene[data-temperature="6400"], .sim-scene[data-temperature="6500"] { --sim-light-rgb: 174, 211, 255; }

.sim-controls {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .8rem;
}

.sim-controls fieldset {
  min-width: 0;
  margin: 0;
  padding: 1rem;
  border: 1px solid rgba(255,255,255,.42);
  border-radius: 14px;
  background: rgba(255,255,255,.04);
}

.sim-controls fieldset[data-active="false"] { opacity: .58; }
.sim-controls legend { display: flex; justify-content: space-between; gap: 1rem; width: 100%; padding: 0 .35rem; font-weight: 900; }
.sim-controls output { color: var(--acid); font-variant-numeric: tabular-nums; }

.direction-options { display: grid; grid-template-columns: repeat(4, 1fr); gap: .45rem; }
.direction-options label { min-height: 46px; }

.range-row { display: grid; grid-template-columns: 48px minmax(0, 1fr) 48px; gap: .65rem; align-items: center; }
.range-row button,
.simulator-actions button,
.card-actions button,
.pack-actions button {
  border: 1.5px solid currentColor;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font-weight: 900;
}

.range-row button { min-height: 46px; font-size: 1.3rem; }
.range-row button:disabled { cursor: not-allowed; opacity: .45; }

input[type="range"] {
  width: 100%;
  min-height: 46px;
  accent-color: var(--acid);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb { width: 30px; height: 30px; }
input[type="range"]::-moz-range-thumb { width: 30px; height: 30px; }

.simulator-reading {
  display: grid;
  gap: .7rem;
  margin-top: 1rem;
  padding: 1rem;
  border-left: 7px solid var(--acid);
  background: rgba(255,255,255,.08);
}

.simulator-reading p { margin: 0; line-height: 1.6; }
.simulator-reading p:first-child { display: grid; gap: .3rem; }
.simulator-reading strong { color: var(--acid); font-size: .72rem; letter-spacing: .1em; }
.truth-note { padding-top: .7rem; border-top: 1px solid rgba(255,255,255,.35); }

.simulator-actions,
.card-actions,
.pack-actions,
.handoff-actions { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1rem; }
.simulator-actions button,
.card-actions button,
.pack-actions button { padding: .75rem 1rem; }
.simulator-actions button:first-child,
.card-actions button:first-child,
.pack-actions button { background: var(--acid); color: var(--ink); }

.sr-status {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.card-directory {
  border-bottom: 2px solid var(--line);
  background: var(--acid);
}

.card-directory nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 2px solid var(--line);
  border-left: 2px solid var(--line);
}

.card-directory a {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: .4rem .65rem;
  align-items: center;
  padding: 1rem;
  border-right: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: var(--paper);
  text-decoration: none;
}

.card-directory a > span {
  grid-row: span 2;
  display: grid;
  width: 34px;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  background: var(--violet);
  color: white;
  font-size: .75rem;
  font-weight: 1000;
}

.card-directory a strong { font-size: .82rem; line-height: 1.25; }
.card-directory a small { color: var(--muted); font-size: .61rem; letter-spacing: .08em; }
.card-directory .pack-actions { justify-content: flex-end; }

.card-stack { background: var(--paper-2); }

.experiment-card {
  border-bottom: 2px solid var(--line);
  background: var(--paper);
}

.experiment-card > summary {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  min-height: 128px;
  padding: 1.25rem clamp(1rem, 5vw, 5rem);
  cursor: pointer;
  list-style: none;
}

.experiment-card > summary::-webkit-details-marker { display: none; }
.experiment-card > summary::after { content: "+"; margin-left: .8rem; font-size: 2rem; font-weight: 300; }
.experiment-card[open] > summary::after { content: "−"; }

.experiment-card > summary > span {
  display: grid;
  width: 68px;
  aspect-ratio: 1;
  place-items: center;
  border: 2px solid var(--line);
  border-radius: 50%;
  background: white;
  font-size: 1.4rem;
  font-weight: 1000;
}

.experiment-card > summary small { color: var(--violet); font-weight: 900; letter-spacing: .08em; }
.experiment-card > summary h3 { margin: .25rem 0 0; font-size: clamp(1.4rem, 3vw, 2.6rem); line-height: 1; }
.experiment-card > summary > b { padding: .45rem .65rem; border: 1.5px solid var(--line); background: var(--acid); font-size: .68rem; letter-spacing: .08em; }

.card-body { padding: 0 clamp(1rem, 5vw, 5rem) clamp(3rem, 7vw, 6rem); }

.card-question {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: .5rem 2rem;
  margin-bottom: 1.5rem;
  padding: 1.4rem;
  border: 2px solid var(--line);
  background: var(--cyan);
}

.card-question p { grid-row: span 2; }
.card-question h4 { margin: 0; font-size: clamp(1.2rem, 2.4vw, 2rem); }
.card-question blockquote { margin: 0; color: #312b40; }

.plan-pair,
.print-plan-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.lighting-plan {
  min-width: 0;
  margin: 0;
  border: 2px solid var(--line);
  background: white;
}

.lighting-plan > header {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: .8rem;
  align-items: center;
  padding: .8rem;
  border-bottom: 1.5px solid var(--line);
}

.lighting-plan > header > span {
  display: grid;
  width: 44px;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: white;
  font-weight: 1000;
}

.lighting-plan h4 { margin: 0 0 .2rem; font-size: 1rem; }
.lighting-plan > header p { margin: 0; color: var(--red); font-size: .64rem; font-weight: 900; letter-spacing: .08em; }

.plan-board {
  position: relative;
  min-height: 300px;
  border-bottom: 1.5px solid var(--line);
  background:
    linear-gradient(rgba(94,47,245,.09) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(90deg, rgba(94,47,245,.09) 1px, transparent 1px) 0 0 / 32px 32px,
    #f2effa;
}

.plan-board::before,
.plan-board::after {
  content: "";
  position: absolute;
  background: rgba(94,47,245,.25);
}
.plan-board::before { left: 50%; top: 0; width: 1px; height: 100%; }
.plan-board::after { top: 50%; left: 0; width: 100%; height: 1px; }

.plan-node {
  position: absolute;
  z-index: 2;
  display: grid;
  width: 48px;
  aspect-ratio: 1;
  place-items: center;
  border: 2px solid var(--line);
  border-radius: 50%;
  background: white;
  transform: translate(-50%, -50%);
}

.plan-node[data-slot="center"] { left: 50%; top: 50%; }
.plan-node[data-slot="north"] { left: 50%; top: 12%; }
.plan-node[data-slot="north-east"] { left: 82%; top: 18%; }
.plan-node[data-slot="east"] { left: 88%; top: 50%; }
.plan-node[data-slot="south-east"] { left: 80%; top: 78%; }
.plan-node[data-slot="south"] { left: 50%; top: 87%; }
.plan-node[data-slot="south-west"] { left: 20%; top: 78%; }
.plan-node[data-slot="west"] { left: 12%; top: 50%; }
.plan-node[data-slot="north-west"] { left: 20%; top: 20%; }
.plan-node[data-slot="back"] { left: 50%; top: 4%; }

.lighting-plan[data-lesson="lesson-02"][data-distance-band="near"] .subject-node { left: 32%; }
.lighting-plan[data-lesson="lesson-02"][data-distance-band="far"] .subject-node { left: 68%; }
.lighting-plan[data-lesson="lesson-03"][data-distance-band="near"] .source-node { left: 30%; }
.lighting-plan[data-lesson="lesson-03"][data-distance-band="far"] .source-node { left: 5%; }

.source-node { background: var(--acid); }
.source-node[data-temperature="warm"] { background: #ffd29f; }
.source-node[data-temperature="cool"] { background: #baeaff; }
.source-node[data-role="off"] { background: #d6d1dd; }
.source-node i { position: absolute; left: 43px; top: 12px; font-size: 1.7rem; font-style: normal; transform-origin: -18px 12px; }
.source-node[data-slot="west"] i { transform: rotate(0deg); }
.source-node[data-slot="north-west"] i { transform: rotate(38deg); }
.source-node[data-slot="north"] i { transform: rotate(90deg); }
.source-node[data-slot="north-east"] i { transform: rotate(142deg); }
.source-node[data-slot="east"] i { transform: rotate(180deg); }
.source-node[data-slot="south-east"] i { transform: rotate(-142deg); }
.source-node[data-slot="south"] i { transform: rotate(-90deg); }
.source-node[data-slot="south-west"] i { transform: rotate(-38deg); }
.modifier-node { border-radius: 5px; background: var(--cyan); }
.modifier-node[data-modifier="flag"] { background: var(--ink); color: white; }
.modifier-node[data-modifier="safety-marker"] { background: #ffcad3; }
.subject-node { width: 64px; border-radius: 15px; background: var(--violet); color: white; font-size: 1.6rem; }
.observer-node { background: white; font-size: 1.3rem; }

.plan-legend {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .4rem;
  margin: 0;
  padding: .8rem;
  border-bottom: 1.5px solid var(--line);
  list-style: none;
}

.plan-legend li { display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: 0 .5rem; align-items: center; min-width: 0; }
.plan-legend small { grid-column: 2; color: var(--muted); font-size: .58rem; overflow-wrap: anywhere; }
.legend-symbol { grid-row: span 2; display: grid; place-items: center; width: 24px; aspect-ratio: 1; border: 1px solid var(--line); }

.lighting-plan figcaption { display: grid; gap: .45rem; padding: .8rem; }
.lighting-plan figcaption p { margin: 0; line-height: 1.45; overflow-wrap: anywhere; }
.lighting-plan figcaption p:not(:last-child) { display: grid; grid-template-columns: 80px minmax(0, 1fr); gap: .5rem; }
.lighting-plan figcaption strong { color: var(--violet); font-size: .66rem; letter-spacing: .05em; }
.lighting-plan figcaption > p:last-child { padding-top: .55rem; border-top: 1px dashed #aaa2b2; color: var(--muted); font-size: .78rem; }

.result-example {
  margin-top: 1rem;
  border: 2px solid var(--line);
  background: var(--ink);
  color: white;
}

.result-example > header {
  display: grid;
  grid-template-columns: minmax(180px, .4fr) 1fr;
  gap: 1rem;
  align-items: end;
  padding: 1rem;
  border-bottom: 1px solid rgba(255,255,255,.45);
}
.result-example > header span { color: var(--acid); font-size: .66rem; font-weight: 1000; letter-spacing: .1em; }
.result-example h4 { margin: .25rem 0 0; font-size: 1.25rem; }
.result-example > header p { margin: 0; font-size: .78rem; line-height: 1.45; }
.prediction-pair { display: grid; grid-template-columns: 1fr 1fr; }
.prediction-panel { padding: 1rem; border-right: 1px solid rgba(255,255,255,.4); }
.prediction-panel:last-child { border-right: 0; }
.prediction-panel header { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.prediction-panel header > span { display: grid; width: 30px; aspect-ratio: 1; place-items: center; border-radius: 50%; background: var(--acid); color: var(--ink); font-weight: 1000; }
.prediction-panel p { margin: .7rem 0 .25rem; }
.prediction-panel small { color: #d8d2e4; }

.prediction-stage {
  --p-light: 20%;
  --p-object: #d9d3e8;
  --p-shadow-x: 36px;
  --p-shadow-blur: 4px;
  --p-brightness: 1;
  position: relative;
  min-height: 180px;
  margin-top: .7rem;
  background: linear-gradient(#29243a 0 63%, #3c3745 63%);
}
.prediction-object { position: absolute; z-index: 2; left: 50%; top: 47%; width: 115px; aspect-ratio: 1.25; transform: translate(-50%,-50%); clip-path: polygon(12% 15%, 78% 8%, 94% 48%, 72% 87%, 18% 90%, 4% 50%); background: var(--p-object); filter: brightness(var(--p-brightness)); border: 2px solid white; }
.prediction-shadow { position: absolute; left: 50%; top: 64%; width: 128px; height: 30px; border-radius: 50%; background: repeating-linear-gradient(120deg, #030207 0 5px, #26212f 5px 10px); transform: translate(calc(-50% + var(--p-shadow-x)), 8px); filter: blur(var(--p-shadow-blur)); }
.prediction-light { position: absolute; left: var(--p-light); top: 18%; color: var(--acid); font-size: 1.7rem; }

.prediction-panel[data-render-token="front"] .prediction-stage,
.prediction-panel[data-render-token="paper-front"] .prediction-stage { --p-light: 50%; --p-shadow-x: 0px; }
.prediction-panel[data-render-token="side"] .prediction-stage,
.prediction-panel[data-render-token="paper-side"] .prediction-stage { --p-light: 12%; --p-shadow-x: 50px; }
.prediction-panel[data-render-token="near"] .prediction-stage { --p-brightness: 1.35; }
.prediction-panel[data-render-token="far"] .prediction-stage { --p-brightness: .62; }
.prediction-panel[data-render-token="hard"] .prediction-stage,
.prediction-panel[data-render-token="baseline"] .prediction-stage { --p-shadow-blur: 0px; }
.prediction-panel[data-render-token="soft"] .prediction-stage,
.prediction-panel[data-render-token="modified"] .prediction-stage { --p-shadow-blur: 13px; }
.prediction-panel[data-render-token="key"] .prediction-stage,
.prediction-panel[data-render-token="no-bounce"] .prediction-stage { --p-object: linear-gradient(90deg, #dfd9ec 0 43%, #332d3e 56%); }
.prediction-panel[data-render-token="three-light"] .prediction-stage,
.prediction-panel[data-render-token="bounce"] .prediction-stage { --p-object: linear-gradient(90deg, #eee9f7, #8d829d); }
.prediction-panel[data-render-token="window"] .prediction-stage,
.prediction-panel[data-render-token="cool"] .prediction-stage { --p-object: #c8e4ff; }
.prediction-panel[data-render-token="warm"] .prediction-stage { --p-object: #ffd2a0; }
.prediction-panel[data-render-token="unsafe"] .prediction-stage::after { content: "!"; position: absolute; right: 1rem; top: 1rem; display: grid; width: 42px; aspect-ratio: 1; place-items: center; border: 3px solid white; border-radius: 50%; color: white; font-size: 1.5rem; font-weight: 1000; }
.prediction-panel[data-render-token="safe"] .prediction-stage::after { content: "✓"; position: absolute; right: 1rem; top: 1rem; display: grid; width: 42px; aspect-ratio: 1; place-items: center; border: 3px solid white; border-radius: 50%; color: white; font-size: 1.4rem; font-weight: 1000; }

.result-example > footer { padding: .9rem 1rem; border-top: 1px solid rgba(255,255,255,.4); }
.result-example > footer strong { color: var(--acid); font-size: .68rem; letter-spacing: .08em; }
.result-example > footer p { display: inline; margin-left: .7rem; }

.card-method {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 1rem;
  border-top: 2px solid var(--line);
  border-left: 2px solid var(--line);
}
.card-method > div { padding: 1rem; border-right: 2px solid var(--line); border-bottom: 2px solid var(--line); background: white; }
.card-method h4 { margin: 0 0 .5rem; color: var(--violet); }
.card-method h5 { margin: 1rem 0 .4rem; }
.card-method p { line-height: 1.5; }
.card-method ul,
.card-method ol { padding-left: 1.2rem; }
.card-method li { margin: .45rem 0; line-height: 1.45; }

.evidence-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 2px solid var(--line);
  border-top: 0;
  background: var(--cyan);
}
.evidence-strip > div { padding: 1rem; border-right: 1px solid var(--line); }
.evidence-strip > div:last-child { border-right: 0; }
.evidence-strip strong { font-size: .68rem; letter-spacing: .07em; }
.evidence-strip p { margin: .4rem 0 0; line-height: 1.45; }

.consent-strip { margin-top: 1rem; padding: 1rem; border: 2px solid var(--line); background: #e7ffe0; }
.consent-strip[data-consent-mode="paper-face-default-human-optional"] { border-color: var(--red); background: #fff0f1; }
.consent-strip strong { color: var(--red); font-size: .72rem; letter-spacing: .08em; }
.consent-strip p { margin: .5rem 0 0; line-height: 1.6; }

.card-safety { margin-top: 1rem; padding: 1rem; border: 2px solid var(--line); background: white; }
.card-safety h4 { margin: 0 0 .8rem; }
.safety-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: .5rem; margin: 0; padding: 0; list-style: none; }
.safety-list li { display: grid; gap: .25rem; padding: .7rem; border: 1px solid #b9b2c2; }
.safety-list strong { color: var(--red); font-size: .66rem; }
.safety-list span { font-size: .78rem; line-height: 1.4; }
.card-safety > p { margin: .8rem 0 0; padding-top: .8rem; border-top: 1px dashed #aba3b4; }
.card-safety > p strong { margin-right: .6rem; color: var(--violet); }

.card-actions { justify-content: flex-end; }
.card-actions button { padding: .75rem 1rem; color: var(--ink); }
.card-actions button:first-child { color: var(--ink); }

.result-board {
  border-bottom: 2px solid var(--line);
  background: #e4ddff;
}
.result-board figure { max-width: 1200px; margin: auto; border: 2px solid var(--line); background: var(--ink); color: white; box-shadow: 18px 18px 0 var(--acid); }
.result-board img { display: block; width: 100%; height: auto; border-bottom: 2px solid white; }
.result-board figcaption ol { display: grid; grid-template-columns: repeat(2, 1fr); margin: 0; padding: 0; list-style: none; }
.result-board figcaption li { display: grid; grid-template-columns: 34px minmax(0,1fr); gap: .6rem; align-items: center; padding: .8rem 1rem; border-right: 1px solid rgba(255,255,255,.35); border-bottom: 1px solid rgba(255,255,255,.35); }
.result-board figcaption li span { display: grid; width: 30px; aspect-ratio: 1; place-items: center; border-radius: 50%; background: var(--acid); color: var(--ink); font-weight: 1000; }
.result-board figcaption > p { display: grid; gap: .4rem; margin: 0; padding: 1rem; }
.result-board figcaption > p strong { color: var(--acid); font-size: .68rem; letter-spacing: .1em; }
.result-board figcaption > p span { overflow-wrap: anywhere; font-size: .68rem; }

.handoff {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(340px, .8fr);
  gap: 3rem;
  border-bottom: 2px solid var(--line);
  background: var(--paper);
}
.handoff ul { margin: 0; padding: 0; border-top: 2px solid var(--line); list-style: none; }
.handoff li { display: grid; grid-template-columns: 88px minmax(0,1fr) auto; gap: .7rem; align-items: center; min-height: 68px; padding: .7rem; border: 2px solid var(--line); border-top: 0; background: white; }
.handoff li > span { color: var(--violet); font-weight: 1000; }
.handoff li b { padding: .35rem .5rem; background: var(--acid); font-size: .65rem; }
.handoff-actions { grid-column: 1 / -1; }
.handoff a { display: inline-grid; place-items: center; padding: .8rem 1rem; border: 2px solid var(--line); background: var(--violet); color: white; text-decoration: none; font-weight: 900; }
.handoff a:last-child { background: white; color: var(--ink); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem clamp(1rem, 5vw, 5rem);
  background: var(--ink);
  color: white;
}
.site-footer > div { display: grid; gap: .35rem; }
.site-footer > div:last-child { justify-items: end; }
.site-footer span { color: #d6d0df; font-size: .72rem; }
.site-footer b { color: var(--acid); }

.projector-exit { display: none; }

body[data-projector="true"] { background: var(--paper); }
body[data-projector="true"] .projector-exit {
  position: fixed;
  z-index: 200;
  right: 1rem;
  top: 1rem;
  display: block;
  padding: .75rem 1rem;
  border: 3px solid white;
  background: var(--red);
  color: white;
  font-weight: 1000;
}
body[data-projector="true"] .topbar,
body[data-projector="true"] main > * { display: none; }
body[data-projector="true"][data-projector-card="simulator"] .simulator-section { display: block; min-height: 100vh; padding-top: 5rem; }
body[data-projector="true"] .card-stack { display: block; }
body[data-projector="true"] .experiment-card { display: none; }
body[data-projector="true"][data-projector-card="experiment-01"] #experiment-01,
body[data-projector="true"][data-projector-card="experiment-02"] #experiment-02,
body[data-projector="true"][data-projector-card="experiment-03"] #experiment-03,
body[data-projector="true"][data-projector-card="experiment-04"] #experiment-04,
body[data-projector="true"][data-projector-card="experiment-05"] #experiment-05,
body[data-projector="true"][data-projector-card="experiment-06"] #experiment-06,
body[data-projector="true"][data-projector-card="experiment-07"] #experiment-07,
body[data-projector="true"][data-projector-card="experiment-08"] #experiment-08,
body[data-projector="true"][data-projector-card="experiment-09"] #experiment-09,
body[data-projector="true"][data-projector-card="experiment-10"] #experiment-10 { display: block; min-height: 100vh; }
body[data-projector="true"] .experiment-card > summary { padding-top: 5rem; }
body[data-projector="true"] .card-body { padding-bottom: 4rem; }
body[data-projector="true"] .screen-only.card-actions { display: flex; }

.print-pack { display: none; }

@media (max-width: 1040px) {
  .topbar { grid-template-columns: minmax(200px,1fr) auto; }
  .topbar nav { grid-column: 1 / -1; order: 3; border-top: 1px solid var(--line); }
  .topbar nav a { flex: 1; }
  .hero { grid-template-columns: 110px minmax(0,1fr); }
  .boundary-stamp { grid-column: 1 / -1; max-width: 300px; justify-self: end; }
  .card-directory nav { grid-template-columns: repeat(2, 1fr); }
  .card-method,
  .evidence-strip { grid-template-columns: 1fr; }
  .card-method > div,
  .evidence-strip > div { border-right: 2px solid var(--line); border-bottom: 2px solid var(--line); }
  .handoff { grid-template-columns: 1fr; }
}

@media (max-width: 780px) {
  .hero { min-height: 0; grid-template-columns: 1fr; }
  .stage-mark { justify-self: start; width: 120px; }
  .boundary-stamp { justify-self: start; }
  .metric-strip { grid-template-columns: repeat(2, 1fr); }
  .metric-strip article { border-bottom: 1px solid var(--line); }
  .section-heading { grid-template-columns: 1fr; gap: .4rem; }
  .axis-chooser { grid-template-columns: repeat(2, 1fr); }
  .simulator-scenes,
  .sim-controls,
  .plan-pair,
  .print-plan-pair { grid-template-columns: 1fr; }
  .experiment-card > summary { grid-template-columns: 58px minmax(0,1fr); }
  .experiment-card > summary > span { width: 54px; }
  .experiment-card > summary > b { grid-column: 2; justify-self: start; }
  .card-question { grid-template-columns: 1fr; }
  .card-question p { grid-row: auto; }
  .result-example > header { grid-template-columns: 1fr; }
  .safety-list { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; }
  .site-footer > div:last-child { justify-items: start; }
}

@media (max-width: 520px) {
  .brand { grid-template-columns: 46px auto; }
  .brand > span { width: 42px; }
  .language-switch button { padding-inline: .65rem; }
  .topbar nav a { padding: .65rem .35rem; font-size: .64rem; }
  .hero,
  .simulator-section,
  .card-directory,
  .result-board,
  .handoff { padding-inline: .8rem; }
  .metric-strip { grid-template-columns: 1fr; }
  .metric-strip article { min-height: 90px; }
  .axis-chooser,
  .direction-options,
  .card-directory nav { grid-template-columns: 1fr; }
  .simulator-shell { padding: .75rem; border-radius: 14px; box-shadow: 8px 8px 0 var(--acid); }
  .sim-stage { min-height: 250px; }
  .range-row { grid-template-columns: 46px minmax(90px,1fr) 46px; }
  .card-body,
  .experiment-card > summary { padding-inline: .8rem; }
  .prediction-pair { grid-template-columns: 1fr; }
  .prediction-panel { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.4); }
  .plan-board { min-height: 260px; }
  .plan-legend { grid-template-columns: 1fr; }
  .lighting-plan figcaption p:not(:last-child) { grid-template-columns: 1fr; }
  .result-board figure { box-shadow: 8px 8px 0 var(--acid); }
  .result-board figcaption ol { grid-template-columns: 1fr; }
  .handoff li { grid-template-columns: 72px minmax(0,1fr); }
  .handoff li b { grid-column: 2; justify-self: start; }
  .card-actions,
  .simulator-actions,
  .handoff-actions { flex-direction: column; }
  .card-actions button,
  .simulator-actions button,
  .handoff a { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

@media (forced-colors: active) {
  body,
  .hero,
  .simulator-section,
  .simulator-shell,
  .card-directory,
  .card-stack,
  .result-board,
  .handoff { background: Canvas; color: CanvasText; }
  .topbar,
  .experiment-card,
  .lighting-plan,
  .result-example,
  .result-board figure { background: Canvas; color: CanvasText; border-color: CanvasText; }
  .stage-mark,
  .brand > span,
  .experiment-card > summary > span,
  .lighting-plan > header > span,
  .card-directory a > span,
  .axis-chooser label:has(input:checked),
  .direction-options label:has(input:checked) { background: Highlight; color: HighlightText; }
  .plan-board,
  .sim-stage,
  .prediction-stage { background: Canvas; border: 2px solid CanvasText; }
  .plan-node,
  .sim-object,
  .prediction-object { background: Canvas; color: CanvasText; border: 3px solid CanvasText; clip-path: none; }
  .sim-shadow,
  .prediction-shadow { background: repeating-linear-gradient(45deg, CanvasText 0 3px, Canvas 3px 7px); filter: none; border: 2px solid CanvasText; opacity: 1; }
  .sim-light,
  .sim-direction-arrow,
  .source-node i { color: LinkText; filter: none; }
  .consent-strip,
  .evidence-strip,
  .card-question { background: Canvas; color: CanvasText; border-color: CanvasText; }
  button,
  a { forced-color-adjust: auto; }
}

@page { size: A4 portrait; margin: 8mm; }

@media print {
  :root { color-scheme: light; font-size: 9pt; }
  html,
  body { width: auto; margin: 0; background: white; color: black; }
  .screen-only,
  .skip-link { display: none !important; }
  .print-pack { display: none; }
  body:not([data-print-target]) main { display: block; }
  body[data-print-target] main { display: none !important; }
  body[data-print-target] .print-pack { display: block; }
  .print-card,
  .print-simulator { display: none; }
  body[data-print-target="all"] .print-card,
  body[data-print-target="experiment-01"] [data-print-card-sheet="experiment-01"],
  body[data-print-target="experiment-02"] [data-print-card-sheet="experiment-02"],
  body[data-print-target="experiment-03"] [data-print-card-sheet="experiment-03"],
  body[data-print-target="experiment-04"] [data-print-card-sheet="experiment-04"],
  body[data-print-target="experiment-05"] [data-print-card-sheet="experiment-05"],
  body[data-print-target="experiment-06"] [data-print-card-sheet="experiment-06"],
  body[data-print-target="experiment-07"] [data-print-card-sheet="experiment-07"],
  body[data-print-target="experiment-08"] [data-print-card-sheet="experiment-08"],
  body[data-print-target="experiment-09"] [data-print-card-sheet="experiment-09"],
  body[data-print-target="experiment-10"] [data-print-card-sheet="experiment-10"],
  body[data-print-target="simulator"] .print-simulator { display: grid; }
  .print-card,
  .print-simulator {
    min-height: 275mm;
    break-after: page;
    page-break-after: always;
    align-content: start;
    gap: 3mm;
  }
  body[data-print-target^="experiment-"] .print-card,
  body[data-print-target="all"] [data-print-card-sheet="experiment-10"],
  .print-simulator { break-after: auto; page-break-after: auto; }
  .print-card > header,
  .print-simulator > header { display: grid; grid-template-columns: auto 1fr auto; gap: 4mm; align-items: center; padding-bottom: 2mm; border-bottom: 1.4pt solid black; }
  .print-card h2,
  .print-simulator h2 { margin: 0; font-size: 17pt; }
  .print-plan-pair { grid-template-columns: 1fr 1fr; gap: 3mm; }
  .print-card .lighting-plan { break-inside: avoid; border: 1pt solid black; }
  .print-card .lighting-plan > header { padding: 2mm; }
  .print-card .plan-board { min-height: 46mm; background: white; }
  .print-card .plan-node { width: 8mm; border: 1pt solid black; background: white; color: black; }
  .print-card .subject-node { width: 10mm; }
  .print-card .source-node i { font-size: 12pt; }
  .print-card .plan-legend { grid-template-columns: 1fr 1fr; padding: 2mm; gap: 1mm; }
  .print-card .plan-legend small { font-size: 5.5pt; }
  .print-card .lighting-plan figcaption { padding: 2mm; gap: 1mm; font-size: 7pt; }
  .print-card .lighting-plan figcaption > p:last-child { display: none; }
  .print-method { display: grid; grid-template-columns: 1fr 1fr; gap: 2mm; }
  .print-method > div { padding: 2mm; border: .8pt solid black; break-inside: avoid; }
  .print-method strong,
  .print-evidence strong,
  .print-safety > strong { font-size: 7pt; letter-spacing: .04em; }
  .print-method p,
  .print-method ul,
  .print-method ol,
  .print-evidence p,
  .print-safety p { margin: 1mm 0 0; line-height: 1.25; }
  .print-method ul,
  .print-method ol { padding-left: 4mm; }
  .print-evidence,
  .print-safety { padding: 2mm; border: 1pt solid black; }
  .print-safety .safety-list { grid-template-columns: 1fr 1fr; gap: 1mm; }
  .print-safety .safety-list li { padding: 1.2mm; border: .5pt solid black; }
  .print-safety .safety-list span { font-size: 6.5pt; }
  .print-card > footer,
  .print-simulator > footer { display: flex; justify-content: space-between; gap: 4mm; margin-top: auto; padding-top: 2mm; border-top: 1pt solid black; font-size: 6.5pt; }
  .print-sim-scenes { display: grid; grid-template-columns: 1fr 1fr; gap: 4mm; }
  .print-sim-scenes > div,
  .print-simulator > section { min-height: 60mm; padding: 5mm; border: 1.4pt solid black; }
  .print-sim-scenes p,
  .print-simulator section p { line-height: 1.5; }
}