:root {
  --paper: #f5f3ed;
  --ink: #171716;
  --teal: #2c8e82;
  --cyan: #14d9da;
  --orange: #ff592e;
  --magenta: #b82e7a;
  --blue: #2833ae;
  --yellow: #fff000;
  --line: rgba(23, 23, 22, .24);
  --muted: rgba(23, 23, 22, .56);
  --frame-gutter: 0px;
  --scene-pin-top: 86px;
  color: var(--ink);
  background: #ed8d9e;
  font-family: var(--font-sans);
}

* { box-sizing: border-box; }
html, body { min-width: 320px; min-height: 100%; margin: 0; }
html { scroll-padding-top: var(--scene-pin-top); }
body { background: #ed8d9e url("public/chapter-3/rainbow-frame.png") center / cover fixed; }
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 190;
  pointer-events: none;
  opacity: .022;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
a:focus-visible, button:focus-visible { outline: 1px solid var(--ink); outline-offset: 4px; }

.c3-header {
  position: fixed;
  top: var(--frame-gutter);
  right: var(--frame-gutter);
  left: var(--frame-gutter);
  z-index: 90;
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  min-height: 57px;
  padding: 14px 22px 10px;
  border-bottom: 0;
  background: transparent;
  font-size: 8px;
  line-height: 1.2;
  letter-spacing: .09em;
  text-transform: uppercase;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: none;
}
.c3-header__back { width: max-content; }
.c3-header__back:hover { text-decoration: underline; text-underline-offset: 4px; }
.c3-header__title { display: flex; flex-direction: column; align-items: center; gap: 3px; text-align: center; }
.c3-header__title strong { font-family: var(--font-display); font-size: 11px; letter-spacing: .03em; }
.c3-header__level { justify-self: end; text-align: right; }
.c3-header__level span, .c3-header__level strong { display: block; }
.c3-header__level strong { margin-top: 3px; color: var(--orange); }

.c3-archive-mode {
  position: fixed;
  top: calc(var(--frame-gutter) + 66px);
  left: 50%;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 6px;
  letter-spacing: .09em;
  text-align: center;
  text-transform: uppercase;
  transform: translateX(-50%);
}
.c3-mode-switch { display: block; width: max-content; padding: 2px 5px 4px; cursor: pointer; }
.rainbow-flag { position: relative; display: grid; width: 24px; height: 15px; grid-template-rows: repeat(6, 1fr); border: 1px solid #171716; transform-origin: left center; transition: transform 520ms cubic-bezier(.22, 1, .36, 1); }
.rainbow-flag i { display: block; }
.rainbow-flag i:nth-child(1) { background: #f35d27; }
.rainbow-flag i:nth-child(2) { background: #fff100; }
.rainbow-flag i:nth-child(3) { background: #049978; }
.rainbow-flag i:nth-child(4) { background: #397f7f; }
.rainbow-flag i:nth-child(5) { background: #5984c9; }
.rainbow-flag i:nth-child(6) { background: #993370; }
.c3-mode-switch:hover .rainbow-flag,
.c3-mode-switch:focus-visible .rainbow-flag { transform: scaleX(1.2) translateY(-1px); }
.c3-mode-switch.is-launching .rainbow-flag { transform: scaleX(.7); }

.mode-transition { position: fixed; inset: 0; z-index: 240; display: grid; grid-template-rows: repeat(6, 1fr); pointer-events: none; }
.mode-transition span { display: block; transform: scaleX(0); transition: transform 520ms cubic-bezier(.76, 0, .24, 1) var(--delay); }
.mode-transition span:nth-child(odd) { transform-origin: left center; }
.mode-transition span:nth-child(even) { transform-origin: right center; }
.mode-transition span:nth-child(1) { background: #e83843; }
.mode-transition span:nth-child(2) { background: #ee8233; }
.mode-transition span:nth-child(3) { background: #efcf39; }
.mode-transition span:nth-child(4) { background: #4b9b59; }
.mode-transition span:nth-child(5) { background: #4880b8; }
.mode-transition span:nth-child(6) { background: #76539d; }
.mode-transition.is-active span { transform: scaleX(1); }

.c3-web { display: block; min-height: 100vh; padding: 57px 0 29px; background: transparent; }
.c3-publication { min-width: 0; }
.c3-publication__heading { position: sticky; top: 57px; z-index: 40; display: grid; grid-template-columns: 1fr 1fr 1fr; padding: 9px 22px 7px; border-bottom: 0; background: transparent; box-shadow: none; font-size: 7px; letter-spacing: .09em; text-transform: uppercase; backdrop-filter: none; -webkit-backdrop-filter: none; }
.c3-publication__heading strong { text-align: center; }
.c3-publication__heading span:last-child { text-align: right; }

.c3-layer-scenes { overflow: clip; }
.c3-layer-scene {
  --text-opacity: 0;
  --text-reveal: -12%;
  --text-edge: 0%;
  --text-blur: 2.2px;
  --text-y: 9px;
  --visual-opacity: 0;
  --visual-reveal: -10%;
  --visual-edge: 1%;
  --visual-blur: 2.8px;
  --visual-scale: .986;
  --frame-scale: .94;
  --frame-y: 24px;
  --paper-z: -10px;
  --paper-rest-x: 2.6deg;
  --paper-rest-y: -1.2deg;
  --paper-motion-x: 0deg;
  --paper-motion-y: 0deg;
  --paper-motion-roll: 0deg;
  --paper-shadow-y: 18px;
  --paper-shadow-blur: 48px;
  --paper-sheen: .12;
  position: relative;
  height: 225vh;
  height: 225svh;
  border-bottom: 0;
}
.c3-layer-stage {
  position: sticky;
  top: var(--scene-pin-top);
  display: grid;
  height: calc(100vh - 115px);
  height: calc(100svh - 115px);
  min-height: 560px;
  place-items: center;
  overflow: hidden;
  padding: 8px 18px 12px;
  background: #ed8d9e url("public/chapter-3/rainbow-frame.png") center / cover;
  isolation: isolate;
  perspective: 1600px;
  perspective-origin: 50% 44%;
}
.c3-pdf-frame {
  position: relative;
  width: min(calc(100vw - 36px), calc((100svh - 135px) * 1.414216));
  aspect-ratio: 2646 / 1871;
  overflow: hidden;
  background: var(--scene-bg);
  border: 0;
  outline: 0;
  border-radius: .12% .12% .75% .75% / .12% .12% .45% .45%;
  box-shadow: 0 var(--paper-shadow-y) var(--paper-shadow-blur) rgba(0, 0, 0, .68);
  transform: translate3d(0, var(--frame-y), var(--paper-z))
    rotateX(calc(var(--paper-rest-x) + var(--paper-motion-x)))
    rotateY(calc(var(--paper-rest-y) + var(--paper-motion-y)))
    rotateZ(var(--paper-motion-roll))
    scale(var(--frame-scale));
  transform-origin: center center;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  will-change: transform;
}
.c3-pdf-frame::before,
.c3-pdf-frame::after { content: ""; position: absolute; inset: 0; z-index: 5; pointer-events: none; }
.c3-pdf-frame::before {
  opacity: var(--paper-sheen);
  background: linear-gradient(96deg, rgba(255,255,255,.28) 0, transparent 18%, transparent 72%, rgba(255,255,255,.18) 100%);
  mix-blend-mode: soft-light;
}
.c3-pdf-frame::after {
  top: auto;
  bottom: 0;
  height: 2.2%;
  opacity: var(--paper-sheen);
  background: radial-gradient(ellipse at 50% 118%, rgba(23,23,22,.34), transparent 68%);
  transform: translateZ(1px);
}
.c3-pdf-ground { position: absolute; inset: 0; background: var(--scene-bg); }
.c3-pdf-layer { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: fill; }
.c3-pdf-layer--text {
  z-index: 1;
  opacity: var(--text-opacity);
  filter: blur(var(--text-blur));
  mask-image: linear-gradient(105deg, #000 0, #000 var(--text-reveal), transparent var(--text-edge));
  -webkit-mask-image: linear-gradient(105deg, #000 0, #000 var(--text-reveal), transparent var(--text-edge));
  transform: translate3d(0, var(--text-y), 0);
  will-change: opacity, filter, transform, mask-image;
}
.c3-pdf-layer--complete {
  z-index: 2;
  opacity: var(--visual-opacity);
  filter: blur(var(--visual-blur));
  mask-image: linear-gradient(112deg, #000 0, #000 var(--visual-reveal), transparent var(--visual-edge));
  -webkit-mask-image: linear-gradient(112deg, #000 0, #000 var(--visual-reveal), transparent var(--visual-edge));
  transform: scale(var(--visual-scale));
  transform-origin: center center;
  will-change: opacity, filter, transform, mask-image;
}
.c3-scene-meta { position: absolute; top: 14px; right: 18px; left: 18px; z-index: 8; display: flex; justify-content: space-between; color: rgba(255,255,255,.92); font-size: 6px; letter-spacing: .09em; text-shadow: 0 1px 4px rgba(23,23,22,.24); text-transform: uppercase; }
.c3-layer-readout { position: absolute; right: 18px; bottom: 13px; left: 18px; z-index: 10; display: flex; gap: 16px; color: rgba(255,255,255,.94); font-size: 6px; letter-spacing: .09em; text-shadow: 0 1px 4px rgba(23,23,22,.28); text-transform: uppercase; }
.c3-layer-readout span { opacity: .22; transition: opacity 220ms ease; }
.c3-layer-scene[data-layer="latent"] .c3-layer-readout span:nth-child(1),
.c3-layer-scene[data-layer="signal"] .c3-layer-readout span:nth-child(2),
.c3-layer-scene[data-layer="recognition"] .c3-layer-readout span:nth-child(3),
.c3-layer-scene[data-layer="resolved"] .c3-layer-readout span:nth-child(4) { opacity: 1; }
.c3-layer-action { position: absolute; right: 18px; bottom: 11px; z-index: 12; padding: 7px 0; border: 0; border-bottom: 1px solid currentColor; background: transparent; color: #fff; font-size: 6px; letter-spacing: .09em; cursor: pointer; opacity: var(--visual-opacity); pointer-events: none; text-shadow: 0 1px 4px rgba(23,23,22,.28); transform: translateY(var(--button-shift, 12px)); text-transform: uppercase; }
.c3-layer-scene[data-layer="resolved"] .c3-layer-action { pointer-events: auto; }

.c3-lab {
  --symbol-colour: var(--cyan);
  --symbol-rotation: 0deg;
  --symbol-spread: 0px;
  --symbol-void: .18;
  display: grid;
  min-height: calc(100vh - 86px - var(--frame-gutter) * 2);
  grid-template-columns: minmax(390px, 1.05fr) minmax(390px, .95fr);
  scroll-margin-top: 86px;
  border-bottom: 1px solid var(--ink);
  background: transparent;
}
.c3-lab[hidden],
.c3-layer-action { display: none !important; }
.c3-lab__source { position: sticky; top: var(--scene-pin-top); align-self: start; height: calc(100vh - 115px); min-height: 650px; overflow: hidden; padding: 28px 22px; border-right: 1px solid var(--ink); background: rgba(44, 142, 130, .86); backdrop-filter: blur(14px); }
.c3-lab__source-meta, .c3-lab__readout { position: relative; z-index: 8; display: flex; justify-content: space-between; font-size: 6px; letter-spacing: .09em; text-transform: uppercase; }
.c3-lab__source h2 { position: relative; z-index: 8; max-width: 420px; margin: 24px 0 0; font-family: var(--font-display); font-size: clamp(36px, 4vw, 68px); font-weight: 400; line-height: .82; letter-spacing: -.045em; }
.c3-lab__source-title { position: relative; z-index: 8; margin: 10px 0 0; font-size: 7px; letter-spacing: .08em; text-transform: uppercase; }
.c3-source-page { position: absolute; inset: 23% 8% 13%; margin: 0; transition: opacity 240ms ease, transform 620ms cubic-bezier(.16, 1, .3, 1); }
.c3-source-page img { display: block; width: 100%; height: 100%; border: 1px solid var(--ink); background: var(--paper); object-fit: contain; box-shadow: 8px 11px 0 rgba(23,23,22,.15); }
.c3-source-page figcaption { display: flex; justify-content: space-between; padding-top: 6px; font-size: 6px; letter-spacing: .08em; }
.c3-lab__readout { position: absolute; right: 22px; bottom: 18px; left: 22px; }
.c3-lab__readout span:last-child { text-align: right; }

.c3-symbol { position: absolute; right: 6%; bottom: 8%; z-index: 12; width: clamp(150px, 17vw, 270px); aspect-ratio: 1; filter: drop-shadow(0 0 24px color-mix(in srgb, var(--symbol-colour) 30%, transparent)); transform: rotate(var(--symbol-rotation)); transition: filter 520ms ease, transform 820ms cubic-bezier(.16, 1, .3, 1); }
.c3-symbol > span { position: absolute; display: block; transition: all 780ms cubic-bezier(.16, 1, .3, 1); }
.c3-symbol__halo { inset: 5%; border: 1px solid color-mix(in srgb, var(--symbol-colour) 62%, transparent); border-radius: 50%; transform: translate(var(--symbol-spread), calc(var(--symbol-spread) * -.5)); }
.c3-symbol__orbit { inset: 13%; border: 2px dashed var(--symbol-colour); border-radius: 50%; animation: c3-orbit 24s linear infinite; }
.c3-symbol__core { inset: 21%; border-radius: 48% 52% 63% 37% / 37% 48% 52% 63%; background: var(--symbol-colour); transform: rotate(24deg) scale(.92); animation: c3-breathe 5.5s ease-in-out infinite alternate; }
.c3-symbol__cut { z-index: 3; background: var(--teal); }
.c3-symbol__cut--one { top: 12%; left: 48%; width: 8%; height: 76%; transform: rotate(34deg) translateX(var(--symbol-spread)); }
.c3-symbol__cut--two { top: 44%; left: 13%; width: 73%; height: 5%; transform: rotate(-12deg) translateY(calc(var(--symbol-spread) * -.5)); }
.c3-symbol__trace { z-index: 5; border: 1px solid var(--symbol-colour); border-radius: 50%; }
.c3-symbol__trace--one { inset: 27% 17% 19% 30%; transform: translate(calc(var(--symbol-spread) * 1.4), calc(var(--symbol-spread) * -.7)); }
.c3-symbol__trace--two { inset: 18% 32% 31% 15%; transform: translate(calc(var(--symbol-spread) * -1.2), var(--symbol-spread)); }
.c3-symbol__void { z-index: 7; top: 50%; left: 50%; width: calc(46% * var(--symbol-void)); aspect-ratio: 1; border-radius: 50%; background: var(--teal); transform: translate(-50%, -50%); }
.c3-lab[data-result="code"] .c3-symbol__core { border-radius: 50%; clip-path: polygon(50% 0, 62% 34%, 100% 50%, 62% 66%, 50% 100%, 38% 66%, 0 50%, 38% 34%); }
.c3-lab[data-result="label"] .c3-symbol__core { border-radius: 4%; transform: rotate(-6deg) skew(-7deg); }
.c3-lab[data-result="performance"] .c3-symbol__core { border-radius: 64% 36% 29% 71% / 43% 61% 39% 57%; transform: rotate(58deg) scale(1.05); }
.c3-lab[data-result="trace"] .c3-symbol__core { opacity: .25; transform: scale(.72); }
.c3-lab[data-result="blank"] .c3-symbol__core { opacity: .08; transform: scale(.55); }
.c3-lab[data-result="blank"] .c3-symbol__void { width: 68%; }

.c3-lab__interaction { min-width: 0; padding: 24px clamp(24px, 3vw, 52px) 70px; }
.c3-question-rail { display: grid; margin: 0 0 40px; padding: 0; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); list-style: none; }
.c3-question-rail li { display: grid; min-height: 48px; grid-template-columns: 20px 1fr; gap: 5px; padding: 7px; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); color: var(--muted); font-size: 6px; line-height: 1.1; text-transform: uppercase; }
.c3-question-rail li.is-active { color: var(--paper); background: var(--ink); }
.c3-question-rail li.is-complete { box-shadow: inset 0 -4px var(--cyan); }
.c3-question-rail li.is-blank { box-shadow: inset 0 -4px var(--paper); text-decoration: line-through; }
.c3-question__label, .c3-result__number { color: var(--orange); font-size: 7px; letter-spacing: .12em; text-transform: uppercase; }
.c3-question__kicker, .c3-result > p:first-of-type { margin: 16px 0 0; color: var(--muted); font-size: 6px; letter-spacing: .11em; text-transform: uppercase; }
.c3-question h2 { margin: 24px 0 0; font-family: var(--font-zh); font-size: clamp(24px, 2.5vw, 42px); font-weight: 300; line-height: 1.12; letter-spacing: -.035em; }
.c3-question__en { margin: 12px 0 0; font-family: var(--font-display); font-size: clamp(22px, 2.25vw, 38px); line-height: .88; letter-spacing: -.035em; }
.c3-question__note { margin: 22px 0 0; padding-top: 9px; border-top: 1px solid var(--ink); color: var(--muted); font-family: var(--font-zh); font-size: 10px; line-height: 1.5; }
.c3-options { display: grid; margin-top: 24px; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.c3-option { position: relative; min-height: 112px; overflow: hidden; padding: 12px; border: 0; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--paper); text-align: left; cursor: pointer; transition: color 180ms ease, transform 420ms cubic-bezier(.16, 1, .3, 1); }
.c3-option::after { content: ""; position: absolute; inset: 0; z-index: 0; background: var(--option-colour, var(--cyan)); opacity: .12; transition: opacity 240ms ease; }
.c3-option img { position: absolute; inset: 0; z-index: 0; width: 100%; height: 100%; object-fit: cover; mix-blend-mode: multiply; opacity: .2; filter: saturate(.75); }
.c3-option span, .c3-option strong { position: relative; z-index: 2; display: block; }
.c3-option span { font-family: var(--font-zh); font-size: 11px; }
.c3-option strong { margin-top: 8px; font-size: 6px; font-weight: 400; letter-spacing: .08em; text-transform: uppercase; }
.c3-option:hover { transform: translateY(-3px); }
.c3-option:hover::after { opacity: .34; }
.c3-option.is-selected { color: var(--paper); background: var(--ink); }
.c3-option.is-selected::after { opacity: .42; }
.c3-option.is-selected img { opacity: .26; filter: grayscale(1) contrast(1.4); }
.c3-pause { display: flex; width: 100%; justify-content: space-between; margin-top: 13px; padding: 11px 12px; border: 1px dashed var(--ink); background: transparent; color: var(--muted); font-size: 7px; letter-spacing: .08em; cursor: pointer; }
.c3-pause strong { font-family: var(--font-zh); font-size: 9px; font-weight: 400; }
.c3-pause:hover, .c3-pause.is-selected { color: var(--paper); background: var(--ink); }
.c3-actions { display: flex; justify-content: space-between; margin-top: 20px; }
.c3-actions button, .c3-restart { padding: 8px 0; border: 0; border-bottom: 1px solid currentColor; background: transparent; font-size: 7px; letter-spacing: .1em; cursor: pointer; text-transform: uppercase; }
.c3-actions button:disabled { color: var(--muted); cursor: default; opacity: .45; }
.c3-result h2 { margin: 28px 0 0; color: var(--orange); font-family: var(--font-display); font-size: clamp(68px, 7vw, 118px); font-weight: 600; line-height: .7; letter-spacing: -.07em; }
.c3-result h3 { margin: 20px 0 0; font-family: var(--font-zh); font-size: clamp(22px, 2vw, 35px); font-weight: 300; }
.c3-result__zh { margin: 26px 0 0; padding-top: 12px; border-top: 1px solid var(--ink); font-family: var(--font-zh); font-size: 12px; line-height: 1.6; }
.c3-result__en { margin: 10px 0 0; color: var(--muted); font-size: 9px; line-height: 1.55; }
.c3-result__warning { display: grid; margin-top: 24px; grid-template-columns: 98px 1fr; gap: 14px; padding: 12px; border: 1px dashed var(--ink); color: var(--muted); font-size: 8px; line-height: 1.45; }
.c3-result__warning strong { color: var(--orange); font-size: 7px; letter-spacing: .08em; }
.c3-restart { margin-top: 26px; }

.c3-footer { position: fixed; right: 0; bottom: 0; left: 0; z-index: 100; display: grid; grid-template-columns: 1fr 1fr 1fr; min-height: 29px; padding: 8px 22px 6px; border-top: 0; background: transparent; box-shadow: none; color: rgba(23,23,22,.72); font-size: 7px; letter-spacing: .08em; text-transform: uppercase; backdrop-filter: none; -webkit-backdrop-filter: none; }
.c3-footer span:nth-child(2) { color: var(--ink); text-align: center; }
.c3-footer span:last-child { text-align: right; }

@keyframes c3-orbit { to { transform: rotate(360deg); } }
@keyframes c3-breathe { from { scale: .94; } to { scale: 1.035; } }

@media (max-width: 1050px) {
  .c3-web { grid-template-columns: 275px minmax(0, 1fr); }
  .c3-lab { grid-template-columns: 1fr; }
  .c3-lab__source { position: relative; top: auto; height: 72vh; min-height: 560px; border-right: 0; border-bottom: 1px solid var(--ink); }
}

@media (max-width: 720px) {
  :root { --frame-gutter: 0px; --scene-pin-top: 86px; }
  .c3-header { grid-template-columns: 1fr 1fr; padding-right: 14px; padding-left: 14px; }
  .c3-header__title { align-items: flex-end; text-align: right; }
  .c3-header__level { display: none; }
  .c3-archive-mode { top: calc(var(--frame-gutter) + 63px); }
  .c3-web { display: block; }
  .c3-publication__heading { top: calc(var(--frame-gutter) + 57px); padding-right: 14px; padding-left: 14px; }
  .c3-publication__heading span:first-child,
  .c3-publication__heading strong { display: none; }
  .c3-publication__heading { display: flex; justify-content: flex-end; }
  .c3-layer-scene { height: 210vh; height: 210svh; }
  .c3-layer-stage { top: var(--scene-pin-top); height: calc(100vh - 115px); height: calc(100svh - 115px); min-height: 520px; padding: 12px 8px 18px; }
  .c3-pdf-frame { width: min(calc(100vw - 16px), calc((100svh - 145px) * 1.414216)); max-width: none; }
  .c3-scene-meta { right: 14px; left: 14px; }
  .c3-layer-readout { right: 14px; bottom: 14px; left: 14px; gap: 10px; }
  .c3-layer-action { right: 14px; bottom: 12px; }
  .c3-lab__source { min-height: 520px; height: 68vh; padding-right: 14px; padding-left: 14px; }
  .c3-source-page { inset: 24% 5% 15%; }
  .c3-symbol { width: 42vw; }
  .c3-lab__interaction { padding: 28px 18px 80px; }
  .c3-options { grid-template-columns: 1fr; }
  .c3-footer { grid-template-columns: 1fr auto; padding-right: 14px; padding-left: 14px; }
  .c3-footer span:nth-child(2) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}