:root {
  color-scheme: light dark;
  --topbar-height: 60px;
  --anchor-offset: 132px;
  --canvas: #f4f0e8;
  --surface: #fcfaf5;
  --surface-subtle: #e9ece4;
  --selection: #dbe9e2;
  --text: #193238;
  --text-muted: #58696b;
  --line: #cfd4cc;
  --action: #1f6870;
  --action-hover: #174f56;
  --on-action: #ffffff;
  --focus: #005fcc;
  --media: #0e1719;
  --shadow: 0 10px 28px rgb(24 45 47 / 10%);
  --radius-control: 8px;
  --radius-surface: 14px;
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-block-start: var(--anchor-offset);
}
body {
  margin: 0;
  background: var(--canvas);
  color: var(--text);
  line-height: 1.55;
}
main {
  display: flex;
  flex-direction: column;
}
button, input, select { font: inherit; }
button, select { color: inherit; }
a { color: inherit; }
img, video { display: block; max-inline-size: 100%; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  z-index: 100;
  inset-block-start: var(--space-3);
  inset-inline-start: var(--space-3);
  transform: translateY(-180%);
  padding: .7rem 1rem;
  border-radius: var(--radius-control);
  background: var(--text);
  color: var(--canvas);
}
.skip-link:focus { transform: none; }

.topbar {
  position: sticky;
  z-index: 30;
  inset-block-start: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-block-size: var(--topbar-height);
  padding: .55rem clamp(1rem, 4vw, 3.5rem);
  border-block-end: 1px solid color-mix(in srgb, var(--line) 85%, transparent);
  background: color-mix(in srgb, var(--canvas) 94%, transparent);
  backdrop-filter: blur(14px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  font-weight: 760;
  text-decoration: none;
}
.brand img {
  inline-size: 40px;
  block-size: 40px;
  object-fit: contain;
  forced-color-adjust: none;
}
.topbar__descriptor {
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 650;
}

.intro {
  order: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(19rem, 26rem);
  gap: var(--space-7);
  align-items: end;
  inline-size: min(1280px, calc(100% - 2rem));
  margin-inline: auto;
  padding-block: clamp(2rem, 5vw, 4.5rem) var(--space-6);
}
.intro__status,
.topic-kicker {
  margin: 0 0 var(--space-2);
  color: var(--text-muted);
  font-size: .86rem;
  font-weight: 700;
}
h1, h2, h3 {
  margin: 0;
  line-height: 1.1;
  letter-spacing: -.025em;
}
h1 {
  max-inline-size: 22ch;
  font-size: clamp(2.1rem, 4vw, 3.7rem);
}
h2 { font-size: clamp(1.75rem, 3vw, 2.7rem); }
.intro__lede {
  max-inline-size: 58ch;
  margin: var(--space-3) 0 0;
  color: var(--text-muted);
  font-size: clamp(1rem, 1.2vw, 1.1rem);
}
.quick-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  max-inline-size: 52rem;
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
}
.quick-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: .1rem .55rem;
  align-items: center;
  min-block-size: 56px;
  padding: .7rem .75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface);
}
.quick-steps li > span {
  grid-row: 1 / -1;
  display: inline-grid;
  place-items: center;
  inline-size: 1.7rem;
  block-size: 1.7rem;
  border-radius: 50%;
  background: var(--selection);
  color: var(--text);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.quick-steps strong { font-size: .86rem; }
.quick-steps small { color: var(--text-muted); font-size: .75rem; line-height: 1.25; }

.extension-guide {
  border-block: 1px solid var(--line);
  background: transparent;
}
.extension-guide summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  align-items: center;
  min-block-size: 72px;
  padding-block: var(--space-3);
  cursor: pointer;
  list-style: none;
}
.extension-guide summary::-webkit-details-marker { display: none; }
.extension-guide summary::after {
  content: "+";
  grid-column: 3;
  font-size: 1.35rem;
  line-height: 1;
}
.extension-guide[open] summary::after { content: "−"; }
.extension-guide img {
  inline-size: 48px;
  block-size: 48px;
  object-fit: contain;
  forced-color-adjust: none;
}
.extension-guide strong,
.extension-guide small { display: block; }
.extension-guide small {
  margin-block-start: .1rem;
  color: var(--text-muted);
  font-size: .85rem;
}
.extension-guide p {
  margin: 0 0 var(--space-4);
  color: var(--text-muted);
  font-size: .92rem;
}

.lesson-map {
  order: 2;
  position: sticky;
  z-index: 20;
  inset-block-start: var(--topbar-height);
  display: flex;
  gap: var(--space-2);
  inline-size: min(1120px, calc(100% - 2rem));
  margin: 0 auto var(--space-5);
  padding-block: .65rem;
  overflow-x: auto;
  scrollbar-width: thin;
  background: color-mix(in srgb, var(--canvas) 94%, transparent);
  backdrop-filter: blur(14px);
}
.lesson-map a {
  display: inline-flex;
  flex: 1 0 auto;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  min-block-size: 42px;
  padding: .55rem .8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface);
  color: var(--text-muted);
  font-size: .86rem;
  font-weight: 720;
  text-decoration: none;
}
.lesson-map a:hover { color: var(--text); border-color: var(--action); }
.lesson-map span,
.topic-kicker span {
  display: inline-grid;
  place-items: center;
  inline-size: 1.55rem;
  block-size: 1.55rem;
  border-radius: 50%;
  background: var(--selection);
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.lesson-map a:first-child span {
  inline-size: auto;
  padding-inline: .35rem;
  border-radius: 4px;
}

.custom-lab {
  order: 4;
  scroll-margin-block-start: var(--anchor-offset);
  inline-size: min(1280px, calc(100% - 2rem));
  margin: 0 auto clamp(2.5rem, 7vw, 6rem);
  padding: clamp(1rem, 2.5vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-surface);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.custom-lab__header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: start;
}
.custom-lab__header h2 { max-inline-size: 22ch; }
.custom-lab__header p:last-child {
  max-inline-size: 68ch;
  margin: var(--space-3) 0 0;
  color: var(--text-muted);
}
.custom-lab__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: flex-end;
}
.upload-button,
.remove-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 48px;
  padding: .65rem 1rem;
  border-radius: var(--radius-control);
  font-weight: 740;
  cursor: pointer;
}
.upload-button {
  border: 1px solid transparent;
  background: var(--action);
  color: var(--on-action);
}
.upload-button:hover { background: var(--action-hover); }
.upload-button input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
.upload-button:focus-within {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}
.remove-button {
  border: 1px solid var(--line);
  background: var(--surface-subtle);
  color: var(--text);
}
.remove-button:hover { background: var(--selection); }
.custom-lab__status {
  margin: var(--space-3) 0 var(--space-4);
  color: var(--text-muted);
  font-size: .9rem;
}
.custom-lab__workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(20rem, .85fr);
  gap: var(--space-5);
  align-items: start;
  min-inline-size: 0;
}
.custom-lab__preview-column {
  position: sticky;
  inset-block-start: 132px;
  min-inline-size: 0;
}
.custom-preview {
  --split: 50%;
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  background: var(--media);
  isolation: isolate;
}
.custom-preview__empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: var(--space-2);
  padding: var(--space-5);
  color: #e7efec;
  text-align: center;
}
.custom-preview__empty img {
  inline-size: 72px;
  block-size: 72px;
  object-fit: contain;
  forced-color-adjust: none;
}
.custom-preview__empty strong { font-size: clamp(1.05rem, 2vw, 1.35rem); }
.custom-preview__empty span {
  max-inline-size: 34ch;
  color: #b8c5c3;
  font-size: .88rem;
}
.custom-preview__image,
.custom-preview__after {
  position: absolute;
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
}
.custom-preview__image {
  object-fit: contain;
  background: var(--media);
}
.custom-preview__after {
  overflow: hidden;
  clip-path: inset(0 calc(100% - var(--split)) 0 0);
  will-change: clip-path;
}
.custom-preview__mascot {
  position: absolute;
  z-index: 8;
  inset-block-start: .65rem;
  inset-inline-start: .65rem;
  inline-size: 48px;
  block-size: 48px;
  object-fit: contain;
  filter: none !important;
  forced-color-adjust: none;
}
.custom-preview[data-empty] .custom-preview__image,
.custom-preview[data-empty] .custom-preview__after,
.custom-preview[data-empty] .custom-preview__mascot { display: none; }
.custom-lab__quick-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: end;
  margin-block-start: var(--space-3);
}
.custom-lab__quick-actions label {
  display: grid;
  gap: .35rem;
  color: var(--text-muted);
  font-size: .82rem;
  font-weight: 700;
}
.custom-lab__quick-actions select {
  inline-size: 100%;
  min-block-size: 44px;
  padding: .55rem .7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface);
}
.custom-controls {
  min-inline-size: 0;
  max-block-size: 42rem;
  margin: 0;
  padding: 0 .25rem 0 0;
  border: 0;
  overflow-y: auto;
  scrollbar-width: thin;
}
.custom-controls:disabled { opacity: .72; }
.custom-control-group {
  border-block-start: 1px solid var(--line);
}
.custom-control-group:last-child { border-block-end: 1px solid var(--line); }
.custom-control-group summary {
  min-block-size: 48px;
  padding-block: .8rem;
  color: var(--text);
  font-weight: 760;
  cursor: pointer;
}
.custom-control-group__body {
  display: grid;
  gap: var(--space-4);
  padding-block: .15rem var(--space-4);
}
.custom-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(4.2rem, auto);
  gap: .45rem .75rem;
  min-inline-size: 0;
  color: var(--text-muted);
  font-size: .82rem;
}
.custom-control > span { min-inline-size: 0; }
.custom-control strong {
  display: block;
  color: var(--text);
  font-size: .88rem;
}
.custom-control small {
  display: block;
  margin-block-start: .08rem;
  line-height: 1.25;
}
.custom-control output {
  align-self: start;
  min-inline-size: 4.2rem;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  font-weight: 720;
  text-align: end;
}
.custom-control input[type="range"] {
  grid-column: 1 / -1;
  inline-size: 100%;
  block-size: 40px;
  margin: 0;
  accent-color: var(--action);
}

.tutorial-workspace {
  order: 3;
  inline-size: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
  padding-block: 0 var(--space-7);
}
.topic-stage {
  display: grid;
  gap: clamp(2.5rem, 7vw, 6rem);
  min-inline-size: 0;
}

.topic-panel {
  scroll-margin-block-start: var(--anchor-offset);
  min-inline-size: 0;
  padding: clamp(1rem, 2.5vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-surface);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.reveal[data-reveal-state="waiting"] {
  opacity: 0;
  transform: translateY(28px);
}
.reveal[data-reveal-state="visible"] {
  opacity: 1;
  transform: none;
  transition: opacity 560ms ease, transform 560ms cubic-bezier(.2, .8, .2, 1);
}
.topic-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: start;
  margin-block-end: var(--space-4);
}
.topic-header h2 { max-inline-size: 20ch; }
.topic-header p:last-child {
  max-inline-size: 64ch;
  margin: var(--space-3) 0 0;
  color: var(--text-muted);
}
.try-line {
  margin: -.25rem 0 var(--space-4);
  padding: .65rem .8rem;
  border-inline-start: 3px solid var(--action);
  background: color-mix(in srgb, var(--selection) 58%, transparent);
  color: var(--text-muted);
  font-size: .9rem;
}
.try-line strong { color: var(--text); }

.preset-button,
.reset-button {
  min-block-size: 48px;
  border-radius: var(--radius-control);
  font-weight: 740;
  cursor: pointer;
}
.preset-button {
  padding: .65rem 1rem;
  border: 1px solid transparent;
  background: var(--action);
  color: var(--on-action);
}
.preset-button:hover { background: var(--action-hover); }
.preset-button[aria-pressed="true"] {
  border-color: var(--line);
  background: var(--selection);
  color: var(--text);
}
.reset-button {
  padding: .6rem .85rem;
  border: 1px solid var(--line);
  background: var(--surface-subtle);
  color: var(--text);
}
.reset-button:hover { background: var(--selection); }
.reset-button {
  align-self: end;
  min-inline-size: 7.5rem;
}

.demo { min-inline-size: 0; }
.compare {
  --split: 50%;
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  background: var(--media);
  isolation: isolate;
}
.compare__video,
.compare__after {
  position: absolute;
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
}
.compare__video {
  object-fit: contain;
  background: var(--media);
}
.compare__video--before { filter: none; }
.compare__after {
  overflow: hidden;
  clip-path: inset(0 calc(100% - var(--split)) 0 0);
  will-change: clip-path;
}
.demo[data-neutral] .compare__after { visibility: hidden; }
.compare__video--after { filter: var(--after-filter); }
.demo[data-demo="youtube"] { --effect-filter: url("#youtube-filter"); }
.demo[data-demo="white-balance"] { --effect-filter: url("#white-balance-filter"); }
.demo[data-demo="highlights"] { --effect-filter: url("#highlights-filter"); }
.demo[data-demo="anime"] { --effect-filter: url("#anime-filter"); }

.compare__label {
  position: absolute;
  z-index: 4;
  inset-block-start: .65rem;
  padding: .3rem .5rem;
  border-radius: 4px;
  background: rgb(12 21 23 / 76%);
  color: #fff;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
}
.compare__label--before { inset-inline-end: .65rem; }
.compare__label--after { inset-inline-start: .65rem; }
.compare__divider {
  position: absolute;
  z-index: 6;
  inset: 0;
  pointer-events: none;
}
.compare__divider::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: var(--split);
  inline-size: 2px;
  transform: translateX(-1px);
  background: rgb(255 255 255 / 90%);
  box-shadow: 0 0 0 1px rgb(0 0 0 / 18%);
}
.compare__divider input {
  position: absolute;
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
  margin: 0;
  opacity: 0;
  cursor: ew-resize;
  pointer-events: auto;
}
.compare__handle {
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: var(--split);
  display: grid;
  place-items: center;
  inline-size: 46px;
  block-size: 46px;
  transform: translate(-50%, -50%);
  border: 2px solid white;
  border-radius: 50%;
  background: rgb(18 34 37 / 88%);
  color: white;
  font-size: 1.1rem;
  font-weight: 850;
  box-shadow: 0 6px 22px rgb(0 0 0 / 28%);
}
.compare__divider input:focus-visible + .compare__handle {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(8rem, 1fr)) auto;
  gap: var(--space-3);
  align-items: end;
  margin-block-start: var(--space-4);
}
.controls--two { grid-template-columns: repeat(2, minmax(8rem, 1fr)) auto; }
.controls label {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .35rem .7rem;
  min-inline-size: 0;
  color: var(--text-muted);
  font-size: .83rem;
  font-weight: 700;
}
.controls label > span { min-inline-size: 0; }
.controls label small {
  display: block;
  margin-block-start: .08rem;
  color: var(--text-muted);
  font-size: .72rem;
  font-weight: 520;
  line-height: 1.2;
}
.controls output {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.controls input[type="range"] {
  grid-column: 1 / -1;
  inline-size: 100%;
  block-size: 40px;
  margin: 0;
  accent-color: var(--action);
}
.range--temperature { accent-color: #a05a35 !important; }
.range--tint { accent-color: #875477 !important; }

.example-help {
  margin-block-start: var(--space-4);
  border-block-start: 1px solid var(--line);
  color: var(--text-muted);
  font-size: .9rem;
}
.example-help summary {
  padding-block: .75rem .25rem;
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
}
.example-help p { margin: var(--space-2) 0 0; }
.finish {
  order: 5;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-4);
  align-items: center;
  inline-size: min(1080px, calc(100% - 2rem));
  margin: 0 auto var(--space-7);
  padding-block: var(--space-5);
  border-block: 1px solid var(--line);
}
.finish img {
  inline-size: 64px;
  block-size: 64px;
  object-fit: contain;
  forced-color-adjust: none;
}
.finish h2 { font-size: clamp(1.45rem, 2.3vw, 2.2rem); }
.finish p {
  max-inline-size: 52rem;
  margin: .45rem 0 0;
  color: var(--text-muted);
}
.finish > a {
  color: var(--action);
  font-weight: 740;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6) clamp(1rem, 4vw, 3.5rem);
  border-block-start: 1px solid var(--line);
  color: var(--text-muted);
  font-size: .88rem;
}
footer nav {
  display: flex;
  gap: var(--space-5);
}
footer a {
  color: var(--text-muted);
  font-weight: 650;
  text-decoration: none;
}
footer a:hover { color: var(--action); }

.filter-bank { position: absolute; pointer-events: none; }
.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
.topic-panel:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

@media (max-width: 1040px) {
  .intro { grid-template-columns: minmax(0, 1fr) minmax(17rem, 22rem); }
  .controls,
  .controls--two { grid-template-columns: repeat(2, minmax(8rem, 1fr)); }
  .reset-button { inline-size: 100%; }
}

@media (max-width: 920px) {
  .intro {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding-block: var(--space-6) var(--space-4);
  }
  .lesson-map { inset-block-start: var(--topbar-height); }
  .topic-panel,
  .custom-lab { scroll-margin-block-start: var(--anchor-offset); }
  .custom-lab__workspace { grid-template-columns: 1fr; }
  .custom-lab__preview-column {
    position: static;
    inset-block-start: auto;
  }
  .custom-controls {
    max-block-size: none;
    padding-inline-end: 0;
    overflow: visible;
  }
}

@media (max-width: 620px) {
  :root {
    --topbar-height: 56px;
    --anchor-offset: 68px;
  }
  .topbar { min-block-size: var(--topbar-height); }
  .brand img { inline-size: 36px; block-size: 36px; }
  .brand span { font-size: .9rem; }
  .topbar__descriptor { display: none; }
  .intro,
  .tutorial-workspace,
  .custom-lab,
  .finish,
  .lesson-map { inline-size: min(100% - 1.5rem, 38rem); }
  .intro { padding-block-start: var(--space-5); }
  h1 { font-size: clamp(2rem, 9vw, 2.8rem); }
  .quick-steps { grid-template-columns: 1fr; gap: var(--space-2); }
  .extension-guide summary { min-block-size: 64px; }
  .topic-panel {
    padding: var(--space-4);
    border-radius: 10px;
  }
  .custom-lab {
    padding: var(--space-4);
    border-radius: 10px;
  }
  .topic-stage { gap: var(--space-6); }
  .lesson-map {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-block-end: var(--space-4);
    overflow: visible;
    background: transparent;
    backdrop-filter: none;
  }
  .lesson-map a {
    flex: none;
    min-inline-size: 0;
    min-width: 0;
    padding-inline: .7rem;
    white-space: normal;
    text-align: center;
  }
  .topic-panel,
  .custom-lab { scroll-margin-block-start: var(--anchor-offset); }
  .topic-header {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .custom-lab__header {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .custom-lab__actions {
    display: grid;
    grid-template-columns: 1fr;
    justify-content: stretch;
  }
  .upload-button,
  .remove-button { inline-size: 100%; }
  .custom-lab__quick-actions { grid-template-columns: 1fr; }
  h1 { max-inline-size: 15ch; }
  .topic-header h2 { font-size: clamp(1.65rem, 7vw, 2.15rem); }
  .preset-button { inline-size: 100%; }
  .controls,
  .controls--two { grid-template-columns: 1fr; }
  .compare__handle { inline-size: 42px; block-size: 42px; }
  .finish { grid-template-columns: auto minmax(0, 1fr); }
  .finish > a { grid-column: 1 / -1; }
  footer { flex-direction: column; }
  footer nav { flex-wrap: wrap; gap: var(--space-4); }
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #101719;
    --surface: #182225;
    --surface-subtle: #222e31;
    --selection: #29413f;
    --text: #edf1eb;
    --text-muted: #a9b7b4;
    --line: #3a4849;
    --action: #79c6c1;
    --action-hover: #9ad8d3;
    --on-action: #102326;
    --focus: #8fc0ff;
    --shadow: 0 16px 38px rgb(0 0 0 / 24%);
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
  .reveal[data-reveal-state] {
    opacity: 1;
    transform: none;
  }
}

@media (forced-colors: active) {
  :root {
    color-scheme: light;
    --canvas: Canvas;
    --surface: Canvas;
    --surface-subtle: Canvas;
    --selection: Highlight;
    --text: CanvasText;
    --text-muted: CanvasText;
    --line: CanvasText;
    --action: ButtonText;
    --action-hover: HighlightText;
    --on-action: ButtonFace;
    --focus: Highlight;
    --media: CanvasText;
  }
  .topbar,
  .lesson-map,
  .quick-steps li,
  .custom-lab,
  .topic-panel {
    background: Canvas;
    border-color: CanvasText;
    backdrop-filter: none;
  }
  button,
  select,
  .upload-button,
  .remove-button,
  .preset-button,
  .reset-button,
  .lesson-map a {
    background: ButtonFace;
    color: ButtonText;
    border-color: ButtonText;
  }
  .brand img,
  .extension-guide img,
  .custom-preview__empty img,
  .custom-preview__mascot,
  .finish img {
    forced-color-adjust: none;
  }
}

@media print {
  .topbar,
  .intro,
  .lesson-map,
  .finish,
  footer { display: none !important; }
  .tutorial-workspace { display: block; inline-size: 100%; padding: 0; }
  .topic-panel { margin-block-end: 2rem; border: 0; box-shadow: none; }
}