@layer page {
/* ============================================================
   COLOR / CONVERSION
   Page-scoped helpers for /color/conversion.
   Three families:
     .conv-strip          - palette strip (one row of swatches)
     .conv-mosaic         - asymmetric tile grid
     .conv-related        - related-link cards at the bottom
   ============================================================ */

.conv-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  height: 64px;
  border-radius: var(--radius-md);
  overflow: hidden;

  > span {
    display: block;
    transition: transform var(--duration-fast) var(--ease-out-expo);

    &:hover { transform: scaleY(1.06); z-index: 1; position: relative; }
  }
}


.conv-mosaic {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-auto-rows: minmax(56px, 1fr);
  gap: 4px;
  width: 100%;
  aspect-ratio: 1.4;
}
.conv-mosaic-cell {
  border-radius: 4px;
  transition: transform var(--duration-normal) var(--ease-out-expo);

  &:hover { transform: scale(1.05); z-index: 1; }
  &.conv-mosaic-cell--wide { grid-column: span 2; }
  &.conv-mosaic-cell--tall { grid-row: span 2; }
}


.conv-related {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-6);
  background: var(--surface-1);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: transform var(--duration-fast);

  &:hover { transform: translateY(-2px); }

  h3 { color: var(--text-0); }
  p { color: var(--text-2); }
}
.conv-related__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: oklch(0.80 0.18 var(--tag-hue, var(--hue-brand)));
  align-self: flex-start;
}


/* ─────────────────────────────────────────────────────────────
   Harmony wheel: conic gradient ring with anchor dots placed by
   --rot. Used on /color/harmonies.
   ───────────────────────────────────────────────────────────── */
.harmony-wheel {
  width: clamp(280px, 100%, 480px);
  aspect-ratio: 1;
  position: relative;
  margin: 0 auto;
}
.harmony-wheel__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    oklch(0.72 0.22 0),    oklch(0.78 0.20 30),  oklch(0.82 0.18 60),
    oklch(0.86 0.16 90),   oklch(0.82 0.20 120), oklch(0.78 0.22 150),
    oklch(0.72 0.20 180),  oklch(0.66 0.20 210), oklch(0.62 0.22 240),
    oklch(0.60 0.24 270),  oklch(0.62 0.22 300), oklch(0.68 0.22 330),
    oklch(0.72 0.22 360)
  );
  mask-image: radial-gradient(circle, transparent 56%, black 58%, black 86%, transparent 88%);
  -webkit-mask-image: radial-gradient(circle, transparent 56%, black 58%, black 86%, transparent 88%);
  animation: harmony-wheel-spin 40s linear infinite;
}
@keyframes harmony-wheel-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.harmony-wheel__dots {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}
.harmony-wheel__dot {
  position: absolute;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  transform: rotate(var(--rot, 0deg)) translateY(-38%) rotate(calc(var(--rot, 0deg) * -1));
  box-shadow: 0 0 16px oklch(from var(--accent) l c h / 0.25);
}
.harmony-wheel__center {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--text-2);
  pointer-events: none;
}


/* ─────────────────────────────────────────────────────────────
   Contrast bars: two inline rows on a colored field showing a
   sample text and its score. Used on /color/contrast.
   ───────────────────────────────────────────────────────────── */
.contrast-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
}
.contrast-bar__sample {
  font-size: var(--text-base);
  font-weight: 500;
}
.contrast-bar__score {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
}


/* ─────────────────────────────────────────────────────────────
   Naming row: chip + name + hex columns. Used on /color/naming.
   ───────────────────────────────────────────────────────────── */
.naming-row {
  display: grid;
  grid-template-columns: 32px 1fr max-content;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--surface-1);
  border-radius: var(--radius-md);
}
.naming-row__chip {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}
.naming-row__name {
  font-size: var(--text-sm);
  color: var(--text-0);
}
.naming-row__hex {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-2);
}
}
@layer page {
/* ============================================================
   COLOR FEATURE GROUPS
   Six-step directory and restrained group landings for /color.
   Focused feature pages keep their richer treatment elsewhere.
   ============================================================ */

.cg-map {
  max-width: 80rem;
  margin-inline: auto;
  padding: var(--space-16) var(--gutter) var(--space-24);
}

.cg-map-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

.cg-features {
  max-width: 80rem;
  margin-inline: auto;
}

/* Each block takes four fifths of the container and gives the fifth back on
   the side the copy is not on: text on the left leaves the gap on the right,
   and the reversed block mirrors both at once. The blocks alternate down the
   page, so the empty fifth swings side to side and the column of headings
   stops running dead straight.

   Above the breakpoint only. Once the split stacks there is one column and
   no side to alternate, so the width goes back to full. */
@media (width > 768px) {
  .cg-feature {
    width: 80%;
    margin-inline: 0 auto;
  }

  .cg-feature.reverse {
    margin-inline: auto 0;
  }
}

.cg-feature {
  h2 {
    max-width: 16ch;
    margin-block: 0 var(--space-5);
    color: var(--text-0);
    font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
    font-weight: var(--weight-light);
    line-height: 1.06;
    letter-spacing: -0.025em;
    text-wrap: balance;
  }

  .eyebrow {
    margin-block-end: var(--space-4);
    color: var(--accent-text);
  }
}

.cg-feature-copy {
  min-width: 0;

  .body {
    max-width: 52ch;
    color: var(--text-1);
    text-wrap: pretty;
  }
}

.cg-feature-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-block-start: var(--space-6);
  color: var(--accent-text);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  text-decoration: none;

  span { transition: transform var(--duration-fast) var(--ease-out-expo); }

  &:hover span { transform: translateX(var(--space-1)); }

  &:focus-visible {
    outline: 2px solid var(--accent-text);
    outline-offset: var(--space-1);
    border-radius: var(--radius-sm);
  }
}

.cg-feature-visual {
  min-width: 0;

  .code-block { margin: 0; }
}

@media (width <= 960px) {
  .cg-map-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (width <= 600px) {
  .cg-map { padding-block: var(--space-12) var(--space-16); }
  .cg-map-grid { grid-template-columns: 1fr; }
  .cg-feature { padding-block: var(--space-16); }
}
}
@layer page {
/* ============================================================
   COLOR SPACE (show page)
   Single-space page: big lettermark hero + per-space channel
   ribbon. No cards, no tinted bands -- type, glow, and the
   space's identity carried by its channel set.
   ============================================================ */


/* ── HERO ─────────────────────────────────────────────────── */

.space-hero {
  --space-hue: 260;
  position: relative;
  padding: calc(var(--nav-h) + clamp(5rem, 11vh, 9rem)) var(--gutter) clamp(6rem, 12vh, 10rem);
  overflow: hidden;
  text-align: center;

  /* Ambient triple-glow driven by the per-space hue. */
  &::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse 90% 65% at 50% 30%,
        oklch(0.22 0.14 var(--space-hue) / 0.55) 0%, transparent 65%),
      radial-gradient(ellipse 40% 40% at 20% 70%,
        oklch(0.18 0.16 calc(var(--space-hue) +  60) / 0.28) 0%, transparent 55%),
      radial-gradient(ellipse 40% 40% at 80% 70%,
        oklch(0.18 0.16 calc(var(--space-hue) -  60) / 0.28) 0%, transparent 55%);
    pointer-events: none;
  }
}

.subnav + .space-hero {
  padding-block-start: var(--space-10);
}

.space-hero-inner {
  position: relative;
  max-width: 72rem;
  margin-inline: auto;
}

/* Big lettermark. Background-clipped rainbow, subtle idle shimmer. */
.space-hero-title {
  font-size: clamp(4.5rem, 13vw, 11rem);
  font-weight: 100;
  line-height: 0.9;
  letter-spacing: -0.05em;
  margin: 0 0 clamp(2rem, 4vh, 3.5rem);
  /* Allow line-height < 1 without clipping descenders. */
  padding-block: 0.1em;
}

.space-hero-title-text {
  background: linear-gradient(95deg in oklch longer hue,
    oklch(0.78 0.24   0),
    oklch(0.82 0.22  55),
    oklch(0.86 0.22  90),
    oklch(0.82 0.24 145),
    oklch(0.78 0.22 200),
    oklch(0.78 0.26 260),
    oklch(0.78 0.28 320),
    oklch(0.78 0.24 360));
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: space-title-shimmer 18s linear infinite;
}

@keyframes space-title-shimmer {
  from { background-position:    0% 0; }
  to   { background-position: -220% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .space-hero-title-text { animation: none; }
}

.space-hero-tagline {
  font-family: var(--font-body);
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  font-weight: 200;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--text-0);
  max-width: 38rem;
  margin: 0 auto var(--space-4);
  text-wrap: balance;
}

.space-hero-differentiator {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent-text);
  max-width: 36rem;
  margin: 0 auto var(--space-4);
  text-wrap: balance;
}

.space-hero-description {
  font-size: var(--text-base);
  font-weight: 300;
  color: var(--text-2);
  max-width: 44rem;
  margin: 0 auto clamp(2.5rem, 5vh, 4rem);
  text-wrap: pretty;
  line-height: 1.75;
}

/* Decorative spectrum strip, same rhythm the tools index uses. */
.space-hero-spectrum {
  display: flex;
  gap: 2px;
  height: 3px;
  width: min(60%, 22rem);
  margin: 0 auto clamp(3rem, 6vh, 4.5rem);
  opacity: 0.9;

  span { flex: 1; border-radius: 2px; }
}


/* ── Channels ribbon ──────────────────────────────────────── */

.space-hero-channels {
  list-style: none;
  padding: 0;
  margin: 0;

  li {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    min-width: 110px;
  }
}

.space-channel-symbol {
  font-family: var(--font-body);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 100;
  line-height: 1;
  letter-spacing: -0.03em;
  color: oklch(0.85 0.18 var(--space-hue));
}

.space-channel-name {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-0);
}

.space-channel-range {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--text-3);
  text-transform: uppercase;
}

.space-story-channels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(calc(var(--space-24) * 1.25), 1fr));
  gap: var(--space-4);

  > div {
    display: grid;
    justify-items: center;
    gap: var(--space-2);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    background: var(--surface-1);
  }

  strong {
    color: var(--accent-text);
    font-size: var(--text-3xl);
    font-weight: 500;
  }

  span {
    color: var(--text-0);
  }

  code {
    color: var(--text-2);
  }
}

.space-story-related {
  margin-block-start: var(--space-12);
}


/* ── Other spaces navigator ──────────────────────────────── */

.space-other-spaces {
  max-width: 80rem;
  margin-inline: auto;
  padding: clamp(3rem, 8vh, 7rem) var(--gutter) clamp(4rem, 10vh, 8rem);
  text-align: center;

  .eyebrow { margin-bottom: var(--space-4); }
  h2 { margin-bottom: clamp(2rem, 4vh, 3rem); }
}

.space-other-spaces-list {
  max-width: 60rem;
  margin-inline: auto;
}

.space-other-space {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  color: var(--text-2);
  background: transparent;
  border: 1px solid var(--border-subtle);
  transition:
    color var(--duration-fast),
    border-color var(--duration-fast);

  &:hover {
    color: var(--text-0);
    border-color: var(--border-default);
  }
}

/* ── Primaries reference grid ─────────────────────────────────
   Eight reference colors (RGB primaries + CMY secondaries +
   black + white) shown with their notation in the space's
   native syntax. */
.space-primaries {
  max-width: 80rem;
  margin: 0 auto;
  padding: clamp(3rem, 6vh, 6rem) var(--gutter);
}
.space-primaries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: var(--space-4);
}
.space-primary {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--surface-1);
  border-radius: var(--radius-lg);
}
.space-primary-swatch {
  height: 3rem;
  border-radius: var(--radius-sm);
}
.space-primary-name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-0);
  margin: 0;
}
.space-primary-notation {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--text-2);
  word-break: break-all;
  line-height: 1.45;
}

/* ── Channel walks ────────────────────────────────────────────
   One strip per channel, walking that channel from min to max
   while the other two are pinned. Stacks vertically. */
.space-walks {
  max-width: 80rem;
  margin: 0 auto;
  padding: clamp(2rem, 4vh, 4rem) var(--gutter) clamp(4rem, 6vh, 6rem);
}
.space-walks-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.space-walk {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.space-walk-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}
.space-walk-symbol {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-0);
  min-width: 1.5em;
}
.space-walk-name {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-2);
}
.space-walk-strip {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  height: 3.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* ── Index-page split visuals ───────────────────────────────
   Each landing-split block on /color/spaces uses one of these
   compact visuals on its visual side. Reuses the .landing-*
   primitives for the layout chrome. */

/* Split 2 visual: two lightness ramps in different spaces. */
.space-compare-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.space-compare-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.space-compare-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
}
.space-compare-strip {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  height: 3rem;
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* Split 3 visual: three saturated swatches in different gamuts. */
.space-gamut-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.space-gamut-row {
  display: grid;
  grid-template-columns: 6rem 1fr auto;
  align-items: center;
  gap: var(--space-4);
}
.space-gamut-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-1);
}
.space-gamut-swatch {
  height: 2.5rem;
  border-radius: var(--radius-md);
}
.space-gamut-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
  white-space: nowrap;
}

/* Split 4 visual: a small flow diagram showing XYZ as the hub. */
.space-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-4);
  flex-wrap: wrap;
}
.space-flow-node {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  background: var(--surface-1);
  color: var(--text-1);

  &.space-flow-node--hub {
    background: oklch(from var(--accent) l c h / 0.18);
    color: var(--accent-text);
    font-weight: 600;
  }
}
.space-flow-arrow {
  font-family: var(--font-mono);
  color: var(--text-3);
}
}
@layer page {
/* ============================================================
   COLOR TOPICS
   Shared editorial structure for /color/* capability landings.
   ============================================================ */

.ct-section {
  padding-block: var(--space-24);

  > * { min-width: 0; }

  .eyebrow { margin-block-end: var(--space-4); }

  h2 {
    max-width: 15ch;
    margin-block: 0 var(--space-6);
    font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
    font-weight: var(--weight-light);
    line-height: 1.08;
    letter-spacing: -0.025em;
    text-wrap: balance;
  }

  .body,
  .body-lg {
    max-width: 58ch;
    text-wrap: pretty;
  }
}

.ct-visual {
  position: relative;
  padding: var(--space-8);
  background: var(--surface-1);
  border-radius: var(--radius-xl);

  &::before {
    content: '';
    position: absolute;
    inset: calc(var(--space-12) * -1);
    z-index: -1;
    background: radial-gradient(circle, var(--accent-glow), transparent 68%);
    opacity: 0.45;
    pointer-events: none;
  }

  > :first-child { margin-block-start: 0; }
  > :last-child { margin-block-end: 0; }
}

.ct-section-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
  margin-block-start: var(--space-6);
}

.ct-context-link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  color: var(--text-0);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  text-decoration-color: var(--accent-border);
  text-underline-offset: 0.25em;
  transition: color var(--duration-fast), text-decoration-color var(--duration-fast);

  &::after {
    content: '\2192';
    color: var(--accent-text);
    transition: transform var(--duration-fast) var(--ease-out-expo);
  }

  &:hover {
    color: var(--accent-text);
    text-decoration-color: var(--accent-text);

    &::after { transform: translateX(var(--space-1)); }
  }

  &:focus-visible {
    outline: 2px solid var(--accent-text);
    outline-offset: var(--space-1);
    border-radius: var(--radius-sm);
  }
}

.ct-link-type {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-regular);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ct-format-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.ct-format-chip {
  padding: var(--space-2) var(--space-3);
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.ct-palette-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  min-height: var(--space-16);
  overflow: hidden;
  border-radius: var(--radius-md);

  > span { min-width: 0; }
}

.ct-gradient-stack {
  display: grid;
  gap: var(--space-4);

  > div {
    min-height: var(--space-16);
    border-radius: var(--radius-md);
  }
}

.ct-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.ct-stat {
  padding: var(--space-5);
  background: var(--surface-2);
  border-radius: var(--radius-md);

  strong {
    display: block;
    margin-block-end: var(--space-2);
    color: var(--text-0);
    font-size: var(--text-xl);
    font-weight: var(--weight-medium);
  }

  span {
    color: var(--text-2);
    font-size: var(--text-sm);
  }
}

.ct-flow {
  display: grid;
  gap: var(--space-3);
}

.ct-flow-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--surface-2);
  border-radius: var(--radius-md);

  code {
    overflow: hidden;
    color: var(--text-0);
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}

.ct-swatch {
  width: var(--space-10);
  aspect-ratio: 1;
  background: var(--sample);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.ct-result {
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  white-space: nowrap;
}

.ct-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  white-space: nowrap;

  &::before {
    content: '';
    width: var(--space-2);
    aspect-ratio: 1;
    background: var(--status-color, var(--accent-text));
    border-radius: 50%;
  }
}

.ct-status.rejected { --status-color: var(--text-3); }

.ct-object-proof {
  display: grid;
  gap: var(--space-5);
}

.ct-object-color {
  min-height: var(--space-24);
  background: var(--sample);
  border-radius: var(--radius-lg);
}

.ct-object-data {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);

  div {
    padding: var(--space-4);
    background: var(--surface-2);
    border-radius: var(--radius-md);
  }

  dt {
    margin-block-end: var(--space-2);
    color: var(--text-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }

  dd {
    margin: 0;
    color: var(--text-0);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
  }
}

.ct-preview-repair,
.ct-preview-contrast {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-3);

  > span {
    color: var(--text-3);
    font-family: var(--font-mono);
  }
}

.ct-preview-contrast {
  > div {
    display: grid;
    gap: var(--space-2);
    padding: var(--space-4);
    background: var(--repair-background);
    border-radius: var(--radius-md);
    color: var(--repair-foreground);
  }

  span { font-size: var(--text-xs); }
  strong { font-size: var(--text-lg); }
}

.ct-preview-vision {
  display: grid;
  gap: var(--space-3);
}

.ct-repair-proof__intro,
.ct-vision-proof__intro {
  max-width: var(--layout-guide-measure);
  margin-block-start: var(--space-10);
}

.ct-repair-proof,
.ct-vision-proof { padding-block-start: var(--space-10); }

.ct-repair-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  gap: var(--space-6);

  &:has(.ct-repair-comparison__arrow) {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
  }
}

.ct-repair-state,
.ct-repair-sample {
  margin: 0;
  padding: var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
}

.ct-repair-state {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: var(--space-5);

  figcaption {
    display: grid;
    gap: var(--space-2);
  }

  strong {
    color: var(--text-0);
    font-size: var(--text-xl);
  }

  figcaption span {
    color: var(--text-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }
}

.ct-repair-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  min-height: var(--space-24);
  overflow: hidden;
  border-radius: var(--radius-md);

  > span {
    display: flex;
    align-items: end;
    min-width: 0;
    padding: var(--space-3);
  }

  code {
    padding: var(--space-1) var(--space-2);
    background: color-mix(in oklch, var(--surface-0) 78%, transparent);
    border-radius: var(--radius-sm);
    color: var(--text-0);
    font-size: var(--text-xs);
    line-height: 1.4;
  }
}

.ct-repair-geometry {
  width: min(100%, calc(var(--space-32) * 2));
  margin: auto;
  color: var(--text-3);
}

.ct-repair-geometry__ring {
  stroke-width: 1;
  stroke-dasharray: 2 5;
}

.ct-repair-geometry__shape {
  stroke: var(--accent-text);
  stroke-width: 2;
}

.ct-repair-sample {
  display: grid;
  align-content: space-between;
  gap: var(--space-8);
  min-height: calc(var(--space-32) * 2);
  background: var(--repair-background);
  color: var(--repair-foreground);
}

.ct-repair-sample__state {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ct-repair-sample__text {
  max-width: 22ch;
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: var(--weight-medium);
  line-height: 1.2;
}

.ct-repair-sample__result {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-4);

  code,
  strong,
  span { color: inherit; }

  span {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    text-transform: uppercase;
  }
}

.ct-repair-comparison__arrow {
  color: var(--accent-text);
  font-size: var(--text-2xl);
}

.ct-repair-proof__note {
  margin-block: var(--space-5) 0;
  color: var(--text-3);
  font-size: var(--text-sm);
}

.ct-repair-pipeline {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: repair-step;

  li {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--surface-2);
    border-radius: var(--radius-md);
    counter-increment: repair-step;
  }

  li::before {
    content: counter(repair-step);
    color: var(--accent-text);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }

  code {
    color: var(--text-2);
    font-size: var(--text-xs);
  }
}

.ct-repair-boundaries {
  display: grid;
  gap: var(--space-4);

  article,
  > p {
    margin: 0;
    padding: var(--space-5);
    background: var(--surface-2);
    border-radius: var(--radius-md);
  }

  h3 {
    margin-block: 0 var(--space-2);
    color: var(--text-0);
    font-size: var(--text-lg);
  }

  p {
    margin: 0;
    color: var(--text-2);
  }
}

.ct-vision-matrix-wrap {
  overflow-x: auto;
  margin-inline: calc(var(--space-8) * -1);
  padding-inline: var(--space-8);
}

.ct-vision-matrix {
  width: 100%;
  min-width: var(--layout-guide-measure);
  border-collapse: separate;
  border-spacing: var(--space-2);

  caption {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  th {
    padding: var(--space-2);
    color: var(--text-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: var(--weight-regular);
    text-align: left;
  }

  tbody th { color: var(--text-1); }

  td {
    padding: 0;
    background: var(--surface-1);
    border-radius: var(--radius-md);
  }
}

.ct-vision-cell {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2) var(--space-3);
  min-width: var(--space-32);
  padding: var(--space-3);
}

.ct-vision-cell__marker {
  display: grid;
  grid-row: span 2;
  place-items: center;
  width: var(--space-8);
  aspect-ratio: 1;
  background: var(--vision-color);
  border-radius: var(--radius-sm);
  color: var(--surface-0);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
}

.ct-vision-cell__swatch { display: none; }

.ct-vision-cell__label {
  color: var(--text-1);
  font-size: var(--text-sm);
}

.ct-vision-cell code {
  color: var(--text-3);
  font-size: var(--text-xs);
}

.ct-vision-limits {
  margin: 0;
  padding-inline-start: var(--space-5);
  color: var(--text-2);
}

.ct-primary-proof {
  padding-block: var(--space-10) var(--space-24);
}

.ct-primary-proof__visual {
  min-width: 0;
}

.ct-primary-proof__caption {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
  max-width: var(--layout-guide-measure);
  margin-block-start: var(--space-6);

  h2 {
    max-width: 24ch;
    margin: 0;
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    line-height: 1.2;
    text-wrap: balance;
  }

  .body {
    max-width: var(--layout-guide-measure);
    margin: 0;
  }
}

.ct-operation-proof {
  min-width: 0;
  padding: var(--space-6);
  background: var(--surface-1);
  border-radius: var(--radius-xl);
}

.ct-operation-proof__states {
  display: grid;
  grid-template-columns: repeat(3, minmax(var(--space-32), 1fr));
  overflow-x: auto;
  border-radius: var(--radius-lg);
}

.ct-operation-proof__state {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: calc(var(--space-32) * 2);
  padding: var(--space-4);
  background: var(--proof-color);

  > span,
  > strong,
  > code {
    align-self: flex-start;
    padding: var(--space-1) var(--space-2);
    background: color-mix(in oklch, var(--surface-0) 78%, transparent);
    border-radius: var(--radius-sm);
    color: var(--text-0);
  }

  > span,
  > code {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }

  > strong {
    font-size: var(--text-sm);
  }
}

.ct-operation-proof__measure {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin: var(--space-4) 0 0;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-align: center;

  span:first-child { text-align: start; }
  span:last-child { text-align: end; }
}

.ct-operation-proof--hue {
  display: grid;
  grid-template-columns: minmax(0, 0.6fr) minmax(0, 1.4fr);
  gap: var(--space-8);
  align-items: center;
}

.ct-operation-proof__wheel {
  width: 100%;
  max-width: calc(var(--space-32) * 2);
  margin-inline: auto;
}

.ct-operation-proof__ring {
  color: var(--border-default);
  stroke-dasharray: var(--space-1) var(--space-2);
}

.ct-operation-proof__arc {
  color: var(--accent-text);
  stroke-width: var(--space-1);
}

.ct-operation-proof__swatch {
  display: flex;
  align-items: end;
  min-width: var(--space-24);
  min-height: var(--space-24);
  padding: var(--space-3);
  background: var(--sample);

  code {
    padding: var(--space-1) var(--space-2);
    background: color-mix(in oklch, var(--surface-0) 78%, transparent);
    border-radius: var(--radius-sm);
    color: var(--text-0);
    font-size: var(--text-xs);
  }
}

.ct-mix-proof {
  display: grid;
  gap: var(--space-4);
}

.ct-mix-proof__row {
  display: grid;
  grid-template-columns: var(--space-32) minmax(0, 1fr) var(--space-32);
  gap: var(--space-4);
  align-items: center;

  > strong,
  > code {
    color: var(--text-2);
    font-size: var(--text-sm);
  }
}

.ct-mix-proof__path {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  min-width: 0;
  overflow-x: auto;
  border-radius: var(--radius-lg);
}

.ct-mix-proof__ratio,
.ct-mix-proof__arrow {
  padding: var(--space-3);
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.ct-endpoint-proof__scale {
  display: grid;
  grid-template-columns: repeat(5, minmax(var(--space-24), 1fr));
  overflow-x: auto;
  border-radius: var(--radius-lg);
}

.ct-endpoint-proof__labels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-block-start: var(--space-4);
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-align: center;

  span:first-child { text-align: start; }
  span:last-child { text-align: end; }
}

.ct-context-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  min-width: 0;
  padding: var(--space-6);
  background: var(--surface-1);
  border-radius: var(--radius-xl);
}

.ct-context-proof__expression,
.ct-context-proof__context,
.ct-context-proof__result {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  justify-content: center;
  min-width: 0;
  min-height: calc(var(--space-32) * 2);
  padding: var(--space-5);
  background: var(--surface-2);
  border-radius: var(--radius-lg);

  > span {
    color: var(--text-2);
    font-size: var(--text-xs);
    text-transform: uppercase;
  }

  > code {
    overflow-wrap: anywhere;
    color: var(--text-0);
    font-size: var(--text-sm);
  }
}

.ct-context-proof__context {
  margin: 0;

  dl {
    display: grid;
    gap: var(--space-2);
    margin: 0;
  }

  dl > div,
  & > div {
    display: flex;
    gap: var(--space-3);
    justify-content: space-between;
  }

  dt { color: var(--text-2); }
  dd { margin: 0; }

  dd span {
    display: inline-block;
    width: var(--space-4);
    height: var(--space-4);
    margin-inline-end: var(--space-2);
    background: var(--sample);
    border-radius: var(--radius-sm);
    vertical-align: middle;
  }
}

.ct-context-proof__result {
  background: var(--sample, var(--proof-color, var(--surface-2)));

  > span,
  > strong,
  > code {
    align-self: flex-start;
    padding: var(--space-1) var(--space-2);
    background: color-mix(in oklch, var(--surface-0) 78%, transparent);
    border-radius: var(--radius-sm);
    color: var(--text-0);
  }
}

.ct-context-proof__arrow {
  align-self: center;
  color: var(--accent-text);
  font-size: var(--text-xl);
}

.ct-context-proof--mix,
.ct-context-proof--current {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
}

.ct-context-proof--variables,
.ct-context-proof--branches {
  grid-template-columns: 1fr;
}

.ct-context-proof__flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.ct-context-proof__branches {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);

  article {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: var(--space-3);
  }
}

.ct-palette-proof {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: stretch;
}

.ct-palette-proof__rows {
  display: grid;
  gap: var(--space-3);
}

.ct-palette-proof__row {
  display: grid;
  grid-template-columns: var(--space-24) repeat(3, minmax(0, 1fr));
  min-height: var(--space-32);
  overflow: hidden;
  border-radius: var(--radius-lg);

  > strong {
    display: flex;
    align-items: center;
    padding: var(--space-4);
    background: var(--surface-1);
    color: var(--text-2);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: var(--weight-regular);
    text-transform: uppercase;
  }

  > span {
    display: flex;
    align-items: end;
    min-width: 0;
    padding: var(--space-3);
    background: var(--proof-color);
  }

  code {
    padding: var(--space-1) var(--space-2);
    background: color-mix(in oklch, var(--surface-0) 78%, transparent);
    border-radius: var(--radius-sm);
    color: var(--text-0);
    font-size: var(--text-xs);
  }
}

.ct-palette-proof__output {
  display: flex;
  align-items: center;
  margin: 0;
  padding: var(--space-6);
  overflow-x: auto;
  background: var(--surface-1);
  border-radius: var(--radius-lg);

  code {
    color: var(--accent-text);
    font-size: var(--text-sm);
  }
}

.ct-scale-proof {
  display: grid;
  grid-template-columns: var(--space-32) minmax(0, 1fr);
  gap: var(--space-5);
  align-items: stretch;
}

.ct-scale-proof__source {
  display: grid;
  grid-template-rows: minmax(var(--space-24), 1fr) auto;
  gap: var(--space-3);

  > span {
    background: var(--proof-color);
    border-radius: var(--radius-lg);
  }

  code {
    color: var(--text-2);
    font-size: var(--text-xs);
  }
}

.ct-scale-proof__ramp {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(var(--space-20), 1fr);
  min-height: calc(var(--space-32) + var(--space-8));
  overflow-x: auto;
  border-radius: var(--radius-lg);

  > span {
    display: flex;
    align-items: end;
    min-width: 0;
    padding: var(--space-3);
    background: var(--proof-color);
  }

  code {
    padding: var(--space-1) var(--space-2);
    background: color-mix(in oklch, var(--surface-0) 78%, transparent);
    border-radius: var(--radius-sm);
    color: var(--text-0);
    font-size: var(--text-xs);
  }
}

.ct-scale-proof__interval {
  grid-column: 2;
  margin: 0;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);

  strong { color: var(--accent-text); }
}

.ct-harmony-proof {
  display: grid;
  grid-template-columns: minmax(var(--space-40), 1fr) minmax(0, 2fr);
  gap: var(--space-10);
  align-items: center;
  padding: var(--space-8);
  background: var(--surface-1);
  border-radius: var(--radius-xl);
}

.ct-harmony-proof__wheel {
  width: min(100%, calc(var(--space-32) * 2));
  margin: auto;
  color: var(--text-3);

  > circle:first-of-type {
    stroke-dasharray: 2 5;
  }

  polygon {
    stroke: var(--accent-text);
    stroke-width: 2;
  }

  text {
    fill: var(--text-2);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }
}

.ct-harmony-proof__result {
  display: grid;
  gap: var(--space-4);

  .ct-palette-strip {
    min-height: calc(var(--space-32) + var(--space-8));
  }

  .ct-palette-strip span {
    display: flex;
    align-items: end;
    padding: var(--space-3);
  }

  .ct-palette-strip code {
    padding: var(--space-1) var(--space-2);
    background: color-mix(in oklch, var(--surface-0) 78%, transparent);
    border-radius: var(--radius-sm);
    color: var(--text-0);
    font-size: var(--text-xs);
  }

  > p {
    display: flex;
    gap: var(--space-3);
    margin: 0;
    color: var(--text-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }

  strong { color: var(--accent-text); }
}

.ct-dark-mode-proof {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.ct-dark-mode-proof__theme {
  display: grid;
  gap: var(--space-3);
  margin: 0;

  figcaption {
    color: var(--text-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }
}

.ct-dark-mode-proof__fragment {
  display: grid;
  align-content: center;
  gap: var(--space-4);
  min-height: calc(var(--space-32) * 2);
  padding: var(--space-8);
  background: var(--theme-background);
  border: 1px solid var(--theme-border);
  border-radius: var(--radius-xl);
  color: var(--theme-text);

  span {
    color: var(--theme-accent);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
  }

  strong {
    max-width: 16ch;
    font-size: var(--text-2xl);
  }

  i {
    width: var(--space-16);
    height: var(--space-2);
    background: var(--theme-accent);
    border-radius: var(--radius-full);
  }
}

.ct-dark-mode-proof__roles {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;

  > div {
    display: grid;
    grid-template-columns: var(--space-24) minmax(0, 1fr);
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--surface-1);
    border-radius: var(--radius-md);
  }

  dt {
    color: var(--text-2);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
  }

  dd {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    margin: 0;
  }

  code { color: var(--text-1); font-size: var(--text-xs); }
  span { color: var(--accent-text); }
}

.ct-gradient-proof {
  display: grid;
  gap: var(--space-4);
}

.ct-gradient-proof__browser {
  min-height: calc(var(--space-32) * 2);
  border-radius: var(--radius-xl);
}

.ct-gradient-proof__css {
  display: block;
  overflow-x: auto;
  color: var(--text-2);
  font-size: var(--text-xs);
  white-space: nowrap;
}

.ct-gradient-proof__samples {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-2);

  > span {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--surface-1);
    border-radius: var(--radius-md);
  }

  i {
    width: var(--space-8);
    aspect-ratio: 1;
    background: var(--sample);
    border-radius: var(--radius-sm);
  }

  code {
    color: var(--text-2);
    font-size: var(--text-xs);
  }
}

@media (width <= 768px) {
  .ct-section { padding-block: var(--space-16); }
  .ct-visual { padding: var(--space-5); }
  .ct-visual::before { inset: 0; }
  .ct-stat-grid { grid-template-columns: 1fr; }
  .ct-flow-row { grid-template-columns: auto minmax(0, 1fr); }
  .ct-result,
  .ct-status { grid-column: 2; }
  .ct-object-data { grid-template-columns: 1fr; }
  .ct-repair-comparison,
  .ct-repair-comparison:has(.ct-repair-comparison__arrow) { grid-template-columns: 1fr; }
  .ct-repair-comparison__arrow { justify-self: center; transform: rotate(90deg); }
  .ct-repair-sample { min-height: calc(var(--space-24) * 2); }
  .ct-repair-pipeline li { grid-template-columns: auto minmax(0, 1fr); }
  .ct-repair-pipeline code { grid-column: 2; }
  .ct-vision-matrix-wrap {
    margin-inline: calc(var(--space-5) * -1);
    padding-inline: var(--space-5);
  }
  .ct-primary-proof { padding-block: var(--space-8) var(--space-16); }
  .ct-primary-proof__caption { grid-template-columns: 1fr; }
  .ct-operation-proof { padding: var(--space-4); }
  .ct-operation-proof--hue { grid-template-columns: 1fr; }
  .ct-mix-proof__row { grid-template-columns: 1fr; }
  .ct-mix-proof__row > code { justify-self: start; }
  .ct-context-proof,
  .ct-context-proof--mix,
  .ct-context-proof--current,
  .ct-context-proof__flow,
  .ct-context-proof__branches,
  .ct-context-proof__branches article { grid-template-columns: 1fr; }
  .ct-context-proof__arrow { transform: rotate(90deg); }
  .ct-palette-proof,
  .ct-scale-proof,
  .ct-harmony-proof,
  .ct-dark-mode-proof { grid-template-columns: 1fr; }
  .ct-palette-proof__row { grid-template-columns: var(--space-20) repeat(3, minmax(var(--space-20), 1fr)); }
  .ct-palette-proof__rows { overflow-x: auto; }
  .ct-scale-proof__interval { grid-column: 1; }
  .ct-harmony-proof { padding: var(--space-5); }
  .ct-dark-mode-proof__roles { grid-template-columns: 1fr; }
  .ct-gradient-proof__samples {
    grid-auto-flow: column;
    grid-auto-columns: var(--space-32);
    grid-template-columns: none;
    overflow-x: auto;
  }
}
}
@layer page {
/* ============================================================
   FEATURES
   Feature landing pages and bento grids.
   ============================================================ */

/* --- Bento grid --- */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  padding: var(--space-8) var(--gutter);
  max-width: 72rem;
  margin-inline: auto;
}
.bento-card {
  background: var(--surface-1);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--duration-fast);

  &:hover {
    border-color: var(--border-default);
  }
  &.wide {
    grid-column: span 2;
  }

  h3 {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--text-0);
    margin-bottom: var(--space-2);
  }
  p {
    font-size: var(--text-sm);
    color: var(--text-1);
  }
}

/* --- Demo page --- */
.demo-shell {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}
.demo-code {
  background: var(--surface-1);
  border-right: 1px solid var(--border-subtle);
  padding: var(--space-8);
  overflow-y: auto;
}
.demo-tabs {
  display: flex;
  gap: 1px;
  margin-bottom: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-2);
}
.demo-tab {
  padding: var(--space-2) var(--space-4);
  background: var(--surface-2);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;

  &.active {
    background: var(--surface-0);
    color: var(--text-0);
  }
}
.demo-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 1px 1px, var(--border-subtle) 1px, transparent 0)
    0 0 / 24px 24px;
  position: relative;
  overflow: hidden;
}
.demo-stage-placeholder {
  text-align: center;
  color: var(--text-2);
}

.demo-steps {
  padding: var(--space-12) var(--gutter);
  max-width: 48rem;
  margin-inline: auto;
}
.demo-step {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border-subtle);

  h3 {
    font-size: var(--text-xl);
    font-weight: 400;
    color: var(--text-0);
    margin-bottom: var(--space-2);
  }
  p {
    font-size: var(--text-sm);
    color: var(--text-1);
  }
}
.demo-step-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-2);
  margin-bottom: var(--space-2);
}

.demo-output {
  background: var(--surface-1);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-6) var(--gutter);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-1);
}

@media (width <= 768px) {
  .demo-shell { grid-template-columns: 1fr; }
  .bento-grid { grid-template-columns: 1fr; }
  .bento-card.wide { grid-column: span 1; }
}

/* ============================================================
   /color feature tour: 13 features in 4 chapters. Accent
   comes from the .accent-* class on each .fx-chapter; blocks
   inherit derived tokens. Prefix .fx- (the parked tier above
   owns .bento- / .demo-).
   ============================================================ */

.fx-proof {
  padding-block: var(--space-6) var(--space-16);
}

.fx-topic-nav {
  max-width: 68rem;
  margin-inline: auto;
  padding: var(--space-8) var(--space-6) var(--space-12);
  text-align: center;

  > .eyebrow {
    margin-block-end: var(--space-5);
    color: var(--accent-text);
  }
}

.fx-topic-links {
  --cluster-gap: var(--space-2);

  a {
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    background: var(--surface-1);
    color: var(--text-1);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    text-decoration: none;
    transition: background var(--duration-fast), border-color var(--duration-fast), color var(--duration-fast);

    &:hover {
      border-color: var(--accent-border);
      background: var(--accent-surface);
      color: var(--accent-text);
    }

    &:focus-visible {
      outline: 2px solid var(--accent-text);
      outline-offset: var(--space-1);
    }
  }
}

/* Giant breathing room between chapters: each carries space-24 top
   and bottom, so consecutive chapters sit two full units apart. */
.fx-chapter {
  max-width: 68rem;
  margin-inline: auto;
  padding-block: var(--space-24);
  padding-inline: var(--space-6);

  > .eyebrow {
    color: var(--accent-text);
    text-align: center;
  }
}
.fx-chapter-title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-light);
  margin-block: var(--space-3) var(--space-16);
  text-align: center;
  text-wrap: balance;
}

.fx-rows {
  display: flex;
  flex-direction: column;
  gap: var(--space-20);
}

/* One feature = one horizontal row: copy left, code or
   illustration right. */
.fx-feature {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: var(--space-12);
  align-items: center;
  text-align: left;

  > * { min-width: 0; }
}
@media (width <= 900px) {
  .fx-feature { grid-template-columns: 1fr; gap: var(--space-6); }
}
.fx-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-3);
}

.fx-title-link {
  color: inherit;
  text-decoration-color: transparent;
  text-underline-offset: var(--space-1);
  transition: color var(--duration-fast), text-decoration-color var(--duration-fast);

  &:hover {
    color: var(--accent-text);
    text-decoration-color: var(--accent-border);
  }

  &:focus-visible {
    outline: 2px solid var(--accent-text);
    outline-offset: var(--space-1);
  }
}

.fx-desc {
  color: var(--text-1);
  max-width: 44ch;
}

.fx-action {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-block-start: var(--space-4);
  color: var(--accent-text);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  text-decoration: none;

  span {
    transition: transform var(--duration-fast) var(--ease-out-expo);
  }

  &:hover span { transform: translateX(var(--space-1)); }

  &:focus-visible {
    outline: 2px solid var(--accent-text);
    outline-offset: var(--space-1);
  }
}

/* Two-column feature: code beside its rendered result. Collapses
   under 900px. */
.fx-pair {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: var(--space-8);
  align-items: center;
  text-align: left;

  > * { min-width: 0; }
}
@media (width <= 900px) {
  .fx-pair { grid-template-columns: 1fr; }
}

/* Gradient swatch: any CSS background, fixed height. */
.fx-gradient {
  height: 3.5rem;
  border-radius: var(--radius-md);
}
}
@layer page {
/* /color/spaces: educational overview and text-led reference. Prefix .sp-. */

.sp-directory {
  max-width: 68rem;
  margin-inline: auto;
  padding: var(--space-8) var(--space-6) var(--space-20);
}

.sp-directory-header {
  max-width: calc(var(--space-24) * 6);
  margin-block-end: var(--space-8);

  h2 {
    margin-block: var(--space-2) var(--space-3);
    font-size: var(--text-2xl);
  }

  > p:not(.eyebrow) {
    color: var(--text-2);
  }
}

.sp-directory-list {
  border-block-start: 1px solid var(--border-default);
}

.sp-directory-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.7fr) minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--space-4);
  align-items: baseline;
  padding-block: var(--space-4);
  color: var(--text-1);
  text-decoration: none;
  border-block-end: 1px solid var(--border-subtle);

  strong {
    color: var(--text-0);
    font-size: var(--text-lg);
  }

  code,
  .sp-directory-category {
    color: var(--text-3);
    font-size: var(--text-sm);
  }

  &:hover {
    strong {
      color: var(--accent-text);
    }
  }
}

@media (width <= 768px) {
  .sp-directory-row {
    grid-template-columns: minmax(0, 1fr) auto;

    code {
      text-align: end;
    }

    .sp-directory-category {
      grid-column: 1;
    }

    .sp-directory-use {
      grid-column: 1 / -1;
    }
  }
}

/* ── Chromaticity atlas ─────────────────────────────────────── */
.sp-atlas {
  max-width: 68rem;
  margin-inline: auto;
  padding: var(--space-8) var(--space-6) var(--space-24);
  display: grid;
  grid-template-columns: minmax(16rem, 2fr) minmax(0, 3fr);
  gap: var(--space-16);
  align-items: center;
}
@media (width <= 900px) {
  .sp-atlas { grid-template-columns: 1fr; gap: var(--space-8); }
}

.sp-atlas-side > .eyebrow { color: var(--accent-text); }
.sp-atlas-desc {
  color: var(--text-1);
  max-width: 40ch;
  margin-block: var(--space-3) var(--space-8);
}

.sp-atlas-legend {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.sp-atlas-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  color: var(--text-1);
  font-size: var(--text-sm);
  padding: var(--space-2) 0;

  input { accent-color: var(--accent); }

  &:hover { color: var(--text-0); }
}
.sp-atlas-swatch {
  inline-size: var(--space-4);
  block-size: 3px;
  border-radius: var(--radius-full);
  background: var(--accent);
}

/* The diagram itself. Everything a human eye can see, faintly lit
   from the white point; each gamut is a stroked triangle. */
.sp-atlas-locus {
  fill: color-mix(in oklch, var(--surface-2) 70%, var(--surface-3));
  stroke: var(--border-default);
  stroke-width: 1.5;
}
.sp-atlas-gamut {
  polygon {
    fill: transparent;
    stroke: var(--accent);
    stroke-width: 3;
    stroke-linejoin: round;
    transition: opacity var(--duration-fast);
  }

  text {
    fill: var(--accent-text);
    font-family: var(--font-mono-ui);
    font-size: 24px;
    transition: opacity var(--duration-fast);
  }
}
.sp-atlas-white {
  circle {
    fill: var(--text-0);
    stroke: var(--surface-0);
    stroke-width: 2;
  }

  text {
    fill: var(--text-3);
    font-family: var(--font-mono-ui);
    font-size: 22px;
  }
}

/* Pure-CSS layer toggles: unchecked box hides its layer. */
.sp-atlas:has(input[name="atlas-srgb"]:not(:checked)) [data-atlas-layer="srgb"],
.sp-atlas:has(input[name="atlas-a98-rgb"]:not(:checked)) [data-atlas-layer="a98-rgb"],
.sp-atlas:has(input[name="atlas-display-p3"]:not(:checked)) [data-atlas-layer="display-p3"],
.sp-atlas:has(input[name="atlas-rec2020"]:not(:checked)) [data-atlas-layer="rec2020"],
.sp-atlas:has(input[name="atlas-prophoto-rgb"]:not(:checked)) [data-atlas-layer="prophoto-rgb"] {
  opacity: 0;
}

/* Detail page. */
.sp-detail-header {
  padding-block: calc(var(--nav-h) + var(--space-12)) var(--space-10);

  .eyebrow {
    margin-block: var(--space-8) var(--space-3);
    color: var(--accent-text);
  }

  h1 {
    margin-block-end: var(--space-4);
  }

  .body-lg {
    color: var(--text-1);
  }
}

.sp-facts {
  max-width: 62rem;
  margin-inline: auto;
  padding: var(--space-16) var(--space-6) var(--space-8);
}
.sp-facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(15rem, 100%), 1fr));
  gap: var(--space-8) var(--space-10);
  margin: 0;
}
.sp-fact {
  dt {
    font-size: var(--text-xs);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-3);
    margin-block-end: var(--space-2);
  }

  dd {
    margin: 0;
    color: var(--text-1);

    a { color: var(--accent-text); }
  }
}
.sp-channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);

  strong {
    font-family: var(--font-mono);
    font-weight: var(--weight-medium);
    color: var(--text-0);
    margin-inline-end: var(--space-1);
  }
}
.sp-range {
  color: var(--text-3);
  font-size: var(--text-sm);
  margin-inline-start: var(--space-2);
}

.sp-usage {
  max-width: 46rem;
  margin-inline: auto;
  padding: var(--space-8) var(--space-6) var(--space-24);
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}
.sp-section {
  h2 {
    font-size: var(--text-2xl);
    font-weight: var(--weight-medium);
    margin-block-end: var(--space-3);
  }

  > p {
    color: var(--text-1);
    margin-block-end: var(--space-6);
  }
}
}