/* ==========================================================================
   Swatchbook — chrome tokens, shell and shared widgets.
   Components use tokens only. Literal colours appear in this file ONLY inside
   the three token blocks below. Taught colours are set inline by JS.
   ========================================================================== */

/* ---- 1. Tokens ---------------------------------------------------------- */

:root {
  color-scheme: light;

  --bg: #F2F3F5;
  --surface: #FFFFFF;
  --surface-2: #E9EBEF;
  --line: #D5D8DF;
  --ink: #14161C;
  --ink-2: #5A6070;
  --accent: #2F3CE0;
  --on-accent: #FFFFFF;
  --good: #1E8A4C;
  --warn: #B26A00;
  --bad: #C8322B;
  --shadow-float: 0 12px 32px rgb(20 22 28 / 0.16), 0 2px 6px rgb(20 22 28 / 0.08);
  --scrim: rgb(20 22 28 / 0.4);

  /* derived, still token-only */
  --accent-soft: color-mix(in oklab, var(--accent) 9%, var(--surface));
  --accent-hover: color-mix(in oklab, var(--accent) 86%, var(--ink));
  --line-strong: color-mix(in oklab, var(--line) 55%, var(--ink-2));

  /* type */
  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI Variable Display", "Segoe UI", system-ui, sans-serif;
  --font-body: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --fs-micro: 0.6875rem;  /* 11 */
  --fs-xs: 0.75rem;       /* 12 */
  --fs-sm: 0.8125rem;     /* 13 */
  --fs-base: 1rem;        /* 16 */
  --fs-md: 1.125rem;      /* 18 */
  --fs-lg: 1.375rem;      /* 22 */
  --fs-xl: clamp(1.75rem, 1.3rem + 1.9vw, 2.5rem);
  --fs-idea: clamp(1.25rem, 1.05rem + 0.9vw, 1.625rem);

  /* space (4px grid) */
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 24px;
  --s6: 32px;
  --s7: 48px;
  --s8: 72px;

  --radius: 4px;
  --rail-w: 256px;
  --bar-h: 52px;
  --content-w: 1040px;
  --measure: 62ch;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #101216;
    --surface: #181B21;
    --surface-2: #22262E;
    --line: #2E333D;
    --ink: #ECEEF2;
    --ink-2: #9CA3B2;
    --accent: #8C96FF;
    --on-accent: #0B0E2A;
    --good: #4CC38A;
    --warn: #F1A10D;
    --bad: #FF6369;
    --shadow-float: 0 12px 32px rgb(0 0 0 / 0.5), 0 2px 6px rgb(0 0 0 / 0.4);
    --scrim: rgb(0 0 0 / 0.55);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101216;
  --surface: #181B21;
  --surface-2: #22262E;
  --line: #2E333D;
  --ink: #ECEEF2;
  --ink-2: #9CA3B2;
  --accent: #8C96FF;
  --on-accent: #0B0E2A;
  --good: #4CC38A;
  --warn: #F1A10D;
  --bad: #FF6369;
  --shadow-float: 0 12px 32px rgb(0 0 0 / 0.5), 0 2px 6px rgb(0 0 0 / 0.4);
  --scrim: rgb(0 0 0 / 0.55);
}

/* ---- 2. Base ------------------------------------------------------------ */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--bar-h) + var(--s4));
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

[hidden] { display: none !important; }

h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
h1, h2, h3 { text-wrap: balance; line-height: 1.15; }
p { text-wrap: pretty; max-width: var(--measure); }
img, svg, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}
[tabindex="-1"]:focus { outline: none; }

::selection { background: color-mix(in oklab, var(--accent) 28%, transparent); }

.icon { width: 1em; height: 1em; flex: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---- 3. Reusable helpers for lesson authors ----------------------------- */

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "zero" 0;
  letter-spacing: -0.01em;
}

.micro {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.caption {
  font-size: var(--fs-sm);
  line-height: 1.45;
  color: var(--ink-2);
  max-width: var(--measure);
}

.big-number {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.75rem, 1.4rem + 1.4vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.stack { display: flex; flex-direction: column; gap: var(--s4); min-width: 0; }
.stack--sm { gap: var(--s2); }
.stack--lg { gap: var(--s6); }

.row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s3); min-width: 0; }
.row--top { align-items: flex-start; }
.row--end { align-items: flex-end; }
.row--between { justify-content: space-between; }
.row > .grow, .grow { flex: 1 1 0; min-width: 0; }

.grid-2, .grid-3 { display: grid; gap: var(--s5); min-width: 0; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 > *, .grid-3 > * { min-width: 0; }
@media (max-width: 720px) {
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
}
@media (min-width: 721px) and (max-width: 1100px) {
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--s5);
  min-width: 0;
}
.panel--flush { padding: 0; overflow: hidden; }
.panel--sunken { background: var(--surface-2); border-color: transparent; }

/* inline-sized widgets keep their own width inside vertical stacks */
:is(.stack, .lesson-section__body, .sb-challenge__body, .lesson-body) > :is(.sb-contrast, .sb-seg, .sb-toggle, .btn, .sb-swatch--sm, .sb-swatch--md, .kind-tag) {
  align-self: flex-start;
}

/* wide content (mock UIs, tables) scrolls inside its own box, never the page */
.scroll-x { overflow-x: auto; max-width: 100%; overscroll-behavior-x: contain; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s2);
  min-height: 36px;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 0.12s, border-color 0.12s;
}
.btn:hover { background: var(--surface-2); }
.btn:active { transform: translateY(1px); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; }
.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.btn--primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn--quiet { border-color: transparent; background: transparent; color: var(--ink-2); }
.btn--quiet:hover { color: var(--ink); background: var(--surface-2); }
.btn--sm { min-height: 28px; padding: 3px 10px; font-size: var(--fs-sm); }
.btn .icon { font-size: 1rem; }

/* ---- 4. Shell ----------------------------------------------------------- */

.app {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  min-height: 100vh;
  min-height: 100dvh;
}

.skip-link {
  position: fixed;
  left: var(--s3); top: var(--s3);
  z-index: 100;
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

.topbar { display: none; }
.scrim { display: none; }

.rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-right: 1px solid var(--line);
  min-width: 0;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1;
}
.wordmark svg { width: 30px; height: 26px; flex: none; }
.wordmark__pin { fill: var(--ink); }
.wordmark__blade { stroke: var(--surface); stroke-width: 0.75; }

.rail__head { padding: var(--s5) var(--s5) var(--s4); }

.rail__progress { padding: 0 var(--s5) var(--s4); }
.rail__progress-row {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 6px;
}
.rail__progress-row .mono { font-size: var(--fs-xs); color: var(--ink); }

.meter {
  height: 4px;
  background: var(--surface-2);
  border-radius: 2px;
  overflow: hidden;
}
.meter > span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.25s ease;
}

.rail__scroll {
  flex: 1 1 auto;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--s2) var(--s3) var(--s5);
  border-top: 1px solid var(--line);
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
  /* Scroll hints: a soft shadow shows at whichever edge still has lessons beyond it.
     The two "local" covers travel with the content and hide the shadow at each end. */
  background:
    linear-gradient(var(--surface) 40%, transparent) center top / 100% 32px no-repeat local,
    linear-gradient(transparent, var(--surface) 60%) center bottom / 100% 32px no-repeat local,
    linear-gradient(color-mix(in srgb, var(--ink) 16%, transparent), transparent) center top / 100% 12px no-repeat scroll,
    linear-gradient(transparent, color-mix(in srgb, var(--ink) 16%, transparent)) center bottom / 100% 12px no-repeat scroll;
}

.rail-module { padding-top: var(--s4); }
.rail-module__head {
  display: flex; align-items: center; gap: var(--s2);
  padding: 0 var(--s3) 6px;
}
.rail-module__chip {
  width: 10px; height: 14px; flex: none;
  border-radius: 2px;
  background: var(--chip);
}
.rail-module__title { font-size: var(--fs-sm); font-weight: 600; color: var(--ink); }
.rail-module__count { margin-left: auto; font-size: var(--fs-micro); color: var(--ink-2); }

.rail-lesson {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 16px;
  align-items: center;
  gap: var(--s2);
  padding: 6px var(--s3);
  border-radius: var(--radius);
  color: var(--ink-2);
  font-size: var(--fs-sm);
  line-height: 1.3;
  text-decoration: none;
  position: relative;
}
.rail-lesson:hover { background: var(--surface-2); color: var(--ink); }
.rail-lesson__code { font-size: var(--fs-micro); color: var(--ink-2); white-space: nowrap; }
.rail-lesson__title { min-width: 0; }
.rail-lesson__tick { color: var(--good); font-size: 0.875rem; }
.rail-lesson[aria-current="page"] {
  background: var(--surface-2);
  color: var(--ink);
  font-weight: 600;
}
.rail-lesson[aria-current="page"]::before {
  content: "";
  position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 3px; border-radius: 2px;
  background: var(--chip, var(--accent));
}
.rail-soon { padding: 4px var(--s3) 6px; font-size: var(--fs-sm); color: var(--ink-2); }

.rail__foot {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s2);
  padding: var(--s3);
  border-top: 1px solid var(--line);
}
.rail__foot .btn { min-width: 0; }
.rail__foot .btn[aria-current="page"] { color: var(--ink); background: var(--surface-2); }

.main { min-width: 0; }
.view {
  max-width: calc(var(--content-w) + 2 * var(--gutter));
  padding: var(--s7) var(--gutter) var(--s8);
  --gutter: clamp(16px, 4.5vw, 56px);
}

/* below 860px the rail becomes a drawer under a top bar */
@media (max-width: 859.98px) {
  .app { display: block; }

  .topbar {
    position: sticky; top: 0; z-index: 30;
    display: flex; align-items: center; justify-content: space-between;
    height: var(--bar-h);
    padding: 0 var(--s2) 0 var(--s4);
    background: var(--surface);
    border-bottom: 1px solid var(--line);
  }
  .topbar .wordmark { font-size: 1.125rem; }
  .topbar .wordmark svg { width: 26px; height: 22px; }
  .topbar__right { display: flex; align-items: center; gap: var(--s2); }
  .topbar__pct { font-size: var(--fs-xs); color: var(--ink-2); }

  .rail {
    position: fixed;
    top: var(--bar-h); left: 0; right: 0;
    z-index: 29;
    height: auto;
    max-height: calc(100dvh - var(--bar-h));
    border-right: 0;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-float);
    display: none;
  }
  .rail__head { display: none; }
  .rail__progress { padding-top: var(--s4); }
  .app.is-menu-open .rail { display: flex; }
  .app.is-menu-open .scrim {
    display: block;
    position: fixed; inset: var(--bar-h) 0 0 0;
    z-index: 28;
    background: var(--scrim);
    border: 0; padding: 0;
  }
  .rail-lesson { padding-block: 9px; }
  .view { padding-top: var(--s6); padding-bottom: var(--s7); }
}

/* ---- 5. Home ------------------------------------------------------------ */

.hero { display: grid; gap: var(--s4); padding-bottom: var(--s6); }
.hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  max-width: 18ch;
}
.hero__cta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s4); margin-top: var(--s2); }
.hero__cta .btn { min-height: 44px; padding-inline: 18px; font-size: 0.9375rem; }
.hero__next { display: grid; gap: 2px; font-size: var(--fs-sm); color: var(--ink-2); min-width: 0; }
.hero__next strong { color: var(--ink); font-weight: 600; }

.strip { display: grid; gap: var(--s2); margin-top: var(--s2); }
.strip__bar {
  display: flex;
  height: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.strip__seg { flex: 1 1 0; background: var(--surface-2); }
.strip__seg + .strip__seg { border-left: 1px solid var(--surface); }
.strip__seg.is-done { background: var(--chip); }
.strip__meta { display: flex; flex-wrap: wrap; gap: var(--s2) var(--s5); font-size: var(--fs-xs); color: var(--ink-2); }

.module-row {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: var(--s5);
  padding: var(--s6) 0;
  border-top: 1px solid var(--line);
}
.module-row__head { display: grid; gap: var(--s1); align-content: start; }
.module-row__code { display: flex; align-items: center; gap: var(--s2); }
.module-row__code i { width: 10px; height: 14px; border-radius: 2px; background: var(--chip); }
.module-row__title {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: var(--s1);
}
.module-row__tagline { font-size: var(--fs-sm); color: var(--ink-2); }
.module-row__count { font-size: var(--fs-xs); color: var(--ink-2); margin-top: var(--s2); }

.chips {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(124px, 1fr));
  gap: var(--s4);
}

/* the signature: a cut paint chip */
.chip-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  color: var(--ink);
  text-decoration: none;
  transition: transform 0.14s ease, border-color 0.14s ease;
}
a.chip-card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.chip-card__block {
  position: relative;
  height: 96px;
  background: var(--chip);
}
.chip-card__done {
  position: absolute; top: 8px; right: 8px;
  display: grid; place-items: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--surface);
  color: var(--good);
  font-size: 0.875rem;
}
.chip-card__band {
  display: grid;
  gap: 3px;
  padding: 10px 12px 12px;
  border-top: 1px solid var(--line);
  flex: 1 1 auto;
  align-content: start;
}
.chip-card__code { font-size: var(--fs-micro); color: var(--ink-2); display: flex; justify-content: space-between; gap: var(--s2); }
.chip-card__title { font-size: 0.9375rem; font-weight: 600; line-height: 1.25; }
.chip-card--soon { border-style: dashed; }
.chip-card--soon .chip-card__block { opacity: 0.35; }
.chip-card--soon .chip-card__title { color: var(--ink-2); font-weight: 500; }

.home-foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s3);
  padding-top: var(--s5);
  border-top: 1px solid var(--line);
}

@media (max-width: 720px) {
  .module-row { grid-template-columns: minmax(0, 1fr); gap: var(--s4); padding: var(--s5) 0; }
  .chips { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s3); }
  .chip-card__block { height: 72px; }
}

/* ---- 6. Lesson page ----------------------------------------------------- */

.lesson-head { display: grid; gap: var(--s4); padding-bottom: var(--s6); }
.lesson-head__meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2) var(--s3); font-size: var(--fs-xs); color: var(--ink-2); }
.lesson-head__chip {
  width: 28px; height: 36px; flex: none;
  display: flex; flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
  background: var(--surface);
}
.lesson-head__chip::before { content: ""; flex: 1 1 auto; background: var(--chip); }
.lesson-head__chip::after { content: ""; height: 10px; border-top: 1px solid var(--line); }
.lesson-head__code { color: var(--ink); font-weight: 600; font-size: var(--fs-sm); }
.lesson-head__sep { color: var(--line-strong); }
.lesson-head__done {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px 2px 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-weight: 500;
}
.lesson-head__done .icon { color: var(--good); font-size: 0.875rem; }
.lesson-head__title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}
.lesson-head__idea {
  font-family: var(--font-display);
  font-size: var(--fs-idea);
  font-weight: 450;
  line-height: 1.25;
  letter-spacing: -0.012em;
  max-width: 34ch;
  padding-left: var(--s4);
  border-left: 3px solid var(--chip, var(--accent));
}

.lesson-body { display: flex; flex-direction: column; gap: var(--s4); min-width: 0; }
.lesson-body > p { max-width: var(--measure); }

.lesson-section {
  padding: var(--s6) 0 var(--s5);
  border-top: 1px solid var(--line);
  min-width: 0;
}
.lesson-section__head { display: grid; gap: var(--s2); justify-items: start; margin-bottom: var(--s5); }
.lesson-section__head:has(.lesson-section__title:empty) { margin-bottom: var(--s4); }
.lesson-section__title {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 650;
  letter-spacing: -0.02em;
}
.lesson-section__title:empty { display: none; }
.lesson-section__body { display: flex; flex-direction: column; gap: var(--s5); min-width: 0; }

.kind-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px 3px 6px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.kind-tag .icon { font-size: 0.75rem; }
.lesson-section--try .kind-tag { color: var(--ink); border-color: var(--line-strong); }

.lesson-foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--s4);
  margin-top: var(--s6);
  padding-top: var(--s5);
  border-top: 1px solid var(--line);
}
.lesson-foot__link {
  display: grid;
  gap: 2px;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  text-align: left;
  min-width: 0;
  transition: border-color 0.12s, background-color 0.12s;
}
.lesson-foot__link:hover { border-color: var(--line-strong); }
.lesson-foot__dir { display: inline-flex; align-items: center; gap: 6px; }
.lesson-foot__title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
/* phones: the next lesson's name wraps instead of being cut to "M1·03 The whe…" */
@media (max-width: 560px) {
  .lesson-foot__title { white-space: normal; text-wrap: balance; font-size: var(--fs-sm); line-height: 1.3; }
}
.lesson-foot__link--next { text-align: right; background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.lesson-foot__link--next:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.lesson-foot__link--next .micro { color: inherit; opacity: 0.85; }
.lesson-foot__link--next .lesson-foot__dir { justify-content: flex-end; }

.error-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--s3);
  padding: var(--s4);
  border: 1px solid var(--bad);
  border-radius: var(--radius);
  background: var(--surface);
}
.error-card > .icon { color: var(--bad); font-size: 1.25rem; margin-top: 2px; }
.error-card__title { font-weight: 600; }
.error-card__msg { font-size: var(--fs-sm); color: var(--ink-2); white-space: pre-wrap; margin-top: var(--s1); }

/* ---- 7. Cheat sheet ----------------------------------------------------- */

.page-head { display: grid; gap: var(--s3); padding-bottom: var(--s6); }
.page-head__title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.rules {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 290px), 1fr));
  gap: var(--s4);
}
.rule-card {
  display: flex; flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
}
.rule-card__fig {
  display: flex; flex-direction: column; justify-content: center; gap: var(--s3);
  min-height: 148px;
  padding: var(--s4);
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.rule-card__text { display: grid; gap: 6px; padding: var(--s4); }
.rule-card__head {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
}
.rule-card__rule { font-size: 0.9375rem; color: var(--ink-2); line-height: 1.4; }

/* figures inside rule cards: colours are inline, structure is here */
.cs-sample {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s2) var(--s3);
  padding: var(--s3) var(--s4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}
.cs-sample__text { font-weight: 500; min-width: 0; }
.cs-sample > .sb-contrast { flex: none; }   /* the badge keeps its full width; it drops below the text when the card is narrow */
.cs-sample__text--lg { font-family: var(--font-display); font-size: 1.75rem; font-weight: 700; line-height: 1; }
.cs-bar { display: flex; height: 56px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.cs-bar > span { display: flex; align-items: flex-end; padding: 6px 8px; font-size: var(--fs-xs); font-weight: 600; min-width: 0; }
.cs-btns { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); padding: var(--s4); border: 1px solid var(--line); border-radius: var(--radius); }
.cs-btn { padding: 7px 14px; border-radius: var(--radius); font-size: var(--fs-sm); font-weight: 600; border: 1px solid transparent; }
.cs-swatches { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px 6px; }
.cs-swatches > div { display: grid; gap: 4px; justify-items: start; min-width: 0; }
.cs-swatches i { display: block; width: 100%; height: 26px; border-radius: 3px; border: 1px solid var(--line); }
.cs-swatches span { font-size: 0.6875rem; white-space: nowrap; color: var(--ink-2); letter-spacing: 0; text-transform: none; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.cs-pair { display: grid; grid-template-columns: 52px minmax(0, 1fr); align-items: center; gap: var(--s2); }
.cs-duo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s2); }
.cs-mini { display: grid; gap: 6px; padding: 10px; border-radius: var(--radius); min-width: 0; }
.cs-mini__card { display: grid; gap: 6px; padding: 8px; border-radius: 3px; border: 1px solid transparent; }
.cs-mini__line { height: 6px; border-radius: 3px; }
.cs-mini__btn { justify-self: start; padding: 3px 8px; border-radius: 3px; font-size: 0.6875rem; font-weight: 600; }
.cs-verdict { display: inline-flex; align-items: center; gap: 4px; font-size: var(--fs-xs); color: var(--ink); margin-top: 2px; }
.cs-verdict--bad .icon { color: var(--bad); }
.cs-verdict--good .icon { color: var(--good); }
.cs-status { display: inline-flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: var(--radius); border: 1px solid transparent; font-size: var(--fs-sm); font-weight: 600; }
.cs-status i { width: 10px; height: 10px; border-radius: 50%; }
.cs-people { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 4px; }
.cs-people svg { width: 100%; height: auto; color: var(--line-strong); }
.cs-people svg.is-on { color: var(--ink); }
.cs-cvd { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 6px var(--s2); }
.cs-cvd__pair { display: flex; height: 22px; border-radius: 3px; overflow: hidden; border: 1px solid var(--line); }
.cs-cvd__pair i { flex: 1 1 0; }

/* ---- 8. Widgets --------------------------------------------------------- */

.sb-label { display: block; font-size: var(--fs-sm); font-weight: 600; color: var(--ink); }

/* slider */
.sb-slider { display: grid; gap: 2px; min-width: 0; align-content: start; }
.sb-slider__head { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s3); }
.sb-slider__head label { font-size: var(--fs-sm); font-weight: 600; }
.sb-slider__value { font-size: var(--fs-sm); color: var(--ink); white-space: nowrap; }
.sb-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 30px;
  margin: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  touch-action: pan-y;
  --track: linear-gradient(to right, var(--accent) var(--pct, 50%), var(--surface-2) var(--pct, 50%));
}
.sb-slider input[type="range"]::-webkit-slider-runnable-track {
  height: 12px;
  border-radius: 3px;
  background: var(--track);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}
.sb-slider input[type="range"]::-moz-range-track {
  height: 12px;
  border-radius: 3px;
  background: var(--track);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}
.sb-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 24px;
  margin-top: -6px;
  border: 2px solid var(--ink);
  border-radius: 3px;
  background: var(--surface);
}
.sb-slider input[type="range"]::-moz-range-thumb {
  width: 10px;
  height: 20px;
  border: 2px solid var(--ink);
  border-radius: 3px;
  background: var(--surface);
}
.sb-slider input[type="range"]:focus-visible { outline: none; }
.sb-slider input[type="range"]:focus-visible::-webkit-slider-thumb { outline: 2px solid var(--accent); outline-offset: 2px; }
.sb-slider input[type="range"]:focus-visible::-moz-range-thumb { outline: 2px solid var(--accent); outline-offset: 2px; }

/* colour input */
.sb-color { display: grid; gap: 6px; min-width: 0; }
.sb-color__row { display: flex; align-items: stretch; gap: var(--s2); }
.sb-color__swatch {
  position: relative;
  width: 40px; height: 40px; flex: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
}
.sb-color__swatch input {
  position: absolute; inset: -4px;
  width: calc(100% + 8px); height: calc(100% + 8px);
  margin: 0; padding: 0; border: 0;
  opacity: 0;
  cursor: pointer;
}
.sb-color__swatch:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.sb-color__hex {
  width: 9.5ch;
  min-width: 0;
  box-sizing: content-box;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 0.9375rem;
}
.sb-color__hex[aria-invalid="true"] { border-color: var(--bad); border-width: 2px; padding: 0 11px; }
.sb-hint {
  display: flex; align-items: flex-start; gap: 6px;
  font-size: var(--fs-sm);
  color: var(--ink);
  max-width: 34ch;
}
.sb-hint .icon { color: var(--bad); margin-top: 3px; }

/* swatch */
.sb-swatch {
  display: inline-flex; flex-direction: column;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  overflow: hidden;
  text-align: left;
  min-width: 0;
  vertical-align: top;
}
.sb-swatch__block { display: flex; align-items: flex-end; background: var(--sw); min-width: 0; }
.sb-swatch__text { display: grid; gap: 1px; padding: 6px 8px 7px; min-width: 0; }
.sb-swatch__label { font-size: var(--fs-sm); font-weight: 600; line-height: 1.25; }
.sb-swatch__sub { font-size: var(--fs-micro); line-height: 1.3; color: var(--ink-2); }
.sb-swatch__label:empty, .sb-swatch__sub:empty { display: none; }
.sb-swatch__text:not(:has(:not(:empty))) { display: none; }
.sb-swatch--sm { flex-direction: row; align-items: center; border-color: transparent; background: transparent; gap: var(--s2); overflow: visible; }
.sb-swatch--sm .sb-swatch__block { width: 32px; height: 32px; border-radius: 3px; border: 1px solid var(--line); flex: none; }
.sb-swatch--sm .sb-swatch__text { padding: 0; }
.sb-swatch--md { width: 96px; }
.sb-swatch--md .sb-swatch__block { height: 64px; }
.sb-swatch--lg { display: flex; width: 100%; min-width: 120px; }
.sb-swatch--lg .sb-swatch__block { height: 128px; }
.sb-swatch--xl { display: flex; width: 100%; }
.sb-swatch--xl .sb-swatch__block { height: clamp(168px, 26vw, 240px); }
.sb-swatch--inside .sb-swatch__block .sb-swatch__text { padding: 12px 14px; color: var(--sw-on); }
.sb-swatch--inside .sb-swatch__sub { color: inherit; opacity: 0.86; font-size: var(--fs-xs); }
.sb-swatch--inside .sb-swatch__label { font-size: 0.9375rem; }
.sb-swatch--xl.sb-swatch--inside .sb-swatch__label { font-family: var(--font-display); font-size: var(--fs-lg); letter-spacing: -0.02em; }
button.sb-swatch { cursor: copy; transition: border-color 0.12s; }
button.sb-swatch:hover { border-color: var(--line-strong); }
button.sb-swatch--sm:hover { border-color: transparent; }
button.sb-swatch--sm:hover .sb-swatch__block { border-color: var(--ink-2); }

/* scale */
.sb-scale {
  display: flex;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
  background: var(--surface);
}
.sb-scale__chip {
  flex: 1 1 0;
  min-width: 0;
  height: 56px;
  display: flex; align-items: flex-end; justify-content: center;
  padding: 0 0 6px;
  border: 0;
  border-radius: 0;
  background: var(--sw);
  color: var(--sw-on);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  overflow: hidden;
  white-space: nowrap;
}
button.sb-scale__chip { cursor: pointer; }
button.sb-scale__chip:hover { box-shadow: inset 0 -3px 0 var(--sw-on); }
button.sb-scale__chip:focus-visible { outline-offset: -3px; outline-color: var(--sw-on); }
.sb-scale__chip[aria-pressed="true"] { box-shadow: inset 0 -4px 0 var(--sw-on); }
.sb-scale--compact .sb-scale__chip { height: 28px; }

/* hue wheel */
.sb-wheel {
  position: relative;
  width: var(--wheel-size, 240px);
  max-width: 100%;
  aspect-ratio: 1;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  cursor: crosshair;
  flex: none;
}
.sb-wheel canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.sb-wheel__handle, .sb-wheel__marker, .sb-wheel__marker-label {
  position: absolute;
  transform: translate(-50%, -50%);
}
.sb-wheel__handle {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 3px solid var(--surface);
  background: var(--sw);
  box-shadow: 0 0 0 2px var(--ink);
  cursor: grab;
  z-index: 2;
}
.sb-wheel__handle:active { cursor: grabbing; }
.sb-wheel__handle:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 50%; }
.sb-wheel__marker {
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 2px solid var(--surface);
  background: var(--sw);
  box-shadow: 0 0 0 1px var(--ink);
  pointer-events: none;
  z-index: 1;
}
.sb-wheel__marker-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--ink-2);
  white-space: nowrap;
  pointer-events: none;
}
.sb-wheel__center {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  display: grid; justify-items: center; gap: 2px;
  pointer-events: none;
  text-align: center;
}
.sb-wheel__readout { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: 1.375rem; font-weight: 600; letter-spacing: -0.03em; line-height: 1; }

/* segmented */
.sb-seg-wrap { display: inline-grid; gap: 6px; min-width: 0; max-width: 100%; justify-items: start; }
.sb-seg {
  display: inline-flex;
  flex-wrap: wrap;
  max-width: 100%;
  padding: 2px;
  gap: 2px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}
.sb-seg__btn {
  min-height: 30px;
  padding: 4px 12px;
  border: 1px solid transparent;
  border-radius: 3px;
  background: transparent;
  color: var(--ink-2);
  font-size: var(--fs-sm);
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
}
.sb-seg__btn:hover { color: var(--ink); }
.sb-seg__btn[aria-checked="true"] {
  background: var(--surface);
  border-color: var(--line-strong);
  color: var(--ink);
  font-weight: 600;
}

/* toggle */
.sb-toggle {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 4px 0;
  border: 0;
  background: transparent;
  font-size: 0.9375rem;
  font-weight: 500;
  text-align: left;
}
.sb-toggle__track {
  position: relative;
  width: 38px; height: 22px; flex: none;
  border-radius: 11px;
  border: 1px solid var(--line-strong);
  background: var(--surface-2);
  transition: background-color 0.15s, border-color 0.15s;
}
.sb-toggle__thumb {
  position: absolute; top: 3px; left: 3px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--ink-2);
  transition: transform 0.15s, background-color 0.15s;
}
.sb-toggle[aria-checked="true"] .sb-toggle__track { background: var(--accent); border-color: var(--accent); }
.sb-toggle[aria-checked="true"] .sb-toggle__thumb { transform: translateX(16px); background: var(--on-accent); }
.sb-toggle__state { font-family: var(--font-mono); font-size: var(--fs-micro); color: var(--ink-2); letter-spacing: 0.06em; text-transform: uppercase; min-width: 3ch; }

/* compare */
.sb-compare { display: grid; gap: var(--s4); min-width: 0; }
.sb-compare__panes { display: grid; gap: var(--s4); min-width: 0; }
.sb-compare--side .sb-compare__panes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.sb-compare--flip .sb-compare__panes { grid-template-columns: minmax(0, 1fr); }
.sb-compare--flip .sb-compare__pane { grid-area: 1 / 1; }
.sb-compare--flip .sb-compare__pane.is-off { visibility: hidden; }
.sb-compare--flip .sb-compare__label { display: none; }
.sb-compare__pane { display: flex; flex-direction: column; gap: var(--s2); min-width: 0; margin: 0; }
.sb-compare__label { display: flex; align-items: center; gap: 6px; }
.sb-compare__label::before { content: ""; width: 14px; height: 1px; background: var(--line-strong); }
.sb-compare__content { min-width: 0; flex: 1 1 auto; }
.sb-compare__notes {
  display: grid; gap: var(--s2);
  padding: var(--s3) var(--s4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.sb-compare__notes ul { display: grid; gap: 4px; }
.sb-compare__notes li { display: grid; grid-template-columns: 16px minmax(0, 1fr); gap: var(--s2); font-size: 0.9375rem; line-height: 1.4; }
.sb-compare__notes li .icon { margin-top: 4px; color: var(--ink-2); font-size: 0.8125rem; }
@media (max-width: 720px) {
  .sb-compare--side .sb-compare__panes { grid-template-columns: minmax(0, 1fr); }
}

/* quiz */
.sb-quiz { display: grid; gap: var(--s4); min-width: 0; }
.sb-quiz__q { font-size: var(--fs-md); font-weight: 600; line-height: 1.3; }
.sb-quiz__options { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 170px), 1fr)); gap: var(--s3); }
.sb-quiz__opt {
  position: relative;
  display: flex; flex-direction: column; align-items: stretch; justify-content: center; gap: var(--s2);
  min-height: 48px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.3;
  text-align: left;
  min-width: 0;
  transition: border-color 0.12s, background-color 0.12s;
}
.sb-quiz__opt:hover:not([disabled]) { background: var(--surface-2); }
.sb-quiz__opt[disabled] { cursor: default; }
.sb-quiz__mark {
  display: none;
  align-items: center; gap: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.sb-quiz__opt.is-correct, .sb-quiz__opt.is-wrong { padding: 9px 13px; border-width: 2px; }
.sb-quiz__opt.is-correct { border-color: var(--good); }
.sb-quiz__opt.is-wrong { border-color: var(--bad); border-style: dashed; }
.sb-quiz__opt.is-correct .sb-quiz__mark, .sb-quiz__opt.is-wrong .sb-quiz__mark { display: inline-flex; }
.sb-quiz__opt.is-correct .sb-quiz__mark .icon { color: var(--good); font-size: 0.875rem; }
.sb-quiz__opt.is-wrong .sb-quiz__mark .icon { color: var(--bad); font-size: 0.875rem; }
.sb-quiz.is-locked .sb-quiz__opt:not(.is-correct) { opacity: 0.55; }
.sb-quiz__opt.is-shaking { animation: sb-shake 0.3s ease; }
.sb-quiz__feedback {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--s2);
  padding: var(--s3) var(--s4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 0.9375rem;
  line-height: 1.4;
}
.sb-quiz__feedback:empty { display: none; }
.sb-quiz__feedback .icon { margin-top: 3px; font-size: 1rem; }
.sb-quiz__feedback.is-good .icon { color: var(--good); }
.sb-quiz__feedback.is-bad .icon { color: var(--bad); }
@keyframes sb-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* challenge */
.sb-challenge {
  display: grid;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
}
.sb-challenge__banner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--s3);
  padding: var(--s3) var(--s4);
  border-bottom: 1px solid var(--line);
}
.sb-challenge__icon {
  display: grid; place-items: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 1rem;
}
.sb-challenge__goal { font-weight: 600; line-height: 1.3; }
.sb-challenge__hint {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--s2);
  padding: var(--s3) var(--s4);
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
  font-size: 0.9375rem;
  max-width: none;
}
.sb-challenge__hint .icon { margin-top: 4px; color: var(--ink-2); }
.sb-challenge__body { display: flex; flex-direction: column; gap: var(--s5); padding: var(--s5) var(--s4); min-width: 0; }
.sb-challenge__body:empty { display: none; }
.sb-challenge__foot {
  display: grid;
  grid-template-columns: minmax(80px, 200px) minmax(0, 1fr);
  align-items: center;
  gap: var(--s4);
  padding: var(--s3) var(--s4);
  border-top: 1px solid var(--line);
}
.sb-challenge__foot .meter { height: 6px; border-radius: 3px; }
/* phones: the meter sits on its own line so the status text gets the full width */
@media (max-width: 560px) {
  .sb-challenge__foot { grid-template-columns: minmax(0, 1fr); gap: var(--s2); }
}
.sb-challenge__status { font-size: var(--fs-sm); color: var(--ink); max-width: none; }
.sb-challenge.is-passed { border-color: var(--good); }
.sb-challenge.is-passed .sb-challenge__icon { background: var(--good); border-color: var(--good); color: var(--surface); }
.sb-challenge.is-passed .meter > span { background: var(--good); }
.sb-challenge.is-passed .sb-challenge__status { font-weight: 600; }

/* contrast badge */
.sb-contrast {
  display: inline-flex; align-items: stretch;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-size: var(--fs-sm);
  line-height: 1.2;
  overflow: hidden;
  white-space: nowrap;
  vertical-align: middle;
}
.sb-contrast__ratio { padding: 4px 8px; font-weight: 600; }
.sb-contrast__level {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 8px 4px 6px;
  border-left: 1px solid var(--line-strong);
  font-weight: 600;
}
.sb-contrast__level .icon { font-size: 0.875rem; }
.sb-contrast--pass .sb-contrast__level .icon { color: var(--good); }
.sb-contrast--large .sb-contrast__level .icon { color: var(--warn); }
.sb-contrast--fail .sb-contrast__level .icon { color: var(--bad); }
.sb-contrast--fail .sb-contrast__level { background: var(--surface-2); }

/* code block */
.sb-code {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  min-width: 0;
}
.sb-code__bar {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s2);
  padding: 4px 6px 4px 6px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
}
.sb-code__tabs { display: flex; flex-wrap: wrap; gap: 2px; min-width: 0; }
.sb-code__tab {
  padding: 5px 10px;
  border: 1px solid transparent;
  border-radius: 3px;
  background: transparent;
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
}
.sb-code__tab:hover { color: var(--ink); }
.sb-code__tab[aria-selected="true"] { background: var(--surface); border-color: var(--line-strong); color: var(--ink); font-weight: 600; }
.sb-code__tab--static { cursor: default; }
.sb-code pre {
  margin: 0;
  padding: var(--s4);
  overflow: auto;
  max-height: 420px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-variant-ligatures: none;
  line-height: 1.6;
  tab-size: 2;
  color: var(--ink);
  white-space: pre;
  overflow-wrap: normal;
}
.sb-code pre:focus-visible { outline-offset: -2px; }
.sb-code .tok-c { color: var(--ink-2); font-style: italic; }
.sb-code .tok-p { color: var(--accent); }
.sb-code .tok-hex i {
  display: inline-block;
  width: 0.72em; height: 0.72em;
  margin-right: 0.35em;
  border-radius: 2px;
  box-shadow: 0 0 0 1px var(--line-strong);
  vertical-align: -0.02em;
}

/* glossary term */
.sb-term { position: relative; display: inline; }
.sb-term__btn {
  display: inline;
  padding: 0; margin: 0;
  border: 0;
  background: transparent;
  font: inherit;
  color: inherit;
  text-decoration: underline dotted var(--ink-2);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.22em;
  cursor: help;
}
.sb-term__btn:hover, .sb-term.is-open .sb-term__btn { text-decoration-color: var(--accent); }
.sb-term__pop {
  display: none;
  position: absolute;
  top: calc(100% + 6px); left: 0;
  z-index: 40;
  width: max-content;
  max-width: min(280px, calc(100vw - 32px));
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-float);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 400;
  font-style: normal;
  letter-spacing: 0;
  line-height: 1.45;
  text-transform: none;
  text-align: left;
  white-space: normal;
}
.sb-term.is-open .sb-term__pop { display: block; }
.sb-term__pop strong { display: block; font-weight: 600; margin-bottom: 2px; }

/* toast */
.sb-toasts {
  position: fixed;
  left: 50%; bottom: max(24px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 90;
  display: grid; justify-items: center; gap: var(--s2);
  width: max-content;
  max-width: calc(100vw - 32px);
  pointer-events: none;
}
.sb-toast {
  display: inline-flex; align-items: center; gap: var(--s2);
  padding: 10px 14px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--bg);
  box-shadow: var(--shadow-float);
  font-size: 0.875rem;
  font-weight: 500;
  animation: sb-toast-in 0.18s ease;
}
.sb-toast.is-leaving { opacity: 0; transition: opacity 0.2s; }
@keyframes sb-toast-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* ---- 9. Motion ---------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  a.chip-card:hover { transform: none; }
  .btn:active { transform: none; }
}

@media print {
  .rail, .topbar, .lesson-foot, .sb-toasts { display: none !important; }
  .app { display: block; }
}