/* Styling for the Roma docs site itself (not part of the system). */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--color-bg-page);
  color: var(--color-text-primary);
  font: var(--text-body-m);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--color-text-link); }
code, pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.8125rem; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: var(--space-16); top: var(--space-16); z-index: 10; background: var(--color-bg-surface); padding: var(--space-8); }

/* ---------- shell: top bar + sidebar, after Carbon ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: var(--space-12);
  height: 48px; padding: 0 var(--space-16);
  background: var(--color-bg-page);
  border-bottom: var(--border-width-2) solid var(--color-border-default);
}
.brand { display: flex; align-items: center; gap: var(--space-12); color: var(--color-text-primary); text-decoration: none; font: var(--text-body-s); }
.brand b { font-weight: 700; }
.mark { width: 22px; height: 22px; color: var(--color-bg-accent); flex: none; }
.theme-toggle {
  margin-left: auto; height: 32px; padding: 0 var(--space-12);
  border: var(--border-width-1) solid var(--color-border-default); border-radius: var(--radius-none);
  background: transparent; color: var(--color-text-primary); font: var(--text-label-s); cursor: pointer; white-space: nowrap;
}
.nav-toggle { display: none; width: 32px; height: 32px; padding: 0; border: 0; background: transparent; color: var(--color-text-primary); cursor: pointer; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { display: block; width: 18px; height: 2px; margin: 0 auto; background: currentColor; position: relative; content: ""; }
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

.shell { display: grid; grid-template-columns: 264px minmax(0, 1fr); min-height: calc(100vh - 48px); }

.sidenav {
  position: sticky; top: 48px; align-self: start;
  display: flex; flex-direction: column;
  height: calc(100vh - 48px); overflow-y: auto;
  background: var(--color-bg-page);
  border-right: var(--border-width-1) solid var(--color-border-subtle);
}
.find {
  display: flex; align-items: center; gap: var(--space-8);
  margin: 0 var(--space-16) var(--space-12); padding: 0 var(--space-12);
  height: 40px; background: var(--color-bg-muted);
  border-bottom: var(--border-width-1) solid var(--color-border-default);
}
.find svg { width: 16px; height: 16px; flex: none; color: var(--color-text-secondary); }
.find input { flex: 1; min-width: 0; height: 100%; border: 0; background: transparent; color: var(--color-text-primary); font: var(--text-body-s); outline: none; }
.find:focus-within { box-shadow: 0 0 0 var(--border-width-2) var(--color-border-focus); }
.find-results { margin: 0 0 var(--space-12); }
.find-results a { display: block; padding: var(--space-8) var(--space-16); color: var(--color-text-primary); text-decoration: none; font: var(--text-body-s); }
.find-results a:hover, .find-results a:focus-visible { background: var(--color-bg-muted); }
.find-results small { display: block; color: var(--color-text-muted); font: var(--text-caption); }
.find-results p { margin: 0; padding: var(--space-8) var(--space-16); font: var(--text-body-s); color: var(--color-text-secondary); }

.nav { display: flex; flex-direction: column; }
.nav-sec summary {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px var(--space-16); cursor: pointer; list-style: none;
  font: var(--text-label-m); color: var(--color-text-primary);
}
.nav-sec summary::-webkit-details-marker { display: none; }
.nav-sec summary::after {
  content: ""; width: 7px; height: 7px; margin-right: 4px;
  border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg); transition: transform 120ms ease;
}
.nav-sec[open] > summary::after { transform: translateY(2px) rotate(-135deg); }
.nav-sec summary:hover, .nav-link:hover { background: var(--color-bg-muted); }
.nav-sec--1 > summary { padding-left: var(--space-24); font: var(--text-body-s); }
.nav-sec--1[open] > summary { font-weight: 700; }
.nav-link {
  display: block; padding: 8px var(--space-16) 8px var(--space-24);
  color: var(--color-text-secondary); text-decoration: none; font: var(--text-body-s);
}
.nav-sec--1 .nav-link { padding-left: 36px; }
.nav-link[aria-current="page"] {
  background: var(--color-bg-muted); color: var(--color-text-primary); font-weight: 700;
  box-shadow: inset 3px 0 0 var(--color-bg-accent);
}
.nav-foot { margin-top: auto; padding: var(--space-16) 0; border-top: var(--border-width-1) solid var(--color-border-subtle); }
.nav-foot a { display: flex; justify-content: space-between; padding: 8px var(--space-16); color: var(--color-text-primary); text-decoration: none; font: var(--text-label-m); }
.nav-foot a:hover { background: var(--color-bg-muted); }
.nav-foot span { color: var(--color-text-muted); }

/* collapsible sidebar (desktop): a thin rail with a grip until opened */
.side-inner { display: flex; flex-direction: column; flex: 1; min-height: 0; overflow-y: auto; padding-top: var(--space-16); }
.side-grip { display: none; }
@media (min-width: 861px) {
  .shell { grid-template-columns: 24px minmax(0, 1fr); transition: grid-template-columns 180ms ease; }
  html.side-open .shell { grid-template-columns: 264px minmax(0, 1fr); }
  .sidenav { padding-top: 0; overflow: hidden; }
  html:not(.side-open) .side-inner { visibility: hidden; }
  .side-grip {
    display: grid; place-items: center;
    position: absolute; top: 0; right: 0; bottom: 0; width: 24px; padding: 0;
    border: 0; background: transparent; cursor: pointer; color: var(--color-border-subtle);
  }
  .side-grip span { width: 4px; height: 48px; border-radius: var(--radius-full); background: currentColor; transition: background 120ms ease, height 120ms ease; }
  .side-grip:hover, .side-grip:focus-visible { color: var(--color-bg-accent); }
  .side-grip:hover span { height: 64px; }
  html:not(.side-open) .side-grip { color: var(--color-text-muted); }
  html.side-open .side-grip { width: 12px; }
}
@media (min-width: 861px) and (prefers-reduced-motion: reduce) { .shell { transition: none; } }

/* ---------- page ---------- */
.main { min-width: 0; display: flex; flex-direction: column; }
.page-head {
  padding: var(--space-64) var(--space-48) var(--space-48);
  background: var(--color-bg-surface);
  border-bottom: var(--border-width-1) solid var(--color-border-subtle);
}
.eyebrow { margin: 0 0 var(--space-12); font: var(--text-label-s); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.page-head h1 { margin: 0; font: 900 clamp(2.5rem, 5vw, 4rem)/1.02 var(--font-display); letter-spacing: -0.02em; }
.updated { margin: var(--space-12) 0 0; font: var(--text-body-s); color: var(--color-text-secondary); }
.page-head .lede { margin: var(--space-32) 0 0; max-width: 60ch; font: var(--text-reading-l); }

.page-body { display: grid; grid-template-columns: minmax(0, 1fr) 200px; gap: var(--space-48); padding: 0 var(--space-48); }
.content { min-width: 0; padding-bottom: var(--space-48); }
.toc { position: sticky; top: 80px; align-self: start; margin-top: var(--space-64); border-left: var(--border-width-1) solid var(--color-border-subtle); }
.toc-title { margin: 0 0 var(--space-8); padding-left: var(--space-16); font: var(--text-label-s); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.toc a { display: block; padding: 6px var(--space-16); color: var(--color-text-secondary); text-decoration: none; font: var(--text-body-s); }
.toc a:hover { color: var(--color-text-primary); }
.toc a.is-active { color: var(--color-text-primary); font-weight: 700; box-shadow: -1px 0 0 0 var(--color-bg-accent), inset 2px 0 0 var(--color-bg-accent); }

.to-top {
  position: fixed; right: var(--space-24); bottom: var(--space-24); z-index: 20;
  display: grid; place-items: center; width: 48px; height: 48px;
  border-radius: var(--radius-full); background: var(--color-bg-inverse); color: var(--color-text-inverse);
  opacity: 0; pointer-events: none; transition: opacity 150ms ease;
}
.to-top svg { width: 18px; height: 18px; }
.to-top.is-visible { opacity: 1; pointer-events: auto; }

/* content */
.content > h2:first-child { margin-top: var(--space-48); }
.lede { font: var(--text-reading-m); max-width: 62ch; margin: 0 0 var(--space-48); color: var(--color-text-primary); }
.main h2 {
  font: var(--text-heading-m);
  margin: var(--space-64) 0 var(--space-16);
  padding-top: var(--space-12);
  border-top: var(--border-width-1) solid var(--color-border-default);
  scroll-margin-top: 64px;
}
.main h3 { font: var(--text-label-m); margin: var(--space-24) 0 var(--space-8); }
.main p, .main li { max-width: 68ch; }
.main ul { padding-left: 1.2em; }
.note { color: var(--color-text-secondary); font: var(--text-body-s); }

.stage {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-16);
  padding: var(--space-32);
  background: var(--color-bg-surface);
  border: var(--border-width-1) solid var(--color-border-subtle);
}
.stage--col { flex-direction: column; align-items: stretch; }
.stage + pre { margin-top: 0; border-top: 0; }
pre {
  margin: 0 0 var(--space-24);
  padding: var(--space-16);
  overflow-x: auto;
  background: var(--color-bg-muted);
  border: var(--border-width-1) solid var(--color-border-subtle);
  line-height: 1.5;
}
:not(pre) > code { padding: 1px 4px; background: var(--color-bg-muted); }

.split { display: grid; grid-template-columns: 1fr 1fr; }
.split > [data-theme] { background: var(--color-bg-page); color: var(--color-text-primary); padding: var(--space-32); display: flex; flex-wrap: wrap; gap: var(--space-16); align-items: center; }
.split-label { flex-basis: 100%; font: var(--text-label-s); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.06em; }

/* state matrix */
.matrix { width: 100%; border-collapse: collapse; background: var(--color-bg-surface); border: var(--border-width-1) solid var(--color-border-subtle); }
.matrix-wrap { overflow-x: auto; margin-bottom: var(--space-24); }
.matrix th { font: var(--text-label-s); color: var(--color-text-secondary); text-align: left; padding: var(--space-12) var(--space-16); white-space: nowrap; }
.matrix td { padding: var(--space-12) var(--space-16); }
.matrix tr + tr th, .matrix tr + tr td { border-top: var(--border-width-1) solid var(--color-bg-muted); }

/* do / don't */
.rules { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-16); margin: var(--space-16) 0 var(--space-24); }
.rule { padding: var(--space-16) var(--space-24); border-top: 4px solid; background: var(--color-bg-surface); }
.rule--do { border-color: var(--color-feedback-success-fg); }
.rule--dont { border-color: var(--color-feedback-danger-fg); }
.rule b { display: block; font: var(--text-label-m); margin-bottom: var(--space-4); }
.rule p { margin: 0; font: var(--text-body-s); }

/* color */
.swatch-row h3 { text-transform: capitalize; }
.swatches { display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: var(--space-8); }
.swatch { margin: 0; }
.swatch-color { display: block; height: 64px; box-shadow: inset 0 0 0 1px var(--color-border-subtle); }
.swatch figcaption { display: grid; padding-top: var(--space-4); font: var(--text-caption); }
.swatch figcaption b { font: var(--text-label-s); }
.hex { color: var(--color-text-secondary); font-family: ui-monospace, Menlo, monospace; font-size: 0.75rem; }
.roles { width: 100%; border-collapse: collapse; margin-bottom: var(--space-24); }
.roles th { font: var(--text-label-s); color: var(--color-text-secondary); text-align: left; padding: var(--space-8) var(--space-12); }
.roles td { padding: var(--space-12); vertical-align: middle; border-top: var(--border-width-1) solid var(--color-border-subtle); }
.roles td:first-child { width: 50%; }
.roles td[data-theme] { background: var(--color-bg-page); color: var(--color-text-primary); white-space: nowrap; }
.role-desc { display: block; margin-top: 2px; font: var(--text-body-s); color: var(--color-text-secondary); }
.chip { display: inline-block; width: 40px; height: 24px; vertical-align: middle; margin-right: var(--space-8); background: var(--c); box-shadow: inset 0 0 0 1px var(--color-border-subtle); }
.ref { font: var(--text-caption); color: var(--color-text-secondary); }
.contrast { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--space-8); }
.contrast-cell { display: flex; justify-content: space-between; align-items: baseline; padding: var(--space-16); font: var(--text-body-s); }
.contrast-cell b { font: var(--text-heading-s); }

/* type + scale */
.type-row { display: grid; grid-template-columns: 240px 1fr; gap: var(--space-24); padding: var(--space-16) 0; border-top: var(--border-width-1) solid var(--color-border-subtle); align-items: baseline; }
.type-row p { margin: 0; max-width: 34em; }
.type-meta { display: grid; gap: 2px; font: var(--text-caption); color: var(--color-text-secondary); }
.scale-row { display: grid; grid-template-columns: 200px 48px 1fr; align-items: center; gap: var(--space-16); padding: var(--space-8) 0; border-top: var(--border-width-1) solid var(--color-border-subtle); }
.scale-val { font: var(--text-caption); color: var(--color-text-secondary); text-align: right; }
.scale-bar { display: block; height: 12px; width: var(--v); max-width: 100%; background: var(--color-bg-accent); }
.radius-demo { display: flex; flex-wrap: wrap; gap: var(--space-24); }
.radius-demo figure { margin: 0; display: grid; gap: var(--space-8); font: var(--text-caption); }
.radius-demo span { width: 80px; height: 80px; border: var(--border-width-1) solid var(--color-border-default); background: var(--color-bg-surface); }

/* overview */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--space-16); margin: var(--space-24) 0; }
.card { display: block; padding: var(--space-24); background: var(--color-bg-surface); border: var(--border-width-1) solid var(--color-border-subtle); color: var(--color-text-primary); text-decoration: none; }
.card:hover { border-color: var(--color-border-default); }
.card b { display: block; font: var(--text-heading-s); margin-bottom: var(--space-8); }
.card span { font: var(--text-body-s); color: var(--color-text-secondary); }
.principles { counter-reset: p; list-style: none; padding: 0; display: grid; gap: var(--space-16); }
.principles li { counter-increment: p; display: grid; grid-template-columns: 48px 1fr; gap: var(--space-16); }
.principles li::before { content: counter(p); display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--color-bg-accent); color: var(--color-text-on-accent); font: var(--text-heading-s); }
.principles b { display: block; }

.foot { display: flex; flex-wrap: wrap; gap: var(--space-24); margin: auto var(--space-48) 0; padding: var(--space-12) 72px var(--space-32) 0; border-top: var(--border-width-2) solid var(--color-border-default); font: var(--text-label-s); }
.foot a { margin-left: auto; color: inherit; }

/* small screens */
@media (max-width: 1100px) {
  .page-body { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidenav {
    position: fixed; top: 48px; left: 0; z-index: 25; width: min(300px, 85vw);
    transform: translateX(-100%); transition: transform 180ms ease;
    box-shadow: 4px 0 0 rgba(0,0,0,.06);
  }
  .sidenav.is-open { transform: none; }
  .brand span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .page-head { padding: var(--space-32) var(--space-16) var(--space-24); }
  .page-body { padding: 0 var(--space-16); }
  .foot { margin: auto var(--space-16) 0; }
  .split, .rules { grid-template-columns: 1fr; }
  .type-row, .scale-row { grid-template-columns: 1fr; gap: var(--space-4); }
  .scale-val { text-align: left; }
  .roles td:first-child { width: auto; }
  .stage { padding: var(--space-16); }
}

/* ---------- brand pages ---------- */
.draft { border-left: 3px solid var(--color-feedback-warning-fg); padding-left: var(--space-12); }
.uses { columns: 2; column-gap: var(--space-32); font: var(--text-label-m); line-height: 1.8; }
.downloads { font: var(--text-body-s); }

/* homepage: book cover, then white space */
.main:has(.home) { background: var(--color-bg-surface); }
.home { padding: var(--space-48); }
.cover {
  display: grid; grid-template-rows: 1fr auto;
  width: min(100%, calc(100vh - 48px - 96px)); aspect-ratio: 1;
  padding: 7%;
  background: var(--color-tomato-500); color: var(--color-neutral-50);
}
.cover-art { display: grid; place-items: center; }
.cover .logo { width: 52%; height: auto; }
.cover-foot {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-8) var(--space-24);
  padding-top: var(--space-12); border-top: var(--border-width-2) solid currentColor;
  font: var(--text-label-s);
}
.home-body { max-width: 960px; padding-top: var(--space-96); }
.home-body h1 { margin: 0; font: 900 clamp(2.75rem, 6vw, 5rem)/1 var(--font-display); letter-spacing: -0.02em; }
.home-body > .lede { margin: var(--space-32) 0 var(--space-16); max-width: 60ch; font: var(--text-reading-l); }
.home-body .updated { margin: 0 0 var(--space-48); }

.logo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-12); margin: var(--space-16) 0 var(--space-24); }
.logo-grid--micro { grid-template-columns: repeat(4, 1fr); }
.logo-tile { position: relative; margin: 0; display: grid; place-items: center; aspect-ratio: 1; padding: 24%; }
.logo-tile--hero { grid-column: 1 / -1; aspect-ratio: 2 / 1; padding: 7% 0; }
.logo-tile .logo { width: 100%; height: 100%; }
.logo-tile figcaption { position: absolute; top: var(--space-12); left: var(--space-12); font: var(--text-label-s); }

.clearspace { position: relative; display: grid; place-items: center; width: min(360px, 100%); aspect-ratio: 1; margin: var(--space-16) 0; background: var(--color-bg-surface); border: var(--border-width-1) solid var(--color-border-subtle); }
.clearspace .logo { width: 40%; height: auto; }
.cs-circle { position: absolute; width: 20%; aspect-ratio: 1; border-radius: 50%; border: 1.5px solid var(--color-tomato-500); }
.cs-top { top: 10%; left: 40%; } .cs-bottom { bottom: 6%; left: 40%; } .cs-left { left: 10%; top: 38%; } .cs-right { right: 10%; top: 38%; }

.brand-swatches { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-12); margin: var(--space-16) 0; }
.brand-swatch { position: relative; display: flex; flex-direction: column; gap: 2px; min-height: 340px; padding: var(--space-24); font: var(--text-label-m); }
.brand-swatches--secondary .brand-swatch { min-height: 240px; }
.brand-swatch b { font: var(--text-heading-m); margin-bottom: var(--space-12); }
.brand-swatch .tbd { opacity: .7; font-weight: 400; }
.pairs { position: absolute; left: var(--space-24); bottom: var(--space-24); display: flex; gap: 6px; }
.pairs i { width: 28px; height: 28px; border-radius: 50%; box-shadow: inset 0 0 0 1px rgba(128,128,128,.4); }

.sliding-scale { display: grid; margin: var(--space-16) 0 var(--space-24); }
.sliding-scale span { height: 48px; }
.sliding-scale span:nth-child(1) { background: linear-gradient(90deg, #FF223C 0%, #FF223C 8%, #232323 38%, #F7F7F7 56%, #BAFF8F 70%, #0075FF 84%, #F8E6D2 100%); }
.sliding-scale span:nth-child(2) { background: linear-gradient(90deg, #FF223C 0%, #232323 22%, #232323 30%, #F7F7F7 48%, #BAFF8F 64%, #0075FF 80%, #F8E6D2 96%); }
.sliding-scale span:nth-child(3) { background: linear-gradient(90deg, #FF223C 10%, #232323 32%, #F7F7F7 50%, #BAFF8F 68%, #0075FF 82%, #F8E6D2 92%); }
.sliding-scale span:nth-child(4) { background: linear-gradient(90deg, #FF223C 18%, #232323 36%, #F7F7F7 52%, #BAFF8F 66%, #0075FF 78%, #F8E6D2 88%); }

.hscale > div { display: grid; grid-template-columns: 140px 1fr; align-items: baseline; gap: var(--space-16); border-top: var(--border-width-1) solid var(--color-border-subtle); padding: var(--space-8) 0; overflow: hidden; }
.hscale p { margin: 0; min-width: 0; overflow: hidden; font-family: var(--font-display); font-weight: 900; line-height: 1.02; letter-spacing: -0.01em; white-space: nowrap; }
.hlabel { font: var(--text-caption); color: var(--color-text-secondary); }

.serif-demo { display: grid; gap: 0; margin: var(--space-16) 0; }
.serif-demo p { margin: 0; padding: var(--space-32); max-width: none; font: var(--text-reading-l); color: var(--color-text-primary); }

.glyph-grid { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); width: 100%; max-width: 640px; border-left: 1px solid var(--color-border-default); border-top: 1px solid var(--color-border-default); margin: var(--space-16) 0; }
.glyph-grid span { display: flex; align-items: center; justify-content: center; white-space: nowrap; aspect-ratio: 1; border-right: 1px solid var(--color-border-default); border-bottom: 1px solid var(--color-border-default); font: 400 clamp(14px, 3vw, 28px)/1 var(--font-reading); font-style: italic; }
.glyph-grid sub { font-size: .5em; }

.stickers { display: flex; flex-wrap: wrap; align-items: center; padding: var(--space-32) var(--space-16); background: var(--color-bg-surface); border: var(--border-width-1) solid var(--color-border-subtle); }
.stickers span { display: grid; place-items: center; width: clamp(52px, 8vw, 96px); aspect-ratio: 1; margin: -4px -8px; border-radius: 50%; background: var(--bg); color: var(--fg); font: 900 clamp(26px, 4.4vw, 52px)/1 var(--font-display); transform: rotate(var(--r)); box-shadow: inset 0 0 0 1px rgba(35,35,35,.25); }
.stickers .gap { width: 32px; background: none; box-shadow: none; margin: 0; }

.rule-demo { padding: var(--space-24); background: var(--color-bg-surface); border: var(--border-width-1) solid var(--color-border-subtle); }
.rd-heavy { height: 2px; background: var(--color-border-default); }
.rd-light { height: 1px; background: var(--color-border-default); }
.rd-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-24); }

/* ---------- component pages ---------- */
.state-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); align-items: start; }
.choice-col { flex-direction: column; align-items: flex-start !important; }

@media (max-width: 860px) {
  .logo-grid, .logo-grid--micro, .brand-swatches { grid-template-columns: 1fr 1fr; }
  .logo-tile--hero { grid-column: 1 / -1; }
  .logo-grid { grid-template-columns: 1fr 1fr 1fr; }
  .roles { display: block; overflow-x: auto; }
  .glyph-grid span { font-size: 13px; }
  .brand-swatch { min-height: 200px; }
  .uses { columns: 1; }
  .hscale > div { grid-template-columns: 1fr; }
  .rd-cols { grid-template-columns: 1fr; }
}

/* ---------- password gate ---------- */
.gate { display: none; }
html.locked body > :not(.gate) { display: none !important; }
html.locked .gate {
  display: grid; gap: var(--space-24); align-content: center;
  width: min(360px, 100% - 32px); min-height: 100vh; margin: 0 auto;
}
.gate-mark { width: 48px; height: 48px; color: var(--color-bg-accent); }
.gate-title { margin: 0; font: var(--text-heading-m); }
.gate .tl-button { justify-self: start; }

/* phones: cover, top bar (kept last so it wins over the rules above) */
@media (max-width: 860px) {
  .home { padding: var(--space-16); }
  .cover { width: 100%; padding: 8%; }
  .cover-foot { flex-direction: column; gap: 2px; }
  .home-body { padding-top: var(--space-64); }
  .brand { min-width: 0; flex: 1; }
  .brand span { min-width: 0; }
  .theme-toggle { margin-left: 0; padding: 0 var(--space-8); }
  .sidenav:not(.is-open) { box-shadow: none; }
}

/* =====================================================================
   12-column grid
   Every page sits on 12 columns with 24px gutters and 48px margins
   (4 columns, 16px gutters and margins on phones). A faint hairline runs
   down the middle of each gutter so the alignment shows.
   Content pages use columns 1–8 for content and 10–12 for "On this page";
   grids inside the content split those 8 columns by 2 or 4.
   ===================================================================== */
:root {
  --grid-cols: 12;
  --grid-gutter: 24px;
  --grid-margin: 48px;
  --grid-line: rgba(35, 35, 35, 0.08);
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --grid-line: rgba(247, 247, 247, 0.08); } }
:root[data-theme="dark"] { --grid-line: rgba(247, 247, 247, 0.08); }

.main { position: relative; }
.main::after {
  /* a 1px line in the middle of every gutter, plus one half a gutter outside each edge */
  content: ""; position: absolute; z-index: 5; pointer-events: none;
  top: 0; bottom: 0;
  left: calc(var(--grid-margin) - var(--grid-gutter) / 2);
  right: calc(var(--grid-margin) - var(--grid-gutter) / 2);
  border-right: 1px solid var(--grid-line);
  background-image: linear-gradient(to right, var(--grid-line) 0, var(--grid-line) 1px, transparent 1px);
  background-size: calc(100% / var(--grid-cols)) 100%;
}

.page-head { padding-left: var(--grid-margin); padding-right: var(--grid-margin); }
.page-body { grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--grid-gutter); padding: 0 var(--grid-margin); }
.content { grid-column: 1 / span 8; }
.toc { grid-column: 10 / span 3; }
.foot { margin-left: var(--grid-margin); margin-right: var(--grid-margin); }

/* homepage: wide cover, then text across 8 columns */
.home { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--grid-gutter); padding: var(--grid-margin); }
.cover {
  grid-column: 1 / -1; width: auto; aspect-ratio: auto;
  height: max(440px, calc(100vh - 48px - 2 * var(--grid-margin)));
  padding: var(--grid-margin) calc((100% - 11 * var(--grid-gutter)) / 12 + var(--grid-gutter));
}
.cover .logo { width: auto; height: min(56vh, 100%); max-width: 100%; }
.cover-art { min-height: 0; }
.home-body { grid-column: 1 / span 8; max-width: none; }

/* grids inside the 8 content columns */
.cards { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--grid-gutter); }
.rules, .split { gap: var(--grid-gutter); }
.contrast { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--grid-gutter); }
.swatches { grid-template-columns: repeat(8, minmax(0, 1fr)); gap: var(--space-16) var(--grid-gutter); }
.state-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--grid-gutter); }
.type-row, .scale-row, .hscale > div { grid-template-columns: repeat(8, minmax(0, 1fr)); column-gap: var(--grid-gutter); }
.type-row > .type-meta, .hscale .hlabel { grid-column: 1 / span 2; }
.type-row > p, .hscale p { grid-column: 3 / -1; }
.scale-row > code { grid-column: 1 / span 2; }
.scale-row > .scale-val { grid-column: 3; text-align: left; }
.scale-row > .scale-bar { grid-column: 4 / -1; }
.logo-grid { grid-template-columns: repeat(8, minmax(0, 1fr)); gap: var(--grid-gutter); }
.logo-tile { grid-column: span 2; aspect-ratio: 1; }
.logo-tile--hero { grid-column: 1 / span 4; grid-row: span 2; aspect-ratio: 1; padding: 18%; }
.brand-swatches { grid-template-columns: repeat(8, minmax(0, 1fr)); gap: var(--grid-gutter); }
.brand-swatch { grid-column: span 2; }
.brand-swatches:not(.brand-swatches--secondary) .brand-swatch:first-child { grid-column: span 4; }

@media (max-width: 1100px) {
  .content { grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  :root { --grid-cols: 4; --grid-gutter: 16px; --grid-margin: 16px; }
  .page-body, .home { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .home-body { grid-column: 1 / -1; }
  .cover { height: auto; min-height: 70vh; padding: var(--space-32) var(--space-24); }
  .cover .logo { height: auto; width: 60%; }
  .cards, .contrast, .state-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .swatches { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .type-row, .scale-row, .hscale > div { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .type-row > .type-meta, .type-row > p, .hscale .hlabel, .hscale p, .scale-row > code { grid-column: 1 / -1; }
  .scale-row > .scale-val { grid-column: 1; }
  .scale-row > .scale-bar { grid-column: 2 / -1; }
  .logo-grid, .brand-swatches { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .logo-tile--hero { grid-column: 1 / -1; grid-row: auto; }
  .brand-swatches:not(.brand-swatches--secondary) .brand-swatch:first-child { grid-column: 1 / -1; }
}

/* motion + playground */
.motion-stage-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--grid-gutter); margin: var(--space-16) 0; }
.motion-stage { display: grid; place-items: center; aspect-ratio: 1; padding: 22%; box-shadow: inset 0 0 0 1px var(--color-border-subtle); }
.motion-stage svg { width: 100%; height: 100%; }
.motion-stage-row + .tl-button { margin-bottom: var(--space-16); }

.playground {
  position: relative; overflow: hidden; height: 560px;
  background: var(--color-bg-surface);
  border: var(--border-width-1) solid var(--color-border-subtle);
  touch-action: pan-y; user-select: none; -webkit-user-select: none;
}
.playground--short { height: 380px; }
.pg-ball {
  position: absolute; left: 0; top: 0;
  display: grid; place-items: center; border-radius: 50%;
  background: var(--bg); color: var(--fg);
  font-family: var(--font-display); font-weight: 900; line-height: 1;
  box-shadow: inset 0 0 0 1px rgba(35, 35, 35, 0.2);
  cursor: grab; touch-action: none; will-change: transform;
}
.pg-ball.is-held { cursor: grabbing; z-index: 2; box-shadow: inset 0 0 0 1px rgba(35, 35, 35, 0.2), 0 8px 0 rgba(35, 35, 35, 0.12); }
.playground-controls { display: flex; flex-wrap: wrap; gap: var(--space-12); margin: var(--space-12) 0 var(--space-24); }
@media (max-width: 860px) {
  .playground { height: 440px; }
  .playground--short { height: 320px; }
}

/* share link next to section headings */
.main h2 { display: flex; align-items: baseline; gap: var(--space-8); }
.h-share {
  position: relative; display: inline-grid; place-items: center; align-self: center;
  width: 28px; height: 28px; flex: none; border-radius: var(--radius-sm);
  color: var(--color-text-muted); opacity: 0; transition: opacity 120ms ease, color 120ms ease;
}
.h-share svg { width: 16px; height: 16px; }
.main h2:hover .h-share, .h-share:focus-visible, .h-share.is-tipped { opacity: 1; }
.h-share:hover { color: var(--color-text-accent); background: var(--color-bg-muted); }
@media (pointer: coarse) { .h-share { opacity: 0.6; } }
.h-share::after {
  content: attr(data-tip); position: absolute; left: 100%; top: 50%; margin-left: var(--space-8);
  transform: translateY(-50%); white-space: nowrap; padding: 4px 8px;
  background: var(--color-bg-inverse); color: var(--color-text-inverse); font: var(--text-label-s);
  opacity: 0; pointer-events: none; transition: opacity 120ms ease;
}
.h-share.is-tipped::after { opacity: 1; }

/* "Edit this page" link under each title */
.edit-link { color: var(--color-text-secondary); text-decoration: underline; text-decoration-color: var(--color-border-subtle, currentColor); text-underline-offset: 3px; }
.edit-link:hover { color: var(--color-text-primary); text-decoration-color: currentColor; }

/* packaging: 3D sample box (assets/package.js turns it) */
.pk-wrap { margin: var(--space-16) 0 var(--space-24); }
.pk-stage {
  --w: 280px; --h: 386px; --d: 8px;
  --paper: #F1F0EC; --ink: var(--color-neutral-900);
  position: relative; display: grid; place-items: center; height: 600px; overflow: hidden;
  background: var(--color-bg-surface); border: var(--border-width-1) solid var(--color-border-subtle);
  perspective: 1500px; cursor: grab; touch-action: none; user-select: none; -webkit-user-select: none;
}
.pk-stage:active { cursor: grabbing; }
.pk-stage:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: -2px; }
.pk-scale { transform-style: preserve-3d; }
.pk-box { position: relative; width: var(--w); height: var(--h); transform-style: preserve-3d; will-change: transform; }
.pk-face {
  position: absolute; left: 0; top: 0; overflow: hidden; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  width: var(--w); height: var(--h); color: var(--ink);
}
.pk-face::after { content: ""; position: absolute; inset: 0; background: #000; opacity: var(--shade, 0); pointer-events: none; z-index: 5; }
.pk-front  { transform: translateZ(calc(var(--d) / 2)); }
.pk-back   { transform: rotateY(180deg) translateZ(calc(var(--d) / 2)); }
/* package.js cuts each sheet into strips along a curve (thin at the edges, full in the middle) */
.pk-sheet { position: absolute; inset: 0; transform-style: preserve-3d; }
.pk-strip { position: absolute; left: 0; top: 0; height: var(--h); overflow: hidden; transform-origin: 0 50%; backface-visibility: hidden; -webkit-backface-visibility: hidden; }
.pk-strip > .pk-face { transform: none; }
.pk-strip::after, .pk-cap::after { content: ""; position: absolute; inset: 0; background: #000; opacity: var(--shade, 0); pointer-events: none; z-index: 5; }
.is-packet .pk-face::after { display: none; }
.pk-cap { position: absolute; left: 0; width: var(--w); backface-visibility: hidden; -webkit-backface-visibility: hidden; }
.pk-face p { margin: 0; max-width: none; }
.pk-face ul, .pk-face ol { margin: 0; padding: 0; list-style: none; }
.pk-face li { max-width: none; }

/* uncoated stock: off-white with fibre specks */
.pk-paper {
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 12% 18%, rgba(35,35,35,.5) 0 .6px, transparent 1px),
    radial-gradient(circle at 64% 41%, rgba(35,35,35,.4) 0 .5px, transparent 1px),
    radial-gradient(circle at 33% 77%, rgba(35,35,35,.45) 0 .6px, transparent 1px),
    radial-gradient(circle at 86% 88%, rgba(35,35,35,.35) 0 .5px, transparent 1px),
    radial-gradient(circle at 48% 8%, rgba(35,35,35,.4) 0 .5px, transparent 1px);
  background-size: 83px 97px, 71px 59px, 109px 89px, 61px 113px, 97px 67px;
}

.pk-front .pk-title { position: absolute; left: 22px; top: 20px; font: 900 46px/0.92 var(--font-display); letter-spacing: -0.035em; }
.pk-square { position: absolute; left: 34px; top: 124px; width: 212px; height: 214px; border: 2px solid var(--ink); }
.pk-art { position: absolute; left: 10px; top: 116px; width: 262px; height: auto; max-width: none; mix-blend-mode: multiply; pointer-events: none; -webkit-user-drag: none; }
.pk-front-foot { position: absolute; left: 22px; right: 22px; bottom: 14px; display: flex; justify-content: space-between; font: 700 7.6px/1 var(--font-text); letter-spacing: -0.01em; }

.pk-back { padding: 41px 22px 12px; display: flex; flex-direction: column; }
.pk-back > * { flex: none; }
.pk-flap { position: absolute; left: 0; top: 0; width: 100%; height: 84px; fill: var(--paper); filter: drop-shadow(0 1.5px 1.5px rgba(35, 35, 35, 0.28)); overflow: visible; }
.pk-seal { position: relative; align-self: center; display: grid; place-items: center; width: 54px; height: 54px; border-radius: 50%; background: var(--color-tomato-500); color: #fff; margin-bottom: 8px; box-shadow: 0 1px 1.5px rgba(35, 35, 35, 0.25); }
.pk-seal .logo { width: 32px; height: auto; }
.pk-section { position: relative; border-top: 4px solid var(--ink); padding: 5px 0 6px; }
.pk-head { font: 700 11px/1.2 var(--font-text); letter-spacing: -0.02em; margin-bottom: 4px !important; }
.pk-list { width: 88%; columns: 2; column-gap: 8px; font: 400 7.2px/1.32 var(--font-text); }
.pk-list li { white-space: nowrap; break-inside: avoid; }
.pk-legend { margin-top: 5px !important; font: italic 400 7.6px/1 var(--font-reading); word-spacing: 2px; }
.pk-stamp { position: absolute; right: -6px; top: 4px; width: 42px; height: 42px; transform: rotate(18deg); font: italic 400 9.5px var(--font-reading); fill: var(--ink); }
.pk-steps { counter-reset: s; font: 400 7.6px/1.3 var(--font-text); }
.pk-steps li { counter-increment: s; position: relative; padding-left: 14px; margin-bottom: 3px; }
.pk-steps li::before {
  content: counter(s); position: absolute; left: 0; top: 0.5px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--ink); color: var(--paper); font: 700 6.5px/9px var(--font-text); text-align: center;
}
.pk-facts { display: grid; grid-template-columns: auto auto 1fr; border: 1.2px solid var(--ink); font: 400 6.8px/1 var(--font-text); }
.pk-facts span { padding: 5px 5px; white-space: nowrap; }
.pk-facts span + span { border-left: 1.2px solid var(--ink); }
.pk-sun { display: flex; align-items: center; justify-content: space-around; gap: 4px; padding: 2px 6px !important; }
.pk-sun svg { width: 10px; height: 10px; }
.pk-url { margin-top: auto !important; align-self: flex-end; font: 700 8px/1 var(--font-text); letter-spacing: -0.01em; }

.pk-floor {
  position: absolute; left: 50%; bottom: 52px; width: 300px; height: 40px; margin-left: -150px;
  border-radius: 50%; background: radial-gradient(closest-side, rgba(35, 35, 35, 0.22), rgba(35, 35, 35, 0));
  pointer-events: none;
}
@media (max-width: 860px) {
  .pk-stage { height: 460px; }
  .pk-scale { transform: scale(0.78); }
  .pk-floor { bottom: 36px; }
}