:root {
  color-scheme: light;
  --color-canvas: #F8F6FF;
  --color-surface: #FFFFFF;
  --color-surface-raised: #EEEAFA;
  --color-ink: #171126;
  --color-text-supporting: #554C6A;
  --color-text-quiet: #675D7A;
  --color-purple: #7844FF;
  --color-on-action: #FFFFFF;
  --color-violet: #6634D1;
  --color-blue: #315DFF;
  --color-border: #DCD4EE;
  --color-control-border: #82769B;
  --color-focus: #5B2ACF;
  --layer-content: 1;
  --layer-header: 20;
  --layer-menu: 30;
  --layer-skip-link: 40;
  --container: 1180px;
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --color-canvas: #050914;
  --color-surface: #0B1324;
  --color-surface-raised: #111C31;
  --color-ink: #F7F8FC;
  --color-text-supporting: #AAB2C2;
  --color-text-quiet: #8792A7;
  --color-purple: #7844FF;
  --color-on-action: #F7F8FC;
  --color-violet: #B18AFF;
  --color-blue: #315DFF;
  --color-border: #26334B;
  --color-control-border: #5C6E8D;
  --color-focus: #F1E9FF;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }

a:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.theme-toggle {
  min-width: 44px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--color-control-border);
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: var(--color-surface);
  color: var(--color-ink);
  font: inherit;
  font-size: 13px;
  font-weight: 680;
  cursor: pointer;
}

.theme-toggle:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.theme-toggle-icon {
  font-size: 17px;
  line-height: 1;
}

.theme-transition,
.theme-transition * {
  transition-property: color, background-color, border-color, box-shadow, fill, stroke;
  transition-duration: 180ms;
  transition-timing-function: ease;
}

.container { width: min(calc(100% - 40px), var(--container)); margin: auto; }

.brand-header {
  position: sticky;
  top: 0;
  z-index: var(--layer-header);
  height: 84px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.header-row { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.header-actions { display: flex; align-items: center; gap: 12px; }

.brand { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-size: 20px; font-weight: 780; }
.brand img { width: 40px; }
.brand-mark { display: inline-grid; width: 40px; height: 40px; flex: none; align-items: center; }
.brand-mark img { grid-area: 1 / 1; width: 100%; height: 100%; }
.brand-mark-dark { display: none; }
:root[data-theme="dark"] .brand-mark-light { display: none; }
:root[data-theme="dark"] .brand-mark-dark { display: block; }

.back-link,
footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-text-supporting);
  font-size: 14px;
}

.back-link:hover,
footer a:hover { color: var(--color-ink); }

.brand-hero { padding: clamp(72px, 10vw, 112px) 0 clamp(64px, 8vw, 90px); }
.eyebrow { margin: 0 0 12px; color: var(--color-violet); font-size: 11px; font-weight: 780; letter-spacing: .1em; text-transform: uppercase; }

.brand-hero h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3.125rem, 7vw, 4.75rem);
  line-height: 1.07;
  letter-spacing: -.035em;
}

.brand-hero > div > p:last-child {
  max-width: 68ch;
  margin: 25px 0 0;
  color: var(--color-text-supporting);
  font-size: 18px;
  line-height: 1.8;
}

.section { padding: clamp(68px, 8vw, 90px) 0; border-top: 1px solid var(--color-border); }
.subtle-section { background: var(--color-surface); }

.section-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: end; margin-bottom: 38px; }
.section-heading h2,
.two-column h2 { margin: 0; font-size: clamp(2.25rem, 4vw, 3.25rem); line-height: 1.13; letter-spacing: -.03em; }
.section-heading > p { max-width: 65ch; margin: 0; color: var(--color-text-supporting); }

.logo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.logo-card { overflow: hidden; border: 1px solid var(--color-border); border-radius: 12px; background: var(--color-surface); }
.logo-card-wide { grid-column: 1 / -1; }
.asset-preview { display: grid; min-height: 260px; place-items: center; padding: 46px; }
.logo-card-wide .asset-preview { min-height: 300px; }
.asset-preview > img { max-width: min(100%, 700px); max-height: 180px; }
.mark-preview > img { width: 130px; height: 130px; }
.mark-preview .icon-tile { width: 128px; height: 128px; }
.dark-card .asset-preview { background: #050914; }
.purple-card .asset-preview { background: #7844FF; }
.light-card .asset-preview { background: #F7F8FC; }

.asset-meta { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 21px 23px; border-top: 1px solid var(--color-border); }
.asset-meta small { color: var(--color-violet); font-size: 11px; font-weight: 760; letter-spacing: .08em; text-transform: uppercase; }
.asset-meta h3 { margin: 2px 0 0; font-size: 18px; line-height: 1.35; letter-spacing: -.02em; }
.download-row { display: flex; gap: 8px; }
.download-row a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 7px 10px; border: 1px solid var(--color-border); border-radius: 7px; color: var(--color-text-supporting); font-size: 12px; font-weight: 700; }
.download-row a:hover { border-color: var(--color-violet); background: var(--color-surface-raised); color: var(--color-ink); }

.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; }
.swatches { display: grid; gap: 10px; margin: 30px 0 0; padding: 0; list-style: none; }
.swatches > li { display: grid; grid-template-columns: 56px 1fr; align-items: center; gap: 14px; padding: 10px; border: 1px solid var(--color-border); border-radius: 12px; background: var(--color-canvas); }
.swatches i { width: 56px; height: 56px; border: 1px solid var(--color-border); border-radius: 9px; }
.swatch-midnight { background: #050914; }
.swatch-night-surface { background: #0B1324; }
.swatch-raised-navy { background: #111C31; }
.swatch-cloud-white { background: #F7F8FC; }
.swatch-slate-mist { background: #AAB2C2; }
.swatch-quiet-steel { background: #8792A7; }
.swatch-switch-purple { background: #7844FF; }
.swatch-violet-signal { background: #B18AFF; }
.swatch-electric-blue { background: #315DFF; }
.swatch-structural-border { background: #26334B; }
.swatch-control-border { background: #5C6E8D; }
.swatch-focus-lilac { background: #F1E9FF; }
.swatches span { display: grid; }
.swatches strong { font-size: 14px; }
.swatches code { color: var(--color-text-quiet); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }

.guidelines { margin-top: 30px; }
.guidelines article { display: grid; grid-template-columns: 40px 1fr; gap: 16px; padding: 19px 0; border-top: 1px solid var(--color-border); }
.guidelines article:last-child { border-bottom: 1px solid var(--color-border); }
.guidelines > article > span { color: var(--color-violet); font-size: 12px; font-weight: 780; }
.guidelines h3 { margin: 0; font-size: 17px; line-height: 1.35; letter-spacing: -.02em; }
.guidelines p { max-width: 65ch; margin: 5px 0 0; color: var(--color-text-supporting); font-size: 14px; }

.reference-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; }
.reference-grid a { overflow: hidden; border: 1px solid var(--color-border); border-radius: 12px; background: var(--color-surface); transition: transform 200ms ease, border-color 200ms ease, background-color 200ms ease; }
.reference-grid a:hover { transform: translateY(-3px); border-color: var(--color-violet); background: var(--color-surface-raised); }
.reference-grid img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top; }
.reference-grid a:last-child img { aspect-ratio: 4 / 3; object-position: center; }
.reference-grid span { display: block; padding: 17px 19px; color: var(--color-text-supporting); font-size: 14px; }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

footer { padding: 20px 0; border-top: 1px solid var(--color-border); background: var(--color-canvas); }
footer > div { display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--color-text-quiet); font-size: 12px; }
footer a { color: var(--color-violet); font-size: 12px; }
footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
}

@media (max-width: 800px) {
  .section-heading,
  .two-column { grid-template-columns: 1fr; gap: 24px; }
  .logo-grid { grid-template-columns: 1fr; }
  .logo-card-wide { grid-column: auto; }
  .reference-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .header-row { gap: 12px; }
  .header-actions { gap: 8px; }
  .back-link { max-width: 88px; text-align: right; }
  footer nav {
    flex-direction: column;
    gap: 0;
  }
  .asset-preview,
  .logo-card-wide .asset-preview { min-height: 220px; padding: 30px; }
  .asset-meta { align-items: flex-start; flex-direction: column; }
  footer > div { align-items: flex-start; flex-direction: column; gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .theme-transition,
  .theme-transition * { transition: none !important; }
}