/*
 * Cyon Brand Guidelines — main stylesheet
 *
 * Layout primitives:
 *   --rail-width       width of the open rail
 *   --rail-collapsed   width of the closed rail (just the burger)
 *   --rail-offset      the value <main> uses for its left padding;
 *                      tracks rail-open / rail-closed body classes
 *
 * Everything else still flows from the tokens emitted by Tokens.php
 * (colours, type, spacing presets, tone presets).
 */

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

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

:root {
  --rail-width: 280px;
  --rail-collapsed: 72px;
  --rail-offset: var(--rail-width);

  /* Transition timing tokens (used by both rail and page transitions). */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-rail: 320ms;
  --dur-page: 420ms;

  --chrome-dark: #36454f;
  --chrome-light: #f4ede3;
  --chrome-primary: #ff1aba;
}

html {
  -webkit-text-size-adjust: 100%;
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(
    --font-body,
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif
  );
  font-size: var(--type-body, 1rem);
  line-height: 1.55;
  color: var(--chrome-dark);
  background: var(--chrome-light);
  min-height: 100vh;
}

body.rail-closed {
  --rail-offset: var(--rail-collapsed);
}

a {
  color: var(--chrome-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.bg-skip {
  position: absolute;
  left: -10000px;
  top: auto;
}
.bg-skip:focus {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--chrome-dark);
  color: var(--chrome-light);
  border-radius: var(--radius-sm, 4px);
}

/* --------------------------------------------------------------------------
   Left rail
   -------------------------------------------------------------------------- */

.bg-rail {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  height: 100dvh; /* respect mobile browser chrome */
  width: var(--rail-width);
  background: var(--chrome-dark);
  color: var(--chrome-light);
  z-index: 50;
  display: flex;
  flex-direction: column;
  transition: width var(--dur-rail) var(--ease);
  border-right: 1px solid
    color-mix(in srgb, var(--chrome-light) 8%, transparent);
  overflow: hidden;
}

body.rail-closed .bg-rail {
  width: var(--rail-collapsed);
}

/* Toggle button sits in the top-left corner of the rail. When closed,
   it's the only visible control. */
.bg-rail__toggle {
  position: absolute;
  top: 1rem;
  left: 1rem;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: transparent;
  border: 1px solid color-mix(in srgb, var(--chrome-light) 18%, transparent);
  border-radius: var(--radius-sm, 4px);
  cursor: pointer;
  color: var(--chrome-light);
  z-index: 2;
  transition:
    background var(--dur-rail) var(--ease),
    border-color var(--dur-rail) var(--ease);
}
.bg-rail__toggle:hover {
  background: color-mix(in srgb, var(--chrome-light) 8%, transparent);
  border-color: color-mix(in srgb, var(--chrome-light) 35%, transparent);
}
.bg-rail__toggle:focus-visible {
  outline: 2px solid var(--chrome-primary);
  outline-offset: 2px;
}

.bg-burger {
  width: 18px;
  height: 14px;
  position: relative;
  display: inline-block;
}
.bg-burger span {
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition:
    transform var(--dur-rail) var(--ease),
    opacity var(--dur-rail) var(--ease),
    top var(--dur-rail) var(--ease);
}
.bg-burger span:nth-child(1) {
  top: 0;
}
.bg-burger span:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}
.bg-burger span:nth-child(3) {
  top: 100%;
  transform: translateY(-100%);
}

/* When the rail is open, the burger becomes an X — visual feedback that
   pressing it again closes the panel. */
body.rail-open .bg-burger span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}
body.rail-open .bg-burger span:nth-child(2) {
  opacity: 0;
}
body.rail-open .bg-burger span:nth-child(3) {
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

.bg-rail__inner {
  position: absolute;
  inset: 0;
  padding: 5rem 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  width: var(--rail-width); /* fixed width so collapse animates cleanly */
  transition: opacity calc(var(--dur-rail) * 0.6) var(--ease);
}
body.rail-closed .bg-rail__inner {
  opacity: 0;
  pointer-events: none;
  transition: opacity calc(var(--dur-rail) * 0.4) var(--ease);
}

.bg-rail__brand {
  color: inherit;
  text-decoration: none;
  display: inline-block;
  margin-bottom: 0.75rem;
}
/* Raster real logo: knock it to white against the ink rail. */
.bg-rail__brand img,
.bg-rail__brand .bg-logo-img {
  max-height: 34px;
  width: auto;
  filter: brightness(0) invert(1);
}
/* Inline SVG logo (real SVG or bundled placeholder): inherits the rail's
   light text colour via currentColor — no filter needed. */
.bg-rail__brand .bg-logo-svg {
  display: inline-block;
  color: var(--chrome-light);
}
.bg-rail__brand .bg-logo-svg svg {
  height: 32px;
  width: auto;
  max-width: 200px;
  display: block;
}
.bg-rail__brand-text {
  font-family: var(--font-display, Georgia);
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}

.bg-rail__eyebrow {
  margin: 0 0 3rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--chrome-light) 55%, transparent);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.bg-rail__version {
  font-variant-numeric: tabular-nums;
}

.bg-rail__nav {
  flex: 1;
}

.bg-rail__menu {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.bg-rail__link {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.7rem 0;
  color: color-mix(in srgb, var(--chrome-light) 72%, transparent);
  text-decoration: none;
  font-family: var(--font-display, Georgia);
  font-size: 1.4rem;
  letter-spacing: -0.01em;
  line-height: 1.15;
  border-bottom: 1px solid
    color-mix(in srgb, var(--chrome-light) 6%, transparent);
  transition:
    color var(--dur-rail) var(--ease),
    padding-left var(--dur-rail) var(--ease);
}
.bg-rail__link:hover {
  color: var(--chrome-light);
  padding-left: 4px;
}
.bg-rail__num {
  font-family: var(--font-body, sans-serif);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--chrome-light) 35%, transparent);
  font-variant-numeric: tabular-nums;
  min-width: 1.4em;
}
.bg-rail__item.is-current .bg-rail__link {
  color: var(--chrome-light);
}
.bg-rail__item.is-current .bg-rail__num {
  color: var(--chrome-primary);
}
.bg-rail__item.is-current .bg-rail__link::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--chrome-primary);
  border-radius: 50%;
  margin-left: auto;
  align-self: center;
}

.bg-rail__foot {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid color-mix(in srgb, var(--chrome-light) 8%, transparent);
  font-size: 0.78rem;
  color: color-mix(in srgb, var(--chrome-light) 50%, transparent);
}
.bg-rail__foot a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.bg-rail__foot a:hover {
  color: var(--chrome-light);
}

/* --------------------------------------------------------------------------
   Main content area
   -------------------------------------------------------------------------- */

.bg-main {
  margin-left: var(--rail-offset);
  transition: margin-left var(--dur-rail) var(--ease);
  min-height: 100vh;
  min-height: 100dvh;
}

/* --------------------------------------------------------------------------
   Page transition (fallback for browsers without View Transitions API)
   -------------------------------------------------------------------------- */

.bg-main.is-transitioning {
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity calc(var(--dur-page) * 0.4) var(--ease-out),
    transform calc(var(--dur-page) * 0.4) var(--ease-out);
}
.bg-main {
  transition:
    margin-left var(--dur-rail) var(--ease),
    opacity calc(var(--dur-page) * 0.6) var(--ease-out),
    transform calc(var(--dur-page) * 0.6) var(--ease-out);
}

/* View Transitions API styling. The pseudo-elements only exist in browsers
   that support the API; everywhere else these rules are inert. */
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: var(--dur-page);
    animation-timing-function: var(--ease-out);
  }
  ::view-transition-old(root) {
    animation-name: bg-fade-down;
  }
  ::view-transition-new(root) {
    animation-name: bg-fade-up;
  }
}

@keyframes bg-fade-down {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-12px);
  }
}
@keyframes bg-fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   Section scaffolding
   -------------------------------------------------------------------------- */

.bg-section {
  padding: var(--section-padding, 5rem) 0;
}
.bg-section--overview {
  padding: 0;
} /* hero handles its own spacing */

.bg-section__container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 3rem);
}
.bg-section__header {
  margin-bottom: var(--block-gap, 1.5rem);
}
.bg-section__eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--chrome-primary);
  margin: 0 0 1.25rem;
  font-weight: 600;
}
.bg-section__title {
  font-family: var(--font-display, Georgia, serif);
  font-size: clamp(2.5rem, 5.5vw, 4.25rem);
  line-height: 1.02;
  margin: 0 0 var(--rhythm, 1.25rem);
  letter-spacing: -0.025em;
}
.bg-section__intro {
  max-width: 60ch;
  font-size: 1.18rem;
  color: color-mix(in srgb, var(--chrome-dark) 75%, transparent);
  margin: 0;
}

.bg-prose {
  max-width: 65ch;
  margin: var(--rhythm, 1.25rem) 0;
}
.bg-prose > * + * {
  margin-top: var(--rhythm, 1.25rem);
}

.bg-empty {
  border: 1px dashed color-mix(in srgb, var(--chrome-dark) 25%, transparent);
  padding: 1.5rem;
  border-radius: var(--radius-md, 8px);
  color: color-mix(in srgb, var(--chrome-dark) 65%, transparent);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   Hero (Overview — 100vh)
   -------------------------------------------------------------------------- */

.bg-hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: clamp(2rem, 6vw, 4rem);
  overflow: hidden;
  background: var(--chrome-light);
  color: var(--chrome-dark);
  isolation: isolate;
}
.bg-hero__backdrop {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.45;
  z-index: -2;
  transform: scale(1.05);
  animation: bg-hero-drift 24s ease-in-out infinite alternate;
}
.bg-hero__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--chrome-dark) 90%, transparent) 0%,
    color-mix(in srgb, var(--chrome-dark) 60%, transparent) 60%,
    color-mix(in srgb, var(--chrome-primary) 40%, transparent) 100%
  );
  z-index: -1;
  display: none;
}

@keyframes bg-hero-drift {
  from {
    transform: scale(1.05) translate(0, 0);
  }
  to {
    transform: scale(1.12) translate(-2%, -1%);
  }
}

.bg-hero__inner {
  max-width: 1100px;
  width: 100%;
}

/* Showcase variant: logo on construction grid (left) + text (right). */
.bg-hero--showcase .bg-hero__inner {
  max-width: 1280px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.bg-hero--showcase .bg-hero__text {
  min-width: 0;
}
.bg-hero--showcase .bg-hero__title {
  font-size: clamp(2.5rem, 6vw, 5.5rem);
} /* smaller title in two-col */
.bg-hero--showcase .bg-hero__tagline {
  margin-bottom: 2rem;
}

/* The showcase panel: construction grid + centred logo + corner ticks. */
.bg-hero__showcase {
  position: relative;
  margin: 0;
  aspect-ratio: 1.1 / 1; /* roughly square, slightly wider */
  background: color-mix(in srgb, var(--chrome-light) 4%, transparent);
  border: 1px solid color-mix(in srgb, var(--chrome-light) 12%, transparent);
  border-radius: var(--radius-md, 8px);
  display: grid;
  place-items: center;
  overflow: hidden;
  isolation: isolate;
}

/* The grid itself — two layers of linear-gradients: a fine 1-unit grid in a
   muted primary colour, and a stronger 4-unit grid in the same colour at
   higher contrast. Sized by --grid-unit, which scales with the panel. */
.bg-hero__grid {
  position: absolute;
  inset: 0;
  --grid-unit: clamp(18px, 2.4vw, 28px);
  --grid-line: color-mix(in srgb, var(--chrome-primary) 28%, transparent);
  --grid-line-bold: color-mix(in srgb, var(--chrome-primary) 55%, transparent);
  background-image:
		/* Bold lines every 4 cells */
    linear-gradient(to right, var(--grid-line-bold) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-bold) 1px, transparent 1px),
    /* Fine lines every cell */
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size:
    calc(var(--grid-unit) * 4) calc(var(--grid-unit) * 4),
    calc(var(--grid-unit) * 4) calc(var(--grid-unit) * 4),
    var(--grid-unit) var(--grid-unit),
    var(--grid-unit) var(--grid-unit);
  /* Subtle radial fade — grid is densest near the logo and dissolves at edges. */
  mask-image: radial-gradient(ellipse at center, black 35%, transparent 90%);
  -webkit-mask-image: radial-gradient(
    ellipse at center,
    black 35%,
    transparent 90%
  );
  animation: bg-grid-breathe 8s ease-in-out infinite alternate;
}
@keyframes bg-grid-breathe {
  from {
    opacity: 0.85;
    transform: scale(1);
  }
  to {
    opacity: 1;
    transform: scale(1.015);
  }
}

/* The logo itself, centred over the grid. Sized to ~40% of the panel so
   plenty of grid shows around it (this is the "clear space" demonstration). */
.bg-hero__mark {
  position: relative;
  z-index: 2;
  color: var(--chrome-light);
  width: 56%;
  max-width: 360px;
  display: grid;
  place-items: center;
}
.bg-hero__mark .bg-logo-svg svg,
.bg-hero__mark .bg-logo-img {
  width: 100%;
  height: auto;
  max-height: 220px;
  display: block;
}
.bg-hero__mark .bg-logo-img {
  filter: brightness(0) invert(1);
}

/* Corner ticks — a small affordance that reads as "this is a measured frame",
   like crop marks on a print spec. */
.bg-hero__corners {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.bg-hero__corners span {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid color-mix(in srgb, var(--chrome-light) 40%, transparent);
}
.bg-hero__corners span:nth-child(1) {
  top: 10px;
  left: 10px;
  border-right: 0;
  border-bottom: 0;
}
.bg-hero__corners span:nth-child(2) {
  top: 10px;
  right: 10px;
  border-left: 0;
  border-bottom: 0;
}
.bg-hero__corners span:nth-child(3) {
  bottom: 10px;
  left: 10px;
  border-right: 0;
  border-top: 0;
}
.bg-hero__corners span:nth-child(4) {
  bottom: 10px;
  right: 10px;
  border-left: 0;
  border-top: 0;
}

.bg-hero__logo {
  margin: 0 0 2.5rem;
  color: var(--chrome-light); /* currentColor source for inline SVG */
}
.bg-hero__logo .bg-logo-svg svg {
  height: 48px;
  width: auto;
  max-width: 320px;
}
.bg-hero__logo .bg-logo-img {
  height: 48px;
  width: auto;
  filter: brightness(0) invert(1);
}
.bg-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 2rem;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--chrome-light) 70%, transparent);
  font-weight: 600;
}
.bg-hero__dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--chrome-primary);
  border-radius: 50%;
}
.bg-hero__title {
  font-family: var(--font-display, Georgia, serif);
  font-size: clamp(3rem, 9vw, 8rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 0 0 1.5rem;
  font-weight: 400;
}
.bg-hero__tagline {
  font-family: var(--font-display, Georgia);
  font-style: italic;
  max-width: 38ch;
  font-size: clamp(1.15rem, 2vw, 1.6rem);
  color: color-mix(in srgb, var(--chrome-dark) 85%, transparent);
  margin: 0 0 3rem;
  line-height: 1.35;
}
.bg-hero__scroll {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: color-mix(in srgb, var(--chrome-dark) 75%, transparent);
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.65rem 1.1rem 0.65rem 0;
  border-bottom: 1px solid
    color-mix(in srgb, var(--chrome-light) 25%, transparent);
  transition:
    color 200ms var(--ease),
    gap 200ms var(--ease);
}
.bg-hero__scroll:hover {
  color: var(--chrome-dark);
  gap: 0.9rem;
}
.bg-hero__scroll svg {
  transition: transform 200ms var(--ease);
}
.bg-hero__scroll:hover svg {
  transform: translateY(2px);
}

.bg-overview__prose {
  padding: var(--section-padding, 5rem) 0;
}

/* --------------------------------------------------------------------------
   Buttons & section actions
   -------------------------------------------------------------------------- */

.bg-section__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 var(--block-gap, 1.5rem);
}

.bg-button {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: var(--btn-pad-y, 0.7rem) var(--btn-pad-x, 1.5rem);
  background: var(--chrome-dark);
  color: var(--chrome-light);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md, 8px);
  border: 1px solid transparent;
  transition:
    background 200ms var(--ease),
    transform 160ms var(--ease-out),
    gap 200ms var(--ease);
}
.bg-button:hover {
  background: var(--chrome-primary);
  transform: translateY(-1px);
  gap: 0.75rem;
}
.bg-button:focus-visible {
  outline: 2px solid var(--chrome-primary);
  outline-offset: 2px;
}
.bg-button svg {
  flex: none;
}
.bg-button__meta {
  margin-left: 0.15rem;
  padding-left: 0.65rem;
  border-left: 1px solid
    color-mix(in srgb, var(--chrome-light) 25%, transparent);
  font-size: 0.78rem;
  opacity: 0.75;
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   Logos
   -------------------------------------------------------------------------- */

.bg-logos__group {
  margin-top: calc(var(--section-padding) / 2);
}
.bg-logos__group:first-of-type {
  margin-top: 0;
}
.bg-logos__group-title {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--chrome-primary);
  margin: 0 0 var(--block-gap);
}
.bg-logos__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--block-gap, 1.5rem);
  margin: var(--block-gap) 0;
}
.bg-logos__stage {
  background: #fff;
  border: 1px solid color-mix(in srgb, var(--chrome-dark) 8%, transparent);
  border-radius: var(--radius-md, 8px);
  padding: 2.5rem 1.5rem;
  display: grid;
  place-items: center;
  min-height: 180px;
}
.bg-logos__stage.is-dark {
  background: var(--chrome-dark);
}
.bg-logos__stage img {
  max-height: 90px;
}
.bg-logos__variant figcaption {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 0.6rem;
  font-size: 0.9rem;
}
.bg-logos__label {
  text-transform: capitalize;
  color: color-mix(in srgb, var(--chrome-dark) 70%, transparent);
}
.bg-logos__download {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--chrome-primary);
}
.bg-logos__rules {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--block-gap);
  margin: calc(var(--section-padding) / 2) 0;
}
.bg-logos__rules h2 {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--chrome-primary);
  margin: 0 0 0.5rem;
}
.bg-logos__usage {
  margin-top: calc(var(--section-padding) / 2);
}

/* --------------------------------------------------------------------------
   Colours
   -------------------------------------------------------------------------- */

/* Palette blend — a continuous gradient through every colour in config order,
   with labelled ticks beneath. */
.bg-blend {
  margin: 0 0 calc(var(--block-gap) * 1.5);
}
.bg-blend__bar {
  height: 120px;
  border-radius: var(--radius-md, 8px);
  box-shadow: var(--shadow);
}
.bg-blend__stops {
  display: flex;
  margin-top: 0.85rem;
}
.bg-blend__stop {
  flex: 1 1 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0; /* allow names to truncate rather than overflow */
}
/* Centre the interior stops, push the first left and last right so ticks sit
   roughly under their gradient positions. */
.bg-blend__stop:first-child {
  justify-content: flex-start;
}
.bg-blend__stop:last-child {
  justify-content: flex-end;
}
.bg-blend__stop:not(:first-child):not(:last-child) {
  justify-content: center;
}
.bg-blend__tick {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--chrome-dark) 12%, transparent)
    inset;
}
.bg-blend__name {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--chrome-dark) 60%, transparent);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bg-colours__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--block-gap, 1.5rem);
  margin-top: var(--block-gap);
}
.bg-swatch {
  background: #fff;
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition:
    transform 240ms var(--ease-out),
    box-shadow 240ms var(--ease-out);
  cursor: pointer;
  position: relative;
}
.bg-swatch:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(26, 24, 44, 0.14);
}
.bg-swatch:focus-visible {
  outline: 2px solid var(--chrome-primary);
  outline-offset: 3px;
}
.bg-swatch__chip {
  height: 140px;
  border-bottom: 1px solid color-mix(in srgb, currentColor 8%, transparent);
  position: relative;
  display: grid;
  place-items: center;
}
.bg-swatch__hint {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  color: #fff;
  background: color-mix(in srgb, var(--chrome-dark) 55%, transparent);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity 200ms var(--ease),
    transform 200ms var(--ease);
  backdrop-filter: blur(2px);
  pointer-events: none;
}
.bg-swatch:hover .bg-swatch__hint,
.bg-swatch:focus-visible .bg-swatch__hint {
  opacity: 1;
  transform: translateY(0);
}
/* Confirmation: replaces the hint text with "Copied" via the is-copied class. */
.bg-swatch.is-copied .bg-swatch__hint {
  opacity: 1;
  transform: translateY(0);
  background: var(--chrome-primary);
  font-size: 0; /* hide the original "Click to copy" text */
}
.bg-swatch.is-copied .bg-swatch__hint::after {
  content: "Copied ✓";
  font-size: 0.72rem; /* re-establish size for the replacement text */
  letter-spacing: 0.12em;
}
.bg-swatch.is-copied .bg-swatch__chip {
  box-shadow: inset 0 0 0 3px var(--chrome-primary);
}

/* Individual value buttons */
.bg-copy.is-copied {
  color: var(--chrome-primary);
}
.bg-copy.is-copied::after {
  content: " ✓";
}
.bg-swatch__meta {
  padding: 1rem 1.1rem 1.2rem;
}
.bg-swatch__name {
  font-family: var(--font-display, Georgia);
  font-size: 1.3rem;
  margin: 0 0 0.25rem;
  letter-spacing: -0.015em;
}
.bg-swatch__desc {
  font-size: 0.9rem;
  color: color-mix(in srgb, var(--chrome-dark) 65%, transparent);
  margin: 0 0 0.75rem;
}
.bg-swatch__values {
  margin: 0;
  font-size: 0.82rem;
}
.bg-swatch__values div {
  display: flex;
  justify-content: space-between;
  padding: 0.3rem 0;
  border-top: 1px solid color-mix(in srgb, var(--chrome-dark) 8%, transparent);
}
.bg-swatch__values dt {
  color: color-mix(in srgb, var(--chrome-dark) 55%, transparent);
  margin: 0;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.72rem;
}
.bg-swatch__values dd {
  margin: 0;
}
.bg-copy {
  background: none;
  border: 0;
  padding: 0.1rem 0;
  font: inherit;
  cursor: pointer;
  color: inherit;
  font-variant-numeric: tabular-nums;
  border-radius: var(--radius-sm, 4px);
  transition: color 160ms var(--ease);
}
.bg-copy:hover {
  color: var(--chrome-primary);
}
.bg-copy:focus-visible {
  outline: 2px solid var(--chrome-primary);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

.bg-type__families {
  display: grid;
  gap: var(--block-gap);
  margin: var(--block-gap) 0 calc(var(--section-padding) * 0.6);
}

/* Each family is a foundry-style specimen: a huge glyph poster paired with
   the character set and details. */
.bg-type__family {
  display: grid;
  grid-template-columns: minmax(180px, 0.9fr) 1.6fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: stretch;
  background: #fff;
  border-radius: var(--radius-md, 8px);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.bg-type__poster {
  display: grid;
  place-items: center;
  background: var(--chrome-dark);
  color: var(--chrome-light);
  font-size: clamp(6rem, 16vw, 0rem);
  line-height: 1;
  padding: 1.5rem;
  user-select: none;
  position: relative;
}
/* A faint accent wash so the poster panel doesn't read as flat black. */
.bg-type__poster::after {
  content: "";
  display: none;
  position: absolute;
  inset: 0;
  background: radial-gradient(
    120% 120% at 70% 20%,
    color-mix(in srgb, var(--chrome-primary) 32%, transparent),
    transparent 60%
  );
  pointer-events: none;
}
.bg-type__detail {
  padding: 1.75rem 1.75rem 1.9rem 0;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.bg-type__head {
  margin-bottom: 1.25rem;
}
.bg-type__role {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--chrome-primary);
  margin: 0 0 0.4rem;
  font-weight: 600;
}
.bg-type__name {
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  margin: 0;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.bg-type__charset {
  font-size: clamp(1rem, 1.6vw, 1.35rem);
  line-height: 1.7;
  margin: 0 0 1.25rem;
  color: var(--chrome-dark);
  word-break: break-word;
  border-bottom: 1px solid
    color-mix(in srgb, var(--chrome-dark) 8%, transparent);
  padding-bottom: 1.25rem;
}
.bg-type__specimen {
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
  margin: auto 0 0;
  color: color-mix(in srgb, var(--chrome-dark) 82%, transparent);
  line-height: 1.4;
}

.bg-type__section-title {
  font-family: var(--font-display, Georgia);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: -0.02em;
  margin: 0 0 var(--rhythm);
}

.bg-type__scale {
  margin-bottom: calc(var(--section-padding) * 0.6);
}
.bg-type__scale-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
}
.bg-type__scale-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  gap: 1.25rem;
  align-items: baseline;
  padding: 0.75rem 0;
  border-bottom: 1px solid
    color-mix(in srgb, var(--chrome-dark) 8%, transparent);
}
.bg-type__step {
  font-size: 0.72rem;
  color: color-mix(in srgb, var(--chrome-dark) 55%, transparent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}
.bg-type__sample {
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--chrome-dark);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
  transition: color 200ms var(--ease);
}
.bg-type__scale-list li:hover .bg-type__sample {
  color: var(--chrome-primary);
}
.bg-type__size {
  font-size: 0.82rem;
  color: color-mix(in srgb, var(--chrome-dark) 55%, transparent);
  font-variant-numeric: tabular-nums;
}

.bg-type__usage table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}
.bg-type__usage th {
  text-align: left;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--chrome-dark) 55%, transparent);
  padding: 0.85rem 0;
  border-bottom: 1px solid
    color-mix(in srgb, var(--chrome-dark) 15%, transparent);
  font-weight: 600;
}
.bg-type__usage td {
  padding: 0.95rem 0;
  border-bottom: 1px solid
    color-mix(in srgb, var(--chrome-dark) 8%, transparent);
  font-size: 0.95rem;
  vertical-align: top;
}

/* --------------------------------------------------------------------------
   Imagery
   -------------------------------------------------------------------------- */

.bg-imagery__direction {
  max-width: 65ch;
  margin: var(--block-gap) 0 calc(var(--block-gap) * 1.5);
}
.bg-imagery__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--block-gap, 1.5rem);
}
.bg-imagery__item {
  margin: 0;
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: color-mix(in srgb, var(--chrome-dark) 5%, transparent);
  transition: transform 320ms var(--ease-out);
}
.bg-imagery__item:hover {
  transform: scale(1.01);
}
.bg-imagery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --------------------------------------------------------------------------
   Brand voice
   -------------------------------------------------------------------------- */

.bg-voice__chips {
  list-style: none;
  padding: 0;
  margin: var(--block-gap) 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.bg-voice__chip {
  background: color-mix(in srgb, var(--chrome-primary) 12%, transparent);
  color: var(--chrome-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-lg, 14px);
  font-size: 0.95rem;
  font-weight: 600;
}

.bg-dosdonts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--block-gap);
  margin: var(--block-gap) 0;
}
.bg-dosdonts > div {
  background: #fff;
  border-radius: var(--radius-md, 8px);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow);
}
.bg-dosdonts__label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 0.7rem;
}
.bg-dosdonts__do .bg-dosdonts__label {
  background: color-mix(in srgb, var(--chrome-primary) 18%, transparent);
  color: var(--chrome-primary);
}
.bg-dosdonts__dont .bg-dosdonts__label {
  background: rgba(255, 94, 81, 0.18);
  color: #ff5e51;
}

.bg-voice__samples ul {
  list-style: none;
  padding: 0;
  margin: var(--block-gap) 0;
  display: grid;
  gap: var(--rhythm);
}
.bg-voice__sample blockquote {
  margin: 0;
  font-family: var(--font-display, Georgia);
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
  line-height: 1.3;
  color: var(--chrome-dark);
  border-left: 3px solid var(--chrome-primary);
  padding-left: 1.5rem;
  letter-spacing: -0.015em;
}

/* --------------------------------------------------------------------------
   Colophon — kept for non-section pages; main pages don't render it.
   -------------------------------------------------------------------------- */

.bg-colophon {
  border-top: 1px solid color-mix(in srgb, var(--chrome-dark) 10%, transparent);
  padding: 2.5rem 0;
  font-size: 0.9rem;
}
.bg-colophon__inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 3rem);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.bg-colophon p {
  margin: 0;
}
.bg-colophon__credit {
  color: color-mix(in srgb, var(--chrome-dark) 60%, transparent);
}
.bg-colophon a {
  color: inherit;
}

/* --------------------------------------------------------------------------
   Small screens — rail becomes an overlay
   -------------------------------------------------------------------------- */

@media (max-width: 899px) {
  body.has-rail {
    --rail-offset: var(--rail-collapsed);
  }
  body.rail-open .bg-rail {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  }
  body.rail-open .bg-main {
    pointer-events: none;
    opacity: 0.4;
    transition: opacity var(--dur-rail) var(--ease);
  }
  /* In overlay mode, content never shifts — the rail floats over it. */
  .bg-main {
    margin-left: var(--rail-collapsed);
  }
}

@media (max-width: 720px) {
  .bg-dosdonts {
    grid-template-columns: 1fr;
  }
  .bg-hero {
    padding: 6rem 1.5rem 3rem;
  }
  .bg-hero--showcase .bg-hero__inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .bg-hero__showcase {
    aspect-ratio: 1 / 1;
    max-width: 420px;
  }
  .bg-blend__name {
    display: none;
  } /* ticks alone read fine when cramped */
  .bg-blend__bar {
    height: 88px;
  }
  .bg-type__family {
    grid-template-columns: 1fr;
  }
  .bg-type__poster {
    font-size: clamp(6rem, 30vw, 9rem);
    padding: 2rem 1rem;
  }
  .bg-type__detail {
    padding: 1.5rem;
  }
  .bg-type__scale-list li {
    grid-template-columns: 3.5rem 1fr;
    gap: 0.5rem 1rem;
  }
  .bg-type__scale-list .bg-type__size {
    grid-column: 2;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .bg-hero__backdrop {
    animation: none;
  }
}