:root {
  /* 01-Colors.json Authoritative Tokens */
  --color-canvas: #EFF7F6;
  --color-sidebar: #EAF4F2;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #F5FAF9;
  --color-text-primary: #163B3D;
  --color-text-secondary: #526D70;
  --color-text-muted: #586F72;
  --color-border-subtle: #D9E7E4;
  --color-border-control: #728D8A;
  --color-primary: #063D40;
  --color-primary-hover: #0B5052;
  --color-primary-pressed: #032B2D;
  --color-on-primary: #FFFFFF;
  --color-selected: #DDF0EB;
  --color-selected-text: #063D40;
  --color-success: #147D64;
  --color-success-surface: #E8F5EF;
  --color-warning: #925A0A;
  --color-warning-surface: #FFF4DF;
  --color-danger: #B93848;
  --color-danger-surface: #FDECEF;
  --color-focus: #0B6768;
  --color-disabled-surface: #E4ECEA;
  --color-disabled-text: #718682;
  --color-overlay: rgba(6, 61, 64, 0.24);
  --color-accent-mint: #A5DDD3;
  --color-accent-blush: #F2BAC3;
  --color-region-us: #DDF2ED;
  --color-region-uk: #FBE8EC;
  --color-region-europe: #F5FAF9;
  --color-nav-active: #063D40;
  --color-nav-icon-surface: #DDF0EB;

  /* Scoped layout variables mapped to tokens */
  --canvas: var(--color-canvas);
  --sidebar: var(--color-sidebar);
  --surface: var(--color-surface);
  --subtle-surface: var(--color-surface-subtle);
  --ink: var(--color-text-primary);
  --muted: var(--color-text-secondary);
  --line: var(--color-border-subtle);
  --control-border: var(--color-border-control);
  --teal: var(--color-primary);
  --teal-hover: var(--color-primary-hover);
  --teal-pressed: var(--color-primary-pressed);
  --mint: var(--color-accent-mint);
  --mint-soft: var(--color-selected);
  --blush: var(--color-accent-blush);
  --radius: 20px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--color-text-primary);
  background-color: var(--color-canvas);
  font: 17px/1.68 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow-wrap: anywhere;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }

h1, h2, h3, h4, p, figure { margin-top: 0; }
h1, h2, h3, h4 { color: var(--color-primary); line-height: 1.18; max-width: none; }
h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); margin-bottom: 18px; letter-spacing: -.035em; }
h2 { font-size: clamp(1.5rem, 2.4vw, 2.1rem); margin-bottom: 20px; letter-spacing: -.025em; max-width: none; width: 100%; }
h3 { margin: 24px 0 12px; font-size: 1.15rem; font-weight: 600; letter-spacing: -.01em; max-width: none; }
h4 { font-size: 1.1rem; margin-bottom: 8px; font-weight: 600; max-width: none; }

.container { width: min(calc(100% - 48px), var(--max)); margin: auto; }

.skip-link {
  position: fixed; z-index: 100; top: 10px; left: 10px;
  padding: 10px 16px; background: var(--color-accent-mint); color: var(--color-primary);
  font-weight: 700; border-radius: 8px; transform: translateY(-150%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: none; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 4px; }

header {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-primary);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  color: var(--color-on-primary);
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { font-weight: 800; font-size: 1.05rem; text-decoration: none; color: var(--color-on-primary); }
.nav nav { display: flex; align-items: center; gap: 24px; }
.nav nav > a { font-size: 0.92rem; font-weight: 600; text-decoration: none; color: var(--color-selected); transition: color .2s; }
.nav nav > a:hover { color: var(--color-on-primary); }

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 22px; border: 2px solid var(--color-primary); border-radius: 12px;
  background: var(--color-primary); color: var(--color-on-primary); font-weight: 700; font-size: 0.95rem;
  text-decoration: none; line-height: 1.2; cursor: pointer;
  transition: background .2s, border-color .2s, transform .15s;
}
.button:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); color: var(--color-on-primary); }
.button:active { background: var(--color-primary-pressed); border-color: var(--color-primary-pressed); }
.button.small { padding: 9px 16px; font-size: 0.85rem; border-radius: 8px; }
.button.header { background: var(--color-accent-mint); color: var(--color-primary); border-color: var(--color-accent-mint); }
.button.header:hover { background: var(--color-on-primary); border-color: var(--color-on-primary); color: var(--color-primary); }
.button.secondary { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.button.secondary:hover { background: var(--color-selected); }
.hero .button.secondary { color: var(--color-on-primary); border-color: rgba(255,255,255,0.4); }
.hero .button.secondary:hover { background: rgba(255,255,255,0.15); border-color: var(--color-on-primary); }

.hero {
  padding: clamp(2rem, 4vw, 3.2rem) 0;
  background: var(--color-primary); color: var(--color-on-primary);
}
.hero h1 { color: var(--color-on-primary); font-size: clamp(2.2rem, 3.8vw, 3.2rem); margin-bottom: 6px; }
.hero .eyebrow {
  display: inline-block; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent-mint);
  margin-bottom: 8px;
}
.subtitle { color: var(--color-selected); font-size: clamp(1.1rem, 1.8vw, 1.38rem); line-height: 1.35; margin-bottom: 12px; font-weight: 500; }
.hero-intro { color: var(--color-sidebar); font-size: 0.94rem; line-height: 1.5; max-width: 58ch; margin-bottom: 18px; }

.hero-grid {
  display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(24px, 4vw, 44px); align-items: center;
}
.hero .button { padding: 10px 18px; font-size: 0.88rem; border-radius: 10px; }
.hero dl { display: grid; gap: 6px; margin-top: 14px; }
.hero dl div {
  display: grid; grid-template-columns: 88px minmax(0, 1fr); gap: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.12); padding-top: 6px;
}
.hero dt { color: var(--color-accent-mint); font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
.hero dd { margin: 0; font-size: 0.85rem; color: var(--color-surface-subtle); line-height: 1.35; }

.hero figure { margin: 0; position: relative; border-radius: 14px; overflow: hidden; box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25); background: var(--color-surface); }
.hero img { display: block; width: 100%; height: auto; object-fit: contain; }

.content { padding-top: 0; }
.content > section {
  padding-block: clamp(3rem, 5vw, 4.5rem);
  border-bottom: 1px solid var(--color-border-subtle);
}
.content > section:last-of-type { border-bottom: none; }

.grid { display: grid; gap: 24px; }
.three { grid-template-columns: repeat(3, 1fr); }
.two { grid-template-columns: 1fr 1fr; }

.cards article, .three article {
  padding: 28px; border: 1px solid var(--color-border-subtle); border-radius: var(--radius);
  background: var(--color-surface); box-shadow: 0 4px 16px rgba(6, 61, 64, 0.03);
}
.cards article p, .three article p { margin-bottom: 0; font-size: 0.96rem; color: var(--color-text-secondary); }
.cards article h3, .three article h3, .cards article h4 { margin-top: 0; color: var(--color-primary); }

.lead { max-width: none; color: var(--color-text-primary); font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 500; }
li { margin: 10px 0; color: var(--color-text-secondary); }

aside {
  padding: 26px 30px; border-left: 5px solid var(--color-primary); border-radius: 0 16px 16px 0;
  background: var(--color-surface); border-top: 1px solid var(--color-border-subtle); border-right: 1px solid var(--color-border-subtle); border-bottom: 1px solid var(--color-border-subtle);
  box-shadow: 0 4px 16px rgba(6, 61, 64, 0.03);
}
aside h3 { margin-top: 0; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-primary); }
aside p { margin-bottom: 0; color: var(--color-text-primary); font-size: 0.96rem; }

.stages { margin-top: 24px; }
.stages article { font-weight: 600; color: var(--color-text-primary); }

.screen {
  padding: clamp(24px, 4vw, 42px); border: 1px solid var(--color-border-subtle);
  border-radius: 24px; background: var(--color-surface); box-shadow: 0 4px 20px rgba(6, 61, 64, 0.04);
}
.screen figure { margin: 32px 0 0; text-align: center; }
.screen figure figcaption { margin-top: 14px; font-size: 0.88rem; color: var(--color-text-secondary); font-style: italic; }
.screen img {
  display: block; width: 100%; height: auto; border-radius: 12px;
  border: 1px solid var(--color-border-subtle); cursor: zoom-in; transition: transform .2s ease, box-shadow .2s ease;
}
.screen img:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(6, 61, 64, 0.08); }

.decision {
  padding: 32px clamp(24px, 4vw, 48px); border-radius: var(--radius);
  background: var(--color-primary); color: var(--color-on-primary); margin-top: 32px;
}
.decision h2 { color: var(--color-accent-mint); font-size: clamp(1.2rem, 2.4vw, 1.6rem); margin-bottom: 12px; }
.decision p { max-width: none; margin-bottom: 0; color: var(--color-sidebar); font-size: 1.05rem; }

/* Design System Tokens Section */
.design-system {
  padding: 40px; border: 1px solid var(--color-border-subtle); border-radius: 24px;
  background: var(--color-surface); margin-top: 40px;
}
.design-system__intro { max-width: none; margin-bottom: 36px; color: var(--color-text-secondary); font-size: 1.1rem; }
.design-system__group + .design-system__group { margin-top: 40px; }
.design-system__group > h3 { margin: 0 0 20px; color: var(--color-primary); font-size: 1.4rem; }

.typeface-card {
  display: grid; grid-template-columns: minmax(140px, .3fr) 1fr; gap: 24px;
  align-items: center; padding: 24px; border: 1px solid var(--color-border-subtle);
  border-radius: 12px; background: var(--color-surface-subtle);
}
.typeface-card__sample {
  display: flex; align-items: center; justify-content: center; height: 120px;
  border-radius: 8px; background: var(--color-selected); color: var(--color-primary);
  font-size: 3.5rem; font-weight: 600;
}
.typeface-card__eyebrow { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; color: var(--color-text-secondary); margin-bottom: 6px; }

.type-scale { display: grid; gap: 12px; margin-top: 24px; }
.type-scale__item {
  display: grid; grid-template-columns: minmax(220px, .8fr) 1fr; gap: 20px;
  align-items: center; padding: 14px 20px; border: 1px solid var(--color-border-subtle);
  border-radius: 8px; background: var(--color-surface);
}
.type-scale__preview { color: var(--color-primary); }
.type-scale__item--display .type-scale__preview { font-size: 32px; font-weight: 600; }
.type-scale__item--page .type-scale__preview { font-size: 24px; font-weight: 500; }
.type-scale__item--section .type-scale__preview { font-size: 20px; font-weight: 600; }
.type-scale__item--body-lg .type-scale__preview { font-size: 16px; font-weight: 400; }
.type-scale__item--body .type-scale__preview { font-size: 14px; font-weight: 400; }
.type-scale__item--label .type-scale__preview { font-size: 14px; font-weight: 500; }
.type-scale__item--caption .type-scale__preview { font-size: 12px; font-weight: 400; }
.type-scale__details strong { font-size: 0.85rem; color: var(--color-text-primary); display: block; }
.type-scale__details span { color: var(--color-text-secondary); font-size: 0.75rem; }

.colour-category + .colour-category { margin-top: 28px; }
.colour-category > h4 { margin: 0 0 14px; color: var(--color-primary); font-size: 1.05rem; }
.colour-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.colour-card {
  display: flex; flex-direction: column; overflow: hidden;
  border: 1px solid var(--color-border-subtle); border-radius: 10px; background: var(--color-surface);
}
.colour-card__swatch {
  height: 90px; padding: 10px; display: flex; flex-direction: column;
  justify-content: flex-end; background: var(--swatch); border-bottom: 1px solid var(--color-border-subtle);
}
.colour-card__swatch span { font-size: 0.72rem; font-weight: 700; line-height: 1.2; }
.colour-card__swatch code { font-size: 0.7rem; font-family: monospace; }
.colour-card__swatch--dark { color: var(--color-on-primary); }
.colour-card__swatch--light { color: var(--color-primary); }
.colour-card__body { padding: 12px; }
.colour-card h5 { margin: 0 0 2px; font-size: 0.82rem; color: var(--color-text-primary); }
.colour-card__body code { font-size: 0.75rem; color: var(--color-text-secondary); font-family: monospace; }

.foundations-note {
  margin-top: 32px; padding: 24px; border-left: 4px solid var(--color-primary);
  border-radius: 0 12px 12px 0; background: var(--color-surface-subtle); border-top: 1px solid var(--color-border-subtle); border-right: 1px solid var(--color-border-subtle); border-bottom: 1px solid var(--color-border-subtle);
}

.content section > p { max-width: none; }

.closing {
  padding: 38px; border-radius: var(--radius); background: var(--color-primary); color: var(--color-on-primary); text-align: center;
}
.closing h3 { margin-top: 0; color: var(--color-accent-mint); font-size: 1.8rem; margin-bottom: 14px; }
.closing p { max-width: none; margin: 0 auto 28px; color: var(--color-sidebar); font-size: 1.1rem; }
.closing .cta-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 32px; }
.closing-footer { border-top: 1px solid rgba(255, 255, 255, 0.15); padding-top: 24px; font-size: 0.88rem; color: var(--color-selected); }

/* Accessible Image Modal / Lightbox */
.image-modal {
  display: none; position: fixed; inset: 0; z-index: 1000;
  background: var(--color-overlay); backdrop-filter: blur(8px);
  align-items: center; justify-content: center; padding: 24px;
}
.image-modal.open { display: flex; }
.image-modal-content { position: relative; max-width: 95vw; max-height: 92vh; display: flex; flex-direction: column; align-items: center; }
.image-modal-content img { max-width: 100%; max-height: 85vh; object-fit: contain; border-radius: 8px; box-shadow: 0 16px 50px rgba(0, 0, 0, 0.4); }
.image-modal-close {
  position: absolute; top: -48px; right: 0; background: var(--color-accent-mint); color: var(--color-primary);
  border: none; border-radius: 8px; padding: 8px 16px; font-weight: 700; cursor: pointer; font-size: 0.9rem;
}
.image-modal-close:hover { background: var(--color-on-primary); }
.image-modal-caption { color: var(--color-on-primary); margin-top: 12px; font-size: 0.9rem; text-align: center; }

@media (max-width: 900px) {
  .hero-grid, .three, .two { grid-template-columns: 1fr; }
  .colour-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .type-scale__item { grid-template-columns: 1fr; gap: 6px; }
}
@media (max-width: 600px) {
  .container { width: min(calc(100% - 32px), var(--max)); }
  .nav { min-height: 80px; flex-direction: column; align-items: flex-start; justify-content: center; padding: 12px 0; gap: 8px; }
  .hero dl div { grid-template-columns: 1fr; gap: 4px; }
  .design-system { padding: 24px; }
  .colour-grid { grid-template-columns: 1fr; }
  .typeface-card { grid-template-columns: 1fr; }
}