@layer reset, tokens, base, layout, surfaces, controls, responsive;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body, h1, h2, h3, p, figure, ol, ul { margin: 0; }
  img { display: block; max-width: 100%; }
  button, summary { font: inherit; }
}

@layer tokens {
  :root {
    color-scheme: light;
    --paper: #f8f3e9;
    --ink: #172a3a;
    --copper: #ad512d;
    --wash: #e9deca;
    --line: #afa38e;
    --soft-ink: #435360;
    --white: #fffdf7;
    --focus: #085fa5;
  }
}

@layer base {
  html { font-size: 18px; scroll-padding-top: 1.5rem; }
  body {
    background: var(--paper);
    color: var(--ink);
    font-family: Georgia, 'Times New Roman', Times, serif;
    font-size: 18px;
    line-height: 1.65;
    -webkit-text-size-adjust: 100%;
  }
  h1, h2, h3 { font-weight: 400; text-wrap: balance; }
  h1 { font-size: clamp(2.6rem, 5.6vw, 5rem); line-height: 1.04; letter-spacing: -0.045em; }
  h2, h3 { font-size: clamp(1.7rem, 2.9vw, 2.5rem); line-height: 1.18; letter-spacing: -0.025em; }
  p, li, a, summary, figcaption { font-size: 1rem; }
  p + p { margin-top: 1rem; }
  :is(h2, h3) + p, :is(h2, h3) + ul, :is(h2, h3) + div { margin-top: 1.5rem; }
  a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.22em; }
  :focus-visible { outline: 3px solid var(--focus); outline-offset: 5px; }
  h2:focus, h3:focus, main:focus { outline: none; }
  h2:focus-visible, h3:focus-visible { outline: 3px solid var(--focus); outline-offset: 8px; }
  ul { padding-left: 1.3rem; }
  li + li { margin-top: 0.55rem; }
  ::selection { background: #ecd0ad; color: var(--ink); }
}

@layer layout {
  .page-shell { max-width: 1320px; margin-inline: auto; padding-inline: 4rem; }
  .spread-row { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
  .masthead-space { padding-block: 1.75rem; }
  .masthead-flow p { margin: 0; }
  .crumb-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem 0.5rem; padding: 1rem 0; list-style: none; }
  .crumb-row li { display: flex; align-items: center; margin: 0; min-height: 44px; }
  .crumb-row li + li::before { content: '/'; color: var(--soft-ink); margin-right: 0.75rem; }
  .hero-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); align-items: center; gap: 4rem; }
  .hero-space { padding-block: 2rem 3.5rem; }
  .one-column { grid-template-columns: minmax(0, 1fr); }
  .hero-limit { max-width: 930px; }
  .lead-limit { max-width: 57ch; }
  .lead-space { margin-top: 1.6rem; }
  .reading-column { max-width: 69ch; margin-inline: auto; min-width: 0; }
  .section-space { padding: 3rem 3.5rem; margin-block: 1.5rem; }
  .route-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; }
  .route-space { margin-block: 1.5rem 0.5rem; }
  .route-grid:has(> :only-child) { grid-template-columns: 1fr; }
  .jump-space { margin-block: 0 2rem; }
  .jump-list { list-style: none; padding: 0; margin-top: 0.5rem; }
  .jump-list li + li { margin-top: 0; }
  .source-list { display: flex; flex-wrap: wrap; column-gap: 1.5rem; list-style: none; padding: 0; margin-top: 0.75rem; }
  .source-list li { margin: 0; }
  .next-space { display: flex; justify-content: flex-end; margin-block: 2rem 4rem; }
  .footer-space { padding-block: 2rem 3rem; }
  .footer-flow p { max-width: 52ch; }
}

@layer surfaces {
  .mark-row { display: flex; align-items: center; gap: 0.7rem; }
  .mark-size { font-size: 1.2rem; }
  .mark-rule { display: inline-block; width: 1.5rem; height: 0.65rem; background: var(--copper); border-radius: 0 1rem 1rem 0; }
  .guide-label { color: var(--soft-ink); }
  .copper-text { color: var(--copper); }
  .eyebrow-space { margin-bottom: 1rem; }
  .brief-tone { background: var(--ink); color: var(--paper); }
  .brief-tone :focus-visible { outline-color: #b6d8ef; }
  .band-corners { border-radius: 0.75rem 2.5rem 0.75rem 0.75rem; }
  .rule-top { border-top: 1px solid var(--line); }
  .rule-bottom { border-bottom: 1px solid var(--line); }
  .clip-frame { overflow: hidden; }
  .wash-fill { background: var(--wash); }
  .photo-corners { border-radius: 2.5rem 2.5rem 0.75rem 0.75rem; }
  .photo-fill { width: 100%; height: auto; aspect-ratio: 960 / 704; object-fit: cover; color: var(--ink); font-size: 18px; }
  img[src$='ghk-cu-daylight-papers.webp'] { aspect-ratio: 960 / 640; }
  img[src$='ghk-cu-open-door.webp'] { aspect-ratio: 768 / 960; max-height: 500px; }
  .block-text { display: block; }
  .bold-text { font-weight: 700; }
  .small-top-space { margin-top: 0.5rem; }
  .route-arrow { position: absolute; top: 1rem; right: 1rem; }
  .question-list { list-style: none; padding: 0; margin-block: 1.5rem; }
  .question-list li { padding: 0.9rem 0 0.9rem 1.5rem; border-top: 1px solid var(--line); position: relative; margin: 0; }
  .question-list li::before { content: '→'; position: absolute; left: 0; }
  .plain-list { margin-block: 1.5rem; }
  .source-rule { border-left: 3px solid var(--copper); padding-left: 1.25rem; }
  .brief-tone .source-rule { border-left-color: #ebb083; }
}

@layer controls {
  .skip-link { position: absolute; top: 0; left: 1rem; z-index: 10; padding: 0.7rem 1rem; background: var(--ink); color: var(--paper); min-height: 48px; transform: translateY(-130%); }
  .skip-link:focus { transform: none; }
  .crumb-row a { display: inline-flex; align-items: center; min-height: 44px; padding-inline: 0.3rem; }
  .reading-limit { max-width: 69ch; }
  .jump-pad { padding: 0.7rem 1.15rem; }
  .soft-corners { border-radius: 0.35rem; }
  [data-section-jump] summary { cursor: pointer; min-height: 44px; padding-block: 0.3rem; }
  .jump-list a { display: flex; align-items: center; min-height: 48px; padding-block: 0.5rem; }
  .tile-layout { position: relative; display: block; }
  .tile-space { padding: 1.1rem 2.5rem 1.1rem 1.1rem; }
  .tile-rule { border: 1px solid currentColor; }
  .tile-tap { min-height: 44px; }
  .link-plain { text-decoration: none; }
  .tile-rule:hover { text-decoration: underline; }
  .source-list a { display: inline-flex; align-items: center; min-height: 48px; padding-block: 0.5rem; }
  .next-layout { display: inline-flex; align-items: center; justify-content: space-between; gap: 1.75rem; }
  .next-pad { padding: 0.9rem 1.4rem; }
  .next-tap { min-height: 56px; }
  .pill-corners { border-radius: 2rem; }
  .copper-fill { background: var(--copper); color: var(--white); }
  .copper-fill:hover { background: var(--ink); }
  .footer-flow a { display: inline-flex; align-items: center; gap: 0.75rem; min-height: 48px; padding-block: 0.5rem; }
}

@layer responsive {
  @media (max-width: 1000px) {
    .page-shell { padding-inline: 2rem; }
    .hero-grid { gap: 2rem; }
    .section-space { padding: 2.5rem 2rem; }
    .footer-flow { align-items: flex-start; flex-direction: column; gap: 1rem; }
  }
  @media (max-width: 700px) {
    .page-shell { padding-inline: 1.15rem; }
    .masthead-flow { align-items: flex-start; flex-direction: column; gap: 0.25rem; }
    .masthead-space { padding-block: 1rem; }
    .guide-label { margin: 0; }
    .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
    .hero-space { padding-block: 1rem 2rem; }
    .hero-grid .clip-frame { max-width: 100%; }
    .hero-grid img[src$='ghk-cu-open-door.webp'] { aspect-ratio: 768 / 480; }
    .crumb-row { padding-block: 0.5rem; }
    .section-space { padding: 2rem 1.1rem; margin-block: 1rem; }
    .band-corners { border-radius: 0.5rem 1.5rem 0.5rem 0.5rem; }
    .route-grid { grid-template-columns: minmax(0, 1fr); }
    .jump-space { margin-bottom: 1rem; }
    .next-space { justify-content: stretch; margin-bottom: 2.5rem; }
    .next-layout { width: 100%; }
    .footer-space { padding-block: 1.5rem 2rem; }
    .source-rule { padding-left: 0.85rem; }
  }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation: none !important; transition: none !important; }
  }
  @media print {
    body { background: white; color: black; font-size: 12pt; }
    .page-shell { padding: 0; max-width: none; }
    .brief-tone { background: white; color: black; border: 1px solid black; }
    .hero-grid { display: block; }
    .clip-frame, .jump-space, .skip-link { display: none; }
    .section-space { padding: 1.5rem; }
    .copper-fill { background: white; color: black; border: 1px solid black; }
  }
}