/* ========================================
   HAND Protocol — Discovery Docs
   Shared stylesheet for research & vision pages
   Design language inherited from foundation-campaign,
   tuned for long-form reading.
   ======================================== */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* Inherited brand tokens */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8F7F4;
  --color-bg-warm: #FBF8F1;
  --color-bg-dark: #0C1220;
  --color-bg-dark-alt: #111827;
  --color-bg-cta: #0F172A;

  --color-text: #111827;
  --color-text-secondary: #4B5563;
  --color-text-muted: #6B7280;
  --color-text-faint: #6B7280;
  --color-text-on-dark: #F9FAFB;
  --color-text-on-dark-secondary: #CBD5E1;

  --color-accent: #D97706;
  --color-accent-hover: #B45309;
  --color-accent-warm: #F59E0B;
  --color-accent-light: #FEF3C7;
  --color-accent-glow: rgba(217, 119, 6, 0.15);
  --color-accent-tint: #FEF9EC;

  --color-bg-cta-step-2: #1E293B;

  --color-teal: #0D9488;
  --color-teal-light: #CCFBF1;
  --color-teal-dark: #0F766E;
  --color-teal-tint: #F0FDFA;

  --color-rose: #BE185D;
  --color-rose-light: #FCE7F3;

  --color-warning: #DC2626;
  --color-warning-dark: #B91C1C;
  --color-warning-tint: #FEF2F2;
  --color-warning-border: #FECACA;

  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  --color-border-strong: #D1D5DB;
  --color-card-shadow: rgba(15, 23, 42, 0.04);
  --color-card-shadow-hover: rgba(15, 23, 42, 0.08);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  --container-max: 1200px;
  --container-doc: 760px;
  --container-wide: 1040px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* ---- QF citation link with hover tooltip ---- */
.qf-link {
  position: relative;
  color: var(--color-accent);
  border-bottom: 1px dotted var(--color-accent);
  text-decoration: none;
  cursor: help;
  transition: color 150ms ease, border-bottom-color 150ms ease, border-bottom-style 150ms ease;
  font-weight: inherit;
}
.qf-link:hover,
.qf-link:focus-visible {
  color: var(--color-accent-hover);
  border-bottom-color: var(--color-accent-hover);
  border-bottom-style: solid;
  outline: none;
}
.qf-link__tip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 0.625rem 0.875rem;
  background: var(--color-bg-cta);
  color: var(--color-text-on-dark);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0;
  text-align: left;
  text-transform: none;
  width: max-content;
  max-width: 280px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease, visibility 0s linear 180ms;
  z-index: 60;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18);
  white-space: normal;
}
.qf-link__tip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--color-bg-cta);
}
.qf-link__tip strong { color: var(--color-text-on-dark); font-weight: 600; }
.qf-link__tip-meta {
  display: block;
  margin-top: 4px;
  color: var(--color-text-on-dark-secondary);
  font-size: 0.6875rem;
  font-style: italic;
}
.qf-link:hover .qf-link__tip,
.qf-link:focus-visible .qf-link__tip {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  transition: opacity 180ms ease, transform 180ms ease, visibility 0s;
}
@media (max-width: 640px) {
  .qf-link__tip { left: 0; transform: translateX(0) translateY(4px); max-width: min(280px, calc(100vw - 32px)); }
  .qf-link__tip::after { left: 16px; transform: none; }
  .qf-link:hover .qf-link__tip,
  .qf-link:focus-visible .qf-link__tip { transform: translateX(0) translateY(0); }
}

/* ---- Skip-link (keyboard accessibility) ---- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-lg);
  z-index: 100;
  padding: 0.625rem 1rem;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
  transition: top 180ms ease;
}
.skip-link:focus {
  top: var(--space-sm);
  outline: 3px solid rgba(255, 255, 255, 0.55);
  outline-offset: 2px;
}

/* ---- Base ---- */
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; }

/* ---- Layout containers ---- */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-lg); }
.container--doc { max-width: var(--container-doc); }
.container--wide { max-width: var(--container-wide); }

@media (min-width: 768px) {
  .container { padding: 0 var(--space-2xl); }
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5 {
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.022em;
  color: var(--color-text);
}
h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.625rem, 3.2vw, 2.25rem); margin-top: var(--space-3xl); margin-bottom: var(--space-lg); }
h3 { font-size: clamp(1.15rem, 2vw, 1.375rem); margin-top: var(--space-2xl); margin-bottom: var(--space-md); }
h4 { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); font-weight: 600; margin-top: var(--space-xl); margin-bottom: var(--space-sm); }

p { color: var(--color-text-secondary); line-height: 1.75; margin-bottom: var(--space-md); }
.prose p { font-size: 1.0625rem; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--color-text); font-weight: 600; }
.prose em { font-style: italic; color: var(--color-text); }
.prose a { color: var(--color-accent); border-bottom: 1px solid var(--color-accent-light); transition: border-color var(--transition-fast); }
.prose a:hover { border-bottom-color: var(--color-accent); }
.prose ul, .prose ol { margin: var(--space-md) 0 var(--space-lg) var(--space-lg); }
.prose ul li, .prose ol li { color: var(--color-text-secondary); margin-bottom: var(--space-sm); position: relative; padding-left: var(--space-md); line-height: 1.7; }
.prose ul li::before { content: ""; position: absolute; left: 0; top: 0.7em; width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); }
.prose ol { counter-reset: list-counter; }
.prose ol li { counter-increment: list-counter; }
.prose ol li::before { content: counter(list-counter) "."; position: absolute; left: 0; top: 0; color: var(--color-accent); font-weight: 600; font-variant-numeric: tabular-nums; }
.prose code { font-family: var(--font-mono); font-size: 0.875em; background: var(--color-bg-alt); padding: 0.125em 0.375em; border-radius: var(--radius-sm); color: var(--color-text); }

.text--lg { font-size: 1.1875rem; line-height: 1.7; }
.text--sm { font-size: 0.875rem; }
.text--mono { font-family: var(--font-mono); font-feature-settings: "tnum" 1; }
.text--muted { color: var(--color-text-muted); }
.text--accent { color: var(--color-accent); }

/* ---- Tiny utility helpers (used by hero/title accents) ---- */
.u-accent { color: var(--color-accent); }
.u-mt-lg { margin-top: var(--space-lg); }

/* Screen-reader-only utility (visually hidden, AT-reachable) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 44px;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}
.btn--primary { background: var(--color-accent); color: #fff; box-shadow: 0 1px 2px rgba(0,0,0,0.05); }
.btn--primary:hover { background: var(--color-accent-hover); transform: translateY(-1px); box-shadow: 0 6px 18px var(--color-accent-glow); }
.btn--ghost { background: transparent; color: var(--color-text); border: 1.5px solid var(--color-border-strong); }
.btn--ghost:hover { border-color: var(--color-text); }
.btn--dark { background: var(--color-bg-cta); color: var(--color-text-on-dark); }
.btn--dark:hover { background: var(--color-bg-cta-step-2); transform: translateY(-1px); }
.btn--sm { min-height: 40px; padding: 0.5rem 1.125rem; font-size: 0.8125rem; }
.btn--lg { padding: 0.875rem 2rem; font-size: 1rem; }

/* ---- Navigation ---- */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.85); backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px); border-bottom: 1px solid var(--color-border-light); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: var(--space-lg); }
.nav__logo { display: flex; align-items: center; gap: var(--space-sm); font-weight: 700; font-size: 0.9375rem; letter-spacing: -0.01em; color: var(--color-text); }
.nav__logo-icon { width: 26px; height: 26px; color: var(--color-accent); }
.nav__crumbs { display: none; align-items: center; gap: var(--space-sm); font-size: 0.875rem; color: var(--color-text-muted); }
.nav__crumbs a { transition: color var(--transition-fast); }
.nav__crumbs a:hover { color: var(--color-accent); }
.nav__crumb-sep { opacity: 0.5; }
.nav__crumb-current { color: var(--color-text); font-weight: 500; }
.nav__actions { display: flex; align-items: center; gap: var(--space-sm); }
.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-xl);
  flex: 1;
  justify-content: center;
}
.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}
.nav__link:hover { color: var(--color-accent); }
@media (min-width: 768px) {
  .nav__crumbs { display: flex; }
}
@media (min-width: 1024px) {
  .nav__crumbs { display: none; }
  .nav__links { display: flex; }
}

/* ---- Sub-nav: discovery doc switcher (sticky under main nav) ---- */
.subnav {
  position: sticky;
  top: 64px;
  z-index: 49;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--color-border-light);
}
.subnav__inner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  height: 48px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.subnav__inner::-webkit-scrollbar { display: none; }
.subnav__hub {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  white-space: nowrap;
  padding-right: var(--space-md);
  border-right: 1px solid var(--color-border);
  transition: color var(--transition-fast);
  flex-shrink: 0;
}
.subnav__hub:hover { color: var(--color-accent); }
.subnav__hub svg { transition: transform var(--transition-fast); }
.subnav__hub:hover svg { transform: translateX(-2px); }
.subnav__pills {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.subnav__pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}
.subnav__pill:hover {
  color: var(--color-text);
  background: var(--color-bg-alt);
}
.subnav__pill--active {
  background: var(--color-bg-cta);
  color: #fff;
}
.subnav__pill--active:hover {
  background: var(--color-bg-cta);
  color: #fff;
}
.subnav__pill-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  opacity: 0.55;
  font-variant-numeric: tabular-nums;
}
.subnav__pill--active .subnav__pill-num { opacity: 0.7; }

/* ---- Pager: prev/next cards at bottom of docs ---- */
.pager {
  display: grid;
  gap: var(--space-md);
  margin: var(--space-3xl) 0 var(--space-xl);
}
.pager__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  text-decoration: none;
  min-height: 110px;
}
.pager__item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-card-shadow-hover);
}
.pager__item--next { text-align: right; align-items: flex-end; }
.pager__direction {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-weight: 700;
}
.pager__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.015em;
  margin: 0;
  line-height: 1.3;
}
.pager__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.4;
}
.pager__item--placeholder {
  background: transparent;
  border-style: dashed;
  border-color: var(--color-border-light);
  pointer-events: none;
  opacity: 0.45;
}
@media (min-width: 720px) {
  .pager { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
}

/* On mobile, only the sub-nav stays sticky; the main nav scrolls away
   so the reading area isn't squeezed by two stacked bars. */
@media (max-width: 640px) {
  .nav { position: relative; }
  .subnav { top: 0; }
  .subnav__inner { height: 44px; }
  .subnav__hub { padding-right: var(--space-sm); }
}

/* ---- Page header (doc top) ---- */
.doc-header { padding: var(--space-3xl) 0 var(--space-2xl); position: relative; overflow: hidden; }
.doc-header__inner { position: relative; z-index: 1; }
.doc-header__bg { position: absolute; inset: 0; pointer-events: none; opacity: 0.5; }
.doc-header__bg::before {
  content: "";
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 600px;
  background: radial-gradient(ellipse at center, var(--color-accent-glow), transparent 70%);
  filter: blur(40px);
}
.doc-header__eyebrow { display: inline-flex; align-items: center; gap: var(--space-sm); padding: 0.375rem 0.875rem; background: var(--color-accent-light); color: var(--color-accent-hover); border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: var(--space-lg); }
.doc-header__eyebrow-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); }
.doc-header__title { margin-bottom: var(--space-lg); }
.doc-header__lede { font-size: 1.25rem; line-height: 1.6; color: var(--color-text-secondary); max-width: 60ch; }
.doc-header__meta { display: flex; flex-wrap: wrap; gap: var(--space-xl); margin-top: var(--space-2xl); padding-top: var(--space-xl); border-top: 1px solid var(--color-border-light); }
.doc-header__meta-item { display: flex; flex-direction: column; gap: 2px; }
.doc-header__meta-label { font-size: 0.6875rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-faint); font-weight: 600; }
.doc-header__meta-value { font-size: 0.9375rem; color: var(--color-text); font-weight: 500; }

/* ---- TOC ---- */
.toc { padding: var(--space-xl); background: var(--color-bg-alt); border-radius: var(--radius-lg); border: 1px solid var(--color-border-light); margin-bottom: var(--space-3xl); }
.toc__title { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); font-weight: 600; margin-bottom: var(--space-md); }
.toc__list { display: flex; flex-direction: column; gap: var(--space-xs); }
.toc__item { display: flex; align-items: center; gap: var(--space-sm); padding: var(--space-xs) 0; font-size: 0.9375rem; color: var(--color-text-secondary); transition: color var(--transition-fast); }
.toc__item:hover { color: var(--color-accent); }
.toc__item[data-active="true"] { color: var(--color-accent); font-weight: 600; }
.toc__item[data-active="true"] .toc__item-num { color: var(--color-accent); }
.toc__item-num { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-text-faint); font-variant-numeric: tabular-nums; min-width: 24px; transition: color var(--transition-fast); }

/* ---- Section ---- */
.section { padding: var(--space-2xl) 0; }
.section + .section { padding-top: 0; }
.section__header { margin-bottom: var(--space-xl); }
.section__eyebrow { display: inline-block; font-size: 0.6875rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-accent); font-weight: 700; margin-bottom: var(--space-sm); }
.section__title { margin: 0; }
.section__subtitle { font-size: 1.125rem; color: var(--color-text-secondary); margin-top: var(--space-sm); max-width: 60ch; }

/* ---- Comparison cards (orgs / models) ---- */
.card-grid { display: grid; gap: var(--space-lg); margin: var(--space-xl) 0; }
.card-grid--2 { grid-template-columns: 1fr; }
.card-grid--3 { grid-template-columns: 1fr; }
@media (min-width: 720px) {
  .card-grid--2 { grid-template-columns: repeat(2, 1fr); }
  .card-grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .card-grid--3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.card:hover { transform: translateY(-2px); border-color: var(--color-border-strong); box-shadow: 0 8px 24px var(--color-card-shadow-hover); }
.card--feature { background: var(--color-bg-warm); border-color: var(--color-accent-light); }
.card--dark { background: var(--color-bg-cta); border-color: transparent; color: var(--color-text-on-dark); }
.card--dark .card__title, .card--dark .card__meta-value { color: var(--color-text-on-dark); }
.card--dark .card__desc, .card--dark .card__meta-label { color: var(--color-text-on-dark-secondary); }
.card__header { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-md); }
.card__title { font-size: 1.125rem; font-weight: 700; letter-spacing: -0.015em; margin: 0; }
.card__subtitle { font-size: 0.8125rem; color: var(--color-text-muted); font-weight: 500; margin-top: 2px; }
.card__tag { display: inline-block; font-size: 0.6875rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; padding: 0.25rem 0.625rem; border-radius: var(--radius-full); background: var(--color-bg-alt); color: var(--color-text-secondary); flex-shrink: 0; }
.card__tag--accent { background: var(--color-accent-light); color: var(--color-accent-hover); }
.card__tag--teal { background: var(--color-teal-light); color: var(--color-teal-dark); }
.card__tag--rose { background: var(--color-rose-light); color: var(--color-rose); }
.card__desc { font-size: 0.9375rem; line-height: 1.65; color: var(--color-text-secondary); }
.card__meta { display: grid; grid-template-columns: auto 1fr; gap: var(--space-xs) var(--space-md); margin-top: auto; padding-top: var(--space-md); border-top: 1px solid var(--color-border-light); font-size: 0.8125rem; }
.card__meta-label { color: var(--color-text-muted); font-weight: 500; }
.card__meta-value { color: var(--color-text); font-weight: 500; }
.card__url { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-text-faint); word-break: break-all; }

/* ---- Doc cards (the three-doc grid on the hub) ---- */
.doc-cards { display: grid; gap: var(--space-lg); margin: var(--space-xl) 0; }
@media (min-width: 720px) { .doc-cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .doc-cards { grid-template-columns: repeat(3, 1fr); } }

.doc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl) var(--space-xl);
  text-decoration: none;
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  min-height: 380px;
}
.doc-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0.08);
  transform-origin: left;
  transition: transform 500ms cubic-bezier(0.2, 0.9, 0.3, 1);
}
.doc-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px var(--color-card-shadow-hover);
}
.doc-card:hover::before { transform: scaleX(1); }
.doc-card--vision::before { background: var(--color-accent); }
.doc-card--models::before { background: var(--color-teal); }
.doc-card--landscape::before { background: var(--color-rose); }

.doc-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}
.doc-card__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-faint);
  letter-spacing: 0.12em;
  font-weight: 600;
}
.doc-card__icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}
.doc-card--vision .doc-card__icon { background: var(--color-accent-light); color: var(--color-accent-hover); }
.doc-card--models .doc-card__icon { background: var(--color-teal-light); color: var(--color-teal-dark); }
.doc-card--landscape .doc-card__icon { background: var(--color-rose-light); color: var(--color-rose); }
.doc-card:hover .doc-card__icon { transform: scale(1.08); }

.doc-card__title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.022em;
  color: var(--color-text);
  line-height: 1.2;
  margin: 0 0 var(--space-sm);
}
.doc-card__kicker {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-md);
  letter-spacing: 0.01em;
}
.doc-card__desc {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  flex: 1;
  margin: 0 0 var(--space-lg);
}
.doc-card__meta {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: var(--space-md);
  row-gap: 4px;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
  font-size: 0.8125rem;
}
.doc-card__meta dt { color: var(--color-text-muted); font-weight: 500; }
.doc-card__meta dd { color: var(--color-text); font-weight: 500; margin: 0; }
.doc-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9375rem;
}
.doc-card--models .doc-card__cta { color: var(--color-teal); }
.doc-card--landscape .doc-card__cta { color: var(--color-rose); }
.doc-card__cta svg { transition: transform var(--transition-base); }
.doc-card:hover .doc-card__cta svg { transform: translateX(6px); }

/* ---- Route cards (reading routes by reader-role) ---- */
.route-cards { display: grid; gap: var(--space-lg); margin: var(--space-xl) 0; }
@media (min-width: 720px) { .route-cards { grid-template-columns: repeat(3, 1fr); } }

.route-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-xl);
  background: linear-gradient(180deg, var(--color-bg-warm) 0%, var(--color-bg) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  overflow: hidden;
}
.route-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
  box-shadow: 0 16px 36px var(--color-card-shadow-hover);
}
.route-card__role {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-weight: 700;
}
.route-card__role::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
}
.route-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.018em;
  color: var(--color-text);
  margin: 0;
  line-height: 1.3;
}
.route-card__body {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
  margin: 0;
  flex: 1;
}
.route-card__path {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
  font-size: 0.75rem;
}
.route-card__step {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}
.route-card__step--first {
  background: var(--color-bg-cta);
  color: #fff;
  border-color: var(--color-bg-cta);
}
.route-card__step--optional {
  border-style: dashed;
  color: var(--color-text-faint);
}
.route-card__step-sep {
  color: var(--color-text-faint);
  font-size: 0.75rem;
  opacity: 0.6;
}

/* ---- Callout / pull quote / lesson ---- */
.callout { display: flex; gap: var(--space-md); padding: var(--space-xl); border-radius: var(--radius-lg); margin: var(--space-xl) 0; background: var(--color-bg-warm); border: 1px solid var(--color-accent-light); }
.callout__icon { flex-shrink: 0; width: 28px; height: 28px; color: var(--color-accent); }
.callout__body h4 { margin-top: 0; color: var(--color-accent-hover); }
.callout__body p { color: var(--color-text); margin-bottom: 0; }
.callout--insight { background: linear-gradient(135deg, var(--color-bg-warm) 0%, var(--color-accent-tint) 100%); }
.callout--warning { background: var(--color-warning-tint); border-color: var(--color-warning-border); }
.callout--warning .callout__icon { color: var(--color-warning); }
.callout--warning .callout__body h4 { color: var(--color-warning-dark); }
.callout--teal { background: var(--color-teal-tint); border-color: var(--color-teal-light); }
.callout--teal .callout__icon { color: var(--color-teal); }
.callout--teal .callout__body h4 { color: var(--color-teal-dark); }

.pull-quote {
  font-size: 1.5rem;
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--color-text);
  margin: var(--space-2xl) 0;
  padding: 0 0 0 var(--space-xl);
  border-left: 3px solid var(--color-accent);
  font-family: var(--font-serif);
  font-style: italic;
}
.pull-quote__cite { display: block; font-size: 0.875rem; font-style: normal; font-family: var(--font-sans); color: var(--color-text-muted); margin-top: var(--space-sm); font-weight: 400; }

/* ---- Comparison table ---- */
.table-wrap { overflow-x: auto; margin: var(--space-xl) 0; border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.compare { width: 100%; border-collapse: collapse; font-size: 0.9375rem; min-width: 600px; }
.compare th, .compare td { padding: var(--space-md) var(--space-lg); text-align: left; vertical-align: top; }
.compare thead th { background: var(--color-bg-alt); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); font-weight: 600; border-bottom: 1px solid var(--color-border); }
.compare tbody tr { border-bottom: 1px solid var(--color-border-light); }
.compare tbody tr:last-child { border-bottom: none; }
.compare tbody td { color: var(--color-text-secondary); }
.compare tbody td:first-child { color: var(--color-text); font-weight: 600; }
.compare tbody tr:hover { background: var(--color-bg-alt); }

/* ---- Key-value list (replaces hero-metric template for factual data) ---- */
.key-value {
  margin: var(--space-xl) 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  column-gap: var(--space-xl);
  row-gap: var(--space-sm);
  align-items: baseline;
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
}
.key-value dt {
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.9375rem;
  line-height: 1.5;
}
.key-value dd {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}
@media (max-width: 640px) {
  .key-value {
    grid-template-columns: 1fr;
    row-gap: 4px;
    padding: var(--space-md) var(--space-lg);
  }
  .key-value dd { margin-bottom: var(--space-sm); }
  .key-value dd:last-child { margin-bottom: 0; }
}

/* ---- Footnotes & citations ---- */
.footnotes { margin-top: var(--space-3xl); padding-top: var(--space-xl); border-top: 1px solid var(--color-border); font-size: 0.875rem; color: var(--color-text-muted); }
.footnotes h4 { color: var(--color-text-muted); margin-top: 0; }
.footnotes ol { counter-reset: fn; margin-left: 0; }
.footnotes li { padding-left: var(--space-xl); position: relative; line-height: 1.55; counter-increment: fn; margin-bottom: var(--space-sm); }
.footnotes li::before { content: counter(fn); position: absolute; left: 0; top: 0; font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-accent); font-weight: 700; }
.fn-ref { font-size: 0.7em; vertical-align: super; color: var(--color-accent); margin-left: 2px; font-weight: 600; }

/* ---- Story timeline (vertical decline narrative for time-banking) ---- */
.story-timeline {
  position: relative;
  list-style: none;
  margin: var(--space-2xl) 0;
  padding: 0 0 0 calc(var(--space-md) + 8px);
  counter-reset: timeline-step;
}
.story-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--color-accent) 0%,
    var(--color-accent) 35%,
    var(--color-text-muted) 80%,
    var(--color-border) 100%
  );
}
.story-timeline__item {
  position: relative;
  padding-bottom: var(--space-2xl);
  counter-increment: timeline-step;
}
.story-timeline__item:last-child { padding-bottom: 0; }
.story-timeline__marker {
  position: absolute;
  left: calc(-1 * (var(--space-md) + 8px) + 1px);
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-bg);
  z-index: 1;
}
/* Markers desaturate as the timeline progresses, reinforcing the decline */
.story-timeline__item:nth-child(n+5) .story-timeline__marker {
  background: var(--color-text-muted);
}
.story-timeline__item:nth-child(n+7) .story-timeline__marker {
  background: var(--color-border-strong, var(--color-border));
}
.story-timeline__item--end .story-timeline__marker {
  background: transparent;
  border: 2px solid var(--color-text-muted);
}
.story-timeline__year {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 6px;
  display: block;
}
.story-timeline__item:nth-child(n+5) .story-timeline__year {
  color: var(--color-text-muted);
}
.story-timeline__title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.018em;
  color: var(--color-text);
  margin: 0 0 var(--space-sm);
  line-height: 1.25;
}
.story-timeline__body {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0 0 var(--space-sm);
}
.story-timeline__chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  line-height: 1.5;
}
@media (min-width: 640px) {
  .story-timeline { padding-left: var(--space-2xl); }
  .story-timeline::before { left: calc(var(--space-2xl) - var(--space-md) + 1px); }
  .story-timeline__marker { left: calc(-1 * var(--space-md)); }
}

/* ---- Diagram boxes (for vision doc) ---- */
.diagram { padding: var(--space-2xl); background: var(--color-bg-alt); border-radius: var(--radius-lg); margin: var(--space-xl) 0; overflow-x: auto; }
.flow { display: flex; align-items: center; gap: var(--space-md); flex-wrap: wrap; }
.flow__node { flex: 1; min-width: 180px; padding: var(--space-md) var(--space-lg); background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-md); text-align: center; font-size: 0.9375rem; font-weight: 500; }
.flow__node--accent { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }
.flow__arrow { font-size: 1.25rem; color: var(--color-text-faint); }

/* ---- Footer ---- */
/* Unified footer — mirrors foundation-campaign so the site reads
   as one family. Three columns on desktop; stacks on mobile. */
.footer {
  background: var(--color-bg-dark);
  padding: var(--space-3xl) 0;
  margin-top: var(--space-4xl);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.footer__inner {
  display: grid;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}
@media (min-width: 768px) {
  .footer__inner {
    grid-template-columns: 1fr auto;
    gap: var(--space-4xl);
  }
}
.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-text-on-dark);
  margin-bottom: var(--space-md);
}
.footer__tagline {
  font-size: 0.875rem;
  color: var(--color-text-on-dark-secondary);
  max-width: 300px;
  margin-bottom: var(--space-sm);
}
.footer__location {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}
.footer__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}
@media (min-width: 640px) {
  .footer__links {
    grid-template-columns: repeat(3, auto);
    gap: var(--space-2xl);
  }
}
.footer__col h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  margin-top: 0;
}
.footer__col a {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-on-dark-secondary);
  padding: 4px 0;
  transition: color var(--transition-fast);
}
.footer__col a:hover { color: var(--color-text-on-dark); }
.footer__bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.footer__bottom p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.6;
}
.footer__bottom a {
  color: inherit;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-bottom-color var(--transition-fast);
}
.footer__bottom a:hover {
  color: var(--color-text-on-dark);
  border-bottom-color: var(--color-text-on-dark);
}
@media (min-width: 720px) {
  .footer__inner { grid-template-columns: 1fr auto; align-items: start; }
}

/* ---- Utility ---- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 600ms ease, transform 600ms ease; }
.reveal.in { opacity: 1; transform: translateY(0); }
.hr { height: 1px; background: var(--color-border-light); border: 0; margin: var(--space-2xl) 0; }
.divider-dot { display: inline-block; width: 4px; height: 4px; border-radius: 50%; background: var(--color-text-faint); margin: 0 var(--space-sm); vertical-align: middle; }
.scroll-shadow { box-shadow: 0 4px 12px var(--color-card-shadow); }

/* ---- Mobile tuning ---- */
@media (max-width: 640px) {
  .doc-header { padding: var(--space-2xl) 0 var(--space-xl); }
  .doc-header__lede { font-size: 1.0625rem; }
  .doc-header__meta { flex-direction: column; gap: var(--space-md); }
  .card { padding: var(--space-lg); }
  .callout { padding: var(--space-lg); flex-direction: column; gap: var(--space-sm); }
  .pull-quote { font-size: 1.25rem; padding-left: var(--space-lg); }
  h2 { margin-top: var(--space-2xl); }
}

/* ---- Print ---- */
@media print {
  .nav, .footer, .btn { display: none; }
  body { font-size: 11pt; }
  .card, .callout { break-inside: avoid; }
}

/* ---- Reduced-motion override ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
  .reveal.in {
    opacity: 1 !important;
    transform: none !important;
  }
  .doc-card:hover,
  .route-card:hover,
  .pager__item:hover,
  .card:hover,
  .backstory-card:hover {
    transform: none !important;
  }
  .doc-card:hover .doc-card__cta svg,
  .doc-card::before {
    transform: none !important;
    transition: none !important;
  }
}