/* Shared colour, type, and spacing scales. */
:root {
  color-scheme: light dark;

  --background: light-dark(#faf9f6, #000000);
  --surface-1: light-dark(#f3f1ec, #0a0a0a);
  --surface-2: light-dark(#ece9e2, #111111);
  --surface-3: light-dark(#e5e1d8, #161616);

  --text-primary: light-dark(#20201e, #f5f5f7);
  --text-secondary: light-dark(#50504a, #a1a1a6);
  --text-tertiary: light-dark(#585850, #86868b);

  --border-subtle: light-dark(rgb(0 0 0 / 0.18), rgb(255 255 255 / 0.1));
  --border-strong: light-dark(rgb(0 0 0 / 0.35), rgb(255 255 255 / 0.22));
  --focus-ring: light-dark(#81391f, #ffffff);

  --accent: light-dark(#914026, #d1795e);
  --accent-strong: light-dark(#914026, #b4573b);

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;

  --text-2xs: 0.6875rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 0.9375rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;

  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  --tracking-tight: -0.02em;
  --tracking-tighter: -0.04em;
  --tracking-wide: 0.1em;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  --page-max: 1200px;
  --page-gutter: clamp(20px, 4vw, 48px);
  --reading-width: 68ch;
  --radius-sm: 6px;

  --transition-fast: 180ms ease;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 280px;
  margin: 0;
  background: var(--background);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: 1.65;
  overflow-wrap: anywhere;
}

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

button,
a,
input,
select {
  font: inherit;
  color: inherit;
}

a {
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}

abbr[title] {
  text-decoration: underline dotted;
  text-underline-offset: 0.18em;
  cursor: help;
}

article p a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

a,
button,
input,
select,
summary,
[tabindex] {
  touch-action: manipulation;
}

button,
select,
input {
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  color: var(--text-primary);
}

button,
summary {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

button[data-busy] {
  cursor: progress;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: var(--space-4);
  left: -999px;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--text-primary);
  border-radius: var(--radius-sm);
  background: var(--text-primary);
  color: var(--background);
  font-weight: var(--weight-bold);
  text-decoration: none;
}

.skip-link:focus {
  left: var(--space-4);
}

.header-container,
main,
.footer-container {
  width: min(calc(100% - (var(--page-gutter) * 2)), var(--page-max));
  margin-inline: auto;
}

main {
  min-height: 65vh;
}

main,
article,
section {
  min-width: 0;
}

main:focus {
  outline: none;
}

main:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

:target {
  scroll-margin-top: 110px;
}

/* Keep a consistent reading rhythm between chapter sections. */
main section {
  margin-bottom: var(--space-9);
}

main section > h2 {
  margin: 0 0 var(--space-3);
  color: var(--text-primary);
  font-size: clamp(1.4rem, 2.2vw, 1.85rem);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tighter);
  line-height: 1.15;
}

main section > h2::after {
  content: '';
  display: block;
  width: 100%;
  margin-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

article {
  counter-reset: section;
}

article > section {
  counter-increment: section;
}

article > section > h2::before {
  content: counter(section, decimal-leading-zero) '\00a0\00b7\00a0';
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.62em;
  font-weight: var(--weight-medium);
  letter-spacing: 0.04em;
  vertical-align: 0.12em;
}

[data-page='not-found'] article > section > h2::before {
  content: none;
}

.site-header {
  z-index: 50;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--background);
}

.header-container {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.3em;
  color: var(--text-primary);
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  text-decoration: none;
}

.brand-accent {
  color: var(--text-secondary);
  font-weight: var(--weight-medium);
  white-space: nowrap;
}

.site-menu {
  order: 3;
  display: flex;
  width: 100%;
  min-width: 0;
  flex-basis: 100%;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.nav-link {
  position: relative;
  display: grid;
  grid-template-columns: 2rem auto;
  column-gap: var(--space-2);
  align-content: center;
  min-height: 56px;
  padding: var(--space-2) 0;
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  line-height: 1.25;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-link::after {
  display: none;
}

.nav-link[aria-current='page'] {
  color: var(--text-primary);
}

.nav-link[aria-current='page'] {
  padding-left: var(--space-3);
  border-left: 2px solid var(--accent-strong);
}

.nav-link[aria-current='page']::after {
  display: none;
}

.nav-link[aria-current='page'] .nav-num {
  color: var(--accent);
}

.nav-num {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-variant-numeric: tabular-nums;
}

.nav-range {
  white-space: nowrap;
}

.nav-title {
  grid-column: 1 / -1;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1.3;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
}

.header-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.header-link[aria-current='page'] {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.3em;
}

.menu-toggle-btn {
  min-width: 44px;
  padding: var(--space-2) var(--space-3);
  border-color: var(--border-subtle);
  background: transparent;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast);
}

:root[data-navigation='enhanced'] .menu-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

:root[data-navigation='enhanced'] .site-menu {
  display: none;
}

:root[data-navigation='enhanced'] .site-menu.is-open {
  display: flex;
}

.page-hero {
  padding: var(--space-7) 0 var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
}

.hero-overline,
.page-hero h1,
.hero-lede {
  grid-column: auto;
}

.hero-overline {
  margin: 0 0 var(--space-4);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  line-height: 1.3;
  text-transform: uppercase;
}

.page-hero h1 {
  max-width: 14ch;
  margin: 0 0 var(--space-5);
  font-size: clamp(2rem, 9vw, 2.75rem);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.hero-lede {
  max-width: 60ch;
  margin: 0;
  color: var(--text-secondary);
  font-size: clamp(1rem, 1.3vw, 1.125rem);
  line-height: 1.6;
}

.hero-figure {
  display: none;
  pointer-events: none;
  user-select: none;
}

.hero-figure::before {
  content: attr(data-figure);
  display: block;
  color: var(--surface-3);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.06em;
  line-height: 0.8;
  -webkit-text-stroke: 1px var(--border-subtle);
}

.context-panel {
  max-width: var(--reading-width);
  margin: var(--space-7) 0 var(--space-8);
  padding: 0 0 0 var(--space-5);
  border-left: 1px solid var(--border-strong);
}

.context-panel h2 {
  margin: 0 0 var(--space-2);
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.context-panel p {
  margin: 0;
  color: var(--text-secondary);
}

.glossary {
  max-width: var(--reading-width);
  margin: var(--space-5) 0 0;
  border-top: 1px solid var(--border-subtle);
}

.glossary dt {
  padding-top: var(--space-4);
  font-weight: var(--weight-semibold);
}

.glossary dd {
  margin: 0;
  padding: var(--space-2) 0 var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.page-contents {
  max-width: var(--reading-width);
  margin: var(--space-7) 0 var(--space-8);
  padding: 0 0 0 var(--space-5);
  border-left: 1px solid var(--border-strong);
}

.page-contents h2 {
  margin: 0 0 var(--space-3);
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.page-contents ol {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0 0 0 var(--space-4);
  color: var(--text-secondary);
}

.page-contents a {
  color: var(--text-secondary);
}

article > section > p {
  max-width: var(--reading-width);
}

.section-lede {
  max-width: var(--reading-width);
  margin: 0 0 var(--space-6);
  color: var(--text-secondary);
}

.prose-section {
  max-width: var(--reading-width);
  margin-bottom: var(--space-7);
}

.prose-section h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-tight);
}

.prose-section p {
  margin: 0 0 var(--space-4);
}

.prose-note {
  max-width: var(--reading-width);
  padding-left: var(--space-4);
  border-left: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: var(--text-base);
}

.stats-container {
  container-type: inline-size;
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--accent-strong);
}

.stat-card {
  display: grid;
  grid-template-rows: auto auto auto 1fr auto;
  min-width: 0;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.stat-card:not(:nth-child(3n + 1)) {
  padding-left: 0;
  border-left: 0;
}

.stat-value {
  order: -1;
  margin: 0 0 var(--space-4);
  font-size: clamp(2.25rem, 3.6vw, 3.4rem);
  font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.05em;
  line-height: 0.95;
}

.stat-value::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  margin-top: var(--space-4);
  background: var(--accent-strong);
}

.stat-metric {
  margin: 0 0 var(--space-2);
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  line-height: 1.35;
}

.stat-basis {
  margin: 0 0 var(--space-4);
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}

.stat-note {
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.stat-source {
  margin: var(--space-3) 0 0;
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

.timeline-spine {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline-explorer {
  display: grid;
  max-width: var(--reading-width);
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  margin: 0 0 var(--space-6);
  padding: var(--space-4);
  border: 1px solid var(--border-subtle);
  background: var(--surface-1);
}

.timeline-explorer label {
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
}

.timeline-explorer p {
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.timeline-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  padding-bottom: var(--space-6);
}

.timeline-node::before {
  display: none;
}

.timeline-node:last-child::before {
  display: none;
}

.node-marker {
  position: static;
  width: var(--space-5);
  height: 2px;
  margin-bottom: var(--space-3);
  transform: none;
  border: 0;
  border-radius: 0;
  background: var(--accent-strong);
}

.timeline-node:first-child .node-marker {
  background: var(--accent-strong);
}

.node-year-col {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: 0;
  text-align: left;
}

.node-year {
  display: block;
  color: var(--text-primary);
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
  letter-spacing: var(--tracking-tighter);
  line-height: 1;
}

.node-date {
  display: block;
  margin: 0;
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

.node-card {
  padding: 0 0 var(--space-6) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
}

.node-tag {
  margin: 0 0 var(--space-2);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.node-title {
  margin: 0 0 var(--space-3);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: 1.2;
}

.node-summary,
.node-significance {
  max-width: var(--reading-width);
  margin: 0 0 var(--space-3);
}

.node-significance {
  color: var(--text-secondary);
  font-size: var(--text-base);
}

.node-sources {
  margin: var(--space-4) 0 0;
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

.node-sources a {
  display: inline-block;
  margin-right: var(--space-2);
  padding-block: 5px;
}

.sources-dropdown {
  margin-top: var(--space-6);
}

.sources-dropdown .page-sources {
  padding: 0 var(--space-4);
  border-top: none;
}

.page-sources {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--border-subtle);
}

.source-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: var(--text-sm);
}

.source-item > * {
  min-width: 0;
}

.source-item a {
  display: inline-block;
  padding-block: 5px;
}

.source-org {
  font-weight: var(--weight-semibold);
}

.source-title {
  color: var(--text-secondary);
}

.source-title cite {
  font-style: normal;
}

.source-year {
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

.chart-figure {
  max-width: 720px;
  margin: 0 0 var(--space-4);
  padding: 0;
}

.chart-frame {
  padding: var(--space-4) 0 var(--space-3);
  border-top: 1px solid var(--border-subtle);
  overflow-x: auto;
}

.chart-hint {
  margin: var(--space-3) 0 0;
  color: var(--text-secondary);
  font-size: var(--text-xs);
}

.chart {
  display: block;
  width: 100%;
  min-width: 30rem;
  height: auto;
  overflow: visible;
}

.chart-bar,
.chart-node {
  fill: var(--accent);
}

.chart-route {
  stroke: var(--accent);
  stroke-width: 2;
}

.chart-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.chart-reference {
  stroke: var(--text-tertiary);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

.chart-axis {
  stroke: var(--border-strong);
  stroke-width: 1;
}

.chart-grid {
  stroke: var(--border-subtle);
  stroke-width: 1;
}

.chart-label {
  fill: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: var(--weight-medium);
}

.chart-value {
  fill: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.chart-meta,
.chart-tick {
  fill: var(--text-tertiary);
  font-family: var(--font-sans);
  font-size: 13px;
}

.chart-tick {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.chart-figure figcaption {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  max-width: var(--reading-width);
  padding-top: var(--space-3);
}

.chart-caption {
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--text-base);
  line-height: 1.5;
}

.chart-source {
  margin: 0;
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

.chart-source a {
  display: inline-block;
  margin-right: var(--space-2);
  padding-block: 5px;
}

/* Tables scroll locally on narrow screens without widening the page. */
.data-table {
  max-width: 960px;
  margin: var(--space-3) 0 var(--space-7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.data-table summary {
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}

.data-table summary::before {
  flex: none;
  width: 0;
  height: 0;
  margin-right: var(--space-3);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 7px solid currentColor;
  content: '';
  transition: transform var(--transition-fast);
}

.data-table[open] > summary::before {
  transform: rotate(90deg);
}

.data-table[open] summary {
  border-bottom: 1px solid var(--border-subtle);
}

.sources-dropdown summary h2 {
  display: inline;
  margin: 0;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
}

.sources-dropdown summary {
  justify-content: space-between;
  gap: var(--space-3);
  list-style: none;
}

.sources-dropdown summary::-webkit-details-marker {
  display: none;
}

.sources-dropdown summary::marker {
  content: '';
}

.sources-dropdown summary::after {
  display: grid;
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: var(--radius-sm);
  content: '⌄';
  font-size: 1.25rem;
  line-height: 1;
  transition: transform var(--transition-fast);
}

.sources-dropdown[open] summary::after {
  transform: rotate(180deg);
}

.table-scroll {
  overflow-x: auto;
  padding: 0 var(--space-4) var(--space-4);
}

table {
  width: 100%;
  min-width: 48rem;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

caption {
  padding: var(--space-4) 0;
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-align: left;
  text-transform: uppercase;
}

th,
td {
  padding: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--text-primary);
}

td {
  color: var(--text-secondary);
}

#live-status {
  color: var(--text-secondary);
  font-size: var(--text-base);
}

.data-empty {
  padding: var(--space-5) 0;
  color: var(--text-secondary);
}

.noscript-note {
  max-width: var(--reading-width);
  margin: 0 auto var(--space-6);
  padding: var(--space-5);
  border-left: 2px solid var(--text-primary);
  background: var(--surface-1);
}

.page-weight {
  min-height: 2.6em;
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  line-height: 1.5;
}

.reading-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.offline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.chapter-pager {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: var(--space-9);
  border-top: 1px solid var(--border-subtle);
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 92px;
  padding: var(--space-6) var(--space-5);
  text-decoration: none;
  transition: background var(--transition-fast);
}

.pager-prev {
  grid-column: 1;
  padding-left: 0;
  padding-bottom: 0;
}

.pager-next {
  grid-column: 1;
  align-items: flex-start;
  padding-right: 0;
  border-top: 1px solid var(--border-subtle);
  text-align: left;
}

.pager-dir {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.pager-prev .pager-dir::before {
  content: '\2190\00a0';
}

.pager-next .pager-dir::after {
  content: '\00a0\2192';
}

.pager-meta {
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}

.pager-name {
  color: var(--text-primary);
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: 1.25;
  transition: color var(--transition-fast);
}

.site-footer {
  margin-top: var(--space-9);
  padding: var(--space-6) 0 var(--space-5);
  border-top: 1px solid var(--border-subtle);
  background: var(--surface-1);
}

.footer-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  align-items: start;
}

.footer-utilities {
  display: grid;
  grid-column: 1 / -1;
  gap: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
}

.footer-utility {
  display: grid;
  min-width: 0;
  gap: var(--space-2);
}

.footer-utility-controls {
  display: grid;
  gap: var(--space-2);
}

.footer-utility h2 {
  margin: 0;
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.footer-utility p {
  max-width: 80ch;
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--text-xs);
}

.footer-utility .reading-actions,
.footer-utility .offline-actions {
  margin: 0;
}

.footer-utility-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-3);
}

.footer-meta {
  color: var(--text-secondary);
  font-size: var(--text-xs);
  line-height: 1.6;
}

.footer-meta p {
  margin: 0 0 var(--space-2);
}

.footer-meta strong {
  color: var(--text-primary);
}

.footer-nav {
  font-size: var(--text-xs);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav p {
  margin: 0;
}

.footer-nav a {
  display: inline-block;
  padding-block: var(--space-2);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

@container (min-width: 41rem) {
  .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .stat-card {
    padding: var(--space-6) var(--space-6) var(--space-6) 0;
    border-bottom: 0;
  }

  .stat-card:not(:nth-child(3n + 1)) {
    padding-left: var(--space-6);
    border-left: 1px solid var(--border-subtle);
  }
}

@media (min-width: 31.25rem) {
  .chart {
    min-width: 0;
  }

  .chart-hint {
    display: none;
  }
}

@media (min-width: 42rem) {
  .page-hero {
    position: relative;
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    padding: var(--space-8) 0 var(--space-7);
  }

  .hero-overline,
  .page-hero h1,
  .hero-lede {
    grid-column: 1 / span 9;
  }

  .page-hero h1 {
    max-width: 18ch;
    font-size: clamp(2.25rem, 4vw, 3.5rem);
  }

  .hero-figure {
    display: block;
    grid-column: 10 / span 3;
    grid-row: 1 / span 3;
    justify-self: end;
    align-self: start;
    margin: 0;
  }

  .context-panel {
    margin: var(--space-7) 0 var(--space-8);
  }

  .timeline-spine {
    --spine-x: calc(9rem + var(--space-7) / 2);
  }

  .timeline-node {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: var(--space-7);
    padding-bottom: var(--space-7);
  }

  .timeline-node::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: var(--spine-x);
    display: block;
    width: 1px;
    background: var(--border-subtle);
  }

  .timeline-node:last-child::before {
    bottom: auto;
    height: 1.6rem;
  }

  .node-marker {
    position: absolute;
    z-index: 1;
    top: 5px;
    left: var(--spine-x);
    width: 11px;
    height: 11px;
    margin: 0;
    transform: translateX(-50%);
    border: 2px solid var(--accent-strong);
    border-radius: 50%;
    background: var(--background);
  }

  .node-year-col {
    display: block;
    padding-top: 2px;
    text-align: right;
  }

  .node-date {
    margin-top: var(--space-2);
  }

  .node-card {
    padding: 0 0 var(--space-7) var(--space-5);
  }

  .source-item {
    grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(140px, 0.8fr);
    gap: var(--space-5);
  }

  .chapter-pager {
    grid-template-columns: 1fr 1fr;
  }

  .pager-prev {
    padding-bottom: var(--space-6);
  }

  .pager-next {
    grid-column: 2;
    align-items: flex-end;
    padding-right: 0;
    border-top: 0;
    border-left: 1px solid var(--border-subtle);
    text-align: right;
  }

  .footer-container {
    grid-template-columns: minmax(0, var(--reading-width)) auto;
    gap: var(--space-8);
  }

  .footer-utilities {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  }
}

@media (min-width: 75rem) {
  .footer-utility-controls {
    display: flex;
    align-items: center;
    gap: var(--space-4);
  }

  .footer-utility-controls h2 {
    flex: none;
  }
}

@media (min-width: 60rem) {
  .site-header {
    position: sticky;
    top: 0;
  }

  .header-container {
    flex-wrap: nowrap;
    gap: var(--space-6);
  }

  .brand {
    flex-wrap: nowrap;
    white-space: nowrap;
  }

  .menu-toggle-btn,
  :root[data-navigation='enhanced'] .menu-toggle-btn {
    display: none;
  }

  .site-menu,
  :root[data-navigation='enhanced'] .site-menu,
  :root[data-navigation='enhanced'] .site-menu.is-open {
    order: initial;
    display: flex;
    width: auto;
    flex-basis: auto;
    flex-direction: row;
    gap: var(--space-6);
    margin-bottom: 0;
    padding-top: 0;
    border-top: 0;
  }

  .site-nav {
    align-items: stretch;
    flex-direction: row;
    gap: var(--space-5);
  }

  .nav-link {
    width: 10.5rem;
    grid-template-columns: auto auto;
    min-height: 68px;
    padding: 0;
  }

  .nav-link::after {
    content: '';
    position: absolute;
    right: 0;
    bottom: -1px;
    left: 0;
    display: block;
    height: 1px;
    background: var(--accent-strong);
    opacity: 0;
    transition: opacity var(--transition-fast);
  }

  .nav-link[aria-current='page'] {
    padding-left: 0;
    border-left: 0;
  }

  .nav-link[aria-current='page']::after {
    opacity: 1;
  }

  .nav-title {
    font-size: var(--text-2xs);
  }

  .header-actions {
    justify-content: flex-end;
    padding-top: 0;
    padding-left: var(--space-6);
    border-top: 0;
    border-left: 1px solid var(--border-subtle);
  }
}

@media (max-width: 25rem) {
  .brand {
    gap: 0.25em;
    font-size: var(--text-sm);
  }
}

@media (hover: hover) and (pointer: fine) {
  article p a:hover,
  .header-link:hover,
  .footer-nav a:hover {
    color: var(--accent);
  }

  .nav-link:hover,
  .page-contents a:hover {
    color: var(--text-primary);
  }

  .menu-toggle-btn:hover {
    border-color: var(--border-strong);
    background: var(--surface-2);
  }

  .pager-link:hover {
    background: var(--surface-1);
  }

  .pager-link:hover .pager-name {
    color: var(--accent);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  .nav-link[aria-current='page'],
  .header-link[aria-current='page'] {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 0.25em;
  }

  .nav-link[aria-current='page']::after {
    height: 3px;
    background: Highlight;
  }

  .chart-bar,
  .chart-node {
    fill: CanvasText;
  }

  .chart-line,
  .chart-route,
  .chart-axis {
    stroke: CanvasText;
  }

  button,
  input,
  select {
    border: 1px solid ButtonText;
  }
}

@media print {
  :root {
    color-scheme: light;
  }

  .header-actions,
  .footer-utilities,
  .menu-toggle-btn,
  #refresh-live,
  #page-weight {
    display: none !important;
  }

  .site-header {
    position: static;
  }

  .chart {
    min-width: 0;
  }
}