* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

.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;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  overflow-x: clip;
  background: var(--page);
  color: var(--ink);
  font-family: "Nunito", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

i {
  line-height: 1;
}

a:focus-visible,
button:focus-visible,
.chart-viewport:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 4px;
}

.skip {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: 50;
  transform: translateY(-140%);
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
}

.skip:focus {
  transform: translateY(0);
}

.page {
  min-height: 100vh;
  width: min(1320px, calc(100% - (var(--gutter-page) * 2)));
  margin: 0 auto;
  padding: 42px 0 88px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-inline: var(--gutter-content);
  margin-bottom: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  color: var(--ink);
  font-weight: 800;
  line-height: 1.05;
}

.brand i {
  color: var(--series-a);
  font-size: 1.22rem;
  opacity: 0.9;
}

.top-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  min-width: 0;
}

.icon-button {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: var(--paper);
  color: var(--series-a);
  box-shadow: 0 14px 32px var(--shadow-medium);
  cursor: pointer;
}

main {
  display: grid;
  gap: 56px;
}

.hero,
.intro-grid,
.method-note {
  padding-inline: var(--gutter-content);
}

.eyebrow,
.step-kicker,
.chart-kicker {
  margin: 0;
  color: var(--faded);
  font-size: 1rem;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Raleway", ui-sans-serif, system-ui, sans-serif;
  font-weight: 760;
  line-height: 1.04;
  letter-spacing: 0;
  text-wrap: balance;
}

h1 {
  max-width: 840px;
  margin-top: 10px;
  font-size: 4.8rem;
}

.lede {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--subtle);
  font-size: 1.12rem;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.stat-panel {
  min-height: 148px;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 20px;
  align-content: center;
  padding: 30px 34px;
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  box-shadow: 0 18px 46px var(--shadow-soft);
}

.stat-panel:nth-child(2) {
  background: var(--soft-b);
}

.stat-panel:nth-child(3) {
  background: var(--soft-d);
}

.stat-panel i {
  grid-row: 1 / span 2;
  align-self: center;
  color: var(--series-a);
  font-size: 1.8rem;
  opacity: 0.72;
}

.stat-panel strong {
  display: block;
  color: var(--ink);
  font-size: 2rem;
  line-height: 1;
}

.stat-panel span {
  margin-top: 7px;
  color: var(--subtle);
}

.story-shell {
  display: grid;
  grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
  padding-inline: var(--gutter-content);
  padding-block-end: 58vh;
}

.steps {
  display: grid;
  gap: 0;
}

.step {
  min-height: 72vh;
  display: grid;
  align-content: center;
  gap: 14px;
  opacity: 0.42;
  transition: opacity 180ms ease;
}

.step.is-active {
  opacity: 1;
}

.step h2 {
  font-size: 2.1rem;
}

.step p:not(.step-kicker) {
  margin: 0;
  color: var(--subtle);
  font-size: 1.04rem;
}

.visual {
  position: sticky;
  top: 34px;
  min-width: 0;
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-rows: minmax(460px, 1fr) auto;
  align-content: center;
  gap: 22px;
  margin: 0;
}

.visual.has-tools {
  grid-template-rows: auto minmax(460px, 1fr) auto;
}

.visual-controls {
  display: none;
  max-width: 680px;
  min-width: 0;
}

.visual.has-tools .visual-controls {
  display: block;
}

.visual-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 0;
}

.tool-chip {
  min-height: 32px;
  padding: 7px 13px;
  border: 0;
  border-radius: 999px;
  background: var(--panel-quiet);
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
  cursor: pointer;
}

.tool-chip:hover,
.tool-chip:focus-visible,
.tool-chip.is-locked {
  background: var(--accent);
  color: var(--accent-ink);
}

.chart-viewport {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}

.visual.is-map .chart-viewport {
  cursor: grab;
  touch-action: none;
}

.visual.is-map .chart-viewport.is-panning {
  cursor: grabbing;
}

.chart-viewport::-webkit-scrollbar {
  display: none;
}

.chart,
.chart-canvas {
  display: block;
  width: 100%;
  min-width: 640px;
  height: 520px;
}

.chart-canvas {
  touch-action: manipulation;
}

.chart-canvas.has-article {
  cursor: pointer;
}

.chart-surface-hidden {
  display: none !important;
}

.axis text,
.axis-label,
.chart-label {
  fill: var(--axis-label);
  font-family: "Nunito", ui-sans-serif, system-ui, sans-serif;
}

.event-dot {
  transform-box: fill-box;
  transform-origin: center;
  transition:
    transform 620ms cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 180ms ease,
    fill 180ms ease;
}

.map-base {
  pointer-events: none;
}

.map-base.is-faint {
  opacity: 0.28;
}

.map-camera {
  opacity: 1;
  transform-box: view-box;
  transform-origin: 0 0;
  will-change: transform;
  transition:
    opacity 980ms ease,
    transform 1750ms cubic-bezier(0.16, 0.82, 0.22, 1);
}

.map-camera.is-flying {
  opacity: 0.58;
  transform: translate(46px, -34px) scale(0.68);
}

.map-camera.is-settled {
  opacity: 1;
  transform: translate(0, 0) scale(1);
}

.map-camera.is-manual {
  transition: none;
}

.map-ward,
.map-road {
  vector-effect: non-scaling-stroke;
}

.map-poi {
  opacity: 0.42;
}

.map-event-point {
  transform-box: fill-box;
  transform-origin: center;
  transition:
    transform 780ms cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 180ms ease,
    fill 180ms ease;
  stroke: var(--page);
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
}

.map-event-point.has-article,
.month-sample-dot.has-article,
.road-dot.has-article,
.event-dot.has-article {
  cursor: pointer;
}

.month-sample-dot {
  opacity: 0.78;
  transform-box: fill-box;
  transform-origin: center;
  transition:
    transform 940ms cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 520ms ease 620ms;
}

.year-layer {
  opacity: 0;
  transform-box: fill-box;
  transform-origin: bottom center;
  animation: layer-rise 520ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.year-layer.is-muted,
.year-key.is-muted {
  opacity: 0.14 !important;
}

.year-layer.is-focused,
.year-key.is-focused {
  opacity: 1 !important;
}

.year-key {
  cursor: pointer;
  transition: opacity 160ms ease;
}

.month-total-line,
.month-total-dot {
  opacity: 0;
  animation: month-total-in 560ms ease forwards;
}

.road-dot {
  transform-box: fill-box;
  transform-origin: center;
  transition:
    transform 430ms cubic-bezier(0.22, 0.76, 0.24, 1),
    opacity 120ms ease,
    fill 120ms ease;
  stroke: var(--page);
  stroke-width: 0.38;
}

.road-dot.is-muted {
  opacity: 0.12;
}

.road-legend-item {
  cursor: pointer;
}

.road-legend-item .axis-label {
  transition: opacity 160ms ease;
}

.road-legend-item:hover .axis-label,
.road-legend-item:focus .axis-label {
  fill: var(--ink);
}

@keyframes layer-rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes month-total-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.chart-title {
  fill: var(--ink);
  font-family: "Raleway", ui-sans-serif, system-ui, sans-serif;
  font-weight: 760;
}

.bar-label,
.cell-label,
.line-label,
.cluster-label {
  fill: var(--subtle);
  font-family: "Nunito", ui-sans-serif, system-ui, sans-serif;
  font-weight: 700;
}

.cluster-label {
  fill: var(--muted);
}

.chart-tooltip {
  position: fixed;
  z-index: 80;
  max-width: 280px;
  display: grid;
  gap: 5px;
  padding: 12px 14px;
  border-radius: 16px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 18px 46px var(--shadow-strong);
  pointer-events: none;
}

.chart-tooltip.has-action {
  pointer-events: auto;
}

.chart-tooltip strong,
.chart-tooltip span {
  display: block;
}

.chart-tooltip strong {
  font-size: 0.92rem;
  line-height: 1.25;
}

.chart-tooltip span {
  color: var(--subtle);
  font-size: 0.82rem;
}

.chart-tooltip .tooltip-action {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  width: max-content;
  max-width: 100%;
  margin-top: 3px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
}

.chart-tooltip .tooltip-action span {
  display: inline;
  color: inherit;
}

.chart-tooltip .tooltip-action:hover {
  text-decoration: underline;
}

.chart-tooltip .tooltip-action:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

[hidden].chart-tooltip {
  display: none;
}

.source-note {
  margin: 0;
  color: var(--faded);
  font-size: 0.94rem;
}

.method-note {
  max-width: 860px;
}

.method-note h2 {
  font-size: 2rem;
}

.method-note p {
  margin: 16px 0 0;
  color: var(--subtle);
  font-size: 1.06rem;
}

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

  .step {
    transition: none;
  }

  .year-layer {
    opacity: 1;
    animation: none;
  }

  .month-sample-dot {
    transition: none;
  }

  .event-dot,
  .map-event-point,
  .map-camera,
  .road-dot {
    transition: none;
  }

  .month-total-line,
  .month-total-dot {
    opacity: 1;
    animation: none;
  }
}

@media (max-width: 1080px) {
  h1 {
    font-size: 3.8rem;
  }

  .intro-grid {
    grid-template-columns: 1fr;
  }

  .story-shell {
    grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
    gap: 36px;
  }
}

@media (max-width: 840px) {
  .page {
    padding-top: 28px;
  }

  .topbar {
    padding-inline: var(--gutter-content);
    margin-bottom: 54px;
  }

  .brand span {
    display: none;
  }

  .hero,
  .intro-grid,
  .method-note,
  .story-shell {
    padding-inline: var(--gutter-content);
  }

  h1 {
    font-size: 3rem;
  }

  .story-shell {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    padding-block-end: 12vh;
  }

  .visual {
    order: 1;
    position: sticky;
    top: 0;
    z-index: 4;
    width: 100%;
    min-width: 0;
    overflow: hidden;
    min-height: auto;
    grid-template-rows: auto auto;
    gap: 12px;
    padding: 16px 0 18px;
    background: var(--page);
  }

  .visual.has-tools {
    grid-template-rows: auto auto auto;
  }

  .steps {
    order: 2;
  }

  .source-note {
    font-size: 0.78rem;
    line-height: 1.32;
  }

  .visual-tools {
    width: 100%;
    max-width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }

  .visual-tools::-webkit-scrollbar {
    display: none;
  }

  .tool-chip {
    flex: 0 0 auto;
    min-height: 34px;
    white-space: nowrap;
  }

  .chart,
  .chart-canvas {
    width: 780px;
    min-width: 780px;
    height: 380px;
  }

  .step {
    min-height: 76vh;
    padding: 58px 0 72px;
  }
}

@media (max-width: 520px) {
  .page {
    width: min(100%, calc(100% - (var(--gutter-page) * 2)));
  }

  .top-actions {
    gap: 10px;
  }

  .icon-button {
    width: 44px;
    height: 44px;
  }

  h1 {
    font-size: 2.45rem;
  }

  .lede {
    font-size: 1rem;
  }

  .stat-panel {
    min-height: 136px;
    padding: 24px 26px;
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .stat-panel strong {
    font-size: 1.72rem;
  }

  .step h2 {
    font-size: 1.72rem;
  }

  .chart,
  .chart-canvas {
    width: 860px;
    min-width: 860px;
    height: 360px;
  }
}

.chart.fit-chart,
.chart-canvas.fit-chart {
  width: 100%;
  min-width: 0;
}