:root {
  --bg: #f3f4f6;
  --surface: #ffffff;
  --border: #cbd5e1;
  --border-strong: #94a3b8;
  --ink: #1f2937;
  --muted: #4b5563;
  --headline: #c3423f;
  --core: #1d6fa5;
  --positive: #cf4d45;
  --negative: #2f6aa0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1.5rem 1rem 3rem;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

header.hero,
main {
  max-width: 980px;
  margin: 0 auto;
}

.hero {
  margin-bottom: 1.75rem;
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.25;
  font-family: Arial, Helvetica, sans-serif;
}

h1 {
  margin-top: 0.35rem;
  font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
}

h3 {
  font-size: 1.05rem;
}

.deck {
  max-width: 70ch;
  margin: 0.75rem 0 0;
  font-size: 1rem;
  color: var(--muted);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 0.75rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.copy-block {
  max-width: 74ch;
  margin-bottom: 1.75rem;
}

.copy-block p {
  margin: 0.85rem 0;
}

.scrolly-section {
  margin: 1.5rem 0 2.25rem;
}

.scrolly-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 1rem;
  margin-top: 0.9rem;
}

.steps {
  display: grid;
  gap: 0.75rem;
}

.step {
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.step p {
  margin: 0.4rem 0 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.step.is-active {
  border-color: var(--border-strong);
  background: #f8fafc;
}

.sticky-panel {
  position: sticky;
  top: 0.75rem;
  align-self: start;
}

.viz-section {
  margin: 2rem 0;
}

.section-head {
  margin-bottom: 0.65rem;
}

.section-head p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.section-head.split {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 0.8rem;
}

.card {
  padding: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
}

.step-card {
  min-height: 220px;
}

.focus-target {
  transition: border-color 160ms ease;
}

.focus-target.is-scrolly-focus {
  border-color: var(--border-strong);
}

.chart {
  position: relative;
  width: 100%;
  min-height: 360px;
}

.tooltip {
  position: absolute;
  pointer-events: none;
  padding: 0.45rem 0.55rem;
  border: 1px solid #111827;
  border-radius: 4px;
  background: #111827;
  color: #ffffff;
  font-size: 0.82rem;
  line-height: 1.35;
  transform: translate(10px, -14px);
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.55rem;
  margin-top: 0.6rem;
}

.stat-chip {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #f8fafc;
}

.stat-chip .label {
  display: block;
  font-size: 0.74rem;
  color: var(--muted);
}

.stat-chip strong {
  font-size: 1rem;
}

.controls {
  display: inline-flex;
  gap: 0.45rem;
}

.toggle {
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

.toggle.is-active {
  background: #e5e7eb;
}

#category-title {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.claim-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.claim-card {
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
}

.claim-card p {
  margin: 0.35rem 0;
  color: var(--muted);
}

.claim-card strong {
  display: inline-block;
  font-size: 0.95rem;
  color: var(--ink);
}

.axis path,
.axis line {
  stroke: #94a3b8;
}

.grid line {
  stroke: rgba(148, 163, 184, 0.35);
}

.grid path {
  display: none;
}

.legend {
  font-size: 0.86rem;
  fill: #334155;
}

.reference-note,
.footnote {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.citations ul {
  margin: 0.7rem 0 0;
  padding-left: 1.1rem;
}

.citations li {
  margin: 0.5rem 0;
}

a {
  color: #1d4ed8;
}

@media (max-width: 900px) {
  .scrolly-grid {
    grid-template-columns: 1fr;
  }

  .sticky-panel {
    position: static;
  }
}

@media (max-width: 700px) {
  body {
    padding: 1.1rem 0.75rem 2.5rem;
  }

  .chart {
    min-height: 320px;
  }

  .claim-row {
    grid-template-columns: 1fr;
  }
}