:root {
  --paper: #f6f4ef;
  --paper-deep: #ece7dc;
  --ink: #16202a;
  --muted: #4a5968;
  --line: #c9c2b3;
  --brand: #1d4f63;
  --brand-soft: #d9e7ec;
  --signal-verified: #1d5e36;
  --signal-assumption: #785307;
  --signal-projection: #5d1e46;
  --card: #fbfaf6;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Public Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 6%, rgba(29, 79, 99, 0.1), transparent 28%),
    radial-gradient(circle at 88% 14%, rgba(120, 83, 7, 0.07), transparent 24%),
    linear-gradient(180deg, var(--paper), var(--paper-deep));
  line-height: 1.6;
}

.skip-link {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.6rem 0.8rem;
  background: #ffffff;
  border: 2px solid var(--brand);
  z-index: 999;
}

.site-header,
main {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  padding: 1.4rem 0 1rem;
  border-bottom: 1px solid var(--line);
}

.publication-tag {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--muted);
}

.site-header h1 {
  margin: 0.15rem 0 0;
  font-family: "Literata", Georgia, serif;
  font-size: clamp(1.7rem, 5vw, 2.6rem);
  line-height: 1.1;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1rem;
  margin-top: 1rem;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  border-bottom-color: var(--brand);
  outline: none;
}

main {
  padding: 1.4rem 0 2.5rem;
  display: grid;
  gap: 1.2rem;
}

.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: clamp(1rem, 2.2vw, 1.8rem);
}

.kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.74rem;
  color: var(--muted);
  font-weight: 700;
}

.feature-header h2 {
  margin: 0.45rem 0 0.8rem;
  font-family: "Literata", Georgia, serif;
  font-size: clamp(1.8rem, 4.4vw, 3.1rem);
  line-height: 1.08;
  max-width: 19ch;
}

.standfirst {
  margin: 0;
  font-size: 1.05rem;
  color: #2a3744;
  max-width: 64ch;
}

.feature h3,
.feature h4,
.references h2 {
  font-family: "Literata", Georgia, serif;
  line-height: 1.2;
}

.feature h3 {
  margin-bottom: 0.5rem;
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
}

.feature section {
  margin-top: 1.6rem;
}

.domain-grid {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.55rem;
}

.domain-grid li {
  border: 1px solid var(--line);
  background: #ffffff;
  padding: 0.55rem 0.65rem;
  font-weight: 600;
  font-size: 0.92rem;
}

.evidence-panel {
  margin-top: 1.2rem;
  padding: 0.9rem;
  background: #f3f7f8;
  border-left: 4px solid var(--brand);
}

.evidence-panel h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.evidence-panel p {
  margin: 0.38rem 0;
}

blockquote {
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--brand);
  background: var(--brand-soft);
  font-family: "Literata", Georgia, serif;
  font-size: 1.1rem;
}

.fact-label,
.assumption-label,
.projection-label {
  margin: 0.9rem 0 0.2rem;
  font-size: 0.92rem;
}

.fact-label strong {
  color: var(--signal-verified);
}

.assumption-label strong {
  color: var(--signal-assumption);
}

.projection-label strong {
  color: var(--signal-projection);
}

.diagram {
  margin: 0.8rem 0;
  border: 1px solid var(--line);
  background: #ffffff;
  padding: 0.7rem;
}

.diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

.diagram rect {
  fill: #f5f7f9;
  stroke: #405463;
  stroke-width: 1.4;
}

.diagram path {
  fill: none;
  stroke: #405463;
  stroke-width: 2;
  stroke-linecap: round;
}

.diagram text {
  fill: #1a2733;
  font-size: 18px;
  text-anchor: middle;
  font-family: "Public Sans", "Segoe UI", sans-serif;
}

.diagram figcaption {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.timeline {
  margin: 0.8rem 0;
  border: 1px solid var(--line);
  background: #ffffff;
  padding: 0.9rem;
}

.latest-grid {
  display: grid;
  gap: 0.8rem;
}

.latest-card {
  border: 1px solid var(--line);
  background: #ffffff;
  padding: 0.8rem;
}

.latest-card h3 {
  margin: 0.2rem 0 0.45rem;
  font-family: "Literata", Georgia, serif;
}

.latest-card h3 a {
  color: var(--ink);
  text-decoration: none;
}

.latest-card h3 a:hover,
.latest-card h3 a:focus-visible {
  text-decoration: underline;
}

.timeline figcaption {
  font-weight: 600;
  margin-bottom: 0.8rem;
}

.timeline ol {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.65rem;
}

.timeline li {
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed #d5d0c2;
}

.timeline li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.time {
  margin: 0;
  font-weight: 700;
  color: #27384a;
}

.timeline li p {
  margin: 0.25rem 0 0;
}

.split-grid {
  display: grid;
  gap: 0.9rem;
  margin-top: 1rem;
}

.split-grid section {
  margin: 0;
  border: 1px solid var(--line);
  background: #ffffff;
  padding: 0.8rem;
}

.split-grid h4 {
  margin: 0 0 0.45rem;
}

.references {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  padding: clamp(0.9rem, 2.1vw, 1.2rem);
}

.references h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.references ul {
  margin: 0;
  padding-left: 1.15rem;
}

.references li {
  margin: 0.4rem 0;
}

.references a {
  color: #183f53;
}

.references a:focus-visible,
.references a:hover {
  color: #0e2f3e;
}

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
}

@media (min-width: 800px) {
  .site-header {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 1rem;
  }

  .site-nav {
    margin-top: 0;
    justify-content: flex-end;
  }

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

  .diagram {
    padding: 1rem;
  }
}