:root {
  /* Warm "paper" palette — editorial, not SaaS */
  --paper: #f6f3ec;
  --paper-tint: #efeae0;
  --surface: #fffdf9;
  --ink: #1c1a17;
  --ink-soft: #4a463f;
  --ink-faint: #847d72;
  --rule: #ddd6c9;
  --rule-strong: #c7bfae;
  --accent: #9a3412;          /* burnt sienna */
  --accent-soft: #b45309;
  --accent-wash: #f3e3d6;

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;

  --maxw: 1180px;
  --measure: 660px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16140f;
    --paper-tint: #1d1a14;
    --surface: #1f1c16;
    --ink: #ece7dc;
    --ink-soft: #c3bcae;
    --ink-faint: #8d8576;
    --rule: #36322a;
    --rule-strong: #4a4438;
    --accent: #e0794b;
    --accent-soft: #e8975f;
    --accent-wash: #2a2018;
  }
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 2rem;
}

a { color: var(--accent); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.5rem;
}

/* ── Masthead ── */
.masthead {
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  padding: 4.5rem 0 3rem;
}

.masthead-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  margin: 0;
  font-optical-sizing: auto;
}

.masthead-subtitle {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  font-size: clamp(1.25rem, 3vw, 1.9rem);
  line-height: 1.2;
  color: var(--ink-soft);
  margin: 0.65rem 0 0;
  max-width: 22ch;
}

.standfirst {
  font-size: 1.18rem;
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: var(--measure);
  margin: 2rem 0 0;
}

.byline {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 1.75rem 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
}

.byline-tag {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--accent);
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  padding: 0.2rem 0.5rem;
}
.byline-tag:hover { background: var(--accent-wash); }

/* ── Sticky section nav ── */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.topnav .container {
  display: flex;
  gap: 2rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.topnav a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 2px;
}
.topnav a:hover { color: var(--accent); }
.topnav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width 0.2s;
}
.topnav a:hover::after { width: 100%; }

/* ── Sections ── */
.section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--rule);
}
.section--tint { background: var(--paper-tint); }

.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 1.5rem;
  align-items: baseline;
  margin-bottom: 3rem;
  max-width: var(--maxw);
}

.section-num {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  padding-top: 0.5rem;
}

.section-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  letter-spacing: -0.015em;
  line-height: 1.05;
  margin: 0;
}

.section-dek {
  grid-column: 2;
  margin: 0.25rem 0 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: var(--measure);
}

/* ── Figures ── */
.fig {
  margin: 0 0 4.5rem;
}
.fig:last-child { margin-bottom: 0; }

.fig-cap {
  border-top: 2px solid var(--ink);
  padding-top: 1rem;
  margin-bottom: 1.75rem;
  max-width: var(--measure);
}

.fig-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.fig-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0.4rem 0 0.6rem;
}

.fig-desc {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.6;
}

.fig-controls {
  margin-top: 1.1rem;
}

.fig-controls label {
  font-size: 0.85rem;
  color: var(--ink-faint);
  font-family: var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.fig-plot {
  position: relative;
  width: 100%;
  min-height: 340px;
  max-height: 520px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 1.25rem;
}

.fig-plot--scroll {
  max-height: none;
  min-height: auto;
  overflow-x: auto;
}

.fig-plot--traj {
  height: 460px;
  max-height: none;
}

/* Trajectory custom legend (lives outside the canvas) */
.traj-legend {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem 1.5rem;
}
.traj-legend li {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  font-size: 0.9rem;
  line-height: 1.35;
}
.traj-sw {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  border-radius: 2px;
  transform: translateY(1px);
}
.traj-name { color: var(--ink); }
.traj-proj {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  white-space: nowrap;
}

select {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  padding: 0.4rem 0.7rem;
  margin-left: 0.5rem;
}

/* ── Explorer ── */
.explorer-controls {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}

.explorer-controls input,
.explorer-controls select {
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  font-size: 0.95rem;
  font-family: var(--sans);
  background: var(--surface);
  color: var(--ink);
  margin: 0;
}
.explorer-controls input:focus,
.explorer-controls select:focus {
  outline: none;
  border-color: var(--accent);
}

.explorer-controls input[type="search"] {
  flex: 1;
  min-width: 240px;
}

.explorer-table-wrap {
  overflow-x: auto;
  border-top: 2px solid var(--ink);
}

.explorer-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.explorer-table th,
.explorer-table td {
  padding: 0.8rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

.explorer-table th {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: transparent;
  position: sticky;
  top: 0;
}

.explorer-table tbody tr {
  cursor: pointer;
  transition: background 0.12s;
}
.explorer-table tbody tr:hover { background: var(--accent-wash); }
.explorer-table tbody tr td:first-child {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1rem;
}

.rank-label { font-size: 0.75rem; color: var(--ink-faint); text-transform: none; letter-spacing: 0; }
.rank-badge { font-size: 0.78rem; color: var(--ink-faint); margin-left: 0.25rem; }

.disc-badge {
  display: inline-block;
  padding: 0.18rem 0.55rem;
  border-radius: 20px;
  font-size: 0.74rem;
  font-weight: 600;
  white-space: nowrap;
}

/* ── Journal detail modal ── */
.journal-detail {
  position: fixed;
  inset: 0;
  background: rgba(20,18,14,0.55);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}
.journal-detail[hidden] { display: none; }

.journal-detail-inner {
  background: var(--surface);
  border-radius: 4px;
  padding: 2.5rem;
  max-width: 1000px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  border: 1px solid var(--rule-strong);
}

.journal-detail-inner h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.6rem;
  margin: 0 0 0.3rem;
}

.close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: transparent;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
}
.close-btn:hover { background: var(--accent-wash); }

.detail-meta {
  color: var(--ink-faint);
  margin-bottom: 2rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
}

.detail-charts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1.5rem;
}

.detail-chart-card {
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 1.25rem;
  background: var(--paper);
}
.detail-chart-card h5 {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ── Prose / methods ── */
.prose {
  max-width: var(--measure);
  margin-bottom: 3rem;
}
.prose p { font-size: 1.08rem; line-height: 1.7; color: var(--ink-soft); }
.prose-lead {
  font-family: var(--serif);
  font-size: 1.3rem !important;
  line-height: 1.4 !important;
  color: var(--ink) !important;
  margin: 0 0 0.5rem;
}
.prose details { margin-top: 1.25rem; border-top: 1px solid var(--rule); padding-top: 1rem; }
.prose summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}
.prose details p { font-size: 1rem; margin-top: 1rem; }

.glossary-details {
  border-top: 2px solid var(--ink);
}

.glossary-head {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.5rem;
  margin: 0;
  padding: 1rem 0;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.glossary-head::-webkit-details-marker { display: none; }
.glossary-head::after {
  content: "+";
  font-family: var(--mono);
  font-weight: 400;
  font-size: 1.4rem;
  color: var(--accent);
  line-height: 1;
}
.glossary-details[open] > .glossary-head::after { content: "–"; }
.glossary-head:hover { color: var(--accent); }
.glossary-details > #metric-glossary { padding-bottom: 1.5rem; }

.glossary-note {
  max-width: var(--measure);
  color: var(--ink-soft);
  font-size: 1rem;
  margin: 0 0 2rem;
}

.metric-group { margin-bottom: 2rem; }
.metric-group:last-child { margin-bottom: 0; }

.metric-group-head {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

.metric-list { margin: 0; }

.metric-row {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) 2fr;
  gap: 0.4rem 2rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
}
.metric-row:last-child { border-bottom: none; }

.metric-row dt {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink);
  line-height: 1.3;
}

.metric-row dd {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-soft);
}

.metric-src {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.01em;
  color: var(--ink-faint);
}
.metric-src em { font-family: var(--serif); font-style: italic; }

@media (max-width: 640px) {
  .metric-row { grid-template-columns: 1fr; gap: 0.3rem; }
}

/* ── Cite ── */
.paper-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.85rem;
  text-decoration: none;
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 0.85rem 1.4rem;
  background: var(--surface);
  transition: background 0.15s, color 0.15s;
}
.paper-link:hover { background: var(--ink); }
.paper-link:hover .paper-link-label,
.paper-link:hover .paper-link-id { color: var(--paper); }
.paper-link-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.paper-link-id {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink);
}

.citation {
  margin: 2.5rem 0 0;
  padding: 1.5rem 0 0 1.5rem;
  border-left: 2px solid var(--accent);
  max-width: var(--measure);
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--ink-soft);
}
.citation em { font-style: italic; }

/* ── Footer ── */
.site-footer {
  padding: 2.5rem 0;
  background: var(--paper);
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

/* ── Responsive ── */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .container { padding: 0 1.25rem; }
  .masthead { padding: 3rem 0 2rem; }
  .section { padding: 3.5rem 0; }
  .section-head { grid-template-columns: 1fr; gap: 0.5rem; }
  .section-num { padding-top: 0; }
  .section-dek { grid-column: 1; }
  .topnav .container { gap: 1.25rem; overflow-x: auto; }
  .detail-charts { grid-template-columns: 1fr; }
  .journal-detail-inner { padding: 1.5rem; }
  .fig-plot { padding: 0.85rem; }
  .fig-plot--traj { height: 380px; }
  .traj-legend { grid-template-columns: 1fr; gap: 0.45rem; }
  .traj-proj { margin-left: 0.5rem; }
}