:root {
  color-scheme: light;
  --bg-main: #FAFAFA;
  --bg-card: #FFFFFF;
  --bg-header: #FFFFFF;
  --bg-accent: rgba(37, 99, 235, 0.05);
  --bg-muted: #F1F5F9;
  --border-color: #E2E8F0;
  --border-accent: rgba(37, 99, 235, 0.2);
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --brand-accent: #2563EB;
  --pill-bg: #E2E8F0;
  --code-bg: #F8FAFC;
  --fill: #0F172A;
  --fill-accent: #2563EB;
  --font-heading: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-body: Georgia, Cambria, "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg-main: #0B1220;
  --bg-card: #111827;
  --bg-header: #0F172A;
  --bg-accent: rgba(37, 99, 235, 0.12);
  --bg-muted: #1E293B;
  --border-color: #334155;
  --border-accent: rgba(96, 165, 250, 0.35);
  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --brand-accent: #60A5FA;
  --pill-bg: #1E293B;
  --code-bg: #0F172A;
  --fill: #E2E8F0;
  --fill-accent: #60A5FA;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-padding-top: 5.25rem; }

#about,
#index,
.search-input,
.filter-pills,
.paper-card { scroll-margin-top: 5.25rem; }

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.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;
}

.site-header {
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-header);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 2;
}

.nav-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--font-heading);
}

.brand-logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  white-space: nowrap;
}

.brand-logo span {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.9rem;
  margin-left: 0.5rem;
}

.nav-links {
  font-size: 0.875rem;
  display: flex;
  gap: 1.15rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a { color: var(--text-secondary); }

.theme-toggle {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  cursor: pointer;
}

.theme-toggle:hover { background: var(--bg-muted); }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 1.5rem 0;
}

.hero {
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2.5rem;
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--brand-accent);
  margin-bottom: 0.75rem;
}

.kicker a { color: inherit; }

.hero-title,
.article-title {
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--text-primary);
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.lede {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 780px;
}

.lede strong,
.editorial-box strong { color: var(--text-primary); }

.editorial-box {
  background: var(--bg-accent);
  border: 1px solid var(--border-accent);
  border-radius: 6px;
  padding: 0.9rem 1.15rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 1.5rem;
}

.editorial-box summary {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
}

.editorial-box summary::-webkit-details-marker { display: none; }

.editorial-box summary::before {
  content: "▸";
  display: inline-block;
  width: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.editorial-box[open] summary::before { content: "▾"; }

.editorial-box p { margin-top: 0.75rem; }

.controls-section {
  margin-bottom: 2.5rem;
  font-family: var(--font-heading);
}

.search-input {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
  font-family: var(--font-heading);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-card);
  color: var(--text-primary);
  margin-bottom: 1rem;
  outline: none;
}

.search-input:focus { border-color: var(--brand-accent); }

.filter-pills { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.pill {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  background: var(--pill-bg);
  color: var(--text-secondary);
  cursor: pointer;
  border: none;
}

.pill.active,
.pill:hover {
  background: var(--text-primary);
  color: var(--bg-main);
}

.research-grid { display: flex; flex-direction: column; gap: 2.5rem; }

.paper-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.75rem;
}

.paper-card:hover { border-color: #94A3B8; }

@media (min-width: 850px) {
  .paper-card { grid-template-columns: 2.2fr 1fr; }
}

.paper-main { display: flex; flex-direction: column; gap: 0.75rem; }

.paper-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.2rem 0.5rem;
  background: var(--bg-muted);
  color: var(--text-muted);
  border-radius: 4px;
  width: fit-content;
}

.paper-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

.paper-title a { color: inherit; }
.paper-title a:hover { color: var(--brand-accent); }

.paper-abstract {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.paper-margin {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-family: var(--font-heading);
}

@media (min-width: 850px) {
  .paper-margin {
    border-top: none;
    border-left: 1px solid var(--border-color);
    padding-top: 0;
    padding-left: 1.25rem;
  }
}

.meta-item strong {
  color: var(--text-primary);
  display: block;
  font-weight: 600;
}

.citation-box {
  margin-top: auto;
  padding-top: 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.btn-cite {
  font-family: var(--font-mono);
  font-size: 0.725rem;
  background: transparent;
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-secondary);
}

.btn-cite:hover { background: var(--bg-muted); }

.copy-fallback {
  width: 100%;
  margin-top: 0.15rem;
  padding: 0.55rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--text-secondary);
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  resize: vertical;
}

.bibtex-details {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.bibtex-details summary {
  cursor: pointer;
  width: fit-content;
  list-style: none;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.3rem 0.6rem;
}

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

.bibtex-details summary:hover { background: var(--bg-muted); }

.bibtex {
  margin-top: 0.6rem;
  padding: 0.75rem;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow-x: auto;
  white-space: pre;
  line-height: 1.45;
  color: var(--text-secondary);
}

.empty-state {
  font-family: var(--font-heading);
  color: var(--text-muted);
  padding: 2rem 0 1rem;
}

.directory {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.directory h2,
.section-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.directory-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.directory-list li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding-left: 0.9rem;
  border-left: 2px solid var(--border-color);
}

.directory-list a { font-family: var(--font-heading); font-weight: 600; }

.article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 850px) {
  .article-grid {
    grid-template-columns: minmax(0, 65fr) minmax(220px, 35fr);
    gap: 2.75rem;
  }
}

.article-title {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.lede + .article-grid,
.lede + .authority-list { margin-top: 2.25rem; }

.article-body p,
.article-body li {
  color: var(--text-secondary);
  font-size: 1.02rem;
}

.article-body strong { color: var(--text-primary); }

.article-body p + p,
.article-body ul,
.article-body ol,
.article-body h2,
.article-body figure,
.article-body .callout {
  margin-top: 1.1rem;
}

.article-body h2 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-top: 2rem;
}

.article-body ul,
.article-body ol {
  padding-left: 1.2rem;
}

.article-body li + li { margin-top: 0.4rem; }

.callout {
  background: var(--bg-accent);
  border: 1px solid var(--border-accent);
  border-radius: 6px;
  padding: 1rem 1.15rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.article-margin {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

@media (min-width: 850px) {
  .article-margin {
    position: sticky;
    top: 5.5rem;
    border-left: 1px solid var(--border-color);
    padding-left: 1.25rem;
  }
}

.recall-chart {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.9rem 1rem 1rem;
}

.recall-chart figcaption {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
  line-height: 1.4;
}

.recall-chart figcaption span {
  display: block;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.recall-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.2rem 0.6rem;
  margin-top: 0.7rem;
}

.recall-label,
.recall-value {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.recall-value { font-variant-numeric: tabular-nums; }

.recall-track {
  grid-column: 1 / -1;
  height: 8px;
  background: var(--bg-muted);
  border-radius: 99px;
  overflow: hidden;
}

.recall-fill {
  display: block;
  height: 100%;
  background: var(--fill);
  border-radius: 99px;
}

.recall-fill-accent { background: var(--fill-accent); }

.chart-source {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.45;
  color: var(--text-muted);
}

.article-body { min-width: 0; }
.article-body code { overflow-wrap: anywhere; }

.story-chart {
  --chart-blue: #1F5FBF;
  --chart-blue-soft: #7FA6DE;
  --chart-blue-pale: #C8D8F0;
  --chart-red: #B33A2E;
  --chart-ink: #1E293B;
  --chart-gray: #9AA6B6;
  --chart-gray-light: #D5DBE3;
  --chart-grid: #E5E9EF;
  --chart-axis: #475569;
  --chart-band: rgba(15, 23, 42, 0.045);
  --chart-dot: rgba(71, 85, 105, 0.32);
  margin: 2rem 0 2.25rem;
  padding-top: 0.85rem;
  border-top: 2px solid var(--text-primary);
}

[data-theme="dark"] .story-chart {
  --chart-blue: #6EA8FE;
  --chart-blue-soft: #3F6DB3;
  --chart-blue-pale: #24406A;
  --chart-red: #F08A7E;
  --chart-ink: #E2E8F0;
  --chart-gray: #64748B;
  --chart-gray-light: #334155;
  --chart-grid: #263244;
  --chart-axis: #94A3B8;
  --chart-band: rgba(248, 250, 252, 0.05);
  --chart-dot: rgba(203, 213, 225, 0.3);
}

.article-body .story-chart .sc-title {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.3;
  color: var(--text-primary);
}

.article-body .story-chart .sc-dek {
  margin-top: 0.3rem;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text-muted);
}

.story-chart .sc-body {
  margin-top: 1rem;
  overflow-x: auto;
}

.story-chart .sc-svg {
  display: block;
  width: 100%;
  min-width: 500px;
  height: auto;
  overflow: visible;
}

.article-body .story-chart .sc-note,
.article-body .story-chart .sc-source {
  margin-top: 0.7rem;
  font-family: var(--font-heading);
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.article-body .story-chart .sc-source { margin-top: 0.3rem; }

.sc-svg text {
  font-family: var(--font-heading);
  font-variant-numeric: tabular-nums;
}

.sc-svg .sc-t { fill: var(--text-secondary); font-size: 12px; }
.sc-svg .sc-tm { fill: var(--text-muted); font-size: 11px; }
.sc-svg .sc-th { fill: var(--text-primary); font-size: 12px; font-weight: 600; }
.sc-svg .sc-tv { fill: var(--text-primary); font-size: 12.5px; font-weight: 700; }
.sc-svg .sc-ta { fill: var(--text-primary); font-size: 12px; }
.sc-svg .sc-blue { fill: var(--chart-blue); }
.sc-svg .sc-red { fill: var(--chart-red); }
.sc-svg .sc-on-dark { fill: #FFFFFF; }
.sc-svg .sc-halo {
  paint-order: stroke;
  stroke: var(--bg-main);
  stroke-width: 4px;
  stroke-linejoin: round;
}

.sc-svg .sc-grid { stroke: var(--chart-grid); stroke-width: 1; }
.sc-svg .sc-axis { stroke: var(--chart-axis); stroke-width: 1; }
.sc-svg .sc-bracket { fill: none; stroke: var(--text-muted); stroke-width: 1; }
.sc-svg .sc-noFill { fill: none; }
.sc-svg .sc-ring { stroke: var(--bg-main); stroke-width: 1.5; }
.sc-svg .sc-seg { stroke: var(--bg-main); stroke-width: 1.5; }
.sc-svg .sc-flow { opacity: 0.35; }

.sc-svg .f-blue { fill: var(--chart-blue); }
.sc-svg .f-blue-soft { fill: var(--chart-blue-soft); }
.sc-svg .f-blue-pale { fill: var(--chart-blue-pale); }
.sc-svg .f-red { fill: var(--chart-red); }
.sc-svg .f-ink { fill: var(--chart-ink); }
.sc-svg .f-gray { fill: var(--chart-gray); }
.sc-svg .f-gray-light { fill: var(--chart-gray-light); }
.sc-svg .f-band { fill: var(--chart-band); }
.sc-svg .f-dot { fill: var(--chart-dot); }
.sc-svg .f-ring-open { fill: var(--bg-main); stroke: var(--chart-red); stroke-width: 2; }
.sc-svg .f-ring-open.sc-ring-blue { stroke: var(--chart-blue); }

.sc-svg .s-blue { stroke: var(--chart-blue); stroke-width: 2; }
.sc-svg .s-blue-soft { stroke: var(--chart-blue-soft); stroke-width: 2; }
.sc-svg .s-red { stroke: var(--chart-red); stroke-width: 2; }
.sc-svg .s-ink { stroke: var(--chart-ink); stroke-width: 1.25; }
.sc-svg .s-gray { stroke: var(--chart-gray); stroke-width: 1.6; }
.sc-svg .s-light { stroke: var(--chart-grid); stroke-width: 1.5; }

.record-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  margin-top: 1rem;
}

.record-table th,
.record-table td {
  text-align: left;
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: top;
}

.record-table th {
  color: var(--text-muted);
  font-weight: 600;
  width: 34%;
}

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

.authority-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.authority {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem 1.35rem;
}

.authority h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.authority p { color: var(--text-secondary); font-size: 0.95rem; }

.status-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
}

.site-footer {
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0 3rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-footer strong { color: var(--text-secondary); font-weight: 600; }

@media (max-width: 720px) {
  .hero-title { font-size: 2rem; }
  .article-title { font-size: 1.65rem; }
  .nav-container {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.65rem;
  }
  .nav-links { justify-content: flex-start; }
}