/*
 * Regional clustering study.
 *
 * The map remains the dominant interactive object.  Text panels are dense
 * enough to explain the research question without leaving ornamental empty
 * columns, and every data-driven area reserves its final footprint while the
 * reproducible result is loading.
 */

:root {
  /* These categorical aliases reuse the site's chart palette.  Their order
     carries no rank: labels and type numbers always accompany colour. */
  --cluster-1: var(--series-spo);
  --cluster-2: var(--series-vpo);
  --cluster-3: var(--series-teal);
  --cluster-4: var(--series-amber);
  --cluster-5: var(--series-violet);
  --cluster-6: var(--series-neutral);
  --cluster-7: color-mix(in srgb, var(--series-amber) 58%, var(--series-violet));
}

.clusters-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(19rem, 0.75fr);
  gap: clamp(2rem, 6vw, 5.5rem);
  align-items: center;
  width: min(100% - (2 * var(--gutter)), var(--content));
  margin-inline: auto;
  padding-block: clamp(3.75rem, 7vw, 6.5rem);
}

.clusters-hero > * {
  min-width: 0;
}

.clusters-hero h1 {
  max-width: 13ch;
  margin: 0 0 1.4rem;
  font-family: var(--font-serif);
  font-size: clamp(3rem, 6.8vw, 6.4rem);
  font-weight: 650;
  letter-spacing: -0.055em;
  line-height: 0.94;
  text-wrap: balance;
}

.clusters-hero__thesis {
  max-width: 50rem;
  margin-bottom: 1rem;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  line-height: 1.48;
}

.clusters-hero__lead {
  max-width: 48rem;
  margin-bottom: 1.6rem;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  line-height: 1.7;
}

.clusters-hero__action {
  width: fit-content;
}

.cluster-hypothesis-card {
  padding: clamp(1.25rem, 3vw, 1.8rem);
  border: 1px solid var(--line);
  border-top: 0.3rem solid var(--series-spo);
  border-radius: var(--radius-large);
  background: var(--paper-raised);
  box-shadow: var(--shadow-card);
}

.cluster-hypothesis-card h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  line-height: 1.08;
}

.cluster-hypothesis-card ol {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding-left: 1.25rem;
  color: var(--ink-soft);
}

.cluster-hypothesis-card li::marker {
  color: var(--series-spo);
  font-weight: 850;
}

.cluster-hypothesis-card__rule {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.cluster-minute {
  display: grid;
  grid-template-columns: minmax(15rem, 0.68fr) minmax(0, 1.32fr);
  gap: clamp(1.5rem, 5vw, 4.5rem);
  align-items: start;
  padding-block: clamp(2.25rem, 5vw, 4.25rem);
}

.cluster-minute__heading h2 {
  max-width: 12ch;
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.6rem);
  letter-spacing: -0.035em;
  line-height: 1;
}

.cluster-minute__copy {
  padding-left: clamp(1.1rem, 3vw, 2.25rem);
  border-left: 0.3rem solid var(--series-teal);
}

.cluster-minute__copy p {
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.45vw, 1.18rem);
  line-height: 1.72;
}

.cluster-minute__copy p + p {
  margin-top: 0.85rem;
}

.cluster-minute__copy strong {
  color: var(--ink);
}

/* Controls wrap by content rather than reserving rigid desktop columns.  A
   context selector can therefore appear without creating an empty gap. */
.cluster-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: end;
  margin-bottom: 0.75rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--paper-raised);
  box-shadow: var(--shadow-card);
}

.cluster-view-fieldset {
  min-width: min(100%, 31rem);
  flex: 2 1 31rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.cluster-view-fieldset legend {
  margin-bottom: 0.4rem;
  color: var(--ink-soft);
  font-size: 0.875rem;
  font-weight: 850;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.cluster-view-switch {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.35rem;
}

.cluster-view-switch button {
  min-width: 0;
  min-height: 3rem;
  padding: 0.62rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.7rem;
  background: var(--paper);
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 780;
  line-height: 1.25;
  cursor: pointer;
  transition:
    background-color 220ms ease,
    border-color 220ms ease,
    color 220ms ease,
    transform 220ms ease;
}

.cluster-view-switch button:hover {
  border-color: var(--ink-soft);
  color: var(--ink);
  transform: translateY(-1px);
}

.cluster-view-switch button[aria-pressed="true"] {
  border-color: var(--night);
  background: var(--night);
  color: var(--paper-raised);
}

.cluster-region-search,
.cluster-context-control {
  min-width: min(100%, 16rem);
  flex: 1 1 16rem;
}

.cluster-typology-control strong {
  display: flex;
  box-sizing: border-box;
  min-height: 3rem;
  align-items: center;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.7rem;
  background: #fffdf8;
  color: var(--ink);
  font: 650 0.95rem/1.2 var(--font-sans);
  letter-spacing: normal;
  text-transform: none;
}

.cluster-view-explanation {
  min-height: 3.5rem;
  margin: 0 0 1rem;
  padding: 0.7rem 0.9rem;
  border-left: 0.24rem solid var(--series-vpo);
  color: var(--ink-soft);
  line-height: 1.55;
}

.cluster-map-layout {
  align-items: stretch;
}

.cluster-map-card,
.cluster-region-rail {
  min-width: 0;
}

.cluster-map {
  width: 100%;
  aspect-ratio: 1000 / 570;
  min-height: 0;
  contain: layout paint;
}

.cluster-map-svg {
  display: block;
  width: 100%;
  height: 100%;
}

.cluster-map-svg text,
.cluster-map-label {
  fill: var(--ink);
  font-family: var(--font-sans);
  font-size: max(16px, var(--chart-svg-font-size));
  font-weight: 750;
  paint-order: stroke;
  stroke: var(--paper-raised);
  stroke-width: 3px;
  stroke-linejoin: round;
}

.cluster-map-region {
  cursor: pointer;
  stroke: color-mix(in srgb, var(--ink) 38%, transparent);
  stroke-width: 0.8;
  vector-effect: non-scaling-stroke;
  transition:
    fill 420ms cubic-bezier(0.2, 0.75, 0.25, 1),
    opacity 260ms ease,
    stroke 180ms ease,
    stroke-width 180ms ease;
}

.cluster-map-region:hover,
.cluster-map-region:focus-visible {
  stroke: var(--ink);
  stroke-width: 2.2;
}

.cluster-map-region.is-selected {
  stroke: var(--ink);
  stroke-width: 3.2;
}

.cluster-map-region.is-unavailable {
  fill: var(--map-missing);
}

.cluster-map-legend {
  display: flex;
  min-height: 4.5rem;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 1rem;
  padding: 0.85rem 1rem;
  color: var(--ink-soft);
  font-size: 1rem;
}

.cluster-legend-title {
  width: 100%;
  color: var(--ink);
  font-weight: 800;
}

.cluster-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
}

.cluster-legend-swatch {
  width: 0.78rem;
  height: 0.78rem;
  flex: 0 0 auto;
  border: 1px solid color-mix(in srgb, var(--ink) 30%, transparent);
  border-radius: 50%;
  background: var(--cluster-colour, var(--map-missing));
}

.cluster-region-rail {
  gap: 0;
}

.cluster-region-badge {
  width: fit-content;
  max-width: 100%;
  margin: 0 0 0.8rem;
  padding: 0.35rem 0.62rem;
  border-radius: 99rem;
  background: color-mix(in srgb, var(--series-vpo) 12%, var(--paper-raised));
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.cluster-region-metrics,
.cluster-moscow-diagnostics dl {
  display: grid;
  gap: 0;
  margin: 1rem 0;
}

.cluster-region-metrics div,
.cluster-moscow-diagnostics dl div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(5rem, auto);
  gap: 0.75rem;
  align-items: baseline;
  padding-block: 0.7rem;
  border-top: 1px solid var(--line);
}

.cluster-region-metrics dt,
.cluster-moscow-diagnostics dt {
  color: var(--ink-soft);
  font-size: 0.875rem;
}

.cluster-region-metrics dd,
.cluster-moscow-diagnostics dd {
  max-width: 14rem;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.18rem;
  font-weight: 650;
  text-align: right;
  overflow-wrap: anywhere;
}

.cluster-region-reading {
  margin-top: 0.35rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.cluster-region-reading h4 {
  margin: 0 0 0.4rem;
  font-size: 0.875rem;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.cluster-region-reading ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.cluster-region-caution {
  margin-top: auto;
  padding-top: 1rem;
  color: var(--ink-faint);
  font-size: 0.84rem;
  line-height: 1.5;
}

.cluster-results-section,
.cluster-methods-section {
  overflow: clip;
}

.cluster-confirmatory {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.cluster-results-intro {
  display: grid;
  grid-template-columns: minmax(15rem, 0.72fr) minmax(0, 1.28fr);
  gap: 0.35rem clamp(1.5rem, 4vw, 3.5rem);
  align-items: end;
  min-width: 0;
  padding: 1.2rem 1.25rem;
  border-top: 0.28rem solid var(--series-spo);
  background: var(--paper-raised);
}

.cluster-results-intro .figure-overline {
  grid-column: 1 / -1;
}

.cluster-results-intro h3,
.cluster-results-primer {
  margin-bottom: 0;
}

.cluster-results-intro h3,
.cluster-exploratory h3,
.cluster-moscow-reading h3,
.cluster-moscow-diagnostics h3,
.cluster-method-steps h3,
.cluster-decision-rules h3,
.cluster-model-selection h3,
.cluster-method-footer h3 {
  margin: 0 0 0.65rem;
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 2.5vw, 2.1rem);
  line-height: 1.12;
}

.cluster-results-primer,
.cluster-exploratory p,
.cluster-moscow-reading p,
.cluster-decision-rules p,
.cluster-method-footer p {
  color: var(--ink-soft);
}

.cluster-results-primer {
  display: grid;
  gap: 0.55rem;
}

.cluster-results-primer p {
  margin: 0;
  line-height: 1.58;
}

.cluster-result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.cluster-result-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: clamp(1.15rem, 2.5vw, 1.55rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--paper-raised);
  box-shadow: var(--shadow-card);
}

.cluster-result-number {
  margin-bottom: 0.45rem;
  color: var(--series-spo);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.cluster-result-card h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 2.3vw, 1.85rem);
  line-height: 1.15;
}

.cluster-result-method {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.cluster-result-values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7.8rem, 1fr));
  gap: 0.45rem;
  margin: 0.9rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.cluster-result-values div {
  min-width: 0;
}

.cluster-result-values dt {
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-weight: 750;
}

.cluster-result-values dd {
  margin: 0.2rem 0 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.14rem;
  font-weight: 650;
  overflow-wrap: anywhere;
}

.cluster-result-values dd[data-decision="supported"] {
  color: var(--series-teal);
}

.cluster-result-values dd[data-decision="not-supported"] {
  color: var(--series-spo);
}

.cluster-result-reading {
  margin-top: 0.9rem;
  padding: 0.85rem 0 0 1rem;
  border-top: 1px solid var(--line);
  border-left: 0.22rem solid var(--series-teal);
}

.cluster-result-reading strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--ink);
  font-size: 0.82rem;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.cluster-result-reading p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.58;
}

.cluster-exploratory {
  display: grid;
  grid-template-columns: minmax(16rem, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
  margin-top: 1.25rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-left: 0.35rem solid var(--series-violet);
  border-radius: var(--radius-large);
  background: var(--paper-muted);
}

.cluster-exploratory ul {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.cluster-exploratory li {
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.cluster-exploratory li:first-child {
  padding-top: 0;
  border-top: 0;
}

.cluster-exploratory strong {
  color: var(--ink);
}

.cluster-moscow-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(20rem, 0.82fr);
  gap: 1rem;
  align-items: stretch;
}

.cluster-moscow-reading,
.cluster-moscow-diagnostics {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--paper-raised);
}

.cluster-moscow-reading {
  border-top: 0.3rem solid var(--series-spo);
}

.cluster-moscow-findings {
  display: grid;
  gap: 0.55rem;
  margin: 0.95rem 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
}

.cluster-moscow-findings li::marker {
  color: var(--series-spo);
}

.cluster-moscow-caution {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-left: 0.22rem solid var(--series-amber);
  background: var(--paper-muted);
}

.cluster-moscow-diagnostics {
  border-top: 0.3rem solid var(--series-vpo);
}

.cluster-moscow-diagnostics dl {
  margin-bottom: 0;
}

.cluster-method-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.38fr) minmax(19rem, 0.62fr);
  gap: 1rem;
  align-items: start;
}

.cluster-method-steps,
.cluster-decision-rules {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--paper-raised);
}

.cluster-method-steps ol {
  display: grid;
  gap: 0;
  margin: 0;
  padding-left: 1.35rem;
}

.cluster-method-steps li {
  padding: 0.8rem 0 0.8rem 0.35rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.cluster-method-steps li:first-child {
  border-top: 0;
}

.cluster-method-steps li::marker {
  color: var(--series-spo);
  font-weight: 850;
}

.cluster-method-steps strong {
  display: block;
  margin-bottom: 0.22rem;
  color: var(--ink);
}

.cluster-method-citations {
  margin: 0.8rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.cluster-decision-rules {
  border-top: 0.3rem solid var(--series-teal);
}

.cluster-decision-rules ul {
  display: grid;
  gap: 0.65rem;
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: var(--ink-soft);
}

.cluster-glossary {
  display: grid;
  grid-template-columns: minmax(12rem, 0.55fr) minmax(0, 1.45fr);
  gap: 1rem clamp(1.5rem, 4vw, 3rem);
  align-items: start;
  margin-top: 1rem;
  padding: clamp(1.1rem, 2.7vw, 1.7rem);
  border-top: 0.28rem solid var(--series-vpo);
  background: var(--paper-raised);
}

.cluster-glossary h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 2.5vw, 2.1rem);
  line-height: 1.12;
}

.cluster-glossary dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1.5rem;
  margin: 0;
}

.cluster-glossary dl div {
  display: grid;
  gap: 0.15rem;
  min-width: 0;
}

.cluster-glossary dt {
  color: var(--ink);
  font-weight: 750;
}

.cluster-glossary dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.5;
}

.cluster-model-selection {
  margin-top: 1rem;
  padding: clamp(1.1rem, 2.7vw, 1.7rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--paper-raised);
  box-shadow: var(--shadow-card);
}

.cluster-model-selection__heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(18rem, 1.2fr);
  gap: 1rem 2rem;
  align-items: end;
  margin-bottom: 1rem;
}

.cluster-model-selection__heading p:last-child {
  margin: 0;
  color: var(--ink-soft);
}

.cluster-table-scroll {
  width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.cluster-model-table {
  width: 100%;
  min-width: 52rem;
  border-collapse: collapse;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.cluster-model-table caption {
  padding: 0 0 0.7rem;
  color: var(--ink-soft);
  font-size: 0.875rem;
  text-align: left;
}

.cluster-model-table th,
.cluster-model-table td {
  padding: 0.72rem 0.65rem;
  border-bottom: 1px solid var(--line);
  text-align: right;
  vertical-align: top;
}

.cluster-model-table th:first-child,
.cluster-model-table td:last-child {
  text-align: left;
}

.cluster-model-table thead th {
  color: var(--ink-soft);
  font-size: 0.78rem;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.cluster-model-table tbody tr.is-selected {
  background: color-mix(in srgb, var(--series-teal) 10%, var(--paper-raised));
}

.cluster-model-table tbody tr.is-rejected {
  color: var(--ink-faint);
}

.cluster-method-footer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.cluster-method-footer article {
  min-width: 0;
  padding: clamp(1.1rem, 2.5vw, 1.6rem);
  border-top: 0.25rem solid var(--series-neutral);
  background: var(--paper-raised);
}

.cluster-method-footer article:last-child {
  border-top-color: var(--series-violet);
}

.cluster-method-footer p {
  margin-bottom: 0.55rem;
}

.cluster-sources {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.cluster-source-hash,
.cluster-sources code {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.cluster-source-hash {
  margin-top: 0.65rem !important;
  font-size: 0.76rem !important;
}

@media (max-width: 68rem) {
  .cluster-sources {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

}

@media (max-width: 56rem) {
  .clusters-hero,
  .cluster-minute,
  .cluster-results-intro,
  .cluster-moscow-layout,
  .cluster-method-layout,
  .cluster-glossary,
  .cluster-model-selection__heading {
    grid-template-columns: 1fr;
  }

  .clusters-hero {
    align-items: start;
  }

  .cluster-minute__heading h2 {
    max-width: none;
  }

  .cluster-minute__copy {
    padding-top: 1rem;
    padding-left: 0;
    border-top: 0.3rem solid var(--series-teal);
    border-left: 0;
  }

  .clusters-hero h1 {
    max-width: 16ch;
  }

  .cluster-results-intro .figure-overline {
    grid-column: auto;
  }

  .cluster-region-caution {
    margin-top: 1rem;
  }

  .cluster-exploratory {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 44rem) {
  .cluster-result-grid,
  .cluster-glossary dl,
  .cluster-method-footer {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 38rem) {
  .clusters-hero h1 {
    max-width: 100%;
    font-size: clamp(2.25rem, 11.2vw, 3.25rem);
  }

  .clusters-hero__action {
    width: 100%;
  }

  .cluster-view-switch {
    grid-template-columns: 1fr;
  }

  .cluster-controls {
    padding: 0.8rem;
  }

  .cluster-region-search,
  .cluster-context-control {
    min-width: 100%;
  }

  .cluster-view-explanation {
    min-height: 13.8rem;
  }

  .cluster-map-legend {
    align-items: flex-start;
    padding-inline: 0.75rem;
  }

  .cluster-region-metrics div,
  .cluster-moscow-diagnostics dl div {
    grid-template-columns: 1fr;
    gap: 0.18rem;
  }

  .cluster-region-metrics dd,
  .cluster-moscow-diagnostics dd {
    max-width: none;
    text-align: left;
  }

  .cluster-sources {
    grid-template-columns: 1fr;
  }

}

@media (prefers-contrast: more) {
  .cluster-view-switch button,
  .cluster-result-card,
  .cluster-moscow-reading,
  .cluster-moscow-diagnostics,
  .cluster-method-steps,
  .cluster-decision-rules,
  .cluster-model-selection {
    border-color: var(--line-strong);
  }
}

@media (prefers-reduced-motion: reduce) {
  .cluster-view-switch button,
  .cluster-map-region {
    transition: none;
  }

  .cluster-view-switch button:hover {
    transform: none;
  }
}