:root {
  color-scheme: light;
  --surface-1: #fcfcfb;
  --page: #f9f9f7;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #898781;
  --gridline: #e1e0d9;
  --baseline: #c3c2b7;
  --accent: #2a78d6;
  --accent-2: #eb6834;
  --border: rgba(11, 11, 11, 0.1);
  --country-fill: #e1e0d9;
  --country-stroke: #fcfcfb;
  --selected-stroke: #eb6834;
  --ocean: #eef4f8;
  --graticule: #c7d6df;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --surface-1: #1a1a19;
    --page: #0d0d0d;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #898781;
    --gridline: #2c2c2a;
    --baseline: #383835;
    --accent: #3987e5;
    --accent-2: #d95926;
    --border: rgba(255, 255, 255, 0.1);
    --country-fill: #2c2c2a;
    --country-stroke: #1a1a19;
    --selected-stroke: #d95926;
    --ocean: #0f1b24;
    --graticule: #24333c;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-1: #1a1a19;
  --page: #0d0d0d;
  --text-primary: #ffffff;
  --text-secondary: #c3c2b7;
  --text-muted: #898781;
  --gridline: #2c2c2a;
  --baseline: #383835;
  --accent: #3987e5;
  --accent-2: #d95926;
  --border: rgba(255, 255, 255, 0.1);
  --country-fill: #2c2c2a;
  --country-stroke: #1a1a19;
  --selected-stroke: #d95926;
  --ocean: #0f1b24;
  --graticule: #24333c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

.app {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

header {
  text-align: center;
  padding: 12px 0 8px;
}

header h1 {
  font-size: 1.75rem;
  margin: 0 0 10px;
}

header p {
  color: var(--text-secondary);
  margin: 0 auto 24px;
  max-width: 60ch;
  line-height: 1.6;
  text-align: left;
}

.layer-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.layer-tab {
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--surface-1);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
}

.layer-tab:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.layer-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-end;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 18px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.search-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

#search {
  font: inherit;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--baseline);
  background: var(--page);
  color: var(--text-primary);
  flex: 1 1 200px;
  min-width: 0;
}

#search:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.clear-selection-btn {
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  background: none;
  border: 1px solid var(--baseline);
  color: var(--text-secondary);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  flex: none;
  white-space: nowrap;
}

.clear-selection-btn:hover {
  border-color: var(--selected-stroke);
  color: var(--selected-stroke);
}

.slider-group {
  flex: 1;
  min-width: 280px;
}

.slider-endpoints {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

#blend {
  width: 100%;
  accent-color: var(--accent);
}

.blend-readout {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 2px;
}

.map-wrap {
  position: relative;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

#map {
  width: 100%;
  height: auto;
  display: block;
}

.sphere {
  fill: var(--ocean);
  stroke: none;
}

.graticule {
  fill: none;
  stroke: var(--graticule);
  stroke-width: 0.6px;
}

.country {
  fill: var(--country-fill);
  stroke: var(--country-stroke);
  stroke-width: 0.4px;
  cursor: pointer;
  transition: fill 0.15s ease;
}

.country.selected {
  stroke: var(--selected-stroke);
  stroke-width: 3.5px;
  filter: drop-shadow(0 0 3px rgba(0, 0, 0, 0.45));
}

.country:hover {
  filter: brightness(1.08);
}

.legend {
  position: absolute;
  left: 14px;
  bottom: 14px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.legend-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.legend-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
}

.legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex: none;
}

@media (max-width: 640px) {
  .legend {
    position: static;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 3px 12px;
    margin-top: 8px;
    max-width: none;
  }

  .legend-title {
    flex-basis: 100%;
    margin-bottom: 2px;
  }

  .legend-row {
    margin-top: 0;
  }
}

.timeline {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 12px 12px;
  padding: 10px 16px;
  margin-top: -1px;
}

.play-btn {
  font: inherit;
  font-size: 0.8rem;
  background: none;
  border: 1px solid var(--baseline);
  color: var(--text-primary);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0 0 2px;
}

.play-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.play-btn.playing {
  padding: 0;
}

#year {
  flex: 1;
  accent-color: var(--accent);
}

.year-readout {
  font-size: 0.85rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  width: 3.5em;
  text-align: right;
  flex: none;
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--text-primary);
  color: var(--surface-1);
  padding: 5px 9px;
  border-radius: 6px;
  font-size: 0.78rem;
  white-space: nowrap;
  transform: translate(-50%, -130%);
  opacity: 0;
  transition: opacity 0.1s ease;
  z-index: 5;
}

.tooltip.visible {
  opacity: 1;
}

.stat-tile .stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 3px;
}

.stat-tile .stat-value {
  font-size: 1.15rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat-tile .stat-sub {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 1px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 11, 11, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 20;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 24px 24px;
  width: 100%;
  max-width: 640px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.modal-header h2 {
  margin: 0;
  font-size: 1.25rem;
}

.modal-close {
  font: inherit;
  font-size: 0.95rem;
  background: none;
  border: 1px solid var(--baseline);
  color: var(--text-secondary);
  border-radius: 6px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  flex: none;
}

.modal-close:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.modal-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.modal-panel {
  background: var(--page);
  border: 1px solid var(--gridline);
  border-radius: 10px;
  padding: 10px;
  text-align: center;
}

.modal-svg {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  display: block;
}

.modal-panel-label {
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 6px;
}

.modal-panel-stat {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.modal-panel-stat strong {
  color: var(--accent-2);
  font-variant-numeric: tabular-nums;
}

.modal-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  border-top: 1px solid var(--gridline);
  padding-top: 14px;
}

.modal-source-note {
  margin-top: 14px;
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.4;
}

@media (max-width: 480px) {
  .modal-panels {
    grid-template-columns: 1fr;
  }
}

.trend-section {
  margin-top: 18px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px 12px;
}

.trend-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.trend-header h2 {
  font-size: 1.05rem;
  margin: 0;
}

.modal-trend-header {
  margin-top: 4px;
  border-top: 1px solid var(--gridline);
  padding-top: 14px;
}

.modal-trend-header h3 {
  font-size: 0.95rem;
  margin: 0;
}

.trend-readout {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.chart-wrap {
  position: relative;
}

.chart-svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.chart-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2px;
}

.chart-axis text {
  fill: var(--text-muted);
  font-size: 9px;
}

.chart-axis path,
.chart-axis line {
  stroke: var(--gridline);
}

.chart-gridline {
  stroke: var(--gridline);
  stroke-width: 1px;
}

.chart-hover-dot {
  fill: var(--accent);
  stroke: var(--surface-1);
  stroke-width: 1.5px;
}

.chart-hover-line {
  stroke: var(--baseline);
  stroke-width: 1px;
  stroke-dasharray: 2, 2;
}

.year-marker {
  stroke: var(--accent-2);
  stroke-width: 2px;
}

.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--text-primary);
  color: var(--surface-1);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.74rem;
  white-space: nowrap;
  transform: translate(-50%, -130%);
  opacity: 0;
  transition: opacity 0.1s ease;
  font-variant-numeric: tabular-nums;
}

.chart-tooltip.visible {
  opacity: 1;
}

.trend-note {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 4px;
}

.trend-note code {
  font-size: 0.68rem;
}

footer {
  margin-top: 24px;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

footer a {
  color: var(--text-secondary);
}