:root {
  --sans-font: -apple-system, BlinkMacSystemFont, "avenir next", avenir,
    helvetica, "helvetica neue", ubuntu, roboto, noto, "segoe ui", arial, sans-serif;
  --content-width: 73rem;
}

/* Dark is the default; light overrides via media query. */
:root {
  --color-accent: #76cbff;
  --color-bg: #171a23;
  --color-text: #ffffff;
  --color-muted: rgba(255, 255, 255, 0.55);
  --color-border: #2e3347;
  --color-card-bg: #1f2433;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-accent: #176da5;
    --color-bg: #f9f9f9;
    --color-text: #000000;
    --color-muted: rgba(0, 0, 0, 0.55);
    --color-border: #dddddd;
    --color-card-bg: #ffffff;
  }
}

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

body {
  font-family: var(--sans-font);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

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

/* ── Header ── */
header {
  border-bottom: 1px solid var(--color-text);
}

header ul {
  max-width: var(--content-width);
  margin: 0 auto;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 2rem;
  transition: padding 0.25s ease;
}

header li:first-child {
  font-weight: 600;
}

header a {
  color: var(--color-text);
  text-decoration: none;
}

header a:hover {
  text-decoration: underline;
}

/* ── Page title ── */
.page-title {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.5rem 2rem 0;
  transition: padding 0.25s ease;
}

.page-title h1 {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.25rem;
}

.page-title h2 {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-muted);
  margin: 0 0 0.5rem;
}

.intro-text {
  font-size: 1rem;
  margin: 0 0 1rem;
}

/* ── Map ── */
#map {
  width: 100%;
  max-width: var(--content-width);
  height: 75vh;
  margin: 0 auto;
  display: block;
  position: relative;
}

.map-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: var(--color-bg);
  color: var(--color-muted);
  font-size: 0.9rem;
  z-index: 1000;
  transition: opacity 0.4s ease;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Override Leaflet's default #ddd pre-tile background */
.leaflet-container {
  background: var(--color-bg);
}

/* Leaflet controls inherit body colours */
.leaflet-control-zoom a,
.leaflet-bar a {
  background: var(--color-card-bg) !important;
  color: var(--color-text) !important;
  border-color: var(--color-border) !important;
}

.info,
.legend {
  background: var(--color-card-bg);
  color: var(--color-text);
  padding: 0.6rem 0.8rem;
  border-radius: 4px;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.25);
  font-size: 0.85rem;
  line-height: 1.5;
}

.info h4 {
  font-weight: 600;
  margin-bottom: 2px;
  font-size: 0.95rem;
}

.info .muted {
  color: var(--color-muted);
  font-size: 0.8rem;
}

.legend-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.legend-row {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  border-radius: 3px;
  padding: 1px 3px;
  margin: 0 -3px;
  transition: background 0.15s ease;
}

.legend-row:hover {
  background: var(--color-border);
}

.legend-row--active {
  background: var(--color-border);
  font-weight: 600;
}

.legend-swatch {
  width: 16px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Stats strip ── */
.stats-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--color-border);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 600;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--color-muted);
}

/* ── Facts strip ── */
.facts-strip {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1rem 2rem 0;
  transition: padding 0.25s ease;
  font-size: 1rem;
}

.facts-strip p + p {
  margin-top: 0.5rem;
}

@media (min-width: 73rem) {
  .facts-strip {
    padding-left: 0;
    padding-right: 0;
  }
}

/* ── Tables ── */
.tables-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2rem 2rem 0;
  transition: padding 0.25s ease;
}

h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
}

th,
td {
  text-align: left;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

td:last-child,
th:last-child {
  text-align: right;
}

/* ── Methodology ── */
.methodology {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
  transition: padding 0.25s ease;
  font-size: 1rem;
}

.methodology p+p {
  margin-top: 0.5rem;
}

.methodology h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}



.attribution {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.map-link {
  color: var(--color-accent);
  text-decoration: none;
  cursor: pointer;
}

.map-link:hover {
  text-decoration: underline;
}

/* ── Analysis version badge ── */
.analysis-version {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 0 0.35rem;
  margin-left: 0.5rem;
  vertical-align: middle;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

/* ── Changelog (collapsible) ── */
.changelog {
  margin-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

.changelog summary {
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  user-select: none;
}

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

.changelog summary::before {
  content: '▶';
  font-size: 0.6rem;
  color: var(--color-muted);
  transition: transform 0.15s ease;
  display: inline-block;
}

.changelog[open] summary::before {
  transform: rotate(90deg);
}

.changelog-body {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--color-muted);
}

.changelog-body h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 1rem 0 0.4rem;
}

.changelog-body h4:first-child {
  margin-top: 0;
}

.changelog-body p {
  margin-bottom: 0.4rem;
  color: var(--color-muted);
}

.changelog-body ul {
  padding-left: 1.2rem;
  margin: 0.3rem 0;
}

.changelog-body li {
  margin-bottom: 0.2rem;
}

.changelog-body table {
  width: 100%;
  margin: 0.5rem 0;
  font-size: 0.78rem;
}

.changelog-body th,
.changelog-body td {
  text-align: left;
  padding: 0.3rem 0.4rem 0.3rem 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-muted);
}

.changelog-body th {
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.changelog-body code {
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--color-border);
  border-radius: 2px;
  padding: 0 0.25em;
}

.changelog-body pre {
  background: var(--color-border);
  border-radius: 4px;
  padding: 0.5rem 0.75rem;
  margin: 0.4rem 0;
  overflow-x: auto;
}

.changelog-body pre code {
  background: none;
  padding: 0;
}

/* ── Locate control ── */
.locate-btn {
  display: flex !important;
  align-items: center;
  justify-content: center;
}

.locate-btn--loading {
  opacity: 0.5;
  pointer-events: none;
}

.locate-btn--loading svg {
  animation: spin 1s linear infinite;
}

.locate-btn--error {
  color: #e31a1c !important;
}

/* ── Search control ── */
.search-control {
  background: var(--color-card-bg);
  padding: 0.4rem;
  border-radius: 4px;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.25);
}

.search-control input {
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 0.3rem 0.5rem;
  border-radius: 3px;
  font-size: 0.85rem;
  width: 148px;
  outline: none;
  font-family: var(--sans-font);
}

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

.search-control input::placeholder {
  color: var(--color-muted);
}

.search-suggestions {
  margin-top: 3px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  overflow: hidden;
}

.search-suggestion {
  padding: 0.25rem 0.5rem;
  font-size: 0.85rem;
  cursor: pointer;
  background: var(--color-card-bg);
  color: var(--color-text);
}

.search-suggestion:hover,
.search-suggestion--active {
  background: var(--color-border);
}

/* ── Range filter (legend) ── */
.range-filter {
  margin-top: 8px;
  border-top: 1px solid var(--color-border);
  padding-top: 6px;
}

.range-wrap {
  position: relative;
  height: 18px;
  margin: 4px 0 2px;
}

.range-track {
  position: absolute;
  top: 7px;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  pointer-events: none;
}

.range-fill {
  position: absolute;
  height: 100%;
  background: var(--color-accent);
  border-radius: 2px;
}

.range-wrap input[type=range] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 18px;
  pointer-events: none;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  margin: 0;
}

.range-wrap input[type=range]::-webkit-slider-thumb {
  pointer-events: all;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  -webkit-appearance: none;
  border: 2px solid var(--color-card-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.range-wrap input[type=range]::-moz-range-thumb {
  pointer-events: all;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  border: 2px solid var(--color-card-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.range-wrap input[type=range]::-webkit-slider-runnable-track {
  background: transparent;
}

.range-wrap input[type=range]::-moz-range-track {
  background: transparent;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 2px;
}

/* ── Responsive ── */

/* Drop horizontal padding once the viewport is wide enough that
   max-width: var(--content-width) kicks in — keeps content flush
   with the map edges. Must match --content-width (73rem). */
@media (min-width: 73rem) {
  header ul,
  .page-title,
  .tables-row,
  .methodology {
    padding-left: 0;
    padding-right: 0;
  }
}

@media (max-width: 560px) {
  .tables-row {
    grid-template-columns: 1fr;
  }

  .stats-strip {
    gap: 1rem;
  }
}