:root {
  --bg: #0b1220;
  --panel: rgba(255, 255, 255, 0.92);
  --text: #0b1220;
  --muted: #5b677a;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: #fff;
}

header {
  padding: 16px 20px;
  display: flex;
  gap: 16px;
  align-items: baseline;
  justify-content: space-between;
}

.header-main {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-nav {
  display: flex;
  gap: 10px;
  align-items: center;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.06);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  transition:
    background 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.26);
  transform: translateY(-1px);
}

.nav-link-primary {
  background: rgba(96, 165, 250, 0.2);
  border-color: rgba(96, 165, 250, 0.38);
}

h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 650;
  letter-spacing: 0.2px;
}

.sub {
  color: rgba(255, 255, 255, 0.75);
  font-size: 13px;
}

#map {
  width: min(1600px, 100%);
  height: min(800px, calc(100vh - 76px));
  margin: 0 auto;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  background: rgba(255, 255, 255, 0.08);
  padding: 8px 10px;
  border-radius: 10px;
  backdrop-filter: blur(10px);
}

.controls label {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.85);
}

.controls select {
  appearance: none;
  border: 0;
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text);
  background: var(--panel);
  outline: none;
  cursor: pointer;
}

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.controls .divider {
  width: 1px;
  height: 20px;
  background: rgba(255, 255, 255, 0.18);
  margin: 0 2px;
}

.controls input[type="range"] {
  width: 160px;
}

.controls .value {
  min-width: 44px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: rgba(255, 255, 255, 0.92);
  font-size: 12px;
}

.legend {
  position: fixed;
  right: 14px;
  bottom: 14px;
  width: 260px;
  border-radius: 14px;
  padding: 12px 12px 10px;
  background: rgba(255, 255, 255, 0.92);
  color: #0b1220;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
}

.legend-title {
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 10px;
}

.legend-row {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 12px;
  color: #1c2a3b;
  margin: 6px 0;
}

.legend-sep {
  height: 1px;
  background: rgba(11, 18, 32, 0.12);
  margin: 10px 0;
}

.swatch {
  width: 14px;
  height: 14px;
  border-radius: 6px;
  display: inline-block;
}

.swatch-region {
  background: #f59e0b;
}

.swatch-pop {
  background: #64748b;
}

.swatch-heat {
  width: 56px;
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    #60a5fa 0%,
    #34d399 28%,
    #facc15 58%,
    #fb923c 80%,
    #ef4444 100%
  );
}

.legend-heat-scale {
  display: flex;
  justify-content: space-between;
  margin: 0 0 10px;
  font-size: 11px;
  color: rgba(11, 18, 32, 0.62);
  font-variant-numeric: tabular-nums;
}

.legend-kv {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 6px 10px;
  font-size: 12px;
}

.legend-kv .k {
  color: rgba(11, 18, 32, 0.6);
}

.legend-kv .v {
  color: rgba(11, 18, 32, 0.92);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 900px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }
}