body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

#map {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 100%;
}

.map-overlay {
  position: absolute;
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  padding: 12px 12px;
  border-radius: 8px;
  max-width: 320px;
  z-index: 1;
}

#titleBox {
  top: 12px;
  left: 12px;
}

#legend {
  bottom: 24px;
  left: 12px;
}

.title {
  font-size: 16px;
  font-weight: 700;
}

.subtitle {
  font-size: 13px;
  margin-top: 4px;
}

.source {
  font-size: 12px;
  opacity: 0.9;
  margin-top: 8px;
  line-height: 1.3;
}

.legend-title {
  font-weight: 700;
  margin-bottom: 6px;
}

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

.legend-color {
  width: 16px;
  height: 16px;
  margin-right: 8px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.legend-color.c1 { background: #ffffcc; }
.legend-color.c2 { background: #a1dab4; }
.legend-color.c3 { background: #41b6c4; }
.legend-color.c4 { background: #2c7fb8; }
.legend-color.c5 { background: #253494; }

.legend-circle {
  display: inline-block;
  border-radius: 50%;
  margin-right: 10px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: rgba(227, 74, 51, 0.75);
}

.legend-circle.s1 { width: 8px; height: 8px; }
.legend-circle.s2 { width: 18px; height: 18px; }
.legend-circle.s3 { width: 30px; height: 30px; }
.legend-circle.s4 { width: 44px; height: 44px; }