svg text {
  font-weight: 500;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.tooltip {
  position: absolute;
  text-align: center;
  width: 112px;
  height: auto;
  padding: 4px;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #ccc;
  border-radius: 4px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s;
  font-weight: 500;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.overlay {
  fill: none;
  pointer-events: all;
}

.title {
  font-size: 20px;
  font-weight: 600;
  text-anchor: middle;
}

.grid line {
  stroke: #dddddd;
  stroke-width: 1px;
  stroke-dasharray: 2,2;
}