body {
  font-family: Arial, Helvetica, sans-serif;
  color: #222;
  font-weight: 100;
  margin-top: 20px;
  text-align: center;
}

#controls {
  margin-top: 16px;
  text-align: center;
}

#controls button {
  margin: 30px 10px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3px;
  cursor: pointer;

  background: #fff;
  color: #501e4c;
  border: 1.5px solid #501e4c;
  border-radius: 16px;

  transition: background 0.2s ease, color 0.2s ease;
}

#controls button:hover {
  background: #501e4c;
  color: #fff;
}

#controls button.active {
  background: #501e4c;
  color: #fff;
}

text.label {
  font-size: 12px;
  font-weight: 100;
  fill: #fff;
  pointer-events: none;
}

#tooltip {
  position: absolute;
  display: none;
  padding: 5px 5px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid #ccc;
  font-size: 12px;
  line-height: 1.4;
}