body {
  font-family: Helvetica, Arial, sans-serif;
  margin: 20px;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.control-button {
  padding: 6px 10px;
  border: 1px solid #888;
  background: #fff;
  color: #222;
  border-radius: 4px;
  cursor: pointer;
}

.control-button.is-active {
  border-color: #444;
  background: #111;
  color: #fff;
}

.control-button.is-disabled {
  cursor: default;
  opacity: 0.45;
}

.toolbar-link {
  color: #0000ee;
  font-size: 14px;
  text-decoration: underline;
}

#chart {
  max-width: 100%;
  height: auto;
}