.diagram-zoom-controls {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 6px;
  z-index: 20;
}

.diagram-zoom-controls button {
  min-width: 32px;
  height: 32px;
  padding: 0 10px;
  border-radius: 6px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: rgba(255, 255, 255, 0.9);
  color: var(--md-typeset-color, #333);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.diagram-zoom-controls button:hover {
  background: rgba(0, 0, 0, 0.08);
}