/**
 * Mermaid diagram enhancements
 * Zoom, pan, and accessibility support
 * Tested with MkDocs Material + Mermaid
 */

/* Wrapper created by JS */
.mermaid-zoom-wrapper {
  position: relative;
  overflow: visible; /* IMPORTANT: do NOT clip controls */
  border: 1px solid var(--md-default-fg-color--lightest, #e0e0e0);
  border-radius: 4px;
  padding: 1rem;
  margin: 1.5rem 0;
  background-color: var(--md-code-bg-color, #f5f5f5);
}

/* Mermaid container */
.mermaid-zoom-wrapper pre.mermaid {
  margin: 0;
  padding: 0;
  background: transparent;
  border: none;
}

/* SVG behavior */
.mermaid-zoom-wrapper svg {
  width: 100%;
  max-width: none;
  height: auto;
  cursor: grab;
  transform-origin: 0 0;
  transition: transform 0.15s ease;
}

.mermaid-zoom-wrapper svg:active {
  cursor: grabbing;
}

/* Zoom controls */
.mermaid-zoom-controls {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  gap: 0.25rem;
  padding: 0.25rem;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 4px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  z-index: 1000; /* Must beat MkDocs layers */
}

/* Buttons */
.mermaid-zoom-controls button {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 3px;
  background: var(--md-primary-fg-color, #4051b5);
  color: #fff;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mermaid-zoom-controls button:hover {
  background: var(--md-accent-fg-color, #526cfe);
}

.mermaid-zoom-controls button:active {
  transform: scale(0.95);
}

/* Hint text */
.mermaid-zoom-wrapper::before {
  content: "💡 Use + / − or Ctrl + Scroll to zoom • Drag to pan";
  display: block;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  font-style: italic;
  color: var(--md-default-fg-color--light, #666);
}

/* Improve node readability */
.mermaid-zoom-wrapper .node rect,
.mermaid-zoom-wrapper .node circle,
.mermaid-zoom-wrapper .node ellipse,
.mermaid-zoom-wrapper .node polygon {
  stroke-width: 2px;
}

/* Text color consistency */
.mermaid-zoom-wrapper text {
  fill: var(--md-default-fg-color, #333);
}

/* Mobile behavior */
@media (max-width: 768px) {
  .mermaid-zoom-controls {
    display: none; /* pinch-zoom only on mobile */
  }

  .mermaid-zoom-wrapper::before {
    content: "💡 Pinch to zoom • Drag to pan";
    font-size: 0.75rem;
  }
}

/* Print cleanup */
@media print {
  .mermaid-zoom-controls,
  .mermaid-zoom-wrapper::before {
    display: none;
  }

  .mermaid-zoom-wrapper svg {
    transform: none !important;
  }
}