/* ==========================================================================
   QMDC Mermaid — natural-size rendering + zoom/pan viewport
   Ported from the original preview/static-site renderer into MkDocs.
   Uses Material CSS custom properties (design tokens) — no hardcoded colors.
   ========================================================================== */

/* Diagram container is the positioning context for the floating toolbar. */
.mermaid {
  margin: 1.5em 0;
  position: relative;
}

/* Scroll wrapper. Only ever scrolls horizontally (when the diagram is zoomed
   wider than the column). Its height follows the scaled SVG, so the whole
   diagram stays visible top-to-bottom and the page scrolls normally — the
   diagram is never clipped into a fixed-height box. */
.mermaid-viewport {
  position: relative;
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.4rem;
  background: var(--md-code-bg-color);
}

.mermaid-viewport.mermaid-pannable {
  cursor: grab;
}

.mermaid-viewport.mermaid-pannable.grabbing {
  cursor: grabbing;
}

.mermaid-viewport:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: -2px;
}

.mermaid-viewport svg {
  display: block;
}

/* Floating toolbar — faint until the diagram is hovered/focused. */
.mermaid-toolbar {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 0.4rem;
  background: var(--md-default-bg-color);
  border: 1px solid var(--md-default-fg-color--lightest);
  box-shadow: var(--md-shadow-z2);
  z-index: 2;
  opacity: 0.35;
  transition: opacity 0.15s ease;
}

.mermaid:hover .mermaid-toolbar,
.mermaid:focus-within .mermaid-toolbar {
  opacity: 1;
}

.mermaid-btn {
  min-width: 26px;
  height: 26px;
  padding: 0 6px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--md-default-fg-color);
  font-size: 0.95em;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mermaid-btn:hover {
  background: color-mix(in srgb, var(--md-accent-fg-color) 12%, transparent);
  color: var(--md-accent-fg-color);
}

.mermaid-zoom-label {
  min-width: 3.2em;
  text-align: center;
  font-size: 0.75em;
  color: var(--md-default-fg-color--light);
  user-select: none;
}