/* Interactive viewer for inlined SVG diagrams (see _ext/svg_viewer.py). */

.svg-viewer {
  margin: 1.5rem 0;
}

.svg-viewer__stage {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--pst-color-border, #ced4da);
  border-radius: 0.5rem;
  background: var(--pst-color-background, #fff);
  cursor: zoom-in;
  /* Vertical swipes still scroll the page; everything else (horizontal pan,
     pinch) is handled by the viewer. */
  touch-action: pan-y;
}

/* Links inside the diagram must look like links, not like the zoom surface. */
.svg-viewer__stage a {
  cursor: pointer;
}

.svg-viewer__stage:focus-visible {
  outline: 2px solid var(--pst-color-primary, #0a7d91);
  outline-offset: 2px;
}

.svg-viewer__canvas {
  transform-origin: 0 0;
  will-change: transform;
}

.svg-viewer__canvas > svg {
  display: block;
  width: 100%;
  height: auto;
}

.svg-viewer__hint,
.svg-viewer__caption {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--pst-color-text-muted, #6c757d);
}

.svg-viewer__caption {
  font-size: 0.875rem;
}

/* --- Toolbar --------------------------------------------------------- */

.svg-viewer__toolbar {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: flex;
  gap: 0.25rem;
  padding: 0.25rem;
  border-radius: 0.375rem;
  background: var(--pst-color-surface, #f8f9fa);
  border: 1px solid var(--pst-color-border, #ced4da);
  opacity: 0;
  transition: opacity 0.15s ease-in-out;
}

.svg-viewer__stage:hover .svg-viewer__toolbar,
.svg-viewer__stage:focus-within .svg-viewer__toolbar,
.svg-viewer.is-expanded .svg-viewer__toolbar {
  opacity: 1;
}

.svg-viewer__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 0;
  border-radius: 0.25rem;
  background: transparent;
  color: var(--pst-color-text-base, #212529);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.svg-viewer__btn:hover:not(:disabled) {
  /* Neutral overlay so it reads correctly in both the light and dark theme. */
  background: rgba(128, 128, 128, 0.25);
}

.svg-viewer__btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.svg-viewer__btn:focus-visible {
  outline: 2px solid var(--pst-color-primary, #0a7d91);
  outline-offset: -2px;
}

/* --- Expanded overlay ------------------------------------------------ */

.svg-viewer.is-expanded .svg-viewer__stage {
  position: fixed;
  inset: 0;
  z-index: 1080;
  border: 0;
  border-radius: 0;
  background: var(--pst-color-background, #fff);
  cursor: grab;
  touch-action: none;
}

/* Declared last so it also wins inside the expanded overlay. */
.svg-viewer .svg-viewer__stage.is-panning {
  cursor: grabbing;
}

body.svg-viewer-open {
  overflow: hidden;
}

/* Keep the document layout stable while the stage is lifted out of flow. */
.svg-viewer.is-expanded .svg-viewer__hint,
.svg-viewer.is-expanded .svg-viewer__caption {
  visibility: hidden;
}

@media (prefers-reduced-motion: reduce) {
  .svg-viewer__toolbar {
    transition: none;
  }
}