/* Diagrams stay compact in the article; the same SVG moves into the viewer. */
.diagram-figure {
  margin: 1.8em 0;
  padding: 14px;
  border: 1px solid #dce4eb;
  border-radius: 8px;
  background: #fff;
  scroll-margin-top: 80px;
}

.diagram-preview {
  min-width: 0;
  overflow: auto;
}

.diagram-preview > svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.diagram-caption {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  margin-top: 12px;
  color: #566372;
  font-size: 14px;
  line-height: 1.6;
}

.diagram-open,
.diagram-viewer button {
  min-height: 40px;
  padding: 6px 12px;
  border: 1px solid #a9bdce;
  border-radius: 5px;
  background: #f5f8fb;
  color: #203e58;
  font: inherit;
  line-height: 1.5;
  cursor: pointer;
}

.diagram-caption a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.diagram-open:hover,
.diagram-viewer button:hover {
  background: #e8f0f7;
}

.diagram-open:focus-visible,
.diagram-viewer button:focus-visible,
.diagram-viewer-viewport:focus-visible {
  outline: 3px solid #43759e;
  outline-offset: 3px;
}

.diagram-failed .diagram-caption {
  margin: 0 0 12px;
}

.diagram-failed pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.diagram-render-target {
  position: absolute;
  top: 0;
  left: -100000px;
  width: 920px;
  visibility: hidden;
}

html.diagram-viewer-open {
  overflow: hidden;
  scrollbar-gutter: stable;
}

.diagram-viewer {
  box-sizing: border-box;
  width: min(1440px, calc(100vw - 32px));
  max-width: none;
  height: min(960px, calc(100dvh - 32px));
  max-height: none;
  padding: 18px;
  margin: auto;
  overflow: hidden;
  border: 1px solid #a9bdce;
  border-radius: 10px;
  background: #fff;
  color: #20384d;
  font-size: 15px;
  line-height: 1.5;
  box-shadow: 0 12px 50px rgba(0, 0, 0, 0.25);
}

.diagram-viewer[open] {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.diagram-viewer::backdrop {
  background: rgba(15, 30, 44, 0.7);
}

.diagram-viewer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.diagram-viewer-header h2 {
  min-width: 0;
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.diagram-viewer-close {
  flex: 0 0 auto;
}

.diagram-viewer-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.diagram-viewer-toolbar button {
  min-width: 44px;
}

.diagram-viewer button:disabled {
  opacity: 0.45;
  cursor: default;
}

.diagram-viewer-scale {
  min-width: 4.5em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.diagram-viewer-help {
  margin: 0;
  color: #566372;
  font-size: 13px;
}

.diagram-viewer-viewport {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  border: 1px solid #dce4eb;
  border-radius: 5px;
  background: #fff;
  cursor: grab;
  touch-action: none;
  overscroll-behavior: contain;
  user-select: none;
}

.diagram-viewer-viewport.is-dragging {
  cursor: grabbing;
}

.diagram-viewer-canvas {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
}

.diagram-viewer-svg {
  display: block;
  overflow: visible;
}

@media (max-width: 575.98px) {
  .diagram-figure { padding: 10px; }
  .diagram-viewer {
    width: 100vw;
    height: 100dvh;
    padding: 12px;
    border: 0;
    border-radius: 0;
  }
  .diagram-open,
  .diagram-viewer button { min-height: 44px; }
}

@media (max-height: 450px) {
  .diagram-viewer { padding: 8px; }
  .diagram-viewer[open] { gap: 6px; }
  .diagram-viewer-help { display: none; }
}

@media print {
  .diagram-open,
  .diagram-viewer { display: none !important; }
  .diagram-figure { break-inside: avoid; }
}