.scene-source-morph {
  position: relative;
}

.scene-source-morph .sm-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
}

.scene-source-morph .sm-panel {
  min-width: 0;
  padding: 14px 16px;
  background: var(--surface-muted);
  border-radius: var(--radius);
}

.scene-source-morph .sm-code {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  overflow-x: auto;
}

.scene-source-morph .sm-line {
  display: inline-block;
  min-width: 100%;
  padding-inline: 6px;
  border-left: 3px solid transparent;
  border-radius: 4px;
  transition:
    opacity 400ms ease,
    transform 400ms ease,
    background 250ms ease;
}

.scene-source-morph .sm-line.is-current {
  background: var(--accent-soft);
  border-left-color: var(--accent);
  transform: translateX(10px);
}

.scene-source-morph .sm-line.is-peeled {
  opacity: 0.35;
  transform: translateX(22px);
}

.scene-source-morph .sm-rule {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-strong);
}

.scene-source-morph .sm-rule > summary {
  cursor: pointer;
}

.scene-source-morph .sm-rule-name {
  margin: 0 0 6px;
}

.scene-source-morph .sm-rule-clause {
  margin: 0;
  padding: 10px 12px;
  color: var(--primary);
  background: var(--surface);
  border-radius: var(--radius-sm);
  font-size: 0.74rem;
  line-height: 1.5;
  overflow-x: auto;
}

/* Drawn tall and narrow; capped well below its 380 so the figure is not mostly graph. */
.scene-source-morph .sm-svg {
  max-width: 296px;
}

.scene-source-morph .sm-arrow-head {
  fill: var(--text-muted);
}

.scene-source-morph .sm-edge line,
.scene-source-morph .sm-edge path {
  fill: none;
  stroke: var(--text-muted);
  stroke-width: 1.6;
}

.scene-source-morph .sm-edge text {
  fill: var(--text-muted);
  font: 11.5px var(--mono);
}

.scene-source-morph .sm-node rect {
  fill: var(--surface);
  stroke: var(--primary);
  stroke-width: 2;
}

.scene-source-morph .sm-special rect {
  fill: #fffbea;
  stroke: #d99a2b;
}

.scene-source-morph .sm-node text {
  fill: var(--text);
  font: 700 12.5px var(--mono);
}

.scene-source-morph .sm-node text:not([text-anchor]) {
  text-anchor: middle;
}

.scene-source-morph .sm-node .sm-num {
  fill: var(--text-faint);
  font: 10.5px var(--mono);
}

.scene-source-morph .sm-node .sm-num:not([text-anchor="middle"]) {
  text-anchor: end;
}

.scene-source-morph .sm-node,
.scene-source-morph .sm-edge {
  transition: opacity 450ms ease;
}

.scene-source-morph .is-hidden {
  opacity: 0;
}

.scene-source-morph .sm-node.is-pending {
  opacity: 0.7;
}

.scene-source-morph .sm-node.is-pending rect {
  fill: none;
  stroke: var(--border-strong);
  stroke-dasharray: 5 4;
}

.scene-source-morph .sm-node.is-pending text {
  fill: var(--text-faint);
}

.scene-source-morph .sm-node.is-new rect {
  fill: var(--accent-soft);
  stroke: var(--accent);
  stroke-width: 3;
}

.scene-source-morph .sm-edge.is-new line,
.scene-source-morph .sm-edge.is-new path {
  stroke: var(--accent);
  stroke-width: 2.6;
}

.scene-source-morph .sm-edge.is-new text {
  fill: var(--accent);
  font-weight: 700;
}

.scene-source-morph .sm-ghost {
  position: absolute;
  z-index: 2;
  padding: 2px 8px;
  color: var(--accent);
  background: var(--surface);
  border: 1.5px solid var(--accent);
  border-radius: 6px;
  box-shadow: var(--shadow);
  font: 700 0.85rem var(--mono);
  white-space: nowrap;
  pointer-events: none;
  transition:
    transform 800ms cubic-bezier(0.3, 0.7, 0.2, 1),
    opacity 800ms ease-in;
}

.scene-source-morph .sm-caption {
  min-height: 3.4em;
}

.scene-source-morph .sm-claim {
  margin: 10px 0 0;
  padding: 10px 14px;
  color: var(--success);
  background: var(--success-soft);
  border-radius: var(--radius-sm);
  font-weight: 650;
  opacity: 0.35;
  transition: opacity 400ms ease;
}

.scene-source-morph.is-final .sm-claim,
.scene-source-morph:not(:has(.sm-controls:not([hidden]))) .sm-claim {
  opacity: 1;
}

@media (max-width: 900px) {
  .scene-source-morph .sm-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}