.lab {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.lab:focus-visible {
  outline: 3px solid rgba(8, 120, 255, 0.28);
  outline-offset: 4px;
}

.graph-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-left: auto;
}

@keyframes trace-edge {
  to {
    stroke-dashoffset: 0;
  }
}

.preset-control {
  position: relative;
  display: flex;
  gap: 10px;
  align-items: center;
  min-height: 40px;
  padding-left: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.preset-control > span {
  display: grid;
  align-self: center;
  height: 40px;
  padding-top: 1px;
  place-items: center;
  line-height: 1;
}

.preset-control::after {
  position: absolute;
  top: 50%;
  right: 14px;
  width: 5px;
  height: 5px;
  transform: translateY(-70%) rotate(45deg);
  border-right: 1px solid var(--muted);
  border-bottom: 1px solid var(--muted);
  content: "";
  pointer-events: none;
}

.preset-control select {
  min-width: 142px;
  height: 40px;
  padding: 0 32px 0 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font-family: var(--body);
  font-size: 13px;
  font-style: normal;
  font-weight: 500;
  line-height: 40px;
  letter-spacing: 0;
  text-transform: none;
  appearance: none;
}

.preset-control select:focus-visible,
input[type="range"]:focus-visible {
  outline: 3px solid rgba(8, 120, 255, 0.3);
  outline-offset: 4px;
}

.preset-control option {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 13px;
  font-weight: 400;
}

.lab-grid {
  display: grid;
  grid-template-columns: 202px minmax(0, 1fr) 286px;
  height: clamp(620px, calc(100svh - 280px), 800px);
  min-height: 620px;
}

html[data-embed="true"] .lab-grid {
  height: 100%;
  min-height: 0;
}

html[data-embed="true"] .stage-rail {
  padding: 14px 12px;
  scrollbar-width: none;
}

html[data-embed="true"] .stage-rail::-webkit-scrollbar {
  display: none;
}

html[data-embed="true"] .rail-heading {
  margin-bottom: 10px;
}

html[data-embed="true"] .stage-group-title {
  margin-top: 10px;
  margin-bottom: 3px;
}

html[data-embed="true"] .stage-button {
  padding-block: 7px;
}

html[data-embed="true"] .canvas-card,
html[data-embed="true"] .graph-canvas-wrap,
html[data-embed="true"] .graph-canvas {
  min-height: 0;
}

html[data-embed="true"] .graph-pane {
  height: 100%;
}

html[data-embed="true"] .canvas-meta {
  min-height: 64px;
}

html[data-embed="true"] .control-panel {
  padding: 18px;
}

.stage-rail {
  min-height: 0;
  padding: 24px 17px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-right: 1px solid var(--line);
  background: #f9fbfb;
  scrollbar-color: var(--line-strong) transparent;
  scrollbar-width: thin;
}

.stage-rail::-webkit-scrollbar {
  width: 5px;
}

.stage-rail::-webkit-scrollbar-thumb {
  border-radius: 99px;
  background: var(--line-strong);
}

.rail-heading {
  display: flex;
  justify-content: space-between;
  margin: 0 8px 18px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.stage-rail ol {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.stage-group-title {
  margin: 20px 9px 6px;
  color: var(--ink);
  font-family: var(--display);
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.stage-group-title:first-child {
  margin-top: 0;
}

.stage-button {
  position: relative;
  display: grid;
  grid-template-columns: 25px 1fr;
  gap: 9px;
  align-items: start;
  width: 100%;
  padding: 11px 10px;
  border: 0;
  border-radius: 10px;
  color: var(--muted);
  background: transparent;
  text-align: left;
  transition: color 150ms ease, background 150ms ease;
}

.stage-button:hover {
  color: var(--ink);
  background: var(--mist);
}

.stage-button.is-active {
  color: var(--ink);
  background: white;
  box-shadow: 0 5px 18px rgba(33, 65, 72, 0.07);
}

.stage-button.is-active::before {
  position: absolute;
  top: 13px;
  bottom: 13px;
  left: -1px;
  width: 2px;
  border-radius: 4px;
  background: var(--blue);
  content: "";
}

.stage-number {
  padding-top: 2px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
}

.stage-button.is-active .stage-number {
  color: var(--blue);
}

.stage-name {
  font-size: 12px;
  font-weight: 700;
  line-height: 1.35;
}

.canvas-column {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: white;
}

.canvas-card {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 620px;
}

.canvas-meta {
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 10px 18px 10px 24px;
  border-bottom: 1px solid var(--line);
}

.canvas-meta strong {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.15;
  white-space: nowrap;
}

.graph-canvas-wrap {
  position: relative;
  flex: 1;
  min-height: 430px;
  overflow: hidden;
  background:
    linear-gradient(rgba(18, 40, 47, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 40, 47, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 50% 45%, #fff 0, #fbfdfd 58%, #f4f8f8 100%);
  background-size: 28px 28px, 28px 28px, auto;
}

.dual-graph-layout {
  min-height: inherit;
}

.dual-graph-layout {
  position: relative;
  z-index: 1;
  height: 100%;
}

.graph-pane {
  position: relative;
  min-width: 0;
  min-height: inherit;
}

.pane-label,
.transfer-lane,
.output-pane {
  display: none;
}

.graph-canvas-wrap::after {
  position: absolute;
  inset: 24px;
  border: 1px solid rgba(18, 40, 47, 0.045);
  border-radius: 50%;
  content: "";
  pointer-events: none;
}

.graph-canvas-wrap.is-outputting {
  padding: 14px;
}

.graph-canvas-wrap.is-outputting::after {
  display: none;
}

.is-outputting .dual-graph-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 68px minmax(0, 1fr);
  grid-template-rows: minmax(400px, 1fr) auto;
  gap: 8px;
}

.is-outputting .graph-pane {
  min-height: 400px;
  overflow: hidden;
  border: 1px solid rgba(18, 40, 47, 0.1);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 12px 30px rgba(28, 58, 65, 0.045);
}

.is-outputting .output-pane {
  display: flex;
  flex-direction: column;
  background: rgba(248, 251, 255, 0.9);
}

.is-outputting .pane-label {
  position: absolute;
  z-index: 4;
  top: 16px;
  right: 18px;
  left: 18px;
  display: flex;
  justify-content: space-between;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.is-outputting .transfer-lane {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-deep);
}

.transfer-arrow {
  font-size: 22px;
}

.graph-canvas {
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 430px;
}

.is-outputting .graph-canvas {
  min-height: 400px;
}

.output-tour-strip {
  display: none;
}

.is-outputting .output-pane .graph-canvas {
  flex: 1;
  min-height: 0;
}

.is-outputting .output-tour-strip {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-width: 0;
  min-height: 42px;
  padding: 9px 14px;
  overflow: hidden;
  border: 1px solid rgba(18, 40, 47, 0.1);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 22px rgba(28, 58, 65, 0.035);
}

.output-tour-strip > span {
  color: var(--ink-soft);
  font-family: var(--display);
  font-size: 13px;
  font-weight: 600;
}

#output-tour-sequence {
  display: flex;
  align-items: center;
  min-width: 0;
  padding: 2px 3px 6px;
  overflow-x: auto;
  color: var(--ink-soft);
  scrollbar-width: thin;
  white-space: nowrap;
}

.tour-vertex {
  display: inline-grid;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 1px solid #b8c7ca;
  border-radius: 50%;
  background: #fff;
  color: var(--ink-soft);
  font-family: var(--display);
  font-size: 11px;
  font-style: italic;
  font-weight: 600;
  transition: background 220ms ease, border-color 220ms ease, color 220ms ease;
}

.tour-vertex.is-current {
  border-color: var(--blue-deep);
  background: var(--blue);
  color: #fff;
  box-shadow: 0 0 0 3px rgba(8, 120, 255, 0.12);
}

.tour-edge {
  --tour-edge-color: #b8c7ca;
  position: relative;
  flex: 0 0 24px;
  width: 24px;
  height: 2px;
  background: var(--tour-edge-color);
}

.tour-edge::after {
  position: absolute;
  top: 50%;
  right: -1px;
  width: 6px;
  height: 6px;
  border-top: 2px solid var(--tour-edge-color);
  border-right: 2px solid var(--tour-edge-color);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.tour-edge.is-skeleton {
  --tour-edge-color: var(--blue);
}

.tour-edge.is-batch-orange {
  --tour-edge-color: var(--orange);
}

.tour-edge.is-batch-green {
  --tour-edge-color: var(--green);
}

.tour-edge.is-batch-purple {
  --tour-edge-color: var(--purple);
}

.graph-edge {
  fill: none;
  stroke: #c9d4d6;
  stroke-linecap: round;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
  transition:
    stroke 420ms cubic-bezier(0.22, 0.7, 0.2, 1),
    stroke-width 420ms cubic-bezier(0.22, 0.7, 0.2, 1),
    opacity 420ms cubic-bezier(0.22, 0.7, 0.2, 1);
}

.graph-edge.is-muted {
  opacity: 0.2;
  stroke: #b9c7c9;
  stroke-width: 1;
}

.graph-edge.is-tree {
  opacity: 1;
  stroke: var(--teal);
  stroke-width: 2.5;
}

.graph-edge.is-forest {
  opacity: 1;
  stroke: var(--orange);
  stroke-width: 2.5;
}

.graph-edge.is-skeleton {
  opacity: 1;
  stroke: var(--blue);
  stroke-width: 2.7;
}

.graph-edge.is-batch-orange,
.memory-row.memory-batch-orange {
  --batch-color: var(--orange);
}

.graph-edge.is-batch-green,
.memory-row.memory-batch-green {
  --batch-color: var(--green);
}

.graph-edge.is-batch-purple,
.memory-row.memory-batch-purple {
  --batch-color: var(--purple);
}

.graph-edge.is-circuit {
  opacity: 1;
  stroke: var(--batch-color);
  stroke-width: 2.8;
}

.graph-edge.is-output-pending {
  opacity: 0.34;
  stroke-width: 2;
}

.graph-edge.is-output-written-source {
  opacity: 0.07;
  stroke: #8fa1a5;
  stroke-width: 1;
}

.graph-edge.is-output-next {
  opacity: 1;
  stroke-width: 3.4;
}

.graph-edge.output-edge {
  opacity: 1;
  stroke-width: 2.9;
}

.graph-edge.output-edge.is-new-output {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: trace-edge 480ms cubic-bezier(0.22, 0.7, 0.2, 1) forwards;
}

.graph-node circle {
  fill: white;
  stroke: var(--ink);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
  transition:
    fill 300ms cubic-bezier(0.22, 0.7, 0.2, 1),
    stroke 300ms cubic-bezier(0.22, 0.7, 0.2, 1);
}

.graph-node text {
  fill: var(--ink);
  font-family: var(--display);
  font-size: 20px;
  font-style: italic;
  font-weight: 600;
  pointer-events: none;
  text-anchor: middle;
}

.graph-node.is-active circle {
  fill: var(--blue);
  stroke: var(--blue-deep);
}

.graph-node.is-active text:first-of-type {
  fill: white;
}

.graph-node.is-output-current circle {
  fill: var(--blue);
  stroke: white;
  stroke-width: 2;
}

.graph-node.is-output-current text:first-of-type {
  fill: white;
}

.graph-node.is-output-node circle {
  fill: rgba(255, 255, 255, 0.45);
  stroke: #c7d3d5;
  stroke-dasharray: 3 3;
}

.graph-node.is-output-node text {
  fill: #a0aeb1;
}

.graph-node.is-output-node.is-output-seen circle {
  fill: white;
  stroke: var(--ink-soft);
  stroke-dasharray: none;
}

.graph-node.is-output-node.is-output-seen text {
  fill: var(--ink);
}

.graph-node.is-output-node.is-output-current circle {
  fill: var(--blue);
  stroke: white;
}

.graph-node.is-output-node.is-output-current text {
  fill: white;
}

.control-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  padding: 24px;
  border-left: 1px solid var(--line);
  background: #f9fbfb;
}

.panel-top {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.control-panel .graph-actions {
  width: 100%;
  margin: 0;
}

.control-panel .preset-control {
  width: 100%;
}

.control-panel .preset-control select {
  flex: 1;
  min-width: 0;
}

.panel-explanation {
  display: flex;
  flex: 0 0 auto;
  align-items: flex-start;
  min-height: 0;
  padding: 20px 0 16px;
}

.panel-copy {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--display);
  font-size: 15px;
  line-height: 1.62;
}

.panel-copy code {
  color: var(--ink);
  background: transparent;
  font-family: inherit;
  font-style: italic;
  font-size: inherit;
  white-space: nowrap;
}

.memory-view {
  width: 100%;
  margin: auto 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.memory-heading {
  margin-bottom: 16px;
}

.memory-title-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.memory-title-row > span {
  color: var(--ink);
  font-family: var(--display);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
}

.memory-title-row strong {
  color: var(--blue-deep);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  white-space: nowrap;
}

.memory-rows {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 76px;
}

.memory-empty {
  color: var(--muted);
  font-family: var(--display);
  font-size: 12px;
  font-style: italic;
  line-height: 1.5;
}

.memory-row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr) 22px;
  gap: 8px;
  align-items: center;
}

.memory-name {
  display: flex;
  gap: 5px;
  align-items: baseline;
  min-width: 0;
  color: var(--ink-soft);
  line-height: 1;
}

.memory-name i {
  flex: 0 0 auto;
  font-family: var(--display);
  font-size: 14px;
  font-weight: 600;
}

.memory-name span {
  min-width: 0;
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 9px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.memory-track {
  position: relative;
  height: 8px;
  overflow: hidden;
  border: 1px solid rgba(191, 207, 209, 0.72);
  border-radius: 3px;
  background: var(--line);
}

.memory-track::after {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
    90deg,
    transparent calc(100% - 1px),
    rgba(255, 255, 255, 0.82) calc(100% - 1px)
  );
  background-size: calc(100% / var(--memory-slots, 6)) 100%;
  content: "";
  pointer-events: none;
}

.memory-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--memory-color, var(--ink-soft));
  transition: width 460ms cubic-bezier(0.22, 0.7, 0.2, 1);
}

.memory-row.memory-vertices {
  --memory-color: var(--ink-soft);
}

.memory-row.memory-tree {
  --memory-color: var(--teal);
}

.memory-row.memory-forest {
  --memory-color: var(--orange);
}

.memory-row[class*="memory-batch-"] {
  --memory-color: var(--batch-color);
}

.memory-row.memory-skeleton {
  --memory-color: var(--blue);
}

.memory-row.memory-carry {
  --memory-color: var(--ink-soft);
}

.memory-count {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  text-align: right;
}

.header-playback {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: flex-end;
  width: min(100%, 520px);
  margin-left: auto;
}

.transport-controls {
  display: grid;
  grid-template-columns: 28px 28px 40px 28px 28px;
  gap: 4px;
  align-items: center;
  flex: 0 0 auto;
}

.transport-controls button {
  width: 100%;
  min-width: 0;
}

.toolbar-separator {
  flex: 0 0 1px;
  width: 1px;
  height: 24px;
  background: var(--line);
}

.playback-progress {
  display: grid;
  grid-template-columns: auto minmax(110px, 1fr) 26px;
  gap: 10px;
  align-items: center;
  flex: 1 1 190px;
  min-width: 170px;
}

.step-readout {
  display: inline-flex;
  gap: 5px;
  align-items: baseline;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.step-readout strong {
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  text-transform: none;
  white-space: nowrap;
}

.playback button {
  min-width: 28px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  transition:
    transform 150ms ease,
    color 150ms ease,
    border-color 150ms ease,
    background 150ms ease;
}

.playback button:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  background: var(--mist);
}

.playback button:active:not(:disabled) {
  transform: translateY(0);
}

.playback button:disabled {
  cursor: default;
  opacity: 0.3;
}

.transport-button {
  display: grid;
  padding: 0;
  place-items: center;
  color: var(--ink-soft);
}

.transport-button svg {
  width: 16px;
  height: 16px;
  overflow: visible;
}

.transport-button path {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.35;
}

.playback .play-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  padding: 0;
  color: white;
  border-color: var(--ink);
  background: var(--ink);
  font-size: 12px;
  font-weight: 750;
}

.playback .play-button:hover:not(:disabled) {
  border-color: var(--ink-soft);
  background: var(--ink-soft);
}

.play-icon {
  display: grid;
  width: 14px;
  height: 14px;
  place-items: center;
  color: white;
}

.play-icon svg {
  grid-area: 1 / 1;
  width: 14px;
  height: 14px;
}

.play-icon .icon-play path {
  fill: currentColor;
}

.play-icon .icon-play {
  transform: translateX(0.5px);
}

.play-icon .icon-pause {
  display: none;
}

.play-icon .icon-pause rect {
  fill: currentColor;
}

.play-button.is-playing .icon-play {
  display: none;
}

.play-button.is-playing .icon-pause {
  display: block;
}

.playback .speed-button {
  --speed-angle: -18deg;
  display: inline-flex;
  gap: 6px;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-width: 56px;
  padding: 0 6px;
  color: var(--ink-soft);
  border-color: transparent;
  background: transparent;
}

.playback .speed-button:hover:not(:disabled) {
  color: var(--blue-deep);
  border-color: transparent;
  background: var(--mist);
}

.speed-gauge {
  width: 21px;
  height: 14px;
  overflow: visible;
}

.speed-gauge path,
.speed-gauge line {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.6;
}

.speed-gauge circle {
  fill: currentColor;
}

.speed-needle {
  transform: rotate(var(--speed-angle));
  transform-origin: 12px 13px;
  transform-box: view-box;
  transition: transform 220ms cubic-bezier(0.22, 0.7, 0.2, 1);
}

#speed-value {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  height: 2px;
  border-radius: 10px;
  background: linear-gradient(
    90deg,
    var(--blue) 0,
    var(--blue) var(--range-progress, 0%),
    var(--line) var(--range-progress, 0%),
    var(--line) 100%
  );
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  width: 12px;
  height: 12px;
  border: 2px solid white;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 1px var(--blue), 0 3px 8px rgba(8, 120, 255, 0.28);
  appearance: none;
}

input[type="range"]::-moz-range-thumb {
  width: 8px;
  height: 8px;
  border: 2px solid white;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 1px var(--blue), 0 3px 8px rgba(8, 120, 255, 0.28);
}