.chain-body {
  overflow: hidden;
  background: var(--app-bg);
}

.chain-body.is-export-modal-open {
  overflow: hidden;
}

.chain-app {
  display: grid;
  grid-template-columns: 380px minmax(0, 1fr);
  min-height: 100vh;
}

.chain-workspace {
  grid-column: 2;
  min-width: 0;
  padding: 18px;
}

.chain-canvas-shell {
  position: relative;
  width: 100%;
  height: calc(100vh - 36px);
  min-height: 420px;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  overflow: hidden;
}

.chain-graph-summary {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 3;
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.45;
  pointer-events: none;
}

.chain-graph-summary span {
  display: block;
}

.chain-canvas-actions {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 4;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
}

.chain-canvas-actions__row {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  justify-content: flex-end;
}

.chain-rapid-edge {
  position: absolute;
  right: 12px;
  bottom: 12px;
  z-index: 4;
  width: 116px;
  height: 34px;
  border: 1px solid var(--border-1);
  border-radius: 999px;
  background: var(--surface-1);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0);
  overflow: hidden;
  transition:
    width var(--transition-base),
    height var(--transition-base),
    border-radius var(--transition-base),
    box-shadow var(--transition-base);
}

.chain-matrix-button {
  position: absolute;
  right: 12px;
  bottom: 54px;
  z-index: 4;
  transition:
    bottom var(--transition-base),
    transform var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.chain-analysis-button {
  position: absolute;
  right: 12px;
  bottom: 96px;
  z-index: 4;
  display: grid;
  place-items: center;
  width: 42px;
  padding: 0;
  transition:
    bottom var(--transition-base),
    transform var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    color var(--transition-fast),
    opacity var(--transition-fast);
}

.chain-analysis-button img {
  display: block;
  width: 18px;
  height: 18px;
}

[data-theme="dark"] .chain-analysis-button img {
  filter: invert(1);
}

.chain-analysis-button[data-probabilities-invalid="true"] {
  color: var(--text-3);
  opacity: 0.48;
}

.chain-analysis-button.is-probability-nudge {
  border-color: var(--color-error);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-error) 24%, transparent);
  animation: chain-analysis-button-nudge 300ms ease-in-out;
}

.chain-theme-button {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 4;
  display: grid;
  place-items: center;
  width: 42px;
  height: 34px;
  min-height: 0;
  padding: 0;
  border: 1px solid var(--border-1);
  border-radius: 999px;
  background: var(--surface-1);
  color: var(--text-1);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0);
  transition:
    bottom var(--transition-base),
    transform var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.chain-theme-button:hover,
.chain-theme-button:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border-1));
  background: var(--surface-1);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0.12);
}

.chain-theme-button img {
  display: block;
  width: 18px;
  height: 18px;
}

[data-theme="dark"] .chain-theme-button img {
  filter: invert(1);
}

.chain-canvas-shell:has(.chain-rapid-edge.is-open) .chain-matrix-button {
  bottom: 182px;
}

.chain-canvas-shell:has(.chain-rapid-edge.is-open) .chain-analysis-button {
  bottom: 224px;
}

@keyframes chain-analysis-button-nudge {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.chain-rapid-edge.is-open {
  width: 164px;
  height: 158px;
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0.12);
}

.chain-rapid-edge > [data-rapid-edge-open] {
  position: absolute;
  inset: 0;
  width: 100%;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: inherit;
  background: transparent;
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.chain-rapid-edge.is-open > [data-rapid-edge-open] {
  pointer-events: none;
  opacity: 0;
}

.chain-rapid-edge__panel {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 7px;
  padding: 18px 14px 12px;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.88);
  transform-origin: right bottom;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-base);
}

.chain-rapid-edge.is-open .chain-rapid-edge__panel {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.chain-rapid-edge__close {
  position: absolute;
  top: 3px;
  right: 5px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-3);
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.chain-rapid-edge__close:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-rapid-edge__source {
  display: grid;
  align-items: center;
  justify-items: center;
  align-content: center;
  gap: 12px;
  color: var(--text-2);
  font-size: 0.9rem;
}

.chain-rapid-edge__node {
  display: inline-grid;
  place-items: center;
  width: 68px;
  height: 68px;
  padding: 4px;
  border: 2px solid var(--text-1);
  border-radius: 50%;
  background: var(--surface-1);
  color: var(--text-1);
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1;
  overflow: hidden;
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.chain-rapid-edge__node.is-replacing {
  border-color: var(--color-error);
  color: var(--color-error);
  background: var(--status-error-soft);
}

.chain-rapid-edge__node.is-waiting {
  animation: chain-rapid-edge-waiting 1s steps(1, end) infinite;
}

@keyframes chain-rapid-edge-waiting {
  50% {
    color: transparent;
  }
}

.chain-rapid-edge__node:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-rapid-edge__message {
  min-height: 1em;
  margin: 0;
  font-size: 0.78rem;
  text-align: center;
}

.chain-rapid-edge__message:empty {
  display: none;
}

.chain-clear-button {
  width: auto;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--border-1);
  border-radius: 999px;
  background: var(--surface-1);
  color: var(--text-2);
  font: inherit;
  line-height: 1;
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.chain-clear-button:hover,
.chain-clear-button:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border-1));
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0.12);
  outline: none;
}

.chain-grid-toggle {
  display: inline-grid;
  place-items: center;
  min-width: 42px;
  padding: 0 11px;
}

.chain-grid-toggle img {
  display: block;
  width: 18px;
  height: 18px;
  transform: translate(-1px, -1px);
}

.chain-grid-toggle[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.chain-settings-anchor {
  position: relative;
  flex: 0 0 42px;
  width: 42px;
  height: 34px;
  z-index: 5;
}

.chain-settings {
  position: absolute;
  top: 0;
  right: 0;
  width: 42px;
  height: 34px;
  min-width: 42px;
  max-width: 42px;
  border: 1px solid var(--border-1);
  border-radius: 999px;
  background: var(--surface-1);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0);
  overflow: hidden;
  transition:
    width var(--transition-base),
    height var(--transition-base),
    min-width var(--transition-base),
    max-width var(--transition-base),
    border-radius var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.chain-settings.is-open {
  width: 286px;
  height: 102px;
  min-width: 286px;
  max-width: 286px;
  border-radius: calc(var(--radius-sm) + 2px);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0.12);
}

.chain-settings:not(.is-open):not(.is-closing):has(.chain-settings__open:hover),
.chain-settings:not(.is-open):not(.is-closing):has(.chain-settings__open:focus-visible),
.chain-colors:not(.is-open):not(.is-closing):has(.chain-colors__open:hover),
.chain-colors:not(.is-open):not(.is-closing):has(.chain-colors__open:focus-visible) {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border-1));
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0.12);
}

.chain-settings__open:focus-visible,
.chain-colors__open:focus-visible {
  outline: none;
}

.chain-settings.is-closing {
  pointer-events: none;
}

.chain-settings__open {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 42px;
  height: 34px;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.chain-settings__open img {
  display: block;
  width: 18px;
  height: 18px;
  transform: translate(1px, -1px);
}

[data-theme="dark"] .chain-settings__open img {
  filter: invert(1);
}

.chain-settings.is-open .chain-settings__open,
.chain-settings.is-closing .chain-settings__open {
  pointer-events: none;
  opacity: 0;
}

.chain-settings__panel {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: start;
  gap: 15px;
  padding: 21px 16px 14px;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.88);
  transform-origin: right top;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-base);
}

.chain-settings.is-open .chain-settings__panel {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.chain-settings__close {
  position: absolute;
  top: 3px;
  right: 5px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-3);
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.chain-settings__close:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-settings__title {
  margin: 0;
  color: var(--text-1);
  font-family: var(--font-display);
  font-size: 1rem;
}

.chain-colors-anchor {
  position: relative;
  flex: 0 0 42px;
  width: 42px;
  height: 34px;
  z-index: 5;
}

.chain-colors {
  position: absolute;
  top: 0;
  right: 0;
  width: 42px;
  height: 34px;
  min-width: 42px;
  max-width: 42px;
  border: 1px solid var(--border-1);
  border-radius: 999px;
  background: var(--surface-1);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0);
  overflow: hidden;
  transition:
    width var(--transition-base),
    height var(--transition-base),
    min-width var(--transition-base),
    max-width var(--transition-base),
    border-radius var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.chain-colors.is-open {
  width: 286px;
  height: 224px;
  min-width: 286px;
  max-width: 286px;
  border-radius: calc(var(--radius-sm) + 2px);
  box-shadow: 0 10px 24px rgba(15, 18, 24, 0.12);
}

.chain-colors.is-closing {
  pointer-events: none;
}

.chain-colors__open {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 42px;
  height: 34px;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.chain-colors__open img {
  display: block;
  width: 18px;
  height: 18px;
  transform: translateX(1px);
}

[data-theme="dark"] .chain-colors__open img {
  filter: brightness(0) invert(1);
}

.chain-colors.is-open .chain-colors__open,
.chain-colors.is-closing .chain-colors__open {
  pointer-events: none;
  opacity: 0;
}

.chain-colors__panel {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 21px 16px 14px;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.88);
  transform-origin: right top;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-base);
}

.chain-colors.is-open .chain-colors__panel {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.chain-colors__close {
  position: absolute;
  top: 3px;
  right: 5px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-3);
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.chain-colors__close:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-colors__title {
  margin: 0;
  color: var(--text-1);
  font-family: var(--font-display);
  font-size: 1rem;
}

.chain-colors-field {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 18px;
  align-items: baseline;
  gap: 8px;
  color: var(--text-2);
  font-size: 0.95rem;
  font-weight: 700;
}

.chain-colors-field__swatch {
  width: 16px;
  height: 16px;
  align-self: center;
  border: 1px solid var(--border-2);
  border-radius: 50%;
  background: transparent;
}

.chain-colors-field__value {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: 3px;
}

.chain-colors-field__value .chain-input {
  min-height: 24px;
  padding: 0 0 1px;
  border-width: 0 0 1px;
  border-radius: 0;
  background: transparent;
  line-height: 1.1;
}

.chain-colors-field__value .chain-input:focus-visible {
  outline: none;
  border-color: var(--color-error);
}

.chain-colors__message {
  min-height: 1em;
  margin: 0;
  font-size: 0.78rem;
}

.chain-colors__reset {
  justify-self: start;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-2);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}

.chain-colors__reset:hover,
.chain-colors__reset:focus-visible {
  color: var(--accent);
  outline: none;
}

.chain-colors__message:empty {
  display: none;
}

.chain-colors.is-open:has(.chain-colors__message:not(:empty)) {
  height: 246px;
}

.chain-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}

.chain-canvas.is-connecting {
  cursor: copy;
}

.chain-canvas.is-placeable {
  cursor: crosshair;
}

.chain-canvas.is-panning {
  cursor: grabbing;
}

.chain-canvas.is-moving-node {
  cursor: crosshair;
}

.chain-grid-line {
  stroke: color-mix(in srgb, var(--border-1) 78%, transparent);
  stroke-width: 0.018;
}

.chain-axis-line {
  stroke: color-mix(in srgb, var(--text-3) 42%, transparent);
  stroke-width: 0.026;
}

.chain-polar-grid-circle,
.chain-polar-grid-ray {
  fill: none;
  stroke: color-mix(in srgb, var(--border-1) 78%, transparent);
  stroke-width: 0.018;
}

.chain-polar-grid-circle--major,
.chain-polar-grid-ray--major {
  stroke: color-mix(in srgb, var(--text-3) 42%, transparent);
  stroke-width: 0.026;
}

.chain-edge {
  fill: none;
  stroke: var(--chain-edge-color, var(--chain-graph-color, #000000));
  stroke-width: 0.055;
  stroke-linecap: round;
  stroke-linejoin: round;
  cursor: pointer;
}

.chain-edges-layer .is-checker-highlighted--bad .chain-edge {
  stroke: var(--color-error);
}

.chain-edges-layer .is-checker-highlighted--bad .chain-edge-label {
  fill: var(--color-error);
}

.chain-edges-layer .is-checker-highlighted--good .chain-edge {
  stroke: var(--color-success);
}

.chain-edges-layer .is-checker-highlighted--good .chain-edge-label {
  fill: var(--color-success);
}

.chain-edges-layer .is-selected-node-edge:not(.is-checker-highlighted) .chain-edge {
  stroke: var(--color-error);
}

.chain-edges-layer .is-selected-node-edge:not(.is-checker-highlighted) .chain-edge-label {
  fill: var(--color-error);
}

.chain-edge-gap {
  fill: none;
  stroke: var(--chain-bg-color, #ffffff);
  stroke-width: 0.24;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}

.chain-edge-label {
  fill: var(--chain-text-color, var(--chain-graph-color, #000000));
  font-family: var(--font-mono);
  font-size: 0.22px;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
}

.chain-edge-label-backdrop {
  fill: var(--chain-bg-color, #ffffff);
  pointer-events: none;
}

.chain-undirected-edge-labels {
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.chain-undirected-edge:hover .chain-undirected-edge-labels,
.chain-undirected-edge:focus-within .chain-undirected-edge-labels {
  opacity: 1;
}

.chain-canvas.is-probabilities-hidden .chain-edge-label,
.chain-canvas.is-probabilities-hidden .chain-edge-label-backdrop,
.chain-canvas.is-probabilities-hidden .chain-edge-gap {
  display: none;
}

.chain-node {
  cursor: pointer;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

.chain-node:focus,
.chain-node:active,
.chain-node:focus-visible {
  outline: none;
}

.chain-node circle {
  fill: var(--chain-node-fill-color, var(--surface-1));
  stroke: var(--chain-node-color, var(--chain-graph-color, #000000));
  stroke-width: 0.055;
}

.chain-node.is-selected circle {
  fill: color-mix(in srgb, var(--accent) 10%, var(--surface-1));
  stroke: var(--accent);
}

.chain-node.is-pending circle {
  stroke: var(--color-info);
}

.chain-node.is-moving {
  cursor: grab;
}

.chain-node.is-moving circle {
  fill: color-mix(in srgb, var(--color-error) 12%, var(--surface-1));
  stroke: var(--color-error);
}

.chain-node.is-moving text {
  fill: var(--color-error);
}

.chain-node.is-checker-highlighted--bad circle {
  fill: color-mix(in srgb, var(--color-error) 10%, var(--surface-1));
  stroke: var(--color-error);
}

.chain-node.is-checker-highlighted--bad text {
  fill: var(--color-error);
}

.chain-node.is-checker-highlighted--good circle {
  fill: color-mix(in srgb, var(--color-success) 10%, var(--surface-1));
  stroke: var(--color-success);
}

.chain-node.is-checker-highlighted--good text {
  fill: var(--color-success);
}

.chain-canvas.is-moving-node .chain-node.is-moving:active {
  cursor: grabbing;
}

.chain-node text {
  fill: var(--chain-text-color, var(--chain-graph-color, #000000));
  font-family: var(--font-display);
  font-size: 0.27px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
}

.chain-panel {
  grid-column: 1;
  grid-row: 1;
  display: grid;
  align-content: start;
  gap: 20px;
  height: 100vh;
  padding: 24px;
  border-right: 1px solid var(--border-1);
  background: var(--surface-1);
  overflow: auto;
}

.chain-panel__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.chain-return-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  width: fit-content;
  max-width: 100%;
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.chain-return-link:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 6px;
}

.chain-return-link__arrow {
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  background: currentColor;
  -webkit-mask-image: url("/assets/arrow.svg");
  mask-image: url("/assets/arrow.svg");
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-size: contain;
  transform: rotate(180deg);
  transition: transform 220ms ease;
}

.chain-return-link:hover .chain-return-link__arrow,
.chain-return-link:focus-visible .chain-return-link__arrow {
  transform: rotate(180deg) translateX(3px);
}

.chain-title {
  margin: 3px 0 0;
  font-family: var(--font-display);
  font-size: 1.75rem;
  line-height: 1.05;
}

.chain-icon-button {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.chain-panel__header .chain-icon-button {
  margin-top: -9px;
}

.chain-control-group {
  display: grid;
  gap: 10px;
  padding-top: 18px;
  border-top: 1px solid var(--border-1);
}

.chain-control-group--text {
  gap: 12px;
}

.chain-display-options {
  gap: 7px;
}

.chain-display-option-row {
  display: flex;
  align-items: baseline;
  gap: 5px;
  color: var(--text-2);
  font-size: 0.9rem;
}

.chain-display-option-row > span:first-child {
  color: var(--text-3);
  font-size: 1rem;
}

.chain-display-option-row button {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: 400;
  cursor: pointer;
}

.chain-display-option-row button[aria-pressed="true"] {
  font-weight: 700;
}

.chain-display-option-row button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-label,
.chain-field span {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chain-input,
.chain-textarea {
  width: 100%;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text-1);
}

.chain-input {
  min-height: 42px;
  padding: 0 11px;
}

.chain-input--number {
  width: 86px;
}

.chain-library-name-input {
  min-height: 24px;
  padding: 0 0 1px;
  border-width: 0 0 1px;
  border-radius: 0;
  background: transparent;
  line-height: 1.1;
}

.chain-library-name-input:focus-visible {
  outline: none;
  border-color: var(--color-error);
}

.chain-library-name-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
}

.chain-textarea {
  min-height: 0;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.55;
  resize: vertical;
}

.chain-input:focus-visible,
.chain-textarea:focus-visible,
.chain-icon-button:focus-visible,
.chain-clear-button:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.chain-library-controls[hidden] {
  display: none;
}

.chain-library-controls {
  padding-top: 0;
  border-top: 0;
}

.chain-library-controls .chain-button-row {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-1);
}

.chain-library-controls .chain-message:empty {
  display: none;
}

.chain-library-overwrite {
  justify-self: start;
  padding: 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--color-error);
  font: inherit;
  cursor: pointer;
}

.chain-library-overwrite[hidden] {
  display: none;
}

.chain-library-overwrite:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.chain-library-modal {
  width: min(820px, calc(100vw - 36px));
  max-width: min(820px, calc(100vw - 36px));
  max-height: min(760px, calc(100vh - 36px));
  grid-template-rows: auto auto minmax(0, 1fr);
  overflow: auto;
}

.chain-library-modal__toolbar {
  position: sticky;
  top: -22px;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(150px, 190px) auto;
  align-items: end;
  gap: 14px;
  margin: 0;
  padding: 14px 0 18px;
  background: var(--surface-1);
}

.chain-library-modal__search {
  width: 100%;
  min-width: 0;
}

.chain-library-modal__count {
  margin: 0;
  color: var(--text-3);
  font-weight: 700;
  white-space: nowrap;
}

.chain-library-modal__search input,
.chain-library-modal__sort .chain-input {
  width: 100%;
  min-width: 0;
  min-height: 32px;
  padding: 0 0 4px;
  border-width: 0 0 1px;
  border-radius: 0;
  background: transparent;
}

.chain-library-modal__search input:focus-visible,
.chain-library-modal__sort .chain-input:focus-visible {
  outline: none;
  border-color: var(--accent);
}

.chain-library-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
  min-height: 0;
}

.chain-library-empty {
  margin: 0;
  color: var(--text-3);
}

.chain-library-card {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 12px;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  background: var(--surface-1);
}

.chain-library-card__preview {
  display: grid;
  place-items: center;
  height: 150px;
  border: 1px solid var(--border-1);
  background: transparent;
  overflow: hidden;
}

.chain-library-card__preview .markov-chain-embed {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 6px;
  border: 0;
  background: transparent;
}

.chain-library-card__preview .markov-chain-svg {
  width: 100%;
  height: 100%;
}

.chain-library-card__preview .markov-chain-svg__edge-label-backdrop {
  fill: var(--surface-1);
}

.chain-library-card__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
}

.chain-library-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.chain-library-card__actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.chain-library-card__action {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}

.chain-library-card__action:hover,
.chain-library-card__action:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border-1));
  box-shadow: 0 8px 18px rgba(15, 18, 24, 0.11);
  outline: none;
}

.chain-library-card__action img {
  width: 15px;
  height: 15px;
}

[data-theme="dark"] .chain-library-card__action img {
  filter: invert(1);
}

.chain-status {
  display: grid;
  gap: 8px;
}

.chain-status__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.chain-status__display {
  flex: 0 0 auto;
}

.chain-status__items {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px 12px;
}

.chain-status__heading {
  margin: 0 0 2px;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chain-status__heading.is-analysis-nudge {
  color: var(--color-error);
  animation: chain-analysis-heading-blink var(--analysis-nudge-blink-cycle, 1500ms) steps(1, end) var(--analysis-nudge-delay, 0ms) var(--analysis-nudge-iterations, 2) both;
}

@keyframes chain-analysis-heading-blink {
  0%, 49.999% { color: var(--color-error); }
  50%, 100% { color: var(--text-3); }
}

.chain-status__line {
  display: flex;
  grid-column: span 2;
  justify-content: center;
  gap: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-2);
  font: inherit;
  font-size: 0.9rem;
}

button.chain-status__line {
  cursor: pointer;
}

button.chain-status__line:hover,
button.chain-status__line:focus-visible {
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

button.chain-status__line:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-status__line span {
  font-weight: 700;
}

.chain-status__items--remainder-1 .chain-status__line:last-child {
  grid-column: 3 / span 2;
}

.chain-status__items--remainder-2 .chain-status__line:nth-last-child(2) {
  grid-column: 2 / span 2;
}

.chain-status__items--remainder-2 .chain-status__line:last-child {
  grid-column: 4 / span 2;
}

.chain-status__line[data-state="good"] {
  color: var(--color-success);
}

.chain-status__line[data-state="bad"] {
  color: var(--color-error);
}

.chain-status__line[data-state="bad"].is-analysis-underline-nudge {
  text-decoration-line: underline;
  text-decoration-color: var(--color-error);
  text-decoration-thickness: 0.12em;
  text-underline-offset: 0.2em;
  animation: chain-analysis-underline-fade var(--analysis-nudge-duration, 3000ms) linear var(--analysis-nudge-delay, 0ms) both;
}

@keyframes chain-analysis-underline-fade {
  from { text-decoration-color: var(--color-error); }
  to { text-decoration-color: transparent; }
}

.chain-status__batch {
  justify-self: center;
  width: fit-content;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-error);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}

.chain-status__actions {
  display: grid;
  justify-items: center;
  gap: 8px;
}

.chain-status__batch[data-state="good"] {
  color: var(--color-success);
}

.chain-status__batch[data-state="bad"] {
  color: var(--color-error);
}

.chain-status__batch:hover,
.chain-status__batch:focus-visible {
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.chain-status__batch:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-checker-fix-modal {
  gap: 18px;
}

.chain-checker-fix-modal__row {
  min-width: 0;
  overflow: auto;
  padding: 14px;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
}

.chain-checker-fix-modal__row .katex-display {
  margin: 0;
}

.chain-checker-fix-modal__actions {
  display: grid;
  gap: 10px;
}

.chain-checker-fix-modal__actions .button {
  justify-content: center;
}

.chain-checker-batch-modal {
  gap: 18px;
}

.chain-checker-batch-modal__body {
  display: grid;
  gap: 8px;
}

.chain-checker-batch-modal__label {
  margin: 0;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chain-checker-batch-modal__nodes {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  color: var(--color-error);
  font-weight: 700;
}

.chain-zero-edge-modal__edges {
  flex-direction: column;
}

.chain-checker-fix-modal__actions .button[aria-pressed="true"] {
  border-color: var(--color-error);
  color: var(--color-error);
}

.chain-node-menu {
  position: absolute;
  z-index: 5;
  width: 260px;
  max-height: calc(100% - 20px);
  padding: 12px;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  box-shadow: var(--shadow-overlay);
  overflow: auto;
}

.chain-node-menu__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
}

.chain-node-menu__body {
  display: grid;
  gap: 10px;
}

.chain-node-menu .chain-input {
  min-height: 34px;
  padding: 0 0 1px;
  border-width: 0 0 1px;
  border-radius: 0;
  background: transparent;
  line-height: 1.1;
}

.chain-node-menu .chain-input:focus-visible {
  outline: none;
  border-color: var(--color-error);
}

.chain-field {
  display: grid;
  gap: 5px;
}

.chain-check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-2);
  font-size: 0.9rem;
}

.chain-check input {
  accent-color: var(--accent);
}

.chain-edge-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 68px auto;
  align-items: center;
  gap: 10px 8px;
  margin-block: 3px;
}

.chain-edge-row .chain-input {
  min-height: 24px;
  padding-bottom: 0;
  line-height: 1;
}

.chain-edge-row span {
  min-width: 0;
  overflow: hidden;
  color: var(--text-2);
  font-size: 0.9rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chain-edge-row__delete {
  appearance: none;
  -webkit-appearance: none;
  width: auto;
  height: auto;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text-1);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  line-height: 1;
}

.chain-edge-row__delete:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.chain-export-modal p.chain-label {
  margin: 0;
}

.chain-export-preview {
  box-sizing: border-box;
  display: grid;
  place-items: center;
  min-width: 0;
  width: 100%;
  max-height: 24dvh;
  aspect-ratio: 16 / 7;
  padding: 6px;
  border: 1px solid var(--border-1);
  background: var(--surface-1);
  overflow: hidden;
}

.chain-export-preview svg {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: 100%;
  height: 100%;
}

.modal-backdrop[data-export-modal] {
  place-items: start center;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.chain-export-modal {
  margin-block: auto;
}

.chain-settings-field {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

.chain-settings-field__label {
  color: var(--text-2);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  white-space: nowrap;
}

.chain-settings-field__input {
  width: 34px;
  min-height: 34px;
  padding: 0 0 1px;
  border-width: 0 0 1px;
  border-radius: 0;
  background: transparent;
  line-height: 1.1;
  text-align: center;
}

.chain-settings-field__input:focus-visible {
  outline: none;
  border-color: var(--color-error);
}

.chain-settings-formula {
  color: var(--text-3);
  font-size: 0.95rem;
  line-height: 1.2;
  min-width: max-content;
}

.chain-settings-formula .katex {
  color: inherit;
  font-size: 1em;
}

.modal-backdrop[data-matrix-modal] {
  place-items: center;
  padding: 18px;
  overflow: auto;
  overscroll-behavior: contain;
}

.chain-matrix-modal {
  position: relative;
  width: max-content;
  max-width: none;
  max-height: none;
  overflow: visible;
}

.chain-matrix-modal .modal__header {
  padding-right: 50px;
}

.chain-matrix-modal .modal__close {
  position: absolute;
  top: 13px;
  right: 22px;
}

.chain-matrix-display-options {
  padding: 0 20px 14px;
}

.chain-matrix-modal__content {
  max-width: calc(100vw - 84px);
  max-height: calc(100vh - 130px);
  padding: 20px;
  border: 1px solid var(--border-1);
  background: var(--surface-1);
  overflow: auto;
}

.chain-matrix-modal__content .katex-display {
  margin: 0;
}

.chain-matrix-modal__content .katex {
  color: var(--text-1);
  font-size: 1.1em;
}

.chain-matrix-modal.is-small-matrix {
  min-width: min(720px, calc(100vw - 36px));
  min-height: min(520px, calc(100vh - 36px));
}

.chain-matrix-modal.is-small-matrix .chain-matrix-modal__content {
  display: grid;
  place-items: center;
  min-height: 380px;
}

.chain-matrix-modal.is-small-matrix .chain-matrix-modal__content .katex {
  font-size: 1.65em;
}

.chain-analysis-modal__content {
  display: grid;
  gap: 18px;
}

.chain-analysis-modal__section {
  display: grid;
  gap: 8px;
}

.chain-analysis-modal__heading,
.chain-analysis-modal__line,
.chain-analysis-modal__message {
  margin: 0;
}

.chain-analysis-modal__heading {
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chain-analysis-modal__line,
.chain-analysis-modal__message {
  color: var(--text-2);
  line-height: 1.5;
}

.chain-analysis-modal__distribution {
  margin: 4px 0 0;
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 1rem;
}

@media (prefers-reduced-motion: reduce) {
  .chain-analysis-button.is-probability-nudge {
    animation: none;
  }

  .chain-status__heading.is-analysis-nudge,
  .chain-status__line[data-state="bad"].is-analysis-underline-nudge {
    animation: none;
  }
}

.chain-export-disclosure {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 34px;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--border-1);
  background: transparent;
  color: var(--text-1);
  font: inherit;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.chain-export-disclosure:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.chain-export-disclosure__chevron {
  width: 12px;
  height: 12px;
  background: currentColor;
  -webkit-mask: url("/assets/chevron.svg") center / contain no-repeat;
  mask: url("/assets/chevron.svg") center / contain no-repeat;
  transition: transform var(--transition-fast);
}

.chain-export-disclosure[aria-expanded="true"] .chain-export-disclosure__chevron {
  transform: rotate(180deg);
}

.chain-export-options {
  display: grid;
  gap: 12px;
}

.chain-export-modal .chain-control-group {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.chain-export-modal .chain-input {
  min-height: 34px;
  padding: 0 0 2px;
  border-width: 0 0 1px;
  border-color: var(--field-underline-color, var(--border-2));
  border-radius: 0;
  background: transparent;
  line-height: 1.1;
}

.chain-export-modal .chain-input:focus-visible {
  outline: none;
  border-color: var(--field-underline-focus-color, var(--color-error));
}

.chain-export-modal select.chain-input {
  padding-right: 24px;
}

.chain-export-color-field {
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
}

.chain-export-color-field > .chain-export-color-label {
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: 1.08rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  white-space: nowrap;
}

.chain-export-hex-field {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  border-bottom: 1px solid var(--field-underline-color, var(--border-2));
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 1.42rem;
}

.chain-export-hex-field:focus-within {
  border-color: var(--field-underline-focus-color, var(--color-error));
}

.chain-export-hex-field > .chain-export-hex-prefix {
  padding-bottom: 2px;
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.1;
  text-transform: none;
}

.chain-export-hex-field > .chain-input.chain-input--hex {
  min-height: 0;
  padding-bottom: 2px;
  border: 0;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.1;
}

.chain-export-color-swatch {
  width: 18px;
  height: 18px;
  align-self: center;
  border: 1px solid var(--border-2);
  background: transparent;
}

.chain-input--hex {
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.chain-message {
  min-height: 1.25em;
  margin: 0;
  color: var(--text-3);
  font-size: 0.86rem;
  line-height: 1.45;
}

.chain-message[data-state="error"] {
  color: var(--color-error);
}

.chain-message[data-state="success"] {
  color: var(--color-success);
}

.chain-export-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

@media (max-width: 900px) {
  .chain-body {
    overflow: auto;
  }

  .chain-app {
    grid-template-columns: 1fr;
  }

  .chain-workspace {
    grid-column: 1;
    padding: 12px;
  }

  .chain-canvas-shell {
    height: 58vh;
    min-height: 360px;
  }

  .chain-panel {
    grid-column: 1;
    grid-row: auto;
    height: auto;
    border-top: 1px solid var(--border-1);
    border-left: 0;
    border-right: 0;
  }
}