/* №13 и №23 · Пути в графе — page styles. Colors come only from main.css tokens. */

.paths-block {
  margin-top: 18px;
}

.paths-note {
  margin: 8px 0 0;
}

.paths-command-list {
  margin: -0.5em 0 1em;
  padding-left: 1.6em;
}

.paths-toolbar {
  margin-bottom: 14px;
}

.paths-subhead {
  margin-top: 22px;
}

/* Feedback boxes are restyled by setFeedback(), which replaces className — so spacing hangs on an attribute. */
[data-feedback],
.paths-result {
  margin-top: 12px;
}

[data-feedback]:empty,
.paths-result:empty {
  display: none;
}

/* Wide drawings scroll inside their own box; the page itself never scrolls sideways. */
.paths-scroll {
  margin-top: 10px;
  padding-bottom: 6px;
  overscroll-behavior-x: contain;
}

.paths-scroll svg {
  display: block;
  max-width: none;
}

.paths-legend-row {
  gap: 8px 16px;
}

.paths-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--muted);
}

.paths-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.paths-swatch {
  width: 24px;
  border-top: 3px solid;
  border-radius: 2px;
}

.paths-swatch-add {
  border-color: var(--win2);
}

.paths-swatch-mul {
  border-color: var(--primary);
}

.paths-ask {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.paths-ask-title {
  margin: 0;
  font-weight: 650;
}

.paths-ask .answer-row + .small {
  margin: 0;
}

.paths-selects {
  align-items: end;
  gap: 12px 20px;
}

.paths-selects .select {
  min-width: 150px;
}

.paths-formula {
  font-variant-numeric: tabular-nums;
  font-weight: 650;
}

.paths-graph-actions {
  margin-top: 12px;
}

.paths-rule {
  margin: 0 0 4px;
}

.paths-order-line {
  margin: 10px 0 0;
}

.paths-actions {
  margin: 14px 0 6px;
}

/* ---------- Stage 1: calculator drawing ---------- */

.calc-svg {
  font-family: var(--font);
  user-select: none;
}

.calc-row-label {
  fill: var(--faint);
  font-size: 11px;
  font-weight: 600;
}

.calc-edge {
  fill: none;
  stroke-width: 2;
  opacity: 0.25;
  transition: opacity 0.25s, stroke-width 0.25s;
}

.calc-edge-add {
  stroke: var(--win2);
}

.calc-edge-mul {
  stroke: var(--primary);
}

.calc-marker-add {
  fill: var(--win2);
}

.calc-marker-mul {
  fill: var(--primary);
}

.calc-edge.is-lit {
  opacity: 0.85;
}

.calc-edge.is-incoming {
  opacity: 1;
  stroke-width: 3.5;
}

.calc-edge.is-dead {
  opacity: 0.1;
}

.calc-edge.is-skipped {
  opacity: 0.3;
  stroke-dasharray: 5 6;
}

.calc-edge.is-pulse {
  animation: paths-edge-pulse 0.7s ease 2;
}

.calc-node circle {
  fill: var(--surface);
  stroke: var(--border-strong);
  stroke-width: 2;
  transition: fill 0.2s, stroke 0.2s;
}

.calc-node text {
  fill: var(--text);
  font-size: 14px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
}

.calc-node.is-filled circle {
  fill: var(--primary-soft);
  stroke: var(--primary);
}

.calc-node.is-current circle {
  fill: var(--warn-soft);
  stroke: var(--warn);
  stroke-width: 3;
}

.calc-node.is-via circle {
  fill: var(--win-soft);
  stroke: var(--win);
  stroke-width: 3.5;
}

.calc-node.is-avoid circle {
  fill: var(--lose-soft);
  stroke: var(--lose);
}

.calc-cross {
  stroke: var(--lose);
  stroke-width: 3;
  stroke-linecap: round;
}

.calc-count rect {
  fill: var(--surface-2);
  stroke: var(--border);
  transition: fill 0.2s, stroke 0.2s;
}

.calc-count text {
  fill: var(--text);
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
}

.calc-count.is-empty text {
  fill: var(--faint);
}

.calc-count.is-current rect {
  fill: var(--warn-soft);
  stroke: var(--warn);
}

.calc-count.is-feeding rect {
  fill: var(--info-soft);
  stroke: var(--info);
}

.calc-count.is-zero text {
  fill: var(--lose);
}

.calc-count.is-changed rect {
  stroke: var(--primary);
}

/* CSS transforms on SVG parts need their own box, otherwise pop/shake scale around the SVG origin. */
.calc-count,
.calc-node,
.graph-vertex,
.graph-value {
  transform-box: fill-box;
  transform-origin: center;
}

/* ---------- Stage 2: graph drawing ---------- */

.graph-svg {
  display: block;
  width: 100%;
  min-width: 640px;
  height: auto;
  font-family: var(--font);
  user-select: none;
}

.paths-scroll .graph-svg {
  max-width: 860px;
  margin-inline: auto;
}

.graph-edge line {
  stroke: var(--border-strong);
  stroke-width: 2;
  transition: stroke 0.2s, stroke-width 0.2s, opacity 0.2s;
}

.graph-marker {
  fill: var(--border-strong);
}

.graph-edge.is-used line {
  stroke: var(--primary);
  opacity: 0.45;
}

.graph-edge.is-incoming line {
  stroke: var(--warn);
  stroke-width: 3.5;
  opacity: 1;
}

.graph-edge.is-best line {
  stroke: var(--primary);
  stroke-width: 4;
  opacity: 1;
}

.graph-edge.is-path line {
  stroke: var(--win);
  stroke-width: 5;
  opacity: 1;
}

.graph-marker-used {
  fill: var(--primary);
}

.graph-marker-incoming {
  fill: var(--warn);
}

.graph-marker-path {
  fill: var(--win);
}

.graph-weight {
  fill: var(--muted);
  font-size: 13px;
  font-weight: 650;
  text-anchor: middle;
  dominant-baseline: central;
  paint-order: stroke;
  stroke: var(--surface);
  stroke-width: 5px;
  stroke-linejoin: round;
}

.graph-edge.is-incoming .graph-weight,
.graph-edge.is-best .graph-weight {
  fill: var(--text);
}

.graph-vertex {
  cursor: pointer;
  outline: none;
}

.graph-ring {
  fill: var(--surface);
  stroke: var(--border-strong);
  stroke-width: 2.5;
  transition: fill 0.2s, stroke 0.2s;
}

.graph-focus {
  fill: none;
  stroke: var(--primary);
  stroke-width: 4;
  opacity: 0;
}

.graph-vertex:focus-visible .graph-focus {
  opacity: 0.55;
}

.graph-vertex:hover .graph-ring {
  stroke: var(--primary);
}

.graph-id {
  fill: var(--text);
  font-size: 17px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}

.graph-vertex.is-done .graph-ring {
  fill: var(--primary-soft);
  stroke: var(--primary);
}

.graph-vertex.is-selected .graph-ring {
  fill: var(--warn-soft);
  stroke: var(--warn);
  stroke-width: 3.5;
}

.graph-vertex.is-missing .graph-ring {
  animation: paths-ring-pulse 0.75s ease 3;
}

.graph-vertex.is-path .graph-ring {
  fill: var(--win-soft);
  stroke: var(--win);
  stroke-width: 3.5;
}

.graph-value rect {
  fill: var(--surface);
  stroke: var(--primary);
  stroke-width: 1.5;
}

.graph-value text {
  fill: var(--primary);
  font-size: 13px;
  font-weight: 750;
  text-anchor: middle;
  dominant-baseline: central;
}

.graph-order-badge circle {
  fill: var(--info);
}

.graph-order-badge text {
  fill: var(--surface);
  font-size: 11px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: central;
}

/* ---------- Stage 3: file ---------- */

.paths-big-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  align-items: start;
}

@media (max-width: 820px) {
  .paths-big-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.paths-yarn {
  margin: 0;
  display: grid;
  gap: 8px;
  justify-items: center;
  text-align: center;
}

.paths-yarn-art svg {
  display: block;
  width: min(100%, 300px);
  height: auto;
}

.yarn-edge {
  stroke: var(--primary);
  stroke-width: 0.7;
  opacity: 0.32;
}

.yarn-node {
  fill: var(--primary);
}

.yarn-node.is-end {
  fill: var(--lose2);
}

/* ---------- Stage 4: exam table ---------- */

.paths-table th,
.paths-table td {
  padding: 6px 10px;
  text-align: center;
}

.paths-table th:first-child,
.paths-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  text-align: left;
  background: var(--surface-2);
  color: var(--muted);
  font-weight: 650;
}

.paths-table .is-via {
  background: var(--win-soft);
  color: var(--win);
  font-weight: 750;
}

.paths-table .is-avoid {
  background: var(--lose-soft);
  color: var(--lose);
  font-weight: 750;
}

.paths-table .is-target {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 800;
}

.paths-table-legend {
  margin: 8px 0 0;
}

/* ---------- Motion ---------- */

@keyframes paths-edge-pulse {
  50% {
    opacity: 1;
    stroke-width: 6px;
  }
}

@keyframes paths-ring-pulse {
  50% {
    stroke: var(--lose);
    stroke-width: 7px;
    fill: var(--lose-soft);
  }
}