/* Classifier tree (thesis Figure 3.2). Owned by js/tree.js.
   Uses the site tokens; the fallbacks below are the light values. */

.tree,
.tree-controls,
.tree-detail {
  --tree-ink: var(--ink, #17142B);
  --tree-ink-2: var(--ink-2, #4B4766);
  --tree-card: var(--card, #FFFFFF);
  --tree-open: var(--open, #0B6E73);
  --tree-tn5: var(--tn5, #C3313F);
  --tree-mono: "Martian Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --tree-edge: var(--tree-ink);
}
.tree {
  position: relative;
  margin: 1.5rem 0 0;
}

/* ---- no-JS fallback: nested list ------------------------------------------ */
.tree-static,
.tree-static ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.tree-static {
  font-family: var(--tree-mono);
  font-stretch: 87.5%;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--tree-ink);
}
.tree-static ul { padding-left: 1.75rem; }
.tree-static li { position: relative; padding-top: 0.4rem; }
.tree-static ul > li::before,
.tree-static ul > li::after {
  content: "";
  position: absolute;
  left: -1.1rem;
  border-color: color-mix(in srgb, var(--tree-ink) 38%, transparent);
  border-style: solid;
  border-width: 0;
}
.tree-static ul > li::before { top: 0; bottom: 0; border-left-width: 1px; }
.tree-static ul > li:last-child::before { bottom: auto; height: calc(0.4rem + 0.95em); }
.tree-static ul > li::after { top: calc(0.4rem + 0.95em); width: 0.85rem; border-top-width: 1px; }
.tree-static li > span {
  display: inline-block;
  padding: 0.3rem 0.65rem;
  border: 1px solid color-mix(in srgb, var(--tree-ink) 30%, var(--tree-card));
  border-radius: 0.5rem;
  background: var(--tree-card);
}
.tree-static li:not(:has(> ul)) > span {
  background: color-mix(in srgb, var(--tree-open) 11%, var(--tree-card));
  border-color: color-mix(in srgb, var(--tree-open) 55%, var(--tree-card));
}
.tree-static li.is-group > span {
  background: var(--tree-card);
  border: 1.5px dashed color-mix(in srgb, var(--tree-ink) 60%, var(--tree-card));
}
.tree.is-mounted .tree-static { display: none; }

/* Controls only make sense once the script has mounted the tree. */
.tree:not(.is-mounted) ~ .tree-controls { display: none; }

/* ---- mounted tree ----------------------------------------------------------- */
.tree-js { position: relative; }

.tree-sr {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.tree-canvas {
  position: relative;
  width: 100%;
}
.tree-canvas ul,
.tree-canvas li {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tree-edges {
  position: absolute;
  inset: 0 auto auto 0;
  overflow: visible;
  pointer-events: none;
}
.tree-edges .tree-edge {
  fill: none;
  stroke: var(--tree-edge);
  stroke-width: 1.25;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.tree-edges .tree-arrow { fill: var(--tree-edge); stroke: none; }
/* group opacity, so overlapping trunks do not darken */
.tree-edges-base { opacity: 0.5; }
.tree-edges-path .tree-edge { stroke: var(--tree-tn5); stroke-width: 2; }
.tree-edges-path .tree-arrow { fill: var(--tree-tn5); }

.tree-cell {
  fill: var(--tree-tn5);
  stroke: var(--paper, #F3F2F7);
  stroke-width: 2;
  opacity: 0;
}
.tree-cell.is-on { opacity: 1; }

/* ---- nodes ---------------------------------------------------------------- */
.tree-node {
  position: absolute;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0 0.6rem;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-family: var(--tree-mono);
  font-stretch: 87.5%;
  font-size: 0.78rem;
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--tree-ink);
  background: var(--tree-card);
  border: 1px solid color-mix(in srgb, var(--tree-ink) 46%, var(--tree-card));
  border-radius: 0.5rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
}
[data-layout="narrow"] .tree-node { justify-content: flex-start; padding-left: 0.75rem; }
.tree-js.is-compact .tree-node { padding: 0 0.35rem; font-size: 0.7rem; letter-spacing: 0; }

.tree-node.is-root { font-weight: 600; }
.tree-node.is-leaf {
  background: color-mix(in srgb, var(--tree-open) 11%, var(--tree-card));
  border-color: color-mix(in srgb, var(--tree-open) 72%, var(--tree-card));
}
.tree-node.is-group {
  border: 1.5px dashed color-mix(in srgb, var(--tree-ink) 62%, var(--tree-card));
}

@media (hover: hover) {
  .tree-node:hover { border-color: var(--tree-ink); }
  .tree-run:hover { background: var(--tree-ink); color: var(--tree-card); }
}
.tree-node.is-path {
  border-color: var(--tree-tn5);
  box-shadow: inset 0 0 0 0.5px var(--tree-tn5);
}
.tree-node.is-active {
  background: var(--tree-ink);
  border-color: var(--tree-ink);
  border-style: solid;
  color: var(--tree-card);
}
.tree-node.is-leaf.is-active {
  background: var(--tree-open);
  border-color: var(--tree-open);
}
.tree-node.is-selected:not(.is-active):not(.is-path) {
  box-shadow: inset 0 0 0 1px var(--tree-ink);
}
.tree-node:focus { outline: none; }
.tree-node:focus-visible {
  outline: 2px solid var(--tree-tn5);
  outline-offset: 2px;
}

/* stopped early: a short red bar where the cell would have carried on */
.tree-node.is-stopped { overflow: visible; }
.tree-node.is-stopped::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -7px;
  width: 3px;
  height: 70%;
  border-radius: 2px;
  background: var(--tree-tn5);
  transform: translateY(-50%);
}
[data-layout="narrow"] .tree-node.is-stopped::after {
  top: auto;
  right: auto;
  bottom: -7px;
  left: 6px;
  width: 16px;
  height: 3px;
  transform: none;
}

/* arrival ping while a cell travels */
.tree-node.is-ping { animation: tree-ping 0.42s ease-out; }
@keyframes tree-ping {
  from { box-shadow: 0 0 0 0 color-mix(in srgb, var(--tree-tn5) 45%, transparent); }
  to { box-shadow: 0 0 0 7px color-mix(in srgb, var(--tree-tn5) 0%, transparent); }
}

/* ---- legend ---------------------------------------------------------------- */
.tree-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0;
  margin: 1rem 0 0;
  font-family: var(--tree-mono);
  font-stretch: 87.5%;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--tree-ink-2);
}
.tree-key {
  display: inline-block;
  width: 1.5rem;
  height: 0.8rem;
  border-radius: 0.25rem;
  vertical-align: middle;
}
.tree-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-right: 1rem;
  white-space: nowrap;
}
.tree-key-leaf {
  background: color-mix(in srgb, var(--tree-open) 11%, var(--tree-card));
  border: 1px solid color-mix(in srgb, var(--tree-open) 72%, var(--tree-card));
}
.tree-key-group {
  background: var(--tree-card);
  border: 1.5px dashed color-mix(in srgb, var(--tree-ink) 62%, var(--tree-card));
}

/* ---- controls, breadcrumb, detail ------------------------------------------- */
.tree-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin-top: 1.5rem;
}
.tree-run {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.75rem;
  margin: 0;
  padding: 0 1.1rem 0 0.95rem;
  font-family: var(--tree-mono);
  font-stretch: 87.5%;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--tree-ink);
  background: var(--tree-card);
  border: 1px solid var(--tree-ink);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease;
}
.tree-run::before {
  content: "";
  flex: none;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--tree-tn5);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--tree-tn5) 22%, transparent);
}
.tree-run:focus-visible { outline: 2px solid var(--tree-tn5); outline-offset: 2px; }

.tree-path {
  flex: 1 1 18rem;
  min-height: 1.5em;
  margin: 0;
  font-family: var(--tree-mono);
  font-stretch: 87.5%;
  font-size: 0.78rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--tree-ink-2);
}
.tree-path span { white-space: nowrap; }
.tree-path .is-current { color: var(--tree-ink); font-weight: 600; }

.tree-detail {
  min-height: 3.2em;
  margin: 0.9rem 0 0;
  font-family: "Newsreader", Georgia, serif;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--tree-ink);
}
.tree-detail.is-running:empty::before { content: none; }
.tree-detail:empty::before {
  content: attr(data-hint);
  color: var(--tree-ink-2);
  font-style: italic;
}
.tree-detail-name {
  margin-right: 0.35rem;
  font-family: var(--tree-mono);
  font-stretch: 87.5%;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.tree-detail.is-result::before {
  content: "";
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  margin-right: 0.55rem;
  border-radius: 50%;
  background: var(--tree-tn5);
  vertical-align: 0.05em;
}

@media (prefers-reduced-motion: reduce) {
  .tree-node,
  .tree-run { transition: none; }
  .tree-node.is-ping { animation: none; }
}