.pf-board {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 18px;
}

@media (max-width: 720px) {
  .pf-board { grid-template-columns: 1fr; }
}

.pf-panel {
  background: var(--bg);
  border: 1px solid var(--grid);
  border-radius: 8px;
  padding: 10px 12px 12px 12px;
  display: flex;
  flex-direction: column;
}
.pf-panel.dim {
  opacity: 0.35;
  filter: saturate(0.4);
}

.pf-panel .head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 4px;
}
.pf-panel .name {
  font-weight: 700; color: var(--title); font-size: 14px;
}
.pf-panel .complexity {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10px; color: var(--muted);
}
.pf-panel .stats {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; color: var(--text);
  margin-top: 1px;
}
.pf-panel .stats .ok    { color: var(--title); }
.pf-panel .stats .fail  { color: var(--accent); }
.pf-panel .stats .label { color: var(--muted); margin-right: 4px; }
.pf-panel .stats .sep   { color: var(--light); margin: 0 6px; }

.pf-panel canvas {
  width: 100%;
  height: 280px;
  display: block;
  background: var(--bg-soft);
  border-radius: 4px;
  margin-top: 6px;
  cursor: crosshair;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}
.pf-panel canvas.moving-start { cursor: grab; }
.pf-panel canvas.moving-goal  { cursor: grab; }

.pf-legend {
  display: flex; gap: 18px; flex-wrap: wrap;
  font-size: 11.5px; color: var(--muted);
  margin: 16px 0 4px 0;
}
.pf-legend .item { display: flex; align-items: center; gap: 6px; }
.pf-legend .swatch {
  display: inline-block;
  width: 12px; height: 12px; border-radius: 2px;
  border: 1px solid rgba(0,0,0,0.05);
}

/* legend swatches — match algorithm rendering */
.pf-legend .sw-wall    { background: var(--text); }
.pf-legend .sw-start   { background: var(--title); }
.pf-legend .sw-goal    { background: var(--accent); }
.pf-legend .sw-visited { background: #9EB7D6; }
.pf-legend .sw-frontier{ background: #D88080; }
.pf-legend .sw-path    { background: var(--accent); }

/* control labels for heuristic dropdown etc. */
.controls select {
  background: var(--bg);
  border: 1px solid var(--light);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 13px;
  color: var(--text);
  font-family: inherit;
}

.help {
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 6px;
}