/* Brachial plexus app: 3D viewer (js/viewer3d.js). Scoped to .v3d. */
.v3d {
  --v3d-bg: var(--surface-2, #eef2f6);
  --v3d-bg-2: var(--surface, #ffffff);
  --v3d-fg: var(--text, #0f172a);
  --v3d-muted: var(--text-muted, #475569);
  --v3d-border: var(--border, #cbd5e1);
  --v3d-accent: var(--accent, #0b6bcb);
  --v3d-focus: var(--focus, #0b6bcb);
  --v3d-panel: rgba(255, 255, 255, 0.94);
  --v3d-label-bg: rgba(255, 255, 255, 0.9);
  --v3d-label-fg: #0f172a;
  --v3d-shadow: 0 1px 2px rgba(15, 23, 42, 0.12), 0 4px 14px rgba(15, 23, 42, 0.1);
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-height: 320px;
  color: var(--v3d-fg);
  font: 14px/1.4 var(--font, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .v3d {
    --v3d-bg: var(--surface-2, #111821);
    --v3d-bg-2: var(--surface, #0b1118);
    --v3d-fg: var(--text, #e5e9f0);
    --v3d-muted: var(--text-muted, #a7b1c2);
    --v3d-border: var(--border, #2b3646);
    --v3d-accent: var(--accent, #6cb4ff);
    --v3d-focus: var(--focus, #8cc4ff);
    --v3d-panel: rgba(17, 24, 33, 0.95);
    --v3d-label-bg: rgba(15, 23, 32, 0.86);
    --v3d-label-fg: #f1f5f9;
    --v3d-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 14px rgba(0, 0, 0, 0.35);
  }
}
:root[data-theme="dark"] .v3d {
  --v3d-bg: var(--surface-2, #111821);
  --v3d-bg-2: var(--surface, #0b1118);
  --v3d-fg: var(--text, #e5e9f0);
  --v3d-muted: var(--text-muted, #a7b1c2);
  --v3d-border: var(--border, #2b3646);
  --v3d-accent: var(--accent, #6cb4ff);
  --v3d-focus: var(--focus, #8cc4ff);
  --v3d-panel: rgba(17, 24, 33, 0.95);
  --v3d-label-bg: rgba(15, 23, 32, 0.86);
  --v3d-label-fg: #f1f5f9;
  --v3d-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 14px rgba(0, 0, 0, 0.35);
}

.v3d-stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 280px;
  overflow: hidden;
  border-radius: 12px;
  background: radial-gradient(120% 90% at 50% 35%, var(--v3d-bg-2), var(--v3d-bg));
  border: 1px solid var(--v3d-border);
  touch-action: none;
}
.v3d-canvas, .v3d-canvas canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.v3d-canvas canvas { outline: none; }
.v3d-canvas canvas:focus-visible { box-shadow: inset 0 0 0 3px var(--v3d-focus); border-radius: 12px; }
.v3d-labels { position: absolute; inset: 0; z-index: 1; pointer-events: none; overflow: hidden; }

/* Labels */
.v3d-label {
  font-size: 12px;
  line-height: 1.2;
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--v3d-label-bg);
  color: var(--v3d-label-fg);
  white-space: nowrap;
  user-select: none;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
  transition: opacity 0.15s;
}
.v3d-label.is-hidden { opacity: 0; visibility: hidden; }
.v3d-label--el { pointer-events: auto; cursor: pointer; font-weight: 600; border: 1px solid transparent; }
.v3d-label--el.is-dim { opacity: 0.35; }
.v3d-label--el.is-hover { border-color: var(--v3d-accent); }
.v3d-label--el.is-selected { background: var(--v3d-accent); color: #fff; border-color: transparent; }
:root[data-theme="dark"] .v3d-label--el.is-selected { color: #04121f; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .v3d-label--el.is-selected { color: #04121f; } }
.v3d-label--el[data-status="target"] { box-shadow: 0 0 0 2px #db2777; }
.v3d-label--collateral, .v3d-label--related { font-weight: 500; font-size: 11px; }
.v3d-label--level {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-left: 4px solid var(--lvl, #334155);
}
.v3d-label--struct { font-style: italic; color: var(--v3d-muted); background: transparent; box-shadow: none; text-shadow: 0 0 3px var(--v3d-bg-2), 0 0 3px var(--v3d-bg-2); }
.v3d-label--probe { font-size: 12px; font-weight: 600; background: #0f172a; color: #fff; max-width: 220px; white-space: normal; text-align: center; }
.v3d[data-labels="off"] .v3d-label--level, .v3d[data-labels="off"] .v3d-label--struct { opacity: 0; visibility: hidden; }

/* Toolbar */
.v3d-toolbar {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 3;
}
.v3d-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 40px;
  height: 40px;
  padding: 0 8px;
  border-radius: 10px;
  border: 1px solid var(--v3d-border);
  background: var(--v3d-panel);
  color: var(--v3d-fg);
  box-shadow: var(--v3d-shadow);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 600;
}
.v3d-btn:hover:not(:disabled):not([aria-pressed="true"]):not([aria-expanded="true"]) { border-color: var(--v3d-accent); color: var(--v3d-accent); }
.v3d-btn:focus-visible, .v3d-chip-x:focus-visible, .v3d-panel input:focus-visible { outline: 3px solid var(--v3d-focus); outline-offset: 2px; }
.v3d-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.v3d-btn[hidden] { display: none; }
.v3d-btn[aria-pressed="true"], .v3d-btn[aria-expanded="true"] { background: var(--v3d-accent); color: #fff; border-color: transparent; }
.v3d-btn.is-playing svg { animation: v3d-pulse 1s ease-in-out infinite; }
.v3d-btn--sm { min-width: 32px; height: 32px; box-shadow: none; }
.v3d-btn-text { font-size: 11px; }
@keyframes v3d-pulse { 50% { opacity: 0.4; } }

/* Legend, chip, caption, toast */
.v3d-legend {
  position: absolute;
  left: 8px;
  top: 8px;
  z-index: 2;
  max-width: calc(100% - 72px);
  padding: 6px 8px;
  border-radius: 10px;
  background: var(--v3d-panel);
  box-shadow: var(--v3d-shadow);
  font-size: 12px;
  pointer-events: none;
}
.v3d-legend-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 10px; }
.v3d-legend-list li { display: inline-flex; align-items: center; gap: 5px; }
.v3d-swatch { width: 12px; height: 12px; border-radius: 3px; flex: none; box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.2); }

.v3d-chip {
  position: absolute;
  left: 8px;
  bottom: 8px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: calc(100% - 16px);
  padding: 4px 4px 4px 10px;
  border-radius: 999px;
  background: var(--v3d-panel);
  box-shadow: var(--v3d-shadow);
  font-weight: 600;
}
.v3d-chip[hidden] { display: none; }
.v3d-chip-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.v3d-chip-status { display: inline-block; margin-left: 4px; padding: 1px 6px; border-radius: 999px; font-size: 11px; color: #fff; background: #475569; }
.v3d-chip-status--target { background: #be185d; }
.v3d-chip-status--covers { background: #15803d; }
.v3d-chip-status--variable { background: #b45309; }
.v3d-chip-status--spares { background: #475569; }
.v3d-chip-x { width: 28px; height: 28px; display: inline-flex; align-items: center; justify-content: center; border: 0; border-radius: 50%; background: transparent; color: inherit; cursor: pointer; }
.v3d-chip-x:hover { background: rgba(127, 127, 127, 0.18); }
.v3d-chip-x svg { width: 16px; height: 16px; }

.v3d-caption {
  position: absolute;
  left: 50%;
  bottom: 52px;
  transform: translateX(-50%);
  z-index: 2;
  width: min(560px, calc(100% - 24px));
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--v3d-panel);
  box-shadow: var(--v3d-shadow);
  font-size: 13px;
  text-align: center;
  pointer-events: none;
}
.v3d-caption[hidden] { display: none; }

.v3d-toast {
  position: absolute;
  left: 50%;
  top: 8px;
  transform: translate(-50%, -8px);
  z-index: 4;
  max-width: calc(100% - 120px);
  padding: 8px 12px;
  border-radius: 10px;
  background: #0f172a;
  color: #fff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}
.v3d-toast.is-on { opacity: 1; transform: translate(-50%, 0); }

.v3d-tooltip {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 3;
  padding: 3px 8px;
  border-radius: 6px;
  background: #0f172a;
  color: #fff;
  font-size: 12px;
  pointer-events: none;
  opacity: 0;
  white-space: nowrap;
}
.v3d-tooltip.is-on { opacity: 1; }

.v3d-loading {
  position: absolute;
  inset: auto 0 50% 0;
  text-align: center;
  font-weight: 600;
  color: var(--v3d-muted);
  z-index: 2;
}
.v3d-loading[hidden] { display: none; }

/* Layers panel */
.v3d-panel {
  position: absolute;
  top: 8px;
  right: 58px;
  z-index: 4;
  width: min(300px, calc(100% - 74px));
  max-height: calc(100% - 16px);
  overflow: auto;
  padding: 8px 12px 12px;
  border-radius: 12px;
  background: var(--v3d-panel);
  border: 1px solid var(--v3d-border);
  box-shadow: var(--v3d-shadow);
}
.v3d-panel[hidden] { display: none; }
.v3d-panel-head { display: flex; align-items: center; justify-content: space-between; }
.v3d-panel-title { margin: 0; font-size: 15px; }
.v3d-fs { border: 0; margin: 8px 0 0; padding: 0; }
.v3d-fs legend { font-weight: 700; font-size: 13px; padding: 0; margin-bottom: 4px; }
.v3d-check { display: flex; align-items: flex-start; gap: 6px; padding: 4px 0; font-size: 14px; cursor: pointer; }
.v3d-check input { width: 18px; height: 18px; margin: 1px 0 0; flex: none; accent-color: var(--v3d-accent); }
.v3d-check--part { font-size: 13px; padding: 2px 0; }
.v3d-panel-glb[hidden], .v3d-panel-schematic[hidden] { display: none; }

.v3d-hint { margin: 6px 2px 0; font-size: 12px; color: var(--v3d-muted); }
.v3d-nogl { padding: 24px; text-align: center; color: var(--v3d-muted); }
.v3d-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Compact (phones / narrow panes) */
.v3d.is-compact .v3d-label { font-size: 11px; padding: 1px 5px; }
.v3d.is-compact .v3d-label--probe { max-width: 150px; font-size: 11px; }
.v3d.is-compact .v3d-label--struct { display: none; }
.v3d.is-compact .v3d-legend { font-size: 11px; padding: 4px 6px; }
.v3d.is-compact .v3d-caption { bottom: 48px; font-size: 12px; }
.v3d.is-compact .v3d-hint { font-size: 11px; }

@media (prefers-reduced-motion: reduce) {
  .v3d-btn.is-playing svg { animation: none; }
  .v3d-toast, .v3d-label { transition: none; }
}

/* Labels hidden by the per-frame declutter pass (overlap or under a control) */
.v3d-label.is-occluded { opacity: 0; visibility: hidden; transition: none; }
.v3d-det { margin-top: 8px; }
.v3d-det > summary { cursor: pointer; font-weight: 700; font-size: 13px; padding: 4px 0; display: flex; align-items: center; gap: 6px; }
.v3d-det > summary input { width: 18px; height: 18px; margin: 0; accent-color: var(--v3d-accent); }
.v3d-det > summary:focus-visible { outline: 3px solid var(--v3d-focus); outline-offset: 2px; border-radius: 4px; }
.v3d-subhead { margin: 6px 0 2px; font-size: 12px; font-weight: 700; color: var(--v3d-muted); }