/* ==========================================================================
   tracker3d.css — "Inside the tracker" interactive 3D section (product.html)
   Pairs with js/tracker3d.js. Uses site design tokens from css/styles.css.
   ========================================================================== */

.tracker3d-shell{
  display:grid;
  grid-template-columns:1.5fr 1fr;
  gap:28px;
  align-items:center;
}

/* ---- stage ---- */
.tracker3d-stage{
  position:relative;
  height:460px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:
    radial-gradient(60% 80% at 50% 30%, var(--accent-soft), transparent 70%),
    var(--panel);
  overflow:hidden;
}
.tracker3d-stage canvas{
  display:block;
  width:100%;
  height:100%;
  touch-action:pan-y;
  cursor:grab;
}
.tracker3d-stage canvas:active{cursor:grabbing}

/* WebGL-unavailable fallback (js swaps in the anatomy illustration) */
.tracker3d-stage.is-fallback img{
  width:100%;height:100%;object-fit:cover;display:block;
}
.tracker3d-shell.is-fallback{grid-template-columns:1fr}
.tracker3d-shell.is-fallback .tracker3d-ui{display:none}

/* ---- "drag to rotate" hint ---- */
.tracker3d-hint{
  position:absolute;
  left:50%;bottom:14px;
  transform:translateX(-50%);
  z-index:3;
  padding:6px 14px;
  border-radius:var(--radius-pill,999px);
  background:var(--panel);
  border:1px solid var(--line-2);
  color:var(--muted);
  font:600 .74rem/1.2 'Space Grotesk','Segoe UI',sans-serif;
  letter-spacing:.06em;
  text-transform:uppercase;
  pointer-events:none;
  opacity:.92;
  transition:opacity .5s ease;
}
.tracker3d-hint.is-hidden{opacity:0}

/* ---- hotspot pins (injected by js) ---- */
.t3d-hotspot{
  position:absolute;
  left:0;top:0;
  transform:translate(-50%,-50%);
  width:30px;height:30px;
  display:flex;align-items:center;justify-content:center;
  padding:0;margin:0;
  background:none;border:0;
  cursor:pointer;
  pointer-events:auto;
  z-index:2;
  transition:opacity .25s ease;
}
.t3d-hotspot.is-behind{opacity:0;pointer-events:none}
/* Coarse pointers: grow the invisible hit-area to >=44px while the visible
   dot stays small and precise. */
@media (pointer:coarse){
  .t3d-hotspot{width:44px;height:44px}
}
/* crosshair-pin inline SVG injected by js (stroke icon, currentColor) */
.t3d-dot{
  display:block;
  width:18px;height:18px;
  color:var(--accent);
  background:none;
  border-radius:0;
  filter:drop-shadow(0 0 4px var(--accent-soft));
  transition:transform .2s ease, filter .2s ease;
}
.t3d-hotspot:hover .t3d-dot,
.t3d-hotspot:focus-visible .t3d-dot,
.t3d-hotspot.active .t3d-dot{
  transform:scale(1.25);
  filter:drop-shadow(0 0 6px var(--accent-soft));
}
.t3d-chip{
  position:absolute;
  bottom:calc(100% + 4px);
  left:50%;
  transform:translateX(-50%) translateY(3px);
  padding:5px 10px;
  border-radius:var(--radius-xs,8px);
  background:var(--panel);
  border:1px solid var(--line-2);
  box-shadow:var(--shadow-sm);
  color:var(--ink);
  font:600 .78rem/1.2 'Space Grotesk','Segoe UI',sans-serif;
  white-space:nowrap;
  opacity:0;
  pointer-events:none;
  transition:opacity .18s ease, transform .18s ease;
}
.t3d-hotspot:hover .t3d-chip,
.t3d-hotspot:focus-visible .t3d-chip,
.t3d-hotspot.active .t3d-chip{
  opacity:1;
  transform:translateX(-50%) translateY(0);
}
.t3d-hotspot:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
  border-radius:50%;
}

/* ---- side panel (explode button, legend, blurb) ---- */
.tracker3d-ui{min-width:0}

.tracker3d-legend{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:0;
  margin:16px 0 0;
}
.tracker3d-legend button{
  font:600 .85rem/1.2 'Space Grotesk','Segoe UI',sans-serif;
  min-height:44px;
  padding:11px 14px;
  border-radius:var(--radius-pill,999px);
  background:var(--panel);
  border:1px solid var(--line-2);
  color:var(--ink);
  cursor:pointer;
  transition:border-color .15s ease, color .15s ease, background .15s ease;
}
.tracker3d-legend button:hover,
.tracker3d-legend button.active{
  border-color:var(--accent);
  color:var(--accent);
  background:var(--accent-soft);
}
.tracker3d-legend button:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}

.tracker3d-blurb{
  min-height:2.8em;
  margin:14px 0 0;
  color:var(--muted);
  font-size:.98rem;
  line-height:1.5;
}

/* ---- responsive ---- */
@media (max-width:900px){
  .tracker3d-shell{grid-template-columns:1fr;gap:18px}
  .tracker3d-stage{height:380px}
}
@media (max-width:560px){
  .tracker3d-stage{height:320px}
}

/* ---- reduced motion: no transitions on decorative bits ---- */
@media (prefers-reduced-motion: reduce){
  .tracker3d-hint,
  .t3d-hotspot,
  .t3d-dot,
  .t3d-chip,
  .tracker3d-legend button{transition:none}
}