/* 3D Viewer — EZL-STL */
.viewer-shell {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  height: calc(100vh - var(--header-height));
}
@media (max-width: 1280px) { .viewer-shell { grid-template-columns: 240px 1fr 280px; } }
@media (max-width: 1024px) {
  .viewer-shell { grid-template-columns: 1fr; grid-template-rows: auto 1fr auto; height: auto; }
  .viewer-panel-right { order: 3; }
}

.viewer-panel-left, .viewer-panel-right {
  background: rgba(255,255,255,0.02);
  border-right: 1px solid var(--border-subtle);
  padding: 16px;
  overflow-y: auto;
}
.viewer-panel-right { border-right: none; border-left: 1px solid var(--border-subtle); }

.viewer-canvas-wrap {
  position: relative;
  background: radial-gradient(circle at center, #1a2438 0%, #0a0f1c 100%);
  overflow: hidden;
}
#viewer-canvas { width: 100%; height: 100%; display: block; }

.viewer-toolbar {
  position: absolute;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 6px;
  background: rgba(11,18,32,0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 6px;
  z-index: 10;
}
.viewer-toolbar button {
  background: transparent; border: none;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
}
.viewer-toolbar button:hover { background: rgba(255,255,255,0.06); color: var(--text-primary); }
.viewer-toolbar button.active { background: rgba(14,165,233,0.18); color: var(--color-primary); }

.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: 14px;
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  font-size: 13px;
  color: var(--text-secondary);
}
.dropzone.drag { border-color: var(--color-primary); background: rgba(14,165,233,0.08); color: var(--color-primary); }

.measurement-row {
  display: flex; justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 13px;
}
.measurement-row .label { color: var(--text-secondary); }
.measurement-row .value { font-weight: 600; color: var(--text-primary); font-family: 'Inter', monospace; }
.measurement-row .value.warn { color: var(--color-warning); }
.measurement-row .value.danger { color: var(--color-danger); }
.measurement-row .value.success { color: var(--color-success); }

.tooth-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  margin-top: 8px;
}
.tooth {
  aspect-ratio: 1;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 10px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all .15s;
}
.tooth:hover { border-color: var(--color-primary); color: var(--color-primary); }
.tooth.selected { background: rgba(14,165,233,0.2); border-color: var(--color-primary); color: var(--color-primary); font-weight: 600; }

.empty-3d {
  position: absolute;
  inset: 0;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 8px;
  color: var(--text-muted);
  text-align: center;
  pointer-events: none;
}