.preview-area { position: relative !important; }

.preview-processing {
  position: absolute;
  inset: 0;
  z-index: 80;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 10px;
  padding: 28px;
  border-radius: inherit;
  background: rgba(9, 9, 11, .82);
  backdrop-filter: blur(8px);
  text-align: center;
  transition: opacity .2s ease;
}

.preview-processing.hidden { display: none !important; }
.preview-processing small { color: var(--text-muted); }

.preview-spinner {
  width: 44px;
  height: 44px;
  border: 4px solid rgba(255,255,255,.14);
  border-top-color: #d4d4d8;
  border-right-color: #71717a;
  border-radius: 50%;
  animation: previewSpin .8s linear infinite;
  box-shadow: 0 0 24px rgba(255,255,255,.10);
}

@keyframes previewSpin { to { transform: rotate(360deg); } }

.stage {
  overflow: hidden !important;
}

.stage > .empty {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  pointer-events: none;
}

#maskStage {
  display: grid;
  place-items: center;
  min-width: 0;
  padding: 18px;
}

#maskCanvas {
  display: block !important;
  width: auto !important;
  height: auto !important;
  max-width: 100% !important;
  max-height: 100% !important;
  object-fit: contain !important;
  margin: auto !important;
}

#maskCanvas.hidden { display: none !important; }
#vectorPreview,
#threeView { overflow: hidden !important; }

#modelStage,
#vectorStage,
#maskStage {
  background:
    linear-gradient(45deg, rgba(255,255,255,.018) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.018) 75%),
    linear-gradient(45deg, rgba(255,255,255,.018) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.018) 75%),
    #0e0e10 !important;
  background-position: 0 0, 12px 12px !important;
  background-size: 24px 24px !important;
}

.stage-note { justify-content: flex-start !important; }

.measure-field { gap: 8px !important; }
.measure-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.measure-input {
  min-width: 0;
  display: grid;
  gap: 5px;
}
.measure-input > span {
  color: var(--text-muted);
  font-size: .64rem;
  font-weight: 700;
}

.settings-actions {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.settings-warning-copy {
  display: grid;
  gap: 10px;
}
.settings-warning-copy p { margin: 0; }
.settings-warning-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 4px;
}
.settings-warning-actions .action-button { width: 100%; }

.session[data-dirty="true"] .session-state {
  color: var(--warning) !important;
  box-shadow: 0 0 12px rgba(251,191,36,.24);
}