.atlas-field-surface {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.atlas-field-surface > .atlas-field-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.atlas-field-surface > :not(.atlas-field-canvas):not(.card-signature) {
  position: relative;
  /* Keep copy above ambient vignettes (::after is typically z-index 2–3). */
  z-index: 4;
}

.atlas-field-surface--ambient > .atlas-field-canvas,
.atlas-field-surface--card > .atlas-field-canvas {
  mix-blend-mode: screen;
}

@media (prefers-reduced-motion: reduce) {
  .atlas-field-surface > .atlas-field-canvas {
    transition: none;
  }
}