/* Perslis Defense · evolution hero: fade the stage out at its top and bottom so the falling sparks and the
   root rings dissolve into the band instead of stopping at the canvas edge. Decorative only. */
.d3-hero .d3-stage canvas {
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 9%, #000 84%, transparent 100%);
          mask-image: linear-gradient(to bottom, transparent 0, #000 9%, #000 84%, transparent 100%);
}