/* Shared, language-neutral artwork inside the existing investigation slots. */
#investigation .wt-step-shot.has-art {
  position:relative;
  overflow:hidden;
  border-color:transparent;
}
#investigation .wt-step-shot.has-art img {
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:contain;
  display:block;
  mask-image:linear-gradient(to right,transparent,#000 6%,#000 94%,transparent),linear-gradient(to bottom,transparent,#000 6%,#000 92%,transparent);
  mask-composite:intersect;
}
/* Vector line illustrations keep their precise, unfiltered edges at every size. */
#investigation .wt-step-shot.has-art img[src$=".svg"] { mask-image:none; }