.inner:has(.ambient-field){isolation:isolate}
.ambient-field{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:-1;
  pointer-events:none;
  background:radial-gradient(ellipse at 74% 28%, #173c7029, transparent 58%),
    radial-gradient(ellipse at 18% 78%, #12305926, transparent 55%);
}