/* Grain minéral — matière volontairement presque imperceptible. */
body::after{
  content:'';
  position:fixed;
  inset:0;
  z-index:10000;
  pointer-events:none;
  opacity:.075;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 140 140' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.94' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.9'/%3E%3C/svg%3E");
  background-size:140px 140px;
  mix-blend-mode:overlay;
}

@media(prefers-reduced-transparency:reduce){
  body::after{display:none}
}