/* ==========================================================================
   ASTATINEWEBPRO · FILM GRAIN & CINEMATIC SHADER
   Gives websites an organic analog tactile film texture. Eliminates digital flatness.
   ========================================================================== */

.grain-overlay {
  position: fixed;
  inset: -100%;
  width: 300%;
  height: 300%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035; /* subtle texture */
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  animation: grainJitter 0.5s steps(3) infinite;
}

@keyframes grainJitter {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(-2%, -3%); }
  50%  { transform: translate(3%, 1%); }
  75%  { transform: translate(-1%, 2%); }
  100% { transform: translate(2%, -1%); }
}

@media (prefers-reduced-motion: reduce) {
  .grain-overlay {
    animation: none;
  }
}