/* ─────────────────────────────────────────────────────────────────────────────
   e12-grain.css — animated film grain overlay + organic noise texture
   Pure CSS — no JS dependency
───────────────────────────────────────────────────────────────────────────── */

/* Inject grain via body::after pseudo-element */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.032;
  will-change: transform;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='grain'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23grain)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
  animation: grain-shift 0.8s steps(1) infinite;
}

@keyframes grain-shift {
  0%   { transform: translate(0px,   0px); }
  10%  { transform: translate(-2px,  1px); }
  20%  { transform: translate(3px,  -2px); }
  30%  { transform: translate(-1px,  3px); }
  40%  { transform: translate(2px,  -1px); }
  50%  { transform: translate(-3px,  2px); }
  60%  { transform: translate(1px,  -3px); }
  70%  { transform: translate(-2px, -1px); }
  80%  { transform: translate(3px,   2px); }
  90%  { transform: translate(-1px, -2px); }
  100% { transform: translate(2px,   1px); }
}

/* Vignette — subtle edge darkening for depth */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  background: radial-gradient(
    ellipse 90% 80% at 50% 50%,
    transparent 60%,
    oklch(3.5% 0.015 265 / 0.4) 100%
  );
}

/* Hero gets slightly heavier grain treatment */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='g2'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g2)'/%3E%3C/svg%3E") repeat;
  background-size: 256px 256px;
  opacity: 0.04;
  mix-blend-mode: overlay;
  z-index: 1;
}

/* Reduced motion — freeze grain, keep vignette */
@media (prefers-reduced-motion: reduce) {
  body::after {
    animation: none;
  }
}