/* Site-wide cinematic atmosphere: grain, vignette, light leaks.
   All pointer-events:none so they never block interaction. */

.grain-overlay {
  position: fixed;
  inset: 0;
  z-index: 5000;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  animation: grain-shift 1s steps(6) infinite;
}

@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  20% { transform: translate(-2%, -1%); }
  40% { transform: translate(-1%, 2%); }
  60% { transform: translate(2%, 1%); }
  80% { transform: translate(1%, -2%); }
  100% { transform: translate(0, 0); }
}

.vignette-overlay {
  position: fixed;
  inset: 0;
  z-index: 4999;
  pointer-events: none;
  background: radial-gradient(
    ellipse 80% 80% at 50% 50%,
    transparent 55%,
    color-mix(in srgb, var(--color-bg) 55%, transparent) 100%
  );
}

.light-leak {
  position: absolute;
  pointer-events: none;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  mix-blend-mode: screen;
}

.light-leak--gold {
  background: radial-gradient(circle, color-mix(in srgb, var(--color-gold) 55%, transparent), transparent 70%);
}

.light-leak--violet {
  background: radial-gradient(circle, color-mix(in srgb, var(--color-glow-violet) 55%, transparent), transparent 70%);
}

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

@media (max-width: 640px) {
  .grain-overlay {
    opacity: 0.025;
  }
}

/* A full-viewport fixed layer with mix-blend-mode, animating forever on
   every page, is a heavy and constant cost for mobile GPUs (the browser
   can't take the cheap compositor-only path once a blend mode is
   involved). Purely decorative, so it's the first thing to drop on
   touch/narrow devices. */
@media (max-width: 860px), (pointer: coarse) {
  .grain-overlay {
    display: none;
  }
}