/* ==========================================================
   WORLD ENVIRONMENT — one atmosphere for the full experience
   Hero → Social World → Manifesto → Portal
   ========================================================== */

.world-environment {
  position: fixed;

  inset: 0;

  z-index: 0;

  pointer-events: none;

  background-color: #080808;
}

.world-environment::after {
  content: "";

  position: absolute;

  inset: 0;

  opacity: 0.028;

  pointer-events: none;

  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");

  background-size: 180px 180px;

  mix-blend-mode: soft-light;
}

#experience {
  position: relative;

  z-index: 1;
}

/* Homepage carries its own contemporary light surface — landing atmosphere unchanged */

#scene-03 {
  isolation: isolate;
}

body.homepage-entered .world-environment {
  visibility: hidden;
}

@media (prefers-reduced-motion: reduce) {
  .world-environment::after {
    display: none;
  }
}