#smoke-stage {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.smoke-layer {
  position: absolute;
  inset: -20%;
  background-repeat: no-repeat;
  will-change: transform, opacity;
}

.smoke-a {
  opacity: 0.7;
  background:
    radial-gradient(ellipse 50% 40% at 18% 88%, rgba(200, 200, 200, 0.2), transparent 70%),
    radial-gradient(ellipse 40% 50% at 72% 92%, rgba(201, 162, 124, 0.16), transparent 68%),
    radial-gradient(ellipse 42% 36% at 48% 62%, rgba(210, 210, 210, 0.1), transparent 70%),
    radial-gradient(ellipse 30% 28% at 50% 100%, rgba(180, 180, 180, 0.12), transparent 70%);
  animation: smoke-drift-a 48s ease-in-out infinite;
}

.smoke-b {
  opacity: 0.52;
  background:
    radial-gradient(ellipse 45% 55% at 80% 70%, rgba(212, 165, 116, 0.16), transparent 65%),
    radial-gradient(ellipse 35% 40% at 12% 40%, rgba(190, 190, 190, 0.12), transparent 70%),
    radial-gradient(ellipse 38% 32% at 58% 28%, rgba(201, 162, 124, 0.1), transparent 68%),
    radial-gradient(ellipse 60% 30% at 48% 85%, rgba(183, 110, 121, 0.08), transparent 72%);
  animation: smoke-drift-b 64s ease-in-out infinite;
}

.smoke-c {
  opacity: 0.38;
  background:
    radial-gradient(ellipse 28% 36% at 62% 20%, rgba(201, 162, 124, 0.08), transparent 70%),
    radial-gradient(ellipse 22% 30% at 30% 18%, rgba(220, 220, 220, 0.05), transparent 68%);
  animation: smoke-drift-c 36s linear infinite;
}

#smoke-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

body.pipe-lit .smoke-a {
  opacity: 0.58;
}

body.pipe-lit .smoke-b {
  opacity: 0.42;
}

@keyframes smoke-drift-a {
  0% { transform: translate3d(-2%, 4%, 0) scale(1); }
  50% { transform: translate3d(3%, -6%, 0) scale(1.06); }
  100% { transform: translate3d(-2%, 4%, 0) scale(1); }
}

@keyframes smoke-drift-b {
  0% { transform: translate3d(3%, 2%, 0) scale(1.04); }
  50% { transform: translate3d(-4%, -8%, 0) scale(1.1); }
  100% { transform: translate3d(3%, 2%, 0) scale(1.04); }
}

@keyframes smoke-drift-c {
  0% { transform: translate3d(0, 8%, 0); }
  100% { transform: translate3d(-4%, -12%, 0); }
}

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

  .smoke-a,
  .smoke-b,
  .smoke-c {
    opacity: 0.28;
  }

  #smoke-canvas {
    display: none;
  }
}