.sky {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.layer, .sun, .moon {
  position: absolute;
  inset: 0;
}
.day {
  background:
    radial-gradient(460px 200px at 12% 16%, rgba(255, 244, 232, 0.95), transparent 70%),
    radial-gradient(420px 180px at 82% 10%, rgba(255, 220, 200, 0.92), transparent 72%),
    radial-gradient(520px 220px at 48% 92%, rgba(255, 196, 176, 0.9), transparent 70%),
    radial-gradient(340px 150px at 72% 62%, rgba(255, 232, 214, 0.75), transparent 72%),
    linear-gradient(180deg, #f6c2ae 0%, #f09a86 46%, #e07d90 100%);
  opacity: 0;
  animation: day-sky 48s linear infinite;
}
.dusk {
  background:
    radial-gradient(640px 280px at 50% 0%, rgba(255, 150, 70, 0.55), transparent 68%),
    linear-gradient(180deg, #d2643c 0%, #6e3458 100%);
  opacity: 0;
  animation: dusk-sky 48s linear infinite;
}
.night {
  background:
    radial-gradient(280px 140px at 78% 18%, rgba(88, 72, 140, 0.55), transparent 72%),
    radial-gradient(320px 160px at 12% 86%, rgba(64, 52, 112, 0.5), transparent 72%),
    linear-gradient(180deg, #3a3268 0%, #2a234f 42%, #1a1536 100%);
  opacity: 1;
  animation: night-sky 48s linear infinite;
}
.sun {
  background: radial-gradient(70px 70px at 78% 8%, rgba(255, 214, 90, 0.95), rgba(255, 170, 60, 0) 70%);
  opacity: 0;
  animation: sun-sky 48s linear infinite;
}
.moon {
  background:
    radial-gradient(42px 42px at 22% 7%, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0) 68%),
    radial-gradient(180px 120px at 22% 6%, rgba(200, 214, 255, 0.5), rgba(200, 214, 255, 0) 70%);
  opacity: 1;
  animation: moon-sky 48s linear infinite;
}
@keyframes day-sky {
  0%, 34% { opacity: 0; }
  42%, 62% { opacity: 1; }
  78%, 100% { opacity: 0; }
}
@keyframes night-sky {
  0%, 28% { opacity: 1; }
  42%, 62% { opacity: 0; }
  78%, 100% { opacity: 1; }
}
@keyframes dusk-sky {
  0%, 28% { opacity: 0; }
  35% { opacity: 0.9; }
  42%, 62% { opacity: 0; }
  70% { opacity: 0.9; }
  78%, 100% { opacity: 0; }
}
@keyframes sun-sky {
  0%, 36% { opacity: 0; }
  44%, 60% { opacity: 1; }
  74%, 100% { opacity: 0; }
}
@keyframes moon-sky {
  0%, 34% { opacity: 1; }
  42%, 64% { opacity: 0; }
  78%, 100% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .day, .dusk, .sun { animation: none; opacity: 0; }
  .night, .moon { animation: none; opacity: 1; }
}