.sky {
  --sky-transition-duration: 5.4s;

  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.sky-gradient,
.sky-glow,
.celestial-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.sky-gradient {
  transform: scale(1.035);
  animation: sky-breathe 18s ease-in-out infinite alternate;
}

.sky-phase-layer {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      to bottom,
      var(--phase-top) 0%,
      var(--phase-middle) 48%,
      var(--phase-horizon) 72%,
      var(--phase-lower-horizon) 100%
    );
  opacity: 0;
  transition: opacity var(--sky-transition-duration) ease;
  will-change: opacity;
}

.sky-phase-layer--sunset {
  --phase-top: var(--sky-sunset-top);
  --phase-middle: var(--sky-sunset-middle);
  --phase-horizon: var(--sky-sunset-horizon);
  --phase-lower-horizon: var(--sky-sunset-lower-horizon);
  opacity: 1;
}

.sky-phase-layer--dusk {
  --phase-top: var(--sky-dusk-top);
  --phase-middle: var(--sky-dusk-middle);
  --phase-horizon: var(--sky-dusk-horizon);
  --phase-lower-horizon: var(--sky-dusk-lower-horizon);
}

.sky-phase-layer--blue-hour {
  --phase-top: var(--sky-blue-hour-top);
  --phase-middle: var(--sky-blue-hour-middle);
  --phase-horizon: var(--sky-blue-hour-horizon);
  --phase-lower-horizon: var(--sky-blue-hour-lower-horizon);
}

.sky-phase-layer--deep-blue {
  --phase-top: var(--sky-deep-blue-top);
  --phase-middle: var(--sky-deep-blue-middle);
  --phase-horizon: var(--sky-deep-blue-horizon);
  --phase-lower-horizon: var(--sky-deep-blue-lower-horizon);
}

.sky-phase-layer--night {
  --phase-top: var(--sky-night-top);
  --phase-middle: var(--sky-night-middle);
  --phase-horizon: var(--sky-night-horizon);
  --phase-lower-horizon: var(--sky-night-lower-horizon);
}

.sky[data-sky-phase]:not([data-sky-phase="sunset"]) .sky-phase-layer--sunset {
  opacity: 0;
}

.sky[data-sky-phase="dusk"] .sky-phase-layer--dusk,
.sky[data-sky-phase="blue-hour"] .sky-phase-layer--blue-hour,
.sky[data-sky-phase="deep-blue"] .sky-phase-layer--deep-blue,
.sky[data-sky-phase="night"] .sky-phase-layer--night {
  opacity: 1;
}

.sky-glow {
  background:
    radial-gradient(
      circle at 50% 74%,
      var(--sky-glow) 0%,
      var(--sky-glow-soft) 28%,
      rgba(var(--light-color), 0) 58%
    );
  transform: translate3d(-1.5%, 0, 0) scale(1.04);
  animation: sky-glow-drift 15s ease-in-out infinite alternate;
}

.moon,
.ambient-stars {
  position: absolute;
  transition:
    opacity var(--sky-transition-duration) ease 0.5s,
    transform var(--sky-transition-duration) ease;
}

.moon {
  top: 12%;
  right: 14%;
  width: clamp(2.8rem, 6vw, 5.4rem);
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(255, 244, 212, 0.78);
  box-shadow: 0 0 3rem rgba(255, 231, 176, 0.2);
  opacity: 0;
  transform: translateY(0.7rem);
}

.ambient-stars {
  inset: 5% 4% 28%;
  opacity: 0;
  animation: star-field-drift 28s ease-in-out infinite alternate;
}

.ambient-star {
  --star-duration: 3.8s;
  --star-delay: 0s;

  position: absolute;
  left: var(--star-left);
  top: var(--star-top);
  width: var(--star-size, 2px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: #fff3c8;
  box-shadow:
    0 0 0.35rem rgba(255, 238, 183, 0.72),
    0 0 0.9rem rgba(255, 225, 145, 0.22);
  animation: ambient-star-twinkle var(--star-duration) ease-in-out var(--star-delay) infinite;
}

.ambient-star::before,
.ambient-star::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1px;
  height: var(--star-ray, 0.55rem);
  border-radius: 50%;
  background: linear-gradient(to bottom, transparent, rgba(255, 247, 218, 0.72), transparent);
  transform: translate(-50%, -50%);
}

.ambient-star::after {
  transform: translate(-50%, -50%) rotate(90deg) scaleY(0.62);
}

.ambient-star--one {
  --star-left: 7%;
  --star-top: 42%;
  --star-duration: 3.1s;
  --star-delay: -0.7s;
}

.ambient-star--two {
  --star-left: 18%;
  --star-top: 15%;
  --star-size: 1.5px;
  --star-ray: 0.44rem;
  --star-duration: 4.6s;
  --star-delay: -2.2s;
}

.ambient-star--three {
  --star-left: 31%;
  --star-top: 54%;
  --star-size: 1.7px;
  --star-duration: 3.7s;
  --star-delay: -1.3s;
}

.ambient-star--four {
  --star-left: 46%;
  --star-top: 23%;
  --star-size: 1.4px;
  --star-ray: 0.42rem;
  --star-duration: 5.2s;
  --star-delay: -3.5s;
}

.ambient-star--five {
  --star-left: 58%;
  --star-top: 45%;
  --star-size: 1.7px;
  --star-duration: 4.1s;
  --star-delay: -0.3s;
}

.ambient-star--six {
  --star-left: 76%;
  --star-top: 11%;
  --star-size: 2.2px;
  --star-ray: 0.62rem;
  --star-duration: 3.4s;
  --star-delay: -1.8s;
}

.ambient-star--seven {
  --star-left: 88%;
  --star-top: 48%;
  --star-size: 1.4px;
  --star-ray: 0.42rem;
  --star-duration: 4.8s;
  --star-delay: -2.9s;
}

.ambient-star--eight {
  --star-left: 97%;
  --star-top: 25%;
  --star-size: 1.8px;
  --star-duration: 3.6s;
  --star-delay: -0.9s;
}

.ambient-star--nine {
  --star-left: 12%;
  --star-top: 73%;
  --star-size: 1.35px;
  --star-ray: 0.4rem;
  --star-duration: 4.3s;
  --star-delay: -3.1s;
}

.ambient-star--ten {
  --star-left: 38%;
  --star-top: 8%;
  --star-size: 1.3px;
  --star-ray: 0.4rem;
  --star-duration: 3.3s;
  --star-delay: -1.6s;
}

.ambient-star--eleven {
  --star-left: 67%;
  --star-top: 67%;
  --star-size: 1.55px;
  --star-duration: 5s;
  --star-delay: -2.5s;
}

.ambient-star--twelve {
  --star-left: 93%;
  --star-top: 72%;
  --star-size: 1.3px;
  --star-ray: 0.4rem;
  --star-duration: 3.9s;
  --star-delay: -0.4s;
}

.atmosphere {
  background:
    linear-gradient(
      to bottom,
      rgba(var(--light-color), 0) 46%,
      rgba(var(--light-color), 0.08) 57%,
      rgba(var(--light-color), 0.03) 68%,
      rgba(var(--light-color), 0) 78%
    );
}

.sky[data-sky-phase="dusk"] .moon {
  opacity: 0.28;
}

.sky[data-sky-phase="blue-hour"] .moon {
  opacity: 0.72;
  transform: translateY(0);
}

.sky[data-sky-phase="deep-blue"] .moon,
.sky[data-sky-phase="night"] .moon {
  opacity: 0.88;
  transform: translateY(0);
}

.sky[data-sky-phase="blue-hour"] .ambient-stars {
  opacity: 0.34;
}

.sky[data-sky-phase="deep-blue"] .ambient-stars {
  opacity: 0.72;
}

.sky[data-sky-phase="night"] .ambient-stars {
  opacity: 1;
}

@keyframes sky-breathe {
  from {
    transform: scale(1.035) translateY(0);
  }

  to {
    transform: scale(1.055) translateY(-0.7%);
  }
}

@keyframes sky-glow-drift {
  from {
    transform: translate3d(-1.5%, 0.4%, 0) scale(1.04);
  }

  to {
    transform: translate3d(1.5%, -0.4%, 0) scale(1.08);
  }
}

@keyframes star-field-drift {
  from {
    transform: translate3d(-0.15%, 0, 0);
  }

  to {
    transform: translate3d(0.35%, -0.4%, 0);
  }
}

@keyframes ambient-star-twinkle {
  0%,
  100% {
    opacity: 0.28;
    transform: scale(0.58) rotate(0deg);
  }

  42% {
    opacity: 1;
    transform: scale(1.45) rotate(8deg);
  }

  58% {
    opacity: 0.62;
    transform: scale(0.9) rotate(12deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .sky-gradient,
  .sky-glow,
  .ambient-stars,
  .ambient-star {
    animation: none;
  }

  .sky-phase-layer {
    transition-duration: 0.01ms;
  }
}