Sunset Toggle Switch

<label class="tgl-sunset-toggle">
  <input type="checkbox" role="switch" aria-label="Night mode">
  <span class="tgl-sunset-toggle-scene" aria-hidden="true">
    <span class="tgl-sunset-toggle-night"></span>
    <span class="tgl-sunset-toggle-arm">
      <span class="tgl-sunset-toggle-sun"></span>
      <span class="tgl-sunset-toggle-moon"></span>
    </span>
    <span class="tgl-sunset-toggle-hills"></span>
  </span>
</label>

.tgl-sunset-toggle {
  --c: var(--tgl-color, #3b82f6);
  font-size: var(--tgl-size, 24px);
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.tgl-sunset-toggle input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 1;
}
.tgl-sunset-toggle-scene {
  position: relative;
  display: block;
  width: 7.2em;
  height: 3.2em;
  border-radius: 1.6em;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(to bottom, color-mix(in srgb, var(--c) 60%, #bae6fd), #fef3c7);
  box-shadow: inset 0 0.1em 0.25em rgba(0, 0, 0, 0.25);
}
.tgl-sunset-toggle-night {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, #0b1026, color-mix(in srgb, var(--c) 35%, #1e1b4b));
  opacity: 0;
  transition: opacity 0.9s ease 0.1s;
}
.tgl-sunset-toggle-night::before {
  content: "";
  position: absolute;
  top: 0.5em;
  left: 2.6em;
  width: 0.12em;
  height: 0.12em;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0.9em 0.4em 0 #fff, 1.8em -0.1em 0 0.02em #fff, 2.7em 0.6em 0 #fff, 3.5em 0.15em 0 0.02em #fff, 1.2em 1.1em 0 #fff, -1.2em 0.8em 0 #fff;
}
/* the arm pivots under the middle of the horizon */
.tgl-sunset-toggle-arm {
  position: absolute;
  left: 50%;
  top: 4.2em;
  width: 0;
  height: 0;
  transform: rotate(-30deg);
  transition: transform 1.1s cubic-bezier(0.55, 0, 0.25, 1);
}
.tgl-sunset-toggle-sun,
.tgl-sunset-toggle-moon {
  position: absolute;
  border-radius: 50%;
}
.tgl-sunset-toggle-sun {
  left: -0.55em;
  top: -3.55em;
  width: 1.1em;
  height: 1.1em;
  background: radial-gradient(circle at 40% 40%, #fff7cc, #fcd34d 55%, #f59e0b);
  box-shadow: 0 0 0.6em 0.15em rgba(252, 211, 77, 0.6);
}
.tgl-sunset-toggle-moon {
  left: -0.5em;
  top: 2.5em;
  width: 1em;
  height: 1em;
  background:
    radial-gradient(circle at 35% 40%, #cbd5e1 0 0.12em, transparent 0.14em),
    radial-gradient(circle at 62% 65%, #cbd5e1 0 0.16em, transparent 0.18em),
    #f1f5f9;
  box-shadow: 0 0 0.5em 0.05em rgba(241, 245, 249, 0.45);
}
.tgl-sunset-toggle-hills::before,
.tgl-sunset-toggle-hills::after {
  content: "";
  position: absolute;
  height: 3em;
  border-radius: 50%;
  transition: background-color 0.9s ease;
}
.tgl-sunset-toggle-hills::before {
  left: -1.2em;
  top: 2.2em;
  width: 5.4em;
  background-color: #86d99b;
}
.tgl-sunset-toggle-hills::after {
  right: -1.5em;
  top: 2.45em;
  width: 6.2em;
  background-color: #3fae63;
}
.tgl-sunset-toggle input:checked + .tgl-sunset-toggle-scene .tgl-sunset-toggle-night { opacity: 1; }
.tgl-sunset-toggle input:checked + .tgl-sunset-toggle-scene .tgl-sunset-toggle-arm { transform: rotate(150deg); }
.tgl-sunset-toggle input:checked + .tgl-sunset-toggle-scene .tgl-sunset-toggle-hills::before { background-color: #23364f; }
.tgl-sunset-toggle input:checked + .tgl-sunset-toggle-scene .tgl-sunset-toggle-hills::after { background-color: #15253a; }
.tgl-sunset-toggle input:focus-visible + .tgl-sunset-toggle-scene {
  outline: 2px solid var(--c);
  outline-offset: 0.2em;
}

@media (prefers-reduced-motion: reduce) {
  .tgl-sunset-toggle, .tgl-sunset-toggle *, .tgl-sunset-toggle::before, .tgl-sunset-toggle::after, .tgl-sunset-toggle *::before, .tgl-sunset-toggle *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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