.button {
  --stone-50: #fafaf9;
  --stone-800: #292524;
  --yellow-300: #fde047;
  --yellow-400: #facc15;
  --yellow-500: #eab308;
  --black-25: rgba(0, 0, 0, 0.25);

  position: relative;
  display: block;
  width: 4rem;
  height: 4rem;
  cursor: pointer;

  & > button {
    cursor: pointer;
    display: inline-block;
    height: 100%;
    width: 100%;
    appearance: none;
    border: 2px solid var(--stone-800);
    border-radius: 0.25rem;
    background-color: var(--yellow-400);
    outline: 2px solid transparent;
    outline-offset: 2px;
    cursor: pointer;
    transition: background-color 0.2s;

    &:hover {
      background-color: var(--yellow-300);
    }

    &:checked {
      background-color: var(--stone-800);
      border-color: var(--stone-800);

      &:hover {
        background-color: #44403c;
      }
    }

    &:active {
      outline-color: var(--stone-800);
    }

    &:focus-visible {
      outline-color: var(--stone-800);
      outline-style: dashed;
    }
  }

  & > span:nth-child(2) {
    position: absolute;
    inset: 3px;
    pointer-events: none;
    background-color: var(--yellow-400);
    border-bottom: 2px solid var(--black-25);
    transition: transform 75ms;

    &::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: radial-gradient(
          rgb(255 255 255 / 80%) 20%,
          transparent 20%
        ),
        radial-gradient(rgb(255 255 255 / 100%) 20%, transparent 20%);
      background-position:
        0 0,
        4px 4px;
      background-size: 8px 8px;
      mix-blend-mode: hard-light;
      opacity: 0.5;
      animation: dots 0.5s infinite linear;
    }
  }

  & > span:nth-child(3) {
    position: absolute;
    pointer-events: none;
    inset: 0;

    &::before {
      content: "";
      width: 0.375rem;
      height: 0.375rem;
      position: absolute;
      top: 0.25rem;
      left: 0.25rem;
      background-color: var(--stone-800);
      border-radius: 0.125rem;
      box-shadow:
        3.125em 0 var(--stone-800),
        0 3.125em var(--stone-800),
        3.125em 3.125em var(--stone-800);
    }
  }

  & > span:nth-child(4) {
    position: absolute;
    pointer-events: none;
    inset: 0;
    filter: drop-shadow(0.25em 0.25em 0 rgba(0, 0, 0, 0.2));
    transition: all 75ms;

    &::after {
      content: "";
      width: 0.25rem;
      height: 0.25rem;
      position: absolute;
      top: 0.875rem;
      left: 1rem;
      border-radius: 0.0625px;
      background-color: var(--stone-800);
      box-shadow:
        0.75em 2em var(--stone-800),
        1em 2em var(--stone-800),
        0.75em 1.75em var(--stone-800),
        1em 1.75em var(--stone-800),
        0.75em 1.25em var(--stone-800),
        1em 1.25em var(--stone-800),
        0.75em 1em var(--stone-800),
        1em 1em var(--stone-800),
        1em 0.75em var(--stone-800),
        1.5em 0.75em var(--stone-800),
        1.25em 0.75em var(--stone-800),
        1.25em -0.25em var(--stone-800),
        1.5em 0em var(--stone-800),
        1.25em 0.5em var(--stone-800),
        1.5em 0.5em var(--stone-800),
        1.25em 0.25em var(--stone-800),
        1.5em 0.25em var(--stone-800),
        1.25em 0 var(--stone-800),
        1em -0.25em var(--stone-800),
        0.75em -0.25em var(--stone-800),
        0.5em -0.25em var(--stone-800),
        0.25em -0.25em var(--stone-800),
        0.25em 0 var(--stone-800),
        0 0.25em var(--stone-800),
        0 0.5em var(--stone-800),
        0.25em 0.25em var(--stone-800),
        0.25em 0.5em var(--stone-800);
    }
  }

  & > span:nth-child(5) {
    position: absolute;
    background-color: var(--yellow-400);
    border: 2px solid var(--stone-800);
    border-radius: 0.75rem;
    pointer-events: none;
    z-index: -1;
    inset: 0.5rem 1.5rem;
    box-shadow:
      7px 0 0 0 var(--stone-800),
      inset 0 2px 0 0 var(--yellow-300),
      inset 0 -2px 0 0 var(--yellow-500);
    transition: all 0ms cubic-bezier(0, 0.5, 0.4, 1);
  }

  & button:active ~ span:nth-child(5) {
    transform: translateY(-200%);
    transition-duration: 200ms;
    opacity: 0;
  }

  & button:hover ~ span:nth-child(4) {
    filter: drop-shadow(0.125em 0.125em 0 rgba(0, 0, 0, 0.2));
  }
}

@keyframes dots {
  0% {
    background-position:
      0 0,
      4px 4px;
  }
  100% {
    background-position:
      8px 0,
      12px 4px;
  }
}

@media (prefers-color-scheme: dark) {
  .button {
    & button:active,
    & button:focus-visible {
      outline-color: var(--yellow-400);
    }
  }
}