*,
*::after,
*::before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --boxColor: rgba(141, 241, 74, 0.808);
  --colorBola: rgb(255, 42, 191);
  --velocidadRotacion: 10s; /* Para dar 1 vuelta */
  --saltoBola: 0.7s; /* Para dar 1 salto */
}

body {
  background-color: #000;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 75px;
  perspective: 8em;
  perspective-origin: 50% calc(50% - 2em);
  overflow: hidden;
}

.escena {
  position: relative;
  transform-style: preserve-3d;
  animation: giroEscena var(--velocidadRotacion) infinite linear;
}

@keyframes giroEscena {
  to {
    transform: rotateY(360deg);
  }
}

.bola {
  width: 1em;
  height: 1em;
  border-radius: 50%;
  position: absolute;
  left: -0.5em;
  bottom: 1em;
  background-image: radial-gradient(
    circle at top,
    var(--colorBola),
    50%,
    rgba(59, 53, 53, 0.883)
  );

  animation: bolaSaltando var(--saltoBola) infinite ease-out,
    giroEscena var(--velocidadRotacion) infinite linear reverse;
  z-index: -1;
}

@keyframes bolaSaltando {
  0%,
  100% {
    bottom: 0.7em;
  }
  50% {
    bottom: 3em;
    animation-timing-function: ease-in;
  }
}

.sombra__bola {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(#0007, #0000 50%);
  animation: sombreBola var(--saltoBola) infinite ease-out;
}

@keyframes sombreBola {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    opacity: 0.5;
    transform: scale(2);
    animation-timing-function: ease-in;
  }
}

.cubo {
  width: 2em;
  height: 2em;

  position: absolute;
  bottom: -1em;
  left: -1em;
  animation: alturaCubo var(--saltoBola) infinite linear;
  transform-style: preserve-3d;
}

@keyframes alturaCubo {
  0%,
  100% {
    height: 1.8em;
  }
  10%,
  96% {
    height: 2em;
  }
}

.derecha,
.izquierda,
.frente,
.fondo {
  position: absolute;
  width: 100%;
  height: 100%;
  background: var(--boxColor);
  box-shadow: 0 0 0.5em rgba(0, 0, 0, 0.527) inset;
}

.frente {
  transform: translateZ(1em);
}

.derecha {
  transform: rotateY(90deg) translateZ(1em);
}

.fondo {
  transform: rotateY(180deg) translateZ(1em);
}
.izquierda {
  transform: rotateY(270deg) translateZ(1em);
}

.arriba {
  position: absolute;
  width: 2em;
  height: 2em;
  background: var(--boxColor);
  transform: translateY(-50%) rotateX(90deg);
  box-shadow: 0 0 0.5em rgba(0, 0, 0, 0.527) inset;
}

.abajo {
  position: absolute;
  width: 2em;
  height: 2em;
  background: #0007;
  bottom: 0;
  transform: translateY(50%) rotateX(90deg);
  box-shadow: 0 0 0.5em #000;
}

.piso {
  position: absolute;
  top: 1em;
  transform: translate(-50%, -50%) rotateX(90deg);
  width: 6em;
  height: 6em;
  background-image: radial-gradient(
      rgba(70, 66, 66, 0.027),
      rgba(59, 52, 52, 0.274)
    ),
    repeating-conic-gradient(from 45deg, #111 0deg 90deg, #222 90deg 180deg);
  background-size: 60%, 1em 1em;
}