body {
  margin: 0;
}

.toy {
  position: relative;
  margin: 5vmin auto;
  width: 90vmin;
}

.ball {
  position: relative;
  border-radius: 50%;
  width: 90vmin;
  height: 90vmin;
  overflow: hidden;
  background: radial-gradient(circle at 30vmin 30vmin, #444, #000);
}

/* Answers */
.answers {
  width: 90vmin;
  height: 90vmin;
}

.answer {
  position: absolute;
  justify-content: center;
  align-items: center;
  display: flex;
  left: 36vmin;
  top: 34.6vmin;
  width: 18vmin;
  height: 20.8vmin;
  color: white;
  text-align: center;
  font-family: sans-serif;
  font-variant: small-caps;
  font-size: 2.1vmin;
  line-height: 2.4vmin;
  opacity: 0;
  transition: opacity 1s;
  animation: floating 6s linear infinite;
}

/* Triangle */
.answer::before {
  content: "";
  z-index: -1;
  position: absolute;
  left: 0;
  border-left: 8.8vmin solid transparent;
	border-right: 8.8vmin solid transparent;
  border-radius: 0.4vmin;
  width: 0.4vmin;
	height: 0;
}

.answer.up::before {
  top: 0.4vmin;
	border-bottom: 15.2vmin solid #1c23e8;
}

.answer.down::before {
  bottom: 0.4vmin;
	border-top: 15.2vmin solid #1c23e8;
}

/* Overlay */
.answer::after {
  content: "";
  z-index: 1;
  position: absolute;
  left: -7vmin;
  top: -5vmin;
  border-radius: 50%;
  width: 32vmin;
  height: 32vmin;
  background: linear-gradient(to left, rgba(0,0,0,0.9), rgba(0,0,0,0));
  animation: rotating 6s infinite linear;
}

/* Input control */
input {
  display: none;
}

input:checked + .answer {
  opacity: 1;
  transition: opacity 2s 1s;
}

form:active input:checked + .answer {
  opacity: 0;
  transition: opacity 1s;
}

/* Invisible labels */
.labels {
  position: absolute;
  top: 0;
  animation: random 1s steps(20) infinite;
}

form:active .labels {
  animation-play-state: paused;
}

label {
  display: block;
  width: 90vmin;
  height: 90vmin;
  cursor: pointer;
}

/* Window to see the answer */
.window {
  position: absolute;
  left: 22.5vmin;
  top: 22.5vmin;
  width: 45vmin;
  height: 45vmin;
  border-radius: 50%;
  background: radial-gradient(#002, #001 18vmin, #666 18vmin, #000 18.5vmin, #000 22vmin, #666 22vmin, #000 22.5vmin);
}

/* Number 8 */
.eight {
  position: absolute;
  left: 22.5vmin;
  top: 22.5vmin;
  width: 45vmin;
  height: 45vmin;
  border-radius: 50%;
  background: #fff;
  font-size: 27vmin;
  font-family: sans-serif;
  text-align: center;
  line-height: 45vmin;
  transition: opacity 1s;
}

form:valid .eight {
  opacity: 0;
}

/* "Uniform distribution" of labels */
@keyframes random {
  to {
    transform: translateY(-1710vmin);
  }
}

/* Triangle gently floating around */
@keyframes floating {
  from {
    transform: rotateZ(0) rotateY(15deg) translateZ(6.8vmin) rotateZ(0);
  }
  to {
    transform: rotateZ(1turn) rotateY(15deg) translateZ(6.8vmin) rotateZ(-1turn);
  }
}

/* Roatating overlay */
@keyframes rotating {
  to {
    transform: rotate(1turn);
  }
}

/* Instructions */
.instruction {
  z-index: -1;
  position: absolute;
  top: -10vmin;
  left: -10vmin;
  width: 110vmin;
  height: 110vmin;
  text-align: center;
  font-family: fantasy;
  font-size: 3vmin;
  line-height: 4.2vmin;
  opacity: 0;
}

.instruction:nth-of-type(1) {
  transform: rotate(-45deg);
  animation: instruction 1s both;
}

.instruction:nth-of-type(2) {
  transform: rotate(45deg);
  animation: instruction 1s 1s both;
}

.instruction:nth-of-type(3) {
  transform: rotate(-45deg) translateY(102vmin);
  animation: instruction 1s 2s both;
}

.instruction:nth-of-type(4) {
  transform: rotate(45deg) translateY(102vmin);
  animation: instruction 1s 3s both;
}

form:valid ~ .instruction {
  display: none;
}

@keyframes instruction {
  to {
    opacity: 1;
  }
}