.cube-demo {
  width: 300px;
  max-width: 100%;
  margin-top: 24px;
}

.cube-stage {
  --cube-size: min(160px, 50vw);
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  background: transparent;
  appearance: none;
  perspective: 700px;
  cursor: grab;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.cube-stage.is-dragging {
  cursor: grabbing;
}

.cube-stage:focus-visible {
  outline: 2px solid #76b900;
  outline-offset: 2px;
}

.cube {
  position: relative;
  width: var(--cube-size);
  height: var(--cube-size);
  transform-style: preserve-3d;
  transform: rotateX(-20deg) rotateY(-30deg);
  pointer-events: none;
}

.cube-face {
  position: absolute;
  inset: 0;
  box-sizing: border-box;
  border: 1px solid #111;
  background: #222 url("images/nvidia-cube.svg") center / 100% 100% no-repeat;
  backface-visibility: hidden;
}

.cube-face::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgb(0 0 0 / var(--shade, 0));
}

.cube-front {
  transform: translateZ(calc(var(--cube-size) * 0.5));
}

.cube-back {
  --shade: 0.12;
  transform: rotateY(180deg) translateZ(calc(var(--cube-size) * 0.5));
}

.cube-right {
  --shade: 0.22;
  transform: rotateY(90deg) translateZ(calc(var(--cube-size) * 0.5));
}

.cube-left {
  --shade: 0.15;
  transform: rotateY(-90deg) translateZ(calc(var(--cube-size) * 0.5));
}

.cube-top {
  --shade: 0.04;
  transform: rotateX(90deg) translateZ(calc(var(--cube-size) * 0.5));
}

.cube-bottom {
  --shade: 0.28;
  transform: rotateX(-90deg) translateZ(calc(var(--cube-size) * 0.5));
}

.cube-hint {
  margin: 0 0 24px;
  color: #666;
  font-size: 12px;
  line-height: 1.5;
  text-align: center;
}