/* Marble board */
.marble-board {
  --marble-track-border-width: 2px;
  --marble-track-size: 10%;
  --marble-size: 9%;
  aspect-ratio: 1 / 1;
  box-shadow: 0 0 0 var(--marble-track-border-width)
    rgb(var(--color-foreground));
  border-radius: 50%;
  margin: 20px auto;
  max-width: 600px;
  position: relative;
}

.marble-lane {
  --offset: calc(var(--marble-track-size) * var(--marble-track-index));
  aspect-ratio: 1 / 1;
  border: rgb(var(--color-foreground))
    calc(var(--marble-track-border-width) / 2) solid;
  box-shadow: 0 0 0 calc(var(--marble-track-border-width) / 2);
  border-radius: 50%;
  left: var(--offset, 0);
  position: absolute;
  transform-origin: center center;
  top: var(--offset, 0);
  width: calc(
    100% - (var(--marble-track-size) * var(--marble-track-index, 1) * 2)
  );
}

.marble-lane:nth-child(1) {
  --marble-track-index: 1;
}

.marble-lane:nth-child(2) {
  --marble-track-index: 2;
}

.marble-lane:nth-child(3) {
  --marble-track-index: 3;
}

.marbles {
  align-items: center;
  display: grid;
  grid-template-rows: repeat(10, 10%);
  grid-template-columns: repeat(10, 10%);
  justify-content: center;
  left: 0;
  height: 100%;
  position: absolute;
  top: 0;
  width: 100%;
}

.marble {
  animation: marbleOrbit 40s linear infinite;
  aspect-ratio: 1 / 1;
  max-height: 90%;
  border-radius: 50%;
  margin: auto;
  max-width: 90%;
  transition: rotate 2s;
  width: 100%;
  will-change: rotate;
}

.marble:nth-child(1) {
  grid-row: 5/7;
  transform-origin: 550% 50%;
}

.marble:nth-child(2) {
  animation-timing-function: cubic-bezier(0.71, 0.32, 0.37, 0.82);
  grid-column: 5/7;
  grid-row: 2;
  height: 90%;
  transform-origin: 50% 440%;
  width: auto;
}

.marble:nth-child(3) {
  animation-timing-function: cubic-bezier(0.68, -0.55, 0.27, 1.55);
  grid-column: 4;
  grid-row: 3/5;
  rotate: 180deg;
  transform-origin: 218% 270%;
}

.marble:nth-child(4) {
  grid-column: 7/9;
  grid-row: 7;
  width: auto;
  height: 90%;
  transform-origin: -170% -118%;
}

.marble:nth-child(5) {
  animation-timing-function: cubic-bezier(0.03, 0.77, 0.81, 0.65);
  grid-column: 5/7;
  grid-row: 9;
  width: auto;
  height: 90%;
  transform-origin: 50% -340%;
  will-change: transform;
}

.marble:nth-child(6) {
  grid-column: 10;
  grid-row: 5/7;
  transform-origin: -450% 50%;
}

@keyframes marbleOrbit {
  from {
    rotate: 0deg;
  }
  to {
    rotate: 360deg;
  }
}