.snake-scroll {
  --snake-right: 1rem;
  --snake-top: 6.25rem;
  --snake-bottom: 2rem;
  --snake-track-width: 1.35rem;
  --snake-dot-size: 0.42rem;
  --snake-head-size: 0.82rem;
  --snake-dot: rgba(20, 33, 61, 0.2);
  --snake-eaten: rgba(220, 38, 38, 0.34);
  --snake-head: #dc2626;
  --snake-head-shadow: rgba(153, 27, 27, 0.25);

  position: fixed;
  top: var(--snake-top);
  right: var(--snake-right);
  bottom: var(--snake-bottom);
  width: var(--snake-track-width);
  z-index: 1020;
  pointer-events: none;
}

.snake-scroll__track {
  position: relative;
  width: 100%;
  height: 100%;
}

.snake-scroll__dot,
.snake-scroll__trail,
.snake-scroll__head {
  position: absolute;
  left: 50%;
  border-radius: 4px;
  transform: translate(-50%, -50%);
}

.snake-scroll__dot {
  width: var(--snake-dot-size);
  height: var(--snake-dot-size);
  background: var(--snake-dot);
  opacity: 0.9;
  transition: background-color 160ms ease, opacity 160ms ease, transform 160ms ease;
}

.snake-scroll__dot.is-eaten {
  background: var(--snake-eaten);
  opacity: 0.42;
  transform: translate(-50%, -50%) scale(0.72);
}

.snake-scroll__trail {
  width: calc(var(--snake-head-size) * 0.74);
  height: calc(var(--snake-head-size) * 0.74);
  background: rgba(220, 38, 38, 0.32);
  opacity: 0;
  transition: opacity 140ms ease;
}

.snake-scroll__head {
  width: var(--snake-head-size);
  height: var(--snake-head-size);
  background: var(--snake-head);
  box-shadow: 0 0 0 4px var(--snake-head-shadow);
}

.snake-scroll__head::before,
.snake-scroll__head::after {
  content: "";
  position: absolute;
  top: 0.2rem;
  width: 0.11rem;
  height: 0.11rem;
  background: #ffffff;
  border-radius: 50%;
}

.snake-scroll__head::before {
  left: 0.22rem;
}

.snake-scroll__head::after {
  right: 0.22rem;
}

@media (prefers-reduced-motion: reduce) {
  .snake-scroll__dot,
  .snake-scroll__trail {
    transition: none;
  }
}

@media (max-width: 900px), (hover: none) and (pointer: coarse) {
  .snake-scroll {
    display: none;
  }
}

@media print {
  .snake-scroll {
    display: none;
  }
}