#fern-nav-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1600;
  width: 100%;
  height: 3px;
  pointer-events: none;
  background-color: var(--accent);
  opacity: 0;
  transform: translate3d(-100%, 0, 0);
  transition: transform 200ms linear, opacity 200ms linear;
}
#fern-nav-progress[data-visible="true"] {
  opacity: 1;
}
#fern-nav-progress::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100px;
  box-shadow: 0 0 10px var(--accent), 0 0 5px var(--accent);
  transform: rotate(3deg) translateY(-4px);
}
@media (prefers-reduced-motion: reduce) {
  #fern-nav-progress {
    transition: none;
  }
}