#app {
  margin: 0;
  padding: 1em 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1em;
}

#app > nav {
  display: flex;
  flex-direction: column;
}

#app > nav > a {
  padding: 0.25em 0.5em;
  color: light-dark(var(--light-foreground), var(--dark-foreground));
}

#app > nav > a::before {
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  height: auto;
  right: unset;
  transform: scaleY(0);
  transform-origin: bottom;
}

#app > nav > a:focus::before, #app > nav > a:hover::before {
  transform: scaleY(1);
  transform-origin: top;
}

#app > nav > a[data-current="true"] {
  background-color: color-mix(
    in srgb,
    light-dark(
      var(--light-accent-color),
      var(--dark-accent-color)
    ) 10%,
    transparent
  );
  font-weight: 700;
}

#app > nav > a[data-current="true"]::before {
  transform: scaleY(1);
  transform-origin: top;
}