:host {
  display: flex;
  padding: 0;
  margin: 0;

  --default-index-width: 300px;
  --floating-index-layer: 10;
  --toggle-layer: 20;
}

#drawer {
  position: sticky;
  left: 0;
  top: 0;

  --min-width: 0;
  --max-width: var(--index-width, var(--default-index-width));
}

@media (max-width: 700px) {
  #drawer {
    position: fixed;
    left: 0;
    top: 0;
    z-index: var(--floating-index-layer);
  }
}

#toggle {
  visibility: hidden;
  position: fixed;
  bottom: 1.5em;
  left: 1.5em;
  height: 50px;
  width: 50px;
  z-index: var(--toggle-layer);
}

#toggle.show {
  animation: fade-in 0.5s forwards;
}

@keyframes fade-in {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

#toggle.hide {
  animation: fade-out 0.5s forwards;
}

@keyframes fade-out {
  0% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}

#index {
  border-right: 1px solid;
  padding-bottom: 1em;
  background-color: white;
}

.scrollable {
  min-height: 100vh;
  max-height: 100vh;
  overflow-y: scroll;
  position: sticky;
}

#index h1 {
  font-style: inherit;
  font-size: 1.3em;
  font-weight: bold;
  margin: 0;
  padding-top: 1em;
  padding-bottom: 0.5em;
  line-height: 1em;
  text-align: center;
}

#index h2 {
  font-style: inherit;
  font-weight: bold;
  font-size: 1.15em;
}

#index h3 {
  font-style: inherit;
  font-size: 1em;
  padding-left: 1.4em;
}

#index h4 {
  font-style: inherit;
  font-size: 0.9em;
  padding-left: 3em;
}

#index a {
  color: inherit;
  text-decoration: inherit;
}