.toc {
  margin:60px 0;
}

.toc h4 {
  text-transform: uppercase;
  border-bottom: 2px solid var(--terne);
}

.toc ol {
  counter-reset: chapters;
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.toc li {
  counter-increment: chapters;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--terne);
  padding-bottom: 12px;
  display: grid;
  grid-template-columns: 50px auto;
  align-items: center;
}

.toc a {
  color: var(--contrast);
  font-size: 16px;
}

.toc li::before {
  display: inline-block;
  width: 36px;
  height: 36px;
  vertical-align: middle;
  text-align: center;
  font-size: 1.4em;
  font-weight: 600;
  content: counter(chapters);
  background-color: var(--accent);
  border-radius: 50%;
  transition: transform 100ms ease-in-out;
  line-height: 39px;
}

.toc li.active::before {
  background-color: var(--contrast);
  color: var(--accent);
  transform: scale(1.2);
}

.toc li:hover::before {
  transform: scale(1.2);
}