.post-series {
  margin: 2rem 0;
  border: 1px solid #ddd;
}

.post-series h2 {
  margin: 0;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid #ddd;
  color: #4054d6;
  font-size: 1.1rem;
  line-height: 1.3;
}

.post-series ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.post-series__item + .post-series__item {
  border-top: 1px solid #eee;
}

.post-series__row {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.8rem;
  align-items: center;
  padding: 0.85rem 1rem;
  color: #555;
}

a.post-series__row:link,
a.post-series__row:active,
a.post-series__row:visited {
  color: #555;
}

a.post-series__row:hover {
  background: whitesmoke;
  text-decoration: none;
}

.post-series__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: #eee;
  color: #666;
  font-size: 0.95rem;
}

.post-series__title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.post-series__item.is-current .post-series__row {
  color: #111;
  font-weight: 700;
}

.post-series__item.is-current .post-series__number {
  background: #4054d6;
  color: white;
  font-weight: 400;
}

@media screen and (max-width: 899px) {
  .post-series {
    margin: 1.5rem 0;
  }

  .post-series__title {
    white-space: normal;
  }
}