.manual-intro {
  margin-bottom: 32px;
}
.manual-intro h1 {
  margin-top: 12px;
  margin-bottom: 20px;
}
.manual-summary {
  max-width: 36em;
  font-size: 20px;
  line-height: 1.7;
  color: var(--c-text);
}
.manual-chapter {
  padding-top: 12px;
  padding-bottom: 36px;
  scroll-margin-top: 180px;
}
.manual-chapter + .manual-chapter {
  border-top: 1px solid var(--c-border);
  padding-top: 40px;
}
.manual-chapter h2 {
  margin-top: 0;
}
.manual-chapter h3[id] {
  scroll-margin-top: 180px;
}
@media (max-width: 640px) {
  .manual-summary {
    font-size: 18px;
  }
  .manual-chapter,
  .manual-chapter h3[id] {
    scroll-margin-top: 24px;
  }
}