.topic-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 280px);
  gap: 2rem 2.5rem;
  align-items: start;
}

.topic-main img.topic-hero {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  margin: 0 0 1.25rem;
}

.topic-main h2 {
  margin-top: 1.75rem;
}

.topic-main h3 {
  margin-top: 1.35rem;
}

.topic-main ul,
.topic-main ol {
  margin: 0.75rem 0 1rem 1.25rem;
}

.topic-main li {
  margin-bottom: 0.4rem;
}

.topic-callout {
  margin: 1.5rem 0;
  padding: 1rem 1.15rem;
  border-left: 3px solid rgba(0, 0, 0, 0.25);
  background: rgba(0, 0, 0, 0.03);
}

.topic-related {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(0, 0, 0, 0.12);
}

@media (max-width: 900px) {
  .topic-layout {
    grid-template-columns: 1fr;
  }
}