.article-main {
  display: grid;
  gap: 24px;
}
.page-hero {
  display: grid;
  gap: 14px;
}
.toc {
  padding: 18px 16px;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  background: #fff;
}
.toc__title {
  margin: 0 0 12px;
  font-size: 1.05rem;
}
.toc ol {
  margin: 0;
  padding-left: 1.2em;
}
.toc li + li { margin-top: 6px; }
.aside-box {
  padding: 16px;
  border-radius: 16px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
}
@media (min-width: 900px) {
  .article-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 22px;
    align-items: start;
  }
  .article-layout .toc {
    position: sticky;
    top: 92px;
  }
}