.spec-layout {
  display: grid;
  grid-template-columns: 15rem minmax(0, 72ch);
  gap: clamp(2rem, 4vw, 4rem);
  max-inline-size: 1240px;
  margin-inline: auto;
  padding: 3rem var(--gutter) 6rem;
}
.spec-layout aside { min-inline-size: 0; }
.spec-contents {
  position: sticky;
  inset-block-start: 7rem;
  font-size: 0.875rem;
  border-block: 1px solid var(--line);
  padding-block: 1rem;
}
.spec-contents summary { cursor: pointer; font-weight: 650; padding-block: 0.25rem; }
.spec-contents nav { max-block-size: calc(100dvh - 12rem); overflow-y: auto; }
.spec-contents ol { list-style: none; margin: 1rem 0 0; padding: 0; }
.spec-contents li { margin-block: 0.6rem; }
.spec-contents .spec-depth-3 { padding-inline-start: 1rem; }
.spec-layout main { min-inline-size: 0; }
.spec-layout h1 { font-size: clamp(1.75rem, 3vw, 2.8rem); line-height: 1.3; margin-block-end: 1rem; }
.spec-layout h2 { font-size: 1.5rem; margin-block: 3rem 1rem; }
.spec-layout h3 { font-size: 1.15rem; margin-block: 2rem 0.75rem; }
.spec-layout p, .spec-layout li { max-inline-size: 72ch; overflow-wrap: anywhere; }
.spec-note { color: var(--muted); border-block-end: 1px solid var(--line); padding-block-end: 1.5rem; margin-block-end: 2rem; }
.spec-layout pre {
  direction: ltr;
  unicode-bidi: isolate;
  overflow: auto;
  padding: 1.25rem;
  background: var(--paper);
  border: 1px solid var(--line);
  font-size: 0.875rem;
  line-height: 1.75;
}
.spec-layout code { overflow-wrap: anywhere; }
.spec-layout pre code { overflow-wrap: normal; }
.spec-table { overflow-x: auto; margin-block: 1.5rem; }
.spec-table table { border-collapse: collapse; min-inline-size: 100%; font-size: 0.875rem; }
.spec-table th, .spec-table td { padding: 0.75rem; border: 1px solid var(--line); text-align: start; vertical-align: top; }
.spec-table th { background: var(--paper); }
.spec-layout blockquote { margin-inline: 0; padding-inline: 1.5rem; color: var(--muted); }
.spec-footer { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-block-start: 3rem; padding-block-start: 1.5rem; border-block-start: 1px solid var(--line); }
@media (max-width: 800px) {
  .spec-layout { grid-template-columns: minmax(0, 1fr); gap: 2rem; padding-block-start: 1.5rem; }
  .spec-contents { position: static; }
  .spec-contents nav { max-block-size: 10rem; }
  .spec-page .site-header { gap: 1rem; padding-inline: 18px; }
  .spec-page .site-header nav { flex: 1; }
}