@layer reading {
  .page-sources .desk-section { border-top: 2px solid var(--edge); padding-top: 1.1rem; }
  .page-sources .desk-section h2 { max-width: 24ch; }
  .page-sources .footnote-desk { background: var(--wash); border-top: 0; padding: 1.4rem; }
  .page-sources .note-letter { color: var(--deep-field); }
}