/* Build88 | Beyond the Title: consistent full-width About frame.
   Adjust only the BTT outer editorial shell to match the full-bleed About pages.
   Do not change HOME, other story layouts, internal editorial modules, or reading copy. */
body[data-theme="signature"] #portrait-main .shell,
body[data-theme="signature"] #summary-main .shell,
body[data-theme="signature"] > .shell {
  box-sizing: border-box;
  width: 100%;
  max-width: none;
  margin-inline: 0;
  padding-inline: clamp(18px, 3vw, 42px);
}
/* Match the premium reading gutter on narrow screens; keep the chapter
   diagrams' own responsive breakpoints and readable text column limits. */
@media (max-width: 600px) {
  body[data-theme="signature"] #portrait-main .shell,
  body[data-theme="signature"] #summary-main .shell,
  body[data-theme="signature"] > .shell {
    padding-inline: 20px;
  }
}