/* Only the unfolded Fold Calendar keeps its existing tab selector pinned.
 * Header height is measured; no other page or device changes its shell. */
html[data-pe-fold-wide="true"] body.lessonCalendarApp .pe87Side,
html[data-pe-fold-wide="true"] body.lessonCalendarApp .mobileTabBar {
  position: sticky !important;
  top: var(--pe-fold-calendar-nav-top, 68px) !important;
}