/* Native modal state covers dynamic/stacked dialogs and all close paths. */
html { scrollbar-gutter: stable; }
html:has(dialog:modal), body:has(dialog:modal) {
  overflow: hidden !important;
  overscroll-behavior: none;
}
/* Keep scrolling inside the modal, including at its top/bottom boundary. */
dialog:modal { overscroll-behavior: contain; }