/** Primary hub scrollport — set on `PrimaryPageTemplate` body wrapper in apps/web. */
declare const PAGE_SCROLL_ATTR = "data-page-scroll";
/** Breadcrumb / site chrome — bottom edge is the table sticky-header pin line. */
declare const SITE_HEADER_ATTR = "data-site-header";
/** Compact / comfort utility bar — sits above `[data-page-scroll]`. */
declare const UTILITY_BAR_SLOT = "utility-bar";
/**
 * Sticky subheaders inside the page scrollport (under the utility bar).
 * Layer stack while scrolling a hub/detail: utility (outside) → these (z-40)
 * → floating table head (portaled, z-50). Must sit above DataTable pinned
 * cells (z-20) so row content cannot paint through tab labels.
 */
declare const STICKY_SUBHEADER_SLOTS: readonly ["tabs-sticky-subheader", "list-views-sticky-subheader"];
/**
 * The element that vertically scrolls hub page content (not `window`).
 * Falls back to `#main-content` for legacy shells.
 */
declare function getPageScrollElement(): HTMLElement | null;
/**
 * Viewport Y of the bottom of shell chrome that body-portaled floating
 * windows must stay below (utility bar, optional system banner).
 *
 * Prefers the live top of `[data-page-scroll]` when that canvas has already
 * cleared the bar. Falls back to the bar's own bottom, then 0 when the
 * shell has no bar (exam lock / focus workflows).
 */
declare function getShellChromeBottomPx(): number;
/**
 * Viewport Y where floating table column headers should pin.
 *
 * Prefers live geometry:
 * 1. Top of `[data-page-scroll]` (canvas under the utility bar)
 * 2. Bottom of a real `SiteHeader` when it is stuck in the top pin band
 * 3. Bottom of sticky subheaders (module tabs / hub view toolbar) stacked
 *    under that band — matched against the running offset, not only
 *    `portTop`, so a strip with margin/`top` offset still counts
 * 4. `--header-height` as last resort
 *
 * Ignores zero-height `data-site-header` shells (Compact portals the trail
 * into the utility bar and leaves an empty wrapper that must not affect pin).
 */
declare function getStickyTableHeaderOffset(): number;
/** Subscribe to vertical scroll sources that move tables relative to the viewport. */
declare function bindVerticalScrollListeners(onScroll: () => void): () => void;

export { PAGE_SCROLL_ATTR, SITE_HEADER_ATTR, STICKY_SUBHEADER_SLOTS, UTILITY_BAR_SLOT, bindVerticalScrollListeners, getPageScrollElement, getShellChromeBottomPx, getStickyTableHeaderOffset };