/**
 * WHICH SURFACE a heading is standing on — the one fact the fixed heading ramp
 * needs, answered by the CONTAINER rather than the call site.
 *
 * `page` — the flat canvas. A `#` identity band (`PageHeader`, `RecordSummary`)
 * tops the outline, so a section title is the `##` below it.
 *
 * `panel` — a self-contained pane whose own chrome title caps at `lg`, or which
 * has no title at all: a `Dialog`, `Drawer` or `Popover` body, and equally a
 * side panel docked beside a page.
 */
export type HeadingSurface = "page" | "panel";
/**
 * Published by the CONTENT REGIONS — `DrawerScrollArea`, `DialogScrollArea`,
 * `PopoverContent` — and NOT by `Drawer` or `Dialog` themselves, because an
 * overlay is used two ways: as a PANEL, which steps down, and as a FRAME around
 * a whole page surface that brings its own `#` identity band and must not. The
 * content regions already distinguish those two by who owns the gutter.
 *
 * **A host that builds its own pane publishes it directly** — wrap the pane's
 * content in `<HeadingSurfaceContext.Provider value="panel">`.
 *
 * The value is FLAT, never a depth counter: a popover opened from inside a
 * drawer is still one rung down, not two.
 */
export declare const HeadingSurfaceContext: import("react").Context<HeadingSurface>;
/** The surface this heading is standing on. `page` unless a pane says otherwise. */
export declare function useHeadingSurface(): HeadingSurface;