/** SheetNav root is `<footer class="desktop__sheetnav">`; cluster holds tabs + toolbar. */
export declare const SHEET_NAV_CLUSTER_SELECTOR = ".desktop__sheetnav .sheetnav-footer-cluster";
export type ActionSetLayoutBounds = {
    margin: number;
    innerHeight: number;
    /** Viewport Y of the top of SheetNav chrome, or null when SheetNav is absent. */
    sheetNavTop: number | null;
};
/** Maximum viewport Y for the bottom edge of the tile rail (above SheetNav). */
export declare function maxRailBottomY(bounds: ActionSetLayoutBounds): number;
export declare function maxTopForRailHeight(railHeight: number, bounds: ActionSetLayoutBounds): number;
export declare function clampTileTop(top: number, railHeight: number, bounds: ActionSetLayoutBounds): number;
export declare function isAtLowerVerticalLimit(top: number, railHeight: number, bounds: ActionSetLayoutBounds, epsilon?: number): boolean;
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