/**
 * Short overlay enter/exit motion (Dialog / BottomSheet / Toast).
 * Tokens from shared theme.css; fallbacks match Spec defaults when unset.
 */
export declare const OVERLAY_MOTION_TRANSITION = "transition-[opacity,transform] duration-[var(--motion-duration-base,150ms)] ease-[var(--motion-easing-standard,ease)] motion-reduce:transition-none";
/** Settled (visible) panel/toast surface. */
export declare const OVERLAY_MOTION_ENTERED = "opacity-100 translate-y-0 scale-100";
/** Pre-enter / exiting panel (brief opacity + transform). */
export declare const OVERLAY_MOTION_EXITED = "opacity-0 translate-y-1 scale-[0.98]";
/** Backdrop fade only. */
export declare const OVERLAY_BACKDROP_ENTERED = "opacity-100";
export declare const OVERLAY_BACKDROP_EXITED = "opacity-0";
/** Exit delay covers --motion-duration-base (200ms in theme) + small buffer. */
export declare const OVERLAY_EXIT_MS = 220;
export declare function prefersReducedMotion(): boolean;
export interface OverlayPresence {
    /** Keep in DOM while enter/exit runs. */
    readonly mounted: boolean;
    /** True after enter frame / false while exiting. */
    readonly visible: boolean;
}
/**
 * Mount-gated presence for controlled overlays (`open`).
 * Open mounts synchronously; exit holds DOM for OVERLAY_EXIT_MS (skipped when reduce).
 */
export declare function useOverlayPresence(open: boolean): OverlayPresence;
/**
 * One-shot enter for presentational surfaces that mount when shown
 * (prefer `useOverlayPresence` when exit hold is needed, e.g. Toast `open`).
 */
export declare function useEnterMotion(): boolean;
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