/** Per-badge background-position for shell gradient ring sampling. */
export declare const BADGE_GRADIENT_POSITION_VAR = "--_badge-gradient-position";
export interface GradientSurface {
    element: HTMLElement;
    chromeHost: HTMLElement;
    positionVar: string;
}
/** Whether the badge sits under a shell with an active wash preset. */
export declare function isShellGradientActive(from: HTMLElement): boolean;
/** Bar or panel chrome surface that owns the shell gradient stack. */
export declare function findGradientSurface(from: HTMLElement): GradientSurface | null;
interface ParsedPosition {
    x: number;
    y: number;
}
/** Parse a two-value CSS background-position (e.g. `-200px 0`). */
export declare function parseCssBackgroundPosition(value: string): ParsedPosition;
/**
 * Background position for a badge ring so the shell gradient aligns with nav chrome.
 * Uses badge center relative to the painted chrome surface.
 */
export declare function badgeGradientPosition(badgeHost: HTMLElement, surface: GradientSurface, shellPosition: string): string;
/** Resolve shell gradient position from chrome host custom properties. */
export declare function readShellGradientPosition(surface: GradientSurface): string;
/** Stamp `--_badge-gradient-position` on the badge host (fixed viewport chrome). */
export declare function syncBadgeGradientPosition(badgeHost: HTMLElement): void;
export {};
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