/** Read a `var(--token)` width in px using a hidden probe (works with calc() tokens). */
export declare function readCssVarWidthPx(context: HTMLElement, cssVarName: string): number;
export interface PanelNavWidthTokens {
    expandedPx: number;
    collapsedPx: number;
}
/** Resolve panel-nav expanded/collapsed widths from scoped CSS vars on `.panel-nav`. */
export declare function readPanelNavWidthTokens(navRoot: HTMLElement): PanelNavWidthTokens;
export declare function isPanelNavCollapsed(panelNavHost: HTMLElement | null, navRoot: HTMLElement | null): boolean;
export declare function panelWidthPxFromTokens(tokens: PanelNavWidthTokens, collapsed: boolean): number;
export declare function barGradientPositionFromPanelWidth(panelWidthPx: number): string;
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