/**
 * Extracts CSS custom properties (variables) from a given CSS string
 * for .light-mode and .dark-mode selectors and returns an object
 * with 'light' and 'dark' keys containing the filtered variables.
 * Only variables matching hex color values (#RRGGBB or #RRGGBBAA) are accepted.
 *
 * @param css - The CSS string to parse.
 * @returns An object with `light` and `dark` properties containing the extracted CSS variables.
 */
export declare const loadCssVariables: (css: string) => Promise<{
    light: any;
    dark: any;
}>;
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