/**
 * Retrieves the computed value of a NUI CSS theme variable from the document.
 * @param category The theme category (e.g. 'color', 'bg', 'text')
 * @param key The specific token key (e.g. 'primary', 'default')
 * @param fallback Optional fallback value if the variable isn't found
 * @returns The resolved CSS value (e.g. '#2563eb')
 */
export declare function getThemeValue(category: string, key: string, fallback?: string): string;
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