/**
 * Resolves a color string to a valid CSS value for use in styles.
 * Supports Ionic color names, CSS variables, and custom colors.
 *
 * @param color The color name, CSS variable, or custom color string
 * @returns A valid CSS color value
 *
 * @example
 * resolveColor('primary'); // returns 'var(--ion-color-primary)'
 * resolveColor('--my-custom-color'); // returns 'var(--my-custom-color)'
 * resolveColor('#ff0000'); // returns '#ff0000'
 */
export declare function resolveColor(color: string): string;