/**
 * Shared CSS color parsing — hex, rgb()/rgba(), hsl()/hsla(), and oklch().
 *
 * shadcn + Tailwind v4 design systems express tokens as oklch()/hsl(),
 * not hex. Every contrast/audit path must parse these formats or it
 * silently checks nothing on modern token sets.
 */
export interface RgbColor {
    r: number;
    g: number;
    b: number;
}
/** Parse any supported CSS color to sRGB. Returns null when unparseable. */
export declare function parseCssColorToRgb(input: string): RgbColor | null;