/** CSS color parsing — hex, rgb(a), hsl(a), transparent, and common named colors. */
export type RgbaColor = {
    r: number;
    g: number;
    b: number;
    a: number;
};
/**
 * Parse a CSS color string into RGBA components.
 * Returns `null` when the format is not recognized.
 */
export declare function tryParseColor(color: string): RgbaColor | null;
/** Parse color; unknown values fall back to opaque black (legacy behavior). */
export declare function parseColor(color: string): RgbaColor;
/** Re-encode with a new alpha. Returns `null` if `color` cannot be parsed. */
export declare function colorWithAlpha(color: string, alpha: number): string | null;
/** Linear RGB mix; falls back to `to` if either side cannot be parsed. */
export declare function mixColors(from: string, to: string, t: number): string;
export declare function interpolateColor(from: string, to: string, t: number): string;
/** True when the string looks like a concrete CSS color (not a semantic token). */
export declare function isCssColorString(color: string): boolean;