export interface GlassRgb {
    r: number;
    g: number;
    b: number;
}
export declare const normalizeHexColor: (input: string) => string;
export declare const hexToRgb: (input: string) => GlassRgb;
export declare const rgbToHex: ({ r, g, b }: GlassRgb) => string;
export declare const mixHex: (from: string, to: string, amount: number) => string;
export declare const relativeLuminance: (input: string) => number;
export declare const contrastRatio: (foreground: string, background: string) => number;
export declare const bestTextColor: (background: string, light?: string, // @ag-literal-allowed: color-math
dark?: string) => string;
export interface Oklch {
    l: number;
    c: number;
    h: number;
    alpha?: number;
}
export interface Srgb {
    r: number;
    g: number;
    b: number;
    alpha?: number;
}
/** Oklch -> sRGB channel floats 0..1 (may exceed gamut before mapping). */
export declare const oklchToSrgbRaw: (color: Oklch) => [number, number, number];
/** sRGB (0..1) -> Oklch. */
export declare const srgbToOklch: (input: Srgb | [number, number, number]) => Oklch;
/** CSS Color 4 gamut mapping: binary-search chroma reduction holding L,H.
 *  Guaranteed within dEOK < 0.02 of the CSS reference algorithm's result
 *  for the token/theme domain. */
export declare const oklchToSrgb: (color: Oklch) => Srgb & {
    inGamut: boolean;
};
/** Parse hex / rgb() / hsl() / oklch() into Oklch. */
export declare const parseColor: (input: string | Oklch) => Oklch;
/** WCAG 2.2 contrast ratio between two colors (any parseable input). */
export declare const wcagContrast: (a: string | Srgb | Oklch, b: string | Srgb | Oklch) => number;
/** source-over composite: fg (with alpha) over opaque bg, returning opaque sRGB. */
export declare const compositeOver: (fg: string | Srgb | Oklch, bg: string | Srgb | Oklch) => Srgb;
/** Advisory APCA Lc (W3 formula, polarity-aware). Positive = dark text on light bg. */
export declare const apcaLc: (text: string | Srgb | Oklch, background: string | Srgb | Oklch) => number;
/** Serialize Oklch as a CSS color string. Lives here because `oklch(` literals
 *  are only allowed in this file (MAT-056 line allowance). */
export declare const formatOklch: (o: Oklch) => string;
/** Serialize a light/dark pair as `light-dark(<light>, <dark>)`. */
export declare const formatLightDark: (light: string, dark: string) => string;
/** @supports query probing relative-color syntax (oklch(from ...) support). */
export declare const RELATIVE_OKLCH_QUERY = "color: oklch(from red l c h)";
/** CIEDE2000 colour difference. */
export declare const deltaE2000: (a: string | Srgb | Oklch, b: string | Srgb | Oklch) => number;
//# sourceMappingURL=color.d.ts.map