/** Palette of the reviewed banner, shared by every density. */
export declare const BANNER_PALETTE: {
    readonly surface: "#343441";
    readonly pillSurface: "#2e2c3a";
    readonly caption: "#a1a1b3";
    readonly code: "#ffffff";
    readonly title: "#e7e7f0";
    readonly titleMuted: "#a1a1b3";
    readonly meta: "#bebecb";
    readonly purpose: "#c4ccd8";
};
export declare const HEX_COLOR: RegExp;
/**
 * The design pairs a saturated rule with a lighter tint of the same hue for
 * the pill text (#06b6d4 / #6edcee). Mixing toward white reproduces that
 * pairing from the one colour a host declares.
 */
export declare function lightenHex(hex: string, amount: number): string;