/**
 * S-52 IHO standard color palette.
 *
 * Three display modes: DAY_BRIGHT, DUSK, NIGHT.
 * Color tokens map to specific meanings in chart display.
 */
export type DisplayMode = 'DAY_BRIGHT' | 'DUSK' | 'NIGHT';
export interface RGB {
    r: number;
    g: number;
    b: number;
}
/** S-52 named color tokens used throughout the Presentation Library */
export declare const COLOR_TOKENS: {
    readonly NODTA: "NODTA";
    readonly DEPVS: "DEPVS";
    readonly DEPIT: "DEPIT";
    readonly DEPMS: "DEPMS";
    readonly DEPMD: "DEPMD";
    readonly DEPDW: "DEPDW";
    readonly LANDA: "LANDA";
    readonly LANDF: "LANDF";
    readonly CHGRD: "CHGRD";
    readonly CHBLK: "CHBLK";
    readonly CHBRN: "CHBRN";
    readonly CHMGD: "CHMGD";
    readonly CHRED: "CHRED";
    readonly CHGRN: "CHGRN";
    readonly CHYLW: "CHYLW";
    readonly CSTLN: "CSTLN";
    readonly SNDG1: "SNDG1";
    readonly SNDG2: "SNDG2";
    readonly DEPSC: "DEPSC";
    readonly RESBL: "RESBL";
    readonly APTS: "APTS";
    readonly OUTLW: "OUTLW";
    readonly OUTLL: "OUTLL";
    readonly RADHI: "RADHI";
    readonly LITRD: "LITRD";
    readonly LITGN: "LITGN";
    readonly LITYW: "LITYW";
    readonly ISDNG: "ISDNG";
    readonly TRFCF: "TRFCF";
    readonly TRFCD: "TRFCD";
};
export type ColorToken = keyof typeof COLOR_TOKENS;
/** Resolve a color token to RGB for the given display mode. */
export declare function resolveColor(token: string, mode?: DisplayMode): RGB;
/** Convert RGB to CSS color string. */
export declare function rgbToCSS(rgb: RGB, alpha?: number): string;
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