/**
 * rgui core — themes. Every chrome color the renderers use lives in one
 * RgTheme object, so hosts can pass "dark" | "light" | any custom palette
 * (and swap live via viewer.setTheme). The built-in pair keeps the mascot
 * identity in both modes: field arrows stay purple (⊙ toward the viewer)
 * and gold (⊗ away) — the Royal Gramma crossover — tuned per background.
 *
 * Data colors (per-kind wire colors, node.bg overrides) are host data, not
 * theme chrome, and are unaffected.
 */
export interface RgTheme {
    /** canvas clear color (ignored when the host renders background: false) */
    background: string;
    /** field arrows pointing at the viewer — ⊙, the mascot purple */
    arrowToward: string;
    /** field arrows pointing into the screen — ⊗, the mascot gold */
    arrowAway: string;
    /** outline ink: node borders, port strokes, solder joints, indicators */
    ink: string;
    /** default node body fill (node.bg overrides per node) */
    nodeBg: string;
    /** chip painted behind edge labels so wire text reads over anything */
    labelBg: string;
    /** drop shadow under screen-constant pseudo-nodes */
    shadow: string;
    /** primary text (field values, node titles) */
    text: string;
    /** secondary text (summary lines, panel titles) */
    textDim: string;
    /** muted text (field keys, unpinned glyphs) */
    textMuted: string;
    /** faintest text (hints, empty states) */
    textFaint: string;
    /** highlight: selection box, hover borders, pinned stars */
    accent: string;
    /** invalid state (e.g. incompatible connection target) */
    danger: string;
    /** merged pseudo-node header fill */
    pseudoHeader: string;
    /** panel chrome */
    panelBg: string;
    panelBorder: string;
    panelHeaderBg: string;
}
export declare const DARK_THEME: RgTheme;
/**
 * Light mode: warm paper (suits the gold half of the mascot pair); the
 * purple/gold arrows deepen so they keep contrast on a bright field.
 */
export declare const LIGHT_THEME: RgTheme;
/**
 * Theme input: a built-in name, or a partial palette over a base
 * ({ base: "light", accent: "#e91e63" } — omitted base = dark).
 */
export type RgThemeInput = "dark" | "light" | (Partial<RgTheme> & {
    base?: "dark" | "light";
});
/** Resolve input to a fresh mutable RgTheme (safe to Object.assign later). */
export declare function resolveTheme(input?: RgThemeInput): RgTheme;
/** Parse "#rgb" / "#rrggbb" / "rgb(a)(…)" into [r, g, b] 0–255. */
export declare function themeRgb(color: string): [number, number, number];
/** color with an explicit alpha, e.g. withAlpha(theme.accent, 0.08) */
export declare function withAlpha(color: string, alpha: number): string;
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