/**
 * Accessibility preferences state. Each option maps to a data-attribute on
 * <html> (e.g. data-a11y-contrast="high"); the PROJECT's CSS reacts to those
 * attributes. The plugin sets the attributes and persists the choice — it does
 * NOT ship styles, so it never fights the project's design.
 */
export type A11yState = {
    /** Larger cursor. */
    bigCursor: boolean;
    /** 'default' | 'high' (high contrast) | 'inverted' (dark-on-light flip). */
    contrast: 'default' | 'high' | 'inverted';
    /** Grayscale filter on the whole page. */
    grayscale: boolean;
    /** Line spacing: 0 = default, 1..2 = looser. */
    lineHeight: 0 | 1 | 2;
    /** Readable font (project maps this to a dyslexia-friendly / simple font). */
    readableFont: boolean;
    /** Stop animations / transitions (prefers-reduced-motion equivalent). */
    reduceMotion: boolean;
    /** Text size step: 0 = default, 1..3 = larger. */
    textSize: 0 | 1 | 2 | 3;
    /** Underline all links (WCAG: don't rely on color alone). */
    underlineLinks: boolean;
};
export declare const A11Y_DEFAULT: A11yState;
export declare const A11Y_COOKIE = "a11y-prefs";
export declare const A11Y_COOKIE_MAX_AGE: number;
/** Serialize for the cookie (compact). */
export declare function serializeA11y(state: A11yState): string;
/** Parse from the cookie; falls back to defaults on any bad value. */
export declare function parseA11y(raw: null | string | undefined): A11yState;
/**
 * Maps state → data-attributes to set on <html>. Returns { attr: value|null };
 * null means remove the attribute (option is at default). The project's CSS
 * targets these, e.g. `[data-a11y-contrast="high"] { … }`.
 */
export declare function a11yAttributes(state: A11yState): Record<string, null | string>;