import { RendererStyles } from './renderer';
import { FixedPageVisualAppearance } from './fixed-document';
export type BuiltInReaderThemeName = 'normal' | 'night';
export interface ReaderTheme {
    /** Stable theme id. */
    id?: string;
    /** Display name for UI surfaces. */
    label?: string;
    /** Main reading text color. */
    color?: string;
    /** Viewport/background color around content. */
    background?: string;
    /** Page-like surface background, useful for fixed pages or card-like readers. */
    pageBackground?: string;
    /** Page-like surface shadow. Use "none" for flat themes. */
    pageShadow?: string;
    /** Visual appearance applied by fixed-page renderers that support direct theming. */
    fixedPageVisualAppearance?: FixedPageVisualAppearance;
    /** Optional link/accent color for renderers that support it. */
    accentColor?: string;
    /** Optional selection background for renderers that inject CSS. */
    selectionBackground?: string;
    /** Optional selection text color for renderers that inject CSS. */
    selectionColor?: string;
    /** Optional renderer CSS appended before user CSS. */
    css?: string;
}
export type ReaderThemeInput = BuiltInReaderThemeName | ReaderTheme;
export declare const BUILT_IN_READER_THEMES: Record<BuiltInReaderThemeName, Required<Pick<ReaderTheme, 'id' | 'label' | 'color' | 'background' | 'pageBackground' | 'pageShadow' | 'accentColor' | 'selectionBackground' | 'selectionColor'>> & Pick<ReaderTheme, 'fixedPageVisualAppearance'>>;
export declare function resolveReaderTheme(theme: ReaderThemeInput | null | undefined): ReaderTheme | null;
export declare function resolveRendererStyles(styles?: RendererStyles): RendererStyles;
export declare function mergeRendererStyles(current: RendererStyles, patch: RendererStyles): RendererStyles;
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