export interface CenteredTitleDescriptionLayout {
    contentStartY: number;
    titleStartY: number;
    descStartY: number;
    titleHeight: number;
    descHeight: number;
    totalContentHeight: number;
    gap: number;
}
export declare function measureTextBlockHeight(lineCount: number, fontSize: number, lineHeight: number): number;
export declare function layoutCenteredTitleDescription(params: {
    height: number;
    titleLineCount: number;
    titleFontSize: number;
    titleLineHeight: number;
    descLineCount: number;
    descFontSize: number;
    descLineHeight: number;
    gap: number;
}): CenteredTitleDescriptionLayout;
export declare function createSvgStyleCdata(css: string): string;