/**
 * Image background. The image is tiled or scaled across the page with optional blur and dark tint overlay.
 */
export interface FormBackgroundImage {
    /** HTTPS URL of the background image. Must start with `https://`. */
    url: string;
    /** Darkening overlay intensity from 0 (no overlay) to 80 (heavy). Helps preserve text contrast over busy images. */
    tint_opacity: number;
    /** When true, blurs the background image. */
    blur: boolean;
    /** Scale percentage. 100 is native size; higher values crop the image tighter. */
    zoom: number;
}