/**
 * Z-Index System - Semantic Layering
 *
 * Mies: "God is in the details"
 * Systematic layering prevents z-index chaos.
 *
 * @see /STANDARDS.md - Section 1.5 Z-Index System
 */
export declare const zIndex: {
    readonly base: 0;
    readonly dropdown: 10;
    readonly sticky: 20;
    readonly fixed: 50;
    readonly modal: 100;
    readonly popover: 200;
    readonly tooltip: 300;
};
export type ZIndexKey = keyof typeof zIndex;
/**
 * Get z-index value by key
 */
export declare function getZIndex(key: ZIndexKey): number;
/**
 * CSS custom property names for z-index
 */
export declare const zIndexVars: {
    readonly base: "--z-base";
    readonly dropdown: "--z-dropdown";
    readonly sticky: "--z-sticky";
    readonly fixed: "--z-fixed";
    readonly modal: "--z-modal";
    readonly popover: "--z-popover";
    readonly tooltip: "--z-tooltip";
};
/**
 * Generate CSS custom properties string
 */
export declare function generateZIndexCSS(): string;