/**
 * Cross-surface responsive breakpoint SSOT (Tailwind v4 Option A defaults).
 * wide (1440) is test-viewport only — see TEST_VIEWPORTS.wide, not BREAKPOINTS.
 */
export declare const RESPONSIVE_CONTRACT_VERSION = "1.0.0";
export declare const BREAKPOINTS: {
    readonly sm: 640;
    readonly md: 768;
    readonly lg: 1024;
    readonly xl: 1280;
    readonly '2xl': 1536;
};
export type BreakpointToken = keyof typeof BREAKPOINTS;
/** Semantic density tiers — not 1:1 with Tailwind tokens. */
export declare const RESPONSIVE_TIER_BOUNDS: {
    readonly compact: {
        readonly maxWidth: number;
    };
    readonly comfortable: {
        readonly minWidth: 768;
        readonly maxWidth: number;
    };
    readonly expanded: {
        readonly minWidth: 1024;
    };
};
/** Alias for RESPONSIVE_TIER_BOUNDS — preferred import name in shell code. */
export declare const RESPONSIVE_TIERS: {
    readonly compact: {
        readonly maxWidth: number;
    };
    readonly comfortable: {
        readonly minWidth: 768;
        readonly maxWidth: number;
    };
    readonly expanded: {
        readonly minWidth: 1024;
    };
};
export type ResponsiveTier = keyof typeof RESPONSIVE_TIER_BOUNDS;
/** Playwright / acceptance matrix viewports (wide is PO mockup tier only). */
export declare const TEST_VIEWPORTS: {
    readonly phoneSmall: {
        readonly width: 320;
        readonly height: 568;
    };
    readonly phone: {
        readonly width: 390;
        readonly height: 844;
    };
    readonly phoneLandscape: {
        readonly width: 844;
        readonly height: 390;
    };
    readonly tablet: {
        readonly width: 768;
        readonly height: 1024;
    };
    readonly tabletLandscape: {
        readonly width: 1024;
        readonly height: 768;
    };
    readonly desktop: {
        readonly width: 1280;
        readonly height: 900;
    };
    readonly wide: {
        readonly width: 1440;
        readonly height: 900;
    };
};
export declare function tierFromWidth(widthPx: number): ResponsiveTier;
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