/**
 * Spacing system and layout constants for the terminal UI design system.
 *
 * Provides a consistent spacing scale and layout primitives
 * for building terminal UIs with predictable rhythm.
 */
export interface SpacingScale {
    /** Extra small: 1 cell */
    readonly xs: number;
    /** Small: 2 cells */
    readonly sm: number;
    /** Medium: 3 cells */
    readonly md: number;
    /** Large: 4 cells */
    readonly lg: number;
    /** Extra large: 6 cells */
    readonly xl: number;
}
export declare const spacing: SpacingScale;
export type BorderStyle = "single" | "round" | "double" | "thick";
export interface BorderChars {
    readonly topLeft: string;
    readonly topRight: string;
    readonly bottomLeft: string;
    readonly bottomRight: string;
    readonly horizontal: string;
    readonly vertical: string;
    readonly cross: string;
    readonly tDown: string;
    readonly tUp: string;
    readonly tLeft: string;
    readonly tRight: string;
}
export declare function getBorderChars(style: BorderStyle): BorderChars;
export interface LayoutConstants {
    /** Default gutter width for aligned columns */
    readonly gutterWidth: number;
    /** Minimum terminal width to show full layout */
    readonly minTerminalWidth: number;
    /** Default panel padding */
    readonly panelPadding: number;
    /** Default border style */
    readonly defaultBorder: BorderStyle;
}
export declare const layout: LayoutConstants;
export type Breakpoint = "compact" | "narrow" | "wide";
export interface BreakpointConfig {
    readonly compact: number;
    readonly narrow: number;
}
export declare const breakpoints: BreakpointConfig;
/**
 * Determine the current breakpoint from terminal width.
 */
export declare function getBreakpoint(width: number): Breakpoint;
/**
 * Check if the current width matches a breakpoint.
 */
export declare function isBreakpoint(width: number, bp: Breakpoint): boolean;
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