/**
 * Centralized layout/typography constants.
 *
 * Each visual element used to inline its own `Math.max(cellSize * X, Y) * scale`
 * formula. The factors were close but not identical, and a tweak in one
 * place silently shifted relative balance vs. the others. Routing every
 * font-size and inset through this module keeps the relationships explicit.
 */
import type { GridLayout } from './grid.js';
/** Highlight color for layout errors (label collision, failed routing). */
export declare const ERROR_COLOR = "#e02020";
/**
 * Per-element font-size factors. The `min` value is the absolute pixel
 * floor used at very small canvas sizes.
 */
export declare const FONT: {
    readonly node: {
        readonly factor: 0.065;
        readonly min: 12;
    };
    readonly connector: {
        readonly factor: 0.058;
        readonly min: 10;
    };
    readonly region: {
        readonly factor: 0.06;
        readonly min: 11;
    };
    readonly note: {
        readonly factor: 0.055;
        readonly min: 10;
    };
};
export type FontKind = keyof typeof FONT;
/** Resolve a font size for an element, applying its `labelScale` override. */
export declare function fontSize(layout: GridLayout, kind: FontKind, scale?: number): number;
/** Visible gap between adjacent regions, scaled to cell size. */
export declare function regionInset(layout: GridLayout): number;
/** Default region corner radius when not overridden by `RegionDef.borderRadius`. */
export declare function regionDefaultRadius(layout: GridLayout): number;
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