export interface GaitTuning {
    /** Stride cycles per world unit travelled — ties step cadence to actual speed. */
    stridesPerUnit: number;
    bobAmplitude: number;
    swayAmplitude: number;
    /** Speed at which bob/sway reach full intensity. */
    fullIntensitySpeed: number;
}
export declare const DEFAULT_GAIT_TUNING: GaitTuning;
export declare function advanceGaitPhase(phase: number, speedUnitsPerSec: number, dtSec: number, tuning?: GaitTuning): number;
/** Vertical hop per footfall — two peaks per stride cycle. */
export declare function gaitBobOffset(phase: number, speedUnitsPerSec: number, tuning?: GaitTuning): number;
/** Signed side-to-side lean alternating with each footfall. */
export declare function gaitSwayAngle(phase: number, speedUnitsPerSec: number, tuning?: GaitTuning): number;