Inside an elevator accelerating vertically upward with constant acceleration \(a_0\), a small block of mass \(m\) rests on a wedge whose inclined surface makes an angle \(\theta\) with the horizontal floor, where \(\tan\theta < \dfrac{1}{\mu_s}\). The coefficient of static friction between the block and the wedge face is \(\mu_s\). The wedge is accelerated horizontally to the right across the elevator floor such that the inclined surface pushes the block to the right, tending to cause the block to slide up the incline. What is the maximum horizontal acceleration \(a_{\text{max}}\) of the wedge for which the block does not slide up the incline?