accessible ramp 3d model

Create a simple technical 3D model of an accessible linear ramp, like a clean CAD architectural model. Show only geometric shapes: a flat lower floor, a small rectangular step of 0.08 meters height, and one straight rectangular ramp connecting the lower floor to the upper level. Ramp length: 1.59 meters. Ramp slope: 5.03 percent. The ramp must be straight, smooth, flat, and rectangular, with constant slope. Add small side curbs on both sides of the ramp. Use plain light gray concrete material. Isometric view. Clean background. No people, no wheelchair, no terrain, no organic shapes, no decorations, no text, no labels, no logos.