简约3D渲染灰色白色渐变层次感方形块体堆叠阶梯结构

3D rendered illustration, main color scheme in gray and white, clean and simple. Three layers of different material boards: top layer is smooth metal square plate, middle layer is fine-textured board, bottom layer is grid-structured transparent or semi-transparent plate. Parallel arrangement, floating in the air. Pure white background, no decorative elements. Modern and technological visual effect, emphasizing material texture and layers.