strictly preserve the original geometry do not modify redesign add remove or reposition any architectural elements maintain the exact staircase configuration number of steps dimensions proportions angles landings walls openings ceiling heights door and window locations shown in the reference model staircase modern floating staircase with solid cantilevered rectangular treads maintain the exact stepped zigzag profile and original structure no glass railing or handrail add discreet warm led strip lighting underneath each individual tread creating a soft indirect glow materials and finishes stairs warm ivory or light beige stone matte finish walls smooth warm off white microcement or fine plaster floor large format beige porcelain tiles with subtle natural stone texture door underneath the staircase natural walnut wood veneer flush minimalist design providing access to the exterior window frames slim matte black aluminum lighting and atmosphere warm architectural lighting 3000k soft natural daylight entering through the existing windows realistic shadows and subtle light reflections balanced exposure warm neutral color palette and elegant atmosphere render quality ultra photorealistic architectural visualization professional interior photography realistic pbr materials global illumination ray tracing ambient occlusion high resolution textures realistic reflections soft shadows 4k quality
