石の層と一本のトップライト：山中の温泉浴場

Monolithic bathing pavilion partially embedded into a mountain slope, orthogonal geometry of stacked stone slabs, load-bearing masonry of thin local quartzite layers, one dominant material with no secondary finishes, narrow vertical slits and a single rectangular sky aperture, compressed dark corridor opening into a steaming water hall, architecture emerging from terrain, single shaft of daylight across still water, gradual shadow transition, eye-level composition, 35mm architectural lens, ultra photorealistic, museum-quality visualization, 8K