地下通道与地铁站连接：标高整合与转换

Render the junction where a street underpass connects directly into a metro station's unpaid concourse. Show the passage arriving at a wide opening in the station wall, the two spaces at the same level so no step or ramp is needed at the threshold — the level integration being the point. Detail the material transition clearly: the underpass's pale tile giving way to the station's polished terrazzo and stainless, with a recessed movement joint expressed as a slim brass strip across the floor and up the walls. Show the station side opening into a taller concourse with the gate line visible ahead, ticket machines to one side, and station wayfinding suspended overhead. Detail the underpass side with its own signage anticipating the station, using the same graphic system so the transition reads as continuous. Show a security shutter housed in a ceiling pocket above the opening, visible as a slim slot, for closing the link outside operating hours. Include commuters flowing through in both directions. Photorealistic, bright, pale tile to terrazzo, eye-level view toward the station.