天桥的清晨与夜晚：同一座桥的两种氛围

Render an urban pedestrian overpass at dawn, when the city around it is still and the structure is legible for once. Show the bridge crossing an almost empty road, its slim deck and slender piers reading clearly against a pale sky with the first light catching the top of the parapet rail. Detail the surroundings as still asleep — shopfront shutters down, a single delivery scooter, a street sweeper working the kerb, traffic lights cycling for no one. Show the bridge's own lighting still on but no longer needed, its linear handrail light faint against the growing daylight. Detail the deck with a lone jogger crossing and a person walking a dog, both small in the frame so the structure dominates. Show the mist of early morning softening the middle distance and the buildings beyond fading into pale grey. Detail the surfaces damp with dew, the deck reflecting the sky faintly. Keep the palette cool blue-grey with a warm horizontal band of first sun along one edge. Photorealistic, quiet, cool with a warm accent, low three-quarter view from the street.