管状封闭天桥：有顶有壁的全天候通道

Show a fully enclosed pedestrian bridge crossing a wide road, designed for use in heavy rain and strong sun. Render the span as a continuous tube of curved steel ribs at regular centres, clad in translucent polycarbonate panels on the sides and roof with a band of clear glazing at eye level, so the interior is bright and diffusely lit while the view out at seated and standing height stays clear. Detail the ribs as slim curved sections painted pale grey, visible from both inside and out as a repeating structural rhythm. Show ventilation handled by a continuous louvred opening running along both sides just above the deck and again at the ridge, so air moves through without rain entering. Detail the deck as a smooth epoxy floor with a tactile guidance strip and a slight fall to concealed drainage at the ends. Include recessed linear lighting in the ribs. Show the exterior in evening with the tube glowing softly from within, reading as a lit ribbon over the dark traffic. Photorealistic, luminous, pale and translucent, three-quarter view from the street.