市场顶棚：摊位上方的连续高侧光屋面

Design a canopy for an open-air city market, shaped by the need to light produce without heating it. Show a long roof made of repeated sawtooth bays, each bay a sloping opaque plane paired with a vertical glazed face turned away from the sun, so all the daylight entering is indirect and no direct beam ever falls on the stalls below. Detail the sloping planes as insulated metal deck in a pale grey, and the glazed faces as clear glass in slim dark frames, the sawtooth profile reading strongly from the side as a row of steps against the sky. Show the structure as a light steel truss spanning the full market width with no internal columns, so stall layout below is completely free. Detail the soffit as pale perforated metal with the truss visible above it, and long simple pendant lamps hanging in a regular line. Show the quality of light as the subject: an even shadowless brightness across crates of fruit, awnings and moving shoppers. Set it in a dense city block with older buildings visible past the roof ends. Show mid-morning light. Photorealistic, bright and even, pale grey over saturated produce, eye-level view down the aisle.