卡通扁平化现代都市生活地铁列车高架轨道城市天际线场

illustration, minimalist cartoon style, light blue, orange, green color palette, bright and fresh, elevated subway, ground cars, underground train, buildings, trees, street lamps, modern urban scene, busy and orderly environment, simple lines and color blocks, clean background, no excessive details, modern and clean visual effect, conveying the convenience and efficiency of urban transportation