简约卡通扁平化风格城市夜景沿河建筑秋季宁静夜晚插画

illustration, retro minimalist style, main colors deep blue and warm yellow, contrasting color scheme, night city street scene, buildings along the street, evenly spaced street lamps, trees scattered throughout, peaceful and warm atmosphere, lighting effects, window shadows, starry night sky, simple building details, warm and serene visual effect