Design an isometric illustration of a cityscape at night, enveloped in a thick layer of fog that adds an air of mystery. The scene should showcase a variety of architectural styles, from modern high-rises to vintage buildings, all illuminated by warm, inviting lights that pierce through the fog. The foreground should include street elements like cars and pedestrians, their shapes softened by the mist, while the background features a skyline that gradually fades into the darkness. The lighting should create a high contrast between the illuminated areas and the fog, enhancing the depth and intrigue of the scene. Incorporate subtle post-production effects like color grading to emphasize the warm tones of the lights against the cool, muted colors of the fog, creating a captivating urban nightscape that draws the viewer in.