Create a vibrant isometric illustration of a bustling cityscape at dawn, enveloped in a soft, ethereal fog. The scene should feature a mix of modern skyscrapers and quaint buildings, their colors muted by the fog yet still vibrant enough to convey life. The foreground should include detailed elements like trees and street lamps, partially obscured by the fog, while the background fades into a skyline that disappears into the mist. The lighting should be soft and diffused, creating a tranquil atmosphere, with subtle gradients enhancing the fog's mystical quality. Incorporate silhouettes of people walking along the streets to add a sense of scale and liveliness to the scene.