blue background tech light effects mystery color white hovering cars flowing on roads beside tech skyscrapers large borderless electronic projection

With a blue color scheme as the background, featuring a sense of technology and light and shadow effects, it exudes an aura of mystery. Numerous white floating cars are bustling on the roads, and towering beside them are many high-tech skyscrapers. In front of these skyscrapers are large, frameless electronic projection vertical screens displaying advertisements, designed in the golden ratio and with ultra-high definition 8K resolution.