A vertical city nightscape illustration showing a cutaway grid of a high-rise building, with dozens of colorful rooms where people work at desks or relax together. In the background is a pink-purple gradient night sky with a crescent moon, distant skyscrapers glowing with lights, and a river and lush trees beside the building. Warm yellow and candy-colored interior lights blend together, creating a busy yet cozy urban life atmosphere, all in a flat, delicate digital illustration style.