Build an underground solarpunk + cyberpunk city carved into ...

Build an underground solarpunk + cyberpunk city carved into a massive cavern system. The city must be dense, multi-story, and extremely vertical with 6–8 stacked layers of streets, mezzanines, hanging walkways, rooftop platforms, ceiling-cling districts, and service tunnels. The atmosphere should feel cramped, hot, humid, and dark, with heavy steam, warm industrial glow, deep shadows, and occasional blackout pockets lit by emergency lights, but it must still look beautiful, stylish, and fun to explore.