fastfetch-cli/fastfetch ? reverse-engineered prompt

I want a tool I can run from the command line that quickly shows me detailed information about my system in a nice, visually appealing format, sort of like neofetch. It should work on Linux, macOS, Windows, and major BSDs, and support a lot of different hardware and software info modules. The output should be customizable, like being able to pick which details are shown or use different logos or styles. I’d like config files to tweak how things look and maybe easily share or reuse setups. Make it fast, easy to install, and reliable on recent operating systems. Show me helpful examples and make sure I can look up any unclear parts in the docs online if needed.