monkeytypegame/monkeytype ? reverse-engineered prompt

Build me a website for people to practice and improve their typing speed. The design should be really modern and minimalist, with a clean interface that removes distractions and helps the user focus. The main feature is a typing test where the user types text presented on screen. While they're typing, it should provide live feedback on their words-per-minute (WPM), accuracy, and any errors they make.

I want it to have an account system so users can sign up to save their results, track their history, and see their progress displayed on a chart. The site needs to be highly customizable. Users should be able to choose from different themes, select various test durations (like 15, 30, or 60 seconds), and practice different modes like quotes, or text that includes punctuation and numbers. The typing experience itself should feel really fluid and responsive, with a smooth caret.