Karthik-02/plagiarism-detection ? reverse-engineered prompt

Build me a simple plagiarism detector web app that lets me paste in text or upload documents like PDF and Word files, then compares the content and shows how similar the documents are. I want it to clean up the text, break it into tokens, calculate similarity, and clearly point out possible matches or copied sections. Please make it easy for a non technical person to use, with a nice Streamlit interface, a light and dark mode toggle, fullscreen support, and clean results that are easy to read.

It would be great if the app can also scrape a webpage when I give it a link, then compare that page against the text I provide. Show the results with simple charts or visual summaries so I can quickly see which files are most similar. If anything is unclear, look up the current docs online and make sensible choices.