devenkhatri/qr-video-portal ? reverse-engineered prompt

Build me a mobile first web app for sharing unlisted educational YouTube videos through QR codes.

When someone opens a link like /watch?video=some-slug, show the video on a clean dark medical style page, but make first time viewers fill out a short form with name, gender, phone, region, and profession before they can watch. After they submit once, remember them in the browser so they do not have to do it again. Use a private YouTube embed and make it feel good on phones, especially in QR scanner browsers and apps like WhatsApp and Instagram.

I also want an admin area at /admin that is password protected and shows simple analytics, like total registrations, total views, views per video, gender breakdown, and recent activity. Store registrations and view events in Google Sheets if the credentials are available, but let the app run in demo mode locally if not.

Please set it up so I can add new videos easily by editing a data file, and include sensible sample content so I can test everything right away.