I made a small site to make shadowing YouTube videos easier

I practice English by shadowing YouTube videos, and I kept dragging the timeline back to repeat a sentence. So I built a site that plays one sentence at a time, pauses for you to repeat, and shows which words came through clearly. Try it with a John Wick 3 clip: shadow-ez.com/s Built with Vue and Cloudflare Workers (Whisper for speech). Free, no sign up. Still early, so any feedback is welcome, especially where it felt confusing.