sanidhyy/duolingo-clone — reverse-engineered prompt

Build me a polished Duolingo style language learning web app called Lingo. I want users to sign in, pick lessons, answer interactive challenges, lose hearts when they make mistakes, earn progress, and see quests, a shop, and their current streak or learning status in a fun modern dashboard.

Make it feel bright, playful, and mobile friendly, with a clean marketing page for logged out visitors and a full learning area after login. Include modals for running out of hearts, leaving a lesson, and practicing again. Add an admin area so I can manage course or challenge content, and seed the database with sample lesson data so the app works right away.

Use the stack from this repo, Next.js, React, TypeScript, Tailwind, Postgres with Drizzle, Clerk for auth, and Stripe for subscriptions. Please wire up the needed environment variables, database setup, and local run commands. Look up current docs online if you need to.