I'll create a language learning web application with lessons and different activities. Each activity will have two tabs: one for voice recording where users can get feedback, and another for writing exercises based on audio clips.

I've created a language learning platform with the following features:

1. Home Page: Shows featured lessons and explains how the platform works.
2. Lessons Page: Displays all available lessons with filtering by level and sorting options.
3. Lesson Detail Page: Shows information about a specific lesson and lists all its activities.

4. Activity Page: This is the core of the application with two tabs:

   • Voice Recording Tab: Users can record their voice while practicing speaking exercises. The recording is saved and can be replayed, re-recorded, or submitted for feedback.
   • Writing Exercise Tab: Users can listen to audio and write what they hear, then submit it for feedback.
5. Community Feedback: Both tabs show feedback from other users who have reviewed the learner's submissions.

The platform is fully responsive and uses a clean, educational interface. To use it:

1. Browse and select a lesson from the lessons page
2. Choose an activity within the lesson
3. Practice with either the voice recording or writing exercise
4. Submit your work for community feedback
5. Track your progress through the lessons

You can add more lessons and activities by expanding the data structures in the respective files. The audio recording functionality uses the browser's MediaRecorder API to capture voice input.