Add Interactive Exercises (Drag-and-Drop, Fill-in-the-Blank, Matching)

[dbsectrainer]

Description

Enhance the learning experience by adding interactive exercise types beyond the current text-based lessons.

Features to Implement

• Drag-and-Drop Exercises: Allow users to drag words/phrases to correct positions
• Fill-in-the-Blank: Interactive text inputs for missing words in sentences
• Matching Games: Match words with translations or images

Technical Requirements

• Use vanilla JavaScript (maintain current tech stack)
• Ensure exercises work offline (static web app requirement)
• Store progress in localStorage
• Make exercises accessible (keyboard navigation, screen reader support)
• Responsive design for mobile and desktop

Acceptance Criteria

• Drag-and-drop exercise component implemented
• Fill-in-the-blank exercise component implemented
• Matching game exercise component implemented
• Exercise results stored in localStorage
• Exercises integrate with existing lesson structure
• All exercises are fully accessible
• Mobile-responsive design

Priority

High - Core feature for competitive language learning experience