ccc #25984

Type: Bug

You are a senior front-end engineer, UI/UX designer, and mathematics education expert for CDC Nepal Grade 8 curriculum.

Your task is to build a COMPLETE, PROFESSIONAL, OFFLINE-READY interactive HTML5 learning application.

TOPIC:
Mathematics - Grade 8
Lesson: Ratio and Proportion (CDC Nepal)

🚨 CRITICAL OUTPUT RULES

1. Output ONLY code (no explanation, no comments outside code)
2. Must be a SINGLE fully working HTML file
3. Must start with:
4. Must end with:
5. No external libraries
6. No CDN links
7. Must work completely offline
8. Must be mobile + desktop responsive
9. Must be production-level UI (modern app style)

If output is too large, split automatically:

PART 1: HTML + CSS + UI Layout
PART 2: Core JavaScript + Interactions
PART 3: Quiz, Teacher Mode, Solver, Certificate, Sound System

Each part MUST:

• Continue seamlessly from previous part
• Not repeat code unnecessarily
• Be fully consistent

At the end of PART 3, ensure final merged result forms ONE complete working HTML file.

🎨 UI/UX REQUIREMENTS

• Modern educational app design
• Gradient background
• Glassmorphism cards
• Smooth animations
• Hover + click effects
• Progress bar
• Icons and badges
• Attractive typography
• Student-friendly visuals

📚 STRUCTURE (MUST INCLUDE ALL)

1. HEADER

• Title: Ratio and Proportion
• Grade 8 Mathematics
• CDC Nepal
• Start button + animated intro

2. INTRODUCTION

• Meaning
• Importance
• Real-life uses in Nepal
• Key terms

3. CONCEPT VISUALIZATION

• Interactive ratio models
• Clickable objects
• Simple animations

4. FORMULAS

• Ratio
• Proportion
• Cross multiplication
• Show/Hide toggle

5. STEP-BY-STEP LEARNING

• Next/Previous navigation
• Progressive teaching flow

6. REAL-LIFE EXAMPLES (5+)

• Nepal context
• Market, school, sports, home

7. WORKED EXAMPLES (10)

• Step-by-step solution reveal button

8. PRACTICE SECTION

• Input answer box
• Instant feedback
• Hint system

9. STEP SOLVER

• User enters question
• System shows stepwise solution

10. EXERCISES (20+)

• MCQ + short + long + HOTS

11. QUIZ SYSTEM

• 15–20 questions
• Random order
• Timer + scoring

12. SCOREBOARD

• Score, percentage, grade, stars

13. TEACHER MODE

• Highlight tool
• Pen tool
• Laser pointer
• Dark mode toggle
• Full screen

14. SOUND SYSTEM

• Click, correct, wrong sounds (offline generated via JS)

15. ACCESSIBILITY

• Large text mode
• High contrast mode
• Keyboard navigation

16. FINAL SUMMARY

• Key points
• Formula summary
• Exam tips

17. CERTIFICATE SCREEN

• Score based certificate
• Restart button

⚡ IMPORTANT ENGINEERING RULES

• Use clean modular JavaScript
• Use event-driven architecture
• No broken functions allowed
• No placeholder text like "TODO"
• Everything must be fully implemented
• All buttons must work
• All features must be functional

🎯 FINAL INSTRUCTION

Generate PART 1 now only.

Wait for my message:
"NEXT PART"

before continuing.

Do not skip steps.
Do not summarize.
Do not explain.

ONLY output working code.

Extension version: 2026.4.0
VS Code version: Code 1.122.1 (8761a5560cfd65fdd19ce7e2bd18dab5c0a4d84e, 2026-05-29T09:25:37+02:00)
OS version: Windows_NT x64 10.0.26200
Modes:

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