💸 Expense Tracker Web App

A responsive and user-friendly web application to track income and expenses with monthly summaries, dynamic transaction history, and dark mode support.

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🚀 Features

• ✅ Add Transactions with amount, category, and date
• 🧮 Real-Time Balance Updates for total income, expense, and savings
• 🗂 Category Dropdown: Track spending in Food, Travel, Rent, and more
• 📅 Date Picker: Log past or future-dated expenses accurately
• 📊 Monthly Summary: Toggle to view income, expense & savings per month
• 📉 Negative Month Highlight: Months with more expenses than income are marked clearly
• 📖 View History Toggle: Show last 3–4 transactions or full list
• 🌙 Dark Mode Toggle: Cleaner viewing at night with theme persistence
• 🧠 LocalStorage powered: Data remains across sessions
• 🔐 Login System (Basic): Simulated user-based data separation

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🧑‍💻 Tech Stack

• Frontend: HTML, CSS, JavaScript
• Storage: LocalStorage (Browser-based persistence)

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📂 Folder Structure

├── home.html            // Landing page
├── login.html           // Sign in / Login screen
├── index.html           // Main expense tracker
├── style.css            // Unified styling for all pages
├── script.js            // Logic for tracking & transactions
├── auth.js              // Login/sign-up handling

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💡 How to Use

1. Open home.html and click Sign In to Continue
2. Create a user (login.html)
3. Enter transactions in the form (index.html)
4. Use View Monthly Summary to analyze your spending
5. Toggle dark/light mode anytime