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        <header>
            <h1>🧮 Java Basic Math Tools</h1>
            <p>Comprehensive Mathematical Suite with 15 Powerful Tools</p>
        </header>

        <div class="section">
            <h2>📋 Project Overview</h2>
            <p><strong>Java Basic Math Tools</strong> is a comprehensive, all-in-one mathematical and utility suite built with Java Swing. This application features 15 powerful tools wrapped in a professional, high-contrast dark theme with vibrant red accents. The project was developed in 2026 by Molla Samser and designed by Rima Khatun.</p>

            <div class="feature-list">
                <div class="feature-item">
                    <strong>🎨 Professional UI:</strong> Dark theme with red accents inspired by rskworld.in
                </div>
                <div class="feature-item">
                    <strong>⚡ Performance:</strong> Optimized UI engine for lag-free interaction
                </div>
                <div class="feature-item">
                    <strong>🛠️ 15 Tools:</strong> Complete mathematical toolkit
                </div>
                <div class="feature-item">
                    <strong>⌨️ Shortcuts:</strong> Keyboard navigation support
                </div>
                <div class="feature-item">
                    <strong>📚 History:</strong> Track all calculations
                </div>
                <div class="feature-item">
                    <strong>🔄 Cross-Platform:</strong> Java-based, runs anywhere
                </div>
            </div>
        </div>

        <div class="section">
            <h2>🚀 Quick Start Guide</h2>

            <h3>Prerequisites</h3>
            <ul>
                <li>Java JDK 8 or higher installed</li>
                <li>Windows/Linux/macOS operating system</li>
            </ul>

            <h3>Installation & Running</h3>

            <h4>Step 1: Compile the Application</h4>
            <div class="code-block">
javac -d bin src/main/java/com/rskworld/mathtools/*.java src/main/java/com/rskworld/mathtools/panels/*.java src/main/java/com/rskworld/mathtools/utils/*.java
            </div>

            <h4>Step 2: Run the Application</h4>
            <div class="code-block">
java -cp bin com.rskworld.mathtools.Main
            </div>

            <div class="example-box">
                <h5>💡 Pro Tip:</h5>
                <p>You can create a batch file (.bat on Windows, .sh on Linux/Mac) with the run command for easy launching.</p>
            </div>
        </div>

        <div class="section">
            <h2>🛠️ Available Tools</h2>

            <div class="tool-grid">
                <div class="tool-card">
                    <h4>🧮 Calculator</h4>
                    <p>Basic and scientific calculator with operations: +, -, ×, ÷, √, x², ±</p>
                    <strong>Example:</strong> 15 + 27 = 42
                </div>

                <div class="tool-card">
                    <h4>📏 Unit Converter</h4>
                    <p>Convert between length, weight, temperature, and volume units</p>
                    <strong>Example:</strong> 100 cm = 1 m
                </div>

                <div class="tool-card">
                    <h4>🔢 Number System</h4>
                    <p>Convert between Decimal, Binary, Hexadecimal, and Octal</p>
                    <strong>Example:</strong> Decimal 42 = Binary 101010
                </div>

                <div class="tool-card">
                    <h4>📐 Equation Solver</h4>
                    <p>Solve linear and quadratic equations</p>
                    <strong>Example:</strong> x² + 5x + 6 = 0 → (x+2)(x+3) = 0
                </div>

                <div class="tool-card">
                    <h4>📊 Statistics</h4>
                    <p>Calculate mean, median, mode, variance, standard deviation</p>
                    <strong>Example:</strong> Data: 1,2,3,4,5 → Mean: 3.00
                </div>

                <div class="tool-card">
                    <h4>💰 Financial</h4>
                    <p>EMI, Simple Interest, and Compound Interest calculations</p>
                    <strong>Example:</strong> Principal: $1000, Rate: 5%, Time: 1yr → SI: $50
                </div>

                <div class="tool-card">
                    <h4>📐 Geometry</h4>
                    <p>Area and volume calculations for 2D/3D shapes</p>
                    <strong>Example:</strong> Circle radius 5 → Area: 78.54
                </div>

                <div class="tool-card">
                    <h4>🔢 Matrix Calculator</h4>
                    <p>3x3 matrix operations: addition, subtraction, multiplication</p>
                    <strong>Example:</strong> Matrix A × Matrix B
                </div>

                <div class="tool-card">
                    <h4>🔍 Prime Tools</h4>
                    <p>Primality testing, factorization, and prime number generation</p>
                    <strong>Example:</strong> Is 17 prime? Yes
                </div>

                <div class="tool-card">
                    <h4>⚖️ BMI Calculator</h4>
                    <p>Calculate Body Mass Index and health status</p>
                    <strong>Example:</strong> Height: 170cm, Weight: 70kg → BMI: 24.2 (Normal)
                </div>

                <div class="tool-card">
                    <h4>🔐 Password Generator</h4>
                    <p>Create secure, randomized passwords</p>
                    <strong>Example:</strong> Generate 12-character secure password
                </div>

                <div class="tool-card">
                    <h4>📅 Age Calculator</h4>
                    <p>Calculate exact age in years, months, and days</p>
                    <strong>Example:</strong> Born: 1990-01-01 → Age: 36 years, 0 months, 23 days
                </div>

                <div class="tool-card">
                    <h4>💼 GST Calculator</h4>
                    <p>Fast Goods and Services Tax calculations</p>
                    <strong>Example:</strong> Amount: $100, GST: 18% → Total: $118
                </div>

                <div class="tool-card">
                    <h4>📈 Function Plotter</h4>
                    <p>Dynamic graphing of quadratic functions</p>
                    <strong>Example:</strong> Plot y = x² + 2x + 1
                </div>

                <div class="tool-card">
                    <h4>📝 History</h4>
                    <p>Track and review all your calculations</p>
                    <strong>Example:</strong> View all previous calculations with timestamps
                </div>
            </div>
        </div>

        <div class="section">
            <h2>⌨️ Keyboard Shortcuts</h2>

            <div class="keyboard-shortcuts">
                <div class="shortcut-item">
                    <span>F1 - F12</span>
                    <span>Direct access to the first 12 tools</span>
                </div>
                <div class="shortcut-item">
                    <span>F13</span>
                    <span>GST Calculator</span>
                </div>
                <div class="shortcut-item">
                    <span>F14</span>
                    <span>Function Plotter</span>
                </div>
                <div class="shortcut-item">
                    <span>F15</span>
                    <span>History Panel</span>
                </div>
            </div>
        </div>

        <div class="section">
            <h2>📖 Detailed Usage Examples</h2>

            <h3>Calculator Tool</h3>
            <div class="example-box">
                <h5>Basic Operations:</h5>
                <p>1. Enter first number (e.g., 15)</p>
                <p>2. Click operator (+, -, ×, ÷)</p>
                <p>3. Enter second number (e.g., 27)</p>
                <p>4. Click "=" to get result (42)</p>
                <p><strong>Scientific functions:</strong> √ (square root), x² (square), ± (negate)</p>
            </div>

            <h3>Statistics Tool</h3>
            <div class="example-box">
                <h5>Data Input:</h5>
                <p>Enter numbers separated by commas or spaces: <code>10, 20, 30, 40, 50</code></p>
                <p>Click "Calculate Statistics" to get:</p>
                <ul>
                    <li>Count: 5</li>
                    <li>Mean: 30.00</li>
                    <li>Median: 30.00</li>
                    <li>Variance: 200.00</li>
                    <li>Standard Deviation: 14.14</li>
                </ul>
            </div>

            <h3>Geometry Tool</h3>
            <div class="example-box">
                <h5>Shape Calculations:</h5>
                <p>1. Select shape from dropdown (Circle, Rectangle, Square, etc.)</p>
                <p>2. Enter required dimensions</p>
                <p>3. Click "Calculate Area/Volume"</p>
                <p><strong>Example:</strong> Circle with radius 5 → Area: 78.54, Circumference: 31.42</p>
            </div>

            <h3>History Feature</h3>
            <div class="example-box">
                <h5>Calculation Tracking:</h5>
                <p>All calculations are automatically saved to history</p>
                <p>Access the History tab to view all previous calculations</p>
                <p>Use "Refresh" to update the list, "Clear History" to reset</p>
            </div>
        </div>

        <div class="section">
            <h2>🏗️ Technical Architecture</h2>

            <h3>Project Structure</h3>
            <div class="code-block">
java-math-tools/
├── src/main/java/com/rskworld/mathtools/
│   ├── Main.java                 # Application entry point
│   ├── MathToolsFrame.java       # Main GUI frame with tabbed interface
│   ├── panels/                   # Individual tool panels
│   │   ├── CalculatorPanel.java
│   │   ├── UnitConverterPanel.java
│   │   ├── NumberSystemPanel.java
│   │   ├── EquationSolverPanel.java
│   │   ├── StatisticsPanel.java
│   │   ├── FinancialPanel.java
│   │   ├── GeometryPanel.java
│   │   ├── MatrixPanel.java
│   │   ├── PrimePanel.java
│   │   ├── BMIPanel.java
│   │   ├── PasswordPanel.java
│   │   ├── AgeCalculatorPanel.java
│   │   ├── GSTPanel.java
│   │   ├── PlotterPanel.java
│   │   └── HistoryPanel.java
│   └── utils/                    # Utility classes
│       ├── ThemeManager.java     # UI theming and styling
│       └── HistoryManager.java   # Calculation history management
├── bin/                          # Compiled class files
├── README.md                     # Project documentation
├── LICENSE                       # MIT License
└── index.html                    # This documentation file
            </div>

            <h3>Key Classes</h3>
            <ul>
                <li><strong>Main.java:</strong> Entry point, initializes theme and creates main frame</li>
                <li><strong>MathToolsFrame.java:</strong> Main application window with tabbed pane</li>
                <li><strong>ThemeManager.java:</strong> Handles dark theme with red accents</li>
                <li><strong>HistoryManager.java:</strong> Singleton for managing calculation history</li>
                <li><strong>[Tool]Panel.java:</strong> Individual tool implementations</li>
            </ul>

            <h3>Dependencies</h3>
            <ul>
                <li>Java SE 8+</li>
                <li>Java Swing (built-in)</li>
                <li>AWT (built-in)</li>
            </ul>
        </div>

        <div class="section">
            <h2>🎨 UI Theme Details</h2>

            <div class="code-block">
// Theme Color Scheme
Background: RGB(20, 20, 20)     // Deep charcoal
Panel BG: RGB(30, 30, 30)       // Dark gray
Accent Red: RGB(255, 50, 50)    // Bright red
Text: RGB(255, 255, 255)        // Pure white
Input BG: RGB(45, 45, 45)       // Medium gray
Button BG: RGB(60, 60, 60)      // Light gray
            </div>

            <p><strong>Features:</strong></p>
            <ul>
                <li>Professional dark mode for eye comfort</li>
                <li>Vibrant red accents inspired by rskworld.in</li>
                <li>Consistent styling across all components</li>
                <li>High contrast for accessibility</li>
            </ul>
        </div>

        <div class="section">
            <h2>🔧 Development Notes</h2>

            <h3>Building from Source</h3>
            <div class="code-block">
# Create bin directory
mkdir bin

# Compile all Java files
javac -d bin -cp src src/main/java/com/rskworld/mathtools/*.java src/main/java/com/rskworld/mathtools/panels/*.java src/main/java/com/rskworld/mathtools/utils/*.java

# Run the application
java -cp bin com.rskworld.mathtools.Main
            </div>

            <h3>Code Quality</h3>
            <ul>
                <li>Modular design with separate panels for each tool</li>
                <li>Consistent error handling with user-friendly messages</li>
                <li>Memory-efficient history management (max 100 entries)</li>
                <li>Thread-safe UI operations using SwingUtilities</li>
            </ul>
        </div>

        <div class="credits">
            <h2>👨‍💻 Credits & License</h2>

            <div class="developer-info">
                <div class="developer-card">
                    <h4>🚀 Developer</h4>
                    <p><strong>Molla Samser</strong></p>
                    <p>Java Developer & Software Engineer</p>
                </div>

                <div class="developer-card">
                    <h4>🎨 Designer & Tester</h4>
                    <p><strong>Rima Khatun</strong></p>
                    <p>UI/UX Designer & Quality Assurance</p>
                </div>

                <div class="developer-card">
                    <h4>🌐 Website</h4>
                    <p><strong>rskworld.in</strong></p>
                    <p>Project Homepage & Portfolio</p>
                </div>
            </div>

            <h3>📜 License</h3>
            <div class="license">MIT License

Copyright (c) 2026 Molla Samser (rskworld.in)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.</div>

            <p style="margin-top: 20px; color: #666;">
                <strong>Year:</strong> 2026<br>
                <strong>Version:</strong> 1.0.0<br>
                <strong>Platform:</strong> Cross-platform (Java)
            </p>
        </div>
    </div>

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