<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Basic Calculator - CalcHub</title>
    <link rel="stylesheet" href="styles.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css">
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap" rel="stylesheet">
    <script src="script.js" defer></script>
    <style>
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary: #7c3aed;
            --secondary-dark: #6d28d9;
            --accent: #10b981;
            --accent-dark: #059669;
            --text-light: #f8fafc;
            --text-dark: #1e293b;
            --background: #f1f5f9;
            --card-bg: rgba(255, 255, 255, 0.95);
            --nav-bg: rgba(30, 41, 59, 0.95);
            --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.15);
            --border-radius: 10px;
            --glass-bg: rgba(255, 255, 255, 0.1);
            --glass-border: rgba(255, 255, 255, 0.2);
            --button-hover-scale: 1.05;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

        body {
            font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
            margin: 0;
            padding: 0;
            background: linear-gradient(135deg, #0f172a, #1e293b);
            color: var(--text-dark);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
            overflow-x: hidden;
        }
        
        /* Background visual elements */
        body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: 
                radial-gradient(circle at 15% 50%, rgba(124, 58, 237, 0.12) 0%, rgba(124, 58, 237, 0) 25%),
                radial-gradient(circle at 85% 30%, rgba(37, 99, 235, 0.15) 0%, rgba(37, 99, 235, 0) 30%);
            z-index: -1;
        }

        /* Navigation */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: var(--nav-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            z-index: 1000;
            padding: 0.75rem 0;
            box-shadow: var(--shadow-sm);
        }

        .container {
            width: 90%;
            max-width: 1280px;
            margin: 0 auto;
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            color: var(--text-light);
            text-decoration: none;
            font-size: 1.5rem;
            font-weight: 700;
            transition: transform var(--transition-fast);
        }
        
        .logo:hover {
            transform: scale(1.05);
        }

        .logo i {
            margin-right: 10px;
            color: var(--primary);
            transition: transform var(--transition-fast);
        }
        
        .logo:hover i {
            transform: rotate(-15deg);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .nav-link {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 500;
            transition: all var(--transition-fast);
            padding: 0.5rem 1rem;
            border-radius: 5px;
            position: relative;
            overflow: hidden;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width 0.3s ease, left 0.3s ease;
        }

        .nav-link:hover {
            color: var(--primary);
        }
        
        .nav-link:hover::after {
            width: 100%;
            left: 0;
        }

        .nav-link.active {
            background-color: rgba(37, 99, 235, 0.2);
            color: var(--primary);
        }
        
        .nav-link.active::after {
            width: 100%;
            left: 0;
        }

        /* Tool header */
        .tool-header {
            text-align: center;
            margin-bottom: 2rem;
            color: var(--text-light);
            animation: fadeInDown 0.8s ease;
            padding-top: 1rem;
            position: relative;
        }

        .tool-header h1 {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            background: linear-gradient(to right, var(--text-light), var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            display: inline-block;
        }

        .tool-header p {
            font-size: 1.1rem;
            opacity: 0.9;
        }

        /* Calculator Styling */
        .main-content {
            padding: 8rem 2rem 4rem;
            min-height: 100vh;
            background: linear-gradient(135deg, #0f172a, #1a1a2e);
            color: var(--text-light);
        }

        .content-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            gap: 2rem;
        }

        .centered-content {
            text-align: center;
            margin-bottom: 3rem;
            animation: fadeIn 0.8s ease;
            max-width: 800px;
            margin: 0 auto 3rem;
        }

        .page-title {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, #fff, #e2e8f0);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1.2;
        }

        .page-description {
            font-size: 1.25rem;
            color: rgba(255, 255, 255, 0.9);
            line-height: 1.6;
            margin: 0 auto;
            max-width: 600px;
        }

        .calculator-container {
            width: 100%;
            max-width: 360px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-radius: var(--border-radius-xl);
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: var(--shadow-lg);
            overflow: hidden;
        }

        .calculator-screen {
            padding: 1.5rem;
            text-align: right;
            background: rgba(0, 0, 0, 0.2);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .previous-operand {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.25rem;
            min-height: 1.5rem;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .current-operand {
            color: white;
            font-size: 2.5rem;
            font-weight: 500;
            margin-top: 0.5rem;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .calculator-buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1px;
            background: rgba(0, 0, 0, 0.1);
        }

        .calculator-button {
            border: none;
            outline: none;
            background: rgba(255, 255, 255, 0.05);
            color: white;
            font-size: 1.5rem;
            padding: 1.25rem 0;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .calculator-button:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .calculator-button:active {
            background: rgba(255, 255, 255, 0.15);
            transform: translateY(1px);
        }

        .calculator-button::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            transform: translate(-50%, -50%) scale(0);
            transition: transform 0.3s ease-out;
            pointer-events: none;
        }

        .calculator-button:active::after {
            transform: translate(-50%, -50%) scale(1.5);
            opacity: 0;
            transition: transform 0.5s ease-out, opacity 0.5s ease-out;
        }

        .operator {
            background: rgba(79, 70, 229, 0.2);
        }

        .operator:hover {
            background: rgba(79, 70, 229, 0.3);
        }

        .equals {
            background: var(--primary);
        }

        .equals:hover {
            background: var(--primary-dark);
        }

        .clear, .delete {
            background: rgba(239, 68, 68, 0.2);
        }

        .clear:hover, .delete:hover {
            background: rgba(239, 68, 68, 0.3);
        }

        .calculator-info {
            max-width: 600px;
            margin: 3rem auto;
        }

        .calculator-shortcuts {
            background: rgba(255, 255, 255, 0.05);
            border-radius: var(--border-radius-lg);
            padding: 1.5rem;
            margin-top: 2rem;
        }

        .shortcuts-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--text-light);
        }

        .shortcuts-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }

        .shortcut-item {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .key {
            background: rgba(255, 255, 255, 0.1);
            border-radius: var(--border-radius-sm);
            padding: 0.25rem 0.5rem;
            font-size: 0.875rem;
            font-family: monospace;
            min-width: 2rem;
            text-align: center;
        }

        @media (max-width: 576px) {
            .calculator-container {
                max-width: 100%;
                border-radius: var(--border-radius-lg);
            }
            
            .calculator-button {
                padding: 1rem 0;
            }
            
            .current-operand {
                font-size: 2rem;
            }
        }

        /* Animations */
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Additional responsive styles */
        @media (max-width: 768px) {
            .calculator-display {
                padding: 1.2rem;
            }
            
            .current-operand {
                font-size: 2rem;
            }
            
            .buttons-grid {
                gap: 0.8rem;
            }
            
            .calculator-btn {
                padding: 1rem;
                font-size: 1.2rem;
            }
        }

        /* Page transition overlay */
        .page-transition-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: var(--text-dark);
            z-index: 2000;
            transform: translateY(100%);
            pointer-events: none;
        }

        .page-transition-overlay.active {
            animation: pageTransition 0.6s ease-in-out;
        }

        @keyframes pageTransition {
            0% { transform: translateY(100%); }
            100% { transform: translateY(0); }
        }

        /* Enhanced navbar */
        .nav-link {
            position: relative;
            transition: all 0.3s ease;
        }

        .nav-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 5px;
            transform: scale(0);
            transition: transform 0.3s ease;
            z-index: -1;
        }

        .nav-link:hover::before {
            transform: scale(1);
        }

        .nav-link.active {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(124, 58, 237, 0.2));
            color: white;
            box-shadow: 0 2px 10px rgba(37, 99, 235, 0.15);
        }
    </style>
</head>
<body>
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    <div class="page-transition-overlay"></div>

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    <nav class="navbar">
        <div class="nav-container">
            <a href="index.html" class="logo">
                <i class="fas fa-calculator"></i>
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                <i class="fas fa-bars"></i>
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    <!-- Main Content -->
    <div class="main-content">
        <div class="content-container">
            <div class="centered-content">
                <h1 class="page-title">Basic <span class="gradient-text">Calculator</span></h1>
                <p class="page-description">
                    A clean, intuitive calculator for everyday arithmetic operations. 
                    Perform addition, subtraction, multiplication, and division with ease.
                </p>
        </div>
        
            <div class="calculator-container animate-on-scroll">
                <div class="calculator-screen">
                    <div class="previous-operand" data-previous-operand></div>
                    <div class="current-operand" data-current-operand>0</div>
            </div>
                <div class="calculator-buttons">
                    <button class="calculator-button clear" data-all-clear>AC</button>
                    <button class="calculator-button delete" data-delete>DEL</button>
                    <button class="calculator-button operator" data-operation>%</button>
                    <button class="calculator-button operator" data-operation>÷</button>
                    <button class="calculator-button" data-number>7</button>
                    <button class="calculator-button" data-number>8</button>
                    <button class="calculator-button" data-number>9</button>
                    <button class="calculator-button operator" data-operation>×</button>
                    <button class="calculator-button" data-number>4</button>
                    <button class="calculator-button" data-number>5</button>
                    <button class="calculator-button" data-number>6</button>
                    <button class="calculator-button operator" data-operation>-</button>
                    <button class="calculator-button" data-number>1</button>
                    <button class="calculator-button" data-number>2</button>
                    <button class="calculator-button" data-number>3</button>
                    <button class="calculator-button operator" data-operation>+</button>
                    <button class="calculator-button" data-number>0</button>
                    <button class="calculator-button" data-number>.</button>
                    <button class="calculator-button equals" data-equals colspan="2">=</button>
        </div>
    </div>

            <div class="calculator-info">
                <h2 class="mt-5 mb-3">About the Calculator</h2>
                <p>
                    This basic calculator provides an intuitive interface for performing common arithmetic operations. 
                    You can add, subtract, multiply, divide, and calculate percentages with ease. The calculator features 
                    a clean design with responsive buttons and a clear display showing both the current input and the 
                    previous operation.
                </p>
                
                <div class="calculator-shortcuts">
                    <h3 class="shortcuts-title">Keyboard Shortcuts</h3>
                    <div class="shortcuts-grid">
                        <div class="shortcut-item">
                            <span class="key">0-9</span>
                            <span>Number input</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">.</span>
                            <span>Decimal point</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">+</span>
                            <span>Addition</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">-</span>
                            <span>Subtraction</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">*</span>
                            <span>Multiplication</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">/</span>
                            <span>Division</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">Enter</span>
                            <span>Calculate</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">Backspace</span>
                            <span>Delete digit</span>
                        </div>
                        <div class="shortcut-item">
                            <span class="key">Esc</span>
                            <span>Clear all</span>
                </div>
                    </div>
                </div>
                
                <h2 class="mt-5 mb-3">Other Calculators</h2>
                <div class="grid grid-3">
                    <a href="scientific-calculator.html" class="card">
                        <h3>Scientific Calculator</h3>
                        <p>Advanced functions for scientific calculations, including trigonometry, logarithms, and more.</p>
                    </a>
                    <a href="equation-solver.html" class="card">
                        <h3>Equation Solver</h3>
                        <p>Solve linear, quadratic, and other equations with detailed step-by-step solutions.</p>
                    </a>
                    <a href="math-tools.html" class="card">
                        <h3>More Math Tools</h3>
                        <p>Explore our complete collection of mathematical tools and calculators.</p>
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