<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Calculatrice Style Apple</title>
    <style>
        body {
            margin: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background: #000;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }

        .calculator {
            width: 320px;
            border-radius: 30px;
            background: #1c1c1e;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
            padding: 20px;
        }

        .screen {
            height: 80px;
            background: #333333;
            color: white;
            font-size: 36px;
            border-radius: 15px;
            text-align: right;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: inset 0 -4px 10px rgba(0, 0, 0, 0.3);
        }

        .buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
        }

        button {
            height: 60px;
            border: none;
            border-radius: 50%;
            font-size: 24px;
            color: white;
            background: #505050;
            box-shadow: 0 4px 5px rgba(0, 0, 0, 0.2);
            cursor: pointer;
            transition: all 0.2s ease;
        }

        button:active {
            transform: scale(0.9);
        }

        button.orange {
            background: #ff9500;
        }

        button.light-gray {
            background: #d4d4d2;
            color: black;
        }

        button.dark-gray {
            background: #505050;
        }
    </style>
</head>
<body>
    <div class="calculator">
        <div class="screen" id="screen">0</div>
        <div class="buttons">
            <button class="light-gray" onclick="clearScreen()">AC</button>
            <button class="light-gray" onclick="setOperator('%')">±</button>
            <button class="light-gray" onclick="setOperator('%')">%</button>
            <button class="orange" onclick="setOperator('/')">÷</button>

            <button class="dark-gray" onclick="appendNumber(7)">7</button>
            <button class="dark-gray" onclick="appendNumber(8)">8</button>
            <button class="dark-gray" onclick="appendNumber(9)">9</button>
            <button class="orange" onclick="setOperator('*')">×</button>

            <button class="dark-gray" onclick="appendNumber(4)">4</button>
            <button class="dark-gray" onclick="appendNumber(5)">5</button>
            <button class="dark-gray" onclick="appendNumber(6)">6</button>
            <button class="orange" onclick="setOperator('-')">−</button>

            <button class="dark-gray" onclick="appendNumber(1)">1</button>
            <button class="dark-gray" onclick="appendNumber(2)">2</button>
            <button class="dark-gray" onclick="appendNumber(3)">3</button>
            <button class="orange" onclick="setOperator('+')">+</button>

            <button class="dark-gray" style="grid-column: span 2;" onclick="appendNumber(0)">0</button>
            <button class="dark-gray" onclick="appendNumber('.')">.</button>
            <button class="orange" onclick="calculate()">=</button>
        </div>
    </div>

    <script>
        const screen = document.getElementById('screen');
        let currentNumber = '';
        let previousNumber = '';
        let operator = null;

        function appendNumber(number) {
            currentNumber += number;
            updateScreen();
        }

        function setOperator(op) {
            if (currentNumber === '') return;
            if (previousNumber !== '') calculate();
            operator = op;
            previousNumber = currentNumber;
            currentNumber = '';
        }

        function calculate() {
            if (currentNumber === '' || operator === null) return;
            let result;
            const prev = parseFloat(previousNumber);
            const curr = parseFloat(currentNumber);

            switch (operator) {
                case '+':
                    result = prev + curr;
                    break;
                case '-':
                    result = prev - curr;
                    break;
                case '*':
                    result = prev * curr;
                    break;
                case '/':
                    result = curr !== 0 ? prev / curr : 'Error';
                    break;
                default:
                    return;
            }

            currentNumber = result;
            operator = null;
            previousNumber = '';
            updateScreen();
        }

        function clearScreen() {
            currentNumber = '';
            previousNumber = '';
            operator = null;
            updateScreen();
        }

        function updateScreen() {
            screen.textContent = currentNumber || '0';
        }
    </script>
</body>
</html>
