Minimalist Zen Scientific Calculator

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Minimalist Zen Scientific Calculator</title>
  <style>
    body {
      font-family: 'Arial', sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      background-color: #f0f0f0;
      margin: 0;
    }
    .calculator {
      background-color: #f0f0f0;
      border-radius: 10px;
      box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      width: 300px;
    }
    .screen {
      background-color: #e0e0e0;
      color: #333;
      font-size: 2rem;
      padding: 10px;
      text-align: right;
      word-wrap: break-word;
      overflow-wrap: break-word;
      min-height: 60px;
    }
    .buttons {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
    }
    button {
      background-color: #ccc;
      border: none;
      color: #333;
      cursor: pointer;
      font-size: 1.5rem;
      padding: 20px 0;
      transition: background-color 0.3s ease;
    }
    button:hover {
      background-color: #ddd;
    }
    button.operator {
      background-color: #800;
      color: #fff;
    }
    button.special {
      background-color: #098;
      color: #fff;
    }
    button.equal {
      background-color: #43d;
      grid-column: span 1;
      color: #fff;
    }
  </style>
</head>
<body>
  <div class="calculator">
    <div class="screen" id="screen">0</div>
    <div class="buttons">
      <button type="button" class="operator">C</button>
      <button type="button" class="operator">±</button>
      <button type="button" class="operator">%</button>
      <button type="button" class="operator">÷</button>
      <button type="button">7</button>
      <button type="button">8</button>
      <button type="button">9</button>
      <button type="button" class="operator">x</button>
      <button type="button">4</button>
      <button type="button">5</button>
      <button type="button">6</button>
      <button type="button" class="operator">-</button>
      <button type="button">1</button>
      <button type="button">2</button>
      <button type="button">3</button>
      <button type="button" class="operator">+</button>
      <button type="button" class="special">π</button>
      <button type="button">0</button>
      <button type="button">.</button>
      <button type="button" class="equal">=</button>
    </div>
  </div>
  <script>
document.addEventListener('DOMContentLoaded', function() {
  const screen = document.getElementById('screen');
  const buttons = document.querySelectorAll('.buttons button');
  let calculation = '';
  let currentInput = '';
  let lastOperator = '';
  function updateScreen(value) {
    screen.textContent = value;
  }
  buttons.forEach(button => {
    button.addEventListener('click', () => {
      const buttonText = button.textContent;
      if (buttonText === 'C') {
        calculation = '';
        currentInput = '';
        lastOperator = '';
        updateScreen('0');
      } else if (buttonText === '±') {
        if (currentInput) {
          currentInput = (parseFloat(currentInput) * -1).toString();
          updateScreen(currentInput);
        }
      } else if (buttonText === '%') {
        if (currentInput) {
          currentInput = (parseFloat(currentInput) / 100).toString();
          updateScreen(currentInput);
        }
      } else if (buttonText === 'π') {
        currentInput = Math.PI.toString();
        updateScreen(currentInput);
      } else if (buttonText === '=') {
        if (currentInput && lastOperator) {
          calculation += currentInput;
          try {
            calculation = eval(calculation).toString();
            updateScreen(calculation);
            currentInput = calculation;
            calculation = '';
            lastOperator = '';
          } catch (e) {
            updateScreen('Error');
            calculation = '';
            currentInput = '';
            lastOperator = '';
          }
        }
      } else if (['÷', 'x', '-', '+'].includes(buttonText)) {
        if (currentInput) {
          calculation += currentInput;
          calculation += buttonText === '÷' ? '/' : buttonText === 'x' ? '*' : buttonText;
          lastOperator = buttonText;
          currentInput = '';
          updateScreen(buttonText);
        }
      } else {
        currentInput += buttonText;
        updateScreen(currentInput);
      }
    });
  });
});
  </script>
</body>
</html>

Minimalist Zen Scientific Calculator - MeggiTools