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calculator
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Scientific Calculator</title>
  <!-- Math.js for evaluation -->
  <script src="https://cdn.jsdelivr.net/npm/[email protected]/lib/browser/math.min.js"></script>
  <!-- KaTeX for rendering math -->
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css" integrity="sha384-" crossorigin="anonymous">
  <script defer src="https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.js" integrity="sha384-" crossorigin="anonymous"></script>
  <script defer src="https://cdn.jsdelivr.net/npm/[email protected]/dist/contrib/auto-render.min.js" integrity="sha384-" crossorigin="anonymous"></script>
  <style>
    body {
      font-family: sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      background: #f2f2f2;
    }
    .calculator {
      background: white;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      padding: 16px;
      width: 360px;
    }
    .display {
      width: 100%;
      height: 48px;
      font-size: 1.25rem;
      padding: 8px;
      border: 1px solid #ccc;
      border-radius: 4px;
      box-sizing: border-box;
    }
    #preview {
      min-height: 32px;
      margin: 8px 0 12px;
      padding: 4px;
      background: #fafafa;
      border: 1px solid #ddd;
      border-radius: 4px;
    }
    .tabs { display: flex; margin-bottom: 8px; }
    .tab {
      flex: 1;
      text-align: center;
      padding: 8px;
      cursor: pointer;
      border-bottom: 2px solid transparent;
    }
    .tab.active { border-color: #007bff; color: #007bff; }
    .buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
    button { padding: 12px; font-size: 1rem; border: 1px solid #aaa; border-radius: 4px; background: #e6e6e6; cursor: pointer; transition: background 0.2s; }
    button:hover { background: #d4d4d4; }
    .op { background: #bbb; }
    .wide { grid-column: span 2; }
  </style>
</head>
<body>
  <div class="calculator">
    <input type="text" class="display" id="display" readonly />
    <div id="preview"></div>
    <div class="tabs">
      <div class="tab active" data-mode="main">main</div>
      <div class="tab" data-mode="abc">abc</div>
      <div class="tab" data-mode="func">func</div>
      <div class="tab" id="toggle-mode">RAD</div>
    </div>
    <div class="buttons" id="buttons-container">
      <!-- main grid -->
      <button data-cmd="7">7</button><button data-cmd="8">8</button><button data-cmd="9">9</button><button data-cmd="/" class="op">÷</button>
      <button data-cmd="4">4</button><button data-cmd="5">5</button><button data-cmd="6">6</button><button data-cmd="*" class="op">×</button>
      <button data-cmd="1">1</button><button data-cmd="2">2</button><button data-cmd="3">3</button><button data-cmd="-" class="op">−</button>
      <button data-cmd="0">0</button><button data-cmd=".">.</button><button data-cmd="ans">ans</button><button data-cmd="+" class="op">+</button>
      <button data-cmd="%">%</button><button data-cmd="frac">a/b</button><button data-cmd="back">←</button><button data-cmd="forward">→</button>
      <button class="wide" data-cmd="clear">C</button><button data-cmd="del">DEL</button><button class="wide" data-cmd="enter">=</button>
    </div>
  </div>

  <script>
    document.addEventListener('DOMContentLoaded', () => {
      const display = document.getElementById('display');
      const preview = document.getElementById('preview');
      let ans = '';
      let mode = 'main';
      let angleMode = 'deg';

      // update KaTeX preview
      function updatePreview() {
        try {
          katex.render(display.value || ' ', preview, {throwOnError:false});
        } catch {}
      }

      // evaluate with math.js
      function evaluate(expr) {
        try {
          math.config({});
          if (angleMode === 'deg') {
            expr = expr.replace(/(sin|cos|tan)\(/g, match => `(${match}"deg", `);
          }
          const result = math.evaluate(expr);
          ans = result.toString();
          return ans;
        } catch {
          return 'Error';
        }
      }

      // button logic
      document.getElementById('buttons-container').addEventListener('click', e => {
        if (!e.target.matches('button')) return;
        const cmd = e.target.dataset.cmd;
        switch (cmd) {
          case 'clear': display.value = ''; break;
          case 'del': display.value = display.value.slice(0, -1); break;
          case 'ans': display.value += ans; break;
          case 'enter': display.value = evaluate(display.value); break;
          case 'frac': display.value += '/'; break;
          case 'square': display.value += '^(2)'; break;
          case '^': display.value += '^('; break;
          case 'sqrt(': case 'nthroot(': case 'abs(': case 'sin(': case 'cos(': case 'tan(': case '(': case ')': case ',': case 'pi':
            display.value += cmd === 'pi' ? 'pi' : cmd;
            break;
          default:
            if (/^[0-9.+\-*/%^]$/.test(cmd)) display.value += cmd;
        }
        updatePreview();
      });

      // keyboard shortcuts
      document.addEventListener('keydown', e => {
        const k = e.key;
        if (k === 'Enter') { display.value = evaluate(display.value); updatePreview(); e.preventDefault(); }
        else if (k === 'Backspace') { display.value = display.value.slice(0, -1); updatePreview(); e.preventDefault(); }
        else if (k === 'p') { display.value += 'pi'; updatePreview(); e.preventDefault(); }
        else if (k === 's') { display.value += 'sin('; updatePreview(); e.preventDefault(); }
        else if (k === 'c') { display.value += 'cos('; updatePreview(); e.preventDefault(); }
        else if (k === 't') { display.value += 'tan('; updatePreview(); e.preventDefault(); }
      });

      // modes & toggle
      const modeButtons = {
        abc: [{label:'a²',cmd:'square'},{label:'a^b',cmd:'^'},{label:'|a|',cmd:'abs('},{label:'√',cmd:'sqrt('},{label:'ⁿ√',cmd:'nthroot('},{label:'π',cmd:'pi'}],
        func: [{label:'sin',cmd:'sin('},{label:'cos',cmd:'cos('},{label:'tan',cmd:'tan('},{label:'(',cmd:'('},{label:')',cmd:')'},{label:',',cmd:','}]
      };
      function renderMode() {
        const c = document.getElementById('buttons-container');
        while (c.children.length > 20) c.removeChild(c.lastChild);
        if (mode !== 'main') modeButtons[mode].forEach(b=>{ const btn=document.createElement('button');btn.textContent=b.label;btn.dataset.cmd=b.cmd;c.insertBefore(btn,c.firstChild); });
      }
      document.querySelectorAll('.tab[data-mode]').forEach(tab => tab.addEventListener('click', () => {
        document.querySelectorAll('.tab').forEach(t=>t.classList.remove('active'));
        tab.classList.add('active'); mode=tab.dataset.mode; renderMode(); updatePreview();
      }));
      document.getElementById('toggle-mode').addEventListener('click', e => { angleMode = angleMode==='deg'?'rad':'deg'; e.target.textContent = angleMode.toUpperCase(); });

      renderMode(); updatePreview();
    });
  </script>
</body>
</html>