<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Expense Tracker</title>
  <style>
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      margin: 0;
      padding: 0;
      background-color: #f0f0f0;
    }

    header {
      background-color: #333;
      color: #fff;
      padding: 1em;
      text-align: center;
    }

    #expenses {
      width: 60%;
      margin: 2em auto;
      background-color: #fff;
      padding: 1em;
      border-radius: 8px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 1em;
    }

    th, td {
      border: 1px solid #ddd;
      padding: 12px;
      text-align: left;
    }

    th {
      background-color: #333;
      color: #fff;
    }

    form {
      width: 50%;
      margin: 2em auto;
      background-color: #fff;
      padding: 1em;
      border-radius: 8px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    }

    label, input, button {
      display: block;
      margin-bottom: 1em;
    }

    button {
      background-color: #333;
      color: #fff;
      padding: 0.8em;
      cursor: pointer;
      border: none;
      border-radius: 4px;
    }

    #totalExpense {
      margin-top: 1em;
      font-size: 18px;
    }
  </style>
</head>
<body>
  <header>
    <h1>Expense Tracker</h1>
  </header>

  <form id="expenseForm">
    <label for="expenseName">Expense Name:</label>
    <input type="text" id="expenseName" required>

    <label for="expenseAmount">Expense Amount:</label>
    <input type="number" id="expenseAmount" required>

    <button type="button" onclick="addExpense()">Add Expense</button>
  </form>

  <div id="expenses">
    <h2>Expense List</h2>
    <table>
      <thead>
        <tr>
          <th>Name</th>
          <th>Amount</th>
        </tr>
      </thead>
      <tbody id="expenseList"></tbody>
    </table>

    <div id="totalExpense">Total Expense: $0</div>
  </div>

  <script>
    let totalExpense = 0;

    function addExpense() {
      const name = document.getElementById("expenseName").value;
      const amount = parseFloat(document.getElementById("expenseAmount").value);

      if (name && !isNaN(amount) && amount > 0) {
        const expenseList = document.getElementById("expenseList");
        const newRow = document.createElement("tr");
        newRow.innerHTML = `<td>${name}</td><td>$${amount.toFixed(2)}</td>`;
        expenseList.appendChild(newRow);

        totalExpense += amount;
        updateTotalExpense();

        // Additional logic to save data to backend or local storage
      } else {
        alert("Please enter valid values.");
      }
    }

    function updateTotalExpense() {
      const totalExpenseElement = document.getElementById("totalExpense");
      totalExpenseElement.textContent = `Total Expense: $${totalExpense.toFixed(2)}`;
    }
  </script>
  
</<!-- Existing HTML remains unchanged -->

<div id="expenses">
  <h2>Expense List</h2>
  <table>
    <!-- Existing table structure remains unchanged -->

    <tfoot>
      <tr>
        <td>
          <button id="downloadBtn" onclick="downloadExpenseSheet()">Download Expense Sheet</button>
        </td>
      </tr>
    </tfoot>
  </table>

  <div id="totalExpense">Total Expense: $0</div>
</div>

<!-- Existing JavaScript remains unchanged -->

<script>
  function downloadExpenseSheet() {
    const data = generateExpenseData();
    const blob = new Blob([data], { type: 'text/plain' });
    const url = window.URL.createObjectURL(blob);

    const a = document.createElement('a');
    a.href = url;
    a.download = 'expense_sheet.txt';
    document.body.appendChild(a);
    a.click();

    window.URL.revokeObjectURL(url);
  }

  function generateExpenseData() {
    const rows = Array.from(document.getElementById("expenseList").getElementsByTagName("tr"));
    const data = rows.map(row => Array.from(row.children).map(cell => cell.textContent).join('\t')).join('\n');
    return `Name\tAmount\n${data}`;
  }
</script>

<!-- Existing HTML remains unchanged -->
<body>
</html>

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