<style>
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f7f9fc;
    margin: 0;
    padding: 0;
    color: #333;
  }

  h2 {
    text-align: center;
    margin-top: 30px;
    color: #222;
  }

  /* Container giúp căn giữa nội dung */
  .container {
    margin: 30px auto;
    background: white;
    padding: 25px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgb(0 0 0 / 0.1);
  }

  /* Style bảng */
  table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
  }

  th, td {
    padding: 10px 12px;
    border-bottom: 1px solid #ddd;
    text-align: center;
  }

  th {
    background-color: #007bff;
    color: white;
    font-weight: 600;
  }

  tr:hover {
    background-color: #f1f5fb;
  }

  /* Nút bấm */
  .btn {
    padding: 7px 14px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease;
  }

  .btn:hover {
    background-color: #0056b3;
  }


  .btn-secondary {
    background-color: #6c757d;
  }

  .btn-secondary:hover {
    background-color: #5a6268;
  }

  /* Text thông báo thành công */
  .success {
    color: #28a745;
    font-weight: 700;
  }

  /* Form login */
  form {
    max-width: 400px;
    margin: 40px auto 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
  }

  input[type="text"],
  input[type="number"],
  input[type="password"],
  input[type="file"],
  input[type="submit"],
  input[type="button"],
  select {
    padding: 10px 12px;
    border: 1px solid #bbb;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s ease;
  }

  input[type="text"]:focus,
  input[type="password"]:focus,
  input[type="file"]:focus,
  select:focus {
    outline: none;
    border-color: #007bff;
  }

  input[type="submit"],
  input[type="button"] {
    background-color: #007bff;
    color: white;
    border: none;
    font-weight: 600;
    cursor: pointer;
  }

  input[type="submit"]:hover,
  input[type="button"]:hover {
    background-color: #0056b3;
  }

  /* Thông báo lỗi */
  .error {
    color: #dc3545;
    text-align: center;
    font-weight: 600;
  }

</style>
