.validator h2 {
      margin-bottom: 1rem;
    }

    .form-group {
      margin-bottom: 1rem;
    }

    label {
      display: block;
      margin-bottom: 6px;
      font-weight: bold;
    }

    input {
      width: 100%;
      padding: 12px;
      font-size: 16px;
      border-radius: 8px;
      border: 2px solid #ddd;
      transition: border-color 0.3s;
    }

    input:focus {
      border-color: #0072ff;
      outline: none;
    }

    .result {
      margin-top: 1rem;
      font-weight: bold;
      font-size: 16px;
      text-align: center;
    }

    .valid {
      color: green;
    }

    .invalid {
      color: red;
    }

    button.cardValidate {
      padding: 12px 35px;
      background-color: #0072ff;
      color: #fff;
      border: none;
      border-radius: 8px;
      font-size: 16px;
      cursor: pointer;
      margin-top: 10px;
    }

    button.cardValidate:hover {
      background-color: #005fe0;
    }

    .card-type {
      text-align: right;
      font-size: 14px;
      color: #555;
      font-style: italic;
    }