.phontip input {
      width: 100%;
      padding: 12px;
      font-size: 16px;
      border: 1px solid #ced4da;
      border-radius: 8px;
      margin-bottom: 10px;
      transition: border 0.3s;
      margin-top: 20px;
    }
    .phontip input:focus {
      outline: none;
      border-color: #007bff;
    }
    .phontip .result {
      margin-top: 15px;
      font-size: 18px;
      color: #212529;
      word-break: break-word;
    }
    .phontip .error {
      color: #dc3545;
    }
    .phontip .note {
      font-size: 13px;
      color: #6c757d;
    }