                    <input type="tel" class="form-control" id="phone" name="phone" required pattern="[0-9\-\+\s\(\)]{8,20}">
                                            <div class="valid-feedback">
                                                Phone number is valid!
                                            </div>
                                            <div class="invalid-feedback">
                                                Please provide a valid phone number (8-20 characters).
              