.mobile-only {
  display: none;
}

.pc-only {
  display: block;
}

@media screen and (max-width: 750px) {
  .mobile-only {
    display: block !important;
  }

  .pc-only {
    display: none !important;
  }
}
.form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 25px 50px;
}
.form .form-item {
  display: flex;
  flex-direction: column;
  text-align: left;
}
.form .form-item .label {
  font-size: 14px;
  color: #636363;
  line-height: 20px;
  margin-bottom: 5px;
}
.form .form-item .label:not(.not-required):before {
  content: "*";
  color: #ff0000;
  margin-right: 5px;
}
.form .form-item input,
.form .form-item select {
  width: 420px;
  height: 46px;
  background: rgba(0, 0, 0, 0.1);
  border-radius: 6px;
  padding: 12px 10px;
  border: none;
  font-size: 16px;
  color: #000000;
  line-height: 22px;
  font-weight: 500;
}
.form .form-item textarea {
  width: 420px;
  height: 92px;
  background: rgba(0, 0, 0, 0.1);
  border-radius: 6px;
  padding: 12px 10px;
  border: none;
  font-size: 16px;
  color: #000000;
  line-height: 22px;
  font-weight: 500;
}
.form .form-item input:focus,
.form .form-item select:focus {
  border: 1px solid #000000;
}
.form .form-item input::placeholder,
.form .form-item select::placeholder,
.form .form-item textarea::placeholder {
  color: rgba(0, 0, 0, 0.2);
  font-size: 16px;
}
.form .form-item select {
  appearance: none;
  background-size: 24px;
  background-position: 97%;
  background-image: url("../images/contact_us/icon-down.png");
  background-color: rgba(0, 0, 0, 0.1);
  background-repeat: no-repeat;
  color: rgba(0, 0, 0, 0.2);
  font-size: 16px;
}
.form .form-item select:valid {
  color: #000;
}
.form .form-item select:focus {
  color: #000;
}
.form .form-item option[disabled] {
  color: rgba(0, 0, 0, 0.2);
}

.form-btn {
  background: linear-gradient(135deg, #2f54eb 0%, #69c0ff 100%);
  box-shadow: 0px 22px 21px -14px rgba(0, 0, 0, 0.25),
    inset 0px -4px 25px 2px #b3e0ff;
  border-radius: 35px;
  margin-top: 70px;
  width: 212px;
  height: 60px;
  border: none;
  font-weight: 500;
  font-size: 18px;
  color: #ffffff;
}

.section-item-lianxi {
  display: none;
}

@media screen and (max-width: 750px) {
  .form {
    grid-template-columns: repeat(1, 1fr);
    width: 100%;
  }
  .form .form-item input,
  .form .form-item select {
    width: 100%;
  }

  .form-btn {
    margin-top: 40px;
    width: 144px;
    height: 45px;
    font-size: 14px;
  }
}