form {
  width: 85.65%;
  margin: auto;
}

.form_item:not(:first-child) {
  margin-top: 20px;
}

.form_item .head_box {
  width: 100%;
  display: flex;
  align-items: center;
  padding-bottom: 10px;
}

/* 必須 */
.form_item .head_box p.must {
  margin-left: 15px;
  white-space: nowrap;
  color: #FC0909;
}

/* エラー文 */
.form_item .element_box p.errors {
  color: #FC0909;
  margin-top: 5px;
}

.element_box {
  width: 100%;
  border-left: unset;
  border-right: unset;
}

.input_wrap {
  width: 100%;
}
.double_text_input_wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* submitボタン */
.submit_btn {
  width: calc(272 / 300 * 100%);
  min-width: 200px;
  padding: 13px;
  background-color: var(--site_color2);
  text-align: center;
  display: block;
  border-radius: 100px;
  margin: auto;
  cursor: pointer;
  transition: all 0.5s;
  color: #ffffff;
  margin-bottom: 16px;
}
@media screen and (max-width: 768px) {
  .submit_btn {
    margin-top: 60px;
    padding: 12px;
  }
}

.submit_btn:hover {
  opacity: 0.7;
}

/* テキストボックス用スタイル */
.input_item.text {
  width: 100%;
  padding: 12px;
  border-radius: 2px;
  background-color: #F4F4F4;
  width: 100%;
}

.input_item.half {
  width: 48%;
}
/* テキストエリア用スタイル */
.input_item.textarea {
  width: 100%;
  padding: 12px;
  background-color: #F4F4F4;
  border-radius: 5px;
  height: 20vw;
  max-height: 270px;
  min-height: 160px;
}

/* ====================================================================================================== */
/* レスポンシブ */
/* ====================================================================================================== */
@media screen and (max-width: 1024px) {
  form {
    width: 90%;
    padding-top: 60px;
    padding-bottom: 80px;
  }
}

@media screen and (max-width: 768px) {

  .form_item:not(:first-child) {
    margin-top: 30px;
  }

  .head_box {
    width: 100%;
    padding: 15px 0px;
  }

  .form_item:first-child .head_box {
    border-top: unset;
  }

  .form_item:first-child .element_box {
    border-top: unset;
  }

  .element_box {
    width: 100%;
    padding: 20px 0px;
  }

  .input_item.text {
    padding: 12px;
  }
}

@media screen and (max-width: 480px) {
  .submit_btn {
    margin-top: 40px;
  }
}