form {
  width: 85.65%;
  margin: auto;
  padding-top: 5.856515373vw;
  padding-bottom: 8.78477306vw;
}

.form_item {
  display: flex;
}

.form_item .head_box,
.form_item .element_box {
  padding: 15px;
}

/* head_box */
.form_item:first-child .head_box {
  border-top: 1px solid var(--site_color1);
}

.form_item .head_box {
  width: 40%;
  border-bottom: 1px solid var(--site_color1);
  display: flex;
  align-items: center;
}

/* 必須 */
.form_item .head_box p.must {
  padding: 6px 10px;
  background-color: var(--site_color1);
  border-radius: 10px;
  margin-left: 15px;
  white-space: nowrap;
  font-size: calc(12px + 2 * (100vw - 320px) / 1046);
  color: #ffffff;
}

/* エラー文 */
.form_item .element_box p.errors {
  color: #dc0000;
  margin-top: 5px;
}

/* element_box */
.form_item:first-child .element_box {
  border-top: 1px solid #7d7d7d;
}

.element_box {
  width: 60%;
  border-bottom: 1px solid #7d7d7d;
  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: 40%;
  min-width: 200px;
  padding: 1.464128843vw;
  background-color: var(--site_color1);
  text-align: center;
  display: block;
  border-radius: 5px;
  margin: auto;
  margin-top: 5.856515373vw;
  cursor: pointer;
  transition: all 0.5s;
  color: #ffffff;
}
@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: 15px;
  background-color: #ecedf2;
  border-radius: 5px;
  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: 15px;
  background-color: #ecedf2;
  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 {
    flex-direction: column;
  }

  .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;
  }
}