<!--アコーディオンここから-->
details {
  border: 1px solid #ccc;
}
details:not(:last-child) {
  margin-bottom: 20px;
}

/**
 * list-style: none; ←デフォルト三角削除（Chrome非対応）
 * cursor: pointer; ←カーソルをポインターに
**/
details summary {
  list-style: none;
  cursor: pointer;
  padding: 20px;
  background: #e4e4e4;
  color: #242323;
  font-size: 1rem;
  font-weight: normal;
}
/**
 * Chrome用のデフォルト三角削除
**/
details summary::-webkit-details-marker {
  display: none;
}
/**
 * Font Awesomeのプラスアイコン使用
**/
details summary::before {
  font-family: "Font Awesome 5 Free";
  content: "\f358";
  margin-right: 20px;
}
/**
 * アコーディオンがオープン時はマイナスアイコンに変更
**/
details[open] summary::before {
  content: "\f35b";
}

details p {
  margin: 0;
  padding: 20px;
}
<!--アコーディオンここまで-->
.input-prepend.input-append input {
  font-size: 24px;
  padding-top: 11px;
  padding-bottom: 11px;
  width: 100px;
  text-align: right;
}

.product {
  margin-bottom: 40px;
}

.product_area {
  border-bottom: 1px solid #333;
  padding-bottom: 40px;
}
.product_area_left {
  float: left;
  padding: 0;
}
.product_area_right {
  float: right;
  padding: 0;
}

.product_tabs {
  border-bottom: 1px solid #333;
}
.product_tab {
  display: inline-block;
  background-color: #f6f6f6;
  text-align: center;
  padding: 10px 0;
}
.product_tab.active {
  background-color: #333;
}
.product_tab a {
  display: block;
  font-size: 14px;
  font-weight: bold;
  letter-spacing: 0.1em;
}
.product_tab.active a,
.product_tab.active a:hover {
  color: #fff;
  text-decoration: none;
}

.product_panel {
  display: none;
}
.product_panel.active {
  display: block;
}
.product_panel_image,
.product_panel_review {
  text-align: center;
}

.product_belong_lists {
  margin: 40px 0 20px;
  font-size: 12px;
}
.product_belong_list {
  padding: 0 2px;
}
.product_belong_list:first-child {
  padding: 0 2px 0 0 ;
}

.product_name {
  margin: 0;
  font-size: 20px;
  font-weight: normal;
}
.product_model {
  margin: 0;
  font-size: 10px;
}

.product_img {
  margin-bottom: 60px;
}
.product_img_main img {
  display: block;
  margin: 0 auto;
  height: auto;
}
.product_img_thumb li {
  float: left;
  margin-top: 10px;
  cursor: pointer;
}
.product_img_thumb_img {
  max-width: 100%;
  width: auto;
  height: auto;
  border: 1px solid #ccc;
}
.thumb_active {
  border: 1px solid #333;
}

.together_product_lists {
  margin-top: 20px;
  font-size: 12px;
}
.together_product_list {
  text-align: center;
}

.product_price_area {
  margin: 20px 0 0;
}
.product_regular_price {
  margin: 0 0 5px;
  font-size: 12px;
}
.product_price {
  margin: 0;
  font-size: 20px;
}
.product_price_discount {
  color: #cf0400;
}
.product_discount_rate {
  color: #cf0400;
  font-size: 20px;
}
.product_price_establish {
  margin: 0;
  font-size: 10px;
}
.product_stock_str {
  margin: 20px 0 0;
  font-size: 12px;
}

.product_cart_area {
  background-color: #f6f6f6;
  margin: 30px 0;
  padding: 10px 20px 20px;
  font-size: 12px;
}
.product_cart_table_box {
  margin-top: 20px;
  background-color: #fff;
  font-size: 12px;
}
.product_cart_table_box label {
  font-size: 12px;
}
.product_cart_select_box {
  margin: 5px 0;
}
.product_cart_select_name {
  padding-top: 10px;
  padding-bottom: 5px;
}
.product_cart_select {
  border: 1px solid #333;
  height: 40px;
}
.text-titles-list__unit {
  margin: 5px 0;
}
.text-titles-list__unit dl {
  margin: 0;
}
.text-titles-list__name {
  padding-top: 10px;
  padding-bottom: 5px;
  font-weight: normal;
}
.text-titles-list__detail-text {
  border: 1px solid #333;
  height: 40px;
}
.product_cart_order {
  margin: 5px 0;
}
.product_cart_init_num {
  width: 20%;
  height: 30px;
  text-align: right;
  float: left;
}
.product_cart_unit {
  float: left;
  padding-top: 12px;
  padding-left: 20px;
}
.product_cart_init {
  display: none;
}

.sizeguide_table_box {
  border-top: 1px solid #ccc;
  padding-top: 40px;
  margin-top: 20px;
}

.sizeguide_table {
  margin: 20px 0;
}

.btn-addcart,
.btn-reviews {
  border: none;
  margin-top: 30px;
  padding: 18px 0;
  /* background-color: #333; */
  background-color: #000;
  font-size: 18px;
  color: #fff;
  *background-color: #333;
  letter-spacing: 0.1em;
}
.btn-addcart:hover,
.btn-addcart:focus,
.btn-addcart:active,
.btn-reviews:hover,
.btn-reviews:focus,
.btn-reviews:active {
  background-color: #666;
  color: #fff;
  *background-color: #666;
}
.btn-addcart i,
.btn-addcart-quick i,
.btn-reviews i {
  margin-right: 5px;
  vertical-align: -25%;
}

.btn-addcart-quick,
.btn-membersonly {
  margin-top: 20px;
  padding: 10px 0;
  font-size: 18px;
  letter-spacing: 0.1em;
}
.btn-addcart-quick {
  border: none;
  background-color: #007fff;
  color: #fff;
  *background-color: #007fff;
}
.btn-addcart-quick:hover,
.btn-addcart-quick:focus,
.btn-addcart-quick:active {
  background-color: #4ca5ff;
  color: #fff;
  *background-color: #4ca5ff;
}

.btn-soldout {
  border: none;
  margin-top: 20px;
  padding: 18px 12px;
  background-color: #cf0400;
  font-size: 18px;
  color: #fff;
  *background-color: #cf0400;
  letter-spacing: 0.1em;
}
.btn-soldout.disabled,
.btn-soldout[disabled] {
  background-color: #cf0400;
  color: #fff;
}

.btn_pis_width,
.btn_revies_width {
  width: 300px;
}

.stock_error {
  margin: 0;
  text-align: center;
  color: #cf0400;
}

.product_related_lists {
  margin: 20px 0 0;
  font-size: 12px;
}
.product_related_lists_review {
  margin: 30px 0 0;
}
.product_related_list {
  padding: 2px 0;
}

.product_related_lists i {
  vertical-align: -40%;
}

.product_explain,
.product_img_sub,
.product_reviews {
  line-height: 1.8;
  margin-top: 40px;
}

.product_img_sub li {
  text-align: center;
  padding-bottom: 10px;
}

.product_text_not {
  text-align: center;
}

.reviewlist_datas {
  overflow: hidden;
  zoom: 1;
  margin-bottom: 10px;
  line-height: 1.2;
}

.icon_star {
  float: left;
  /* 星5個での設定は下記を有効にする */
  width: 75px;
  overflow: hidden;
}

.icon_star img {
  max-width: inherit;
}

.review_poster li {
  float: left;
  margin-left: 10px;
}

.review_poster li {
  list-style: none;
}

.reviewlist:first-child {
  border-top: none;
}

.reviewlist {
  padding-top: 20px;
  margin-top: 20px;
  border-top: 1px solid #ccc;
  text-align: left;
}

.review_ttl,
.shopcomment_ttl {
  font-size: 14px;
  font-weight: bold;
  margin-bottom: 10px;
}

.review_img {
  float: right;
  margin: 0 0 10px 10px
}

.reviewlist_content {
  overflow: hidden;
  zoom: 1;
}

.shopcomment {
  margin-top: 10px;
  margin-bottom: 10px;
  background: #eee;
  padding: 15px;
}

@media (min-width: 980px) {
  .product_area_left {
    width: 540px;
    float: left;
    padding: 0;
  }
  .product_area_right {
    width: 400px;
    float: right;
    padding: 0;
  }
}

@media (min-width: 768px) {
  .product_explain,
  .product_img_sub,
  .product_reviews {
    padding: 0 1%;
  }
}

@media (max-width: 980px) {
  .contents_detail {
    width: 100%;
    float: none;
    padding: 0;
  }

  .product_area_left,
  .product_area_right {
    padding-right: 1%;
    padding-left: 1%;
  }
}

@media (max-width: 768px) {
  .product_area_right {
    float: none;
    padding: 0;
  }
  .product_img {
    margin-bottom: 30px;
  }

  .product_detail_area,
  .product_social_lists {
    padding: 0 10px;
  }
  .product_tab a {
    font-size: 12px;
  }
  .product_explain,
  .product_img_sub {
    font-size: 12px;
    padding: 0 10px 60px;
  }
  .product_reviews {
    font-size: 12px;
    padding: 0 10px 20px;
  }
  .product_reviews_btn {
    padding-bottom: 60px;
  }
  .together_product_lists {
    padding: 0 10px 30px;
  }

  .btn_pis_width,
  .btn_revies_width {
    width: 100%;
  }
}


.customPatternSelecterWrap {
  margin: 0 0 24px;
  padding: 0;
}
.customPatternSelecterWrap.disabled {
  opacity: 0.5;
  pointer-events: none;
}
.customPatternSelecterWrap dd {
  background-color: rgba(0,0,0,.05);
  border-radius: 4px;
  margin: 0;
  padding: 4px 0;
}

.customPatternSelecter {
  /*
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  */
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  grid-auto-rows: minmax(88px, auto);

  margin: 0;
  padding: 8px;
  width: calc(100% - 8px * 2);
}
.customPatternSelecter.type-limitedPattern {
  display: flex;
  flex-wrap: wrap;
  gap: 2%;
}
.customPatternSelecter.type-circle {
  grid-template-columns: repeat(3, 1fr);
}

.customPatternSelecter_label {
  font-size: 14px;
  font-weight: normal;
  margin: 0 0 16px;
  padding: 0;
}
.customPatternSelecter_label span {
  display: block;
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 4px;
}

.customPatternSelecter_typeElem,
.customPatternSelecter_salonElem,
.customPatternSelecter_elem,
.customPatternSelecter_optionElem {
  background-color: #FFF;
  border: 1px solid #CCC;
  border-radius: 5px;
  cursor: pointer;
  flex-basis: 64px;
  flex-shrink: 0;
  font-size: 11px;
  line-height: 1.2;
  list-style: none;
  padding: 0 0 6px;
  text-align: center;
  transition: all 800ms ease-out;
  width: 70px;
}
.customPatternSelecter_optionElem,
.customPatternSelecter_salonElem {
  min-height: 75px;
  display: flex;
  align-items: center;
}
.customPatternSelecter_salonElem {
  flex-basis: 80px;
}
.customPatternSelecter_optionElem.isOptionDirect {
  flex-wrap: wrap;
  justify-content: center;
}
.customPatternSelecter_optionElem.isOptionDirect span {
  width: 100%;
  text-align: center;
}
.customPatternSelecter_elem {
  width: auto;
}
.customPatternSelecter_typeElem:hover,
.customPatternSelecter_salonElem:hover,
.customPatternSelecter_elem:hover,
.customPatternSelecter_optionElem:hover {
  background-color: #dbf1f5;
  box-shadow: 1px 1px 2px rgba(0,0,0,.3);
  transition: all 150ms ease-out;
}
.customPatternSelecter_typeElem,
.customPatternSelecter_salonElem {
  font-size: 14px;
  font-weight: bold;
  padding: 6px 0;
  width: 96px;
}
.customPatternSelecter_typeElem::after {
  background: url(https://img21.shop-pro.jp/PA01493/601/etc/patternType.jpg?cmsp_timestamp=20221217103032) no-repeat 0 0;
  background-size: 112px;
  content: '';
  display: inline-block;
  height: 72px;
  mix-blend-mode: multiply;
  width: 96px;
}
.type-circle .customPatternSelecter_typeElem::after {
  background-image: url(https://img21.shop-pro.jp/PA01493/601/etc/circle.jpg?cmsp_timestamp=20230129075208);
}
.type-utane .customPatternSelecter_typeElem::after {
  background-image: url(https://img21.shop-pro.jp/PA01493/601/etc/utane.jpg?cmsp_timestamp=20230129075208);
}
.type-boomerang .customPatternSelecter_typeElem::after {
  background-image: url(https://img21.shop-pro.jp/PA01493/601/etc/boomerang.jpg?cmsp_timestamp=20230129075208);
}
.type-triangle .customPatternSelecter_typeElem::after {
  background-image: url(https://img21.shop-pro.jp/PA01493/601/etc/triangle.jpg?cmsp_timestamp=20230129075208);
}
.type-square .customPatternSelecter_typeElem::after {
  background-image: url(https://img21.shop-pro.jp/PA01493/601/etc/square.jpg?cmsp_timestamp=20230129075208);
}
.type-2color .customPatternSelecter_typeElem {
  flex-basis: 100px;
}
.type-2color .customPatternSelecter_typeElem,
.type-2color .customPatternSelecter_typeElem.isSelected {
  padding: 24px 0;
}
.type-2color .customPatternSelecter_typeElem::after,
.type-kotatsu .customPatternSelecter_typeElem::after {
  background-image: none;
  display: none;
}
.type-kotatsu .customPatternSelecter_typeElem {
  display: flex;
  flex-basis: 150px;
  align-items: center;
  justify-content: center;
  width: 150px;
}

.type-limitedPattern .customPatternSelecter_elem {
  display: flex;
  font-size: 13px;
  font-weight: bold;
  align-items: center;
  justify-content: center;
  width: auto;
}

.customPatternSelecter_typeElem-1::after {
  background-position: top center;
  background-size: 112px;
}
.customPatternSelecter_typeElem-2::after {
  background-position: center center;
  background-size: 112px;
}
.customPatternSelecter_typeElem-3::after {
  background-position: bottom center;
  background-size: 112px;
}
.customPatternSelecter_elem {
  background-color: #FFF;
  font-feature-settings: "palt";
  min-height: 88px;
}
.customPatternSelecter_elem.isDisabled:not(.isSelected) {
  opacity: 0.4;
  background-color: #929292;
}
.customPatternSelecter_elem.isDisabled:not(.isSelected) img {
  opacity: 0.4;
}

.customPatternSelecter_img {
  margin-bottom: 4px;
  width: 100%;
}
.customPatternSelecter_kana {
  color: rgb(103, 103, 103);
  font-size: 10px;
}
.customPatternSelecter_typeElem.isSelected,
.customPatternSelecter_salonElem.isSelected,
.customPatternSelecter_elem.isSelected,
.customPatternSelecter_optionElem.isSelected {
  background-color: #d2f5fb;
  border: 4px solid #37cbe8;
  padding: 0 0 4px;
}
.customPatternSelecter_elem.isSelected.isEmbroiderySide,
.customPatternSelecter_elem.isSelected.isFrontSide,
.customPatternSelecter_elem.isSelected.isBackSide {
  position: relative;
}
.customPatternSelecter_elem.isSelected.isEmbroiderySide::before {
  content: '刺繍面';
  display: inline-block;
  font-size: 11px;
  background-color: #37cbe8;
  color: #111;
  padding: 2px;
  border-radius: 10px;
  position: absolute;
  top: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
}

.customPatternSelecter_elem.isSelected.isFrontSide::before,
.customPatternSelecter_elem.isSelected.isBackSide::before {
  content: '表面';
  display: inline-block;
  font-size: 11px;
  background-color: #37cbe8;
  color: #111;
  padding: 2px;
  border-radius: 10px;
  position: absolute;
  top: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
}
.customPatternSelecter_elem.isSelected.isBackSide::before {
  content: '裏面';
}


.customPatternSelecter_pinterestLink {
  margin: 8px 0;
}
.customPatternSelecter_pinterestLink a {
  display: inline-block;
  font-size: 13px;
  padding: 2px 8px;
  background-color: #fff;
  border:  1px solid #37cbe8;
  color: #37cbe8;
  border-radius: 12px;
}

.product_extra_cart_btn {
  margin-bottom: 30px;
}
.customPatternSelecter_cartButton {
  bottom: 8px;
  display: block;
  left: 0;
  position: sticky;
}
.customPatternSelecter_cartButton.is_upper {
  bottom: 100px;
}
.c-btn-cart:disabled {
  background: rgb(140, 140, 140);
  opacity: 0.6;
  pointer-events: none;
}

.customPatternSelecter_optionElem {
  font-size: 14px;
  font-weight: bold;
  padding: 6px 0;
  margin: 0 0 6px;
  width: 48%;
  flex-basis: 48%;
  box-sizing: border-box;
}
.customPatternSelecter_optionElem.isSelected {
  padding: 6px 0;
}
.customPatternSelecter_optionElem span {
  font-size: 11px;
  font-weight: normal;
}


@media (max-width: 375px) {
  .customPatternSelecter {
    padding: 4px;
    width: calc(100% - 4px * 2);
    gap: 8px;
  }
  .customPatternSelecter_label {
    font-size: 13px;
  }
  .customPatternSelecter_typeElem.isSelected,
  .customPatternSelecter_elem.isSelected {
    border: 4px solid #37cbe8;
  }
}

/* お気に入り */
.product__fav-item {
  margin-top: 24px;
  display: none;
}
.product__fav-item button {
  padding: 0;
  cursor: pointer;
  transition: .2s;
  color: #999;
  border: 0;
  outline: none;
  background: transparent;
}
.product__fav-item .fav-items {
  color: #ff7373;
}
.product__fav-item svg {
  width: 20px;
  height: 20px;
  vertical-align: -.35em;
  fill: currentColor;
}

@media (max-width: 480px) {
  .product__fav-item {
    display: block;
  }
}
.reviewlist_datas {
  overflow: hidden;
  zoom: 1;
  margin-bottom: 10px;
}
.icon_star {
  float: left;
  width: 75px;
  overflow: hidden;
}
.icon_star img {
  max-width: inherit;
}
.review_poster li {
  float: left;
  margin-left: 10px;
}
.review_poster li {
  list-style: none;
}
.reviewlist {
  padding-bottom: 15px;
  margin-bottom: 15px;
  border-bottom: 1px dotted #ccc;
}
.review_ttl,
.shopcomment_ttl {
  font-size: 14px;
  font-weight: bold;
  margin-bottom: 10px;
}
.review_img {
  float: right;
  margin: 0 0 10px 10px
}
.reviewlist_content {
  overflow: hidden;
  zoom: 1;
}
.shopcomment {
  margin-top: 10px;
  margin-bottom: 10px;
  background: #eee;
  padding: 15px;
  border-radius: 6px;
}