.option_title {
    text-align: center;
    padding: 3rem 0 6rem;
    background: url(/img/option_bk_img.gif) no-repeat center -86px;
    /* background-size: 60%; */
}
.option_title h2.f_24 {
    font-size: 52px;
}

.option_title .title_sab {
    font-size: 24px;
    width: 35%;
    margin: 0 auto 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #000;
}

/* シャワーモード */
.shower_mode {
    background: linear-gradient(to right, #000000, #333333);
}

.shower_box {
    border-bottom: 1px solid #717171;
}

.shower_cat, .detail_list {
    margin: 0 auto;
    gap: 2rem;
    flex-wrap: wrap;
}

.shower_cat > picture {
    flex: 1; /* 1:2 の比率の 1 部分 */
  }
  
  .shower_cat > div {
    flex: 2; /* 1:2 の比率の 2 部分 */
  }

  .shower_cat > div h2,
  .shower_mode_text {
    color: var(--font-color_ff); /* デフォルトcssから参照 */
}
.shower_title {
    font-size: 24px;
    font-weight: normal;
    margin-bottom: 1rem;
}
.shower_mode_text {
    line-height: 1.8;
}

/* オプション 詳細情報 */
.option_detail_title {
    margin: 2rem auto;
    text-align: center;
    width: 30%;
    background-color: #fff;
    padding: .5rem 0;
}
.detail_list {
    margin-bottom: 5rem;
}

.detail_list section {
    background-color: #fff;
    width: calc(92% / 2);
}
section.detail_list_2 {
    background-color: unset;
    flex-wrap: wrap;
}

.detail_list h3 {
    font-weight: normal;
    color: var(--font-color_ff);
    background-color: #B3B3B3;
    padding: 0 1rem 0.3rem;
    border-radius: 5rem;
    width: 60%;
    margin: -17px auto 2rem auto;
    text-align: center;
    font-size: clamp(16px, 2vw, 20px);
    position: relative;
}

.detail_list__box picture{
    border-bottom: 4px solid #b3b3b3;
}


.detail_list h4, .detail_list__sab,.re_doog {
    padding: 0 2rem 2rem;
}
.detail_list h4 {
    font-weight: normal;
    line-height: 1.8;
}

.detail_list__sab dt {
    padding: 0 0 0.3rem;
    border-bottom: 4px dotted #4d4d4d;
    font-size: 18px;
}
.detail_list__sab dd {
    margin-bottom: 3rem;
}

.detail_list_2 > div {
    margin-bottom: 5rem;
    background-color: #fff;
}
.detail_list_2 > div:nth-of-type(2) {
    margin-bottom: 0;
}

@media (width < 750px) {
    .option_title {
        background-size: cover;
    }
    .option_title h2.f_24 {
        font-size: 30px;
    }
    .option_title .f_24 {
        font-size: 14px;
    }
    .option_detail_title{
        width: 90%;
    }
    .option_title .title_sab,
    .detail_list h3 {
        width: 80%;
    }
    .f_18 {
        font-size: 15px;
    }
    .w60 {
        width: 100%;
    }
    .shower_cat, .detail_list{
        flex-wrap: wrap;
    }
    .shower_cat > picture,
    .shower_cat > div,
    .detail_list section {
        flex: auto;
    }
    .shower_cat > picture,
    .shower_cat > div {
        text-align: center;
    }
}