#m-feature {
    padding: 95px 0 100px 0;
    background-color: #FEF2E2;
}
#m-feature .block {
    width: 75%;
    max-width: 1280px;
    margin: auto;
}
#m-feature .block .content {
    width: 100%;
    display: flex;
    justify-content: space-between;
}
#m-feature .block .content h2 {
    writing-mode: vertical-rl;
    font-size: 40px;
}
#m-feature .block .feature {
    width: 89%;
}
#m-feature .block .content .item {
    width: 100%;
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}
#m-feature .block .content .item p {
    line-height: 2;
}
#m-feature .block .content .item img {
    width: 26.1%;
    margin-right: 7%;
}
#m-feature .block .recommend {
    width: 90.6%;
    margin: auto;
}
#m-feature .block .recommend img {
    width: 100%;
}
@media screen and (max-width: 768px) {
    #m-feature {
        padding: 50px 0;
    }
    #m-feature .block {
        width: calc(100% - 40px);
    }
    #m-feature .block .content {
        justify-content: flex-start;
    }
    #m-feature .block .content h2 {
        font-size: 25px;
    }
    #m-feature .block .feature {
        width: 68%;
        margin: auto;
        max-width: 511px;
    }
    #m-feature .block .content .item {
        width: 100%;
        flex-direction: column;
        margin-bottom: 45px;
    }
    #m-feature .block .content .item p {
        line-height: 1.5;
        font-size: 15px;
    }
    #m-feature .block .content .item img {
        width: 100%;
        margin-right: 0;
        margin-bottom: 17px;
    }
    #m-feature .block .recommend {
        width: 100%;
    }
}

#m-nature_material {
    padding: 100px 0 30px 0;
    background-color: #fff;
}
#m-nature_material h2 {
    display: flex; /* 文字と横線を横並び */
    justify-content: center;
    text-align: center;
    align-items: center;
    font-size: 30px;
    color: #262D35;
    margin-bottom: 60px;
}
#m-nature_material h2::before {
    content: '';
    width: 120px;
    height: 1px;
    background-color: #262D35;
    margin-right: 40px;
}
#m-nature_material h2::after {
    content: '';
    width: 120px;
    height: 1px;
    background-color: #262D35;
    margin-left: 40px;
}
#m-nature_material .content {
    width: 72%;
    max-width: 1000px;
    margin: auto;
}
#m-nature_material .content .box {
    margin-bottom: 55px;
}
#m-nature_material .content .box h3 {
    font-size: 32px;
    margin-bottom: 35px;
}
#m-nature_material .content .box .flex {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 35px;
}
#m-nature_material .content .box .flex img {
    display: block;
    width: 31%;
    margin: 0 1%;
}
#m-nature_material .content .box .flex .item .txt {
    border-right: 1px solid #262C35;
    padding: 0 30px;
    display: flex; 
    flex-direction: column;
    justify-content: flex-start;
}
#m-nature_material .content .box .flex .item .txt dl {
    flex-grow: 1;
    padding-bottom: 20px;
}
#m-nature_material .content .box table tr {
    display: flex;
}
#m-nature_material .content .box table th {
    width: 33.3%;
    padding: 0 20px 30px 20px;
    text-align: left;
    font-weight: normal;
    line-height: 2;
    border-right: solid 1px #262C35;
}
#m-nature_material .content .box table tr th:nth-child(3) {
    border: none;
}
#m-nature_material .content .box table th strong {
    font-weight: bold;
}
@media screen and (max-width: 768px) {
    #m-nature_material {
        padding: 50px 0 0 0;
    }
    #m-nature_material h2 {
        font-size: 20px;
        margin-bottom: 50px;
    }
    #m-nature_material h2::before {
        width: 75px;
        margin-right: 20px;
    }
    #m-nature_material h2::after {
        width: 75px;
        margin-left: 20px;
    }
    #m-nature_material .content {
        width: 77%;
    }
    #m-nature_material .content .box {
        margin-bottom: 32px;
    }
    #m-nature_material .content .box h3 {
        font-size: 32px;
        text-align: center;
    }
    #m-nature_material .content .box .item {
        margin-bottom: 30px;
    }
    #m-nature_material .content .box .item .image {
        width: 100%;
        margin-bottom: 30px;
    }
    #m-nature_material .content .box .item .detail-btn {
        position: relative;
        background-color: #F2F2F2;
        text-align: center;
        font-size: 17px;
        font-weight: bold;
        padding: 12px 0;
        margin-bottom: 35px;
    }
    #m-nature_material .content .box .item .detail-btn .add {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        right: 15px;
        width: 14px;
    }
    #m-nature_material .content .box .item .detail-btn .add img {
        transition: all 0.4s ease;
    }
    #m-nature_material .content .box .item.open .detail-btn .add img {
        transform: rotate(45deg);
    }
    #m-nature_material .content .box .item .txt {
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: max-height 0.4s ease, opacity 0.3s ease;
    }
    #m-nature_material .content .box .item.open .txt {
        max-height: 1000px;
        opacity: 1;
    }
    #m-nature_material .content .box .txt dl {
        margin-bottom: 34px;
    }
    #m-nature_material .content .box .txt dt {
        font-weight: bold;
        font-size: 17px;
        margin-bottom: 10px;
    }
    #m-nature_material .content .box .txt dd {
        font-size: 17px;
        line-height: 2;
    }
}