#concept .flex {
    display: flex;
    align-items: center;
    margin-bottom: 70px;
}
#concept .flex .image {
    position: relative;
    width: 46.8%;
    margin-bottom: 94px;
    margin-right: 3%;
}
#concept .flex .image .inline {
    position: absolute;
    top: 50px;
    color: #fff;
    font-family: "Zen Old Mincho", serif;
    width: 100%;
}
#concept .flex .image.black .inline {
    color: #262D35;
}
#concept .flex .image .inline .ttl {
    display: flex;
    align-items: center;
    justify-content: center;
}
#concept .flex .image .ttl h2 {
    font-size: 70px;
    line-height: 0.7;
    text-align: left;
}
#concept .flex .image .ttl h2 span {
    font-size: 46px;
}
#concept .flex .image .ttl p {
    writing-mode: vertical-rl;
    text-orientation: mixed; 
    font-feature-settings: "pkna"; 
    font-weight: 600;
    font-size: 30px;
}
#concept .flex .image .bubble {
    position: absolute;
    right: 0;
    bottom: -94px;
    width: 80%;
}
#concept .flex .image .bubble img {
    width: 100%;
}
#concept .flex .txt {
    width: 34.3%;
    margin-left: 3%;
}
#concept .flex .txt p {
    line-height: 2;
    margin-bottom: 90px;
    font-weight: 500;
}
#concept .content {
    display: flex;
    width: 78%;
    margin: 0 auto;
}
#concept .content-sp {
    display: none;
}
#concept .content .item {
    width: 31.7%;
    margin-right: 2.5%;
}
#concept .content .item:nth-child(3) {
    margin-right: 0;
}
#concept .content .item img {
    width: 100%;
    margin-bottom: 12px;
}
#concept .content .item p {
    font-size: 14px;
    font-weight: bold;
    text-align: center;
}
#concept .flex .txt .nav-btn {
    max-width: 370px;
    margin: auto;
    font-weight: 900;
}
#concept .flex .txt .nav-btn img {
    right: 6px;
}
@media screen and (max-width: 768px) {
    #concept .flex {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 70px;
        overflow: hidden;
    }
    #concept .flex .image {
        position: relative;
        width: calc(100% - 10px);
        margin-bottom: 93px;
        margin-right: 0;
    }
    #concept .flex .image .bubble {
        width: 120%;
        margin: auto;
    }
    #concept .flex .image .bubble {
        right: -10%;
        bottom: -45px;
    }
    #concept .flex .txt {
        width: calc(100% - 40px);
        margin: 0 auto;
        text-align: center;
        font-size: 14px;
    }
    #concept .flex .txt p {
        margin-bottom: 45px;
    }
    #concept .flex .txt .nav-btn {
        width: 100%;
        margin: auto;
    }
    #concept .content {
        display: none;
    }
    #concept .content-sp {
        display: block;
    }
    #concept .content-sp img {
        margin-bottom: 10px;
    }
    #concept .content-sp p {
        font-weight: bold;
        font-size: 11px;
        text-align: center;
    }
    /* 基本は薄くする */
    .content-sp .swiper-slide img,
    .content-sp .swiper-slide p {
        opacity: 0.4;
        transition: opacity 0.3s ease;
    }

    /* アクティブ・前・次だけを強調 */
    .content-sp .swiper-slide-active img,
    .content-sp .swiper-slide-active p {
        opacity: 1;
    }
}

#c-material, #c-design {
    background-color: #FEF2E2;
    padding: 100px 0 90px 0;
}
#c-life-style, #c-area {
    background-color: #fff;
    padding: 100px 0 75px 0;
}
#c-area {
    padding: 100px 0 30px 0;
}
#c-material .nav-btn {
    width: 370px;
    padding: 10px 50px 10px 23px;
}
#c-life-style .nav-btn,
#c-design .nav-btn {
    padding: 10px 0;
    text-align: center;
}