.c-core {
    margin-bottom: 5rem;
}

.c-core .c-title02 {
    color: #000936;
}

.c-core .list {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    flex-wrap: wrap;
}

.c-core .list .item {
    border-radius: 35px 35px 0 35px;
    background: #fff;
    padding: 10px;
    background: #E9E9E9;
    position: relative;
    overflow: hidden;
    width: 19%;
    margin: 0 0.5%;
    text-align: center;
}

.c-core .list .item:before {
    position: absolute;
    width: 55px;
    height: 55px;
    content: "";
    background: url(../images/bg_border.png) no-repeat;
    background-size: auto;
    left: 0;
    top: 0;
}

.c-core .item_white {
    background: #fff;
    border-radius: 35px 35px 0 35px;
    padding: 10px;
    height: 100%;
    position: relative;
}

.c-core .text {
    color: #000936;
    font-weight: 500;
    margin: .5rem;
}

.c-core .item_white img {
    max-height: 100px;
    width: auto;
    margin: 1rem;
}

#idx_intro {
    padding: 5rem 0 0;
    margin-bottom: 5rem;
}

#idx_system {
    padding: 15rem 0 0;
    margin-bottom: 5rem;
}

#box_tile {
    margin-bottom: 5rem;
}

#box_stone {
    padding: 0;
    margin-bottom: 10rem;
}

#box_stone .block:not(:last-child) {
    margin-bottom: 12rem;
}

#idx_service {
    padding: 15rem 0;
    margin-bottom: 2rem;
}

#idx_construction {
    padding: 0 0 5rem;
    margin-bottom: 5rem;
}

#idx_news {
    padding: 0 0 5rem;
    margin-bottom: 5rem;
}

#idx_contact {
    padding: 0;
}

.c-title02 {
    margin: 0 0 3rem;
}

@media screen and (max-width: 1024px) {
    #idx_intro {
        padding-top: 10rem
    }

    #idx_system {
        padding-top: 10rem;
    }

    .c-title03 {
        margin-bottom: 2rem;
    }

    #box_stone .block:not(:last-child) {
        margin-bottom: 10rem;
    }

    #box_stone {
        margin-bottom: 8rem;
    }

    #idx_service {
        padding: 10rem 0;
    }

    #idx_construction {
        margin-bottom: 2rem;
    }

    #idx_news {
        margin-bottom: 2rem;
    }
}

@media screen and (max-width: 767px) {
    /* .m-mainv {
        padding: 10rem 0 20px;
    } */

    #idx_intro {
        padding-top: 5rem;
    }

    #box_stone .block:not(:last-child) {
        margin-bottom: 8rem;
    }

    #idx_construction {
        padding-bottom: 2rem;
    }

    #idx_news .c-title02 {
        margin-bottom: 1rem;
    }

    .single-block .sec h3 {
        font-size: 18px;
    }

    .single-block .sec:not(:last-child) {
        margin-bottom: 30px;
    }

    .single-block .sec p:not(:last-child) {
        margin-bottom: 10px;
    }

    .c-core .list {
        justify-content: center;
    }

    .single-block .sec figure {
        margin-top: 20px;
    }

    .c-core .list .item {
        width: calc(50% - 20px);
        margin: 1rem;
    }
}

@media screen and (max-width: 567px) {
    #idx_intro {
        padding-top: 2rem;
    }

    #idx_system {
        padding-top: 8rem;
    }
}