.product-introduction {
    border-bottom: solid 1px #d4e1e7;
    padding-bottom: 40px;
}
.product-introduction-main {
    padding: 16px 0;
    margin-bottom: 16px;
}
.product-introduction-main-info {
}
.product-introduction-main-info p {
    font-size: 12px; font-size: 1.2rem;
    line-height: 24px; line-height: 2.4rem;
}
.product-introduction-main-info p a {
    font-weight: 700;
}
.product-introduction-main-info p a:hover {
    text-decoration: underline;
}
.product-introduction-main-image {
    max-width: 460px;
    padding: 0 20px;
    margin: 0 auto;
    text-align: center;
}
.product-introduction-main-image img {
    margin: 7px 0;
}

.product-introduction-pickup {
    background-color: #eaf2fa;
    padding: 12px 16px;
}
.product-introduction-pickup p {
    font-size: 12px; font-size: 1.2rem;
    line-height: 24px; line-height: 2.4rem;
}



#article-nav {}
#article-nav ul {
    padding-bottom: 0px;
    border-radius: 10px;
    overflow: hidden;
}
#article-nav ul li {
    overflow: hidden;
    display: flex;
}
#article-nav ul li+li {
    border-top: solid 1px #b0c7de;
}
#article-nav ul li a {
    flex-grow: 2;
    display: flex;
    align-items: center;
    min-height: 46px;
    background-color: #2f7fd0;
    color: #fff;
    font-size: 12px; font-size: 1.2rem;
    line-height: 20px; line-height: 2.0rem;
    font-weight: 700;
    padding: 5px 34px 7px 16px;
    position: relative;
    -webkit-transition: background .2s;
    transition: background .2s;
}
#article-nav ul li a:before,
#article-nav ul li a:after {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto 0;
}
#article-nav ul li a:before {
    width: 14px;
    height: 14px;
    background-color: #fff;
    border-radius: 50%;
    right: 10px;
}
#article-nav ul li a:after {
    width: 3px;
    height: 3px;
    border: solid 1px #2f7fd0;
    border-width: 0 1px 1px 0;
    right: 15px;
    bottom: 2px;
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
    -webkit-transition: transform .2s;
    transition: transform .2s;
}
#article-nav ul li a:hover {
    background-color:#368ad6;
}
#article-nav ul li a:hover:after {
    -webkit-transform: rotate(405deg);
    transform: rotate(405deg);
}



#articles {}
.article-group-title {
    font-size: 16px; font-size: 1.6rem;
    line-height: 26px; line-height: 2.6rem;
    font-weight: 700;
    color: #2f7fd0;
    background-color: #eaf2fa;
    padding: 7px 12px 9px 12px;
    margin-top: 20px;
}
.article-group {
    margin: -12px;
    padding: 12px 0;
}
.article {
    padding: 16px;
    margin: 12px;
    border: solid 1px #d4e1e7;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}
.article-dataset-top {}
.article-dataset-bottom {}

.article-image {
    max-width: 234px;
    margin: 0 auto;
}
.article-logo-image {
    min-height: 50px;
    max-width: 234px;
    position: relative;
    margin: 4px auto;
}
.article-logo-image img {
    position: absolute;
    top: 50%;
    -webkit-transform: translate(0, -50%);
    transform: translate(0, -50%);
}
.article-caption {
    font-size: 12px; font-size: 1.2rem;
    line-height: 20px; line-height: 2.0rem;
    font-weight: 700;
}
.article-notes {
    font-size: 11px; font-size: 1.1rem;
    font-weight: 400;
    color: #777;
}
.article-notes-red {
    display: block;
    padding-top: 4px;
    color: #ff0000;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    margin: -4px;
    padding-top: 12px;
}
.article-tags li {
    font-size: 11px; font-size: 1.1rem;
    line-height: 17px; line-height: 1.7rem;
    padding: 2px 8px 4px 8px;
    margin: 4px;
    border-radius: 12px;
    white-space: nowrap;
    color: #2f7fd0;
    background-color: #eaf2fa;
}
.article-volume {
    font-size: 10px; font-size: 1.0rem;
    line-height: 16px; line-height: 1.6rem;
    text-align: center;
    color: #777777;
    margin-top: 14px;
}





@media (min-width: 480px)
{
    .article-group {
        display: flex;
        flex-wrap: wrap;
        margin: -6px;
    }
    .article {
        width: 50%; width: calc(50% - 12px);
        margin: 6px;
    }
}

@media (min-width: 640px)
{
    .product-introduction-main {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
    }
    .product-introduction-main-image {
        width: 50%;
        max-width: 460px;
        padding: 0 0 0 16px;
    }

    #article-nav ul {
        display: flex;
    }
    #article-nav ul li {
        width: 25%;
    }
    #article-nav ul li+li {
        border-top: none;
        border-left: solid 1px #b0c7de;
    }
}

@media (min-width: 768px)
{
    .product-introduction {
        padding-bottom: 70px;
    }
    .product-introduction-main {
        padding: 26px 0;
        margin-bottom: 26px;
    }
    .product-introduction-main-info {
        flex-basis: 468px;
    }
    .product-introduction-main-info p {
        font-size: 16px; font-size: 1.6rem;
        line-height: 34px; line-height: 3.4rem;
    }
    .product-introduction-main-image {
        min-width: 355px;
        max-width: 460px;
        padding: 0 20px;
    }
    .product-introduction-main-image img {
        margin: 7px 0;
    }

    .product-introduction-pickup {
        padding: 16px 26px 18px 26px;
    }
    .product-introduction-pickup p {
        font-size: 16px; font-size: 1.6rem;
        line-height: 34px; line-height: 3.4rem;
    }

    #article-nav {
        padding-bottom: 24px;
    }
    #article-nav ul li a {
        min-height: 56px;
        font-size: 16px; font-size: 1.6rem;
        line-height: 20px; line-height: 2.0rem;
        padding: 5px 34px 7px 24px;
    }
    #article-nav ul li a:before {
        width: 18px;
        height: 18px;
    }
    #article-nav ul li a:after {
        width: 5px;
        height: 5px;
        right: 16px;
        bottom: 2px;
    }

    .article-group-title {
        font-size: 22px; font-size: 2.2rem;
        line-height: 34px; line-height: 3.4rem;
        padding: 6px 24px 8px 24px;
        margin-top: 28px;
    }
    .article-group {
        margin: 0 -13px;
        padding: 13px 0;
    }
    .article {
        width: 50%; width: calc(50% - 26px);
        padding: 16px 28px;
        margin: 13px;
    }

    .article-caption {
        font-size: 16px; font-size: 1.6rem;
        line-height: 28px; line-height: 2.8rem;
    }
    .article-notes {
        font-size: 14px; font-size: 1.4rem;
    }
    .article-notes-red {
        padding-top: 4px;
    }

    .article-tags {
        margin: -6px;
        padding-top: 18px;
    }
    .article-tags li {
        font-size: 14px; font-size: 1.4rem;
        line-height: 20px; line-height: 2.0rem;
        padding: 3px 8px 5px 8px;
        margin: 6px;
        border-radius: 14px;
    }

    .article-volume {
        font-size: 13px; font-size: 1.3rem;
        line-height: 19px; line-height: 1.9rem;
        margin-top: 24px;
    }
}

@media (min-width: 960px)
{
    .article {
        width: 33.3%; width: calc(calc(100% / 3) - 26px);
    }
}





.article-default-price {
    font-size: 11px; font-size: 1.1rem;
    line-height: 17px; line-height: 1.7rem;
    text-align: right;
    margin: 5px 0 -6px 0;
    color: #555;
}
.article-sale-price {
    font-size: 16px; font-size: 1.6rem;
    line-height: 18px; line-height: 1.8rem;
    letter-spacing: 0;
    background-color: #f00;
    color: #fff;
    text-align: center;
    padding: 6px;
    margin: 12px 0 0 0;
}
.article-sale-price > span {
    display: inline-block;
}
.article-sale-price span:nth-child(1),
.article-sale-price span:nth-child(2) span {
    font-size: 11px; font-size: 1.1rem;
    margin: 0 3px;
    font-weight: normal;
}
.article-sale-price span:nth-child(2) {
    font-weight: 700;
    padding-top: 2px;
}
.article-name {
    font-size: 16px; font-size: 1.6rem;
    line-height: 20px; line-height: 2.0rem;
    font-weight: 700;
    padding: 16px 0 8px 0;
    margin-bottom: 12px;
    border-bottom: dashed 1px #d4e1e7;
}
.article-description {
    font-size: 12px; font-size: 1.2rem;
    line-height: 20px; line-height: 20px;
    color: #555;
    margin: -2px 0 0 0;
}
.article-sale-description {
    margin-right: -6px;
    margin-left: -6px;
}
.article-description span {
    display: inline-block;
    margin: 2px 6px;
    letter-spacing: 0;
}

.month {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 48px;
    height: 48px;
    line-height: 48px;
    border-radius: 50%;
    background-color: #f00;
    color: #fff;
    text-align: center;
}
.month span:nth-child(1) {
    font-size: 24px; font-size: 2.0rem;
    font-weight: 700;
    margin-left: 2px;
}
.month span:nth-child(2) {
    font-size: 12px; font-size: 1.2rem;
}

@media (min-width: 768px)
{
    .article-sale-price {
        font-size: 18px; font-size: 1.8rem;
        line-height: 20px; line-height: 2.0rem;
        padding: 6px;
    }
    .article-sale-price span:nth-child(1),
    .article-sale-price span:nth-child(2) span {
        font-size: 12px; font-size: 1.2rem;
    }

    .article-name {
        font-size: 18px; font-size: 1.8rem;
        line-height: 24px; line-height: 2.4rem;
    }
    .article-description {
        font-size: 14px; font-size: 1.4rem;
        line-height: 22px; line-height: 2.2rem;
        margin: -3px 0 0 0;
    }
    .article-sale-description {
        margin-right: -8px;
        margin-left: -8px;
    }
    .article-description span {
        margin: 3px 8px;
    }

    .month {
        top: 12px;
        right: 12px;
        width: 64px;
        height: 64px;
        line-height: 64px;
    }
    .month span:nth-child(1) {
        font-size: 24px; font-size: 2.4rem;
        margin-left: 2px;
    }
    .month span:nth-child(2) {
        font-size: 14px; font-size: 1.4rem;
    }
}