/* ==============================
  base
============================== */
#main_wrapper #sidebar {
    display: none;
}
#content {
    width: 800px;
    margin: 0 auto;
}
#content {
    margin-top: 150px;
}
.post-date {
    display: none;
}
.entry-title {
    display: none;
}
#content {
    text-align: justify;
    line-height: 1.8;
}
#content h2 {
    font-size: 3.5rem;
    font-weight: bold;
    padding: 0 0 20px 0;
}
#content h3 {
    font-size: 3rem;
    font-weight: bold;
    border-bottom: solid 3px #666;
    margin: 10px 0 10px 0;
    padding-left: 10px;
}
#content h4 {
    font-size: 2.5rem;
    font-weight: bold;
    border-left: solid 3px #666;
    margin: 10px 0 10px 0;
    padding-left: 10px;
}
@media screen and (max-width: 768px) {
    #content {
        font-size: 1.6rem;
        margin-top: 100px;
        width: 92%;
    }
    #content h2 {
        font-size: 2rem;
        font-weight: bold;
        padding: 0 0 20px 0;
        width: 92%;
        margin: 0 auto;
    }
    #content h3 {
        font-size: 1.7rem;
        font-weight: bold;
    }
    #content h4 {
        font-size: 1.4rem;
        font-weight: bold;
    }
    #content p {
        font-size: 1.6rem;
        margin: 0 auto;
    }
}
.navigation {
    font-family: "ヒラギノ明朝 ProN W3", "Hiragino Mincho ProN", "游明朝",
        YuMincho, "HG明朝E", "ＭＳ Ｐ明朝", "ＭＳ 明朝", serif;
    text-align: center;
    margin: 40px 0 10px 0;
}
.navigation a {
    color: #666666;
}
.edit-link {
    display: none;
}
#content .back-to-archive {
    text-align: center;
    font-size: 2rem;
    padding: 10px;
    margin: 60px 0 30px 0;
    border: solid 1px#666666;
}
#content .back-to-archive a {
    color: #666666;
    display: block;
}

/* ==============================
  group
============================== */

#group {
    max-width: 1000px;
    margin: 100px auto 60px auto;
}
.page_title {
    font-size: 2.4rem;
    font-weight: bold;
    text-align: center;
}
.page_title_eng {
    font-size: 1.5rem;
    margin-bottom: 40px;
}
.page_description {
    font-size: 1.6rem;
    text-align: justify;
    margin: 0 auto;
    width: 80%;
    letter-spacing: 1.1px;
    line-height: 1.6;
    margin-bottom: 40px;
}

.group-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    padding: 8px 0;
}

.group-item {
    margin-bottom: 0;
    border: 1px solid #e8e8e3;
    background: #fff;
    /* border-radius: 10px; */
    box-sizing: border-box;
    overflow: hidden;
    /* transition: transform 0.2s ease, box-shadow 0.2s ease,
        border-color 0.2s ease; */
}

.group-item-banner {
    display: block;
    background: #fff;
}

.group-item-banner a {
    display: block;
}

.group-item-banner img {
    width: 100%;
    height: auto;
    display: block;
}

.group-item-name {
    font-size: 1.8rem;
    font-weight: bold;
    text-align: left;
    padding: 14px 16px;
    margin: 0;
    border-top: 1px solid #f0f0ed;
}

/* .group-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
    border-color: #deded9;
} */

@media screen and (max-width: 768px) {
    #group {
        max-width: 1000px;
        margin: 50px auto 60px auto;
    }
    .page_title {
        font-size: 2rem;
    }

    .group-list {
        margin: 0 auto;
        grid-template-columns: 1fr;
        width: 92%;
        gap: 14px;
        padding: 6px 0;
    }

    .group-item {
        margin-bottom: 0;
    }

    .group-item-banner {
        /* 高さの固定を外し、横幅優先で表示 */
        height: auto;
        padding: 0;
    }

    .group-item-banner img {
        display: block;
        width: 100%;
        height: auto;
        margin: 0 auto;
    }

    .group-item-name {
        font-size: 1.6rem;
        padding: 10px 14px;
        text-align: left;
    }
}