#blog-content {
    padding-top: 60px;
}
#blog-content .ttl {
    margin: 0 auto 50px;
    text-align: center;
    font-weight: bold;
}
#blog-content .ttl h2 {
    font-size: 40px;
    letter-spacing: 4px;
}
#blog-content .ttl p {
    font-size: 18px;
    line-height: 1.7;
}
#blog-content .block,
#single-blog-content .block {
    width: 75%;
    max-width: 960px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    margin: auto;
}
#blog-content .block .archives,
#single-blog-content .block article {
    width: 62.5%;
    display: flex;
    flex-wrap: wrap;
    margin-right: 4%;
}
#blog-content .block .archives article {
    width: 31%;
    margin-right: 3.5%;
    margin-bottom: 60px;
}
#blog-content .block .archives article:nth-child(3n) {
    margin-right: 0;
}
#blog-content .block .archives article .thumb img {
    width: 100%;
    aspect-ratio: 37 / 28;
    object-fit: cover;
    margin-bottom: 15px;
}
#blog-content .block .archives article .date {
    font-weight: bold;
    margin-bottom: 13px;
}
#blog-content .block .archives article h3 {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-box-orient: vertical; 
    -webkit-line-clamp: 2;
    overflow: hidden; 
}
#blog-content .block .archives article .author {
    display: flex;
    align-items: center;
}
#blog-content .block .archives article .author img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 50%;
    margin-right: 20px;
}
#blog-content .block .archives article .author li {
    font-size: 14px;
}
.filter_block {
    background-color: #FEF2E2;
    padding: 25px 20px;
    width: 33.5%;
}
.filter_block .item {
    margin-bottom: 40px;
}
.filter_block .filter_ttl {
    width: 100%;
    font-size: 18px;
    font-weight: bold;
    border-bottom: solid #000000 1px;
    padding-bottom: 5px;
    margin-bottom: 20px;
}
.filter_block .author-filter-list {
    display: flex;
    flex-wrap: wrap;
}
.filter_block .author-item {
    width: 50%;
    display: flex;
    font-size: 14px;
    margin-bottom: 18px;
}
.filter_block .author-item img {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    margin-right: 10px;
}
.filter_block .archive-year {
    margin-bottom: 11px;
}
.filter_block .archive-year .flex {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}
.filter_block .archive-year .flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.filter_block .archive-year img {
    width: 12px;
    margin-right: 6px;
    transition: transform 0.3s ease;
}
.filter_block .archive-year .btn {
    cursor: pointer;
}
/* 展開時に回転 */
.filter_block .archive-year.open .year {
  transform: rotate(90deg);
}
.filter_block .archive-year .archive-month-list {
    display: none;
}
.filter_block .archive-year .archive-month {
    margin-left: 20px;
}
.filter_block .archive-year .archive-month .archive-day-list {
    margin-left: 20px;
}
@media screen and (max-width: 768px) {
    #blog-content {
        padding-top: 50px;
    }
    #blog-content .ttl h2 {
        font-size: 25px;
    }
    #blog-content .ttl p {
        font-size: 12px;
        line-height: 1.2;
    }
    #blog-content .block,
    #single-blog-content .block {
        width: calc(100% - 40px);
        flex-direction: column;
    }
    #blog-content .block .archives,
    #single-blog-content .block article {
        width: 100%;
        margin-right: 0;
    }
    #blog-content .block .archives {
        margin-bottom: 50px;
    }
    #blog-content .block .archives article {
        width: 49%;
        margin-right: 2%;
        margin-bottom: 25px;
    }
    #blog-content .block .archives article:nth-child(3n) {
        margin-right: 2%;
    }
    #blog-content .block .archives article:nth-child(2n) {
        margin-right: 0;
    }
    #blog-content .block .archives article .date {
        font-weight: bold;
        font-size: 13px;
        margin-bottom: 10px;
    }
    #blog-content .block .archives article h3 {
        font-size: 14px;
        margin-bottom: 17px;
    }
    #blog-content .block .archives article .author img {
        width: 50px;
        height: 50px;
        margin-right: 15px;
    }
    #blog-content .block .archives article .author li {
        font-size: 11px;
    }
    .filter_block {
        background-color: #FEF2E2;
        padding: 25px 20px;
        width: 100%;
    }
    .filter_block .item {
        margin-bottom: 40px;
    }
    .filter_block .archive-year {
        margin-bottom: 11px;
    }
}

#single-blog-content {
    padding: 30px 0 30px 0;
}
#single-blog-content .logo {
    width: 118px;
    margin-left: 40px;
    margin-bottom: 50px;
}
#single-blog-content .ttl {
    margin: 0 auto 55px;
    text-align: center;
    font-weight: bold;
}
#single-blog-content .ttl h2 {
    font-size: 40px;
    letter-spacing: 4px;
}
#single-blog-content .ttl p {
    font-size: 18px;
    line-height: 1.7;
}
#single-blog-content .block article .date {
    font-size: 16px;
    margin-bottom: 10px;
}
#single-blog-content .block article h3 {
    font-size: 30px;
    margin-bottom: 28px;
}
#single-blog-content .block article .author {
    display: flex;
    align-items: center;
    margin-bottom: 40px;
}
#single-blog-content .block article .author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 20px;
}
#single-blog-content .block article .author ul li {
    font-size: 14px;
}
#single-blog-content .block article .content .item {
    margin-bottom: 53px;
}
#single-blog-content .block article .content .item h4 {
    font-size: 18px;
    margin-bottom: 10px;
}
#single-blog-content .block article .content .item img {
    width: 100%;
    margin-bottom: 30px;
}
#single-blog-content .block article .content .item .discription {
    line-height: 2;
}
@media screen and (max-width: 768px) {
    #single-blog-content {
        padding: 45px 0 0 0;
    }
    #single-blog-content .logo {
        display: none;
    }
    #single-blog-content .ttl {
        margin: 0 auto 40px;
    }
    #single-blog-content .ttl h2 {
        font-size: 25px;
    }
    #single-blog-content .ttl p {
        font-size: 12px;
        line-height: 1.2;
    }
    #single-blog-content .block article .date {
        font-size: 11px;
    }
    #single-blog-content .block article h3 {
        font-size: 17px;
        margin-bottom: 20px;
    }
    #single-blog-content .block article .author {
        margin-bottom: 25px;
    }
    #single-blog-content .block article .content .item {
        margin-bottom: 53px;
    }
    #single-blog-content .block article .content .item h4 {
        font-size: 17px;
        margin-bottom: 10px;
    }
    #single-blog-content .block article .content .item img {
        width: 100%;
        margin-bottom: 30px;
    }
    #single-blog-content .block article .content .item .discription {
        line-height: 2;
    }
}