.yanjiu_box {
    width: 100%;
    padding-top: calc(20px + 4rem);
}

.yanjiu {
    max-width: 1480px;
    width: 90%;
    margin: auto;
    display: flex;
    justify-content: space-between;
    gap: calc(12px + 3rem);
}

/* 左侧边栏 */
.sidebar {
    width: 17.5676%;
    flex-shrink: 0;
}

.search-box {
    display: flex;
    margin-bottom: 20px;
}

.search-box input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #e0e0e0;
    border-right: none;
    border-radius: 4px 0 0 4px;
    font-size: 14px;
}

.search-btn {
    width: 50px;
    border: 1px solid #c9ad6a;
    background-color: #fff;
    border-radius: 0 4px 4px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.search-btn img{
    width: calc(3px + 1rem);
}


.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 10px;
}

.sidebar-menu li a {
    display: block;
    padding: 12px 15px;
    background-color: #f0f0f0;
    color: #333333;
    text-decoration: none;
    text-align: center;
    border-radius: 4px;
    font-size: 15px;
    transition: all 0.3s;
}

.sidebar-menu li a.active {
    background-color: #c9ad6a;
    color: #fff;
}

/* 右侧文章列表 */
.article-list {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.article-card {
    background-color: #f9f9f9;
    border-radius: 8px;
    padding: calc(4px + 2rem) calc(10px + 1rem);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 220px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.article-card.active {
    background-color: #c9ad6a;
    color: #fff;
}

.article-title {
    font-family: PingFang SC;
    font-weight: 500;
    font-size: calc(8px + 0.5rem);
    color: #BFA151;
    line-height: calc(4px + 1.5rem);
    margin-bottom: calc(7px + 1rem);
}

.article-card:not(.active) .article-title {
    color: #c9ad6a;
}

.article-author {
font-family: PingFang SC;
font-weight: 500;
font-size: calc(6px + 0.5rem);
color: #9B9B9B;
line-height: calc(6px + 1.5rem);
margin-bottom: calc(17px + 4rem);
}

.article-card:not(.active) .article-author {
    color: #999;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}

.article-meta span{
font-family: Microsoft YaHei;
font-weight: 400;
font-size: calc(4px + 0.5rem);
color: #ACADB1;
line-height: calc(2px + 1.5rem);
}
.article-card:not(.active) .article-meta {
    color: #999;
}

.article-card:hover{
    background-color: #BFA151;
}
.article-card:hover .article-title{
    color: #ffffff;
}
.article-card:hover .article-author{
    color: #ffffff;
}
.article-card:hover .article-meta span{
    color: #ffffff;
}