.page-container {
    width: 100%;
}

.page-container .content-wrap {
    display: flex;
    flex-direction: column;
    max-width: 136rem;
    margin: 0 auto;
    gap: 30px;
    padding: 40px 0;
}

.page-container .content-wrap .sidebar {
    display: flex;
    align-items: center;
    position: relative;
    height: 13rem;
    z-index: 99;
    margin-top: -4rem;
}

.page-container .sidebar .sidebar-header {
    width: 29.7rem;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    padding: 3rem 2rem;
    position: relative;
    margin-top: -52px;

    
    background: url(../images/Slice8.png) no-repeat center;
    background-color: #043584;
    background-size: auto 100%;
    background-position-x: left;
}

.page-container .sidebar .sidebar-header::after {
    content: '';
    position: absolute;
    top: 0;
    right: -3.7rem;
    width: 0;
    height: 0;
    border-top: 2rem solid transparent;
    border-bottom: 0 solid transparent;
    border-right: 2rem solid transparent;
    border-left: 1.7rem solid #003690;
    z-index: -1;
}

.page-container .sidebar .sidebar-header h2 {
    font-size: 3.6rem;
    text-align: center;
}

.page-container .sidebar .sidebar-nav {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    height: 100%;
    padding: 2rem 0;
    margin-left: 7rem;
}

.page-container .sidebar .sidebar-nav .sidebar-decoration {
    border: 0.1rem dotted transparent;
    margin: -2rem 4rem 0 4rem;
    height: 11rem;
    background: #D9D9D9;
    display: none;
}

.page-container .sidebar .nav-item {
    display: block;
    padding: 1.5rem 2rem;
    font-size: 2rem;
    color: #000000;
    margin-right: 9rem;
    position: relative;
}

.page-container .sidebar .nav-item::after {
    content: "";
    display: block;
    border: 0.1rem dotted transparent;
    margin: -2rem 4rem 0 4rem;
    height: 11rem;
    background: #D9D9D9;
    position: absolute;
    left: calc( 100% + 10px );
    top: 0;
}

.page-container .sidebar .nav-item.active {
    color: var(--bjtu-blue);
    border-bottom: 0.4rem solid #b01f24;
}
.page-container .sidebar .nav-item:hover {
    color: var(--bjtu-blue);
    border-bottom: 0.4rem solid #b01f24;
}

.page-container .sidebar .sidebar-decoration-img {
    height: 100%;
    padding-bottom: 2rem;
}

.page-container .sidebar .sidebar-decoration-img img {
    width: 90%;
    height: 90%;
    object-fit: cover;
    filter: brightness(0.9) opacity(0.3);
    margin-top: 5%;
}

.page-container .content-wrap .main-content {
    flex-grow: 1;
    margin-top: 2rem;
}

.page-container .content-wrap .main-content .breadcrumb {
    display: flex;
    justify-content: space-between;
    margin-bottom: 3rem;
    padding-bottom: 0.5rem;
    border-bottom: 0.1rem solid #D4D4D4;
}

.page-container .content-wrap .main-content .breadcrumb .breadcrumb-train {
    display: inline-block;
    width: 2rem;
}

.page-container .content-wrap .main-content .breadcrumb .breadcrumb-icon {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    margin-right: 0.5rem;
    vertical-align: middle;
}

.page-container .content-wrap .main-content .breadcrumb a {
    color: #666;
}

/* 新闻网格布局 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6.5rem;
}

.news-card {
    background: rgba(178, 179, 182, 0);
    cursor: pointer;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.news-thumb {
    width: 40.8rem;
    height: 24.7rem;
    position: relative;
    overflow: hidden;
}

.news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}
.news-thumb:hover img{
    transform: scale( 1.1,1.1);
}

.news-date {
    position: absolute;
    left: 0;
    bottom: 1rem;
    background: #BF1515;
    font-family: Microsoft YaHei, Microsoft YaHei;
    font-weight: 400;
    font-size: 1.4rem;
    color: #FFFFFF;
    padding: 0.4rem 1.2rem;
}

.news-date-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1rem;
    background: #BF1515;
}

.news-info {
    width: 40.8rem;
    height: 12.5rem;
    position: relative;
    padding: 1.5rem 0;
}

.news-title {
    font-family: Microsoft YaHei, Microsoft YaHei;
    font-weight: 400;
    font-size: 16px;
    color: #000000;
    margin: 1.5rem 0 4rem 0;
    padding: 0 1.5rem;
    /* 1. 强制文本单行显示（核心） */
    white-space: nowrap;
    /* 2. 隐藏溢出的文本 */
    overflow: hidden;
    /* 3. 溢出部分显示省略号 */
    text-overflow: ellipsis;
}

.news-info:hover {
    background: rgba(0, 54, 144, 0.1);
    /* background-color: var(--bjtu-silver); */
}

.news-info:hover .news-title>a {
    color: var(--bjtu-red);
}

.news-info-line {
    width: 100%;
    height: 1px;
    background: #D4D4D4;
}

.news-arrow-icon {
    position: absolute;
    bottom: 3.7rem;
    left: 0;
    width: 25px;
    z-index: 3;
    transition: left 0.6s linear;
    pointer-events: none;
    opacity: 0;
}

.news-arrow-icon img {
    width: 100%;
    height: auto;
    display: block;
}

.news-info:hover .news-info-line {
    background: #910303;
}

.news-info:hover .news-arrow-icon {
    left: calc(100% - 25px);
    opacity: 1;
}

.news-info:hover .news-arrow-icon img {
    filter: brightness(0.5) sepia(1) hue-rotate(-50deg) saturate(5);
}



/* 媒体聚交 */
.waterfall {
    width: 100%;
    column-gap: 33px;
    column-count: 3;
    margin: 0 auto;
    overflow: visible;
    font-size: 100px;
}
.waterfall .waterfall_item {
    /* padding: 10px; */
    margin-bottom: 33px;
    break-inside: avoid;
    box-shadow: 1px 1px 12px rgba(0, 0, 0, 0.12);
    padding-bottom: 12px;
    position: relative;
}
.waterfall .waterfall_item:hover{
    top: -3px;
    box-shadow: 1px 1px 12px rgb(0 0 0 / 50%);
}
.waterfall .waterfall_item .waterfall_pic{
    position: relative;
    padding-top: 100%;
}
.waterfall .waterfall_item:nth-child(3) .waterfall_pic,
.waterfall .waterfall_item:nth-child(4) .waterfall_pic,
.waterfall .waterfall_item:nth-child(9) .waterfall_pic{
    padding-top: 50%;
}
.waterfall .waterfall_item .waterfall_pic::after{
    position: absolute;
    content: "";
    left: 0;
    bottom: 0;
    width: 100%;
    height: 80%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0));
    z-index: 1;
}
.waterfall .waterfall_item .waterfall_pic img{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}
.waterfall .waterfall_item .waterfall_pic .waterfall_tag{
    position: absolute;
    bottom: 0;
    left: 40px;
    z-index: 2;
    display: inline-block;
    border-bottom: 4px solid #ee9640;
    font-size: 16px;
    color: white;
    line-height: 32px;
    padding-bottom: 16px;
}
.waterfall .waterfall_item .waterfall_pic .waterfall_tag img{
    width: 32px;
    height: 32px;
    filter: brightness(0) invert(1);
    margin-right: 8px;
}
.waterfall .waterfall_item .waterfall_pic .waterfall_tag .waterfall_iconname{
    margin-left: 40px;
}
.waterfall .waterfall_item .waterfall_pic .waterfall_weixin::after{
    background: url(../images/weixin.png) no-repeat left center;
    background-size:  100%;
}
.waterfall .waterfall_text{
    padding: 25px 40px 40px 40px;
}
.waterfall .waterfall_text p{
    font-size: 12px;
    color: #8d8d8d;
    text-align: left;
    line-height: 32px;
}
.waterfall .waterfall_text span{
    display: block;
    line-height: 26px;
    color: #000000;
    font-size: 16px;
}