.introduction {
    background-color: rgb(30, 94, 165);
    color: #fff;
    font-size: 18px;
    text-indent: 2em;
    font-family: 微软雅黑;
    line-height: 36px;
    letter-spacing: .5px;
    margin: 0 auto;
    padding: 12px 0 10px;
}

.nav {
    height: 45px;
    background-color: #1e5ea5;
    margin-top: 1px;
}

.nav>ul>li {
    float: left;
    font-size: 18px;
    padding: 0 20px;
    position: relative;
    height: 45px;
}

.nav>ul>li:hover {
    background-color: #1672d5;
}

.nav>ul>li>a,
.nav>ul>li>span {
    display: block;
    line-height: 45px;
}

.nav>ul>li:hover>a,
.nav>ul>li:hover>span {
    font-weight: bold;
    font-size: 19px;
}

.nav li {
    cursor: pointer;
}

.nav li,
.nav li a {
    color: #fff;
}


/* .nav li:hover .subnav {
    height: 300px;
} */

.subnav {
    position: absolute;
    top: 50px;
    width: 170px;
    left: 50%;
    transform: translateX(-50%);
    /* height: 0;
    overflow: hidden; transition: 0.5s;*/
    z-index: 100;
    display: none;
}

.subnav ul {
    padding: 10px 0;
    font-size: 14px;
    border-radius: 5px;
    background-color: #1e5ea5;
    opacity: 0.9;
    position: relative;
}


/* 
.subnav ul:after {
    position: absolute;
    content: "";
    left: 70px;
    top: -7px;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #fff;
}

.subnav ul:before {
    position: absolute;
    content: "";
    left: 70px;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    top: -10px;
    border-bottom: 8px solid rgba(0, 0, 0, .01);
} */

.subnav li {
    line-height: 35px;
    height: 35px;
    text-align: center;
    cursor: pointer;
    font-size: 14px;
    color: #fff;
}

.subnav li:hover {
    background: #1672d5;
    font-weight: bold;
}

.title1 {
    padding: 10px 0 0 72px;
    background: url("../images/icon1.png") no-repeat;
    background-size: 60px 42px;
    border-bottom: 4px solid #255d9a;
    background-position: 0 11px;
    margin-bottom: 20px;
    overflow: hidden;
    height: 42px;
}

.title1 h2 {
    float: left;
    font-size: 28px;
    font-weight: 700;
    color: #205d9e;
    line-height: 42px;
}

.title1 a {
    color: #666;
    font-size: 14px;
    padding-top: 16px;
    float: right;
}

.title1 a:hover {
    color: #409eff;
}

.hotspot {
    clear: both;
    margin-top: 30px;
}

.hotspot_list ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin: 0 -15px;
}

.hotspot_bd {
    padding-left: 18px;
    flex: 1;
}

.hotspot_bd dt {
    font-weight: 700;
    font-size: 20px;
    padding-bottom: 15px;
}

.hotspot_bd dt,
.hotspot_bd dt a {
    color: #255d9a;
}

.hotspot_bd dd,
.hotspot_bd dt {
    line-height: 28px;
    height: 28px;
    display: -webkit-box;
    /* 弹性伸缩盒子模型显示 */
    -webkit-box-orient: vertical;
    /* 设置盒子排列方向为垂直 */
    -webkit-line-clamp: 1;
    /* 限制显示的行数 */
    overflow: hidden;
    /* 隐藏溢出的内容 */
}

.hotspot_bd dd,
.hotspot_bd dd a {
    color: #333;
}

.research_list ul {
    display: flex;
    flex-wrap: wrap;
    /* justify-content: space-between; */
    overflow: hidden;
    margin: 0 -10px;
}

.research_item {
    float: left;
    width: 25%;
    box-sizing: border-box;
    margin-bottom: 20px;
    position: relative;
    padding: 0 10px;
    overflow: hidden;
}

.research_item span {
    display: block;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.research_item img {
    width: 100%;
    height: 100%;
}

.research_item img {
    width: 100%;
    transition: 1s;
}

.research_item:hover img {
    transform: scale(1.1);
}

.research_item a {
    position: absolute;
    z-index: 5;
    left: 0;
    right: 0;
    margin: 0 auto;
    bottom: 20px;
    width: 71.92%;
    color: #fff;
    font-size: 18px;
    text-align: center;
    background-color: rgba(0, 0, 0, .3);
    border: 1px solid #666;
    height: 34px;
    line-height: 34px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    padding: 0 5px;
    box-sizing: border-box;
}

.countrys_bd {
    background: #f5f5f5;
    padding-top: 15px;
    margin-bottom: 15px;
}

.countrys_bd li {
    float: left;
    width: 90px;
    height: 40px;
    color: #333;
    text-align: center;
    font-size: 16px;
    cursor: pointer;
    margin: 0 20px;
}

.countrys_bd li:hover a {
    color: #409eff;
}

.col-3 {
    width: 30.5%;
}

.col-6 {
    width: 65.25%;
}

.col-5 {
    width: 47.9%;
}

.col-bd {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.col-bd .list1 {
    width: 46.95%;
}

.list1 li {
    color: #333;
    cursor: pointer;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    line-height: 42px;
    font-size: 16px;
}

.list1 li,
.list1 a {
    color: #333;
}

.booklist ul {
    display: flex;
    justify-content: space-between;
    margin-right: -10px;
}

.booklist li {
    width: 20%;
    padding-right: 10px;
    box-sizing: border-box;
}

.booklist li img {
    width: 100%;
}

.tabc_more {
    display: block;
    color: #59b1a3;
    padding: 0 45px;
    color: #d18d2a;
    text-align: right;
    line-height: 42px;
    font-weight: bold;
}

.academic-tab {
    width: 100%;
    display: flex;
    height: 50px;
    border: 1px solid #1e5ea5;
}

.academic-tab li {
    flex: 1;
    height: 50px;
    line-height: 50px;
    color: #fff;
    font-size: 18px;
    text-align: center;
    background: #1e5ea5;
    cursor: pointer;
}

.academic-tab li.active {
    background-color: #fff;
    color: #333;
}

.academic-list {
    padding: 20px 15px;
    flex: 1;
    box-sizing: border-box;
}

.academic-list li {
    font-size: 16px;
    line-height: 32px;
    height: 32px;
    color: #333;
    display: -webkit-box;
    /* 弹性伸缩盒子模型显示 */
    -webkit-box-orient: vertical;
    /* 设置盒子排列方向为垂直 */
    -webkit-line-clamp: 1;
    /* 限制显示的行数 */
    overflow: hidden;
    /* 隐藏溢出的内容 */
}

.academic-list li a {
    color: #333;
}

.academic-list li:hover a {
    color: #409eff;
}

.academic-more {
    padding-top: 18px;
    text-align: right;
}

.academic-more a {
    margin-top: 20px;
    line-height: 42px;
    color: rgb(64, 158, 255);
    font-weight: 700;
    text-align: center;
    line-height: 42px;
    font-size: 16px;
    text-align: center;
}

.authorlist {
    display: flex;
    padding: 20px 0;
}

.authorlist li {
    display: flex;
    width: 25%;
    padding-right: 10px;
    cursor: pointer;
    box-sizing: border-box;
}

.authorlist li img {
    width: 120px;
    height: 160px;
    margin-right: 10px;
}

.author_bd dt {
    color: #8c8c8c;
    font-size: 18px;
    font-weight: 700;
    padding-bottom: 15px;
    line-height: 39px;
}

.author_bd dt a {
    color: #8c8c8c;
}

.author_bd dd {
    color: #333;
    line-height: 24px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
}

.menuBtn {
    position: relative;
    z-index: 9;
    display: none;
    float: right;
    width: 26px;
    cursor: pointer;
    height: 24px;
    transition: .3s;
}

.menuBtn b {
    display: block;
    height: 3px;
    width: 100%;
    background-color: #3864a2;
    margin: 5px 0;
    border-radius: 2px;
    transition: .3s;
}

.menuBtn b:last-child {
    margin-bottom: 0
}

.menuBtn.open b {
    opacity: 0;
    position: absolute
}

.menuBtn.open b:first-child {
    left: 0;
    top: 0;
    opacity: 1;
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    transform-origin: 0 0
}

.menuBtn.open b:last-child {
    opacity: 1;
    left: -2px;
    bottom: -2px;
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    transform-origin: 0 0;
    -moz-transform: rotate(-45deg)
}

.mo-top,
.mo-login,
.mo-search {
    display: none;
}

.hotspot_item {
    display: flex;
    width: 50%;
    padding: 0 15px 20px;
    box-sizing: border-box;
}

.hotspot_pic {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 220px;
    height: 160px;
    overflow: hidden;
}

.hotspot_pic img {
    min-width: 100%;
    min-height: 100%;
}

@media screen and (min-width:1199px) {
    .hotspot_pic img {
        width: 220px;
        height: 160px;
    }
}

@media screen and (max-width:1199px) {
    .research_item {
        width: 25%;
        height: auto;
    }
    .research_item img {
        height: auto;
    }
}

@media screen and (max-width:992px) {
    .top {
        height: 55px;
    }
    .nav>ul>li {
        padding: 0 14px;
        font-size: 16px;
    }
    .pc-top {
        display: none;
    }
    .mo-search {
        display: block;
    }
    .nav {
        width: 280px;
        background-color: #3864a2;
        position: fixed;
        left: 0;
        top: 55px;
        bottom: 0;
        z-index: 999;
        transition: .3s;
        -ms-transition: .3s;
        -moz-transition: .3s;
        -webkit-transition: .3s;
        -o-transition: .3s;
        height: calc( 100% - 55px);
        padding: 30px 15px;
        transform: translateX(-320px);
        -ms-transform: translateX(-320px);
        -moz-transform: translateX(-320px);
        -webkit-transform: translateX(-320px);
        -o-transform: translateX(-320px)
    }
    .nav.open {
        transform: translateX(0);
        -ms-transform: translateX(0);
        -moz-transform: translateX(0);
        -webkit-transform: translateX(0);
        -o-transform: translateX(0)
    }
    .nav>ul>li {
        float: none;
        height: auto;
        text-align: left;
        border-bottom: 1px solid #fff;
    }
    .mo-top {
        display: block;
        height: 55px;
        position: fixed;
        left: 0;
        top: 0;
        width: 100%;
        background-color: #fff;
        z-index: 99;
        box-shadow: 0 0 10px rgba(0, 0, 0, .2)
    }
    .mo-top .container {
        height: 55px;
        align-items: center;
    }
    .mo-top .logo {
        color: transparent;
        font-weight: bold;
    }
    .mo-login {
        display: block;
        text-align: center;
        font-size: 14px;
        line-height: 18px;
        margin-bottom: 10px;
        color: #fff
    }
    .mo-login a {
        color: #fff;
        display: inline-block;
        vertical-align: middle;
        padding: 0 4px
    }
    .mo-search {
        margin-bottom: 10px
    }
    .mo-search .select {
        background-color: #fff;
        background-repeat: no-repeat;
        background-position: right 10px center;
        background-image: url(../images/jt1-on.png);
        display: block;
        width: 100%;
        margin-bottom: 15px;
        text-align: center;
        -moz-text-align-last: center;
        text-align-last: center;
        line-height: 32px;
        font-size: 14px
    }
    .mo-search .box {
        display: flex;
        align-items: center;
        justify-content: space-between
    }
    .mo-search .inp {
        flex-grow: 1;
        background-color: #fff;
        padding: 0 15px;
        color: #333;
        line-height: 28px;
        height: 28px;
        font-size: 14px;
        width: 100%;
        border: 1px solid #fff
    }
    .mo-search .sub {
        flex-shrink: 0;
        width: 80px;
        line-height: 28px;
        text-align: center;
        font-size: 14px;
        color: #fff;
        background-color: #00B7EE;
        margin-left: 10px
    }
    .menuBtn {
        display: block
    }
    .top .logo,
    .top .logo img {
        height: 46px;
    }
    .subnav {
        position: static;
        width: 100%;
        transform: none;
    }
    .nav>ul>li:hover .subnav {
        display: block;
    }
}

@media screen and (max-width:992px) {
    .hotspot_item {
        width: 100%;
    }
    .research_list ul {
        flex-wrap: wrap;
    }
    .research_item {
        width: 50%;
    }
    .row5 {
        flex-direction: column;
    }
    .row5 .col-3,
    .row5 .col-6 {
        width: 100%;
        margin-bottom: 10px;
    }
    .authorlist {
        flex-wrap: wrap;
    }
    .authorlist li {
        width: 33.33%;
        margin-bottom: 20px;
    }
    .nav>ul>li {
        font-size: 14px;
    }
    .introduction .container {
        font-size: 14px;
        line-height: 30px;
        overflow: hidden;
        display: -webkit-box;
        -webkit-line-clamp: 4;
        /* 限制为3行 */
        -webkit-box-orient: vertical;
    }
}

@media screen and (max-width:768px) {
    .row4 {
        flex-direction: column;
    }
    .row4 .col-5 {
        width: 100%;
    }
    .authorlist li {
        width: 50%;
        margin-bottom: 10px;
    }
    .row6 .container-flex {
        flex-direction: column;
    }
    .row6 .academic-list {
        width: 100%;
        padding-bottom: 0;
    }
    .introduction .container {
        display: -webkit-box;
        -webkit-line-clamp: 3;
        /* 限制为3行 */
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .footer {
        margin-top: 30px;
    }
}

@media screen and (max-width:576px) {
    .booklist ul {
        flex-wrap: wrap;
        justify-content: flex-start;
    }
    .booklist li {
        width: 33.33%;
        margin-bottom: 10px;
    }
    .top-left span {
        display: block;
    }
    .authorlist li {
        width: 100%;
        margin-top: 10px;
    }
    .row4 .col-bd {
        flex-direction: column;
    }
    .row4 .col-bd .list1 {
        width: 100%;
        padding-bottom: 5px;
    }
    .countrys_bd li {
        margin: 0 5px;
    }
    .title1 h2 {
        font-size: 20px;
    }
    .list1 li {
        line-height: 26px;
        font-size: 14px;
    }
    .academic-tab li {
        font-size: 16px;
    }
    .list1 li,
    .countrys_bd li,
    .academic-list li,
    .research_item a {
        font-size: 14px;
    }
    .academic-more a {
        font-size: 14px;
    }
    .hotspot_item {
        flex-direction: column;
    }
    .hotspot_bd {
        padding: 0;
    }
    .hotspot_bd dt {
        font-size: 16px;
    }
    .hotspot_pic {
        width: 100%;
        margin-bottom: 10px;
    }
}