:root {
    /* 简洁的响应式默认样式重置 (reset) */
    --width: 1300px;
    --padding: 0 10px;
    --calc-value: 20px;
    --background-color: #F6F8F9;
    --primary-color: #1778FB;
    --focus-color: var(--primary-color);
    /* 常用响应式断点（移动优先）——一般设置 4–6 个断点：xs/sm/md/lg/xl/xxl */
    --bp-xs: 360px;
    /* 小屏手机 */
    --bp-sm: 480px;
    /* 大屏手机 / 小平板 */
    --bp-md: 768px;
    /* 平板 */
    --bp-lg: 1024px;
    /* 小型笔记本 / 桌面 */
    --bp-xl: 1200px;
    /* 常规大屏桌面 */
    --bp-xxl: 1440px;
    /* 更高清大屏 */
}

/* 基础重置 */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
/* 页面基础 */
html,
body {
    height: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /*font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;*/
    font-size: 16px;
    line-height: 1.4;
    color: #111;
    background: #fff;
    /* font: normal 100% 'Source Sans Pro', sans-serif; */
    /*font-family: Source Sans Pro,Arial, Helvetica, sans-serif;*/
}

/* 媒体元素响应式 */
img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* 列表、链接、表格 */
ul,
ol {
    list-style: none;
}

a {
    color: inherit;
    text-decoration: none;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

/* 只在键盘导航时显示焦点框，鼠标点击时移除 */
a:focus {
    outline: none;
    box-shadow: none;
}

a:focus-visible {
    outline: none;
    outline-offset: 2px;
}

/* 表单与按钮 */
button,
input,
textarea,
select {
    font: inherit;
    color: inherit;
    background: transparent;
    border: 0;
    outline: none;
}

button {
    cursor: pointer;
}

/* 保持可见的键盘焦点样式（无障碍） */
:focus {
    outline: none;
    outline-offset: 2px;
}

/* 自定义 Chrome/Safari 的滚动条样式 */
::-webkit-scrollbar {
    width: 6px; /* 滚动条宽度 */
    height: 6px;
    background-color: transparent; /* 滚动条背景 */
}

::-webkit-scrollbar-thumb {
    background-color: rgba(0,0,0,0.2); /* 滚动条滑块颜色 */
    border-radius: 50px; /* 滚动条滑块圆角 */
}

::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0,0,0,0.5); /* 滚动条滑块悬停时的颜色 */
}

/* 自定义 Firefox 的滚动条样式 */
body {
    scrollbar-width: thin; /* 滚动条宽度 */
    scrollbar-color: #999999 transparent; /* 滚动条滑块颜色和背景颜色 */
}

/* 常用容器工具类，方便响应式布局 */
main{
    padding-bottom: 56px;
    min-height: calc(100vh - 88px - 70px);
}
.container {
    width: var(--width);
    padding: var(--padding);
    box-sizing: content-box;
    margin: 0 auto;
}

.both {
    clear: both;
}

/* 导航栏开始 */
.navigation{
    width: 100%;
    min-width: var(--width);
    height: 88px;
    background-color: #FFFFFF;
}
.nav{
    width: var(--width);
    height: 100%;
    padding: var(--padding);
    box-sizing: content-box;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}
.nav_fixed{
    position: fixed;
    top: 0;
    z-index: 100;
}
.nav_zhanwei {
    width: 100%;
    height: 88px;
    background: #FFFFFF;
    display: none;
}
.nav_logo{
    width: 179px;
}
.nav_logo img{
    width: 100%;
}
.nav_menu{
    display: flex;
    align-items: center;
}
.nav_menu_ul{
    display: flex;
    gap: 52px;
}
.nav_menu_li{
    height: 80px;
    font-size: 20px;
    color: #171717;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    cursor: pointer;
}
.nav_xian{
    width: 1px;
    height: 2px;
    background-color: transparent;
    transition: 0.3s;
    position: absolute;
    bottom: 0;
}
.nav_menu_state .nav_xian{
    width: 50px;
    background-color: var(--primary-color);
}
.nav_menu_li:hover{
    color: var(--primary-color);
}
.nav_menu_li:hover .nav_xian{
    width: 50px;
    background-color: var(--primary-color);
}
.nav_logon{
    display: flex;
    align-items: center;
    margin-left: 52px;
}
.nav_login{
    font-size: 18px;
    color: #171717;
    cursor: pointer;
}
.nav_login:hover{
    color: var(--primary-color);
}
.nav_register{
    width: 73px;
    height: 38px;
    background: var(--primary-color);
    border-radius: 20px;
    font-size: 18px;
    color: #FFFFFF;
    line-height: 38px;
    text-align: center;
    margin-left: 13px;
    cursor: pointer;
    transition: 0.3s;
}
.nav_register:hover{
    letter-spacing: 2px;
}
.nav_user{
    height: 80px;
    display: flex;
    align-items: center;
    margin-left: 52px;
    position: relative;
    cursor: default;
}
.nav_user_icon{
    width: 24px;
    height: 24px;
    border-radius: 50%;
}
.nav_user_name{
    max-width: 171px;
    font-size: 18px;
    color: #171717;
    margin-left: 6px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}
.nav_user_menu{
    width: 129px;
    height: 1px;
    background: #FFFFFF;
    border-radius: 4px;
    padding: 4px 10px;
    position: fixed;
    top: 67px;
    z-index: 10;
    margin-left: -9px;
    overflow: hidden;
    transition: 0.3s;
    opacity: 0;
}
.nav_user:hover .nav_user_menu{
    height: 111px;
    box-shadow: 0 0 10px #e8e8e8;
    opacity: 1;
}
/*.nav_menu_li:hover  .nav_user_menu{*/
/*    height: 111px;*/
/*    box-shadow: 0 0 10px #e8e8e8;*/
/*    opacity: 1;*/
/*}*/
.nav_user_menu ul li{
    width: 100px;
    padding: 16px 0;
    display: flex;
    align-items: center;
    font-size: 16px;
    color: #171717;
    border-bottom: 1px solid #EBEBEB;
    transition: 0.3s;
    white-space: nowrap;
}
.nav_user_menu ul a:nth-last-child(1) li{
    border-bottom: none;
}
.nav_user_menu ul li img{
    width: 22px;
    height: 22px;
    margin-right: 8px;
}
.nav_user_menu ul li:hover{
    color: var(--primary-color);
}

/* 导航栏结束 */
.nav_cate_menu{
    width: 1px;
    height: 1px;
    background: #FFFFFF;
    border-radius: 4px;
    padding: 4px 10px;
    position: absolute;
    top: 77px;
    /*left: -200px;*/
    z-index: 10;
    /*margin-left: 100px;*/
    overflow: hidden;
    transition: 0.3s;
    opacity: 0;
    transform: translateX(-50%);
}
/*.nav_menu_li:hover .nav_cate_menu{*/
/*    height: 111px;*/
/*    box-shadow: 0 0 10px #e8e8e8;*/
/*    opacity: 1;*/
/*}*/
.nav_cate_menu ul {
    display: flex;
}
.nav_cate_menu ul li{
    /*width: 100px;*/
    padding: 10px 16px;
    display: flex;
    align-items: center;
    font-size: 16px;
    color: #171717;
    border-right: 1px solid #EBEBEB;
    transition: 0.3s;
    white-space: nowrap;
}
.nav_cate_menu ul a:nth-last-child(1) li{
    border-right: none;
}
.nav_cate_menu ul li img{
    width: 22px;
    height: 22px;
    margin-right: 8px;
}
.nav_cate_menu ul li:hover{
    color: var(--primary-color);
}
.nav_menu_erji_1 {
    position: relative;
}
.nav_menu_erji_1 .nav_cate_menu{
    transition: 0.5s;
}
.nav_menu_erji_1:hover .nav_cate_menu{
    width: auto;
    height: auto;
    box-shadow: 0 0 10px #e8e8e8;
    opacity: 1;
}
.nav_menu_erji_1 .nav_cate_menu{
    /*width: 100px;*/
}
.nav_menu_erji_1 .nav_cate_menu ul li span{
    width: 100%;
    text-align: center;
}
/* 底部开始 */
.footer{
    width: 100%;
    min-width: calc(var(--width) + var(--calc-value));
    box-sizing: content-box;
    height: 70px;
    background-color: #21569D;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    font-size: 16px;
    color: #A1B6CF;
}
.footer a{
    transition: 0.3s;
    color: inherit;
}
.footer a:hover{
    color: #FFFFFF;
    text-decoration: revert;
}
/* 底部结束 */
/* 右侧开始 */
.rightfloat{
    position: fixed;
    right: 20px;
    top: 56%;
    z-index: 10;
}
.rightfloat_menu{
    width: 71px;
    background: #FFFFFF;
    box-shadow: 0px 1px 10px 0px rgba(174,187,201,0.45);
    border-radius: 10px;
}
.rightfloat_flex{
    width: 80%;
    height: 102px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    cursor: pointer;
}
.rightfloat_flex:nth-child(1){
    border-bottom: 1px solid #F0F0F0;
}
.rightfloat_flex img{
    width: 32px;
    height: 32px;
}
.rightfloat_flex p{
    font-size: 14px;
    color: #767676;
    margin-top: 6px;
    text-align: center;
    transition: 0.3s;
}
.rightfloat_flex:hover p{
    color: var(--primary-color);
}
.rightfloat_top{
    width: 71px;
    height: 70px;
    background: #FFFFFF;
    box-shadow: 0px 1px 10px 0px rgba(174,187,201,0.45);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
}
.rightfloat_top img{
    width: 41px;
    height: 33px;
    transition: 0.3s;
}
.rightfloat_top:hover img{
    transform: scale(1.1);
}
/* 右侧结束 */
/* 页面标题开始 */
.page_title{
    width: 100%;
    min-width: calc(var(--width) + var(--calc-value));
    height: 153px;
    position: relative;
}
.page_title img{
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.page_title_main{
    width: var(--width);
    height: 100%;
    padding: var(--padding);
    box-sizing: content-box;
    display: flex;
    align-items: center;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}
.page_title_main h1{
    font-weight: 800;
    font-size: 44px;
    color: #FFFFFF;
}
.page_title_main span{
    font-size: 30px;
    color: #FFFFFF;
    margin-left: 30px;
}
.page_title_two{
    height: 203px;
}
.page_title_two .page_title_main{
    height: calc(100% - 56px);
    align-items: baseline;
    flex-wrap: wrap;
    padding-top: 56px;
}
.page_title_two h1{
    color: #171717;
}
.page_title_two span{
    color: #171717;
}
/* 页面标题结束 */
/* 页面标题加搜索框开始 */
.research_header{
    width: 100%;
    min-width: calc(var(--width) + var(--calc-value));
    height: 347px;
    position: relative;
}
.research_header_308{
    height: 308px;
}
.research_header_bj{
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
}
.research_header_title{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding-top: 40px;
    position: relative;
}
.research_header_title h1{
    font-weight: 800;
    font-size: 34px;
    color: #FFFFFF;
}
.research_header_title p{
    font-size: 20px;
    color: rgba(255,255,255,0.6);
    margin-top: 6px;
}
.research_header_type{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    column-gap: 60px;
    position: relative;
    margin-top: 45px;
}
.research_header_type_tab{
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    cursor: pointer;
}
.research_header_type_tab .xian{
    width: 1px;
    height: 2px;
    border-radius: 1px;
    background-color: transparent;
    margin-top: 15px;
    transition: 0.3s;
}
.research_header_type_tab_name{
    display: flex;
    align-items: center;
    font-size: 18px;
    color: #FFFFFF;
}
.research_header_type_tab_name img{
    width: 20px;
    margin-right: 5px;
}
.research_header_type_tab_active .xian{
    width: 69px;
    background-color: #FFFFFF;
}
.research_header_type_tab:hover .xian{
    width: 69px;
    background-color: #FFFFFF;
}
.research_header_search{
    width: 885px;
    height: 50px;
    background: #FFFFFF;
    border-radius: 8px;
    position: relative;
    margin: 20px auto 0;
    padding: 0 4px 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.research_header_search_left{
    display: flex;
    align-items: center;
}
.research_header_search_left img{
    width: 19px;
}
.research_header_search_left input{
    width: 700px;
    margin-left: 9px;
    font-size: 14px;
    color: #171717;
}
.research_header_search_btn{
    width: 87px;
    height: 42px;
    background: var(--primary-color);
    border-radius: 8px;
    line-height: 42px;
    text-align: center;
    font-size: 16px;
    color: #FFFFFF;
    cursor: pointer;
}
.research_header_hot{
    width: 885px;
    display: flex;
    margin: 18px auto 0;
    position: relative;
}
.research_header_hot_title{
    display: flex;
    align-items: center;
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    white-space: nowrap;
}
.research_header_hot_title img{
    width: 15px;
    height: 18px;
    margin-right: 8px;
}
.research_header_hot_flex{
    width: calc(100% - 78px - 8px - 10px);
    margin-left: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}
.research_header_hot_flex span{
    font-size: 14px;
    color: #FFFFFF;
    opacity: 0.6;
    transition: 0.3s;
    cursor: pointer;
}
.research_header_hot_flex span:hover{
    opacity: 1;
}
/* 页面标题加搜索框结束 */
/* 分页开始 */
.fenye{
    width: 100%;
    padding: 0 24px;
    margin-top: 25px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.fenye ul{
    display: flex;
    align-items: center;
    column-gap: 20px;
}
.fenye ul li{
    width: 35px;
    height: 35px;
    border: 1px solid #EBECF0;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.3s;
}
.fenye ul li:hover{
    color: #FFFFFF;
    background: var(--primary-color);
    border: 1px solid var(--primary-color);
}
.page_active{
    color: #FFFFFF;
    background: var(--primary-color);
    border: 1px solid var(--primary-color);
}
.fenye ul li img{
    width: 7px;
    height: 13px;
}
.fenye_qianwang{
    display: flex;
    align-items: center;
}
.fenye_qianwang span{
    margin-left: 10px;
    font-size: 16px;
    color: #171717;
}
.fenye_input{
    width: 53px;
    height: 35px;
    background: #F7F8F9;
    border-radius: 6px;
    border: 1px solid #EBECF0;
    margin: 0 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.fenye_input input{
    width: 100%;
    text-align: center;
    font-size: 16px;
    color: #171717;
}
.fenye_jump{
    width: 73px;
    height: 35px;
    background: var(--primary-color);
    border-radius: 6px;
    margin-left: 36px;
    font-size: 16px;
    color: #FFFFFF;
    line-height: 35px;
    text-align: center;
    cursor: pointer;
}
/* 分页结束 */
/* 空页面开始 */
.null{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding-top: 56px;
}
.null img{
    width: 200px;
}
.null p{
    font-size: 16px;
    color: #b1b1b1;
    margin-top: 10px;
}
/* 空页面结束 */
/* 提示框开始 */
.tips_popup{
    width: fit-content;
    padding: 10px 18px;
    border-radius: 6px;
    background-color: rgba(0,0,0,0.5);
    font-size: 15px;
    color: #ffffff;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
/* 提示框结束 */

.flex{
    display: flex;
}

/* 非会员弹窗开始 */
.vipPopup{
    width: 100%;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10;
    display: none;
    align-items: center;
    justify-content: center;
}
.vipPopup_bj{
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}
.vipPopup_main{
    width: 300px;
    padding: 18px 10px 18px;
    border-radius: 10px;
    background-color: #FFFFFF;
    position: absolute;
}
.vipPopup_main_title{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    font-size: 16px;
    color: #171717;
    font-weight: bold;
    line-height: 16px;
}
.vipPopup_main_title img{
    width: 13px;
    height: 13px;
    position: absolute;
    right: 10px;
    cursor: pointer;
    transition: 0.3s;
}
.vipPopup_main_title img:hover{
    transform: rotate(180deg);
}
.vipPopup_main_tips{
    width: 100%;
    font-size: 15px;
    color: #171717;
    padding: 20px 0 20px;
    text-align: center;
}
.vipPopup_main_flex{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    column-gap: 20px;
}
.vipPopup_btn{
    width: 100px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    border-radius: 4px;
    background-color: #FFFFFF;
    border: 1px solid #4B98FF;
    color: #4B98FF;
    font-size: 13px;
    cursor: pointer;
    transition: 0.3s;
}
.vipPopup_btn2{
    background-color: #4B98FF;
    color: #FFFFFF;
}
.vipPopup_btn:hover{
    letter-spacing: 2px;
}
/* 非会员弹窗结束 */