* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

.w {
    width: 1200px;
    margin: auto;
}

body {
    background-color: #f3f5f7;
}

li {
    list-style: none;

}

a {
    text-decoration: none;
}

.clearfix:before,
.clearfix:after {
    content: "";
    display: table;

}

.clearfix:after {
    clear: both;
}

.clearfix {
    *zoom: 1;
}


.header {
    height: 42px;
    margin: 30px auto;
}


.logo {
    float: left;
    width: 198px;
    height: 42px;
}


.nav {
    float: left;
    margin-left: 160px;
}

.nav ul li {
    float: left;
    margin: 0 10px;

}

.nav ul li a {
    display: block;
    height: 42px;
    padding: 0 10px;
    line-height: 42px;
    font-size: 18px;
    color: #050505;
}

.nav ul li a:hover {
    border-bottom: 2px solid #00a4ff;
    color: #00a4ff;
}

/* search搜索模块 */
.search {
    float: left;
    width: 412px;
    height: 42px;
    margin-left: 70px;
}

.search input {
    float: left;
    width: 345px;
    height: 40px;
    border: 1px solid #00a4ff;
    border-right: 0;
    color: #bfbfbf;
    font-size: 14px;
    padding-left: 15px;
}

.search button {
    float: left;
    width: 50px;
    height: 42px;
    /* 按钮button默认有个边框需要我们手动去掉 */
    border: 0;
    background: url(images/btn.png);
}

.user {
    float: right;
    line-height: 42px;
    margin-right: 30px;
    font-size: 14px;
    color: #666;

}

.user,
img {
    vertical-align: middle;
}

/* introduce区域 */
.introduce {
    overflow: auto;
    height: auto;
    background-color: white;
}

.l {
    text-align: center;
    float: left;
    padding-top: 35px;
    width: 280px;
}

.l h2 {
    padding-top: 10px;
    padding-bottom: 10px;
    background-color: #00a4ff;
    color: white;
}

.chuandai {
    font-size: 16px;
    height: 50px;
    width: 890px;
    line-height: 50px;
    padding-left: 5px;
    margin-bottom: 10px;
    background-color: #eeeeee;
}

.l ul li {
    padding: 20px 20px;
    border: 1px solid #ccccccbb;
    margin: 0 0 -1px -1px;
}

.l ul li button:hover {
    color: #00a4ff;
}

.l ul li a:hover {
    color: #00a4ff;
}

.l ul li a {
    font-size: 14px;
    color: black;
}

.l ul li ul li {
    border: 0px;
}

.l ul li a button {
    width: 250px;
}

.l ul li a button span {
    float: right;
}


.main_nav ul li {
    border: 0px;
}

.r {
    float: right;
    width: 900px;
    height: auto;
    margin-top: 35px;
    margin-left: 10px;
    background-color: white;
}

.r iframe {
    /* top: 0;
    left: 0; */
    width: 910px;
    height: 630px;
    border: none;
    margin-left: 15px;
    background-color: white;

}

.left {
    display: flex;
}

/* .sidebar {
            width: 200px;
            background-color: lightgray;
        } */

.r {
    flex: 1;
}

.hide {
    border: 0;
    font-size: 14px;
    background-color: white;
}


.show {
    border: 0;
    font-size: 14px;
    background-color: white;
}

.main_nav {
    cursor: pointer;
}

.background .w {
    height: 200px;
    background: url(images/bg.webp) no-repeat top center;
    background-size: 100% 100%;
}

/* banner区域 */
.banner {
    height: 421px;
    background-color: hsl(200, 19%, 88%);
}

.banner .w {
    height: 421px;
    background: url(images/building.jpg) no-repeat top center;
}



.details {
    font-size: 16px;
    overflow: auto;
    margin-bottom: 10px;
}

.details .w {
    background-color: white;
}

.details h2,
.intro {
    margin-left: 15px;
    margin-right: 15px;
}

.details p {
    color: #555;
    text-indent: 2em;
    line-height: 30px;
}

.details ul li {
    color: #555;
    line-height: 30px;
}

.subnav {
    float: left;
    width: 190px;
    height: 421px;
    background: rgba(0, 0, 0, 0.3);
}

.title {
    margin-top: 20px;
    font-size: 30px;
}

/* .title h2 {
    background-color: #9bceea;
    color: black;
} */

.imgde {
    float: right;
}

.imgde img {
    height: 350px;
    width: 400px;
}

.intro {
    margin-top: 20px;
    height: auto;
}

.subnav ul li {
    height: 45px;
    line-height: 210px;
    padding: 0 20px;
}

.subnav ul li {
    font-size: 14px;
    color: #fff;
}

/* .subnav ul li a:hover {
    color: #00a4ff;
} */

/* .subnav ul li a span {
    height: 5px;
    float: right;
} */

.course {
    float: right;
    width: 230px;
    height: 300px;
    background-color: #fff;
    /* 浮动的盒子不会有外边距合并的问题 */
    margin-top: 50px;
}

.course h2 {
    height: 48px;
    background-color: #9bceea;
    text-align: center;
    line-height: 48px;
    font-size: 18px;
    color: #fff;

}


.bd {
    text-align: center;
    padding: 0 20px;
}

.bd ul li {
    padding: 13px 0;
    border-bottom: 1px solid #ccc;
}

.bd ul li h4 {
    font-size: 16px;
    color: #4e4e4e;
}

.bd ul li p {
    font-size: 16px;
    color: #a5a5a5;
}

.bd .more {
    display: block;
    height: 38px;
    border: 1px solid #00a4ff;
    margin-top: 5px;
    text-align: center;
    line-height: 38px;
    color: #00a4ff;
    font-size: 16px;
    font-weight: 700;
}

/* 精品推荐模块 */
.goods {

    height: 300px;
    background-color: #fff;
    margin-top: 10px;
    box-shadow: 0 2px 3px 3px rgba(0, 0, 0, 0.1);
    /* 行高汇集成给三个孩子 */
    line-height: 60px;
}

.goods p {
    color: #555;
    margin-left: 15px;
    text-indent: 2em;
    line-height: 30px;
}

.goods h3 {

    margin-left: 30px;
    font-size: 16px;
    color: #00a4ff;

}

.goods ul {
    float: left;
    margin-left: 30px;
}

.goods ul li {
    float: left;
}

.goods ul li a {
    padding: 0 30px;
    font-size: 14px;
    color: #050505;
    border-left: 1px solid #ccc;
}

.mod {
    float: right;
    margin-right: 30px;
    font-size: 14px;
    color: #00a4ff;
}

.box {
    margin-top: 30px;
}

.box-hd {
    height: 45px;
}



.box-hd h3 {
    float: left;
    font-size: 20px;
    color: #00a4ff;
}

.box-hd a {
    float: right;
    font-size: 12px;
    color: #a5a5a5;
    margin-top: 10px;
    margin-right: 30px;
}

.box-bd ul {
    width: 1225px;
}


.box-bd ul li {
    position: relative;
    float: left;
    width: 228px;
    height: 270px;
    background-color: #fff;
    margin-right: 15px;
    margin-bottom: 15px;
}

.box-bd ul li a {
    color: #a5a5a5;

}

.box-bd ul li a:hover {
    color: #00a4ff;
}

.box-bd ul li a h4:hover {
    color: #00a4ff;
}

.box-bd ul li>img {
    width: 100%;
    height: 144.64px;
}



.box-bd ul li em {
    position: absolute;
    top: 4px;
    right: -4px;
}

.box-bd ul li h4 {
    margin: 20px 20px 20px 25px;
    font-size: 14px;
    color: #050505;
    font-weight: 400;
}

.box-bd .info {
    margin: 0 20px 0 25px;
    font-size: 12px;
    color: #999;
}

.box-bd .info span {
    color: #ff7c2d;
}



.click a {
    font-size: 16px;
    color: black;
    margin-right: 0px;
}

.numa {
    width: 910px;
    height: 620px;
    margin-bottom: 10px;
    clear: both;
    background-color: white;
}

.numb {
    width: 910px;
    height: auto;
    margin-bottom: 10px;
    clear: both;
}

.box-p {
    height: 45px;
}

.box-p h3 {
    float: left;
    font-size: 20px;
    color: #494949;
}

/* .box-p a {
    float: right;
    font-size: 12px;
    color: #a5a5a5;
    margin-right: 10px;
} */

.box-p ul {
    width: 910px;
}

.box-p ul li {
    position: relative;
    float: left;
    width: 212.5px;
    height: 270px;
    background-color: #fff;
    margin-right: 15px;
    margin-bottom: 15px;
}

.box-p ul li a {
    color: #a5a5a5;

}

.box-p ul li>img {
    width: 100%;
    height: 144.64px;
}

.box-p ul li em {
    position: absolute;
    top: 4px;
    right: -4px;
}

.box-p ul li h4 {
    margin: 20px 20px 20px 25px;
    font-size: 14px;
    color: #050505;
    font-weight: 400;
}

.box-p ul li a h4:hover {
    color: #00a4ff;
}

.box-p .info {
    margin: 0 20px 0 25px;
    font-size: 12px;
    color: #999;
}

.box-p .info span {
    float: left;
    color: #ff7c2d;
}

.info a:hover {
    color: #00a4ff;
}

.footerintro .w {
    text-align: center;
    background-color: rgb(213, 223, 228);
}

.footerintro p {
    height: 35px;
    line-height: 35px;
}

/* footer 模块 */
.footer {
    text-align: center;
    background-color: white;
    overflow: auto;
}

.footer .w {
    padding-top: 35px;

}

.copyright {
    float: left;
}

.copyright p {
    font-size: 12px;
    color: #666;
    margin: 20px 0 15px 0;
}



.copyright .app {
    display: block;
    width: 118px;
    height: 33px;
    border: 1px solid #00a4ff;
    text-align: center;
    line-height: 33px;
    color: #00a4ff;
    font-size: 16px;
}

.links {
    float: right;

}

.links dl {
    float: left;
    margin-left: 100px;
}

.links dl dt {
    font-size: 16px;
    color: #333;
    margin-bottom: 5px;
}

.links dl dd a {
    font-size: 12px;
    color: #333;
}