* {
    margin: 0;
    padding: 0;
    /* 内减模式 */
    box-sizing: border-box;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
}

.clearfix::before,
.clearfix::after {
    content: '';
    display: table;
}

.clearfix::after {
    clear: both;
}

body {
    background-color: #f3f5f7;
}

/* 版心 */
.wrapper {
    width: 1200px;
    margin: 0 auto;
}

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

h1 {
    float: left;
}

/* 导航 */
.nav {
    float: left;
    margin-left: 70px;
    height: 42px;
}

.nav li {
    float: left;
    margin-right: 26px;
}

.nav li a {
    display: block;
    padding: 0 9px;
    height: 42px;
    line-height: 42px;
    /* border-bottom: 2px solid #00a4ff; */

    font-size: 18px;
    color: #505050;
}

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

/* 搜索 */
.search {
    float: left;
    margin-left: 59px;
    width: 412px;
    height: 42px;
    border: 1px solid #00a4ff;
}

.search input {
    float: left;
    padding-left: 20px;
    width: 360px;
    height: 40px;
    border: 0;
}

.search input::placeholder {
    font-size: 14px;
    color: #bfbfbf;
}

.search button {
    float: left;
    width: 50px;
    height: 40px;
    background-color: #00a4ff;
    border: 0;
}

/* 用户 */
.user {
    float: right;
    margin-right: 35px;
    height: 42px;
    line-height: 42px;
}

.user img {
    width: 35px;
    height: 35px;
    vertical-align: middle;
    border-radius: 50px;
}

/* 轮播图 */
.banner {
    height: 420px;
    background-color: #1c036c;
}

.banner .wrapper {
    height: 420px;
    background-image: url(../images/Server.jpeg);
    background-size: cover;
}

.banner .left {
    float: left;
    padding: 0 20px;
    width: 190px;
    height: 420px;
    background-color: rgba(0, 0, 0, 0.4);

    line-height: 44px;
}

.banner .left span {
    float: right;
}

.banner .left a {
    font-size: 14px;
    color: #fff;
}

.banner .left a:hover {
    color: #00b4ff;
}

.banner .right {
    float: right;
    margin-top: 50px;
    width: 228px;
    height: 300px;
    background-color: #fff;
}

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

.banner .right .content {
    padding: 0 18px;
}

.banner .right .content dl {
    padding: 12px 0;
    border-bottom: 2px solid #e5e5e5;
}

.banner .right .content dt {
    font-size: 16px;
    color: #4e4e4e;
}

.banner .right .content dd {
    font-size: 14px;
    color: #4e4e4e;
}

.banner .right .more {
    display: block;
    width: 200px;
    height: 40px;
    margin: 4px auto 0;
    border: 1px solid #00a4ff;

    font-size: 16px;
    color: #00a4ff;
    font-weight: 700;

    text-align: center;
    line-height: 40px;
}

.banner .right .more:hover {
    background-color: #00a4ff;
    color: #fff;
}

/* 精品推荐 */
.goods {
    margin-top: 8px;
    height: 60px;
    background-color: #fff;
    box-shadow: 0px 2px 3px 0px rgba(118, 118, 118, 0.2);
    line-height: 60px;
}

.goods h2 {
    float: left;
    font-size: 16px;
    color: #00a4ff;
    margin: 0 34px;
}

.goods ul {
    float: left;
}

.goods ul li {
    float: left;
}

.goods li a {
    border-left: 1px solid #dfdfdf;
    padding: 0 35px;
    font-size: 16px;
    color: #000;
}

.goods .xingqu {
    float: right;
    margin: 0 26px;
    font-size: 14px;
    color: #00a4ff;
}

/* 精品推荐课程 */
.box {
    margin-top: 35px;

}

.box .title {
    height: 40px;
}

.box .title h2 {
    float: left;
    font-size: 20px;
    color: #494949;
}

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

.box .content li {
    float: left;
    margin-right: 15px;
    margin-bottom: 15px;
    width: 228px;
    height: 270px;
    background-color: #fff;
    box-shadow: 0px 2px 3px 0px rgba(118, 118, 118, 0.2);
}

.box .content li:nth-child(5n) {
    margin-right: 0;
}

.box .content li img {
    width: 228px;
}

.box .content li h3 {
    padding: 20px;
    font-size: 14px;
    color: #050505;
    font-weight: 400;
}

.box .content li p {
    padding: 0 20px;
    font-size: 12px;
    color: #999;
}

.box .content li span {
    color: #ff7c2d;
}

/* 版权 */
.footer {
    margin-top: 40px;
    padding-top: 30px;
    height: 417px;
    background-color: #fff;
}

.footer .left {
    float: left;
}

.footer .left p {
    margin: 20px 0 10px;
    font-size: 12px;
    color: #666;
}

.footer .left a {
    display: inline-block;
    width: 120px;
    height: 36px;
    border: 1px solid #00a4ff;

    text-align: center;
    line-height: 36px;
    font-size: 16px;
    color: #00a4ff;
}

.footer .left a:hover{
    color: #fff;
    background-color: #00b4ff;
}

.footer .right {
    float: right;
}

.footer .right dl {
    float: left;
    margin-left: 120px;
}

.footer .right dt {
    margin-bottom: 5px;
    font-size: 18px;
    color: #505050;
}

.footer .right a {
    font-size: 14px;
    color: #666;
}

/* hot 定位小图 */
.box .content li {
    position: relative;
}

.box .content li .hot {
    position: absolute;
    top: 4px;
    right: -4px;

    width: 50px;
    height: 50px;
}