* {
    margin: 0;
    padding: 0;
}
body {
    background-color: #e9f4d5;
}
.clearfix:before,.clearfix:after {
    content:"";
    display: table;
}
.clearfix::after {
    clear:both;
}
.clearfix {
    *zoom:1;
}
/* 申明版心类，只要像放到中间调用即可 */
.w {
    width: 1200px;
    margin: 0  auto;
}
/* 只是写错了 */
.s {
    width: 1200px;
    margin: 0  auto;
}
/* 只要是页面中的所有li都要清除样式 */
li {
    list-style: none;
}
a {
    text-decoration: none;
}
.header {
    height: 52px;
    background-color: #D6EFA8;
    margin: 30px auto;
}
.logo {
    float: left;
    width: 133px;
    height: 52px;
    background-color: purple;
}
.nav {
    float: left;
    margin-left: 60px;
}
.nav ul li {
    float: left;
    margin-right: 20px;
    padding: 13px;
    border: 1px solid lightblue;

}
.nav ul li a {
    font-size: 18px;
    color: black;
}
.nav ul li:hover {
    border-bottom: 3px solid lightblue;
}
.search {
    float: left;
    /* search的width是412px */
    width: 412px;
    height: 52px;
    background-color: #ceed94;
    margin-left: 50px;
}
.search input {
    float: left;
    /* input的width是345px */
    width: 345px;
    height: 47px;
   border: 2px solid #ceed94;
   color: #bfbfbf;
   font-size: 14px;
   padding-left: 15px;
}
.search button {
    float: left;
    /* 那为什么button的width是50px就会掉下来了 */
    width: 45px;
    height: 52px;
    background: url(./image/ikunsearch.png);
    /* 按钮有边框需要手动取出 */
    border: 0;
}
div .user {
    float: left;
    line-height: 52px;
    margin-left: 50px;
}
div p {
    float: right;
    margin-left: 20px;
}
.banner {
    height: 421px;
    background-color: #B3CBEF;

}
.banner .w {
    height: 421px;
    background-image: url(./image/handsome.jpg);
    background-repeat: no-repeat top center;
    background-size: 1200px 421px;
}
.subnav {
    float: left;
    width: 190px;
    height: 421px;
    background: rgba(172, 211, 240, .5);
}
.w .subnav ul li a {
    font-size: 20px;
    color:rgb(116, 118, 120);
}
.w .subnav ul li {
    /* background-color: rgb(172, 211, 240); */
    height: 47px;
    padding: 0 20px;
}
.w .subnav ul li:hover {
    background: #ceed94;
}
.subnav ul li a span {
    float: right;
}
.course {
    float: right;
    margin-top: 50px;
    width: 230px;
    height: 340px;
    background-color: rgba(172, 211, 240,.3);
}
.course h2 {
    height: 48px;
    background-color: rgba(172, 211, 240);
    text-align: center;
    line-height: 48px;
    font-size: 18px;
    color: #fff;
}
.bd {
    padding: 0 20px;
}
.course .bd ul li {
    padding: 20px 0;
    border-bottom: 2px solid #fff;
}
.course .bd ul li h4{
    padding-left: 20px;
    color: #4e4e4e;
}
.course .bd ul li:hover {
    background-color: #ceed94;
}
.course .bd ul li p {
    float: left;
    color: #a5a5a5;

}
.course .bd ul li p .last {
    margin-bottom: 30px;
}
.course .bd   a {
        display: block;
        border:1px solid  rgb(123, 187, 236);
        padding-left: 20px;
        color: whitesmoke;
        height: 38px;
        line-height: 38px;
        font-size: 16px;
}
.goods {
    height: 60px;
    background-color:whitesmoke; 
    box-shadow: 0 4px 3px 3px rgba(0,0,0,.3);
    margin-top: 10px;
    line-height: 60px;
}
.goods h3 {
    float: left;
    margin-left: 30px;
    color: #cfe5a7;
}
.goods ul {
    float: left;
}
.goods ul li {
    float: left;
}
.goods ul li a {
    padding: 0 30px;
    color: #050505;
    border-left: 2px solid #ceed94 ;
}
.mod {
    float: right;
    margin-right: 30px;
    color: #cfe5a7;
}
.box {
    margin-top: 30px;
}
.box-hd {
    height: 45px;
}
.box-hd h3 {
    float: left;
    font-size: 20px;
    color: #494949;
}
.box-hd a {
    float: right;
    font-size: 12px;
    color: #a5a5a5;
}
.box-bd ul  {
    width: 1225px;
}
.box-bd ul li {
    float: left;
    width: 225px;
    height: 320px;
    background-color: whitesmoke;
    margin-left: 15px;
    margin-bottom: 15px;
}
.box-bd ul li img {
    width: 100%;
    height: 200px;
}
.box-bd ul li h4 {
    margin: 20px 20px 20px 25px;
    font-size: 14px;
    color: plum;
    /* 给定标题不加粗 */
    font-weight: 400;

}
.box-bd ul li .info {
    margin-left: 20px;
    color: #999;
    font-size: 12px;
}
.footer {
    height: 415px;
    background-color:  #D6EFA8;
}
.footer .s {
    padding-top: 35px;
}
.footer .s .copyleft img {
    width: 300px;
    height: 200px;
}
.copyleft {
    float: left;
}
.link {
    float: right;
}
.footer .s .copyleft  .name {
    float: none;
    font-size: 12px;
    color: #666;
    margin: 20px 0 15px 0 ;;
}
.footer .s .copyleft .app {
    display: block;
    width: 118px;
    height: 33px;
    border: 2px solid #00a4ff;
    line-height: 33px;
    color:#00a4ff ;
    text-align: center;
    font-size: 16px;
   
}
.link dl {
    float: left;
}
.link dl dt {
    margin-right: 150px;
    font-size: 16px;
    color: #333;
    margin-bottom: 5px;
}
.link dl dd a {
    font-size: 12px;
    color: #333;
}