* {
    margin: 0 auto;
    padding: 0;}

/*去除下划线*/
a {
    text-decoration: none;}

ul {
    list-style: none;}

.top {
    height: 400px;
    background-color: #2c8d8a;}

.picture {
    height: 400px;
    background-image: url(2.jpg);
    background-repeat: no-repeat;
    background-position: center;}

.topnav {
    background-color: #008271;}

.nav {
    width: 1500px;
    list-style: none;
    height: 60px;
    font-size: 15px;
    position: relative;
    background-color: #008271;}

li {
    float: left;}

.dropdown {
    display: inline-block;
    line-height: 60px;}

.dropdtn {
    color: white;
    text-align: center;
    padding: 15px 45px;}

.dropdown:hover {
    background-color: #20b7a4;
    color: white;
    transition: all 0.1s linear;
    opacity: 1;}

.pict {
    position: absolute;
    top: -36px;
    left: -6px;
    display: none;}

.case:hover .pict {
    display: block;}

.dropdown {
    position: relative;}

.pict1 {
    position: absolute;
    top: -36px;
    left: -8px;
    display: none;}

.case:hover .pict1 {
    display: block;}

.pict2 {
    position: absolute;
    top: -36px;
    left: -8px;
    display: none;}

.case:hover .pict2 {
    display: block;}

.case_content a {
    display: block; /*一定要转为块元素 */
    color: black;
    text-align: center;
    height: 46px;
    line-height: 46px;}

.case_content {
    display: none;
    position: absolute;}

.dropdown:hover .case_content {
    display: block;}

.case_content {
    background-color: #eef3ef;
    display: none;
    /* box-shadow: rgba(255,255,255,0.5);透明度 */
    box-shadow: 1px 1px 5px #888888;
    /*设置最高优先级，以免被盖住*/
    position: absolute;
    z-index: 10;
    width: 150px;}

.case_content a:hover {
    /*移入效果半透明，文字显示变白*/
    background-color: #20b7a4;
    color: white;
    transition: all 0.1s linear;
    opacity: 0.8;}

.case_content5 a {
    display: block;
    color: black;
    text-align: center;
    height: 46px;
    line-height: 46px;}

.case_content5 {
    display: none;
    position: absolute;}

.dropdown:hover .case_content5 {
    display: block;}

.case_content5 a:hover {
    /*移入效果半透明，文字显示变白*/
    background-color: #20b7a4;
    color: white;
    transition: all 0.1s linear;
    opacity: 0.8;}

.case_content5 {
    background-color: #eef3ef;
    display: none;
    box-shadow: rgba(255, 255, 255, 0.5);
    /*设置最高优先级，以免被盖住*/
    position: absolute;
    z-index: 10;
    width: 115px;}


/* 以上是头部 */
/* 主体 */
.main {
    width: 1175px;
    /* background-color: gold; */
    margin-top: 50px;
    overflow: hidden;}

.main_nav {
    width: 250px;
    height: 360px;
    /* background-color: red; */
    float: left;}

.main_content {
    width: 922px;
    min-height: 500px;
    /* background-color: greenyellow; */
    float: left;}

.nav_top {
    width: 250px;
    height: 60px;
    background-color: #20b7a4;
    font-size: 22px;
    line-height: 60px;
    text-align: center;
    color: white;
    border-bottom: 3.5px solid #d8d8d8;}

.nav_end a {
    display: block;
    padding-left: 50px;
    font-size: 18px;
    color: black;
    padding-top: 13px;
    width: 200px;
    height: 40px;
    border-bottom: 1.5px solid #d8d8d8;
    background-color: rgb(225, 239, 241);}

.nav_end :hover {
    background-color: #20b7a4;}

.cssul {
    margin-top: 15px;
    border-radius: 20%; /*圆角*/
    background-color: #dbdbdb;
    width: 5px;
    height: 5px;
    float: left;
    margin-top: 23px;
    margin-left: 30px;}

.word a {
    font-size: 13px;
    color: black;}

.work {
    color: black;
    font-size: 20px;
    line-height: 50px;
    font-weight: 600;
    float: left;
    margin-left: 30px;}

.more {
    float: right;
    line-height: 50px;
    font-size: 15px;
    margin-right: 30px;}

.line1 {
    width: 922px;
    height: 2px;
    /* text-align: center; */
    background-color: #bbbabb;
    position: absolute;
    bottom: 0px;
    left: 30px;}

.blue_line1 {
    width: 80px;
    height: 1.5px;
    background-color: #008271;
    float: left;
    position: absolute;
    bottom: 0px;}

.title_case {
    width: 922px;
    height: 50px;
    /* background-color: chocolate; */
    position: relative;}

.title a {
    font-size: 15px;
    color: #8a8887;line-height:50px;}

.title p {
    font-size: 15px;
    color: #8a8887;}

h2 {
    text-align: center;
    margin-top: 20px;
    font-size: 20px;}

.real_content p {
    margin: 15px 30px;
    color: black;}

.big_main {
    width: 1175px;}

/* 底部 */
.bottom {
    background-color: #009683;
    /* width: 2000px; */
    height: 60px;
    margin-top: 50px;
    position: relative;
    text-align: center;
    padding-top: 25px;}

.end {
    height: 160px;
    background-image: url(08.jpg);
    position: relative;
    text-align: center;}

select {
    border: none;
    outline: none;
    width: 100%;
    height: 30px;
    line-height: 30px;
    padding-left: 42px; /*文字间距 */
    background: url(12.jpg);
    color: #d7fffa;
    width: 140px;
    height: 30px;
    border: 1px solid #d7fffa;
    margin-left: 20px;
    /*很关键：将默认的select选择框样式清除*/
    appearance: none;
    -moz-appearance: none;
    -webkit-appearance: none;
    background: url(13.jpg) no-repeat scroll right center transparent;}

.link_text {
    color: white;
    font-size: 14px;}

select option {
    color: black;}

.inend1 {
    height: 30px;
    width: 350px;
    /* background-color: wheat; */
    margin-top: 40px;
    display: inline-block;}

.inend2 {
    height: 30px;
    width: 350px;
    /* background-color: violet; */
    margin-top: 40px;
    display: inline-block;}

.inend1 span {
    display: block;
    margin-top: 0px;
    color: #a7afc1;}

.inend2 span {
    display: block;
    margin-top: 0px;
    color: #a7afc1;}

.end img {
    float: left;}

.end p {
    color: #a7afc1;
    padding-top: 15px;}

.left {
    height: 600px;
    width: 240px;
    background-color: #f6f6f6;
    float: left;}

.first {
    height: 60px;
    width: 240px;
    background-color: #009683;
    text-align: center;}

.first a {
    color: white;
    display: inline-block;
    text-align: center;
    font-size: 25px;
    margin-top: 10px;}

.square0 {
    height: 1px;
    width: 240px;
    background-color: gray;
    float: left;}

.second {
    height: 50px;
    width: 240px;
    background-color: #f6f6f6;
    cursor: pointer;
    margin-top: 2px;}

.second a {
    color: #008271;
    font-size: 20px;
    text-decoration: none;
    line-height: 50px;
    margin-left: 16px;
    float: left;}

.circle0 {
    height: 7px;
    width: 7px;
    background-color: #008271;
    float: left;
    margin-top: 23px;
    margin-left: 20px;}

.img0 {
    width: 30px;
    height: 28px;
    background: url(16.jpg);
    float: right;
    margin-top: 13px;
    margin-right: 5px;}

.case2 {
    position: absolute;
    display: none;
    left: 100px;
    top: 0;
    font-size: 15px;
    width: 100%;
    background-color: #eef3ef;}


.case1:hover .case2 {
    display: block;}