#header{
    position: fixed;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    transition: all 200ms linear;
    z-index: 999;
}
#header .nav{
    display: flex;
    width: 80rem;
    justify-content: space-between;
    background-color: rgba(0, 0, 0, .5);
    border-radius: .6rem;
    overflow: hidden;
}
#header .nav ul{
    display: flex;
    width: 52rem;
    margin: 0;
    justify-content: space-around;
}
#header .nav ul li{
    list-style-type: none;
    flex: 1 0 auto;
}
#header .nav ul li a{
    display: flex;
    width: 100%;
    height: 100%;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    font-size: 1.1em;
    position: relative;
    transition: 200ms linear;
}
#header .nav ul li a:hover{
    background-color: rgba(0,0,0,.5);
}
.navBtn{
    display: none;
    width: 30px;
}
.navBtn span{
    display: block;
    width: 20px;
    border: solid 1px #000;
    transition: all 200ms linear;
}
.navBtn span:nth-child(2){
    margin: .3rem 0;
}
.navBtn.open span:nth-child(1){
    transform: translateY(2px) rotateZ(45deg);
}
.navBtn.open span:nth-child(2){
    margin: 0;
    opacity: 0;
}
.navBtn.open span:nth-child(3){
    transform: translateY(-2px) rotateZ(-45deg);
}
@media screen and (max-width:75rem) {
    #header{
        top: 0;
        left: 0;
        transform: none;
        width: 100%;
    }
    #header .nav{
        /* display: block; */
        width: 100%;
        border-radius: initial;
    }
    #header .nav img{
        display: none;
    }
    #header .nav ul{
        display: none;
        width: 100%;
        height: 100vh;
        padding-top: 4rem;
    }
    #header .nav ul li a{
        padding: 1rem 0;
        text-shadow: 1px 1px 5px #000;
    }
    .navBtn{
        display: block;
        position: fixed;
        top: 2rem;
        right: 2rem;
        z-index: 9999;
    }
}
#banner{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 40rem;
    overflow: hidden;
    background: url(../images/banner.jpg) no-repeat center/cover;
    margin-bottom: 6em;
}
#banner .title{
    background: rgba(0, 0, 0, .3);
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
#banner .title h1{
    font-size: 4em;
    color: white;
}
@media screen and (max-width:75rem){
    #banner{
        height: 20rem;
        margin-bottom: 3em;
    }
    #banner .title h1{
        font-size: 2em;
        color: white;
    }
}
#article{
    width: 80rem;
    margin-bottom: 3em;
}
#article h1{
    font-size: 3em;
    color: #2e2e2e;
}
#article>span{
    display: block;
    padding: .5em 0;
    font-size: 1.2em;
    border-bottom: solid 1px #e1e1e1;
    margin-bottom: 1em;
}
#article p{
    font-size: 1.3em;
    line-height: 2;
    margin-bottom: 1em;
}
#article img{
    max-width: 100%;
}
@media screen and (max-width:75rem){
    #article{
        width: 100%;
        padding: 0 2vw;
    }
    #article h1{
        font-size: 2em;
    }
    #article p{
        text-align: justify;
    }
}
#page{
    display: flex;
    width: 80rem;
    margin: 5em auto;
}
#page a,
#page b{
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 3em;
    height: 3em;
    padding: .5em;
    border: solid 2px #e5e5e5;
    text-align: center;
    margin: 0 .2em .2em;
    border-radius: 10px;
    text-decoration: none;
}
#page b{
    background: linear-gradient(45deg, #1e57cf, #4baafb);
    color: #fff;
}
@media screen and (max-width:75rem){
    #page{
        width: 100%;
        flex-wrap: wrap;
        padding: 0 2vw;
    }
}
#footer{
    background-color: #2e2e2e;
    padding: 5vh 0;
}
#footer .wrap{
    display: flex;
    width: 80rem;
    height: 100%;
}
#footer .wrap .nav{
    display: flex;
    width: 70%;
    position: relative;
}
#footer .wrap .nav::after{
    content: "";
    height: 50%;
    width: 1px;
    background-color: #585858;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
}
#footer .nav .item{
    flex: 1 0 auto;
}
#footer .nav .item h3{
    color: #ededed;
    font-size: 1.5rem;
    line-height: 3;
}
#footer a{
    color: rgb(200, 200, 200);
    text-decoration: none;
    display: block;
    line-height: 2;
}
#footer .lianxi{
    width: 30%;
    padding-left: 5em;
    text-align: center;
}
#footer .tel{
    color: #fff;
    line-height: 1.5;
    font-size: 2em;
    background: url(../images/phone-icon.png) no-repeat left center/contain;
    padding-left: 2em;
}
#footer .lianxi img{
    max-width: 100%;
    margin: 2em;
}
#footer .lianxi p{
    color: #fff;
}
@media screen and (max-width:75rem){
    #footer{
        width: 100%;
        padding: 5vh 2vw;
    }
    #footer .wrap{
        width: 100%;
        flex-direction: column;
    }
    #footer .wrap .nav{
        display: none;
    }
    #footer .wrap .lianxi{
        width: 100%;
        padding-left: 0;
    }
    #footer .lianxi .tel{
        width: 70%;
    }
}