.pcheader {
    height: 94px;
}
@media screen and (max-width:1600px){
    .nav{width:60%;}
    .certificate{ margin-left:-70px;}
    .certificate ul li a{ margin-left:70px;}
}

@media screen and (max-width:1440px){
    .nav{ width:65%;}
    .plebans{ font-size:16px;}
    .ab_txt{ font-size:15px;}
    .certificate{ margin-left:-60px;}
    .certificate ul li a{ margin-left:60px;}
}
@media screen and (max-width:1300px){
    .nav{ width:65%;}
}
@media screen and (max-width:1024px){
    .pcheader {
    display: none;
}
    .w{ width:95%;}
    .head,.pages em,.sider,.location,.right-menu{ display:none;}
    .sjhedes{ display:block;}
    .nyban .w{ justify-content:center;}
}