* {
    padding: 0;
    margin: 0;
    
}

header {
    height: 60px;
    width: 100%;
    position: fixed;
    z-index: 99;
}

header::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
}

#check {
    display: none;
}

h1 {
    position: absolute;
    left: 20px;
    top: 0;
    line-height: 60px;
    background-image: url(images/logo.svg);
    background-repeat: no-repeat;
    background-position: center;
    width: 200px;
}

h1 a {
    text-decoration: none;
    color: rgba(0, 0, 0, 0);
}

.daohang {
    position: absolute;
    left: 250px;
    top: 0;
    line-height: 60px;
}

.daohang a {
    text-decoration: none;
    color: #ffffff;
    padding: 8px 30px;
    border-radius: 10px;
}

.daohang a:hover,
.daohang a.active {
    background: #ffffff;
    color: #000000;
}

.daohang li {
    display: inline;
}

.menu {
    display: none;
}

footer {
    background-color: #000000;
    color: #B7B7B7;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
    z-index: 99;
}

/* 平板屏幕 */
@media screen and (max-width: 872px) {

header h1 {
    left: 50%;
    transform: translateX(-50%);    
    top: 0;
}

.daohang{
    position: absolute;
    top: 100%;
    left: auto;
    right: 1.5rem;
    width: 200px;
    height: 0;
    border-radius: 20px;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(15px);
    transition: .3s ease;
    overflow: hidden;
}

#check:checked~.daohang {
    height: 300px;
}

.daohang a{
    display: flex;
    padding: 0;
    justify-content: center;
    border-radius: 20px;
    background: rgba(0, 0, 0, 0);
}

.menu {
    display: block;
    background-color: transparent;
    color: white;
    font-size: 40px;
    position: absolute;
    top: 1px;
    right: 1.5rem;
    border: none;
    cursor: pointer;
    z-index: 2;
}

.menu2 {
    font-size: 40px;
    right: 1.5rem;
    display: none;
}

#check:checked~.menu #menu1 {
    display: none;
}

.menu #bx-x{
    display: none;
}

#check:checked~.menu #menu2 {
    display: block;
}

}
/* 手机屏幕 */
@media screen and (max-width: 540px) {
    .daohang{
    right: auto;
    width: 100%;
    border-radius: 0;
    }
    .daohang a {
        border-radius: 0;
    }
}