body {
    margin: 0;
    padding: 0;
    font-family: 'Inter';
}

.flex-row-center {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}

.flex-row-space {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

.flex-column-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.flex-column-flex-start {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
}

.logo {
    font-size: 24px;
    margin-left: 20px;
}

.nav-links {
    margin-right: 20px;
    white-space: nowrap;
}

.nav-link-box {
    flex-wrap: wrap;
}

.nav-link {
    margin-left: 20px;
    padding: 13px;
    font-size: 14px;
    background: transparent;
    border: none;
    color: #ffffff;
    text-decoration: none;
}

.nav-link-item:hover {
    background: #fbfbfb1a;
}

.selected {
    border-bottom: 1px solid #ffffff;
}

.app-bar {
    width: 100%;
    color: #ffffff;
    font-size: 16px;
    padding: 0px 1rem;
    box-sizing: border-box;
    position: absolute;
}

.footer {
    padding: 12px;
    background-color: #ffffff;
    color: #666666;
    font-size: 12px;
    line-height: 17px;
}

.footer a {
    text-decoration: none;
    color: #333333;
}
.footer ul, p  {
    margin: 0;
}

.beian {
    padding: 10px;
}

.beian li {
    list-style: none;
    margin-right: 2rem;
}

.service-protocol {
    border-right: 1px solid #666666;
    padding: 0 10px;
}
.user-protocol {
    padding: 0 10px;
}
.protocol {
    flex-wrap: wrap;
}

@media screen and (max-width:600px){
    .beian {
        flex-wrap: wrap;
        padding: 0;
        justify-content: center;
    }
    .beian li {
        padding-bottom: 1rem;
    }
}