html {
    scroll-behavior: smooth;
}

.head-innernav {
    max-height: calc(100vh - 140px);
    overflow-y: auto;
}

.navs:hover > .head-innernav,
.navs:focus-within > .head-innernav,
.navs.is-open > .head-innernav {
    display: block;
}

.navs > a:focus-visible,
.head-innernav a:focus-visible {
    outline: 2px solid #fff;
    outline-offset: -4px;
}

.page-anchor {
    scroll-margin-top: 155px;
}

.renwen-box.is-unavailable {
    cursor: not-allowed;
    filter: grayscale(1);
    opacity: 0.72;
}

@media (max-width: 1100px) {
    .head-bottom {
        box-sizing: border-box;
        display: flex;
        align-items: center;
        width: 100%;
        min-width: 0;
        padding: 0 16px;
    }

    #logo {
        flex: 0 0 180px;
        padding: 25px 0;
    }

    #logo img {
        width: 180px;
        height: auto;
    }

    .head-nav {
        display: flex;
        flex: 1 1 auto;
        float: none;
        min-width: 0;
        margin: 0 8px;
    }

    .navs {
        flex: 1 1 auto;
        float: none;
    }

    .navs > a {
        padding: 0 6px;
        font-size: 14px;
        white-space: nowrap;
    }

    .top-btn {
        flex: 0 0 auto;
        float: none;
    }

    .navs:nth-last-child(-n + 2) > .head-innernav {
        right: 0;
        left: auto;
    }
}

@media (max-width: 860px) {
    header {
        height: 196px;
    }

    .head-bottom {
        flex-wrap: wrap;
        min-height: 156px;
    }

    .head-nav {
        order: 3;
        flex: 0 0 100%;
        margin: 0;
    }

    .navs > a {
        padding: 0 4px;
        line-height: 56px;
    }

    .head-innernav {
        top: 56px;
        width: 180px;
        max-height: calc(100vh - 196px);
    }

    .head-innernav > .havesan > .yulan {
        display: none !important;
    }
}

@media (max-width: 620px) {
    .head-nav {
        overflow-x: auto;
    }

    .navs {
        flex: 0 0 auto;
    }

    .navs > a {
        padding: 0 12px;
    }
}