nav {
    width: 100%;
    height: 5vw;
    color: #005ccb;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #012a7d;
}

nav>ul {
    width: 90vw;
    display: flex;
    align-items: center;
}

nav>ul>li {
    flex: 1;
    white-space: nowrap;
    text-align: center;
}

nav>ul>li a {
    color: white;
    padding-left: 10px;
    padding-right: 10px;
    border-radius: 5px;
}

nav>ul[data-this="index/index"]>li[data-name="index/index"] a,
nav>ul[data-this="index/index/introduction"]>li[data-name="index/index/introduction"] a,
nav>ul[data-this="index/index/schedule"]>li[data-name="index/index/schedule"] a,
nav>ul[data-this="index/index/organizational"]>li[data-name="index/index/organizational"] a,
nav>ul[data-this="index/index/notice"]>li[data-name="index/index/notice"] a,
nav>ul[data-this="index/index/registration"]>li[data-name="index/index/registration"] a,
nav>ul[data-this="index/index/contribution"]>li[data-name="index/index/contribution"] a,
nav>ul[data-this="index/index/contact"]>li[data-name="index/index/contact"] a,
nav>ul[data-this="index/index/hotel"]>li[data-name="index/index/hotel"] a {
    background-color: #0448e5;
    color: white;
}

nav>button.menu {
    width: 6vw;
    height: 6vw;
    display: none;
}

@media screen and (max-width: 768px) {
    body {
        display: flex;
        flex-direction: column;
    }

    nav {
        order: -1;
        padding-block: 2vw;
    }

    nav>ul>li a {
        font-size: 4vw;
    }

    nav>ul>li {
        flex: 0;
        overflow: hidden;
    }

    nav>ul[data-this="index/index"]>li[data-name="index/index"],
    nav>ul[data-this="index/index/introduction"]>li[data-name="index/index/introduction"],
    nav>ul[data-this="index/index/schedule"]>li[data-name="index/index/schedule"],
    nav>ul[data-this="index/index/organizational"]>li[data-name="index/index/organizational"],
    nav>ul[data-this="index/index/notice"]>li[data-name="index/index/notice"],
    nav>ul[data-this="index/index/registration"]>li[data-name="index/index/registration"],
    nav>ul[data-this="index/index/contribution"]>li[data-name="index/index/contribution"],
    nav>ul[data-this="index/index/contact"]>li[data-name="index/index/contact"],
    nav>ul[data-this="index/index/hotel"]>li[data-name="index/index/hotel"] {
        flex: unset;
        font-size: 3.5vw;
        background-color: #0448e5;
        color: white;
        padding-left: 3vw;
        padding-right: 3vw;
        border-radius: 5px;
    }

    nav>ul>li a {
        background: unset !important;
    }

    nav>button.menu {
        display: block;
    }
}