/* 头部 - 导航栏 */
.c-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    transition: background 0.5s ease;
}

.c-nav > .c-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.c-nav .logo {
    height: 40px;
}

.c-nav .nav-group {
    display: none;
}

.c-nav .nav-group .nav1 {
    padding: 3rem 0;
    width: 9rem;
    text-align: center;
}

.c-nav .nav1 > .item {
    margin-left: 3rem;
}

.c-nav .nav1 .item.active,
.c-nav .nav1 .item:hover {
    font-weight: bold;
}

.c-nav.hover .nav1 > .item {
    color: black;
}

/* 二级菜单 */
.c-nav .nav-group .nav1:hover > .nav2-group {
    display: block;
}

.c-nav .nav2-group {
    display: none;
    position: fixed;
    top: 100px;
    left: 0;
    right: 0;
    background-color: #fff;
    border-top: 1px solid #eee;
}

.c-nav .nav2-group > .inner {
    display: flex;
    padding-top: 4rem;
    padding-bottom: 4rem;
    min-height: 200px;
}

.c-nav .nav2-group > .inner > .nav2 {
    display: flex;
    flex-direction: column;
    padding-left: 2rem;
    padding-right: 2rem;
    border-right: 1px solid #eee;
}

.c-nav .nav2-group > .inner > .nav2 > .nav2-name {
    margin-bottom: 1.2rem;
}

.c-nav .nav2 > .link {
    color: black;
    font-size: 1rem;
    color: #666;
    line-height: 2;
}

.c-nav .mobile-nav-btn {
    color: white;
    font-size: 1.7rem;
    margin-left: auto;
    color: black;
}

.c-nav .mobile-nav-btn .closed {
    display: none;
}

.c-nav .popup-menu {
    display: none;
    position: fixed;
    top: calc(2rem + 40px);
    left: 0;
    right: 0;
    padding: 1.5rem;
    padding-top: 0.7rem;
    background-color: #fff;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
    max-height: 80vh;
    overflow-y: auto;
}

.c-nav .popup-menu .nav {
    border-bottom: 1px solid #eee;
    line-height: 3rem;
}

.c-nav .popup-menu .nav.nav1.active {
    font-weight: bold;
}

.c-nav .popup-menu .nav.nav2 {
    padding-left: 1rem;
    color: #666;
}

@media (min-width: 1024px) {
    .c-nav .logo,
    .c-nav .logo-white {
        height: 60px;
        margin-top: 0;
        margin-bottom: 0;
    }

    .c-nav .nav-group {
        display: flex;
        align-items: baseline;
        font-size: 1.25rem;
        line-height: 1.75rem;
        line-clamp: 1;
    }

    .c-nav .mobile-nav-btn {
        display: none;
    }
}