nav {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.nav-container {
    line-height: 6.25rem;
    background-color: rgba(255,255,255,0.8);
}

    .nav-container .nav-logo {
        float: left;
        margin-left: 7vw;
    }

    .nav-container .nav-menu {
        float: right;
        margin-right: 5%;
        width: 70vw;
        text-align: right;
    }

.nav-logo {
}

.nav-menu ._phone-bg {
    position: absolute;
    top: 88px;
    display: none;
    width: 100vw;
    height: 100vh;
    z-index: -1;
}

.nav-logo img {
    vertical-align: middle;
    width: 12.06rem;
    cursor: pointer;
}

.nav-menu {
}

    .nav-menu ul {
        list-style: none;
        margin: 0;
        padding: 0;
    }

        .nav-menu ul li {
            display: inline-block;
            font-size: 1.125rem;
            /* margin-right: 2rem; */
            position: relative;
            padding: 0px 1%;
        }

            .nav-menu ul li:hover {
                cursor: pointer;
            }

            .nav-menu ul li a {
                text-decoration: none;
                color: black;
                display: inline-block;
                width: 100%;
                height: 100%;
            }

                .nav-menu ul li a:hover {
                    color: #ff4951;
                }

    .nav-menu .second-menu {
        position: absolute;
        background-color: rgba(255,255,255,0.8);
        left: 0;
        right: 0;
        display: none;
    }

        .nav-menu .second-menu ul {
            padding: 0px;
            text-align: center;
        }

            .nav-menu .second-menu ul li {
                margin-right: 0px;
                font-size: 1rem;
                line-height: 47px;
                padding: 0px;
                display: block;
            }

                .nav-menu .second-menu ul li:hover {
                    color: #ff4951;
                }

    .nav-menu ul li:hover .second-menu {
        display: block;
    }

@media(min-width:769px) and (max-width:1400px) {
    .nav-container {
        line-height: 70px;
    }

        .nav-container .nav-logo {
            margin-left: 5%;
        }

    .nav-logo img {
        width: 9rem;
        vertical-align: middle;
    }

    .nav-menu ul li {
        font-size: 1rem;
        /*margin-right: 1rem;*/
    }

    .nav-container .nav-menu {
        margin-right: 1rem;
    }
    .nav-container .nav-menu {
        width: 75vw;
    }
    .nav-menu ul li {
        padding: 0px 0.8rem;
    }
}
@media(max-width:1279px) and (min-width:769px) {
    .nav-container .nav-menu {
    width:77vw;
    }
    .nav-menu ul li {
        padding: 0px 1%;
    }
    .nav-container .nav-logo {
        margin-left: 3%;
    }
}
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .nav-icon {
        display: block;
        float: right;
        margin-right: 16px;
        width: 36px;
        height: 100%;
    }

    .nav-container .nav-logo {
        margin-left: 16px;
    }

    .nav-container {
        line-height: 60px;
    }

    .nav-logo img {
        height: 30px;
        width: auto;
    }

    .nav-icon img {
        vertical-align: middle;
        height: 14px;
    }

    _aihecong_chat_button_body {
        position: fixed !important;
        bottom: 10px;
        right: 10px;
    }

    .nav-container .nav-menu {
        float: none;
        width: 100%;
        background-color: rgba(255,255,255,0.8);
        padding-top: 44px;
    }

    .nav-menu ul li {
        display: block;
        line-height: 40px;
        margin-right: 40px;
        border-bottom: 1px solid #e0e0e0;
        font-weight: bold;
        font-size: 1rem;
    }

    .nav-menu ._phone-bg {
        display: block;
    }

    .nav-menu ul {
        text-align: left;
    }

    .nav-menu .second-menu {
        position: relative;
        /* width: 100%; */
        margin-right: -16px;
        margin-left: -16px;
        text-align: left;
        background-color: rgba(255,255,255,0.01);
    }

        .nav-menu .second-menu ul li {
            text-align: left;
            padding-left: 35px;
            background-color: transparent;
            position: relative;
            line-height: 40px;
        }

    .nav-menu .first:after {
        position: absolute;
        top: 13px;
        width: 0;
        height: 0;
        right: 0;
        margin-left: -10px;
        content: " ";
        border-top: 10px solid #ff4951;
        border-left: 10px solid transparent;
        border-right: 10px solid transparent;
        transform: rotate(-90deg);
    }
}