body {
    background-color: #1b1b1b
}
/*====================导航*********/
.header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
    height: 80px;
    padding: 0 5%;
    background: rgba(0, 0, 0, 0.4);
}
    /*左侧logo*/
    .header .left {
        /*width: 12%;*/
        width: 16%;
    }

        .header .left a img {
            /*margin-top: 10px;
            width: 125px;*/
            margin-top: 16px;
            width: 110px;
            transition: all 0.5s linear 0s;
        }

        .header .left .img2 {
            display: none;
        }
    /*右侧*/
    .header .nav {
        -webkit-transition: 0.5s;
        -moz-transition: 0.5s;
        -o-transition: 0.5s;
        transition: 0.5s;
        height: 100%;
        line-height: 50px;
        display: block;
    }

    .header .navbar_nav li {
        float: left;
        position: relative;
        display: block;
        line-height: 85px; 
    }

        .header .navbar_nav li:after {
            content: "";
            width: 0;
            height: 2px;
            position: absolute;
            bottom: 0;
            left: 0;
            transition: all 0.5s linear 0s;
        }

        .header .navbar_nav li:hover:after {
            width: 100%;
        }

        .header .navbar_nav li a {
            text-decoration: none;
            height: 100%;
            padding: 0 25px;
            display: block;
            -webkit-transition: 0.5s;
            -moz-transition: 0.5s;
            -o-transition: 0.5s;
            transition: 0.5s;
            color: #fff;
            font-size: 14px;
            letter-spacing: 0.05em;
            font-weight: 100;
        }


@media (max-width: 1500px) {
    .header .navbar_nav li a {
        padding: 0 14px !important;
        color: #fff;
    }
}
    .header .navbar_nav li:hover a {
        color: #ffa200;
    }

    .header .navbar_nav li.dropdown {
        display: inherit;
        position: relative;
        line-height: 85px;
    }

        .header .navbar_nav li.dropdown .jt {
            width: 20px;
            height: 20px;
            background: url(i/top.png) no-repeat;
            background-size: 100% 100%;
            display: block;
        }

        .header .navbar_nav li.dropdown .dropdown_menu {
            display: none;
            position: absolute;
            top: 80px;
            width: auto;
            background-color: rgba(0, 0, 0, 0.4);
            box-shadow: 0 1px 7px 0 rgba(37, 37, 37, 0.3);
            /*width: 1000px;*/
            left: 10%;
            /*height: 440px;*/
            flex-direction:column;
            /*border:1px solid yellow;*/
        }

    .header.on .navbar_nav li.dropdown .dropdown_menu {
        /*border:1px solid yellow;*/
        /*display: none;*/
        /*display:flex;*/
        flex-direction:column;
        position: absolute;
        top: 60px;
        width: auto;
        background-color: rgba(0, 0, 0, 0.63);
        box-shadow: 0 1px 7px 0 rgba(37, 37, 37, 0.78);
        /*        width: 1000px;*/
        left: 10%;
        height: auto;
        line-height : 40px !important;
    }

        .header.on .navbar_nav li.dropdown .dropdown_menu a{
            display:block !important;
            /*border:1px solid green;*/
            height:45px;
        }

        .header.on .left a img {
            margin-top: 5px;
            width: 110px;
        }

.header .navbar_nav li.dropdown .dropdown_menu a {
    font-size: 14px;
    color: #fff;
    padding: 0 10px;
    line-height: 40px !important;
    text-align: center;
    margin-bottom: 2px;
    letter-spacing: 0.05em;
    width: auto;
    margin: 0 10px 0 10px;
    height: 45px;
    /*width: 120px;
            border:1px solid red;*/
}

    .header .navbar_nav li.dropdown:hover .dropdown_menu {
        display: inline-flex;
        background-color: rgba(0, 0, 0, 0.63);
        -webkit-transition: 0.5s;
        -moz-transition: 0.5s;
        -o-transition: 0.5s;
        transition: 0.5s;
    }

        .header .navbar_nav li.dropdown:hover .dropdown_menu a {
            color: #fff;
        }

            .header .navbar_nav li.dropdown:hover .dropdown_menu a:hover {
                color: #ffa200;
            }
    /*黑色背景的头部*/
    .header.on {
        background: rgba(0, 0, 0, 0.7);
        height: 60px;
    }

        .header.on .left .img2 {
            display: block;
        }

        .header.on .navbar_nav li a {
            color: #fff;
            height: 60px;
            line-height: 60px !important;
        }

        .header.on .navbar_nav li:hover a {
            color: #ffa200;
        }

    .ennavcn {
        float: right;
        color: #fff;
        line-height: 80px;
        font-weight: lighter;
    }

    .header.on .ennavcn {
        line-height: 60px !important;
    }

    #navToggle {
        display: none;
    }

.m_nav {
    position: fixed;
    top: 0px;
    box-shadow: 0 15px 27px 0 rgba(167,165,165,0.38);
    width: 100%;
    height: 100%;
    background: #000;
    transition: all ease 0.5s;
    -webkit-transition: all ease 0.5s;
    z-index: 1001;
    opacity: 1;
    visibility: visible;
    margin-top: 0;
    overflow-y: auto;
    transition: all .6s cubic-bezier(.77, 0, .175, 1) 0ms;
    top: 0;
    transform: translateX(100%);
}

        .m_nav.open {
            transform: translateX(0);
        }

        .m_nav .top {
            height: 60px;
            padding: 20px;
            box-sizing: border-box;
        }

            .m_nav .top .closed {
                width: 30px;
                height: 30px;
                vertical-align: middle;
                float: right;
                cursor: pointer;
            }

        .m_nav .logo {
            width: 100%;
            margin: 0 auto;
        }

            .m_nav .logo img {
                height: 50px;
                display: block;
                margin: 30px auto;
            }

        .m_nav .ul {
            margin-top: 30px;
        }

            .m_nav .ul li {
                padding: 0 20px;
                border-bottom: 1px solid #252323;
                transform: translateY(0);
                -webkit-transform: translateY(100%);
                transform: translateY(100%);
                -webkit-transition: all .6s cubic-bezier(.77, 0, .175, 1) 0ms;
                transition: all .6s cubic-bezier(.77, 0, .175, 1) 0ms;
                opacity: 0;
            }

        .m_nav.open .ul li {
            opacity: 1;
            -webkit-transform: translateY(0);
            transform: translateY(0);
        }

        .m_nav .ul li:nth-child(1) {
            -webkit-transition: all .2s cubic-bezier(.77, 0, .175, 1) 0ms;
            transition: all .2s cubic-bezier(.77, 0, .175, 1) 0ms;
        }

        .m_nav .ul li:nth-child(2) {
            -webkit-transition: all .4s cubic-bezier(.77, 0, .175, 1) 0ms;
            transition: all .4s cubic-bezier(.77, 0, .175, 1) 0ms;
        }

        .m_nav .ul li:nth-child(3) {
            -webkit-transition: all .6s cubic-bezier(.77, 0, .175, 1) 0ms;
            transition: all .6s cubic-bezier(.77, 0, .175, 1) 0ms;
        }

        .m_nav .ul li:nth-child(4) {
            -webkit-transition: all .8s cubic-bezier(.77, 0, .175, 1) 0ms;
            transition: all .8s cubic-bezier(.77, 0, .175, 1) 0ms;
        }

        .m_nav .ul li:nth-child(5) {
            -webkit-transition: all 1.0s cubic-bezier(.77, 0, .175, 1) 0ms;
            transition: all 1.0s cubic-bezier(.77, 0, .175, 1) 0ms;
        }

        .m_nav .ul li:nth-child(6) {
            -webkit-transition: all 1.2s cubic-bezier(.77, 0, .175, 1) 0ms;
            transition: all 1.2s cubic-bezier(.77, 0, .175, 1) 0ms;
        }

        .m_nav .ul li a {
            display: block;
            text-decoration: none;
            color: rgb(218, 218, 218);
            font-size: 14px;
            height: 50px;
            line-height: 50px;
            width: 100%;
        }

        .m_nav .ul li .dropdown_menu {
            display: none;
        }

        .m_nav .ul li.dropdown.active .dropdown_menu {
            display: block;
        }

        .m_nav .ul li .dropdown_menu a {
            display: block;
            height: 50px;
            line-height: 50px;
            padding: 0 40px;
            box-sizing: border-box;
            border-bottom: 1px solid #252323;
        }

            .m_nav .ul li .dropdown_menu a:last-child {
                border: none;
            }

    .banner {
        width: 100%;
    }

        .banner img {
            width: 100%;
        }

    @media screen and (max-width: 992px) {
        .header {
            padding: 0 10px;
        }

            .header #navToggle {
                height: 100%;
                padding: 0px 15px;
                margin-right: -15px;
                display: inline-block;
                float: right;
            }

                .header #navToggle span {
                    position: relative;
                    width: 20px;
                    height: 2px;
                    margin-top: 19px;
                }

                    .header #navToggle span:before,
                    .header #navToggle span:after {
                        content: '';
                        position: relative;
                        width: 100%;
                        height: 2px;
                        left: 0;
                    }

                    .header #navToggle span,
                    .header #navToggle span:before,
                    .header #navToggle span:after {
                        -webkit-transition: 0.3s;
                        -moz-transition: 0.3s;
                        -o-transition: 0.3s;
                        transition: 0.3s;
                        display: block;
                        background: #ffffff;
                    }

                        .header #navToggle span:before {
                            top: 8px;
                        }

                        .header #navToggle span:after {
                            bottom: 10px;
                        }

                .header #navToggle.open span:before {
                    top: 10px;
                    -webkit-transform: translateY(-11px) rotate(-45deg);
                    -moz-transform: translateY(-11px) rotate(-45deg);
                    -ms-transform: translateY(-11px) rotate(-45deg);
                    -o-transform: translateY(-11px) rotate(-45deg);
                    transform: translateY(-11px) rotate(-45deg);
                }

                .header #navToggle.open span:after {
                    bottom: 12px;
                    -webkit-transform: translateY(10px) rotate(45deg);
                    -moz-transform: translateY(10px) rotate(45deg);
                    -ms-transform: translateY(10px) rotate(45deg);
                    -o-transform: translateY(10px) rotate(45deg);
                    transform: translateY(10px) rotate(45deg);
                }

                .header #navToggle.open span {
                    background: none;
                }

                    .header #navToggle.open span:before,
                    .header #navToggle.open span:after {
                        background: #4f4f4f;
                    }

            .header .nav {
                display: none;
            }

        .banner img {
            height: 600px;
            object-fit: cover;
        }
    }