body {
    background-color: #1b1b1b
}
img{ display: block; max-width: 100%;}
/*====================导航*********/
.header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
    height: 80px;
    padding: 0 30px;
    background: rgba(0, 0, 0, 0.5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

/*左侧logo*/

.header .left a img {
    height: 55px;
    margin-top: 12px;
}

.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: 80px;
    display: block;
}

.header .navbar_nav li {
    float: left;
    position: relative;
    display: block;
}

.header .navbar_nav li:after {
    content: "";
    width: 0;
    height: 2px;
    background: #2ca6ff;
    position: absolute;
    bottom: 0;
    left: 0;
    transition: all 0.5s ease 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: 16px;
}

.header .navbar_nav li:hover a {
    color: #2ca6ff;
}

.header .navbar_nav li.dropdown {
    display: inherit;
    position: relative;
}

.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;
    background: #fff;
    box-shadow: 0 15px 27px 0 rgba(167, 165, 165, 0.38);
    width: 120%;
    left: -10%;
}

.header .navbar_nav li.dropdown .dropdown_menu a {
    font-size: 14px;
    color: #666;
    padding: 10px;
    line-height: 20px;
    text-align: center;
    background: #fff;
    margin-bottom: 2px;
}

.header .navbar_nav li.dropdown:hover .dropdown_menu {
    display: block;
    background: #f3f3f3;
    -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: #666;
}

.header .navbar_nav li.dropdown:hover .dropdown_menu a:hover {
    color: #fff;
    background: #2ca6ff;
}

/*白色背景的头部*/
.header.on {
    background: #fff;
    border-bottom: 1px solid #ccc;
}

.header.on .left .img1 {
    display: none;
}

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

.header.on .navbar_nav li a {
    color: #333;
}

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

#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: #fff;
    transition: all ease 0.5s;
    -webkit-transition: all ease 0.5s;
    z-index: 1000;
    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;
	padding: 10px 0;
	background: #eee;
}

.m_nav .logo img {
    height: 50px;
    display: block;
    margin: 0 auto;
}

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

.m_nav .ul li {
    padding: 0 20px;
    border-bottom: 1px solid #f5f5f5;
    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: #333;
    font-size: 16px;
    height: 50px;
    line-height: 50px;
	width: 100%;
	text-align: center;
}

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

.m_nav .ul li.dropdown.active .dropdown_menu {
	display: block;
	padding: 20px 0;
}

.m_nav .ul li .dropdown_menu a {
    display: block;
    height: 40px;
	line-height: 40px;
	font-size: 14px;
    padding: 0 40px;
    box-sizing: border-box;
    border-bottom: 1px solid #eee;
}

.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 {
        height: 60px;
        padding: 0 10px;
    }

    .header #navToggle {
        height: 100%;
        padding: 9px 15px;
        margin-right: -15px;
        display: inline-block;
        float: right;
    }

    .header #navToggle span {
        position: relative;
        width: 25px;
        height: 1px;
        margin-top: 19px;
    }

    .header #navToggle span:before,
    .header #navToggle span:after {
        content: '';
        position: relative;
        width: 100%;
        height: 1px;
        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: #fff;
    }

    .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;
    }
}