html {
    font-family: "Open Sans", "open_sans", "Lucida Grande", "Verdana", "Pingfang SC", "Pingfang TC", "Hiragino Sans GB", "Microsoft YaHei", Cardo, STSong, "Songti SC", SimSun, "PingFang SC", "Microsoft YaHei", 微软雅黑, STXihei, 华文细黑, serif;
}

* {
    margin: 0;
    padding: 0;
}

ul li {
    list-style: none;
}

.nav.flxedNav {
    position: fixed;
    background: #fff;
    padding: 9px 0 8px;
    z-index: 210;
    width: 100%;
    box-shadow: 0 1px 1px rgba(0, 0, 0, .25);
}

.nav {
    color: #fff;
    position: absolute;
    text-align: center;
    width: 100%;
    top: 0;
    padding: 25px 0;
    z-index: 200;
}

.nav-left {
    width: 40%;
    text-align: right;
    display: inline-block;
    vertical-align: middle;
}

.nav-right {
    width: 40%;
    text-align: left;
    display: inline-block;
    vertical-align: middle;
}

.nav-item {
    display: inline-block;
    padding: 10px 25px;
    visibility: middle;
    font-size: 15px;
}

.nav a {
    color: #fff;
    text-decoration: none;
}

.nav a:hover {
    text-decoration: underline;
}

.nav.flxedNav a {
    color: #555;
}

.nav-center {
    max-width: 14%;
    margin: 0 1.25%;
    padding: 0 1.25%;
    min-width: 92px;
    display: inline-block;
    vertical-align: middle;
}

.nav-center img {
    width: 100%;
}

.modelOne {
    background: url(../img/169.jpg) no-repeat 50%;
    padding-top: 104px;
    padding-bottom: 80px;
    text-align: center;
    background-color: transparent;
    position: relative;
}

.modelOne::before {
    background: rgba(9, 10, 12, .4);
    content: "";
    display: block !important;
    height: 100%;
    left: 0;
    position: absolute;
    top: 0;
    transform-style: preserve-3d;
    width: 100%;
}

.modelOneContainer {
    width: 1152px;
    color: #fff;
    margin: 0 auto;
}

.s-font-title {
    font-size: 54px;
    font-weight: inherit;
    position: relative;
    margin-bottom: 15px;
}

.s-font-title p {
    font-size: 130%;
}

.s-text {
    font-size: 20px;
    margin-bottom: 10px;
    font-weight: inherit;
    position: relative;
}

.s-bright-arrow {
    bottom: 0;
    height: 25px;
    left: 0;
    position: absolute;
    width: 100%;
    z-index: 100;
}

.s-bright-arrow .a1,
.s-bright-arrow .a2 {
    border: 25px solid transparent;
    border-top: none;
    bottom: 0;
    box-sizing: border-box;
    height: 0;
    position: absolute;
    width: 50%;
}

.s-bright-arrow .a1 {
    border-right-color: transparent !important;
    left: 0;
}

.s-bright-arrow .a2 {
    border-left-color: transparent !important;
    right: 0;
}

.modelTwo {
    background: #fff;
    text-align: center;
    padding: 80px 0;
}

.modelTwoContainer {
    margin: 0 auto;
    padding: 0;
    position: relative;
    width: 1152px;
}

.modelTwoTitle {
    margin-bottom: 50px;
    font-size: 36px;
    font-weight: inherit;
    color: #222;
}

.modelTwoText p {
    color: #999;
    font-size: 15px;
    text-align: left;
    line-height: 1.7;
}

.modelThree {
    background: #2f343b;
    padding: 80px 0;
    text-align: center;
}

.modelThreeContainer {
    margin: 0 auto;
    padding: 0;
    position: relative;
    width: 1152px;
    color: #fff;
}

.modelThreeTitle {
    font-size: 36px;
    margin-bottom: 50px;
    font-weight: inherit;
    color: #fff;
}

.modelThreeText h3 {
    text-align: left;
    font-size: 24px;
    margin-bottom: 5px;
    font-weight: inherit;
}

.modelThreeText p {
    text-align: left;
    font-size: 15px;
}

.modelThreeText div {
    margin-bottom: 35px;
}

.modelFour {
    background: #2f343b;
    padding: 80px 0;
    text-align: center;
}

.modelFourContainer {
    margin: 0 auto;
    padding: 0;
    position: relative;
    width: 1152px;
    color: #fff;
}

.modelFourTitle {
    font-size: 36px;
    margin-bottom: 50px;
    font-weight: inherit;
    color: #fff;
}

.modelFourText p {
    color: #fff;
    font-size: 15px;
    text-align: left;
    line-height: 1.7;
}

.modelFourText div {
    margin-bottom: 20px;
}

.modelFourText p a {
    color: #fff;
}

.modelFourText p a:hover {
    color: #2be5ff;
}

.footer {
    background: #fff;
    font-size: 15px;
    color: #2f343b;
    padding: 80px 0;
    text-align: center;
}

.footer p {
    line-height: 1.7;
}

#menu_button_wrapper {
    display: none;
}

.hidden {
    display: none;
}

.phoneNav {
    display: none;
    position: fixed;
    z-index: 210;
}

@media only screen and (max-width: 727px) {

    .modelOneContainer,
    .modelTwoContainer,
    .modelThreeContainer,
    .modelFourContainer {
        margin: 0 auto;
        padding: 0;
        position: relative;
        width: 80%;
        color: #fff;
    }

    .nav-center {
        left: auto;
        max-width: 80%;
        position: static;
        width: 80%;
    }

    .nav-center img {
        max-height: 60px;
        width: auto;
    }

    .s-font-title {
        font-size: 36px;
    }

    .clearfix {
        clear: both;
    }

    .phoneNav {
        display: block;
        width: 100%;
        background: transparent;
    }

    #menu_button_wrapper {
        display: block;
        padding: 1em 0 0 1em;
        color: #9d9d9d;
        margin-bottom: .5em;

    }

    #menu_button {
        box-sizing: border-box;
        float: left;
        padding: .5em 1em;
        border-radius: 5px;
        color: white;
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        -khtml-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        background: #0dc5b9;
    }

    #menu_button:hover {
        cursor: pointer;
    }

    #hamburger {
        float: right;
        padding-top: .15em;
    }

    #menu_button span {
        display: block;
        background-color: #fff;
        width: 1.2em;
        height: .15em;
        border-radius: 1px;
        margin-bottom: .2em;
    }

    .nav-left,
    .nav-right {
        display: none;
    }

    #menu_list {
        width: 100%;
        margin: 0 auto;
        padding: 10px 20px;
        box-sizing: border-box;
        background: #fff;
    }

    #menu_list li {
        display: block;
        margin-bottom: 10px;
        border-bottom: 1px solid #ddd;
        padding: 10px;
    }

    #menu_list li a {
        width: 100%;
        display: block;
        color: #222;
        text-align: center;
        text-decoration: none;
    }
    .s-font-title p {
        font-size: 100%;
    }

}

@media only screen and (max-width: 1140px) and (min-width: 728px) {
    .nav {
        position: absolute;
        text-align: center;
        top: 0;
        width: 100%;
        z-index: 200;
        padding-top: 30px;
    }

    .nav-center {
        left: 25%;
        margin: 0;
        max-width: none;
        padding: 0;
        position: absolute;
        top: 15px;
        width: 50%;
    }

    .nav-center img {
        max-height: 60px;
        width: auto;
    }

    .nav-item {
        padding: 6px 10px;
    }

    .nav-left,
    .nav-right {
        padding-top: 60px;
        width:auto;
    }

    .nav.flxedNav img {
        max-height: 40px;
    }

    .modelOneContainer,
    .modelTwoContainer,
    .modelThreeContainer,
    .modelFourContainer {
        margin: 0 auto;
        padding: 0;
        position: relative;
        width: 960px;
        color: #fff;
    }

    .s-font-title p {
        font-size: 100%;
    }
}

@media only screen and (max-width: 875px) and (min-width: 728px) {

    .modelOneContainer,
    .modelTwoContainer,
    .modelThreeContainer,
    .modelFourContainer {
        margin: 0 auto;
        padding: 0;
        position: relative;
        width: 656px;
    }

    .s-font-title p {
        font-size: 100%;
    }
}

@media only screen and (max-width: 999px) and (min-width: 876px) {

    .modelOneContainer,
    .modelTwoContainer,
    .modelThreeContainer,
    .modelFourContainer {
        margin: 0 auto;
        padding: 0;
        position: relative;
        width: 656px;
    }
}

@media only screen and (max-width: 1349px) and (min-width: 1000px) {

    .modelOneContainer,
    .modelTwoContainer,
    .modelThreeContainer,
    .modelFourContainer {
        margin: 0 auto;
        padding: 0;
        position: relative;
        width: 960px;
    }
}
@media only screen and (max-width: 425px)  {
    .s-font-title {
        font-size: 24px;
    }
    .s-text{
        font-size: 16px;
    }
    .nav-center img{
        max-height: 40px;
    }
}