body {
    line-height: 2;
    font-size: 16px;
    font-family: Microsoft YaHei, Helvetica Neue, Helvetica, Arial, sans-serif;
}

.wrap {
    width: 100%;
    margin: 0 auto;
    overflow: hidden;
}

.cont {
    width: 1200px;
    margin: 0 auto;
}

html,
body {
    margin: 0 auto;
}

a:hover,
a:active,
a:visited,
a:link {
    text-decoration: none;
}

.flex-sb {
    display: flex;
    flex-wrap: nowrap;
    justify-content: space-between;
}

.nav-wrap {
    height: 80px;
    overflow: visible;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
    background-color: transparent;
    transition: 500ms;
}

.nav-wrap.on {
    background: #3064D8;
    box-shadow: 0 0 40px 0 rgba(0, 0, 0, 0.06);
    transition: 500ms;
}

.nav-wrap .logo {
    line-height: 80px;
}

.nav-wrap .logo img {
    height: 50px;
}

.nav-wrap .nav-list {
    display: flex;
    flex-wrap: nowrap;
    justify-content: space-between;
}

.nav-wrap .nav-list a {
    display: block;
    line-height: 80px;
    padding: 0 20px;
    color: #fff;
    position: relative;
}

.nav-wrap .nav-list a::after {
    content: '';
    display: block;
    width: 0px;
    height: 0px;
    border-radius: 2px;
    background: #fff;
    position: absolute;
    left: 0;
    right: 0;
    margin: auto;
    bottom: 10px;
    transition: 300ms;
}

.nav-wrap .nav-list a:hover::after,
.nav-wrap .nav-list li.active a::after {
    content: '';
    display: block;
    width: 30px;
    height: 3px;
    border-radius: 2px;
    background: #fff;
    position: absolute;
    left: 0;
    right: 0;
    margin: auto;
    bottom: 10px;
    transition: 300ms;
}

.m-nav-btn {
    display: none;
}

section {
    padding: 80px 0;
}

.title-wrap {
    margin: 0 auto;
}

.content {
    padding-top: 50px;
}

@media (max-width: 768px) {
    .wrap {
        max-width: 7.5rem;
        overflow: hidden;
    }
    .wrap .cont {
        width: 6.9rem;
    }
    .nav-wrap {
        height: 1rem;
        overflow: visible;
    }
    .nav-wrap .logo {
        line-height: 1rem;
    }
    .nav-wrap .m-nav-btn {
        width: 0.6rem;
        height: 1rem;
        display: flex;
        justify-content: center;
        align-items: end;
        flex-direction: column;
    }
    .nav-wrap .m-nav-btn span {
        display: block;
        width: 0.6rem;
        height: 0.06rem;
        border-radius: 0.03rem;
        margin: 0.05rem 0;
        background-color: #fff;
        transition: 500ms;
        width: 100%;
    }
    .nav-wrap .m-nav-btn span:first-child {
        width: 50%;
    }
    .nav-wrap .m-nav-btn span:nth-child(2) {
        width: 75%;
    }
    .nav-wrap .m-nav-btn.active span:nth-child(1) {
        transform-origin: left;
        transform: rotate(46deg);
        margin-bottom: 0.1rem;
        transition: 500ms;
        width: 100%;
    }
    .nav-wrap .m-nav-btn.active span:nth-child(2) {
        width: 0;
        transition: 500ms;
    }
    .nav-wrap .m-nav-btn.active span:nth-child(3) {
        transform-origin: left;
        transform: rotate(-46deg);
        margin-top: 0.1rem;
        transition: 500ms;
    }
    .nav-wrap .nav-list {
        display: none;
        position: absolute;
        top: 1rem;
        right: 0;
        background-color: #3064D8;
        min-width: 2rem;
        text-align: center;
    }
    .nav-wrap .nav-list a {
        display: block;
        line-height: 0.8rem;
        color: #fff;
    }
}