* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Helvetica Neue", Arial, sans-serif;
}
a {
    text-decoration: none;
}

/* 会员中心蓝色导航 */
.member-nav {
    background-color: #0078d7;
    padding: 15px;
    display: flex;
    align-items: center;
    position: relative;
}

.member-nav .back-btn {
    color: #fff;
    font-size: 18px;
    text-decoration: none;
    margin-right: 10px;
}
.member-nav .back-btn img{
    width:20px;
}

.member-nav .nav-title {
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    flex: 1;
    text-align: center;
    margin-right: 30px;
}

.mobile-menu {
    width: 26px;
    height: 28px;
    position: relative;
    margin-left: 12px;
}
.mobile-menu span {
    width: 100%;
    height: 3px;
    background-color: #fff;
    position: absolute;
    left: 0;
    transition: all 0.5s;
    border-radius: 2px;
}
.mobile-menu span:nth-child(1){
    top: 4px;
}
.mobile-menu span:nth-child(2){
    top: 12px;
}
.mobile-menu span:nth-child(3){
    top: 20px;
}
.mobile-menu.active span:nth-child(1){
    top: 10px;
    transform: rotate(45deg);
}
.mobile-menu.active span:nth-child(2){
    opacity: 0;
}
.mobile-menu.active span:nth-child(3){
    top: 10px;
    transform: rotate(-45deg);
}

.menu{
    position:relative;
}
.header-nav{
    display:none;
    position:absolute;
    z-index:999;
    width:120px;
    background-color:#f9f4f4;
    right: 0;
    top: 40px;
}
.header-nav ul{
    padding:12px 0;
}
.header-nav ul li{
    list-style: none;
}
.header-nav ul li a{
    line-height:200%;
    color:#000;
    padding: 0px 24px;
}