html {
    overflow: hidden;
}
body {
    overflow: hidden;
}
/* 导航 */
.nav {
    background-color: #fff; /*todo*/
    color: #000;
    list-style-type: none;
    position: fixed;
    width: 100%;
    overflow: hidden;
    box-shadow: 0 1px 2px 0 rgba(0,0,0,.1)
}
.nav li {
    float: left;
    border-right: 1px solid #f1f1f1; /*todo*/
}
.nav li a {
    font-size: 15px;
    letter-spacing: 1px;
    display: block;
    text-decoration: none;
    padding: 12px 16px;
    text-align: center;
    font-weight: bold;
}
.nav li a:hover {
    color: #000;
}
.nav li.right {
    float: right;
}

.nav-unselect {
    color: #666;
}
.nav-select {
    background-color: #f1f1f1;  /*todo*/
    color: #000;
}

/* 主体 */
#content {
    box-sizing: border-box;
    padding-top: 46px;
    width: 100%;
    height: 100%;
}

/* 底部 */
footer {
    border-top: 1px solid #e3e3e3;
    position: fixed;
    bottom: 0;
    right: 0;
    left: 0;
    text-align: center;
    font: 14px Helvetica Neue,Helvetica,PingFang SC,\5FAE\8F6F\96C5\9ED1,Tahoma,Arial,sans-serif;
    box-shadow: 0 -1px 2px 0 rgba(0,0,0,.0);
    box-sizing: border-box;
    background-color: #fff;
    z-index: 999;
    height: 30px;
    font-size: 13px;
    line-height: 30px;
}
footer a {
    color: #3573ab;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
}