/* 导航 */
.nav {
    background-color: #333;
    list-style-type: none;
    position: fixed;
    width: 100%;
    overflow: hidden;
}
.nav li {
    float: left;
}
.nav li a {
    display: block;
    text-decoration: none;
    padding: 12px 16px;
    text-align: center;
}
.nav li a:hover {
    color: #fff;
}
.nav li.right {
    float: right;
}

.nav-unselect {
    color: rgba(255,255,255,.7);
}
.nav-select {
    background-color: #a62d2d;
    color: #fff;
}