/* 清除内外边距 */
* {
    margin: 0;
    padding: 0;
}

li {
    list-style: none;
}

/* 背景图 */
#background {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -2;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: 50% 50%;
    background-color: #818181;
    background-image: url(../img/background.jpg);
}

#background:after {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    content: '';
    z-index: -1;
    position: fixed;
    background-color: rgba(0, 0, 0, .2);
}

.main {
    position: absolute;
    top: 50%;
    left: 50%;
    height: 550px;
    width: 1200px;
    margin-top: -275px;
    margin-left: -600px;
    background-color: rgba(0, 0, 0, .2);
    border-radius: 8px;
}

.left {
    float: left;
    height: 100%;
    width: 400px;
    background-color: rgba(150, 150, 150, .4);
    border-radius: 8px 0 0 8px;
}

.right {
    float: left;
    width: 800px;
}

/* logo部分 */
.logo {
    width: 100%;
    height: 200px;
    background-color: rgba(0, 0, 0, 0);
    border-top-left-radius: 8px;
}

.logo1 {
    float: left;
    background-image: url(../img/logo.jpg);
    border-radius: 50%;
    height: 150px;
    width: 150px;
    background-size: cover;
    background-repeat: no-repeat;
    box-shadow: 0 0 8px 0 rgb(0 0 0 / 55%);
    margin: 25px 60px 25px 20px;
}

.logo2 {
    float: left;
    line-height: 180px;
    font-size: 40px;
    font-weight: 500;
    color: rgba(220, 220, 220, .8);
}

/* 导航栏部分 */
.nav ul li a {
    font-weight: 500;
    height: 50px;
    display: block;
    text-align: center;
    line-height: 50px;
    color: rgba(220, 220, 220, .8);
    transition-property: all;
    transition-duration: .5s;
    text-decoration: none;
}


.nav ul li a:hover {
    background-color: rgba(0, 0, 0, .5);
    color: rgba(220, 220, 220);
    box-shadow: 10px 10px 10px -4px rgba(0, 0, 0, .3);
}

.nav ul li a:active {
    box-shadow: 10px 10px 10px -4px rgba(0, 0, 0, .3) inset;
}

#last a {
    border-bottom-left-radius: 8px;
}

.bottom {
    font-size: 15px;
    text-align: center;
    width: 100%;
    height: 20px;
    position: absolute;
    bottom: 0;
    color: rgba(220, 220, 220, .6);
}

.current {
    background-color: rgba(0, 0, 0, .5);
}

.fenge{
    margin: 20px auto;
    height: 2px;
    width: 600px;
    background-color: rgba(180, 180, 180, .6);
    border-bottom-left-radius: 2px;
}