.after{
    content: '';
    clear: both;
    display: block;
    zoom: 1;
}

body,ul,ol,div,p,li,h2,h3,h4,.qingchu2{
    list-style: none;
    margin: 0px;
    padding: 0px;

}
/* 导航栏宽度 */
header{
    width: 60px;
    height: 100%;
    position: fixed;
    top: 0px;
    left:0px;
    z-index: 300;
    text-align: center;

}
/* 顶部导航背景 */
.longo{
    position: fixed;
    top: 0px;
    left: 0px;
    width: 60px;
    height: 100%;
    z-index: 298;
    opacity: 1;
    background: rgb(169, 224, 255);
}

div{
    text-align: center;
}

.to_nav{
    height: 390px;
    width: 60px;
    margin: auto 0px;
}

.to_nav>li{
    position: relative;
    margin: 10px 0px;
    width: 60px;
    transition: transform .02s ease-out .1s;
}

.to_nav a{
    display: block;
    font-size: 14px;
    font-weight: 700;
    color: #000000;
    line-height: 50px;
    height: 50px;
    text-decoration: none;
    
}
/* 一级菜单悬浮后添加圆角 */
.to_nav li:hover{
    border-radius: 15% 0% 0px 15%;
    color: #000000;
    background: #2fceff;
    transform: scale(1.01);
    transition: transform .02s ease-out .1s;
}
/* 二级菜单初始值 */
.to_nav ul{
    position: absolute;
    top: 0px;
    left: 59px;
    width: 90px;
    height: 0px;
    opacity: 0;
    overflow: hidden;
    z-index: 299;
    border-top-right-radius: 8px;
    border-bottom-right-radius: 8px;
}
/* 鼠标在导航栏的li标签悬浮时，二级菜单展开 */
.to_nav>li:hover ul{
    height: auto;
    opacity: 1;
    background:#2fceff ;
}

.to_nav ul li{
    height: 0px;
    transition: height .25s ease .1s;
}
/* 为下拉菜单的a标签设置动画 */
.to_nav ul a{
    display: block;
    width: 90px;
    height: 40px;
    line-height: 40px;
    font-size: 14px;
    text-decoration: none;
    color:rgb(0, 0, 0);
    transition: all .05s;
    
}

.to_nav>li:hover ul li{
    height: 40px;
    background:#2fceff ;
    
}

/* 下拉菜单a标签悬浮动画 */
.to_nav>li:hover ul a:hover{
    color: rgb(255, 255, 255);
    transform: scale(1.01);
    transition: transform .02s ease-out .1s;
}

/* 下拉菜单a标签点击动画 */
.to_nav>li:hover ul a:active{
    font-size: 11px;
    line-height: 40px;
    color: rgb(25, 0, 255);
    border-top: rgb(255, 255, 255) 0.1px solid;
    transition: all .2s ease-out;

}

/* 演示框架 */
.fu{
    background-color: rgb(255, 255, 255);
    height:40%;
    width: 300px;
    opacity: 0;
    position: fixed;
    top: 0px;
    right: 0px;
    z-index: 298;

}

.fu:hover{
    height: 100%;
    width: 600px;
    opacity: 1;
    transition: all .1s linear .1s;
}

/* 背景框架 */
.background-image{
    background-color: white;
    position: fixed;
    opacity: 1;
    top: 0px;
    left: 0px;
    z-index: -1;
    width: 100%;
    height: 100%;
    
}

/* 添加外圆角 */
.before::before{
    position:absolute;
    right: 0px;
    bottom: -40px;
    content: '';
    width: 40px;
    height: 40px;
    border-radius: 100%;
    box-shadow: 0 0 0 20px transparent;
    z-index: 299;
    clip-path: inset( 0 0 50%50%);
}
.before:hover::before{
    box-shadow: 0 0 0 20px;
    color: #2fceff;
}

body,html{
    height: 100%;
}

/* 为所有属性设置页面加载时显示的动画 */
section,section div,section li,section p{
    margin-bottom: 0px;
    line-height: 33px;
    transition: all 0.2s ease-out 0.001s;
    
}

section a{
    color: #050505;
    display: block;
    transition: transform .01s linear .01s;
}
/* 设置a标签放大动画 */
section a:hover{
    color: #ffffff;
    text-decoration: underline;
    transform: scale(1.5);
    transition: transform .01s linear .01s;

}

section a:active{
    transition: all .3s;
    color: rgb(55, 0, 255);
}

section div{
    width: 800px;
    margin: 0px auto;
    background-color: rgb(152, 207, 255);
}

section iframe{
    background:white;
    width: 350px;
}

.css ul ul li{
    margin:10px auto;
    background: rgb(222, 240, 255);
    width:auto;
}

.css ul>li{
    width: 400px;
    margin:10px auto;
    padding: 10px;
    background: #ebfaff;
}

p{
    padding: 0px 50px;

}