* {margin: 0; padding: 0;}
.tree {width: 230%;}

.tree ul { padding-top: 20px; position: relative; transition: all 0.5s; -webkit-transition: all 0.5s; -moz-transition: all 0.5s; }

.tree li { float: left; text-align: center; list-style-type: none; position: relative; padding: 20px 5px 0 5px; transition: all 0.5s; -webkit-transition: all 0.5s; -moz-transition: all 0.5s; }

/*We will use ::before and ::after to draw the connectors*/

.tree li::before, .tree li::after{ content: ''; position: absolute; top: 0; right: 50%; border-top: 1px solid #ccc; width: 50%; height: 20px; }
.tree li::after{ right: auto; left: 50%; border-left: 1px solid #ccc; }

/*We need to remove left-right connectors from elements without any siblings*/
.tree li:only-child::after, .tree li:only-child::before { display: none; }

/*Remove space from the top of single children*/
.tree li:only-child{ padding-top: 0;}

/*Remove left connector from first child and right connector from last child*/
.tree li:first-child::before, .tree li:last-child::after{ border: 0 none; }
/*Adding back the vertical connector to the last nodes*/
.tree li:last-child::before{ border-right: 1px solid #ccc; border-radius: 0 5px 0 0; -webkit-border-radius: 0 5px 0 0; -moz-border-radius: 0 5px 0 0; }
.tree li:first-child::after{ border-radius: 5px 0 0 0; -webkit-border-radius: 5px 0 0 0; -moz-border-radius: 5px 0 0 0; }

/*Time to add downward connectors from parents*/
.tree ul ul::before{ content: ''; position: absolute; top: 0; left: 50%; border-left: 1px solid #ccc; width: 0; height: 20px; }

.tree li a{ background: #e9e7e7;border: 1px solid #ccc; padding: 5px 10px; text-decoration: none; color: #101010; font-family: arial, verdana, tahoma; font-size: 11px; display: inline-block; border-radius: 5px; -webkit-border-radius: 5px; -moz-border-radius: 5px; transition: all 0.5s; -webkit-transition: all 0.5s; -moz-transition: all 0.5s; }

/*Time for some hover effects*/
/*We will apply the hover effect the the lineage of the element also*/
.tree li a:hover, .tree li a:hover+ul li a { background: #c8e4f8; color: #000; border: 1px solid #94a0b4; }
/*Connector styles on hover*/
.tree li a:hover+ul li::after,
.tree li a:hover+ul li::before,
.tree li a:hover+ul::before,
.tree li a:hover+ul ul::before{ border-color: #94a0b4; }
span[data-descr] {
    position: relative;
    text-decoration: underline;
    color: #00f;
    cursor: help;
}

span[data-descr]:hover::after {
    content: attr(data-descr);
    position: absolute;
    left: 0;
    top: 24px;
    min-width: 200px;
    border: 1px #aaaaaa solid;
    border-radius: 10px;
    background-color: #ffffcc;
    padding: 12px;
    color: #000000;
    font-size: 14px;
    z-index: 1;
}
#tctc{    
    display: none; /* 默认隐藏 */
    position: fixed; /* 固定定位 */
    z-index: 1; /* 设置在顶层 */
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%;
    overflow: auto; 
    background-color: rgb(0,0,0); 
    background-color: rgba(0,0,0,0.4); 
}
/* 弹窗内容 */
.modal-content {
    text-align: center;
    background-image: linear-gradient(to right, #eddd1c,#5c0334);
    margin: 15% auto; 
    padding: 20px;
    border: 0px solid #888;
    width: 80%; 
}
strong{
    background-image: -webkit-linear-gradient(bottom,red,#fd8403,yellow);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}