header{color:#fff;background:#222}
.catalog{color:#333;width:100%;overflow:hidden;background:#fff;position:relative}
.catalog .catalog-title{float:left;font-size:.875rem;color:#1abc9c;width:100%;padding:0 1rem;border-bottom:1px solid #1abc9c;box-sizing:border-box}
.catalog .catalog-title select{position:absolute;left:.9375rem;top:0;height:2.8125rem;font-size:.875rem;color:#1abc9c;overflow:hidden;opacity:0;z-index:10}
.catalog .catalog-title .left{float:left;height:2.75rem;line-height:2.75rem}
.catalog .catalog-title .left .icon{width:.75rem;height:.75rem;padding:1rem .3125rem;-webkit-transition:-webkit-transform .25s;transition:transform .25s;-webkit-transform:rotate(90deg);transform:rotate(90deg);vertical-align:middle;fill:currentColor}
.catalog .catalog-title .right{float:right;height:2.75rem;line-height:2.75rem}
.catalog ul{float:left;width:100%}
.catalog ul li p{font-size:.875rem;padding:.8125rem 1rem;border-bottom:1px dashed #e7e7e7}
.catalog ul li p span{display:inline-block;width:2.5rem}
.catalog ul li p.cur{color:#1abc9c}
.catalog .chapter_page{font-size:.875rem;color:#1abc9c}
.catalog .chapter_page .left{float:left;width:30%;height:4rem;line-height:4rem;padding-left:1rem;text-align:left;box-sizing:border-box}
.catalog .chapter_page .center{float:left;width:40%;height:4rem;line-height:4rem;text-align:center;position:relative}
.catalog .chapter_page .center select{position:absolute;top:0;height:3.5rem;font-size:.875rem;color:#1abc9c;overflow:hidden;opacity:0;z-index:10}
.catalog .chapter_page .right{float:right;width:30%;height:4rem;line-height:4rem;padding-right:1rem;text-align:right;box-sizing:border-box}
.catalog .chapter_page a{color:#fff;text-align:center;font-size:.875rem;padding:.5rem 1rem;border-radius:.3125rem;background-color:#1abc9c;-webkit-border-radius:.3125rem}
.catalog .chapter_page .center .icon{width:.75rem;height:.75rem;padding:0 .125rem;-webkit-transition:-webkit-transform .25s;transition:transform .25s;-webkit-transform:rotate(90deg);transform:rotate(90deg);vertical-align:middle;fill:currentColor}
.catalog .chapter_page .opacity{opacity:.5}