.nav{width: 100%;height: 55px;margin: 0;background: #cc0000}.nav .nav_list{width: 1230px;margin: auto;height: 55px;display: flex}.nav li{float: left;width: 100%;position: relative;flex: 1}.nav li.last{background: none}.nav li a{float: left;display: block;width: 100%;text-align: center;line-height: 1.2}.nav li a:hover{background: #01aeb5;text-decoration: none}.nav li a span{float: left;display: block;width: 100%;height: 55px;line-height: 55px;cursor: pointer;font-family: "Microsoft YaHei";text-align: center;color: #fff;font-size: 18px}.nav li a.selected{background: #FF9933;color: #fff}.nav li a.selected2{background: #FF9933;color: #fff}.nav li.selected .submenu{display: block}.nav li .submenu{display: none;position: absolute;top: 55px;left: 0px;background: rgba(0, 0, 0, 0.6)}.nav li .submenu{width: 100%}.nav li .submenu{z-index: 999}.nav li .submenu li{float: left;padding: 0;background: none}.nav li .submenu li a{float: none;padding: 15px 5px;box-sizing: border-box;text-align: center;font-family: "Microsoft YaHei";background: none;color: #fff}.nav li .submenu li a:hover{background: #FF9933;font-weight: normal;color: #fff;text-decoration: none}