.header{background:#fff}.header .container{height:110px;display:flex;justify-content:space-between;align-items:center}.site-logo img{width:auto;height:70px}.kf-phone_ic{margin:0 0 0 10px;position:relative;bottom:1px}.kf-phone{padding:5px 10px 5px 0;margin-right:10px}.nav-section{margin-top:16px;display:flex;justify-content:flex-end}.nav-section a{margin:0 10px;padding:5px 10px;font-size:16px;font-weight:400}.banner{width:100%;height:660px;background-color:#ff7b07;display:flex;flex-direction:column}.banner-title{margin:100px auto 40px;font-size:51px;font-weight:700;letter-spacing:20px;color:#fff}.banner-subtitle{margin:0 auto 80px;font-size:26px;letter-spacing:2px;color:#fff}.down-btns{display:flex;justify-content:space-between}.down-btn{width:197px;height:56px;background-color:#fff;color:#ff7b07;border-radius:6px;display:flex;justify-content:center;align-items:center;position:relative}.down-btn:hover{cursor:pointer}.down-btn img{height:24px;width:auto;margin-right:10px}.down-btn_layer{display:none;position:absolute;top:68px;width:197px;height:197px;background-color:#fff;border-radius:6px;text-align:center}.down-btn_layer img{display:block;width:150px;height:150px;margin:10px auto 4px}.down-btn_layer div{color:#333}.brief-item{padding:130px 0;background-color:#fff}.brief-item .container{display:flex}.brief-item_cell{flex:1}.brief-item_cell img{width:540px;height:auto}.brief-item_title{margin-top:40px;font-size:40px;padding:10px 0;font-weight:400}.brief-item_desc{font-size:14px;padding:10px 110px 10px 0;font-weight:400}