.nav{position:fixed;top:0;left:0;right:0;z-index:900;background:#FAF5EE;box-sizing:border-box}.bar{position:relative;display:flex;align-items:center;justify-content:center;box-sizing:border-box}.title{font-size:32rpx;font-weight:600;color:#352E2A;white-space:nowrap}.back{position:absolute;left:20rpx;top:0;bottom:0;width:80rpx;display:flex;align-items:center;justify-content:center}.back image{width:36rpx;height:36rpx}