/*
* 导航
*/
.nav .item {
    width: calc(50% - 70rpx);
    margin-bottom: 20rpx;
}
.nav .item:nth-child(2n) {
    margin-right: 20rpx;
    margin-left: 10rpx;
}
.nav .item:nth-child(2n+1) {
    margin-left: 20rpx;
    margin-right: 10rpx;
}
.nav .item image {
    width: 80rpx;
    height: 80rpx;
    margin: 0 auto;
}