.open_why{padding-bottom:180px}.open_why .open_title{margin-bottom:56px}.open_why .q_item .a{margin-top:0;max-height:0;overflow:hidden;transition:max-height .3s ease}.open_why .q_item .a p:first-child{padding-top:34px}.open_why .q_item.active .a{max-height:200px}.open_why br.m{display:none}@media (max-width:966px){.open_why{padding-bottom:80px}.open_why br.m{display:block}.open_why .open_title{margin-bottom:36px}.open_why .q_item .a{font-size:16px}.open_why .q_item.active .a{max-height:400px}.open_why .q_item .a p:first-child{padding-top:14px}}