html,body{background:#f5f7fb;margin:0;padding:0;font-family:PingFang SC,Helvetica Neue,Arial,sans-serif}*{box-sizing:border-box}.login-shell{background:radial-gradient(circle at 0 0,#1677ff29,#0000 28%),radial-gradient(circle at 100% 100%,#52c41a1f,#0000 24%),#f5f7fb;justify-content:center;align-items:center;min-height:100vh;display:flex}