:root{font-family:PingFang SC,Helvetica Neue,Helvetica,Arial,sans-serif;color:#0f172a;background:#f4f7fb}html,body,#root{margin:0;min-height:100%;background:radial-gradient(circle at top right,rgba(15,111,255,.12),transparent 30%),linear-gradient(180deg,#f7faff,#eef4fb)}body{min-height:100vh}*{box-sizing:border-box}.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(100%,420px);border-radius:24px;box-shadow:0 24px 60px #0f172a1f}