:root{--bg: #0f1218;--card: #171c25;--border: #262d3a;--text: #e6eaf2;--muted: #8b94a7;--accent: #4f8cff}*{box-sizing:border-box}html,body{margin:0;padding:0;min-height:100%}body{background:radial-gradient(1200px 600px at 50% -10%,#1a2230 0%,var(--bg) 60%);color:var(--text);font-family:system-ui,-apple-system,PingFang SC,Microsoft YaHei,sans-serif;-webkit-font-smoothing:antialiased}.shell{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:24px;padding:24px}.card{width:100%;max-width:460px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:32px 28px;text-align:center;box-shadow:0 10px 40px #00000059}.badge{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:12px;color:var(--accent);background:#4f8cff1f;border:1px solid rgba(79,140,255,.25);margin-bottom:16px}h1{margin:0 0 12px;font-size:20px;font-weight:600;letter-spacing:.02em}.desc{margin:0 0 10px;color:var(--muted);font-size:14px;line-height:1.7}.hint{margin:0;color:var(--muted);font-size:12px;opacity:.8}.foot{color:var(--muted);font-size:12px;letter-spacing:.06em}@media (max-width: 480px){.card{padding:24px 18px;border-radius:12px}h1{font-size:18px}}