:root {
  --primary: #0ea5e9;
  --bg: #0b1020;
  --card: #0f172a;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0,0,0,.3);
}
* { box-sizing:border-box; }
body { margin:0; font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Helvetica,Arial,sans-serif; background:var(--bg); color:var(--text); }
.app-header { display:flex; align-items:center; gap:12px; padding:20px; background:linear-gradient(120deg, #0ea5e9 0%, #6366f1 100%); color:#fff; }
.logo { width:40px; height:40px; border-radius:12px; }
.badge { background:rgba(255,255,255,.2); padding:4px 10px; border-radius:999px; font-size:12px; }
.container { max-width:900px; margin:24px auto; padding:0 16px; }
.btn { background:var(--primary); color:#001; border:0; padding:12px 16px; border-radius:12px; font-weight:700; cursor:pointer; box-shadow:var(--shadow); }
.btn:hover { filter:brightness(1.1); }
.card { background:var(--card); border-radius:var(--radius); padding:20px; box-shadow:var(--shadow); margin-top:16px; }
.footer { padding:16px; text-align:center; color:var(--muted); }
@media (display-mode: standalone) {
  .badge { display:inline-flex; }
}