:root{
  --bg1:#0f172a;
  --bg2:#0b1220;
  --card:#0b1228;
  --accent:#7c3aed;
  --muted:#9aa4b2;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial}
body{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--bg1),var(--bg2));color:#e6eef8}
.card{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:2.5rem;border-radius:14px;max-width:520px;width:90%;box-shadow:0 8px 30px rgba(2,6,23,0.7);text-align:center;border:1px solid rgba(255,255,255,0.04)}
.card h1{margin:0 0 .5rem;font-size:2rem}
.lead{color:var(--muted);margin:0 0 1.25rem}
button{background:linear-gradient(90deg,var(--accent),#4f46e5);color:white;border:none;padding:.7rem 1.1rem;border-radius:10px;font-weight:600;cursor:pointer;box-shadow:0 6px 18px rgba(124,58,237,0.24)}
button:active{transform:translateY(1px)}
#message{margin-top:1rem;font-size:1.05rem}
.foot{margin-top:1.5rem;font-size:.85rem;color:var(--muted)}
@media (prefers-reduced-motion: no-preference){
  button{transition:transform .15s ease, box-shadow .15s ease}
}
@media (max-width:420px){.card{padding:1.5rem}.card h1{font-size:1.5rem}}