body {
  font-family: "Segoe UI", Tahoma, sans-serif;
  margin: 0;
  padding: 1.5rem;
  background: #0f172a;
  color: #f8fafc;
}

.app-shell {
  max-width: 480px;
  margin: 0 auto;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

.subtitle {
  margin: 0 0 1.5rem;
  color: #94a3b8;
}

.panel {
  padding: 1.25rem;
  border-radius: 16px;
  background: #111827;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.status {
  margin: 0 0 1rem;
  color: #cbd5e1;
  line-height: 1.4;
  min-height: 2.5rem;
}

.actions {
  display: flex;
  gap: 0.75rem;
}

button {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 0;
  border-radius: 10px;
  background: #334155;
  color: white;
  cursor: pointer;
  font-size: 0.95rem;
}

button.primary {
  background: #2563eb;
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}