body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f0f4f8;
  color: #111827;
}

.page {
  max-width: 720px;
  margin: 4rem auto;
  padding: 1.5rem;
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

button {
  padding: 0.85rem 1.2rem;
  border: none;
  border-radius: 999px;
  background: #2563eb;
  color: white;
  cursor: pointer;
  font-weight: 600;
}

button:hover {
  transform: translateY(-1px);
}

#result {
  margin-top: 1rem;
  font-size: 0.98rem;
}