/* Simple centered layout */
html, body {
  height: 100%;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  text-align: center;
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.primary {
  background: #0066ff;
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
}

.primary:hover {
  background: #0052cc;
}

.result {
  margin-top: 1.5rem;
  font-size: 2rem;
}