body {
  font-family: system-ui, sans-serif;
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: white;
  margin: 0;
  padding: 0;
}

.container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

h1 {
  margin-bottom: 0;
}

.subtitle {
  opacity: 0.8;
  margin-bottom: 2rem;
}

.card {
  background: rgba(255,255,255,0.1);
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  width: 320px;
}

button {
  background: #22c55e;
  border: none;
  color: black;
  padding: 0.8rem 1.2rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 1rem;
}

button:hover {
  background: #16a34a;
}

.hidden {
  display: none;
}

#cardResult {
  margin-top: 1.5rem;
  font-size: 1.2rem;
}