body {
  font-family: Arial, sans-serif;
  background: #111;
  color: #f5f5f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  text-align: center;
  background: #1e1e1e;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(255,255,255,0.1);
}

h1 {
  color: #ffd700;
}

input {
  display: block;
  width: 100%;
  padding: 0.5rem;
  margin: 0.5rem 0;
  border-radius: 8px;
  border: none;
}

button {
  background: #ffd700;
  color: #000;
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  margin: 0.5rem;
}

button:hover {
  background: #ffcc00;
}

#result {
  margin-top: 1rem;
  font-size: 1.2rem;
}

.subscription {
  margin-top: 2rem;
  background: #222;
  padding: 1rem;
  border-radius: 8px;
}