body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f0f8ff;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 500px;
  margin: 0 auto;
  padding: 20px;
  background: #fff;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.1);
  border-radius: 12px;
  margin-top: 30px;
}

h1, h3, p {
  text-align: center;
}

button {
  display: block;
  margin: 10px auto;
  padding: 10px 20px;
  font-size: 18px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

#result {
  font-size: 20px;
  color: green;
  margin-top: 10px;
  text-align: center;
}

.hidden {
  display: none;
}

#bottomAd {
  position: sticky;
  bottom: 0;
  width: 100%;
  background: #ddd;
  text-align: center;
  padding: 10px;
  font-size: 14px;
}