body {
  font-family: 'Segoe UI', sans-serif;
  background: #f4f7fb;
  color: #333;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 500px;
  margin: 80px auto;
  padding: 2rem;
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.08);
  text-align: center;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: #666;
  margin-bottom: 1.5rem;
}

input {
  width: 80%;
  padding: 0.8rem;
  font-size: 1rem;
  border: 2px solid #ccc;
  border-radius: 10px;
  margin-bottom: 1rem;
}

button {
  padding: 0.7rem 1.5rem;
  background: #4CAF50;
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
}

button:hover {
  background: #45a049;
}

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