body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #8595df, #a772dd);
  font-family: Arial, sans-serif;
}

.card {
  background: white;
  padding: 30px;
  border-radius: 15px;
  text-align: center;
  width: 320px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

h1 {
  margin-bottom: 20px;
}

input {
  width: 80%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

button {
  margin-top: 15px;
  padding: 10px 15px;
  border: none;
  border-radius: 8px;
  background: #667eea;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #5a67d8;
}

#result {
  margin-top: 20px;
}

.hidden {
  display: none;
}