body {
  font-family: Arial, sans-serif;
  background: #f8f9fa;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

.container {
  background: #fff;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  width: 320px;
  text-align: center;
}

label {
  display: block;
  margin-top: 1rem;
  text-align: left;
}

input {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  border-radius: 6px;
  border: 1px solid #ddd;
}

button {
  margin-top: 1.5rem;
  padding: 10px;
  width: 100%;
  background: #0070f3;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #0059c9;
}

.hidden {
  display: none;
}

#result {
  margin-top: 1.5rem;
  background: #f1f5f9;
  padding: 1rem;
  border-radius: 6px;
}