body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
}

#app {
  background: white;
  border-radius: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  padding: 30px;
  width: 100%;
  max-width: 400px;
}

h1 {
  text-align: center;
  font-weight: 600;
  margin-bottom: 20px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

label {
  font-size: 14px;
  color: #333;
}

input {
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #ddd;
  font-size: 16px;
}

button {
  background-color: #007aff;
  color: white;
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background-color: #005fcc;
}

#result {
  margin-top: 20px;
  font-size: 18px;
  text-align: center;
  color: #007aff;
  font-weight: 600;
}