body {
  font-family: Arial, sans-serif;
  background: #f9fafb;
  margin: 0;
  padding: 0;
}

.converter-container {
  max-width: 500px;
  margin: 3rem auto;
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
  text-align: center;
}

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

.input-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

select,
input {
  padding: 0.5rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 8px;
}

button {
  padding: 0.6rem;
  font-size: 1rem;
  background-color: #2563eb;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}

button:hover {
  background-color: #1e40af;
}

.result {
  margin-top: 1.5rem;
  font-weight: bold;
  color: #1f2937;
  text-align: center;
}