body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f5f5f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.calc-container {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  text-align: center;
  max-width: 320px;
  width: 100%;
}

.inputs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  justify-content: center;
}

input[type="number"] {
  width: 80px;
  padding: 0.4rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

select {
  padding: 0.4rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  padding: 0.5rem 1rem;
  background: #0069d9;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #0053a6;
}

.result {
  margin-top: 1rem;
  font-weight: bold;
  font-size: 1.2rem;
}