.calculator-container {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  max-width: 500px;
  margin: 20px auto;
}
label {
  display: block;
  margin-top: 15px;
  font-weight: bold;
}
input, select, button {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  border-radius: 5px;
  border: 1px solid #ccc;
}
button {
  background-color: #28a745;
  color: #fff;
  border: none;
  margin-top: 20px;
  cursor: pointer;
}
.results {
  margin-top: 20px;
  background-color: #f1f9f4;
  padding: 15px;
  border-radius: 8px;
}