body {
  font-family: Arial, sans-serif;
  background-color: #f7f7f7;
  padding: 20px;
}
.calculator-box {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  max-width: 600px;
  margin: 0 auto;
  padding: 30px;
}
h2 {
  color: #5a2ca0;
}
select {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  border-radius: 6px;
  border: 1px solid #ccc;
}
.result-box {
  background-color: #eee6f9;
  padding: 20px;
  margin-top: 20px;
  border-radius: 10px;
  font-size: 16px;
  line-height: 2;
  color: #333;
  white-space: pre-line;
}
.toggle-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}
.toggle-buttons button {
  width: 48%;
  padding: 10px;
  background-color: #eee;
  border: 1px solid #ccc;
  border-radius: 6px;
  cursor: pointer;
}
.toggle-buttons button.active {
  background-color: #5a2ca0;
  color: white;
}