.exp-book-calculator {
	border: 2px solid #ddd;
  padding: 25px;
  border-radius: 10px;
  background: #fff;
  max-width: 480px;
  margin: 0 auto;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.hec-heading {
  margin-top: 0;
  font-size: 22px;
  padding-bottom: 6px;
  border-bottom: 2px solid #eee;
  margin-bottom: 20px;
  color: #222;
}

.exp-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.exp-row label {
    font-weight: bold;
    text-align: left;
}

.exp-row input {
    width: 100px;
    padding: 6px;
    font-size: 16px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

.result {
    margin-top: 10px;
    font-weight: bold;
}