.book-calculator {
  max-width: 500px;
  margin: 0 auto;
  padding: 2rem;
  font-family: 'Segoe UI', sans-serif;
  background-color: #f9f9f9;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.book-calculator h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.book-calculator label {
  display: block;
  margin: 0.75rem 0 0.25rem;
  font-weight: 500;
}
.book-calculator textarea,
.book-calculator input,
.book-calculator select {
  width: 100%;
  padding: 0.5rem;
  font-size: 1rem;
  margin-bottom: 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
}
.book-calculator button {
  background-color: #2c3e50;
  color: white;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
.book-calculator .quote {
  margin-top: 1.5rem;
  font-size: 1.25rem;
  font-weight: 600;
}
.book-calculator .quote-sub {
  margin-top: 1.5rem;
  font-size: 1.25rem;
}