body {
  font-family: 'Pretendard', sans-serif;
  font-weight: 300; /* ✅ 기본적으로 얇은 글씨(Light) */
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
}

.library-container {
  width: 80%;
  margin: 40px auto;
}

.library-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1, h2, h3 {
  font-weight: 400; /* ✅ 제목(Regular) */
}

h1 {
  font-size: 2.2rem;
}

h2 {
  font-size: 1.2rem;
}

h3 {
  font-size: 1.2rem;
}

#write-review-btn {
  font-family: 'Pretendard', sans-serif;
  font-size: 16px;
  font-weight: 300; /* ✅ 버튼은 Light */
  color: #555;
  background: none;
  border: none;
  cursor: pointer;
}

#write-review-btn:hover {
  text-decoration: underline;
}

.book-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.book-card {
  background: white;
  padding: 10px;
  border-radius: 8px;
  box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  transition: transform 0.2s;
}

.book-card:hover {
  transform: scale(1.05);
}

.book-cover {
  width: 100%;
  height: 240px;
  background-size: cover;
  background-position: center;
  border-radius: 5px;
}

.book-info {
  padding: 10px;
  text-align: left;
}

.book-info h3 {
  font-size: 1rem;
  font-weight: 400; /* ✅ 책 제목도 Regular */
  margin: 5px 0;
}

.rating {
  color: #ffcc00;
  font-weight: 300; /* ✅ 별점은 Light */
}

.review {
  font-size: 0.9rem;
  font-weight: 300; /* ✅ 리뷰 요약도 Light */
  color: #555;
  margin-top: 5px;
}

.no-books-message {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 300; /* ✅ "더 이상 책이 없습니다" 문구도 Light */
  color: #888;
  margin-top: 20px;
}