.bookshelf-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 1rem;
}

.book-card {
  display: flex;
  gap: 14px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 10px;
  border-radius: 5px;
  background: #fff;
}

.book-cover {
  width: 100px;
  height: 150px;
  object-fit: cover;
  flex-shrink: 0;
}

.book-title {
  margin: 0 0 5px 0;
  font-size: 1.1em;
}

.book-author {
  margin: 0;
  color: #555;
  font-size: 0.9em;
  font-style: italic;
}

.book-meta {
  margin-top: 6px;
  font-size: 0.82em;
  color: #666;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.book-tag {
  background: #f5f5f5;
  border-radius: 12px;
  padding: 2px 8px;
  line-height: 1.6;
}

.book-note {
  margin-top: 10px;
  font-size: 0.9em;
}

.sort-btn.is-active {
  background: #333;
  border-color: #333;
  color: #fff;
}

@media (max-width: 900px) {
  .bookshelf-grid {
    grid-template-columns: 1fr;
  }
}