.book-card-wrapper:nth-child(6n+1) .book-cover {
  background: linear-gradient(135deg, #c17250 0%, #d4915e 100%);
}

.book-card-wrapper:nth-child(6n+2) .book-cover {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.book-card-wrapper:nth-child(6n+3) .book-cover {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.book-card-wrapper:nth-child(6n+4) .book-cover {
  background: linear-gradient(135deg, #e8b088 0%, #f5c99f 100%);
}

.book-card-wrapper:nth-child(6n+5) .book-cover {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.book-card-wrapper:nth-child(6n+6) .book-cover {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.book-card-wrapper .book-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  position: relative;
}

.book-card-wrapper .book-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 24px rgba(193, 114, 80, 0.2);
}

.book-actions-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.95), transparent);
  padding: 1rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.book-card:hover .book-actions-overlay {
  opacity: 1;
}

.add-book-form {
  margin: 0;
}

.btn-add-book {
  width: 100%;
  padding: 0.6rem;
  background: #ffffff;
  color: rgb(0, 0, 0);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-add-book:hover {
  background: #dcdada;
  transform: translateY(-2px);
}