/* Bộ lọc thể loại */
.qbm-filter {
    margin-bottom: 20px;
    font-size: 16px;
}
.qbm-filter select {
    padding: 6px 10px;
    font-size: 14px;
}

/* Lưới hiển thị sách */
#qbm-books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 5px;
	align-content: center;
    justify-content: center;
    align-items: start;
}

/* Thẻ sách */
.qbm-book {
  width: 200px;
  border: 1px solid #ccc;
  border-radius: 1px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  padding: 10px;
  background-color: #fff;
  text-align: center;
  transition: transform 0.3s ease;
}
.qbm-book:hover {
    transform: scale(1.02);
}
.qbm-book img {
  width: 100%;
  height: auto;
  max-height: 230px;
  object-fit: contain;
  display: block;
  margin-bottom: 8px;
}
.qbm-book h3 {
    font-size: 18px;
    margin: 8px 0 4px;
    color: #0073aa;
}
.qbm-book p {
    font-size: 14px;
    color: #555;
    margin-bottom: 10px;
}
.qbm-book button {
    margin: 2px;
    padding: 8px 12px;
    background-color: #0073aa;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
}
.qbm-book button:hover {
    background-color: #005177;
}

/* Popup overlay với hiệu ứng blur */
#qbm-popup-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Popup box */
#qbm-popup-box {
    background: #fff;
    padding: 30px;
    max-width: 600px;
    width: 90%;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0,0,0,0.3);
    position: relative;
    animation: fadeIn 0.3s ease-in-out;
    max-height: 80vh;
    overflow-y: auto;
}

/* Nội dung popup */
#qbm-popup-box h2 {
    margin-top: 0;
    font-size: 24px;
    color: #0073aa;
}
#qbm-popup-desc-container {
    position: relative;
}
#qbm-popup-desc {
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    max-height: 200px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
#qbm-popup-desc.expanded {
    max-height: none;
}

/* Nút Đọc thêm */
#qbm-read-more {
    margin-top: 10px;
    background-color: #0073aa;
    color: white;
    border: none;
    padding: 6px 12px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
}

/* Nút Mua Trên Shopee */
#qbm-buy-button {
    display: inline-block;
    background-color: #ff5722;
    color: white;
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 14px;
    margin-top: 15px;
}
#qbm-buy-button:hover {
    background-color: #e64a19;
}

/* Nút đóng popup */
#qbm-popup-close {
    position: absolute;
    top: 10px; right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: #999;
}
#qbm-popup-close:hover {
    color: #333;
}

/* Hiệu ứng popup */
@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}