.section {
  padding: 50px 20px;
  background-color: #fff;
  margin: 40px auto;
  border-radius: 15px;
  max-width: 1200px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.section h3 {
  margin-bottom: 40px;
  text-align: center;
  font-size: 32px;
  color: #333;
  position: relative;
  padding-bottom: 15px;
  font-weight: 700;
}

.section h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 4px;
  background: linear-gradient(90deg, #ff9800, #ff5722);
  border-radius: 4px;
} 

.book-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 35px;
  padding: 20px 10px;
  animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.book {
  background-color: white;
  border-radius: 15px;
  padding: 25px;
  text-align: center;
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid #f0f0f0;
  transform-origin: center bottom;
}

.book:hover {
  transform: translateY(-15px) scale(1.02);
  box-shadow: 0 25px 35px rgba(0,0,0,0.15);
  border-color: #ff9800;
}

.book::before {
  content: '';
  position: absolute;
  top: -10px;
  right: -10px;
  width: 80px;
  height: 80px;
  background-color: #ff9800;
  opacity: 0.1;
  border-radius: 50%;
  z-index: 0;
  transition: transform 0.5s ease;
}

.book:hover::before {
  transform: scale(5);
  opacity: 0.08;
}

.book::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: -10px;
  width: 60px;
  height: 60px;
  background-color: #4CAF50;
  opacity: 0;
  border-radius: 50%;
  z-index: 0;
  transition: all 0.5s ease;
}

.book:hover::after {
  transform: scale(4);
  opacity: 0.05;
}

.book img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.book:hover img {
  transform: scale(1.08);
  box-shadow: 0 15px 25px rgba(0,0,0,0.2);
}

.book h4 {
  font-size: 18px;
  margin: 15px 0 10px;
  font-weight: 600;
  color: #333;
  line-height: 1.4;
  height: 50px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  transition: color 0.3s ease;
}

.book:hover h4 {
  color: #ff5722;
}

.book p {
  font-size: 20px;
  margin: 10px 0;
  color: #ff5722;
  font-weight: bold;
  transition: transform 0.3s ease;
}

.book:hover p {
  transform: scale(1.1);
}

.old-price {
  text-decoration: line-through;
  color: #999;
  font-size: 14px;
  margin-left: 6px;
  font-weight: normal;
}

.book form {
  margin-top: auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.quantity-container {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 15px auto;
  border-radius: 50px;
  overflow: hidden;
  background: #f5f5f5;
  padding: 5px;
  max-width: 150px;
  transition: all 0.3s ease;
  border: 1px solid #eee;
  box-shadow: 0 3px 8px rgba(0,0,0,0.05);
}

.book:hover .quantity-container {
  background: #fff3e0;
  box-shadow: 0 5px 15px rgba(255, 152, 0, 0.2);
  border-color: #ffcc80;
}

.book input[type="number"] {
  width: 45px;
  text-align: center;
  border: none;
  background: transparent;
  font-size: 16px;
  font-weight: bold;
  color: #333;
  padding: 8px 0;
  -moz-appearance: textfield;
  transition: all 0.3s ease;
}

.book:hover input[type="number"] {
  color: #ff5722;
}

.book input[type="number"]::-webkit-outer-spin-button,
.book input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.quantity-btn {
  width: 35px;
  height: 35px;
  border: none;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  color: #666;
  font-size: 14px;
  border-radius: 50%;
}

.quantity-btn:hover {
  background-color: rgba(255, 152, 0, 0.2);
  color: #ff5722;
  transform: scale(1.1);
}

.quantity-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle, rgba(255,152,0,0.2) 0%, rgba(255,152,0,0) 70%);
  opacity: 0;
  border-radius: 50%;
  transform: scale(0);
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.quantity-btn:active::before {
  transform: scale(3);
  opacity: 1;
}

.decrease-btn {
  margin-right: 5px;
}

.increase-btn {
  margin-left: 5px;
}

.book button.add_button {
  background: linear-gradient(135deg, #ff9800, #ff5722);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 50px;
  font-weight: bold;
  cursor: pointer;
  margin-top: 15px;
  width: 100%;
  transition: all 0.4s ease;
  box-shadow: 0 4px 10px rgba(255, 87, 34, 0.2);
  font-size: 16px;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.book button.add_button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.book button.add_button:hover {
  background: linear-gradient(135deg, #f57c00, #e64a19);
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(255, 87, 34, 0.3);
}

.book button.add_button:hover::before {
  transform: translateX(100%);
}

.book button.add_button:active {
  transform: translateY(0);
  box-shadow: 0 4px 8px rgba(255, 87, 34, 0.2);
}

.auth-buttons button {
  padding: 10px 20px;
  border-radius: 50px;
  border: none;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-left: 10px;
  background: transparent;
}

.auth-buttons button.login {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid white;
}

.auth-buttons button.login:hover {
  background-color: white;
  color: #ff9800;
  transform: translateY(-3px);
}

.auth-buttons button.register {
  background-color: white;
  color: #ff9800;
}

.auth-buttons button.register:hover {
  background-color: #f5f5f5;
  transform: translateY(-3px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}


@media (max-width: 992px) {
  .featured-container {
    flex-direction: column;
  }
  
  .featured-text {
    max-width: 100%;
    margin-bottom: 30px;
    text-align: center;
  }
  
  .featured-image {
    width: 80%;
  }
}

@media (max-width: 768px) {
  .category-container {
    justify-content: space-between;
    padding: 0 20px;
  }
  
  .footer-content {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}


Popup nhỏ hiện khi ấn icon 👤
.user-popup {
      display: none;
      position: absolute;
      top: 50px;
      right: 10px;
      background: white;
      border: 1px solid #ccc;
      padding: 10px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.2);
      border-radius: 4px;
      z-index: 1000;
}

.user-popup button {
      display: block;
      width: 100%;
      margin-bottom: 8px;
      padding: 8px;
      background-color: #4CAF50;
      border: none;
      color: white;
      cursor: pointer;
      font-weight: bold;
      border-radius: 4px;
}

.user-popup button.register {
      background-color: #2196F3;
}

    /* Đặt vị trí và style cho icons container để tiện popup */
.icons {
      position: relative;
}

.banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #fff3e0;
  padding: 40px 20px;
  border-radius: 12px;
  margin: 20px auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.banner .text {
  max-width: 55%;
}

.banner h2 {
  font-size: 32px;
  margin-bottom: 10px;
}

.banner p {
  font-size: 16px;
  color: #555;
  line-height: 1.6;
}

.banner button {
  background-color: #ff9800;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  color: white;
  transition: background-color 0.3s ease;
}

.banner button:hover {
  background-color: #f57c00;
}

.banner img {
  max-width: 35%;
  height: auto;
  border-radius: 8px;
}

/* Cart styles */
.cart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.cart-item {
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 15px;
  background-color: #fff7eb;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease-in-out;
}

.cart-item:hover {
  transform: translateY(-4px);
}

.cart-item h3 {
  margin-top: 0;
  font-size: 1.1rem;
  color: #333;
}

.cart-item p {
  margin: 5px 0;
  font-size: 0.95rem;
}

.cart-summary {
  margin-top: 30px;
  text-align: right;
  font-size: 1.1rem;
}

.checkout-btn {
  background-color: #ff66a3;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}

.checkout-btn:hover {
  background-color: #ff4d94;
}

.logo-button {
  background: none;
  border: none;
  font-size: 28px;        /* Tăng kích thước chữ */
  font-weight: bold;
  cursor: pointer;
  color: #000;
  font-family: 'Roboto', sans-serif;
  padding: 5px 10px;      /* Thêm padding để nút trông lớn hơn */
}

.logo-button:hover {
  text-decoration: underline;
}

/* Hiệu ứng pulse khi thay đổi số lượng */
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@keyframes increase {
  0% { color: #333; }
  50% { color: #4CAF50; }
  100% { color: #333; }
}

@keyframes decrease {
  0% { color: #333; }
  50% { color: #f44336; }
  100% { color: #333; }
}

.book input[type="number"].pulse {
  animation: pulse 0.3s ease-in-out;
}

.book input[type="number"].increase {
  animation: increase 0.3s ease-in-out;
}

.book input[type="number"].decrease {
  animation: decrease 0.3s ease-in-out;
}

/* Thêm hiệu ứng hover */
.book.hovered {
  transform: translateY(-15px);
  box-shadow: 0 20px 30px rgba(0,0,0,0.15);
  border-color: #ff9800;
}

/* Hiệu ứng cho nút thêm vào giỏ hàng */
.book button.add_button i {
  margin-right: 5px;
  transition: transform 0.3s ease;
}

.book button.add_button:hover i {
  transform: translateX(-3px);
}


/* Categories bar */
.categories-bar {
  background-color: white;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  padding: 15px 0;
  margin-top: 30px;
}

.category-container {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
  gap: 5px;
}

.category-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 15px;
  border-radius: 8px;
  color: #555;
  text-decoration: none;
  transition: all 0.3s ease;
  min-width: 80px;
}

.category-item:hover {
  background-color: #fff3e0;
  color: #ff5722;
  transform: translateY(-3px);
}

.category-item i {
  font-size: 20px;
  margin-bottom: 8px;
  color: #ff9800;
}

.category-item span {
  font-size: 14px;
  font-weight: 500;
}

/* Badge styles for slides and products */
.badge {
  display: inline-block;
  padding: 5px 12px;
  background-color: #ff5722;
  color: white;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
  box-shadow: 0 3px 8px rgba(255, 87, 34, 0.3);
}

.book-badges {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 5;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.discount-badge {
  background-color: #ff5722;
  color: white;
  padding: 5px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: bold;
  box-shadow: 0 3px 8px rgba(255, 87, 34, 0.3);
}

.new-badge {
  background-color: #4CAF50;
  color: white;
  padding: 5px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: bold;
  box-shadow: 0 3px 8px rgba(76, 175, 80, 0.3);
}

/* Book info layout */
.book-info {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.author {
  font-size: 14px;
  color: #777;
  margin: 5px 0 10px;
  font-style: italic;
}

.price-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.rating {
  display: flex;
  align-items: center;
  background-color: #fff3e0;
  padding: 3px 8px;
  border-radius: 20px;
  font-size: 12px;
  color: #ff9800;
}

.rating i {
  font-size: 12px;
  margin-right: 3px;
  color: #ff9800;
}

/* Featured section */
.featured-section {
  background-color: #fff3e0;
  padding: 50px 20px;
  margin: 40px 0;
}

.featured-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.featured-text {
  max-width: 50%;
}

.featured-text h2 {
  font-size: 36px;
  color: #333;
  margin-bottom: 15px;
  font-weight: 700;
}

.featured-text p {
  font-size: 16px;
  color: #666;
  margin-bottom: 25px;
  line-height: 1.6;
}

.btn-explore {
  display: inline-flex;
  align-items: center;
  padding: 12px 25px;
  background: linear-gradient(135deg, #ff9800, #ff5722);
  color: white;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  box-shadow: 0 5px 15px rgba(255, 87, 34, 0.3);
  transition: all 0.3s ease;
}

.btn-explore i {
  margin-left: 8px;
  transition: transform 0.3s ease;
}

.btn-explore:hover {
  background: linear-gradient(135deg, #f57c00, #e64a19);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(255, 87, 34, 0.4);
}

.btn-explore:hover i {
  transform: translateX(5px);
}

.featured-image {
  width: 45%;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.featured-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

.featured-image:hover img {
  transform: scale(1.05);
}