/* Reset cơ bản */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

/* Header */
header {
  text-align: center;
  background-color: #4a90e2;
  color: white;
  padding-bottom: 10px;
}

.banner {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  background-color: #357ABD;
  padding: 10px;
}

nav ul li {
  margin: 0 15px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

nav ul li a:hover {
  text-decoration: underline;
}

/* Form mượn sách */
.borrow-section {
  width: 80%;
  margin: 30px auto;
  background-color: #f9f9f9;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

form input, form button {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

form button {
  background-color: #4a90e2;
  color: white;
  cursor: pointer;
  transition: 0.3s;
}

form button:hover {
  background-color: #357ABD;
}

/* Khu vực sách gần đây */
.recent-books {
  width: 90%;
  margin: 30px auto;
  text-align: center;
}

.book-slider {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.book-grid {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 10px;
  scroll-snap-type: x mandatory;
}

.book-item {
  flex: 0 0 200px;
  background-color: white;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 10px;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  scroll-snap-align: start;
}

.book-item img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 8px;
}

.book-item button {
  background-color: #4a90e2;
  color: white;
  border: none;
  border-radius: 5px;
  padding: 8px;
  margin-top: 8px;
  cursor: pointer;
}

.book-item button:hover {
  background-color: #357ABD;
}

/* Nút trượt trái/phải */
.slide-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0,0,0,0.5);
  color: white;
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  z-index: 10; /* Giúp nút nằm trên ảnh */
  font-size: 20px;
  transition: 0.3s;
}

.slide-btn:hover {
  background-color: rgba(0,0,0,0.8);
}

.slide-btn.left {
  left: 10px;
}

.slide-btn.right {
  right: 10px;
}

/* Footer */
footer {
  background-color: #4a90e2;
  color: white;
  text-align: center;
  padding: 15px;
  margin-top: 30px;
}