body {
            margin: 0;
            font-family: Arial, sans-serif;
            background-color: #f8f8f8;
        }
        header {
            background-color: #044b91;
            color: white;
            padding: 10px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        header h1 {
            font-size: 1.5rem;
            margin: 0;
        }
        nav {
            background-color: #003366;
            display: flex;
            justify-content: center;
            padding: 10px;
        }
        nav ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            gap: 20px;
        }
        nav ul li {
            position: relative;
        }
        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: bold;
            padding: 5px 10px;
        }
        nav ul li ul {
            display: none;
            position: absolute;
            top: 30px;
            left: 0;
            background: white;
            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
            list-style: none;
            padding: 0;
            margin: 0;
            min-width: 150px;
        }
        nav ul li ul li a {
            color: black;
            display: block;
            padding: 10px;
        }
        nav ul li:hover ul {
            display: block;
        }
        .container {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 20px;
            padding: 20px;
        }
        .banner {

            padding: 5px;
            border-radius: 5px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        }


           




























        
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .card {
            background: white;
            padding: 15px;
            border-radius: 10px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        footer {
            background-color: #003366;
            color: white;
            font-size: 14px;
            line-height: 1.5;
            padding: 14px 16px;
        }
        
        footer img {
            height: 60px;          
            display: block;
            margin: 0 auto 8px auto; 
        }
        
        footer p {
            margin: 4px 0;
            text-align: center;     
        }
        
        
        footer .copyright {
            display: block;
            background-color: #07283a; 
            font-size: 12px;
            padding: 6px 0;
            margin-top: 10px;
            text-align: center;
        }
        /* --- Phần mạng xã hội --- */
.social-section {
  text-align: center;
  margin-top: 10px;
}

.social-section p {
  font-size: 14px;
  margin-bottom: 6px;
}

.social-icons {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.social-icons a {
  width: 35px;
  height: 35px;
  border-radius: 50%;
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all 0.3s ease;
}

.social-icons a i {
  color: #003366;
  font-size: 16px;
}

.social-icons a:hover {
  background-color: #ffcc00; /* Màu vàng nhẹ khi hover */
  transform: scale(1.1);
}

        header {
            background-color: #004080;
            color: white;
            padding: 10px 20px;
        
            display: flex;              
            align-items: center;        
            justify-content: space-between;
        }
        
        header .logo-wrapper {
            display: flex;
            align-items: center;
            gap: 10px; 
        }
        
        header img {
            height: 40px; 
            display: block;
        }
        
        .sach-moi-container {
            max-width: 100%;
            margin: 0 auto;
            padding: 20px;
          }
          
          .sach-moi h2 {
            text-align: left;
            font-size: 1.5rem;
            margin-bottom: 10px;
            border-left: 4px solid orange;
            padding-left: 8px;
          }
          
          .bang-sach {
            display: flex;
            gap: 16px;
            overflow-x: auto;
            scroll-behavior: smooth;
            padding-bottom: 10px;
            scrollbar-width: none; 
          }
          
          .bang-sach::-webkit-scrollbar {
            display: none; 
          }
          
          .sach-item {
            min-width: 140px; 
            text-align: center;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            padding: 10px;
            transition: transform 0.2s;
          }
          
          .sach-item:hover {
            transform: scale(1.05);
          }
          
          .sach-item img {
            width: 100%;
            border-radius: 4px;
          }
          
          .sach-item p {
            margin-top: 8px;
            font-size: 0.9rem;
            font-weight: bold;
          }
          
        
   
          .sach-item p a {
            text-decoration: none; 
            color: black; 
          }
          
          .sach-item p a:hover {
            text-decoration: underline; 
            color: #040a0f; 
          }
          .khung-trang {
            background-color: white;
            padding: 20px;
            margin: 20px auto;
            max-width: 800px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
          }
          
          .sach-layout {
            display: flex;
            align-items: flex-start; 
            gap: 20px; 
          }
          
          .sach-layout img {
            max-width: 250px; 
            height: auto;
            border-radius: 5px;
          }
          
          .mo-ta {
            flex: 1; 
            color: #000;
          }
          
          .mo-ta h2 {
            margin-top: 0;
            color: #000;
          }
          
          .mo-ta p {
            text-align: justify; 
            line-height: 1.6;
            color: #000;
          }
          
        

        
nav ul li ul {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: #0a4b91;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  list-style: none;
  padding: 0;
  margin: 0;
  min-width: 230px; 
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.25s ease; 
}

nav ul li:hover ul {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

nav ul li ul li a {
  color: white;
  display: block;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  transition: background 0.25s ease;
}

nav ul li ul li:last-child a {
  border-bottom: none;
}

nav ul li ul li a:hover {
  background: #0066cc;
  color: #fff;
  border-radius: 6px;
}




.muon-ve-nha {
  background: #fff;
  padding: 20px;
  border: 1px solid #ccc;
  max-width: 1000px;
  margin: 30px auto;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.tieu-de {
  text-align: center;
  color: red;
  font-weight: bold;
}

.mo-ta {
  text-align: center;
  color: blue;
  margin-bottom: 20px;
}

.bang-muon-sach {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
}

.bang-muon-sach th,
.bang-muon-sach td {
  border: 1px solid black;
  padding: 8px;
}

.bang-muon-sach th {
  background: #f2f2f2;
  color: blue;
  font-weight: bold;
}

.bang-muon-sach td {
  color: #0000ff;
}


.muon-doc {
  background: #fff;
  padding: 20px 40px;
  border: 1px solid #ccc;
  max-width: 1000px;
  margin: 30px auto;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.muon-doc .tieu-de {
  color: #000;
  font-weight: bold;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.muon-doc .mo-ta {
  text-align: center;
  margin-bottom: 20px;
}

.muon-doc .do {
  color: red;
}

.muon-doc .quy-dinh {
  list-style: none;
  padding: 0;
}

.muon-doc .quy-dinh li {
  color: blue;
  margin: 6px 0;
  position: relative;
}

.muon-doc .quy-dinh li::before {
  content: "- ";
  color: blue;
}

.muon-doc .quy-dinh li {
  color: blue;
  margin: 10px 0;  /* tăng khoảng cách giữa các dòng */
  position: relative;
  line-height: 1.6; /* giãn chiều cao dòng */
}



/* Khung chứa slider */
.slider {
  position: relative;
  width: 100%;
  max-width: 1000px;
  height: 400px;
  margin: 30px auto;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Ảnh trong slider */
.slides {
  display: flex;
  width: 300%; /* nếu có 3 ảnh */
  animation: slideAnimation 12s infinite;
}

.slides img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

/* Hiệu ứng trượt ảnh */
@keyframes slideAnimation {
  0% { transform: translateX(0); }
  33% { transform: translateX(-100%); }
  66% { transform: translateX(-200%); }
  100% { transform: translateX(0); }
}