/* Reset CSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  /* Font chung */
  body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
  }
  
  /* Header */
  header {
    background-color: #1a1a2e;
    color: white;
    padding: 20px;
    text-align: center;
  }
  
  header h1 {
    font-size: 28px;
  }
  
  header p {
    color: #aaa;
    margin-top: 5px;
    font-size: 14px;
  }
    
  /* Nav */
  nav {
    background-color: #648bf5;
    padding: 10px;
    text-align: center;
  }
  
  nav ul {
    list-style: none;
  }
  
  nav ul li {
    display: inline;
    margin: 0 15px;
  }
  
  nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 16px;
  }
  
  nav ul li a:hover {
    color: #e94560;
  }
  
  /* Danh sách sản phẩm */
  .product-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 30px;
    max-width: 1000px;
    margin: 0 auto;
  }
  
  /* Card sản phẩm */
  .product-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    overflow: hidden;
    text-align: center;
  }
  
  .product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  }
  
  .product-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 10px;
  }
  
  .product-card h3 {
    font-size: 20px;
    margin: 15px 0 10px;
    color: #24243a;
  }
  
  .product-card p {
    color: #666;
    font-size: 14px;
    margin-bottom: 15px;
  }
  
  .product-card .price {
    font-size: 22px;
    font-weight: bold;
    color: #e63946;
    margin-bottom: 15px;
  }
  
  .product-card button {
    background-color: #1a1a2e;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    width: 100%;
    transition: 0.3s;
  }
  
  .product-card button:hover {
    background-color: #16213e;
  }
  
  /* Sidebar mạng xã hội */
  .sidebar {
    background-color: #16213e;
    color: white;
    padding: 20px;
    text-align: center;
  }
  
  .sidebar p {
    margin-bottom: 10px;
    font-size: 15px;
  }
  
  .social-icons a {
    color: #aaa;
    text-decoration: none;
    margin: 0 10px;
    font-size: 14px;
  }
  
  .social-icons a:hover {
    color: white;
  }
  
  /* Footer */
  footer {
    background-color: #1a1a2e;
    color: white;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 30px;
  }
  
  .footer-item h3 {
    margin-bottom: 10px;
    font-size: 16px;
    color: #e94560;
  }
  
  .footer-item p {
    font-size: 13px;
    color: #aaa;
    line-height: 1.8;
  }
  
  /* Responsive cho màn hình nhỏ */
  @media (max-width: 600px) {
    .product-list {
      grid-template-columns: 1fr;
    }
  
    footer {
      grid-template-columns: 1fr;
    }
  }