body {
    margin: 0;
    font-family: "Poppins", sans-serif;
    background: #f8f9fa;
    color: #222;
  }
  
  header {
    background: #fff;
    padding: 1rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  .logo {
    font-weight: 700;
    font-size: 1.6rem;
    color: #0a4d68;
  }
  
  nav a {
    margin-left: 1.5rem;
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: 0.3s;
  }
  nav a:hover, nav a.active {
    color: #0a4d68;
  }
  
  .container {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-start;
  }
  
  .product-img {
    flex: 1 1 45%;
  }
  .product-img img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  }
  
  .product-details {
    flex: 1 1 45%;
  }
  .product-details h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: #0a4d68;
  }
  .product-details p {
    line-height: 1.6;
    margin-bottom: 1rem;
  }
  .price {
    font-size: 1.6rem;
    color: #0a4d68;
    font-weight: 600;
    margin-bottom: 1rem;
  }
  
  button {
    background: #0a4d68;
    color: white;
    border: none;
    padding: 0.9rem 1.7rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
  }
  button:hover {
    background: #0a4d68;
  }
  
  footer {
    background: #222;
    color: #eee;
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
  }
  
  .cart-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  }
  .cart-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid #ddd;
    padding: 1rem 0;
  }
  .cart-item img {
    width: 80px;
    border-radius: 6px;
  }
  .cart-summary {
    text-align: right;
    margin-top: 1rem;
  }