/* ✅ Professional Styling */
        body {
            font-family: Arial, sans-serif;
            background: #f4f6f9;
            margin: 0;
            padding: 0;
        }
        .product-detail-container {
            display: flex;
            max-width: 1000px;
            margin: 40px auto;
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            overflow: hidden;
        }
        .product-image {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #fafafa;
            padding: 20px;
        }
        .product-image img {
            max-width: 100%;
            border-radius: 8px;
        }
        .product-info {
            flex: 1;
            padding: 30px;
        }
        .product-info h1 {
            font-size: 26px;
            margin-bottom: 15px;
            color: #2c3e50;
        }
        .product-description {
            color: #555;
            margin-bottom: 20px;
            line-height: 1.6;
        }
        .product-price, .product-stock {
            font-size: 18px;
            margin-bottom: 10px;
            color: #27ae60;
        }
        .add-to-cart-form {
            margin-top: 20px;
        }
        .add-to-cart-form input[type="number"] {
            width: 70px;
            padding: 6px;
            font-size: 16px;
            margin-right: 10px;
        }
        .btn-add-to-cart {
            background: #3498db;
            color: white;
            border: none;
            padding: 10px 18px;
            font-size: 16px;
            border-radius: 6px;
            cursor: pointer;
            transition: 0.3s;
        }
        .btn-add-to-cart:hover {
            background: #2980b9;
        }
        .back_btn {
            margin-top: 20px;
            background: #7f8c8d;
            color: white;
            border: none;
            padding: 10px 18px;
            border-radius: 6px;
            cursor: pointer;
            transition: 0.3s;
        }
        .back_btn:hover {
            background: #606c76;
        }