@media (max-width: 960px) {
    .product-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .nav-wrap {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        flex-wrap: wrap;
    }

    .site-header h1 {
        font-size: 1.2rem;
    }

    .product-grid {
        grid-template-columns: 1fr;
    }

    .cart-item {
        flex-direction: column;
    }

    .container {
        width: 94%;
    }
}