@media screen and (max-width: 768px) {
    .columns {
        grid-template-columns: repeat(2, minmax(200px, 1fr));
    }

    h1 {
        font-size: 1.5em;
    }

    h2 {
        font-size: 1.2em;
    }

    p {
        padding-left: 5%;
        padding-right: 5%;
    }

    .hero-slider {
        height: 400px;
    }
}

@media screen and (max-width: 480px) {
    .columns {
        grid-template-columns: 1fr;
    }

    .nav-container {
        padding: 10px 0;
    }

    .nav ul {
        justify-content: space-around;
    }

    .nav ul li a {
        padding: 5px 10px;
    }

    h1 {
        font-size: 1.2em;
        letter-spacing: 0.1em;
    }

    p {
        font-size: 0.9em;
        letter-spacing: 0.1em;
    }

    .hero-slider {
        height: 300px;
    }

    .flex-grid img {
        width: 50%;
    }
}