@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 15px;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .newsletter-signup form {
        flex-direction: column;
        align-items: center;
    }

    .newsletter-signup input {
        width: 100%;
        max-width: 300px;
    }

    .features-grid {
        flex-direction: column;
        gap: 40px;
    }
}