@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    h1 {
        font-size: 2rem;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: var(--shadow-md);
        padding: 1rem;
    }
    .main-nav.active {
        display: block;
    }
    .main-nav ul {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    .nav-toggle {
        display: block;
    }
    .two-columns {
        grid-template-columns: 1fr;
    }
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    .section {
        padding: 2rem 0;
    }
    .big-stat {
        flex-basis: 100%;
    }
    .savings-grid {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .impact-grid {
        flex-direction: column;
    }
}