@media (max-width: 768px) {
    .menu-toggle { display: block; }

    nav {
        position: absolute;
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: 0.3s;
    }

    nav.active { max-height: 350px; }

    nav ul {
        flex-direction: column;
        text-align: center;
    }
}

/* ====================================================
    13. RESPONSIVE DESIGN
    ==================================================== */

/* Tablet Devices (max-width: 1024px) */
@media (max-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid,
    .about-grid,
    .pricing-grid,
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
    
    .footer-row {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    /* Center text/content within columnized footer sections */
    .footer-brand {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-info {
        justify-content: center;
    }

    .footer-social {
        justify-content: center;
    }
}

/* Mobile Devices (max-width: 768px) */
@media (max-width: 768px) {
    /* Header & Navigation */
    .menu-toggle {
        display: block;
    }
    
    nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--card-bg);
        box-shadow: var(--shadow);
        overflow: hidden;
        max-height: 0;
        transition: max-height 0.35s ease;
    }
    
    nav.active {
        max-height: 350px; /* Sufficient height for mobile menu content */
    }
    
    nav ul {
        flex-direction: column;
        padding: 20px 0;
        gap: 15px;
    }
    
    nav ul li {
        margin: 0;
        text-align: center;
    }
    
    /* Hero Section */
    .hero {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    /* General Layout */
    .single-column {
        padding: 50px 0;
        gap: 30px;
    }
    
    .section {
        margin-bottom: 40px;
    }
    
    /* Contact Section */
    .contact-wrapper,
    .calculator-box {
        padding: 25px;
    }
    
    .contact-grid {
        gap: 25px;
    }
    
    /* Radio Buttons */
    .radio-list {
        grid-template-columns: 1fr;
    }
    
    /* Calculator Buttons */
    .button-group,
    .feature-buttons {
        grid-template-columns: 1fr;
    }
    
    /* Pricing */
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    /* Additional Details */
    .details-list {
        grid-template-columns: 1fr;
    }
    
}