/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --container-padding: 1.5rem;
    }

    .hero {
        min-height: 70vh;
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Footer: collapse 4 → 2 columns at tablet widths */
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Homepage: Coverage layout stacks */
    .coverage-layout {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    /* Mobile menu toggle visible from tablet width down */
    .mobile-menu-toggle {
        display: flex;
    }

    /* Mobile nav menu */
    .navbar-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 2rem;
        gap: 0.5rem;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: var(--transition-base);
    }

    .navbar-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .navbar-menu.active .nav-item > a {
        color: var(--gray-900);
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        width: 100%;
        justify-content: space-between;
    }

    /* Nav CTA in mobile */
    .nav-cta {
        display: block;
        text-align: center;
        margin-top: 1rem;
    }

    /* Dropdown mobile */
    .dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        min-width: 0;
        width: 100%;
        padding: 0;
        margin-top: 0.5rem;
        display: none;
        border-radius: 0;
    }

    .has-dropdown.open > .dropdown {
        display: block;
    }
}

@media (max-width: 768px) {
    /* Hero stacking */
    .hero {
        grid-template-columns: 1fr;
        min-height: auto;
        padding: 3rem var(--container-padding);
    }

    .hero__model model-viewer {
        height: 350px;
    }

    .hero__ctas {
        flex-direction: column;
    }

    /* Stats grid — 2 columns on tablet */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Audience router — stack on mobile (legacy) */
    .audience-router__grid {
        grid-template-columns: 1fr;
    }

    /* Homepage: Audience grid — stack on mobile */
    .audience-grid {
        grid-template-columns: 1fr;
    }

    /* Homepage: Services grid — stack on mobile */
    .services-grid {
        grid-template-columns: 1fr;
    }

    /* Homepage: Fleet grid — stack on mobile */
    .fleet-grid {
        grid-template-columns: 1fr;
    }

    /* Homepage: Testimonials grid — stack on mobile */
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    /* Homepage: Coverage search — full width */
    .coverage-search {
        flex-direction: column;
    }

    .coverage-search__box {
        width: 100%;
    }

    /* Homepage: Trust logos — wrap */
    .trust-logos {
        gap: var(--space-4);
    }

    /* Homepage: Final CTA actions — stack */
    .final-cta__actions {
        flex-direction: column;
        gap: var(--space-4);
    }

    /* Orange split-section: solid on mobile (no gradient clip) */
    .section-primary-left {
        background: var(--primary-orange);
    }

    /* General grids */
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .model-viewer-container model-viewer {
        height: 280px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    /* Footer: collapse 2 → 1 column on phone widths */
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .footer-legal {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .nav-container {
        padding: 0 1rem;
    }

    .hero__description {
        font-size: 1rem;
    }

    .hero-description {
        font-size: 1.0625rem;
    }

    .stat-item__number {
        font-size: 2rem;
    }
}