/* ============================================================
   3D Technology Services — Design System: Layout
   Grid systems, section spacing, containers, and responsive.
   ============================================================ */

/* ── Containers ── */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.main-container {
    position: relative;
    z-index: var(--z-content);
}

/* ── Section Layout ── */
.section {
    padding: var(--space-3xl) var(--container-padding);
    position: relative;
    z-index: var(--z-content);
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-desc {
    font-family: var(--font-body);
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
    font-weight: 300;
    line-height: 1.8;
}

/* ── Hero Layout ── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem var(--container-padding) 4rem;
    position: relative;
    z-index: var(--z-content);
    overflow: hidden;
}

.hero-content {
    max-width: 900px;
}

.hero-description {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    font-weight: 300;
    line-height: 1.9;
    letter-spacing: 0.5px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-2xl);
}

.hero-metrics {
    display: flex;
    justify-content: center;
    gap: 5rem;
    padding-top: 4rem;
    border-top: 1px solid var(--border-dim);
}

/* ── Grid Systems ── */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

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

/* ── Responsive Breakpoints ── */
@media (max-width: 1200px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }

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

@media (max-width: 968px) {
    :root {
        --container-padding: 2rem;
        --space-3xl: 5rem;
    }

    .nav-container {
        grid-template-columns: 1fr auto;
        padding: 16px 24px;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 0.5rem;
        z-index: var(--z-nav);
        overflow-y: auto;
        padding: 80px 2rem 2rem;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        font-size: 1.1rem;
        letter-spacing: 3px;
    }

    /* Mobile dropdown sub-menus */
    .nav-dropdown-menu {
        position: static !important;
        transform: none !important;
        min-width: 0;
        max-height: 0;
        overflow: hidden;
        opacity: 1;
        visibility: visible;
        border: none;
        box-shadow: none;
        background: transparent;
        transition: max-height 0.3s ease;
        padding: 0;
    }

    .nav-dropdown-menu::before {
        display: none;
    }

    .nav-dropdown.open .nav-dropdown-menu {
        max-height: 400px;
        padding: 0.5rem 0;
    }

    .nav-dropdown-menu a {
        padding: 10px 20px !important;
        font-size: 0.85rem !important;
        letter-spacing: 1px !important;
        color: var(--text-muted) !important;
        border-left: none !important;
        text-align: center;
    }

    .nav-dropdown::after {
        display: none;
    }

    .nav-dropdown>a svg {
        transition: transform 0.3s ease;
    }

    .nav-dropdown.open>a svg {
        transform: rotate(180deg);
    }

    /* Mobile nav items need bigger tap targets */
    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links li>a {
        display: block;
        padding: 12px 0;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-cta {
        display: none;
    }

    /* Show CTA inside mobile menu when active */
    .nav-links.active~.nav-cta-mobile {
        display: flex;
    }

    /* Body scroll lock when nav is open */
    body.nav-open {
        overflow: hidden;
    }

    .grid-3 {
        grid-template-columns: 1fr;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .hero-metrics {
        gap: 3rem;
        flex-wrap: wrap;
    }

    .hero h1 {
        font-size: clamp(2.5rem, 6vw, 4rem);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .footer-licenses {
        flex-wrap: wrap;
        justify-content: center;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    :root {
        --container-padding: 1.25rem;
        --space-3xl: 4rem;
    }

    .nav-container {
        padding: 12px 16px;
    }

    .logo-container img {
        height: 32px;
    }

    .logo-text {
        font-size: 0.75rem;
        letter-spacing: 0.2em;
    }

    .hero {
        padding-top: 6rem;
        padding-bottom: 3rem;
        min-height: auto;
    }

    .hero-metrics {
        gap: 1.5rem;
        flex-direction: column;
        align-items: center;
    }

    .metric-value {
        font-size: 2.5rem;
    }

    .btn {
        padding: 0.9rem 1.5rem;
        font-size: 0.7rem;
        width: 100%;
        justify-content: center;
        min-height: 48px;
    }

    /* Contact section full stack on mobile */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-info h3 {
        font-size: 2rem;
    }

    .contact-form-wrapper {
        padding: 1.5rem;
    }

    /* Testimonials single column */
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    /* AI chat full width on mobile */
    .ai-chat-window {
        width: calc(100vw - 1rem) !important;
        right: -0.5rem !important;
        bottom: 70px !important;
        height: 70vh;
        max-height: calc(100vh - 90px);
    }

    .ai-toggle {
        width: 52px;
        height: 52px;
    }

    /* Better tap targets for service cards */
    .service-link {
        padding: 1.25rem 1.5rem 1.75rem;
        min-height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Partner section on mobile */
    .partners-track {
        gap: 3rem;
    }

    .partner-icon {
        height: 28px;
    }

    .partner-name {
        font-size: 0.65rem;
        letter-spacing: 2px;
    }

    /* Better form inputs on mobile */
    .form-group input,
    .form-group textarea,
    .form-group select {
        font-size: 16px;
        /* Prevents iOS zoom on focus */
        padding: 0.875rem 1rem;
        min-height: 48px;
    }

    /* Footer mobile improvements */
    .footer-column h4 {
        font-size: 1rem;
    }

    .footer-column a {
        padding: 6px 0;
        display: inline-block;
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    /* Service tags: disable hover tooltips on touch */
    .service-tag:hover::after,
    .service-tag:hover::before {
        display: none;
    }

    /* About stats 2-col on mobile */
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    /* Team grid in about section */
    .team-grid {
        grid-template-columns: 1fr;
    }

    .team-member {
        min-height: 48px;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    /* Credential cards */
    .credentials-grid {
        grid-template-columns: 1fr;
    }

    .credential-card {
        padding: 2rem 1.5rem;
    }

    /* Section headers */
    .section-desc {
        font-size: 0.9rem;
    }

    /* Project overlay text */
    .project-overlay {
        padding: 1.25rem;
    }

    .project-card h4 {
        font-size: 1.2rem;
    }
}

/* ── Very small phones (iPhone SE, etc.) ── */
@media (max-width: 380px) {
    :root {
        --container-padding: 1rem;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .logo-divider {
        display: none;
    }

    .logo-text {
        display: none;
    }

    .approach-card {
        padding: 2.5rem 1.5rem;
    }

    .service-card .service-number,
    .service-card h3,
    .service-card p,
    .service-card .service-tags {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .about-stat-value {
        font-size: 1.5rem;
    }

    .about-stat-label {
        font-size: 0.55rem;
        letter-spacing: 1px;
    }
}