/* ═══════════════════════════════════════════════════════════════
   VRKP NEXA — Responsive Styles
   Breakpoints: 1440, 1200, 1024, 768, 480, 320
   ═══════════════════════════════════════════════════════════════ */

/* ── 1440px and below ───────────────────────────────────────── */
@media (max-width: 1440px) {
    :root {
        --fs-hero: 5rem;
        --fs-6xl: 4.5rem;
        --fs-5xl: 3.5rem;
    }
}

/* ── 1200px and below ───────────────────────────────────────── */
@media (max-width: 1200px) {
    :root {
        --fs-hero: 4.5rem;
        --fs-5xl: 3rem;
        --fs-4xl: 2.5rem;
    }

    .site-footer__grid {
        grid-template-columns: 2fr 1fr 1fr;
        gap: var(--sp-10);
    }

    .site-footer__grid .footer-col:last-child {
        grid-column: 1 / -1;
        display: grid;
        grid-template-columns: auto 1fr;
        gap: var(--sp-8);
        padding-top: var(--sp-8);
        border-top: 1px solid rgba(255,255,255,0.08);
    }
}

/* ── 1024px and below (Tablet Landscape) ────────────────────── */
@media (max-width: 1024px) {
    :root {
        --fs-hero: 3.5rem;
        --fs-5xl: 2.75rem;
        --fs-4xl: 2.25rem;
        --fs-3xl: 2rem;
    }

    .container {
        padding: 0 var(--sp-6);
    }

    /* Navigation */
    .site-nav__menu,
    .site-nav__cta {
        display: none;
    }

    .site-nav__toggle {
        display: block;
    }

    .site-nav__inner {
        height: 80px !important;
    }

    .logo-image {
        height: 70px !important;
        max-width: 70vw;
        object-fit: contain;
    }

    .mobile-menu {
        display: block;
        top: 80px;
    }

    /* Hero */
    .hero__content {
        padding-top: var(--sp-24);
    }

    .hero__title {
        font-size: var(--fs-hero);
    }

    /* Split layouts */
    .split {
        grid-template-columns: 1fr;
        gap: var(--sp-10);
    }

    .split--asymmetric,
    .split--asymmetric-reverse {
        grid-template-columns: 1fr;
    }

    .split__content {
        padding-right: 0;
    }

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

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

    /* Masonry */
    .masonry {
        columns: 2;
    }

    /* Footer */
    .site-footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--sp-10);
    }

    .site-footer__grid .footer-col:first-child {
        grid-column: 1 / -1;
    }

    .site-footer__grid .footer-col:last-child {
        grid-column: 1 / -1;
        display: block;
    }

    /* Rib Comparison */
    .rib-comparison {
        grid-template-columns: 1fr;
        gap: var(--sp-6);
    }

    /* Timeline */
    .timeline::before {
        left: 20px;
    }

    .timeline__item {
        grid-template-columns: 1fr;
        padding-left: 50px;
    }

    .timeline__item::before {
        left: 20px;
    }

    .timeline__year {
        text-align: left;
        padding-right: 0;
        font-size: var(--fs-2xl);
    }

    .timeline__content {
        padding-left: 0;
    }

    /* Section spacing */
    .section {
        padding: var(--sp-20) 0;
    }

    .section--lg {
        padding: var(--sp-24) 0;
    }
}

/* ── 768px and below (Tablet Portrait) ──────────────────────── */
@media (max-width: 768px) {
    :root {
        --fs-hero: 2.75rem;
        --fs-5xl: 2.25rem;
        --fs-4xl: 2rem;
        --fs-3xl: 1.75rem;
        --fs-2xl: 1.5rem;
    }

    .container {
        padding: 0 var(--sp-5);
    }

    /* Hero */
    .hero {
        min-height: 85vh;
    }

    .hero--compact {
        min-height: 60vh;
    }

    .hero__content {
        padding-top: var(--sp-20);
        padding-bottom: var(--sp-12);
    }

    .hero__subtitle {
        font-size: var(--fs-base);
    }

    .hero__actions {
        flex-direction: column;
        gap: var(--sp-3);
    }

    .hero__actions .btn {
        width: 100%;
    }

    .hero__bottom .container {
        flex-direction: column;
        gap: var(--sp-3);
        text-align: center;
    }

    /* Buttons */
    .btn {
        padding: var(--sp-3) var(--sp-4);
        font-size: var(--fs-xs);
        white-space: normal;
        text-align: center;
        line-height: 1.4;
        min-width: 0;
    }
    
    html, body {
        overflow-x: hidden;
        word-wrap: break-word;
        width: 100%;
        max-width: 100vw;
    }

    /* Feature grid */
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .feature-grid__item {
        padding: var(--sp-8);
        border-right: none;
    }

    .feature-grid__item:nth-last-child(-n+2) {
        border-bottom: 1px solid var(--nexa-border);
    }

    .feature-grid__item:last-child {
        border-bottom: none;
    }

    /* Product cards grid */
    .grid-2 {
        grid-template-columns: 1fr;
    }

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

    .grid-4 {
        grid-template-columns: 1fr;
    }

    /* Application cards */
    .grid-6 {
        grid-template-columns: 1fr 1fr;
    }

    /* Spec table */
    .spec-table {
        font-size: var(--fs-xs);
    }

    .spec-table thead th,
    .spec-table tbody td {
        padding: var(--sp-3) var(--sp-4);
    }

    /* Forms */
    .form-grid {
        grid-template-columns: 1fr;
    }

    /* Step form */
    .step-form__progress {
        flex-wrap: wrap;
        gap: var(--sp-2);
    }

    .step-form__progress::before {
        display: none;
    }

    .step-indicator__label {
        display: none;
    }

    /* Footer */
    .site-footer__grid {
        grid-template-columns: 1fr;
        gap: var(--sp-8);
        padding: 0 var(--sp-4);
    }
    
    .footer-logo img {
        max-width: 80%;
    }

    .site-footer__grid .footer-col:first-child {
        grid-column: 1;
    }

    .site-footer__legal {
        flex-direction: column;
        gap: var(--sp-4);
        text-align: center;
    }

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

    /* Masonry */
    .masonry {
        columns: 1;
    }

    /* Pre-Footer CTA */
    .prefooter-cta {
        padding: var(--sp-20) 0;
    }

    .prefooter-cta__title {
        font-size: var(--fs-3xl);
    }

    .prefooter-cta__actions {
        flex-direction: column;
        align-items: center;
    }

    /* Section spacing */
    .section {
        padding: var(--sp-16) 0;
    }

    .section-header {
        margin-bottom: var(--sp-10);
    }

    /* Manufacturing steps */
    .mfg-step {
        min-width: 200px;
    }

    /* 3D container */
    .tmt-3d-container {
        height: 350px;
    }

    /* Dealer search */
    .dealer-search {
        flex-direction: column;
    }

    /* Job cards */
    .job-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--sp-4);
    }

    /* Cert cards */
    .cert-card {
        flex-direction: column;
        align-items: flex-start;
    }

    /* Filter bar */
    .filter-bar {
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        padding-bottom: var(--sp-2);
    }

    .filter-bar::-webkit-scrollbar {
        display: none;
    }

    .filter-btn {
        flex-shrink: 0;
    }

    /* Calculator */
    .calculator {
        padding: var(--sp-6);
    }

    /* Download items */
    .download-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--sp-3);
    }
}

/* ── 480px and below (Mobile) ───────────────────────────────── */
@media (max-width: 480px) {
    :root {
        --fs-hero: 2rem;
        --fs-5xl: 1.75rem;
        --fs-4xl: 1.5rem;
        --fs-3xl: 1.25rem;
        --fs-2xl: 1.125rem;
    }

    .logo-image {
        height: 65px !important;
        max-width: 80vw;
    }

    .mobile-menu {
        top: 60px;
    }

    .container {
        padding: 0 var(--sp-4);
    }

    /* Hero */
    .hero__label {
        font-size: 0.625rem;
    }

    .hero__content {
        padding-top: var(--sp-16);
    }

    /* Section */
    .section {
        padding: var(--sp-12) 0;
    }

    .section-title {
        font-size: var(--fs-3xl);
    }

    /* Grid */
    .grid-6 {
        grid-template-columns: 1fr;
    }

    /* App cards */
    .app-card {
        aspect-ratio: 3/4;
    }

    /* Product card */
    .product-card {
        padding: var(--sp-6);
    }

    .product-card__grade {
        font-size: var(--fs-2xl);
    }

    /* Manufacturing */
    .mfg-step {
        min-width: 180px;
        padding: var(--sp-6) var(--sp-5);
    }

    .mfg-step__number {
        font-size: var(--fs-3xl);
    }

    /* Mobile menu */
    .mobile-nav-link {
        font-size: var(--fs-base);
        padding: var(--sp-4) 0;
    }

    /* Rib comparison */
    .rib-comparison__panel {
        padding: var(--sp-6);
    }

    .rib-diagram {
        font-size: var(--fs-xs);
    }

    /* Step form progress */
    .step-indicator__circle {
        width: 32px;
        height: 32px;
        font-size: var(--fs-xs);
    }

    .step-form__actions {
        flex-direction: column-reverse;
        gap: var(--sp-3);
    }

    .step-form__actions .btn {
        width: 100%;
    }
}

/* ── 320px (Small Phones) ───────────────────────────────────── */
@media (max-width: 320px) {
    :root {
        --fs-hero: 1.75rem;
    }

    .container {
        padding: 0 var(--sp-2);
    }

    .hero__title {
        font-size: var(--fs-hero);
    }
    
    .logo-image {
        max-width: 50vw;
    }
}

/* ── Hover capability detection ─────────────────────────────── */
@media (hover: none) {
    .nav-link::after {
        display: none;
    }

    .mfg-step:hover {
        transform: none;
    }

    .app-card:hover .app-card__image img {
        transform: none;
    }

    .project-card:hover .project-card__image img {
        transform: none;
    }
}

/* ── Reduced Motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal-up,
    .reveal-left,
    .reveal-right,
    .reveal-fade {
        opacity: 1;
        transform: none;
    }
}

/* ── Print Styles ───────────────────────────────────────────── */
@media print {
    .site-nav,
    .site-footer,
    .prefooter-cta,
    .hero__actions,
    .mobile-menu {
        display: none !important;
    }

    .hero {
        min-height: auto;
        padding: 2rem 0;
    }

    .hero__overlay {
        background: none;
    }

    .hero__title,
    .hero__subtitle {
        color: #000 !important;
    }

    .section {
        padding: 1.5rem 0;
    }

    body {
        font-size: 12pt;
    }
}