/* ============================================================
   RESPONSIVE STYLES
   ============================================================ */

/* ===== LARGE DESKTOP (up to 1200px) ===== */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }

    .hero-content h1 {
        font-size: 42px;
    }

    .process-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }

    .process-steps::before {
        display: none;
    }

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

/* ===== DESKTOP (up to 992px) ===== */
@media (max-width: 992px) {
    .container {
        max-width: 720px;
    }

    :root {
        --header-height: 70px;
    }

    .top-bar {
        display: none;
    }

    /* Mobile Navigation */
    .header-nav {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 300px;
        height: calc(100vh - var(--header-height));
        background: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
        overflow-y: auto;
        z-index: 999;
    }

    .header-nav.active {
        right: 0;
    }

    .header-nav > ul {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }

    .header-nav > ul > li {
        width: 100%;
    }

    .header-nav > ul > li > a {
        padding: 12px 0;
        border-bottom: 1px solid var(--color-border-light);
        width: 100%;
    }

    .header-nav .dropdown-menu {
        position: static;
        box-shadow: none;
        padding: 0 0 0 15px;
        display: none;
        background: transparent;
        min-width: auto;
    }

    .header-nav .dropdown-menu.show {
        display: block;
    }

    .mobile-toggle {
        display: flex;
    }

    .mobile-overlay.active {
        display: block;
    }

    .header-actions .inquiry-btn {
        display: none;
    }

    .hero {
        height: 60vh;
        min-height: 450px;
    }

    .hero-content h1 {
        font-size: 34px;
    }

    .hero-content p {
        font-size: var(--font-size-base);
    }

    .company-intro .intro-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .page-header h1 {
        font-size: var(--font-size-3xl);
    }

    .about-story {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .inquiry-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-page .contact-grid {
        grid-template-columns: 1fr;
    }

    .product-detail {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .infrastructure-page .infra-detailed-grid {
        grid-template-columns: 1fr;
    }

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

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

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

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

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

/* ===== TABLET (up to 768px) ===== */
@media (max-width: 768px) {
    .container {
        max-width: 540px;
    }

    .section-padding {
        padding: 60px 0;
    }

    .section-title h2 {
        font-size: var(--font-size-2xl);
    }

    .hero-content h1 {
        font-size: 28px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .highlight-card {
        padding: 25px 20px;
    }

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

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

    .process-steps {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .infra-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .stat-item .stat-number {
        font-size: 32px;
    }

    .cta-section h2 {
        font-size: var(--font-size-2xl);
    }

    .cta-section .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .intro-text .features-list {
        grid-template-columns: 1fr;
    }

    .page-header {
        padding: 60px 0 40px;
    }

    .page-header h1 {
        font-size: var(--font-size-2xl);
    }

    .inquiry-form {
        padding: 25px;
    }

    .inquiry-info .contact-details .detail-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .contact-page .contact-info-cards {
        grid-template-columns: 1fr;
    }

    .product-tabs .tab-nav {
        flex-wrap: wrap;
    }

    .product-tabs .tab-nav button {
        padding: 10px 16px;
        font-size: var(--font-size-xs);
    }

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

    .export-process-grid {
        grid-template-columns: 1fr;
    }

    .gallery-masonry {
        grid-template-columns: 1fr;
    }

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

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

    .certifications-page .cert-grid {
        grid-template-columns: 1fr;
    }

    .intro-image .experience-badge {
        width: 100px;
        height: 100px;
        bottom: -15px;
        right: -15px;
    }

    .intro-image .experience-badge .number {
        font-size: 28px;
    }

    .page-404 .error-code {
        font-size: 80px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
}

/* ===== MOBILE (up to 576px) ===== */
@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }

    .section-padding {
        padding: 50px 0;
    }

    .hero {
        height: 55vh;
        min-height: 400px;
    }

    .hero-content h1 {
        font-size: 24px;
    }

    .hero-content .hero-badge {
        font-size: 10px;
        padding: 4px 14px;
    }

    .btn-primary,
    .btn-outline {
        padding: 12px 28px;
        font-size: var(--font-size-xs);
    }

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

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

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

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

    .gallery-masonry {
        grid-template-columns: 1fr;
    }

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

    .header-logo .logo-text {
        font-size: var(--font-size-sm);
    }

    .header-logo img {
        height: 35px;
    }

    .page-header {
        padding: 50px 0 30px;
    }

    .page-header h1 {
        font-size: var(--font-size-xl);
    }

    .hero-content p {
        font-size: var(--font-size-sm);
    }

    .inquiry-page .inquiry-wrapper {
        gap: 30px;
    }
}

/* ===== SMALL MOBILE (up to 400px) ===== */
@media (max-width: 400px) {
    .hero {
        height: 50vh;
        min-height: 350px;
    }

    .hero-content h1 {
        font-size: 20px;
    }

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