/* =====================================================
   LED24H - Responsive Stylesheet
   Giao diện responsive cho mobile và tablet
   ===================================================== */

/* =====================================================
   BREAKPOINTS
   ===================================================== */

/* Extra Large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
    
    .banner-title {
        font-size: 3.5rem;
    }
    
    .section-title {
        font-size: 3rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .product-content {
        padding: 25px;
    }
    
    .product-title {
        font-size: 1.25rem;
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    .product-actions .btn {
        padding: 14px 24px;
        font-size: 1rem;
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1199.98px) {
    .container {
        max-width: 960px;
    }
    
    .banner-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .product-content {
        padding: 22px;
    }
    
    .product-title {
        font-size: 1.2rem;
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    .product-actions .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .solutions-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
    .container {
        max-width: 720px;
    }
    
    /* Header */
    .header-content {
        padding: 15px 0;
        gap: 20px;
    }
    
    .logo-text {
        font-size: 24px;
    }
    
    .nav-menu {
        gap: 25px;
    }
    
    .nav-link {
        font-size: 14px;
    }
    
    /* Banner */
    .banner-title {
        font-size: 2.5rem;
    }
    
    .banner-description {
        font-size: 1.1rem;
    }
    
    /* Sections */
    .section-title {
        font-size: 2.2rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    .product-content {
        padding: 20px;
    }
    
    .product-title {
        font-size: 1.15rem;
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    .product-actions .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    /* Footer */
    .footer-contact-bar {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }
    
    .contact-divider {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    /* CTA */
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-actions .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    .container {
        max-width: 540px;
        padding: 0 15px;
    }
    
    /* Header */
    .header-content {
        padding: 12px 0;
        gap: 15px;
    }
    
    .logo-text {
        font-size: 22px;
    }
    
    .nav-menu {
        display: flex;
        flex-direction: column;
        gap: 0;
    }
    
    .language-selector {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Banner */
    .hero-banner {
        height: 400px;
    }
    
    .banner-title {
        font-size: 2rem;
    }
    
    .banner-description {
        font-size: 1rem;
    }
    
    .banner-prev,
    .banner-next {
        width: 40px;
        height: 40px;
    }
    
    .banner-prev {
        left: 15px;
    }
    
    .banner-next {
        right: 15px;
    }
    
    /* Sections */
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .stat-item {
        padding: 20px;
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .stat-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .product-content {
        padding: 18px;
    }
    
    .product-title {
        font-size: 1.1rem;
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    .product-actions .btn {
        padding: 10px 16px;
        font-size: 0.85rem;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .solution-card {
        padding: 30px 20px;
    }
    
    .solution-icon {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    /* Footer */
    .footer-top {
        padding: 30px 0;
    }
    
    .footer-contact-bar {
        flex-direction: column;
        gap: 25px;
        text-align: center;
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .contact-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .footer-main {
        padding: 40px 0 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
        padding: 0 15px;
        width: 100%;
        max-width: 100%;
    }
    
    .footer-about {
        max-width: none;
        margin-bottom: 20px;
    }
    
    .social-media {
        justify-content: center;
        margin-bottom: 20px;
    }
    
    .footer-links {
        margin-bottom: 20px;
    }
    
    .address-info {
        margin-bottom: 20px;
    }
    
    /* Footer CTA */
    .footer-cta {
        padding: 60px 0;
    }
    
    .footer-cta .cta-title {
        font-size: 2rem;
    }
    
    .footer-cta .cta-description {
        font-size: 1.1rem;
    }
    
    .footer-cta .cta-actions {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .footer-cta .cta-actions .btn {
        width: 100%;
        max-width: 280px;
    }
    
    /* Footer Contact Banner */
    .footer-contact-banner {
        padding: 30px 0;
    }
    
    .footer-contact-banner .contact-banner-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .footer-contact-banner .contact-banner-left {
        flex-direction: column;
        gap: 15px;
    }
    
    .footer-contact-banner .contact-banner-left i {
        font-size: 28px;
    }
    
    .footer-contact-banner .contact-banner-title {
        font-size: 1.3rem;
    }
    
    .footer-contact-banner .contact-banner-subtitle {
        font-size: 0.9rem;
    }
    
    .footer-contact-banner .contact-banner-btn {
        padding: 12px 20px;
        font-size: 14px;
    }
}

/* Extra small devices (portrait phones, less than 576px) */
@media (max-width: 575.98px) {
    .container {
        padding: 0 10px;
    }
    
    /* Typography */
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.6rem; }
    h3 { font-size: 1.4rem; }
    h4 { font-size: 1.2rem; }
    h5 { font-size: 1.1rem; }
    h6 { font-size: 1rem; }
    
    /* Header */
    .header-content {
        padding: 10px 0;
        gap: 10px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
    }
    
    .nav-menu {
        display: flex;
        flex-direction: column;
        gap: 0;
    }
    
    .language-selector {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Top Banner */
    .top-banner {
        padding: 8px 0;
    }
    
    .banner-content {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .banner-left {
        flex-direction: column;
        gap: 8px;
    }
    
    .banner-title {
        font-size: 16px;
    }
    
    .banner-subtitle {
        font-size: 12px;
    }
    
    .contact-btn {
        padding: 8px 16px;
        font-size: 14px;
    }
    
    /* Banner */
    .hero-banner {
        height: 300px;
    }
    
    .banner-title {
        font-size: 1.8rem;
        margin-bottom: 15px;
    }
    
    .banner-description {
        font-size: 0.95rem;
        margin-bottom: 20px;
    }
    
    .banner-btn {
        font-size: 14px;
        padding: 12px 24px;
    }
    
    .banner-prev,
    .banner-next {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
    
    .banner-prev {
        left: 10px;
    }
    
    .banner-next {
        right: 10px;
    }
    
    .banner-dots {
        bottom: 20px;
    }
    
    .banner-dot {
        width: 10px;
        height: 10px;
    }
    
    /* Sections */
    .section-header {
        margin-bottom: 30px;
    }
    
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 10px;
    }
    
    .section-subtitle {
        font-size: 0.95rem;
    }
    
    .stats-section {
        padding: 40px 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .stat-item {
        padding: 15px;
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .stat-icon {
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
    
    .stat-label {
        font-size: 14px;
    }
    
    .featured-products,
    .solutions-section,
    .latest-news {
        padding: 50px 0;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .solutions-grid,
    .news-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .product-card,
    .solution-card,
    .news-card {
        margin-bottom: 0;
    }
    
    .product-content {
        padding: 15px;
    }
    
    .product-title {
        font-size: 1rem;
        line-height: 1.3;
        margin-bottom: 10px;
    }
    
    .product-actions .btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    .news-content {
        padding: 20px;
    }
    
    .solution-card {
        padding: 25px 15px;
    }
    
    .solution-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
        margin-bottom: 20px;
    }
    
    .solution-title {
        font-size: 1.3rem;
        margin-bottom: 12px;
    }
    
    .solution-description {
        font-size: 14px;
        margin-bottom: 20px;
    }
    
    .product-footer {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }
    
    .product-price {
        text-align: center;
    }
    
    .product-btn {
        width: 100%;
    }
    
    .news-footer {
        flex-direction: column;
        gap: 10px;
        align-items: center;
    }
    
    .news-views {
        font-size: 12px;
    }
    
    /* Footer */
    .footer-top {
        padding: 25px 0;
    }
    
    .footer-contact-bar {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .contact-item {
     
        text-align: center;
        gap: 8px;
    }
    .contact-icon {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
    
    .contact-info h4 {
        font-size: 14px;
    }
    
    .contact-info p {
        font-size: 12px;
    }
    
    .footer-main {
        padding: 30px 0 20px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 20px;
        text-align: center;
        padding: 0 10px;
        width: 100%;
        max-width: 100%;
    }
    
    .footer-about {
        max-width: none;
        margin-bottom: 15px;
    }
    
    .footer-logo {
        justify-content: center;
        margin-bottom: 15px;
    }
    
    .footer-links {
        margin-bottom: 15px;
    }
    
    .address-info {
        margin-bottom: 15px;
    }
    
    .footer-logo .logo-text {
        font-size: 20px;
    }
    
    .company-slogan {
        font-size: 14px;
        margin-bottom: 20px;
    }
    
    .social-media {
        justify-content: center;
        gap: 10px;
    }
    
    .social-link {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
    
    .footer-title {
        font-size: 16px;
        margin-bottom: 15px;
    }
    
    .footer-links {
        gap: 10px;
    }
    
    .footer-links a {
        font-size: 13px;
    }
    
    .address-info {
        gap: 15px;
    }
    
    .address-item h5 {
        font-size: 14px;
        margin-bottom: 6px;
    }
    
    .address-item p {
        font-size: 12px;
    }
    
    .footer-bottom {
        padding: 15px 0;
    }
    
    .copyright {
        font-size: 12px;
    }
    
    /* Footer CTA */
    .footer-cta {
        padding: 50px 0;
    }
    
    .footer-cta .cta-title {
        font-size: 1.8rem;
        margin-bottom: 15px;
    }
    
    .footer-cta .cta-description {
        font-size: 1rem;
        margin-bottom: 30px;
    }
    
    .footer-cta .cta-actions {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .footer-cta .cta-actions .btn {
        width: 100%;
        max-width: 250px;
        font-size: 14px;
        padding: 12px 20px;
    }
    
    /* Footer Contact Banner */
    .footer-contact-banner {
        padding: 25px 0;
    }
    
    .footer-contact-banner .contact-banner-content {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .footer-contact-banner .contact-banner-left {
        flex-direction: column;
        gap: 10px;
    }
    
    .footer-contact-banner .contact-banner-left i {
        font-size: 24px;
    }
    
    .footer-contact-banner .contact-banner-title {
        font-size: 1.2rem;
    }
    
    .footer-contact-banner .contact-banner-subtitle {
        font-size: 0.85rem;
    }
    
    .footer-contact-banner .contact-banner-btn {
        padding: 10px 18px;
        font-size: 13px;
    }
    
    /* Scroll to top */
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 16px;
    }
    
    /* Products Page */
    .products-section {
        padding: 40px 0;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .page-description {
        font-size: 1rem;
    }
    
    .products-filters {
        padding: 20px;
    }
    
    .filters-row {
        flex-direction: column;
        gap: 20px;
    }
    
    .filter-group {
        min-width: auto;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .product-content {
        padding: 18px;
    }
    
    .product-title {
        font-size: 1.1rem;
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    .product-actions .btn {
        padding: 10px 16px;
        font-size: 0.85rem;
    }
    
    .product-actions {
        flex-direction: column;
    }
    
    .pagination {
        flex-wrap: wrap;
        gap: 5px;
    }
    
    .pagination-btn {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .pagination-number {
        padding: 8px 12px;
        min-width: 40px;
    }
    
    /* Mobile - 2 columns */
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    /* Breadcrumb */
    .breadcrumb-nav {
        padding: 10px 0;
    }
    
    .breadcrumb {
        gap: 6px;
    }
    
    .breadcrumb-link,
    .breadcrumb-text {
        font-size: 12px;
    }
    
    .breadcrumb-link i {
        display: none;
    }
    
    .breadcrumb-separator {
        margin: 0 4px;
    }
    
    /* Buttons */
    .btn {
        font-size: 13px;
        padding: 10px 18px;
        min-height: 40px;
    }
    
    .btn-lg {
        font-size: 14px;
        padding: 14px 28px;
        min-height: 48px;
    }
    
    .btn-sm {
        font-size: 11px;
        padding: 6px 12px;
        min-height: 32px;
    }
    
    /* Mobile Menu */
    .mobile-menu-content {
        width: 280px;
        padding: 15px;
    }
    
    .mobile-nav-link {
        padding: 12px 0;
        font-size: 14px;
    }
    
    .mobile-nav-link i {
        font-size: 16px;
    }
    
    .mobile-submenu {
        padding-left: 28px;
    }
    
    .mobile-submenu a {
        font-size: 13px;
        padding: 6px 0;
    }
    
    .mobile-language {
        margin-top: 25px;
        padding-top: 15px;
    }
    
    .mobile-language h4 {
        font-size: 14px;
        margin-bottom: 12px;
    }
    
    .mobile-lang-option {
        padding: 8px 0;
        font-size: 13px;
    }
    
    .mobile-lang-option img {
        width: 18px;
        height: 12px;
    }
}

/* =====================================================
   LANDSCAPE ORIENTATION
   ===================================================== */

@media (max-height: 500px) and (orientation: landscape) {
    .hero-banner {
        height: 250px;
    }
    
    .banner-title {
        font-size: 1.5rem;
    }
    
    .banner-description {
        font-size: 0.9rem;
        margin-bottom: 15px;
    }
    
    .banner-btn {
        font-size: 13px;
        padding: 10px 20px;
    }
    
    .stats-section,
    .featured-products,
    .solutions-section,
    .latest-news,
    .cta-section {
        padding: 30px 0;
    }
    
    .section-title {
        font-size: 1.6rem;
        margin-bottom: 10px;
    }
    
    .section-subtitle {
        font-size: 0.9rem;
        margin-bottom: 20px;
    }
}

/* =====================================================
   HIGH DPI DISPLAYS
   ===================================================== */

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .logo-icon,
    .stat-icon,
    .solution-icon,
    .contact-icon,
    .social-link {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}

/* =====================================================
   REDUCED MOTION
   ===================================================== */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .banner-slide {
        transition: none;
    }
    
    .btn:hover,
    .product-card:hover,
    .news-card:hover,
    .solution-card:hover {
        transform: none;
    }
}

/* =====================================================
   DARK MODE SUPPORT
   ===================================================== */

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e9ecef;
        --text-secondary: #adb5bd;
        --text-muted: #6c757d;
        --bg-primary: #1a1a1a;
        --bg-secondary: #2d2d2d;
        --border-color: #404040;
        --border-light: #333;
    }
    
    body {
        background-color: var(--bg-primary);
        color: var(--text-primary);
    }
    
    .main-header {
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
    }
    
    .product-card,
    .news-card,
    .solution-card,
    .stat-item {
        background-color: var(--bg-secondary);
        border: 1px solid var(--border-color);
    }
    
    .dropdown-menu {
        background-color: #fff;
        border: 1px solid #e0e0e0;
    }
    
    .lang-dropdown {
        background-color: var(--bg-secondary);
        border: 1px solid var(--border-color);
    }
}

/* =====================================================
   ACCESSIBILITY IMPROVEMENTS
   ===================================================== */

/* Focus styles for keyboard navigation */
.btn:focus,
.nav-link:focus,
.dropdown-link:focus,
.lang-option:focus,
.social-link:focus-visible,
.scroll-to-top:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.social-link:focus:not(:focus-visible),
.scroll-to-top:focus:not(:focus-visible) {
    outline: none;
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .btn-primary {
        background-color: #000;
        border-color: #000;
        color: #fff;
    }
    
    .btn-outline {
        border-color: #000;
        color: #000;
    }
    
    .btn-outline:hover {
        background-color: #000;
        color: #fff;
    }
}

/* =====================================================
   PRINT RESPONSIVE
   ===================================================== */

@media print {
    .container {
        max-width: none;
        padding: 0;
    }
    
    .hero-banner,
    .stats-section,
    .cta-section,
    .main-footer {
        break-inside: avoid;
    }
    
    .products-grid,
    .solutions-grid,
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .product-card,
    .solution-card,
    .news-card {
        break-inside: avoid;
        margin-bottom: 20px;
    }
}