/* ===================================
   RESPONSIVE STYLES - Bổ sung cho modern-base.css
   =================================== */

/* Header Responsive Styles */
@media (max-width: 1024px) {
    .header-actions {
        gap: var(--spacing-sm);
    }
    
    .header-actions .cta-button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--text-sm);
    }
    
    .site-header {
        padding: var(--spacing-sm) 0;
    }
}

@media (max-width: 768px) {
    .site-header {
        padding: var(--spacing-sm) 0;
        position: relative;
    }
    
    .header-content {
        padding: 0 var(--spacing-sm);
    }
    
    .header-row {
        display: grid;
        grid-template-columns: 1fr auto auto;
        grid-template-areas: "logo search menu";
        align-items: center;
        gap: var(--spacing-sm);
        width: 100%;
    }
    
    .header-logo {
        grid-area: logo;
        justify-self: start;
    }
    
    .header-navigation {
        order: 4;
        grid-column: 1 / -1;
        grid-row: 2;
        width: 100%;
        justify-content: flex-start;
        margin-top: var(--spacing-sm);
        position: relative;
    }
    
    .header-actions {
        grid-area: search;
        justify-self: end;
        gap: var(--spacing-xs);
    }
    
    /* Hide CTA button on mobile */
    .header-actions .header-cta-button {
        display: none;
    }
    
    /* Only show search toggle on mobile */
    .header-actions > *:not(.search-toggle-btn):not(.gtranslate-wrapper) {
        display: none;
    }
    
    /* Mobile menu toggle - Updated for new component */
    .header-menu-toggle {
        grid-area: menu;
        justify-self: end;
        display: flex;
    }
    
    .mobile-menu-toggle-container {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .menu-toggle-btn,
    .mobile-menu-toggle {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 44px;
        height: 44px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: var(--spacing-xs);
        border-radius: var(--radius-sm);
        transition: all var(--transition-normal);
        position: relative;
    }
    
    .menu-toggle-btn:hover,
    .mobile-menu-toggle:hover {
        background: rgba(99, 102, 241, 0.1);
        transform: scale(1.05);
    }
    
    .menu-toggle-btn:focus,
    .mobile-menu-toggle:focus {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }
    
    .menu-toggle-icon {
        display: flex;
        flex-direction: column;
        width: 24px;
        height: 18px;
        position: relative;
    }
    
    .hamburger-line {
        display: block;
        width: 100%;
        height: 2px;
        background: var(--text-primary);
        border-radius: 1px;
        transition: all var(--transition-normal) cubic-bezier(0.68, -0.55, 0.265, 1.55);
        transform-origin: center;
    }
    
    .hamburger-line:not(:last-child) {
        margin-bottom: 4px;
    }
    
    /* Animation states */
    .menu-toggle-btn[aria-expanded="true"] .hamburger-line-1,
    .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1),
    .menu-toggle-btn.active .hamburger-line-1,
    .mobile-menu-toggle.active .hamburger-line:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
    }
    
    .menu-toggle-btn[aria-expanded="true"] .hamburger-line-2,
    .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2),
    .menu-toggle-btn.active .hamburger-line-2,
    .mobile-menu-toggle.active .hamburger-line:nth-child(2) {
        opacity: 0;
        transform: scaleX(0);
    }
    
    .menu-toggle-btn[aria-expanded="true"] .hamburger-line-3,
    .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3),
    .menu-toggle-btn.active .hamburger-line-3,
    .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }
    
    /* Screen reader text */
    .menu-toggle-text.screen-reader-text {
        position: absolute;
        left: -9999px;
        width: 1px;
        height: 1px;
        overflow: hidden;
    }
    
    /* Hide main navigation by default on mobile */
    .main-navigation {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        box-shadow: var(--shadow-xl);
        z-index: 1000;
        border-top: 1px solid var(--bg-tertiary);
        border-radius: 0 0 var(--radius-md) var(--radius-md);
        overflow: hidden;
        opacity: 0;
        transform: translateY(-10px);
        transition: all var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .main-navigation.is-open,
    .main-navigation.mobile-menu-active,
    .main-navigation.menu-open {
        display: block;
        opacity: 1;
        transform: translateY(0);
    }
    
    .main-navigation .nav-menu-wrapper {
        flex-direction: column;
        gap: 0;
        padding: 0;
    }
    
    .main-navigation ul {
        flex-direction: column;
        padding: 0;
        gap: 0;
        width: 100%;
        margin: 0;
    }
    
    .main-navigation ul li {
        border-bottom: 1px solid var(--bg-tertiary);
        width: 100%;
    }
    
    .main-navigation ul li:last-child {
        border-bottom: none;
    }
    
    .main-navigation a {
        display: block;
        padding: var(--spacing-sm) var(--spacing-md);
        text-align: left;
        color: var(--text-primary);
        text-decoration: none;
        transition: all var(--transition-normal);
        font-weight: 500;
    }
    
    .main-navigation a:hover,
    .main-navigation a:focus {
        background: var(--bg-secondary);
        color: var(--primary-color);
        padding-left: var(--spacing-lg);
    }
    
    /* Language switcher mobile styles */
    .header-language-switcher {
        padding: var(--spacing-sm) var(--spacing-md);
        border-top: 1px solid var(--bg-tertiary);
        display: flex;
        justify-content: center;
    }
    
    .header-language-switcher .language-name {
        display: none;
    }
    
    /* Search overlay mobile adjustments */
    .header-search-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 9999;
        display: flex;
        align-items: flex-start;
        padding-top: 80px;
    }
    
    .search-overlay-content {
        background: var(--bg-primary);
        width: 100%;
        border-radius: 0;
        box-shadow: none;
        margin: 0;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 var(--spacing-sm);
    }
    
    .header-row {
        gap: var(--spacing-xs);
    }
    
    .site-logo-img {
        max-height: 35px;
    }
    
    .logo-text {
        font-size: var(--text-lg);
    }
    
    .mobile-menu-toggle {
        width: 35px;
        height: 35px;
        padding: var(--spacing-xs);
    }
    
    .mobile-menu-toggle .hamburger-line {
        width: 20px;
        height: 2px;
        margin: 2px 0;
    }
    
    .main-navigation a {
        padding: var(--spacing-sm) var(--spacing-sm);
        font-size: var(--text-sm);
    }
    
    .header-search-overlay {
        padding-top: 70px;
    }
    
    .search-overlay-content {
        padding: 1rem;
    }
}

/* Footer Responsive Styles */
@media (max-width: 768px) {
    .footer-menu-sections {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--spacing-xl);
    }
    
    .footer-section {
        text-align: center;
        margin-bottom: var(--spacing-lg);
    }
    
    .footer-link:before {
        display: none;
    }
    
    .footer-link:hover {
        transform: none;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .footer-copyright p {
        font-size: var(--text-xs);
    }
}

@media (max-width: 480px) {
    .footer-menu-sections {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-section-title {
        font-size: var(--text-base);
        margin-bottom: var(--spacing-sm);
    }
    
    .footer-link {
        font-size: var(--text-sm);
    }
}

/* Mobile Menu Styles */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--spacing-sm);
    cursor: pointer;
    flex-direction: column;
    gap: 3px;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.mobile-menu-toggle .hamburger-line {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
    transform-origin: center;
    display: block;
}

.mobile-menu-toggle.active .hamburger-line:first-child,
.mobile-menu-toggle.is-active .hamburger-line:first-child {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2),
.mobile-menu-toggle.is-active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:last-child,
.mobile-menu-toggle.is-active .hamburger-line:last-child {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Message Notifications */
.message-notification {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    max-width: 400px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    animation: slideInRight var(--transition-normal) ease;
}

.message-notification.message-success {
    border-left: 4px solid var(--accent-green);
    background: var(--bg-secondary);
}

.message-notification.message-error {
    border-left: 4px solid var(--accent-red);
    background: var(--bg-secondary);
}

.message-notification p {
    margin: 0;
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
}

.message-close {
    background: none;
    border: none;
    font-size: var(--text-lg);
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background var(--transition-normal);
    flex-shrink: 0;
}

.message-close:hover {
    background: rgba(0,0,0,0.1);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Animation Classes */
.mission-card,
.testimonial-card,
.stat-item,
.benefit-item {
    opacity: 1;
    transform: none;
    transition: all var(--transition-slow);
}

.mission-card.animate-in,
.testimonial-card.animate-in,
.stat-item.animate-in,
.benefit-item.animate-in,
.mission-card.in-view,
.testimonial-card.in-view,
.stat-item.in-view,
.benefit-item.in-view {
    opacity: 1;
    transform: none;
}

/* Loading Animation */
body:not(.loaded) {
    overflow: hidden;
}

body:not(.loaded)::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

body:not(.loaded)::after {
    content: '';
    position: fixed;
    top: 50%;
    left: 50%;
    width: 50px;
    height: 50px;
    margin: -25px 0 0 -25px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 10000;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design Enhancements */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .culture-content {
        gap: 40px;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
}

@media (max-width: 768px) {
    /* Mobile menu */
    .mobile-menu-toggle {
        display: flex;
        order: 3;
    }
    
    .main-navigation {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        transform: translateY(-10px);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 1000;
    }
    
    .main-navigation.mobile-active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-navigation ul {
        flex-direction: column;
        padding: 20px;
        gap: 0;
    }
    
    .main-navigation ul li {
        border-bottom: 1px solid var(--bg-tertiary);
    }
    
    .main-navigation ul li:last-child {
        border-bottom: none;
    }
    
    .main-navigation a {
        display: block;
        padding: 15px 0;
        text-align: center;
    }
    
    .cta-button {
        order: 2;
        margin-left: auto;
    }
    
    body.menu-open {
        overflow: hidden;
    }
    
    /* Hero adjustments */
    .hero-section {
        padding: 60px 0;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
    }
    
    .hero-image {
        display: none;
    }
    
    /* Stats grid */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    /* Mission grid */
    .mission-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .mission-card {
        padding: 30px 25px;
    }
    
    /* Culture section */
    .culture-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }
    
    .culture-text {
        padding-right: 0;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    /* CTA Form */
    .cta-form {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }
    
    .cta-input {
        width: 100%;
        max-width: 350px;
        min-width: auto;
    }
    
    .cta-submit {
        width: 100%;
        max-width: 250px;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    /* Comments */
    .comment {
        padding: 20px;
    }
    
    .comment .children {
        margin-left: 0;
    }
    
    .comment-respond {
        padding: 25px;
    }
    
    /* Message notifications */
    .message-notification {
        left: 10px;
        right: 10px;
        top: 10px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .mission-card,
    .testimonial-card {
        padding: 25px 20px;
    }
    
    .benefit-item {
        flex-direction: column;
        text-align: center;
    }
    
    .benefit-icon {
        align-self: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
        text-align: center;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .search-form {
        margin: 0 10px;
    }
}

@media (max-width: 375px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .mission-icon,
    .benefit-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
}

/* High DPI / Retina displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .site-logo::before {
        font-size: 32px;
    }
}

/* Landscape orientation on mobile */
@media (max-width: 768px) and (orientation: landscape) {
    .hero-section {
        padding: 40px 0;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
}

/* Print styles */
@media print {
    .site-header,
    .cta-section,
    .mobile-menu-toggle,
    .message-notification {
        display: none;
    }
    
    .site-main {
        margin-top: 0;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
        color: black;
        background: white;
    }
}

/* Dark mode support (if enabled by user) */
@media (prefers-color-scheme: dark) {
    /* This would be implemented if dark mode is desired */
    /* Currently maintaining light theme as per original design */
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .hero-image {
        transform: none !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .mission-card,
    .testimonial-card,
    .comment {
        border: 2px solid var(--text-primary);
    }
    
    .cta-button {
        border: 2px solid var(--text-light);
    }
}