@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
    }
    
    .hero-title {
        font-size: var(--font-size-6xl);
    }
    
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}


@media (max-width: 1199px) {
    .hero-title {
        font-size: 4rem;
    }
    
    .article-layout {
        grid-template-columns: 250px 1fr;
        gap: var(--spacing-8);
    }
}


@media (max-width: 991px) {
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        gap: 0;
        padding: 2rem;
        transition: all 0.3s ease;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        z-index: 1000;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
        flex-direction: column;
        cursor: pointer;
        gap: 4px;
        padding: 0.5rem;
        border-radius: 4px;
        transition: all 0.3s ease;
    }
    
    .nav-toggle:hover {
        background: rgba(59, 130, 246, 0.1);
    }
    
    .nav-toggle span {
        display: block;
        width: 25px;
        height: 3px;
        background: #1f2937;
        transition: all 0.3s ease;
        border-radius: 2px;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
        background: var(--primary-color);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
        background: var(--primary-color);
    }
    
    .nav-link {
        padding: 1rem 0;
        border-bottom: 1px solid #e5e7eb;
        width: 100%;
        display: block;
        color: #1f2937;
        text-decoration: none;
        font-size: 1.1rem;
        font-weight: 500;
        transition: all 0.3s ease;
    }
    
    .nav-link:hover {
        background: #f8fafc;
        color: var(--primary-color);
        padding-left: 1rem;
        border-radius: 8px;
    }
    
    .nav-link.auth-link {
        color: var(--primary-color);
        font-weight: 600;
    }
    
    .nav-link.btn-register {
        background: var(--primary-color) !important;
        color: white !important;
        border-radius: 8px !important;
        margin: 1rem 0 !important;
        padding: 1rem !important;
        text-align: center !important;
        border-bottom: none !important;
        display: block !important;
    }
    
    .nav-link.btn-register:hover {
        background: var(--secondary-color) !important;
        color: white !important;
        padding: 1rem !important;
        padding-left: 1rem !important;
    }
    
    .nav-dropdown {
        position: static;
    }
    
    .dropdown-content {
        position: static !important;
        display: none;
        opacity: 1 !important;
        visibility: visible !important;
        transform: none !important;
        box-shadow: none !important;
        border: none !important;
        background: #f8fafc !important;
        margin-top: 0.5rem !important;
        border-radius: 8px !important;
        padding: 0.5rem !important;
    }
    
    .dropdown-content.active {
        display: block !important;
    }
    
    .dropdown-content a {
        display: block !important;
        padding: 0.75rem 1rem !important;
        color: #374151 !important;
        text-decoration: none !important;
        border-radius: 4px !important;
        margin-bottom: 0.25rem !important;
        transition: all 0.3s ease !important;
    }
    
    .dropdown-content a:hover {
        background: white !important;
        color: var(--primary-color) !important;
    }
    
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-6);
    }
    
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-6);
    }
    
    
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .article-card.featured {
        grid-column: span 2;
    }
    
    
    .newsletter-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
        text-align: center;
    }
    
    .newsletter-form {
        justify-content: center;
    }
    
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-8);
    }
    
    
    .article-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }
    
    .article-sidebar {
        position: static;
        order: 2;
    }
    
    .table-of-contents {
        display: none;
    }
    
    
    .contact-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-12);
    }
    
    
    .search-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .search-filters select {
        width: 100%;
        max-width: 250px;
    }
    
    
    .filter-controls {
        flex-direction: column;
        gap: var(--spacing-4);
    }
    
    .filter-controls select {
        width: 100%;
    }
}


@media (max-width: 991px) {
    .nav-toggle {
        display: flex !important;
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-menu.active {
        display: flex !important;
    }
    
    
    .nav-menu .nav-link {
        display: block !important;
        visibility: visible !important;
    }
}


@media (max-width: 767px) {
    
    .container {
        padding: 0 var(--spacing-3);
    }
    
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
    
    
    .hero {
        min-height: 80vh;
        padding: var(--spacing-16) 0;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-4);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-6);
    }
    
    .hero-buttons {
        gap: var(--spacing-3);
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .stat-number {
        font-size: var(--font-size-3xl);
    }
    
    
    .page-header {
        padding: var(--spacing-16) 0 var(--spacing-12);
    }
    
    
    .categories-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    .category-card {
        padding: var(--spacing-6);
    }
    
    .category-icon {
        width: 60px;
        height: 60px;
        font-size: var(--font-size-2xl);
    }
    
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .article-card.featured {
        grid-column: span 1;
    }
    
    .article-card.featured .article-image {
        height: 200px;
    }
    
    .articles-container {
        grid-template-columns: 1fr;
    }
    
    
    .filter-tabs {
        justify-content: flex-start;
    }
    
    .filter-tab {
        font-size: var(--font-size-xs);
        padding: var(--spacing-2) var(--spacing-4);
    }
    
    
    .article-meta {
        flex-direction: column;
        gap: var(--spacing-3);
        align-items: flex-start;
    }
    
    .author-info {
        gap: var(--spacing-3);
    }
    
    .article-stats {
        gap: var(--spacing-4);
    }
    
    .article-actions {
        flex-wrap: wrap;
        gap: var(--spacing-2);
    }
    
    
    .newsletter-form {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .newsletter-form input {
        width: 100%;
    }
    
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .contact-method {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-3);
    }
    
    .method-icon {
        align-self: center;
    }
    
    
    .search-header h1 {
        font-size: var(--font-size-3xl);
    }
    
    .search-input-group input {
        padding: var(--spacing-3) var(--spacing-12) var(--spacing-3) var(--spacing-4);
        font-size: var(--font-size-base);
    }
    
    .search-btn-submit {
        padding: var(--spacing-2);
        right: var(--spacing-1);
    }
    
    .suggestion-tags {
        gap: var(--spacing-2);
    }
    
    .suggestion-tag {
        font-size: var(--font-size-xs);
        padding: var(--spacing-1) var(--spacing-3);
    }
    
    
    .quick-categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-4);
    }
    
    .quick-category {
        padding: var(--spacing-4);
    }
    
    .quick-category .category-icon {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-xl);
    }
    
    
    .featured-categories,
    .featured-articles,
    .newsletter {
        padding: var(--spacing-16) 0;
    }
    
    .articles-section {
        padding: var(--spacing-12) 0;
    }
    
    .contact-section {
        padding: var(--spacing-12) 0;
    }
    
    
    .btn {
        padding: var(--spacing-3) var(--spacing-5);
        font-size: var(--font-size-sm);
    }
    
    
    .section-header {
        margin-bottom: var(--spacing-12);
    }
    
    
    .article-content h2 {
        margin-top: var(--spacing-8);
        font-size: var(--font-size-xl);
    }
    
    .article-content h3 {
        margin-top: var(--spacing-6);
        font-size: var(--font-size-lg);
    }
    
    .callout-box,
    .pro-tip,
    .warning-box,
    .info-box {
        padding: var(--spacing-4);
        margin: var(--spacing-6) 0;
    }
}


@media (max-width: 575px) {
    
    .container {
        padding: 0 var(--spacing-2);
    }
    
    
    .nav-container {
        padding: 0 var(--spacing-3);
    }
    
    .nav-brand {
        font-size: var(--font-size-lg);
    }
    
    .nav-brand i {
        font-size: var(--font-size-xl);
    }
    
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-sm);
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 250px;
    }
    
    
    .page-header {
        padding: var(--spacing-12) 0 var(--spacing-8);
    }
    
    .page-header h1 {
        font-size: var(--font-size-2xl);
    }
    
    
    h1 { font-size: var(--font-size-2xl); }
    h2 { font-size: var(--font-size-xl); }
    h3 { font-size: var(--font-size-lg); }
    
    
    .category-card,
    .article-card {
        padding: var(--spacing-4);
    }
    
    .category-icon {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-4);
    }
    
    
    .quick-categories-grid {
        grid-template-columns: 1fr;
    }
    
    
    .search-header h1 {
        font-size: var(--font-size-2xl);
    }
    
    .search-header p {
        font-size: var(--font-size-base);
    }
    
    
    .contact-method {
        gap: var(--spacing-2);
    }
    
    .method-icon {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-lg);
    }
    
    .contact-form-container {
        padding: var(--spacing-6);
    }
    
    
    .article-actions {
        justify-content: center;
    }
    
    .action-btn {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-xs);
    }
    
    
    .filter-tabs {
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .filter-tabs::-webkit-scrollbar {
        display: none;
    }
    
    
    .social-links a {
        width: 35px;
        height: 35px;
        font-size: var(--font-size-sm);
    }
    
    
    .section-header {
        margin-bottom: var(--spacing-8);
    }
    
    .featured-categories,
    .featured-articles,
    .newsletter {
        padding: var(--spacing-12) 0;
    }
    
    .articles-section,
    .contact-section {
        padding: var(--spacing-8) 0;
    }
}


@media print {
    .navbar,
    .hero,
    .newsletter,
    .footer,
    .article-sidebar,
    .article-actions,
    .comments-section {
        display: none !important;
    }
    
    .article-content-section {
        padding: 0;
    }
    
    .article-layout {
        grid-template-columns: 1fr;
    }
    
    .container {
        max-width: none;
        padding: 0;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }
    
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
        color: #000;
    }
    
    p, li {
        orphans: 3;
        widows: 3;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
    
    .article-content img {
        max-width: 100% !important;
        height: auto !important;
    }
}


@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;
    }
}


@media (prefers-contrast: high) {
    .btn-primary {
        background: #000;
        color: #fff;
        border: 2px solid #fff;
    }
    
    .btn-secondary {
        background: #fff;
        color: #000;
        border: 2px solid #000;
    }
    
    .category-card,
    .article-card {
        border: 2px solid #000;
    }
    
    .nav-link.active::after {
        background: #000;
    }
}


*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:focus,
.nav-link:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}


.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}


.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}


@media (hover: none) and (pointer: coarse) {
    .btn,
    .nav-link,
    .category-card,
    .article-card {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .action-btn {
        min-height: 44px;
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .nav-toggle {
        min-height: 44px;
        min-width: 44px;
    }
}