/**
 * Documentation Hub Styles
 * Phase 13: Documentation Module
 */

/* ========== Variables ========== */
/* Используем стандартные переменные из variables.css */
/* Дополнительные переменные для документации */
:root {
    --doc-spacing: clamp(var(--spacing-md), 2vw, var(--spacing-lg));
    --doc-card-radius: var(--border-radius-lg);
    --doc-card-shadow: 0 2px 4px var(--shadow-sm), 0 4px 12px var(--shadow);
}

/* ========== Main Container ========== */
.documentation-hub {
    padding: clamp(var(--spacing-md), 2vw, var(--spacing-lg));
    max-width: min(1400px, 100% - clamp(1rem, 4vw, 2rem));
    margin: 0 auto;
    animation: fadeIn 0.3s ease-out;
    min-height: calc(100vh - 200px);
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    overflow-x: hidden;
    font-family: var(--font-family);
}

.documentation-header {
    margin-bottom: var(--doc-spacing);
}

.documentation-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--doc-spacing);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.documentation-header h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin: 0;
    color: var(--text-primary);
}

.documentation-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* ========== Tabs ========== */
.documentation-tabs {
    display: flex;
    gap: var(--spacing-sm);
    border-bottom: 2px solid var(--border);
    flex-wrap: wrap;
}

.tab-btn {
    padding: clamp(var(--spacing-sm), 1.5vw, var(--spacing-md)) clamp(var(--spacing-md), 3vw, var(--spacing-lg));
    border: none;
    background: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: clamp(0.875rem, 2vw, 1rem);
    transition: all var(--transition) cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
    will-change: transform, color, border-color;
    font-family: var(--font-family);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}

/* ========== Filters ========== */
.documentation-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--doc-spacing);
    flex-wrap: wrap;
}

.documentation-filters .input,
.documentation-filters .select {
    flex: 1;
    min-width: min(200px, 100%);
}

/* ========== Articles List ========== */
.articles-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
    gap: var(--doc-spacing);
    margin-bottom: var(--doc-spacing);
}

.article-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--doc-card-radius);
    padding: clamp(var(--spacing-md), 2vw, var(--spacing-lg));
    box-shadow: var(--doc-card-shadow);
    cursor: pointer;
    transition: all var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    animation: fadeInUp 0.3s ease-out;
    animation-fill-mode: both;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    will-change: transform, box-shadow, border-color;
    contain: layout style paint;
    position: relative;
    overflow: hidden;
}

.article-card:nth-child(1) { animation-delay: 0.05s; }
.article-card:nth-child(2) { animation-delay: 0.1s; }
.article-card:nth-child(3) { animation-delay: 0.15s; }
.article-card:nth-child(4) { animation-delay: 0.2s; }

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-sm), 0 8px 24px var(--shadow-md);
    border-color: var(--primary);
}

.article-card:active {
    transform: translateY(0);
    box-shadow: var(--doc-card-shadow);
    border-color: var(--border);
}

.article-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.article-card-header h3 {
    font-size: clamp(1.125rem, 3vw, 1.25rem);
    margin: 0;
    color: var(--text-primary);
    flex: 1;
}

.article-category {
    flex-shrink: 0;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: clamp(0.875rem, 2vw, 1rem);
    line-height: 1.6;
    margin: 0;
    flex: 1;
}

.article-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--text-disabled);
    font-size: clamp(0.75rem, 1.5vw, 0.875rem);
    flex-wrap: wrap;
}

.article-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    padding: calc(var(--spacing-xs) * 0.5) var(--spacing-xs);
    background: var(--surface-hover);
    border-radius: 12px;
    font-size: clamp(0.75rem, 1.5vw, 0.875rem);
    color: var(--text-secondary);
}

/* ========== Documentation Content Container ========== */
.documentation-content {
    max-height: calc(100vh - 400px);
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-xs);
    min-height: 300px;
}

/* ========== Article Viewer ========== */
.article-viewer {
    background: var(--surface);
    border-radius: var(--doc-card-radius);
    padding: var(--doc-spacing);
    box-shadow: var(--doc-card-shadow);
    animation: fadeIn 0.3s ease-out;
    max-height: calc(100vh - 400px);
    overflow-y: auto;
    overflow-x: hidden;
}

.article-viewer-header {
    display: flex;
    align-items: flex-start;
    gap: var(--doc-spacing);
    margin-bottom: var(--doc-spacing);
    flex-wrap: wrap;
}

.article-viewer-header h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin: 0;
    flex: 1;
    color: var(--text-primary);
}

.article-content {
    padding: clamp(var(--spacing-md), 2vw, var(--spacing-lg));
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    line-height: 1.8;
    color: var(--text-primary);
    margin-top: var(--spacing-md);
    max-height: calc(100vh - 500px);
    overflow-y: auto;
    overflow-x: hidden;
}

.article-content h1,
.article-content h2,
.article-content h3 {
    margin-top: var(--doc-spacing);
    margin-bottom: calc(var(--doc-spacing) * 0.5);
    color: var(--text-primary);
}

.article-content h1 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
}

.article-content h2 {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
}

.article-content h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
}

.article-content p {
    margin-bottom: calc(var(--doc-spacing) * 0.5);
}

.article-content code {
    background: var(--surface);
    padding: 0.125rem 0.25rem;
    border-radius: 4px;
    font-family: var(--font-mono, 'Courier New', monospace);
    font-size: 0.875em;
    color: var(--primary);
}

.article-content pre {
    background: var(--surface);
    padding: var(--doc-spacing);
    border-radius: 8px;
    overflow-x: auto;
    margin: var(--doc-spacing) 0;
}

.article-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.article-content a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px solid var(--primary);
    transition: color 0.2s ease;
}

.article-content a:hover {
    color: var(--primary-dark, var(--primary));
    border-bottom-color: var(--primary-dark, var(--primary));
}

/* ========== Badges ========== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-api {
    background: linear-gradient(135deg, var(--info, #3498db) 0%, #2980b9 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(41, 128, 185, 0.3);
}

.badge-module {
    background: linear-gradient(135deg, var(--success, #2ecc71) 0%, #27ae60 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(46, 204, 113, 0.3);
}

.badge-guide {
    background: linear-gradient(135deg, var(--warning, #f39c12) 0%, #f39c12 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(243, 156, 18, 0.3);
}

.badge-tutorial {
    background: linear-gradient(135deg, var(--accent, #3498db) 0%, #3498db 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(52, 152, 219, 0.3);
}

/* ========== Pagination ========== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--doc-spacing);
    padding: var(--spacing-md);
}

.pagination-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 44px;
    touch-action: manipulation;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.pagination-btn:hover:not(:disabled) {
    background: var(--surface-hover);
    border-color: var(--primary);
    color: var(--primary);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    color: var(--text-secondary);
    font-size: clamp(0.875rem, 2vw, 1rem);
}

/* ========== Skeleton ========== */
.skeleton-container {
    padding: var(--doc-spacing);
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--surface) 0%,
        var(--surface-hover) 50%,
        var(--surface) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 4px;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
}

.skeleton-text:last-child {
    width: 60%;
}

/* ========== Error State ========== */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    min-height: 300px;
    color: var(--error, #e74c3c);
}

.error-state i {
    font-size: 4rem;
    opacity: 0.5;
}

.error-state h3 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin: 0;
    color: var(--text-primary);
}

.error-state p {
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0;
}

/* ========== Animations ========== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Float animation for empty state icons */
@keyframes float {
    0%, 100% { 
        transform: translateY(0); 
    }
    50% { 
        transform: translateY(-10px); 
    }
}

/* ========== Empty State ========== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    min-height: 300px;
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--text-disabled);
    opacity: 0.5;
    animation: float 3s ease-in-out infinite;
}

.empty-state-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.empty-state-description {
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0;
    line-height: 1.6;
}

.empty-state-action {
    margin-top: var(--spacing-md);
}

/* ========== Mobile Adaptivity ========== */
/* Mobile (default, до 480px) */
.documentation-hub {
    padding: clamp(0.75rem, 2vw, 1rem);
}

/* Small tablets (480px+) */
@media (min-width: 480px) {
    .documentation-hub {
        padding: clamp(1rem, 2vw, 1.25rem);
    }
}

/* Tablets (768px+) */
@media (min-width: 768px) {
    .documentation-hub {
        padding: clamp(1.25rem, 2.5vw, 1.5rem);
    }
    
    .documentation-header-top {
        flex-direction: row;
        align-items: center;
    }
    
    .documentation-actions {
        width: auto;
        justify-content: flex-end;
    }
    
    .documentation-actions .btn {
        flex: none;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .articles-list {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
}

/* Large desktop (1440px+) */
@media (min-width: 1440px) {
    .articles-list {
        grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    }
}

/* Mobile specific (max-width: 768px) */
@media (max-width: 768px) {
    .documentation-header-top {
        flex-direction: column;
        align-items: stretch;
    }
    
    .documentation-actions {
        width: 100%;
        justify-content: stretch;
    }
    
    .documentation-actions .btn {
        flex: 1;
    }
    
    .articles-list {
        grid-template-columns: 1fr;
    }
    
    .article-card-footer {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .article-viewer-header {
        flex-direction: column;
    }
    
    .article-viewer-header h1 {
        font-size: clamp(1.25rem, 4vw, 1.75rem);
    }
}

/* ========== High Contrast Theme ========== */
[data-theme="high-contrast"] .article-card {
    border: 2px solid var(--border);
}

[data-theme="high-contrast"] .article-card:hover {
    border-color: var(--accent);
}

[data-theme="high-contrast"] .article-content {
    border: 1px solid var(--border);
}

[data-theme="high-contrast"] .tab-btn.active {
    border-bottom-width: 3px;
}

[data-theme="high-contrast"] .badge {
    border: 1px solid currentColor;
}

/* ========== Source Badge ========== */
.source-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.source-badge i {
    color: var(--primary);
}

/* ========== Diagrams ========== */
.diagrams-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
    gap: var(--doc-spacing);
    animation: fadeInUp 0.3s ease-out;
}

.diagram-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--doc-card-radius);
    padding: clamp(var(--spacing-md), 2vw, var(--spacing-lg));
    cursor: pointer;
    transition: all var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--doc-card-shadow);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    will-change: transform, box-shadow, border-color;
    contain: layout style paint;
    animation: fadeInUp 0.3s ease-out;
    animation-fill-mode: both;
    overflow: hidden;
}

.diagram-card:nth-child(1) { animation-delay: 0.05s; }
.diagram-card:nth-child(2) { animation-delay: 0.1s; }
.diagram-card:nth-child(3) { animation-delay: 0.15s; }
.diagram-card:nth-child(4) { animation-delay: 0.2s; }

.diagram-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-sm), 0 8px 24px var(--shadow-md);
    border-color: var(--primary);
}

.diagram-card:active {
    transform: translateY(0);
    box-shadow: var(--doc-card-shadow);
}

.diagram-card-preview {
    width: 100%;
    height: clamp(150px, 20vh, 200px);
    background: var(--background);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-light);
    position: relative;
}

.diagram-card-preview svg {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    display: block;
    object-fit: contain;
}

.diagram-card-preview .diagram-svg-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.diagram-card-preview .diagram-svg-container svg {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
}

.diagram-fallback-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0.8;
}

.diagram-card-preview i {
    opacity: 0.3;
}

.diagram-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.diagram-card-header h3 {
    margin: 0;
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    color: var(--text-primary);
    flex: 1;
    font-weight: 600;
    line-height: 1.4;
}

.diagram-type {
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.diagram-description {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

.diagram-card-footer {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.diagram-card-footer span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.diagram-card-footer i {
    color: var(--text-disabled);
}

/* ========== Mobile Optimizations ========== */
@media (max-width: 768px) {
    .documentation-hub {
        padding: var(--mobile-spacing-md);
        max-width: 100%;
        min-height: auto;
        max-height: none;
    }

    .documentation-header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--mobile-spacing-md);
    }

    .documentation-header h1 {
        font-size: var(--mobile-font-size-xl);
        width: 100%;
    }

    .documentation-actions {
        width: 100%;
        display: flex;
        gap: var(--mobile-spacing-sm);
    }

    .documentation-actions .btn {
        flex: 1;
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-sm);
    }

    /* Tabs */
    .documentation-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
        flex-wrap: nowrap;
        gap: 0;
    }

    .documentation-tabs::-webkit-scrollbar {
        display: none;
    }

    .tab-btn {
        min-width: auto;
        white-space: nowrap;
        padding: var(--mobile-spacing-md) var(--mobile-spacing-lg);
        font-size: var(--mobile-font-size-sm);
        min-height: var(--touch-target-min);
    }

    /* Filters */
    .documentation-filters {
        flex-direction: column;
        gap: var(--mobile-spacing-sm);
    }

    .documentation-filters .input,
    .documentation-filters .select {
        width: 100%;
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-base);
    }

    /* Articles */
    .articles-list {
        grid-template-columns: 1fr;
        gap: var(--mobile-spacing-md);
    }

    .article-card {
        padding: var(--mobile-spacing-md);
        min-height: var(--touch-target-comfortable);
    }

    .article-card-header {
        flex-direction: column;
        gap: var(--mobile-spacing-sm);
    }

    .article-card-header h3 {
        font-size: var(--mobile-font-size-base);
        width: 100%;
        word-wrap: break-word;
        overflow-wrap: break-word;
        word-break: break-word;
        max-width: 100%;
        min-width: 0;
    }

    .article-excerpt {
        font-size: var(--mobile-font-size-sm);
        word-wrap: break-word;
        overflow-wrap: break-word;
        word-break: break-word;
        max-width: 100%;
    }
    
    .article-card {
        max-width: 100%;
        overflow-x: hidden;
        word-wrap: break-word;
    }

    .article-card-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--mobile-spacing-sm);
        padding-top: var(--mobile-spacing-sm);
    }

    .article-meta {
        font-size: var(--mobile-font-size-xs);
        width: 100%;
    }

    .article-tags {
        width: 100%;
    }

    .tag {
        font-size: var(--mobile-font-size-xs);
    }

    /* Content */
    .documentation-content {
        max-height: none;
        padding: 0;
    }

    .article-viewer {
        padding: var(--mobile-spacing-md);
        max-height: none;
    }

    .article-viewer-header {
        flex-direction: column;
        gap: var(--mobile-spacing-md);
    }

    .article-viewer-header h1 {
        font-size: var(--mobile-font-size-lg);
        width: 100%;
    }

    .article-content {
        padding: var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-sm);
        line-height: 1.7;
        max-height: none;
    }

    .article-content h1 {
        font-size: var(--mobile-font-size-xl);
    }

    .article-content h2 {
        font-size: var(--mobile-font-size-lg);
    }

    .article-content h3 {
        font-size: var(--mobile-font-size-base);
    }

    /* Diagrams */
    .diagrams-list {
        grid-template-columns: 1fr;
        gap: var(--mobile-spacing-md);
    }
    
    .diagram-card {
        padding: var(--mobile-spacing-md);
    }

    .diagram-card-preview {
        height: clamp(120px, 20vh, 180px);
    }

    .diagram-card-header h3 {
        font-size: var(--mobile-font-size-base);
    }

    .diagram-description {
        font-size: var(--mobile-font-size-sm);
    }

    .diagram-card-footer {
        flex-direction: column;
        gap: var(--mobile-spacing-sm);
        font-size: var(--mobile-font-size-xs);
    }
}

@media (max-width: 480px) {
    .documentation-header-top {
        gap: var(--mobile-spacing-sm);
    }

    .documentation-actions {
        flex-direction: column;
    }

    .documentation-actions .btn {
        width: 100%;
    }

    .tab-btn {
        padding: var(--mobile-spacing-sm) var(--mobile-spacing-md);
    }
}