:root {
    --primary-color: #ff2d20;
    --primary-dark: #d91e1a;
    --secondary-color: #6366f1;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    direction: ltr;
}

[dir="rtl"] body {
    direction: rtl;
    font-family: 'Vazir', 'Tahoma', Arial, sans-serif;
}

[dir="rtl"] body .content-text ul {
    padding-right: 2rem;
    padding-left: 0;
}

[dir="rtl"] body .info-section {
    border-right: 4px solid var(--secondary-color);
    border-left: none;
}

[dir="rtl"] body .info-section li {
    padding-right: 1.5rem;
    padding-left: 0;
}

[dir="rtl"] body .info-section li:before {
    right: 0;
    left: auto;
}

[dir="rtl"] body .example-block {
    border-right: 4px solid var(--primary-color);
    border-left: none;
}

[dir="rtl"] body .use-cases-section {
    border-right-color: #10b981;
}

[dir="rtl"] body .common-mistakes-section {
    border-right-color: #ef4444;
}

[dir="rtl"] body .best-practices-section {
    border-right-color: #3b82f6;
}

[dir="rtl"] body .edge-cases-section {
    border-right-color: #f59e0b;
}

[dir="rtl"] body .performance-notes-section {
    border-right-color: #8b5cf6;
}

[dir="rtl"] body .security-notes-section {
    border-right-color: #ec4899;
}

[dir="rtl"] body .interview-points-section {
    border-right-color: #06b6d4;
}

[dir="rtl"] body .related-patterns-section {
    border-right-color: #14b8a6;
}

[dir="rtl"] body .version-notes-section {
    border-right-color: #6366f1;
}

pre, code, .example-block pre, .example-block code {
    direction: ltr;
    text-align: left;
}

[dir="rtl"] body pre,
[dir="rtl"] body code,
[dir="rtl"] body .example-block pre,
[dir="rtl"] body .example-block code,
[dir="rtl"] body .content-text code {
    direction: ltr;
    text-align: left;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo a {
    text-decoration: none;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.main-nav {
    display: flex;
    align-items: center;
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-switcher a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: var(--transition);
    font-weight: 500;
}

.lang-switcher a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.lang-switcher a.active {
    background: var(--primary-color);
    color: white;
}

.lang-switcher .separator {
    color: var(--text-secondary);
}

.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

.breadcrumbs {
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.breadcrumbs a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.breadcrumbs .separator {
    margin: 0 0.5rem;
    color: var(--text-secondary);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.search-box {
    margin-bottom: 2rem;
}

.search-input {
    width: 100%;
    max-width: 500px;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 45, 32, 0.1);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.category-card {
    display: block;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: var(--text-primary);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: inherit;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.topic-card {
    display: block;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-primary);
    cursor: pointer;
}

.topic-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.topic-card h3 {
    margin-bottom: 0.75rem;
    color: inherit;
    font-size: 1.25rem;
}

.topic-card h3 a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.topic-card:hover h3 a {
    color: inherit;
}

.topic-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.topic-content {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

.topic-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.topic-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.topic-intro {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.diagram-container {
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    overflow-x: auto;
}

.content-body {
    margin-top: 2rem;
}

.content-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.examples-section {
    margin-top: 3rem;
}

.examples-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.example-block {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary-color);
}

.example-block h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.example-block pre {
    background: #1e1e1e;
    border-radius: var(--radius);
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1rem 0;
    direction: ltr;
    text-align: left;
    max-width: 100%;
    word-break: keep-all;
    -webkit-overflow-scrolling: touch;
    white-space: pre;
}

pre {
    overflow-x: auto;
    max-width: 100%;
    word-break: keep-all;
    -webkit-overflow-scrolling: touch;
    white-space: pre;
}

.example-block code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.example-explanation {
    margin-top: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.related-topics {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.related-topics h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.related-topics ul {
    list-style: none;
}

.related-topics li {
    margin-bottom: 0.5rem;
}

.related-topics a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.1rem;
}

.related-topics a:hover {
    text-decoration: underline;
}

.search-results {
    margin-top: 2rem;
}

.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.content-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.content-text h1,
.content-text h2,
.content-text h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content-text h1 {
    font-size: 2rem;
}

.content-text h2 {
    font-size: 1.75rem;
}

.content-text h3 {
    font-size: 1.5rem;
}

.content-text strong {
    font-weight: 700;
    color: var(--text-primary);
}

.content-text em {
    font-style: italic;
}

.content-text code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--primary-color);
    direction: ltr;
    text-align: left;
    display: inline-block;
}

.content-text ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.content-text li {
    margin-bottom: 0.5rem;
}

.info-section {
    margin-top: 3rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border-left: 4px solid var(--secondary-color);
}

.info-section h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.info-section li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.7;
    color: var(--text-primary);
}

.info-section li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.info-section li:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.use-cases-section {
    border-left-color: #10b981;
}

.common-mistakes-section {
    border-left-color: #ef4444;
}

.best-practices-section {
    border-left-color: #3b82f6;
}

.edge-cases-section {
    border-left-color: #f59e0b;
}

.performance-notes-section {
    border-left-color: #8b5cf6;
}

.security-notes-section {
    border-left-color: #ec4899;
}

.interview-points-section {
    border-left-color: #06b6d4;
}

.related-patterns-section {
    border-left-color: #14b8a6;
}

.version-notes-section {
    border-left-color: #6366f1;
}

.topic-navigation {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.nav-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-buttons-group {
    display: flex;
    gap: 1rem;
}

.nav-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
    font-size: 1rem;
}

.nav-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-button-back {
    background: var(--text-secondary);
}

.nav-button-back:hover {
    background: var(--text-primary);
}

.nav-button-prev,
.nav-button-next {
    min-width: 150px;
    text-align: center;
}

[dir="rtl"] body .nav-button-prev {
    text-align: left;
}

[dir="rtl"] body .nav-button-next {
    text-align: right;
}

.site-footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
    }

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

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

    .topic-content {
        padding: 1.5rem;
    }

    .topic-header h1 {
        font-size: 2rem;
    }

    .nav-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-buttons-group {
        flex-direction: column;
        width: 100%;
    }

    .nav-button {
        width: 100%;
        text-align: center;
    }

    .info-section {
        padding: 1rem;
    }

    .info-section h2 {
        font-size: 1.5rem;
    }

    .example-block pre,
    pre {
        font-size: 0.8rem;
        padding: 1rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
        word-break: keep-all;
        white-space: pre;
        display: block;
        width: 100%;
        box-sizing: border-box;
    }

    .example-block code,
    code {
        font-size: 0.8rem;
        word-break: keep-all;
        white-space: pre;
    }

    .content-text code {
        font-size: 0.85em;
        word-break: keep-all;
        white-space: pre;
        overflow-x: auto;
        display: inline-block;
        max-width: 100%;
    }

    .diagram-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding: 1rem;
    }

    .container {
        padding: 0 15px;
    }
}