:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --accent-primary: #10b981;
    --accent-secondary: #059669;
    --border-color: #e2e8f0;
    --code-bg: #1e293b;
    --code-text: #f1f5f9;
    --sidebar-bg: #f8fafc;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --accent-primary: #10b981;
    --accent-secondary: #34d399;
    --border-color: #334155;
    --code-bg: #020617;
    --code-text: #f1f5f9;
    --sidebar-bg: #1e293b;
}

* {
    font-family: 'Tajawal', sans-serif;
}

h1, h2, h3, h4, h5, h6, .heading-font {
    font-family: 'Cairo', sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.sidebar {
    background-color: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
}

.nav-link {
    color: var(--text-secondary);
    transition: all 0.3s ease;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    display: block;
    margin-bottom: 0.25rem;
    text-decoration: none;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--accent-primary);
    color: white;
}

.progress-bar {
    height: 6px;
    background-color: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transition: width 0.5s ease;
}

.lesson-content {
    color: var(--text-primary);
}

.content-section {
    margin-bottom: 3rem;
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.content-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--accent-primary);
}

.content-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content-section p {
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.content-section ul, .content-section ol {
    color: var(--text-secondary);
    line-height: 2;
    margin: 1rem 0;
    padding-right: 2rem;
}

.content-section li {
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}

.code-block {
    background-color: var(--code-bg);
    color: var(--code-text);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
    direction: ltr;
    text-align: left;
    line-height: 1.7;
    font-family: 'Courier New', monospace;
    border: 1px solid var(--border-color);
    margin: 1.5rem 0;
    font-size: 0.95rem;
    position: relative;
}

.prompt-box {
    background-color: var(--code-bg);
    color: var(--code-text);
    border-radius: 8px;
    padding: 1.25rem;
    font-family: 'Tajawal', sans-serif;
    direction: rtl;
    text-align: right;
    line-height: 1.8;
    border: 1px solid var(--border-color);
    white-space: pre-wrap;
    word-wrap: break-word;
    margin: 1.5rem 0;
}

.tip-box {
    background-color: var(--bg-tertiary);
    border-right: 4px solid var(--accent-primary);
    padding: 1.25rem 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
}

.tip-box.warning {
    border-right-color: #f59e0b;
}

.tip-box h3 {
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    font-size: 1.15rem;
}

.tip-box p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

.example-box {
    background-color: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
    border: 2px solid var(--accent-primary);
}

.example-box h3 {
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.example-box ul {
    list-style: none;
    padding: 0;
}

.example-box li {
    margin-bottom: 1rem;
    padding-right: 0;
}

.summary-box {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    padding: 2rem;
    border-radius: 12px;
    color: white;
}

.summary-box ul {
    list-style: none;
    padding: 0;
}

.summary-box li {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 500;
}

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

.feature-card {
    background-color: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.15);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.use-case-card {
    background-color: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
}

.use-case-card i {
    font-size: 2rem;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
}

.use-case-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    margin-top: 0;
    color: var(--text-primary);
}

.use-case-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

.companies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.company-card {
    background-color: var(--bg-tertiary);
    padding: 1.25rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.company-card strong {
    display: block;
    font-size: 1.2rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.company-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.lesson-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.nav-btn {
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.nav-btn:hover {
    background-color: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
}

.btn-primary:hover {
    background-color: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.3);
}

.highlight {
    background-color: var(--accent-primary);
    color: white;
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        right: -100%;
        top: 0;
        height: 100vh;
        width: 280px;
        z-index: 999;
        transition: right 0.3s ease;
    }
    
    .sidebar.open {
        right: 0;
    }
    
    .overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 998;
    }
    
    .overlay.active {
        display: block;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .lesson-navigation {
        flex-direction: column;
    }
    
    .nav-btn, .btn-primary {
        width: 100%;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
}

.command-box {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    direction: ltr;
    text-align: left;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
    position: relative;
}

.command-box::before {
    content: '$ ';
    color: var(--accent-primary);
    font-weight: bold;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    overflow: hidden;
}

table th {
    background-color: var(--accent-primary);
    color: white;
    padding: 1rem;
    text-align: right;
    font-weight: 600;
}

table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

table tr:last-child td {
    border-bottom: none;
}

table tr:hover {
    background-color: var(--bg-secondary);
}