.lesson-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.lesson-content h2,
.lesson-content h3,
.lesson-content h4 {
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

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

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

.lesson-content p {
    margin-bottom: 1rem;
}

.lesson-content a {
    color: #0d6efd;
}

.lesson-content code {
    background-color: #f8f9fa;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
}

.lesson-content pre {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
    margin: 1rem 0;
}

.lesson-content blockquote {
    border-left: 4px solid #0d6efd;
    padding-left: 1rem;
    margin: 1.5rem 0;
    color: #666;
}

.lesson-content table {
    margin: 1rem 0;
    width: 100%;
}

.lesson-content table tr {
    border-bottom: 1px solid #e0e0e0;
}

.lesson-content table th,
.lesson-content table td {
    padding: 0.75rem;
    text-align: left;
}

.lesson-content table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.list-group-item.active {
    background-color: #0d6efd;
    border-color: #0d6efd;
}

@media (max-width: 991.98px) {
    .sidebar {
        display: none;
    }
}