:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 250px;
    background: #f8f9fa;
    padding: 2rem;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.main-content {
    margin-left: 250px;
    padding: 2rem;
}

.doc-section {
    margin-bottom: 2rem;
}

.doc-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.doc-section h3 {
    color: var(--secondary-color);
    margin-top: 1.5rem;
}

.code-block {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
}

.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

@media (max-width: 768px) {
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
    }
    .main-content {
        margin-left: 0;
    }
}