* {
    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: #333;
}

.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: #f8f9fa;
    border-right: 1px solid #e0e0e0;
    padding: 2rem 1.5rem;
    overflow-y: auto;
    position: fixed;
    height: 100vh;
}

.sidebar h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

.sidebar h2 {
    font-size: 0.875rem;
    text-transform: uppercase;
    color: #6c757d;
    margin: 1.5rem 0 0.75rem 0;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.sidebar nav ul {
    list-style: none;
}

.sidebar nav ul ul {
    margin-left: 1rem;
    margin-top: 0.5rem;
}

.sidebar nav li {
    margin: 0.25rem 0;
}

.sidebar .folder {
    display: block;
    padding: 0.5rem 0.75rem;
    color: #495057;
    font-weight: 500;
    cursor: default;
}

.sidebar a {
    display: block;
    padding: 0.5rem 0.75rem;
    color: #495057;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.sidebar a:hover {
    background-color: #e9ecef;
    color: #212529;
}

.sidebar a.active {
    background-color: #007bff;
    color: white;
}

/* Content Area */
.content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem 3rem;
    max-width: 1200px;
}

#content-area {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Content Styling */
#content-area h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

#content-area h2 {
    font-size: 2rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: #34495e;
}

#content-area h3 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: #34495e;
}

#content-area p {
    margin-bottom: 1rem;
}

#content-area img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 1rem 0;
}

#content-area code {
    background-color: #f4f4f4;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
}

#content-area pre {
    background-color: #f4f4f4;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin: 1rem 0;
}

#content-area pre code {
    background-color: transparent;
    padding: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
    }

    .content {
        margin-left: 0;
        padding: 1.5rem;
    }

    .container {
        flex-direction: column;
    }
}