body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

main {
    display: flex;
    flex: 1;
    padding: 1rem;
    gap: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.sidebar {
    flex: 0 0 250px;
    background-color: #fff;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

#file-selector {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.content-display {
    flex: 1;
    background-color: #fff;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    overflow-y: auto; /* Default scroll for content */
    display: flex;
    justify-content: center; /* Center content horizontally */
    align-items: flex-start; /* Align content to the top */
}

#viewer-container {
    width: 100%;
    height: 100%;
    /* Ensure content inside container can scroll if necessary */
    overflow: auto;
}

#viewer-container canvas {
    max-width: 100%;
    height: auto;
    display: block; /* Remove extra space below canvas */
    margin: 0 auto; /* Center PDF canvas */
}

#viewer-container img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto; /* Center images */
}

.markdown-body {
    max-width: 100%;
    padding: 1rem;
    box-sizing: border-box;
}

.markdown-body pre {
    background-color: #eee;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
}

.markdown-body code {
    font-family: 'Courier New', Courier, monospace;
}

/* Highlight.js specific overrides */
pre code.hljs {
    background: none; /* Let the parent <pre> handle the background */
    padding: 0;
    overflow-x: visible;
}


footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    margin-top: auto;
    box-shadow: 0 -2px 5px rgba(0,0,0,0.2);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    main {
        flex-direction: column;
        padding: 0.5rem;
    }

    .sidebar {
        flex: none;
        width: 100%;
        margin-bottom: 1rem;
    }

    .content-display {
        flex: none;
        width: 100%;
    }
}