.pdf-viewer-block {
    position: relative;
    margin: 1em 0;
    padding: 1em;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: #fff;
}

.pdf-viewer-title {
    margin: 0 0 0.5em;
    font-size: 1.2em;
    font-weight: 600;
}

.pdf-viewer-description {
    margin: 0 0 1em;
    color: #666;
}

.pdf-viewer-container {
    position: relative;
    width: 100%;
    margin-top: 1em;
}

.pdf-viewer-iframe {
    width: 100%;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: #fff;
}

.pdf-viewer-error {
    padding: 1em;
    margin: 1em 0;
    border: 1px solid #dc3545;
    border-radius: 4px;
    background: #fff;
    color: #dc3545;
}

.pdf-viewer-fallback {
    margin: 1em 0;
    padding: 1em;
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.pdf-viewer-fallback a {
    color: #007cba;
    text-decoration: none;
}

.pdf-viewer-fallback a:hover {
    text-decoration: underline;
}