.pdf-viewer-preview-link {
    display: block;
    width: 100%;
    position: relative;
}

.pdfjs-preview {
    border: 1px solid black;
    display: block;
    width: 100%;
    height: auto;
    /* A4 dimensions: 210mm × 297mm at 96 DPI ≈ 793px × 1123px */
    max-width: 793px;
    aspect-ratio: 793 / 1123;
}

.pdf-viewer-preview-error {
    padding: 1rem;
}

/* Spinner styles */
.pdf-viewer-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-top-color: #333;
    border-radius: 50%;
    animation: pdf-viewer-spin 1s linear infinite;
    z-index: 10;
}

@keyframes pdf-viewer-spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}