/* Merge PDF Specific Styles */
.upload-area {
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.upload-area:hover {
    background-color: #f1f5f9;
    border-color: #2563eb;
}

#mergeBtn {
    transition: background-color 0.2s ease;
}

#mergeBtn:hover {
    background-color: #1d4ed8;
}

#mergeBtn:disabled {
    background-color: #94a3b8;
    cursor: not-allowed;
}