.loader {
    border: 8px solid #f3f3f3; /* Light grey */
    border-top: 8px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 50px; /* Spinner size */
    height: 50px; /* Spinner size */
    animation: spin 1s linear infinite;
    position: fixed; /* Fixed position */
    top: 50%; /* Center vertically */
    left: 50%; /* Center horizontally */
    transform: translate(-50%, -50%); /* Center align */
    display: none; /* Hidden by default */
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    color: red;
    margin: 10px 0;
}

.pdf-preview {
    margin-top: 20px;
}

#downloadLink {
    margin-top: 20px;
    display: inline-block;
    padding: 10px 15px;
    background-color: #3498db; /* Blue background */
    color: white;
    text-decoration: none;
    border-radius: 5px;
}

#downloadLink:hover {
    background-color: #2980b9; /* Darker blue on hover */
}