body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background-color: #f8f9fa;
    color: #343a40;
    margin: 0;
}
header {
    background-color: #343a40;
    color: #fff;
    padding: 1rem;
    text-align: center;
}
main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 1rem;
}
section {
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}
input[type="file"] {
    display: block;
    margin-bottom: 1rem;
}
button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
}
button:hover {
    background-color: #0056b3;
}
#output-log {
    background-color: #e9ecef;
    padding: 1rem;
    min-height: 150px;
    border-radius: 5px;
    white-space: pre-wrap;
    word-wrap: break-word;
}
#download-link {
    display: inline-block;
    margin-top: 1rem;
    background-color: #28a745;
    color: #fff;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
}