body {
    background-color: #F8F9FA;
}

.hero {
    background: linear-gradient(135deg, #0D6EFD, #6f42c1);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.upload-section, .files-section {
    background-color: #FFFFFF;
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    margin-bottom: 2rem;
}