body {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    min-height: 100vh;
}
.card {
    max-width: 600px;
    margin: 2rem auto;
    border: none;
    border-radius: 1rem;
    overflow: hidden;
}
.card-header {
    padding: 1.5rem;
}
#audioPlayer {
    border: 1px solid #dee2e6;
    margin-top: 1.5rem;
}
.alert {
    border-radius: 0.75rem;
}