.btn {
    margin-top: 10px;
    margin-bottom: 10px;
}

.btn-primary, .btn-secondary, .btn-danger, .btn-warning, .btn-light {
    transition: background-color 0.3s ease;
}

.btn:hover {
    filter: brightness(90%);
}

.alert {
    margin-top: 20px;
}

/* Accessibility helper classes */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}