.tnsa-addon {
    margin: 1.5rem 0;
    padding: 1.25rem;
    border: 1px solid #a7d9c4;
    border-radius: 14px;
    background: linear-gradient(135deg, #effbf5 0%, #fff 72%);
}

.tnsa-addon > legend {
    padding: 0 .35rem;
    color: #135d3f;
    font-size: 1.08rem;
    font-weight: 700;
}

.tnsa-addon__intro,
.tnsa-addon small {
    color: #426256;
}

.tnsa-addon__details {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #cfe9dc;
}

.tnsa-addon__tier {
    display: grid;
    gap: .6rem;
    margin: 1rem 0 0;
    padding: .9rem;
    border: 1px solid #d6e9df;
    border-radius: 10px;
    background: #fff;
}

.tnsa-addon__tier legend {
    padding: 0 .25rem;
    font-weight: 600;
}

.tnsa-addon__tier label {
    display: block;
    margin: 0;
}