.hc-calculator#hc-brine-calc {
    background: #e1f5fe;
    border: 1px solid #0288d1;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.hc-result-value {
    color: #01579b;
    font-size: 2em;
}

.hc-result-note {
    font-size: 0.85em;
    color: #0277bd;
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px solid #b3e5fc;
}