.stfn-tooltip {
    position: absolute;
    background-color: rgba(0,0,0, 0.9);
    color: rgba(255,255,255, 0.8);
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 12px;
    font-weight: 400;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(0,0,0, 0.9);
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.1s ease;
    pointer-events: none;
}

.stfn-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border-width: 5px;
    border-style: solid;
    border-color: rgba(0,0,0, 0.9) transparent transparent transparent;
}

.stfn-tooltip.show {
    opacity: 1;
    transform: translateY(0);
    z-index: 5;
}