.btn-tooltip {
    position: fixed;
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 13px;
    color: #222;
    white-space: normal;
    min-width: 200px;
    max-width: 280px;
    line-height: 1.5;
    box-shadow: 0 2px 12px rgba(0,0,0,0.10);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.18s;
    z-index: 9999;
}
.btn-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: #ddd;
}
.btn-tooltip::before {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 7px solid transparent;
    border-top-color: #ffffff;
    z-index: 1;
}