/* basic styling for abbreviations */
abbr[data-tooltip] {
    position: relative;
    cursor: help;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 2px;
    color: #0066cc;
    border-bottom: none; /* remove standard-Browser-tooltip */
}

/* tooltip-container */
abbr[data-tooltip]::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: white;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    pointer-events: none;
    margin-bottom: 5px;
}

/* tooltip-arrow */
abbr[data-tooltip]::after {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid #333;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1000;
    pointer-events: none;
}

/* show tooltip on hover */
abbr[data-tooltip]:hover::before,
abbr[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
}

/* responsive changes */
@media (max-width: 768px) {
    abbr[data-tooltip]::before {
        font-size: 0.8rem;
        padding: 6px 10px;
        max-width: 200px;
        white-space: normal;
    }
}