/* gmxcitations: citation hover tooltips */
a[data-gmx-citation] {
    position: relative;
    cursor: help;
}
a[data-gmx-citation]::after {
    content: attr(data-gmx-citation);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    width: max-content;
    max-width: min(480px, 90vw);
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 0.78rem;
    font-style: normal;
    line-height: 1.45;
    white-space: normal;
    word-break: break-word;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 1000;
    background: var(--color-tooltip-background, #2b2b2b);
    color: var(--color-tooltip-foreground, #f0f0f0);
    box-shadow: 0 2px 8px rgba(0,0,0,0.35);
}
a[data-gmx-citation]:hover::after,
a[data-gmx-citation]:focus::after {
    opacity: 1;
}