/* ── Tooltips ── */
.metric-tip {
    position: relative;
    cursor: help;
    border-bottom: 1px dotted currentColor;
}
.metric-tip::after {
    content: attr(data-tip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #1e293b;
    color: #f1f5f9;
    font-size: 0.8rem;
    font-weight: 400;
    padding: 0.4em 0.7em;
    border-radius: var(--rlab-radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    z-index: 100;
}
.metric-tip:hover::after {
    opacity: 1;
}