/** Timeline Visualization
 * Vertical timeline display using definition lists
 */

/* Container */
.markdown-section dl.timeline {
    --timeline-border-width:    3px;

    --timeline-line-color:      var(--theme-color);
    --timeline-marker-color:    var(--theme-color);
    --timeline-marker-bg-color: var(--theme-color-2);
    --timeline-marker-hi-color: var(--theme-color-6);

    --timeline-date-fg-color:   var(--secondary-color-5);
    --timeline-title-fg-color:  var(--theme-color-5);

    margin: 2em 1em;
}

/* Date and title row */

.markdown-section dl.timeline dt {
    display: flex;
    gap: 0.8em;
    align-items: center;
    height: 1.5em;
}

.markdown-section dl.timeline dt .marker {
    display: block;
    width: 1.5em;
    height: 1.5em;
    flex-shrink: 0;
    border: var(--timeline-border-width) solid var(--timeline-marker-color);
    background-color: var(--timeline-marker-bg-color);
    border-radius: 3em;
    transition: background-color 250ms, border-color 250ms;
}

.markdown-section dl.timeline dt .date {
    display: block;
    font-size: 1.2em;
    color: var(--timeline-date-fg-color);
    white-space: nowrap;
}

.markdown-section dl.timeline dt .title {
    font-size: 1.1em;
    line-height: 1;
    color: var(--timeline-title-fg-color);
}

/* Timeline content */

.markdown-section dl.timeline dd {
    margin: 0 0 0 calc((1.5em - var(--timeline-border-width)) / 2);
    padding: 0.5em 0 2em 2em;
}

.markdown-section dl.timeline dd:empty {
    padding-block: 0.8em;
}

.markdown-section dl.timeline dd:last-child {
    padding-bottom: 0;
}

.markdown-section dl.timeline dd:last-child:empty {
    padding-top: 0;
}

.markdown-section dl.timeline dd:not(:last-of-type) {
    border-left: var(--timeline-border-width) solid var(--timeline-line-color);
}

.markdown-section dl.timeline dd > :first-child {
    margin-top: 0;
}

.markdown-section dl.timeline dd > :last-child {
    margin-bottom: 0;
}


/* HOVER EFFECTS */

.markdown-section dl.timeline dt,
.markdown-section dl.timeline dd {
    transition: filter 250ms;
}

.markdown-section dl.timeline dt:hover,
.markdown-section dl.timeline dd:hover,
.markdown-section dl.timeline dt:hover + dd,
.markdown-section dl.timeline dt:has(+ dd:hover) {
    filter: brightness(1.1);
}

.markdown-section dl.timeline dt:hover .marker,
.markdown-section dl.timeline dt:has(+ dd:hover) .marker {
    background-color: var(--timeline-marker-hi-color);
    border-color: var(--timeline-marker-hi-color);
}