/* ============================================
   Exhibitions timeline (news template layout 8)
   Single column, grouped by year, newest first.
   Rail on the left with a dot per exhibition (green = physical venue).
   ============================================ */

.exhibition-timeline {
    --tl-purple: #9b59b6;
    --tl-purple-dark: #8e44ad;
    --tl-purple-soft: #f3e9f8;
    --tl-green: #4caf50;
    --tl-green-soft: #e4f4e5;
    --tl-green-dark: #2e7d32;
    --tl-text: #2c2c2c;
    --tl-muted: #6b6b6b;
    --tl-line: #e1d3ea;

    max-width: 760px;
    margin: 0 auto;
}

/* Count + filter chips */
.timeline-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem 1rem;
    margin-bottom: 1.5rem;
}

.timeline-count {
    margin: 0;
    color: var(--tl-muted);
    font-size: 0.9rem;
}

.timeline-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.timeline-filters[hidden] {
    display: none;
}

.timeline-chip {
    border: 1px solid var(--tl-line);
    border-radius: 999px;
    background: #fff;
    color: var(--tl-text);
    font-size: 0.85rem;
    line-height: 1.2;
    padding: 0.35rem 0.9rem;
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.timeline-chip:hover {
    border-color: var(--tl-purple);
}

.timeline-chip.is-active {
    background: var(--tl-purple-soft);
    border-color: var(--tl-purple);
    color: var(--tl-purple-dark);
}

.timeline-chip:focus-visible,
.timeline-year-title:focus-visible,
.timeline-link:focus-visible {
    outline: 3px solid var(--tl-purple);
    outline-offset: 2px;
}

/* Year group */
.timeline-year {
    margin-bottom: 1rem;
}

.timeline-year-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.9rem;
    border-radius: 8px;
    background: #f7f4f9;
    cursor: pointer;
    list-style: none;
}

.timeline-year-title::-webkit-details-marker {
    display: none;
}

.timeline-year-title::before {
    content: "\F285"; /* bootstrap-icons: chevron-right */
    font-family: "bootstrap-icons";
    font-size: 0.9rem;
    color: var(--tl-purple);
    transition: transform 0.15s ease;
}

.timeline-year[open] > .timeline-year-title::before {
    transform: rotate(90deg);
}

.timeline-year-number {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--tl-text);
}

.timeline-year-count {
    margin-left: auto;
    font-size: 0.85rem;
    color: var(--tl-muted);
}

/* Rail + items */
.timeline-list {
    list-style: none;
    margin: 1rem 0 0 0.6rem;
    padding: 0 0 0 1.6rem;
    border-left: 2px solid var(--tl-line);
}

.timeline-item {
    position: relative;
    margin-bottom: 0.9rem;
}

.timeline-item[hidden] {
    display: none;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: calc(-1.6rem - 7px);
    top: 1.35rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--tl-purple);
    border: 2px solid #fff;
    box-sizing: content-box;
}

.timeline-item.is-physical::before {
    background: var(--tl-green);
}

.timeline-card {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 0.85rem 1rem;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
}

.timeline-thumb {
    flex: 0 0 72px;
    width: 72px;
    height: 72px;
}

.timeline-thumb a {
    display: block;
    width: 100%;
    height: 100%;
}

.timeline-thumb-image,
.timeline-thumb-placeholder {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 8px;
    object-fit: cover;
}

.timeline-thumb-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--tl-purple-soft);
    color: var(--tl-purple-dark);
    font-size: 1.5rem;
}

.timeline-body {
    flex: 1 1 auto;
    min-width: 0;
}

.timeline-month {
    margin: 0 0 0.15rem;
    font-size: 0.8rem;
    color: var(--tl-muted);
}

.timeline-title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.35;
    color: var(--tl-text);
}

.timeline-venue {
    margin: 0.15rem 0 0;
    font-size: 0.9rem;
    color: var(--tl-muted);
}

.timeline-artwork {
    margin: 0.3rem 0 0;
    font-size: 0.9rem;
    font-style: italic;
    color: var(--tl-text);
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0.5rem 0 0;
}

.timeline-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.15rem 0.6rem;
    border-radius: 999px;
    font-size: 0.78rem;
    background: var(--tl-purple-soft);
    color: var(--tl-purple-dark);
}

.timeline-tag--physical {
    background: var(--tl-green-soft);
    color: var(--tl-green-dark);
}

.timeline-link {
    display: inline-block;
    margin-top: 0.6rem;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--tl-purple);
    text-decoration: none;
}

.timeline-link:hover {
    color: #e91e63;
}

.timeline-empty {
    padding: 1rem;
    text-align: center;
    color: var(--tl-muted);
}

.timeline-empty[hidden] {
    display: none;
}

@media (max-width: 575.98px) {
    .timeline-thumb {
        flex-basis: 56px;
        width: 56px;
        height: 56px;
    }

    .timeline-card {
        gap: 0.75rem;
        padding: 0.75rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .timeline-chip,
    .timeline-year-title::before {
        transition: none;
    }
}