.timeline-preview {
    position: relative;
}

.timeline-horizontal-wrapper {
    position: relative;
    margin: 0 auto;
}

.timeline-horizontal-track {
    position: absolute;
    top: 92px;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--border-light);
    border-radius: var(--radius-full);
    z-index: 0;
}

.timeline-horizontal-track::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: var(--gradient-primary);
    opacity: 0.3;
    border-radius: var(--radius-full);
}

.timeline-horizontal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
    position: relative;
    z-index: 1;
}

.timeline-horizontal-grid.is-scrollable {
    grid-auto-flow: column;
    grid-auto-columns: minmax(320px, 1fr);
    overflow-x: hidden;
    overscroll-behavior-x: contain;
    scroll-snap-type: x mandatory;
    padding-bottom: var(--spacing-6);
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    touch-action: pan-y;
}

.timeline-horizontal-grid.is-scrollable.dragging {
    cursor: grabbing;
    scroll-snap-type: none;
}

.timeline-horizontal-grid.is-scrollable .timeline-horizontal-item {
    pointer-events: auto;
}

.timeline-horizontal-grid.is-scrollable.dragging .timeline-horizontal-item {
    pointer-events: none;
}

.timeline-horizontal-wrapper.is-scrollable::before,
.timeline-horizontal-wrapper.is-scrollable::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 60px;
    z-index: 2;
    pointer-events: none;
}

.timeline-horizontal-wrapper.is-scrollable::after {
    right: 0;
}

.timeline-horizontal-wrapper.is-scrollable.at-start::before {
    opacity: 0;
}

.timeline-horizontal-wrapper.is-scrollable.at-end::after {
    opacity: 0;
}

.timeline-horizontal-nav {
    position: absolute;
    top: 91px;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    box-shadow: var(--shadow-md);
    z-index: 3;
    transition: all var(--transition-base);
}

.timeline-horizontal-nav:hover {
    background: var(--bg-secondary);
    color: var(--primary-red);
}

.timeline-horizontal-nav:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.timeline-horizontal-nav.prev {
    left: var(--spacing-2);
}

.timeline-horizontal-nav.next {
    right: var(--spacing-2);
}

.timeline-horizontal-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    transition: transform var(--transition-base);
}

.timeline-horizontal-item:hover {
    transform: translateY(-10px);
}

.timeline-horizontal-meta {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--spacing-6);
    position: relative;
}

.timeline-horizontal-year {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--primary-red);
    margin-bottom: var(--spacing-4);
    font-family: var(--font-display);
}

.timeline-horizontal-marker {
    width: 20px;
    height: 20px;
    background: var(--primary-red);
    border: 4px solid var(--bg-primary);
    border-radius: var(--radius-full);
    box-shadow: 0 0 0 4px rgba(196, 30, 58, 0.2);
    z-index: 2;
    transition: all var(--transition-base);
}

.timeline-horizontal-item:hover .timeline-horizontal-marker {
    transform: scale(1.3);
    background: var(--bg-primary);
    border-color: var(--primary-red);
}

.timeline-horizontal-content {
    background: var(--bg-primary);
    padding: var(--spacing-6);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-light);
    width: 100%;
    min-height: 160px;
    position: relative;
}

.timeline-horizontal-content::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border-left: 1px solid var(--border-light);
    border-top: 1px solid var(--border-light);
}

.timeline-horizontal-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
    font-family: var(--font-primary);
}

.timeline-horizontal-description {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: var(--line-height-normal);
}

.timeline-horizontal-item.memorial-item .timeline-horizontal-marker.memorial-marker {
    background: var(--accent-gold);
    box-shadow: 0 0 0 4px rgba(214, 158, 46, 0.3);
    width: 28px;
    height: 28px;
    transform: translateY(4px);
}

.timeline-horizontal-item.memorial-item .timeline-horizontal-content {
    border: 2px solid var(--accent-gold);
    background: linear-gradient(to bottom right, var(--bg-primary), var(--bg-secondary));
}

.timeline-horizontal-item.memorial-item .timeline-horizontal-year {
    color: var(--accent-gold);
}

@media (max-width: 900px) {
    .timeline-horizontal-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .timeline-horizontal-track {
        width: 4px;
        height: 100%;
        left: 24px;
        top: 0;
    }

    .timeline-horizontal-item {
        flex-direction: row;
        text-align: left;
        margin-bottom: var(--spacing-12);
        align-items: flex-start;
    }

    .timeline-horizontal-meta {
        width: 60px;
        margin-right: var(--spacing-4);
        align-items: center;
        flex-shrink: 0;
        flex-direction: column-reverse;
        margin-bottom: 0;
    }

    .timeline-horizontal-year {
        font-size: var(--font-size-lg);
        margin-top: var(--spacing-2);
        margin-bottom: 0;
    }

    .timeline-horizontal-marker {
        margin-top: 4px;
    }

    .timeline-horizontal-content::before {
        left: -8px;
        top: 20px;
        transform: rotate(-45deg);
    }
    
    .timeline-horizontal-item:hover {
        transform: translateX(5px);
    }
}

[data-theme="dark"] .timeline-horizontal-content {
    background: var(--bg-secondary);
    border-color: var(--border-dark);
}

[data-theme="dark"] .timeline-horizontal-content::before {
    background: var(--bg-secondary);
    border-color: var(--border-dark);
}

[data-theme="dark"] .timeline-horizontal-marker {
    border-color: var(--bg-secondary);
}