:root {
    --page-padding: 18px 22px 40px;
    --page-padding-mobile: 10px 8px 28px;
    --event-card-width: 284px;
    --event-card-min-height: 132px;
}

.timeline-wrap {
    margin: 0 auto;
    max-width: 1680px;
    overflow-x: auto;
    padding-bottom: 28px;
    scroll-behavior: smooth;
}

.timeline {
    min-width: 980px;
    min-height: 1100px;
}

.timeline-axis {
    position: absolute;
    top: 68px;
    bottom: 88px;
    width: 4px;
    border-radius: 999px;
    background: var(--axis);
    left: 50%;
    transform: translateX(-50%);
    z-index: 0;
}

.year-marker {
    position: absolute;
    width: 22px;
    height: 2px;
    background: var(--axis);
    transform: translate(-50%, -50%);
    transition: opacity 0.3s ease;
}

.year-marker span {
    position: absolute;
    top: 50%;
    left: calc(100% + 10px);
    transform: translateY(-50%);
    font-size: 0.8rem;
    color: var(--muted);
    font-weight: 700;
    white-space: nowrap;
}

.period-marker {
    position: absolute;
    left: 24px;
    width: 188px;
    border-left: 3px solid color-mix(in oklab, var(--text) 18%, var(--axis));
    border-radius: 14px;
    background: color-mix(in oklab, var(--surface-2) 86%, transparent);
    border-top: 1px solid var(--border);
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 12px 12px 12px 14px;
    display: flex;
    align-items: flex-start;
}

.period-marker span {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
    line-height: 1.35;
}

.event-card.in-view {
    animation-duration: 0.5s;
    animation-timing-function: ease-out;
    animation-fill-mode: both;
}

.event-card.side-left {
    transform: translateX(20px);
}

.event-card.side-right {
    transform: translateX(-20px);
}

.event-card.side-left.in-view {
    animation-name: reveal-left;
}

.event-card.side-right.in-view {
    animation-name: reveal-right;
}

.event-card.filtered-out {
    opacity: 0;
    transform: scale(0.95);
    pointer-events: none;
    visibility: hidden;
}

@keyframes reveal-left {
    from {
        opacity: 0;
        transform: translateX(28px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes reveal-right {
    from {
        opacity: 0;
        transform: translateX(-28px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.connector {
    position: absolute;
    pointer-events: none;
    z-index: -1;
}

.connector-vertical,
.connector-horizontal {
    position: absolute;
    display: block;
    background: color-mix(in oklab, var(--axis) 85%, transparent);
    border-radius: 999px;
    z-index: -1;
}

.connector-vertical {
    top: 0;
    width: 2px;
}

.connector.side-right .connector-vertical {
    left: 0;
}

.connector.side-left .connector-vertical {
    right: 0;
}

.connector-horizontal {
    left: 0;
    right: 0;
    height: 2px;
}

.timeline-break {
    position: absolute;
    width: 32px;
    height: 34px;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 3;
}

.timeline-break::before,
.timeline-break::after {
    content: "";
    position: absolute;
    left: 4px;
    width: 24px;
    height: 6px;
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    border-radius: 999px;
    transform: rotate(28deg);
    box-shadow: 0 0 0 1px color-mix(in oklab, var(--surface) 72%, transparent);
}

.timeline-break::before {
    top: 8px;
}

.timeline-break::after {
    top: 18px;
}

.timeline-break-label {
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%);
    padding: 4px 9px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: color-mix(in oklab, var(--surface) 92%, transparent);
    color: var(--muted);
    font-size: 0.64rem;
    font-weight: 700;
    white-space: nowrap;
    letter-spacing: 0.02em;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(8px);
}

.timeline-break[data-kind="expanded"]::before,
.timeline-break[data-kind="expanded"]::after {
    border-top-color: color-mix(in oklab, #4fc3f7 58%, var(--border));
    border-bottom-color: color-mix(in oklab, #4fc3f7 58%, var(--border));
}

.timeline-break[data-kind="expanded"] .timeline-break-label {
    color: color-mix(in oklab, var(--text) 82%, #4fc3f7);
    border-color: color-mix(in oklab, #4fc3f7 40%, var(--border));
}

@media (max-width: 980px) {
    :root {
        --event-card-width: 254px;
    }

    .timeline {
        min-width: 720px;
    }

    .period-marker {
        width: 86px;
        padding: 10px 8px 10px 10px;
    }

    .period-marker span {
        font-size: 0.66rem;
    }

    .timeline-break-label {
        display: none;
    }
}

@media (max-width: 720px) {
    .timeline {
        min-width: 620px;
    }
}