/* Timeline D3 Container - Metro Map Canvas */
.timeline-container {
    flex: 1;
    overflow: auto;
    position: relative;
    background-color: var(--color-bg-primary);
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.timeline-canvas {
    position: relative;
    min-height: 100%;
    padding: var(--spacing-xl);
    width: 100%;
    display: flex;
    justify-content: center;
}

/* Wrapper for timeline content and button */
.timeline-content-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xl);
}

/* Timeline Lanes */
.timeline-lanes {
    display: flex;
    gap: 80px;
    position: relative;
    justify-content: center;
    width: fit-content;
    margin: 0 auto;
    align-items: flex-start;
    padding-left: 140px; /* Space for date markers on left */
}

.timeline-lane {
    display: flex;
    flex-direction: column;
    position: relative;
    width: 300px;
}

/* Lane Header - Metro Line Label */
.lane-header {
    position: sticky;
    top: 4px;
    background-color: var(--color-bg-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    z-index: 6;
    box-shadow: var(--shadow-md);
    border: 4px solid var(--color-border);
}

.lane-title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.lane-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
}

.lane-level-badge {
    padding: 4px 10px;
    background-color: var(--color-bg-elevated);
    color: var(--color-text-primary);
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Timeline Events Container */
.timeline-events-container {
    position: relative;
}

/* Main Timeline SVG */
.main-timeline-svg {
    z-index: 0;
}

.timeline-line-svg {
    filter: drop-shadow(0 0 3px rgba(0, 0, 0, 0.5));
}

/* Timeline Events - Metro stations */
.timeline-event {
    
    min-height: 60px;
    pointer-events: none;
    z-index: 2;
}

.timeline-event:has(.event-marker:hover, .event-content:hover) {
    transform: scale(1.00);
}

/* Event Marker - Metro Station Dot */
.event-marker {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border-radius: 100%;
    border: 4px solid var(--color-bg-primary);
    z-index: 2;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    cursor: pointer;
    pointer-events: auto;
}

/* Event Marker Colors - Station types */
.event-marker.publish {
    background-color: #00a651;
}

.event-marker.branch-create,
.event-marker.branch-opened {
    background-color: #0077c0;
}

.event-marker.branch-closed,
.event-marker.branch-merge {
    background-color: #9b59b6;
}

.event-marker.branch-archive {
    background-color: #f7931d;
}

.event-marker.branch-update {
    background-color: #17a2b8;
}

.event-marker.branch-autosave {
    background-color: #0077c0;
    opacity: 0.5;
}

.event-marker.update,
.event-marker.changelog {
    background-color: #ffc72c;
}

.timeline-event:has(.event-marker:hover, .event-content:hover) .event-marker,
.event-marker:hover {
    transform: translate(-50%, -50%) scale(1.15);
    box-shadow: 0 0 0 10px rgba(0, 0, 0, 0.08), 0 6px 16px rgba(0, 0, 0, 0.3);
    z-index: 1;
}

/* White dot indicator for changelog events */
.event-marker::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background-color: white;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.timeline-event.has-changelog .event-marker::after {
    width: 8px;
    height: 8px;
}

/* Event Content - Minimalist station label */
.event-content {
    position: absolute;
    left: calc(50% + 12px);
    top: 50%;
    transform: translateY(-50%);
    padding: 6px 10px;
    background-color: transparent;
    border-radius: 8px;
    border: 2px solid transparent;
    
    min-width: 80px;
    white-space: nowrap;
    z-index: 2;
    cursor: pointer;
    pointer-events: auto;
}

.timeline-event:has(.event-marker:hover, .event-content:hover) .event-content,
.event-content:hover {
    background-color: var(--color-bg-elevated);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    padding: 10px 14px;
    border: 2px solid var(--color-border);
    z-index: 50;
}

.timeline-event.selected .event-content {
    background-color: var(--color-bg-elevated);
    border: 2px solid var(--metro-blue);
    box-shadow: 0 4px 16px rgba(88, 166, 255, 0.3);
    padding: 10px 14px;
}

/* Ensure selected cards maintain focus styles even when hovered */
.timeline-event.selected:has(.event-marker:hover, .event-content:hover) .event-content,
.timeline-event.selected .event-content:hover {
    border: 2px solid var(--metro-blue);
    box-shadow: 0 4px 16px rgba(88, 166, 255, 0.3);
}

/* Hide detailed info by default, show on hover/selected */
.event-type,
.event-label,
.event-user,
.event-elements,
.event-branch-badge,
.event-merge-badge,
.event-branch-stats {
    display: none;
}

.timeline-event:has(.event-marker:hover, .event-content:hover) .event-label,
.timeline-event.selected .event-label {
    display: block;
}

.timeline-event:has(.event-marker:hover, .event-content:hover) .event-user,
.timeline-event.selected .event-user {
    display: flex;
}

.timeline-event:has(.event-marker:hover, .event-content:hover) .event-branch-badge,
.timeline-event.selected .event-branch-badge,
.timeline-event:has(.event-marker:hover, .event-content:hover) .event-merge-badge,
.timeline-event.selected .event-merge-badge {
    display: block;
}

.event-date {
    font-size: 12px;
    font-weight: 700;
    color: var(--color-text-primary);
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.event-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-top: 6px;
    margin-bottom: 4px;
    line-height: 1.3;
}

.event-user {
    font-size: 11px;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 4px;
}

.event-branch-stats {
    font-size: 12px;
    color: var(--color-text-primary);
    margin-top: 6px;
    font-weight: 600;
    background-color: rgba(0, 119, 192, 0.1);
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-block;
}

/* Merged tag style */
.event-branch-stats.merged {
    background-color: rgba(155, 89, 182, 0.15);
    color: #9b59b6;
}

/* Archived tag style */
.event-branch-stats.archived {
    background-color: rgba(247, 147, 29, 0.15);
    color: #f7931d;
}

.timeline-event:has(.event-marker:hover, .event-content:hover) .event-branch-stats,
.timeline-event.selected .event-branch-stats {
    display: inline-block;
}

.event-branch-badge,
.event-merge-badge {
    font-size: 11px;
    color: #0077c0;
    margin-bottom: 4px;
    font-weight: 600;
}

.event-merge-badge {
    color: #9b59b6;
}

/* User profile image */
.user-profile-img {
    width: 16px;
    height: 16px;
    border-radius: 100%;
    margin-right: 4px;
    vertical-align: middle;
    border: 1px solid var(--color-border);
}

/* User avatar with initials */
.user-avatar-initials {
    display: inline-block;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    margin-right: 4px;
    vertical-align: middle;
    color: white;
    font-size: 8px;
    font-weight: 600;
    line-height: 16px;
    text-align: center;
    flex-shrink: 0;
}

/* Connection Lines - Metro style */
.connection-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: visible;
}

.connection-line {
    opacity: 0.5;
    pointer-events: auto;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.connection-line:hover {
    opacity: 0.85;
    stroke-width: 10px !important;
    filter: drop-shadow(0 2px 6px rgba(0, 119, 192, 0.4));
}

.connection-arrow {
    fill: #0077c0;
}

/* Date Markers Column - Sticky to left within scrolling container */
.date-markers-column {
    position: absolute;
    left: 0;
    top: 0;
    width: 130px;
    flex-shrink: 0;
    z-index: 0;
    pointer-events: none;
}

.date-marker {
    position: absolute;
    left: 0;
    width: 100vw;
    pointer-events: none;
    z-index: 0;
    display: flex;
    align-items: center;
}

.date-marker-line {
    position: absolute;
    left: 130px;
    right: 0;
    height: 1px;
    background: var(--color-border-light);
    opacity: 0.5;
    pointer-events: none;
}

.date-marker-label {
    position: sticky;
    left: 12px;
    font-size: 12px;
    color: var(--color-text-primary);
    
    padding: 6px 14px;
    white-space: nowrap;
    font-weight: 600;
    letter-spacing: 0.3px;
    border-left: 3px solid var(--color-text-tertiary);
    
}

/* Empty State */
.timeline-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-text-tertiary);
    gap: var(--spacing-md);
}

.timeline-empty svg {
    width: 64px;
    height: 64px;
    opacity: 0.5;
}

.timeline-empty-text {
    font-size: var(--font-size-md);
}

/* Load More Button */
.load-more-container {
    width: 100%;
    display: flex;
    justify-content: center;
    margin: var(--spacing-xl) 0;
    padding-bottom: var(--spacing-xl);
}

.load-more-btn {
    min-width: 280px;
}

.load-more-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Mobile: Keep button centered in viewport horizontally while scrolling */
@media (max-width: 768px) {
    .load-more-container {
        position: sticky;
        left: 0;
        right: 0;
        width: 100vw;
        margin-left: calc(-1 * var(--branch-left-padding, 160px) - 20px);
    }
}

/* ============================================
   Branch Parallel Timeline Lanes (Metro Style)
   ============================================ */

.branch-parallel-lane {
    position: absolute;
    top: var(--branch-top, 0);
    pointer-events: auto;
    z-index: 1;
    opacity: 0.95;
    width: 8px;  /* Minimum width to accommodate branch line stroke */
}

.branch-parallel-lane:hover {
    z-index: 2;
    opacity: 1;
}

/* Branch SVG */
.branch-svg {
    z-index: 0;
}

/* Branch line styling */
.branch-line {
    filter: drop-shadow(0 0 3px rgba(0, 0, 0, 0.5));
}

/* Start marker at branch creation */
.branch-start-marker {
    position: absolute;
    left: 50%;
    transform: translate(-50%, 50%);
    width: 16px;
    height: 16px;
    border: 3px solid var(--color-bg-primary);
    border-radius: 100%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    z-index: 3;
}

.branch-parallel-lane:hover .branch-start-marker {
    width: 18px;
    height: 18px;
    box-shadow: 0 0 0 8px rgba(0, 0, 0, 0.08), 0 6px 16px rgba(0, 0, 0, 0.45);
}

/* End marker at merge/archive */
.branch-end-marker {
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 4px solid var(--color-bg-primary);
    border-radius: 100%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.branch-parallel-lane:hover .branch-end-marker {
    width: 24px;
    height: 24px;
    box-shadow: 0 0 0 8px rgba(0, 0, 0, 0.08), 0 6px 16px rgba(0, 0, 0, 0.45);
}

/* Branch name label */
.branch-name-label {
    position: absolute;
    left: 24px;
    background: var(--color-bg-elevated);
    padding: 8px 12px;
    border-radius: 8px;
    border: 3px solid var(--branch-color, #0077c0);
    white-space: nowrap;
    z-index: 2;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
    max-width: 260px;
    transition: all var(--transition-fast);
}

.branch-parallel-lane:hover .branch-name-label {
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.branch-name-label .branch-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.branch-name-label .branch-icon {
    font-size: 15px;
    line-height: 1;
}

.branch-name-label .branch-name {
    font-weight: 700;
    color: var(--color-text-primary);
    font-size: 13px;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: -0.2px;
}

.branch-name-label .branch-meta {
    font-size: 11px;
    color: var(--color-text-tertiary);
    line-height: 1.3;
    margin-top: 3px;
}

.branch-name-label .branch-stats {
    color: var(--branch-color, #0077c0);
    font-weight: 700;
}

.branch-name-label .branch-duration {
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Active branch indicator */
.active-branch-indicator {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-bg-elevated);
    padding: 6px 12px;
    border-radius: 6px;
    border: 3px solid var(--branch-color, #0077c0);
    font-size: 11px;
    color: var(--color-text-secondary);
    z-index: 3;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.4);
    white-space: nowrap;
    transition: all var(--transition-fast);
    cursor: pointer;
    text-align: center;
}

.branch-parallel-lane:hover .active-branch-indicator {
    transform: translateX(-50%) scale(1.05);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.active-branch-indicator .active-branch-name {
    color: var(--color-text-primary);
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 2px;
}

.active-branch-indicator .active-badge {
    color: var(--branch-color, #0077c0);
    font-size: 10px;
    font-weight: 500;
}

/* Branch event items on parallel lane */
.branch-parallel-lane .branch-event-item {
    position: absolute;
    left: 0;
    width: auto;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.branch-parallel-lane .branch-event-item .event-marker {
    position: absolute;
    left: 50%;
    top: -9px;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--color-bg-elevated);
    border: 4px solid var(--branch-color, #0077c0);
    border-radius: 100%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    z-index: 2;
    transition: all 0.2s ease;
}

.branch-parallel-lane .branch-event-item:hover .event-marker {
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.35);
}

.branch-parallel-lane:hover .branch-event-item .event-marker {
    border-width: 5px;
}

.branch-parallel-lane .branch-event-item .event-content {
    position: absolute;
    left: 18px;
    top: -8px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--branch-color, #0077c0);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.branch-parallel-lane .branch-event-item:hover .event-content {
    opacity: 1;
}

.branch-parallel-lane .branch-event-item .event-time {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 11px;
}

/* Branch autosave events (dimmed) */
.branch-parallel-lane .branch-event-item.autosave .event-marker {
    opacity: 0.5;
    width: 12px;
    height: 12px;
    border-width: 3px;
}

.branch-parallel-lane .branch-event-item.autosave .event-content {
    opacity: 0.6;
    border-left-style: dashed;
}

/* Branch color classes */
.branch-parallel-lane.active {
    --branch-color: #0077c0;
}

.branch-parallel-lane.merged {
    --branch-color: #9b59b6;
}

.branch-parallel-lane.archived {
    --branch-color: #f7931d;
}
/* ============================================
   Mobile Responsive Styles
   ============================================ */

@media (max-width: 768px) {
    .timeline-container {
        overflow: scroll;
        -webkit-overflow-scrolling: touch;
        justify-content: flex-start;
        align-items: flex-start;
    }
    
    .timeline-canvas {
        min-width: max-content;
        width: auto;
        padding: var(--spacing-lg);
        justify-content: flex-start;
    }
    
    .timeline-content-wrapper {
        align-items: flex-start;
        margin-left: 20px; /* Add visible margin so user knows they can scroll */
        /* Use CSS custom properties set by JS for dynamic branch padding */
        --branch-left-padding: 160px;
        --branch-right-padding: 150px;
    }
    
    .timeline-lanes {
        min-width: max-content;
        gap: 60px;
        margin: 0;
        /* Use dynamic padding from CSS variables set by JS */
        padding-left: var(--branch-left-padding, 160px);
        padding-right: var(--branch-right-padding, 150px);
        justify-content: flex-start;
    }
    
    .timeline-lane {
        min-width: 300px;
        width: 300px;
    }
    
    .lane-header {
        min-width: 220px;
        max-width: none;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .lane-title {
        font-size: var(--font-size-sm);
        white-space: normal;
        word-break: break-word;
    }
    
    /* Ensure date markers are visible */
    .date-marker-group {
        left: -130px !important;
        min-width: 110px;
    }
    
    /* Ensure event content doesn't get cut off */
    .event-content {
        white-space: nowrap;
        min-width: 120px;
    }
    
    /* Branch lanes need space too */
    .branch-parallel-lane {
        min-width: 70px;
    }
    
    .branch-label {
        white-space: nowrap;
        max-width: none;
        font-size: 10px;
    }
    
    /* Branch containers */
    .branch-container {
        margin-left: 0;
    }
}

/* Smaller mobile devices */
@media (max-width: 480px) {
    .timeline-canvas {
        padding: var(--spacing-md);
    }
    
    .timeline-lanes {
        gap: 50px;
        /* Still use dynamic padding, but with smaller minimums for tiny screens */
        padding-left: var(--branch-left-padding, 140px);
        padding-right: var(--branch-right-padding, 120px);
    }
    
    .timeline-lane {
        min-width: 300px;
        width: 300px;
    }
    
    .lane-header {
        min-width: 200px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .lane-title {
        font-size: var(--font-size-xs);
    }
    
    .event-marker {
        width: 18px;
        height: 18px;
    }
    
    .event-content {
        min-width: 100px;
        font-size: var(--font-size-sm);
    }
    
    .event-date {
        font-size: 11px;
    }
    
    .date-marker-group {
        left: -120px !important;
    }
}