/* Timeline Page Styles */
.timeline-page {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    min-height: calc(100vh - var(--header-height));
}

.timeline-page__header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown var(--transition-normal) forwards;
}

.timeline-page__title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: var(--spacing-sm);
}

.timeline-page__subtitle {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

/* Timeline Container */
.timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

/* Central Line */
.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    background: var(--color-border);
    transform: translateX(-50%);
    z-index: 0;
}

/* Timeline Item */
.timeline__item {
    position: relative;
    margin-bottom: var(--spacing-xl);
    width: 50%;
    padding: 0 var(--spacing-xl);
    box-sizing: border-box;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.timeline__item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Alternating Layout */
.timeline__item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline__item:nth-child(even) {
    left: 50%;
    text-align: left;
}

/* Marker (Dot) */
.timeline__marker {
    position: absolute;
    top: 24px;
    width: 16px;
    height: 16px;
    background: var(--color-bg-surface);
    border: 4px solid var(--color-primary);
    border-radius: 50%;
    z-index: 1;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.timeline__item:nth-child(odd) .timeline__marker {
    right: -8px; /* Half of width */
}

.timeline__item:nth-child(even) .timeline__marker {
    left: -8px;
}

.timeline__item:hover .timeline__marker {
    background: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-bg-surface-alt);
}

/* Date Label */
.timeline__date {
    display: inline-block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-primary);
    font-size: 0.9rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-surface-alt);
    border-radius: var(--radius-sm);
}

/* Content Card */
.timeline__content {
    background: var(--color-bg-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
    border: 1px solid var(--color-border);
    position: relative;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    text-align: left; /* Reset text align for content inside */
}

.timeline__item:hover .timeline__content {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
    border-color: var(--color-primary);
}

/* Arrow */
.timeline__content::after {
    content: '';
    position: absolute;
    top: 24px;
    width: 0;
    height: 0;
    border-style: solid;
    z-index: 1;
}

.timeline__item:nth-child(odd) .timeline__content::after {
    right: -10px;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent var(--color-bg-surface);
}

.timeline__item:nth-child(odd) .timeline__content::before {
    content: '';
    position: absolute;
    top: 24px;
    right: -11px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent var(--color-border);
    z-index: 0;
}


.timeline__item:nth-child(even) .timeline__content::after {
    left: -10px;
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--color-bg-surface) transparent transparent;
}
.timeline__item:nth-child(even) .timeline__content::before {
    content: '';
    position: absolute;
    top: 24px;
    left: -11px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--color-border) transparent transparent;
    z-index: 0;
}

/* Update arrow border on hover */
.timeline__item:nth-child(odd):hover .timeline__content::before {
    border-left-color: var(--color-primary);
}

.timeline__item:nth-child(even):hover .timeline__content::before {
    border-right-color: var(--color-primary);
}


.timeline__title {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
    color: var(--color-text-main);
    font-weight: 700;
}

.timeline__body {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.timeline__more {
    display: inline-block;
    margin-top: var(--spacing-md);
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.timeline__more:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translate3d(0, -20px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

/* Loading & End States */
.timeline__loading,
.timeline__end {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl) 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.timeline__loading i {
    font-size: 1.2rem;
    color: var(--color-primary);
}

.timeline__end {
    opacity: 0.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }

    .timeline__item {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
        margin-bottom: var(--spacing-lg);
    }

    .timeline__item:nth-child(odd),
    .timeline__item:nth-child(even) {
        left: 0;
        text-align: left;
    }

    .timeline__item:nth-child(odd) .timeline__marker,
    .timeline__item:nth-child(even) .timeline__marker {
        left: 12px;
        right: auto;
    }
    
    .timeline__item:nth-child(odd) .timeline__content::after,
    .timeline__item:nth-child(even) .timeline__content::after {
        left: -10px;
        right: auto;
        border-width: 10px 10px 10px 0;
        border-color: transparent var(--color-bg-surface) transparent transparent;
    }

     .timeline__item:nth-child(odd) .timeline__content::before,
    .timeline__item:nth-child(even) .timeline__content::before {
        left: -11px;
        right: auto;
        border-width: 10px 10px 10px 0;
        border-color: transparent var(--color-border) transparent transparent;
    }

    /* Update arrow border on hover for mobile */
    .timeline__item:nth-child(odd):hover .timeline__content::before,
    .timeline__item:nth-child(even):hover .timeline__content::before {
        border-right-color: var(--color-primary);
        border-left-color: transparent; /* Reset left border color if set by desktop rules */
    }
}