/**
 * Timeline Styles
 * Prefix: .timeline-*
 */

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* Center line */
.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(
        to bottom,
        transparent,
        var(--color-border) 5%,
        var(--color-border) 95%,
        transparent
    );
    transform: translateX(-50%);
}

/* Section label (e.g., "Education") */
.timeline-section-label {
    position: relative;
    text-align: center;
    margin: var(--spacing-xl) 0;
    font-family: var(--font-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    color: var(--color-text-muted);
}

/* Timeline item */
.timeline-item {
    position: relative;
    width: 50%;
    padding: var(--spacing-md);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.timeline-item--visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item--left {
    left: 0;
    padding-right: calc(var(--spacing-xl) + 10px);
    text-align: right;
}

.timeline-item--right {
    left: 50%;
    padding-left: calc(var(--spacing-xl) + 10px);
    text-align: left;
}

/* Node on the timeline */
.timeline-node {
    position: absolute;
    top: calc(var(--spacing-md) + 5px);
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timeline-item--left .timeline-node {
    right: -8px;
}

.timeline-item--right .timeline-node {
    left: -8px;
}

.timeline-node__dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-bg);
    border: 2px solid var(--color-text);
    transition: all var(--transition-fast);
    z-index: 1;
}

.timeline-node--current .timeline-node__dot {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.timeline-node__pulse {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-accent);
    opacity: 0.3;
    animation: timeline-pulse 2s ease-in-out infinite;
}

@keyframes timeline-pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.3;
    }
    50% {
        transform: scale(1.5);
        opacity: 0;
    }
}

/* Content card */
.timeline-content {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: var(--spacing-md);
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.timeline-content:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.timeline-content__link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.timeline-content__title {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

.timeline-content:hover .timeline-content__title {
    color: var(--color-accent);
}

.timeline-content__subtitle {
    font-family: var(--font-primary);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0 0 var(--spacing-xs) 0;
}

.timeline-content__dates {
    display: inline-block;
    font-family: var(--font-primary);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

.timeline-content__description {
    font-family: var(--font-primary);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: var(--spacing-sm) 0 0 0;
    line-height: 1.5;
}

/* Mobile: single column */
@media (max-width: 768px) {
    .timeline-line {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        padding-left: calc(40px + var(--spacing-md));
        padding-right: var(--spacing-sm);
        text-align: left;
    }

    .timeline-item--left,
    .timeline-item--right {
        left: 0;
        padding-left: calc(40px + var(--spacing-md));
        padding-right: var(--spacing-sm);
        text-align: left;
    }

    .timeline-item--left .timeline-node,
    .timeline-item--right .timeline-node {
        left: 12px;
        right: auto;
    }
}