:root {
    --bg-primary: #f8fafc;
    --bg-surface: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --color-primary: #0f172a; /* Deep Slate Academic Blue */
    --color-accent: #d97706;  /* Premium Academic Amber Gold */
    --color-accent-hover: #b45309;
    --border-color: #e2e8f0;
}

/* --- Two-Column Layout Timeline --- */
.timeline-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.timeline-column h3 {
    font-size: 18px;
    color: var(--color-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.timeline-list {
    list-style: none;
    position: relative;
    padding-left: 20px;
    border-left: 2px solid var(--border-color);
}

.timeline-list li {
    margin-bottom: 30px;
    position: relative;
}

.timeline-list li::before {
    content: '';
    position: absolute;
    left: -27px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-accent);
    border: 3px solid #fff;
}

.time-period {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: var(--color-accent);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.timeline-list strong {
    display: block;
    font-size: 15px;
    color: var(--color-primary);
    line-height: 1.4;
}

.org {
    display: block;
    font-size: 13.5px;
    color: var(--text-muted);
    margin-top: 4px;
}