/* ============================================
   PORTFOLIO - EXPERIENCE PAGE
   Module 9: alternating timeline, dots, dates
   Loaded only on the experience page.
   ============================================ */

/* ----------------------------------------
   1. TIMELINE SHELL
   ---------------------------------------- */
.timeline {
    position: relative;
    max-width: 980px;
    margin: 0 auto;
}

/* Faint track line */
.timeline::before {
    content: '';
    position: absolute;
    top: 8px;
    bottom: 8px;
    left: 50%;
    width: 2px;
    transform: translateX(-50%);
    background: linear-gradient(180deg, transparent, var(--surface-border-strong) 8%, var(--surface-border-strong) 92%, transparent);
    border-radius: var(--radius-pill);
}

/* Bright fill line drawn as you scroll (scaled in experience.js) */
.timeline-fill {
    position: absolute;
    top: 8px;
    bottom: 8px;
    left: 50%;
    width: 2px;
    transform: translateX(-50%) scaleY(0);
    transform-origin: top;
    background: linear-gradient(180deg, var(--primary), var(--secondary), var(--accent));
    border-radius: var(--radius-pill);
    box-shadow: 0 0 12px color-mix(in srgb, var(--primary) 55%, transparent);
    will-change: transform;
}

/* Alternating rows */
.timeline-item {
    position: relative;
    width: 50%;
    padding: 0 48px 40px 0;
}

.timeline-item.is-right {
    margin-left: 50%;
    padding: 0 0 40px 48px;
}

/* ---- Dot on the line ---- */
.timeline-dot {
    position: absolute;
    top: 12px;
    right: -9px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 3px solid var(--exp-color, var(--primary));
    box-shadow: 0 0 0 4px var(--bg-surface);
    z-index: 2;
    transition: background-color var(--transition-fast), box-shadow var(--transition-base);
}

.timeline-item.is-right .timeline-dot {
    right: auto;
    left: -9px;
}

.timeline-item:hover .timeline-dot {
    background: var(--exp-color, var(--primary));
    box-shadow: 0 0 0 4px var(--bg-surface), 0 0 16px 4px color-mix(in srgb, var(--exp-color, var(--primary)) 60%, transparent);
}

/* Half-size pulse ring around the dot */
.timeline-dot::after {
    content: '';
    position: absolute;
    inset: -7px;
    border-radius: 50%;
    border: 2px solid color-mix(in srgb, var(--exp-color, var(--primary)) 55%, transparent);
    animation: ring-pulse 2.4s var(--ease-out) infinite;
}

@keyframes ring-pulse {
    0%   { transform: scale(0.55); opacity: 1; }
    70%  { transform: scale(1.5);  opacity: 0; }
    100% { transform: scale(1.5);  opacity: 0; }
}

/* ----------------------------------------
   2. TIMELINE CARD
   ---------------------------------------- */
.timeline-card {
    position: relative;
    overflow: hidden;
    padding: var(--space-5);
    transition: transform var(--transition-spring), box-shadow var(--transition-base);
}

.timeline-item:hover .timeline-card {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

/* Tinted gradient ring shimmer on hover */
.timeline-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--exp-color), var(--secondary), transparent);
    opacity: 0.45;
    transition: opacity var(--transition-base);
}

.timeline-item:hover .timeline-card::before {
    opacity: 1;
}

/* ---- Date chip ---- */
.timeline-date {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--exp-color, var(--primary-light));
    background: color-mix(in srgb, var(--exp-color, var(--primary)) 12%, var(--bg-card));
    border: 1px solid color-mix(in srgb, var(--exp-color, var(--primary)) 28%, transparent);
    border-radius: var(--radius-pill);
    padding: 0.35rem 0.9rem;
    margin-bottom: var(--space-4);
    transition: background-color var(--transition-fast), color var(--transition-fast),
                transform var(--transition-fast);
}

.timeline-item:hover .timeline-date {
    background: var(--exp-color, var(--primary));
    color: #fff;
    transform: translateY(-2px);
}

/* ---- Company & role ---- */
.timeline-company {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--fs-lg);
    margin-bottom: var(--space-1);
}

.timeline-location {
    font-size: var(--fs-sm);
    font-weight: var(--fw-normal);
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.timeline-role {
    color: var(--exp-color, var(--primary-light));
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    margin-bottom: var(--space-3);
}

.timeline-card .card-text {
    margin-bottom: var(--space-4);
}

/* ---- Tags ---- */
.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.timeline-tag {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--text-secondary);
    background: var(--bg-surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-sm);
    padding: 0.2rem 0.6rem;
    transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-tag {
    color: var(--exp-color, var(--primary-light));
    border-color: color-mix(in srgb, var(--exp-color, var(--primary)) 45%, transparent);
}

/* ----------------------------------------
   3. RESPONSIVE
   ---------------------------------------- */
@media (max-width: 767.98px) {
    .timeline::before {
        left: 18px;
        transform: translateX(0);
    }

    .timeline-fill {
        left: 19px;
    }

    .timeline-item,
    .timeline-item.is-right {
        width: 100%;
        margin-left: 0;
        padding: 0 0 40px 52px;
    }

    .timeline-item .timeline-dot {
        right: auto;
        left: 9px;
    }

    .timeline-item.is-right .timeline-dot {
        left: 9px;
    }
}

/* ----------------------------------------
   4. REDUCED MOTION
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .timeline-dot::after {
        animation: none;
        transform: scale(1);
        opacity: 0;
    }

    .timeline-card,
    .timeline-date {
        transition: none;
    }
}