/* ============================================================
   📜 TIMELINE — Scroll Storytelling
   Líneas de tiempo animadas con Intersection Observer
   ============================================================ */

/* ─── Contenedor base ─────────────────────────────────────── */
.av-timeline {
    position: relative;
    padding: var(--av-space-2xl) 0;
}

/* Línea vertical central (conector) */
.av-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        var(--av-color-border) 5%,
        var(--av-color-border) 95%,
        transparent 100%
    );
}

/* ─── Cada ítem de la timeline ────────────────────────────── */
.av-timeline-item {
    display: flex;
    align-items: flex-start;
    justify-content: flex-end;
    position: relative;
    margin-bottom: 80px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.av-timeline-item:last-child {
    margin-bottom: 0;
}

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

.av-timeline-item:nth-child(odd) {
    flex-direction: row;
    padding-right: calc(50% + 40px);
    text-align: right;
}

.av-timeline-item:nth-child(even) {
    flex-direction: row-reverse;
    padding-left: calc(50% + 40px);
    text-align: left;
}

/* ─── Punto en la línea central ───────────────────────────── */
.av-timeline-dot {
    position: absolute;
    left: 50%;
    top: 8px;
    transform: translateX(-50%);
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--av-color-accent);
    border: 3px solid var(--av-color-bg);
    box-shadow: 0 0 0 2px var(--av-color-accent);
    z-index: 2;
    transition: transform 0.4s ease, background 0.4s ease;
}

.av-timeline-item.is-visible .av-timeline-dot {
    transform: translateX(-50%) scale(1.2);
    background: var(--av-color-accent-hover);
    box-shadow: 0 0 0 3px var(--av-color-accent-hover);
}

/* ─── Contenido del ítem ──────────────────────────────────── */
.av-timeline-content {
    flex: 0 0 40%;
    background: var(--av-color-blanco);
    border-radius: var(--av-radius-md);
    padding: var(--av-space-lg) var(--av-space-xl);
    box-shadow: var(--av-shadow-sm);
    border: 1px solid var(--av-color-border);
    transition: box-shadow 0.4s ease, transform 0.4s ease;
    position: relative;
}

.av-timeline-content:hover {
    box-shadow: var(--av-shadow-md);
    transform: translateY(-2px);
}

.av-timeline-content::after {
    content: '';
    position: absolute;
    top: 12px;
    width: 12px;
    height: 12px;
    background: var(--av-color-blanco);
    border: 1px solid var(--av-color-border);
    transform: rotate(45deg);
    z-index: 1;
}

.av-timeline-item:nth-child(odd) .av-timeline-content::after {
    right: -7px;
    border-left: none;
    border-bottom: none;
}

.av-timeline-item:nth-child(even) .av-timeline-content::after {
    left: -7px;
    border-right: none;
    border-top: none;
}

/* ─── Fecha del evento ────────────────────────────────────── */
.av-timeline-date {
    font-family: var(--av-font-mono);
    font-size: 0.6rem;
    color: var(--av-color-accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    display: block;
    margin-bottom: var(--av-space-sm);
}

/* ─── Título del evento ───────────────────────────────────── */
.av-timeline-title {
    font-family: var(--av-font-heading);
    font-size: var(--av-text-base);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin: 0 0 var(--av-space-sm);
    line-height: 1.3;
}

/* ─── Descripción ─────────────────────────────────────────── */
.av-timeline-desc {
    font-size: var(--av-text-sm);
    color: var(--av-color-muted);
    line-height: 1.6;
    margin: 0;
}

/* ─── Media ───────────────────────────────────────────────── */
.av-timeline-media {
    margin-top: var(--av-space-md);
    border-radius: var(--av-radius-sm);
    overflow: hidden;
}

.av-timeline-media img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.6s ease;
}

.av-timeline-media:hover img {
    transform: scale(1.02);
}

.av-timeline-media audio {
    width: 100%;
    margin-top: var(--av-space-sm);
}

.av-timeline-media video {
    width: 100%;
}

/* ─── TIPO: HORIZONTAL ────────────────────────────────────── */
.av-timeline[data-type="horizontal"] {
    overflow-x: auto;
    overflow-y: hidden;
    padding: var(--av-space-2xl) 0;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.av-timeline[data-type="horizontal"]::before {
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: auto;
    height: 2px;
    background: linear-gradient(
        to right,
        transparent 0%,
        var(--av-color-border) 3%,
        var(--av-color-border) 97%,
        transparent 100%
    );
}

.av-timeline[data-type="horizontal"] .av-timeline-track {
    display: flex;
    gap: var(--av-space-xl);
    padding: 0 var(--av-container-padding);
    min-width: min-content;
}

.av-timeline[data-type="horizontal"] .av-timeline-item {
    flex: 0 0 280px;
    flex-direction: column;
    text-align: center;
    padding: 0 !important;
    margin-bottom: 0;
    scroll-snap-align: start;
}

.av-timeline[data-type="horizontal"] .av-timeline-dot {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    margin: 0 auto var(--av-space-md);
}

.av-timeline[data-type="horizontal"] .av-timeline-content {
    flex: none;
    width: 100%;
}

.av-timeline[data-type="horizontal"] .av-timeline-content::after {
    display: none;
}

/* ─── Animaciones de entrada escalonadas ──────────────────── */
.av-timeline-item:nth-child(1) { transition-delay: 0.0s; }
.av-timeline-item:nth-child(2) { transition-delay: 0.1s; }
.av-timeline-item:nth-child(3) { transition-delay: 0.2s; }
.av-timeline-item:nth-child(4) { transition-delay: 0.3s; }
.av-timeline-item:nth-child(5) { transition-delay: 0.4s; }
.av-timeline-item:nth-child(6) { transition-delay: 0.5s; }
.av-timeline-item:nth-child(7) { transition-delay: 0.6s; }
.av-timeline-item:nth-child(8) { transition-delay: 0.7s; }

/* ─── Timeline en sección oscura ──────────────────────────── */
.av-section-dark .av-timeline::before {
    background: linear-gradient(
        to bottom,
        transparent 0%,
        var(--av-color-dark-border) 5%,
        var(--av-color-dark-border) 95%,
        transparent 100%
    );
}

.av-section-dark .av-timeline-content {
    background: #2A2A2A;
    border-color: var(--av-color-dark-border);
}

.av-section-dark .av-timeline-content::after {
    background: #2A2A2A;
    border-color: var(--av-color-dark-border);
}

.av-section-dark .av-timeline-title {
    color: var(--av-color-dark-text);
}

.av-section-dark .av-timeline-desc {
    color: var(--av-color-dark-muted);
}

.av-section-dark .av-timeline-dot {
    border-color: var(--av-color-dark);
}

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

    .av-timeline-item,
    .av-timeline-item:nth-child(odd),
    .av-timeline-item:nth-child(even) {
        flex-direction: column;
        padding: 0 0 0 50px !important;
        text-align: left !important;
    }

    .av-timeline-dot {
        left: 20px;
        top: 6px;
        transform: translateX(-50%);
    }

    .av-timeline-item.is-visible .av-timeline-dot {
        transform: translateX(-50%) scale(1.2);
    }

    .av-timeline-content {
        flex: none;
        width: 100%;
    }

    .av-timeline-content::after {
        display: none;
    }

    .av-timeline-item {
        margin-bottom: 48px;
    }

    .av-timeline[data-type="horizontal"] .av-timeline-item {
        flex: 0 0 220px;
    }
}