/* Timeline / Chronologie Page Styles (BEM: .timeline) */

/* Variables & Styles */
:root {
    --t-line-color: var(--c-white-60);
    --t-cursor-color: var(--c-text);
    --t-card-bg: var(--glass-border);
    --t-card-border: var(--c-accent-20);
    --t-gap: 40px;
}

/* Layout */
.timeline {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px 100px 20px;
    color: var(--c-text);
    font-family: var(--font-main);
    /* Anti-FOUC: masquer initialement et révéler avec animation */
    opacity: 0;
    animation: timelineReveal 0.6s ease-out 0.1s forwards;
}

@keyframes timelineReveal {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.timeline__header {
    text-align: center;
    padding: 100px 0 80px 0;
    margin-top: 60px;
    position: relative;
    z-index: var(--z-level-1);
}

.timeline__title {
    font-size: clamp(1.8rem, 4vw, 3.3rem);
    margin-bottom: 0.5rem;
    font-weight: 300;
    color: var(--c-text);
    font-family: var(--font-main);
    letter-spacing: 2px;
}

.timeline__description {
    opacity: 0.8;
    font-style: italic;
}

/* Grid System */
.timeline__grid {
    display: grid;
    grid-template-columns: 1fr 6px 1fr;
    position: relative;
    gap: 0;
    padding-bottom: 50vh;
}

/* Ligne verticale centrale */
.timeline__grid::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: calc(50vh - 100px);
    left: 50%;
    width: 2px;
    background: var(--c-white-60);
    transform: translateX(-50%);
    box-shadow: 0 0 8px var(--c-white-30);
    z-index: var(--z-back);
    pointer-events: none;
    -webkit-mask-image: linear-gradient(to bottom, black 0%, black calc(100% - 100px), transparent 100%);
    mask-image: linear-gradient(to bottom, black 0%, black calc(100% - 100px), transparent 100%);
}

.timeline__track-col {
    display: none;
}

/* Curseur lumineux */
.timeline__cursor {
    position: absolute;
    top: 0;
    left: 50%;
    width: 16px;
    height: 16px;
    background: #fff;
    border-radius: var(--radius-round);
    transform: translate(-50%, -50%);
    box-shadow: 0 0 15px #fff, 0 0 30px var(--c-white-90), 0 0 50px var(--c-white-50);
    z-index: var(--z-level-2);
    pointer-events: none;
    transition: top 0.05s linear;
}

/* Années */
.timeline__row--year {
    grid-column: 1 / 2;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding-right: var(--t-gap);
    margin: 60px 0 30px 0;
    z-index: var(--z-canvas);
}

.timeline__year-label {
    background: transparent;
    border: none;
    padding: 0;
    font-family: var(--font-main);
    font-size: clamp(1.5rem, 2.5vw, 2.1rem);
    font-weight: 300;
    font-style: italic;
    color: var(--c-white-80);
    text-shadow: 0 5px 20px var(--c-black-60);
    letter-spacing: 2px;
    opacity: 0;
    transform: scale(0.9);
    transition: opacity var(--duration-reveal), transform var(--duration-reveal);
}

.timeline__year-label.visible {
    opacity: 1;
    transform: scale(1);
}

/* Item Rows */
.timeline__row {
    grid-column: 1 / -1;
    display: contents;
}

/* Gauche */
.timeline__row--left .timeline__content {
    grid-column: 1 / 2;
    padding-right: var(--t-gap);
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    position: relative;
}

.timeline__row--left .timeline__card {
    text-align: right;
}

.timeline__row--left .timeline__spacer {
    grid-column: 3 / 4;
}

.timeline__row--left .timeline__connector {
    right: 0;
    transform-origin: right;
}

.timeline__row--left .timeline__connector::after {
    content: '';
    position: absolute;
    right: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--c-white-80);
    border-radius: 50%;
    box-shadow: 0 0 6px var(--c-white-50);
}

/* Droite */
.timeline__row--right .timeline__content {
    grid-column: 3 / 4;
    padding-left: var(--t-gap);
    text-align: left;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    position: relative;
}

.timeline__row--right .timeline__spacer {
    grid-column: 1 / 2;
}

.timeline__row--right .timeline__connector {
    left: 0;
    transform-origin: left;
}

.timeline__row--right .timeline__connector::after {
    content: '';
    position: absolute;
    left: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--c-white-80);
    border-radius: 50%;
    box-shadow: 0 0 6px var(--c-white-50);
}

/* Connecteurs */
.timeline__connector {
    position: absolute;
    top: 50%;
    width: 0;
    height: 1px;
    background: var(--t-line-color);
    transition: width var(--duration-reveal) ease-out 0.2s;
}

.timeline__card.visible~.timeline__connector,
.timeline__content:has(.timeline__card.visible) .timeline__connector {
    width: var(--t-gap);
}

/* Cards */
.timeline__card {
    background: transparent;
    border: none;
    padding: 10px 0;
    text-decoration: none;
    display: block;
    max-width: 400px;
    width: 100%;
    transition: opacity var(--trans-fast), transform var(--trans-fast);
    opacity: 0;
    transform: translateY(30px);
}

.timeline__card:hover {
    transform: translateY(-3px);
}

.timeline__card:hover .timeline__card-title {
    color: var(--c-text);
    text-shadow: 0 0 20px var(--c-accent-30);
}

.timeline__card.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline__card-title {
    color: var(--c-white-90);
    margin: 0 0 5px 0;
    font-family: var(--font-main);
    font-size: 1.45rem;
    font-weight: 400;
    line-height: 1.3;
    transition: color var(--trans-fast), text-shadow var(--trans-fast);
}

.timeline__card-date {
    display: block;
    font-size: 0.75rem;
    color: var(--c-white-50);
    font-family: var(--font-sans);
    text-transform: none;
    letter-spacing: 0.5px;
    margin-top: 5px;
}

.timeline__row:hover .timeline__connector {
    background: var(--c-white-80);
}

/* Undated Section */
.timeline__undated {
    text-align: center;
    margin-top: 100px;
    border-top: 1px solid var(--t-line-color);
    padding-top: 50px;
}

.undated-pill {
    display: inline-block;
    padding: 5px 15px;
    background: var(--c-white-05);
    border-radius: var(--radius-xl);
    color: var(--c-white-60);
    text-decoration: none;
    margin: 5px;
    font-size: 0.9rem;
    transition: all var(--trans-fast);
}

.undated-pill:hover {
    background: #fff;
    color: #000;
}

/* === MOBILE RESPONSIVE === */
@media (max-width: 768px) {
    .timeline {
        padding: 0 15px 50px 15px;
    }

    .timeline__header {
        padding: 100px 0 40px 0;
        margin-top: 80px;
    }

    .timeline__title {
        font-size: 1.9rem;
    }

    .timeline__grid {
        display: grid;
        grid-template-columns: 80px 0 1fr;
        padding-left: 0;
        border-left: none;
        padding-bottom: 50vh;
        position: relative;
    }

    .timeline__grid::before {
        content: '';
        position: absolute;
        left: 80px;
        top: 0;
        bottom: calc(50vh - 100px);
        width: 2px;
        background: var(--c-white-40);
        display: block;
        -webkit-mask-image: linear-gradient(to bottom, black 0%, black calc(100% - 100px), transparent 100%);
        mask-image: linear-gradient(to bottom, black 0%, black calc(100% - 100px), transparent 100%);
    }

    .timeline__track-col,
    .timeline__spacer {
        display: none;
    }

    .timeline__grid .timeline__cursor {
        display: block;
        left: 80px;
        transform: translate(-50%, -50%);
    }

    .timeline__row--year {
        display: contents;
    }

    .timeline__year-label {
        grid-column: 1 / 2;
        font-size: 1.2rem;
        opacity: 1;
        transform: none;
        display: flex;
        align-items: center;
        justify-content: flex-end;
        padding-right: 15px;
        background: none;
        margin: 30px 0 15px 0;
        position: relative;
        left: auto;
        width: 100%;
    }

    .timeline__row,
    .timeline__row--left,
    .timeline__row--right {
        display: contents;
    }

    .timeline__content,
    .timeline__row--left .timeline__content,
    .timeline__row--right .timeline__content {
        grid-column: 3 / 4;
        padding: 0 0 0 15px;
        text-align: left;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        position: relative;
    }

    .timeline__card {
        display: block;
        width: 100%;
        max-width: none;
        opacity: 0;
        transform: translateY(30px);
        padding: 10px 0;
    }

    .timeline__card.visible {
        opacity: 1;
        transform: translateY(0);
    }

    .timeline__row--left .timeline__card,
    .timeline__row--right .timeline__card {
        text-align: left;
    }

    .timeline__card-title {
        font-size: 1.1rem;
    }

    .timeline__connector {
        display: block;
        position: absolute;
        left: 80px;
        top: 50%;
        width: 0;
        height: 1px;
        background: var(--c-white-40);
        transform: translateY(-50%);
        transition: width var(--duration-reveal) ease-out 0.2s;
    }

    .timeline__card.visible~.timeline__connector,
    .timeline__content:has(.timeline__card.visible) .timeline__connector {
        width: 15px;
    }

    .timeline__connector::after,
    .timeline__row--left .timeline__connector::after,
    .timeline__row--right .timeline__connector::after {
        content: '';
        position: absolute;
        left: -4px;
        right: auto;
        top: 50%;
        transform: translateY(-50%);
        width: 8px;
        height: 8px;
        background: var(--c-white-80);
        border-radius: 50%;
        box-shadow: 0 0 6px var(--c-white-50);
        display: block;
    }
}