/* ========================================== */
/* BASE & RESET */
/* ========================================== */
.heritage-timeline {
    overflow: hidden;
    position: relative;
}

/* ========================================== */
/* SPATIAL TAB MENU (BEM Naming & Auto Hide) */
/* ========================================== */
.timeline-nav {
    position: fixed;
    top: 50%;
    left: 15px;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 100;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 20px;
    border-radius: 20px;
    border: 1px solid rgba(0, 0, 0, 0.03);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.04);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    width: 250px;
    display: none;
}

.timeline-nav.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.timeline-nav__btn {
    background: transparent;
    border: none;
    text-align: left;
    padding: 12px 16px;
    cursor: pointer;
    color: #a3a3a3;
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.4s ease;
    border-left: 2px solid transparent;
    outline: none;
}
.timeline-nav__btn:hover {
    color: #010101;
    padding-left: 20px;
}
.timeline-nav__btn--active {
    color: #010101;
    border-left: 2px solid var(--blue-heading);
    padding-left: 20px;
}

/* ========================================== */
/* TIMELINE CANVAS */
/* ========================================== */
.timeline {
    position: relative;
    width: 1200px;
    height: 3200px;
    margin: 0 auto;
}
.timeline__svg-desktop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}
.timeline__path-base {
    fill: none;
    stroke: rgba(0, 0, 0, 0.04);
    stroke-width: 2;
}
.timeline__path-glow {
    fill: none;
    stroke: url(#grad);
    stroke-width: 3.5;
    filter: drop-shadow(0 0 10px rgba(48, 122, 189, 0.5));
    stroke-linecap: round;
}
.timeline__mobile-line {
    display: none;
}

/* ========================================== */
/* TIMELINE ITEMS */
/* ========================================== */
.timeline__item {
    position: absolute;
    top: var(--d-top);
    left: 0;
    width: 100%;
    z-index: 5;
}

.timeline__node {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: #ffffff;
    color: #4279bc;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 900;
    letter-spacing: 1px;
    cursor: pointer;
    transform: translate(-50%, -50%);
    transition: all 0.4s ease;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border: 2px solid #4279bc;
    z-index: 10;
    top: 0;
}
.timeline__node.is-active
 {
    background: #4279bc;
    color: #ffffff;
    transform: translate(-50%, -50%) scale(1.15);
    box-shadow: 0 15px 30px rgb(18 18 18 / 45%);
}

.timeline__card {
    position: absolute;
    width: 340px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 1);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.08);
    opacity: 0;
    z-index: 5;
    top: 0;
    transform: translateY(40px);
}

/* Internal Card Elements */
.timeline__tag {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.timeline__tag-line {
    width: 24px;
    height: 2px;
    background: var(--blue-heading);
}
.timeline__tag-text {
    font-size: 9px;
    letter-spacing: 2px;
    text-transform: uppercase;
    /* color: #a3a3a3; */
    font-weight: 900;
}
.timeline__title {
    font-size: 24px;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
    line-height: 1.2;
    color: var(--black-color);
}
.timeline__desc {
    color: #737373;
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

/* Desktop Modifiers */
.timeline__item--right .timeline__node {
    left: 900px;
}
.timeline__item--right .timeline__card {
    left: 520px;
}

.timeline__item--left .timeline__node {
    left: 300px;
}
.timeline__item--left .timeline__card {
    left: 340px;
}

@media (max-width: 1601px) {
    .timeline__node {
    width: 85px;
    height: 85px;
}
}



/* ========================================== */
/* RESPONSIVE: TABLET & MOBILE */
/* ========================================== */
@media (max-width: 992px) {
    .timeline {
        width: 100%;
        height: auto;
        padding: 40px 20px 100px 20px;
    }
    .timeline__svg-desktop {
        display: none;
    }

    /* Mobile Progress Line */
    .timeline__mobile-line {
        display: block;
        position: absolute;
        left: 48px;
        top: 0;
        bottom: 0;
        width: 3px;
        background: rgba(0, 0, 0, 0.05);
        z-index: 0;
    }
    .timeline__mobile-draw {
        width: 100%;
        height: 0%;
        background: linear-gradient(to bottom, var(--blue-heading), #307abd);
        box-shadow: 0 0 10px rgba(48, 122, 189, 0.5);
    }

    /* Standard Flex Flow for Cards */
    .timeline__item {
        position: relative;
        top: auto;
        margin-bottom: 60px;
        padding-left: 70px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        min-height: 100px;
    }

    /* Reset left/right modifiers for vertical layout */
    .timeline__item--right .timeline__node,
    .timeline__item--left .timeline__node {
        left: 28px;
        top: 50%;
    }
    .timeline__node:hover {
        transform: translate(-50%, -50%) scale(1.1);
    }

    .timeline__item--right .timeline__card,
    .timeline__item--left .timeline__card {
        position: relative;
        top: auto;
        left: 0;
        width: 100%;
        transform: translateY(20px);
    }

    /* Transform Tab Menu into a Bottom App Bar */
    .timeline-nav {
        top: auto;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - 40px);
        flex-direction: row;
        overflow-x: auto;
        padding: 12px;
        border-radius: 100px;
        -ms-overflow-style: none;
        scrollbar-width: none;
    }
    .timeline-nav::-webkit-scrollbar {
        display: none;
    }
    .timeline-nav__btn {
        white-space: nowrap;
        border-left: none;
        border-bottom: 2px solid transparent;
        padding: 8px 12px;
    }
    .timeline-nav__btn:hover {
        padding-left: 12px;
        border-bottom: 2px solid var(--blue-heading);
    }
    .timeline-nav__btn--active {
        padding-left: 12px;
        border-left: none;
        border-bottom: 2px solid var(--blue-heading);
    }

        .timeline__node {
        width: 60px;
        height: 60px;
        font-size: 16px;
    }
}