/* ----- carbon_content-wrapper ----- */
    .carbon_content-wrapper {
        --timeline-bg-color: #f4f6fa;
        --story-border-width: 2px;
        --story-border-color: #b0c4de;
        --year-color: #000;
        --year-font-size: 2.75vw;
        --year-font-family: Georgia, 'Times New Roman', serif;
        --font-san-serif: 'Helvetica Neue', 'roboto', sans-serif;
        --main-timeline-width: 85vw;
        --main-timeline-max-width: 1800px;
        --content-bg-color: #ffffff;
        --text-color: #1e1e2a;
        --accent-color: #2c5f8a;
        --card-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
        --card-hover: 0 18px 36px rgba(0, 0, 0, 0.12);

        font-family: 'Morion', Georgia, 'Times New Roman', serif;
        background-color: var(--timeline-bg-color);
        color: var(--text-color);
        line-height: 1.6;
        overflow-x: hidden;
        min-height: 100vh;
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    .carbon_content-wrapper * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    .carbon_content-wrapper .header {
        text-align: center;
        padding: 120px 20px 52px;
        background: linear-gradient(145deg, #ffffff, #eef2f7);
        margin-bottom: 20px;
        border-bottom: 2px solid var(--accent-color);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
    }

    .carbon_content-wrapper .header h1 {
        font-size: 3rem;
        background: linear-gradient(135deg, #1e2b3a, #2c5f8a);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
        letter-spacing: 1px;
        text-transform: uppercase;
        margin-bottom: 8px;
        font-weight: 600;
    }

    .carbon_content-wrapper .header h2 {
        font-size: 2rem;
        color: #2c3e50;
        font-weight: 400;
        margin-bottom: 16px;
        letter-spacing: 0.5px;
        font-style: italic;
    }

    .carbon_content-wrapper .header .byline {
        font-size: 0.95rem;
        color: #5d7188;
        margin-bottom: 20px;
        font-weight: 500;
        letter-spacing: 0.3px;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 12px;
        font-family: var(--font-san-serif);
    }

    .carbon_content-wrapper .header .byline .author {
        color: #2c5f8a;
        font-weight: 500;
    }

    .carbon_content-wrapper .header .byline .separator {
        color: #b0c4de;
    }

    .carbon_content-wrapper .header .byline .date {
        color: #7a8a9e;
        font-weight: 500;
    }

    .carbon_content-wrapper .header .intro {
        font-size: 1.1875rem;
        color: #4a5b6e;
        max-width: 760px;
        margin: 0 auto;
        line-height: 1.75rem;
        font-weight: 300;
        padding-top: 8px;
        border-top: 1px solid #e2eaf2;
        margin-top: 8px;
    }

    .carbon_content-wrapper .parent-timeline-container {
        width: 100vw;
        height: auto;
        display: flex;
        justify-content: center;
        padding: 40px 0 60px;
        position: relative;
        background-color: var(--timeline-bg-color);
        background-image: 
            radial-gradient(circle at 10% 20%, rgba(44, 95, 138, 0.03) 0%, transparent 30%),
            radial-gradient(circle at 90% 80%, rgba(165, 42, 42, 0.03) 0%, transparent 30%);
    }

    .carbon_content-wrapper .main-timeline-container {
        width: var(--main-timeline-width);
        max-width: var(--main-timeline-max-width);
        position: relative;
        list-style: none;
        padding: 20px 0;
    }

    .carbon_content-wrapper .timeline-line {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        width: 4px;
        background: #d0dae8;
        top: 0;
        bottom: 0;
        z-index: 1;
        border-radius: 2px;
        overflow: hidden;
        box-shadow: 0 0 8px rgba(44, 95, 138, 0.1);
    }

    .carbon_content-wrapper .timeline-progress {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 0;
        background: linear-gradient(to bottom, var(--accent-color), #b8735c);
        transition: height 0.15s ease-out;
        border-radius: 2px;
    }

    /* --- Timeline items: ALL items get full treatment (touch the timeline) --- */
    .carbon_content-wrapper .main-timeline-container li {
        margin-bottom: 100px;
        position: relative;
        z-index: 2;
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }

    .carbon_content-wrapper .main-timeline-container li.visible {
        opacity: 1;
        transform: translateY(0);
    }

    /* Every item uses the same alternating layout and touches the timeline */
    .carbon_content-wrapper .odd-timeline-item {
        display: flex;
        justify-content: flex-start;
        padding-right: 50%;
    }

    .carbon_content-wrapper .even-timeline-item {
        display: flex;
        justify-content: flex-end;
        padding-left: 50%;
    }

    /* --- Year badge: only shown on primary items, positioned on the timeline --- */
    .carbon_content-wrapper .year-span {
        position: absolute;
        top: 0;
        font-family: var(--year-font-family);
        font-weight: bold;
        color: #ffffff;
        font-size: var(--year-font-size);
        z-index: 3;
        transition: all 0.4s ease;
        background-color: var(--year-color);
        padding: 8px 30px 8px 24px;
        border-radius: 12px;
        border: 2px solid rgba(255, 255, 255, 0.15);
        box-shadow: 0 8px 20px rgba(165, 42, 42, 0.3);
        text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }

    /* Circular marker on top-right corner of the year block */
    .carbon_content-wrapper .year-span::after {
        content: '';
        position: absolute;
        top: -10px;
        right: -10px;
        width: 22px;
        height: 22px;
        background-color: #ffffff;
        border: 3px solid var(--year-color);
        border-radius: 50%;
        box-shadow: 0 0 10px rgba(165, 42, 42, 0.5);
        transition: all 0.4s ease;
        z-index: 5;
    }

    .carbon_content-wrapper .odd-timeline-item .year-span {
        left: 50%;
        transform: translateX(30px);
    }

    .carbon_content-wrapper .even-timeline-item .year-span {
        right: 50%;
        transform: translateX(-30px);
    }

    .carbon_content-wrapper .odd-timeline-item .year-span::after {
        right: auto;
        left: -10px;
    }

    .carbon_content-wrapper .even-timeline-item .year-span::after {
        left: auto;
        right: -10px;
    }

    .carbon_content-wrapper .year-span.active {
        transform: translateX(0) scale(1.05);
        background-color: #000;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
        border-color: rgba(255, 255, 255, 0.4);
    }

    .carbon_content-wrapper .year-span.active::after {
        background-color: var(--year-color);
        border-color: #ffffff;
        transform: scale(1.2);
    }

    /* --- "Same year" mini-label used on secondary cards to signal shared year --- */
    .carbon_content-wrapper .same-year-tag {
        display: inline-block;
        font-size: 0.7rem;
        letter-spacing: 0.8px;
        text-transform: uppercase;
        color: #7a8a9e;
        background: #eef2f7;
        padding: 3px 10px;
        border-radius: 12px;
        margin-bottom: 10px;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        font-weight: 600;
    }

    .carbon_content-wrapper .timeline-content {
        width: 90%;
        background-color: var(--content-bg-color);
        border-radius: 16px;
        padding: 24px 28px;
        box-shadow: var(--card-shadow);
        border: 1px solid #e8edf5;
        position: relative;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        color: #1e2b3a;
    }

    .carbon_content-wrapper .timeline-content:hover {
        transform: translateY(-4px);
        box-shadow: var(--card-hover);
    }

    .carbon_content-wrapper .timeline-content h2 {
        font-size: 1.8rem;
        margin-bottom: 12px;
        color: #1e2b3a;
        border-bottom: 1px solid #e0e7ef;
        padding-bottom: 10px;
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .carbon_content-wrapper .timeline-content p {
        color: #2d3f54;
        margin-bottom: 16px;
        font-size: 1rem;
    }

    .carbon_content-wrapper .media-wrapper {
        margin: 16px 0 12px;
        border-radius: 12px;
        overflow: hidden;
        background: #f0f4fa;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .carbon_content-wrapper .media-wrapper img,
    .carbon_content-wrapper .media-wrapper video {
        display: block;
        width: 100%;
        height: auto;
        object-fit: contain;
        transition: transform 0.3s ease;
        background: #f0f4fa;
    }

    .carbon_content-wrapper .media-wrapper img:hover,
    .carbon_content-wrapper .media-wrapper video:hover {
        transform: scale(1.01);
    }

    .carbon_content-wrapper .media-caption {
        font-size: 0.85rem;
        color: #5d7188;
        padding: 10px 14px;
        background: #f9fcff;
        border-top: 1px solid #e2eaf2;
        text-align: left;
        width: 100%;
        font-style: italic;
        line-height: 1.4;
    }

    .carbon_content-wrapper .timeline-marker {
        display: none;
    }

    .carbon_content-wrapper .end-of-era {
        display: flex;
        justify-content: center;
        align-items: center;
        margin-top: 40px;
        margin-bottom: 60px;
        position: relative;
        z-index: 3;
    }

    .carbon_content-wrapper .end-of-era .era-badge {
        background-color: #000;
        color: #ffffff;
        font-family: var(--year-font-family);
        font-weight: bold;
        font-size: 2.5rem;
        padding: 16px 48px;
        border-radius: 16px;
        border: 3px solid #ffffff;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
        text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
        position: relative;
        letter-spacing: 1px;
        transition: transform 0.3s ease;
        text-align: center;
        white-space: nowrap;
    }

    .carbon_content-wrapper .end-of-era .era-badge:hover {
        transform: scale(1.02);
    }

    .carbon_content-wrapper .end-of-era .era-badge::after {
        content: '';
        position: absolute;
        top: -16px;
        left: 50%;
        transform: translateX(-50%);
        width: 28px;
        height: 28px;
        background-color: #ffffff;
        border: 4px solid #000;
        border-radius: 50%;
        box-shadow: 0 0 15px rgba(255, 255, 255, 0.6);
        z-index: 5;
    }

    .carbon_content-wrapper .timeline-footer {
        text-align: center;
        padding: 40px 20px 30px;
        border-top: 1px solid #e2eaf2;
        margin-top: 20px;
        background-color: var(--timeline-bg-color);
    }

    .carbon_content-wrapper .timeline-footer .credit {
        font-size: 0.95rem;
        color: #7a8a9e;
        letter-spacing: 0.5px;
        font-weight: 400;
        font-family: var(--font-san-serif);
    }

    .carbon_content-wrapper .timeline-footer .credit .dev {
        color: #2c5f8a;
        font-weight: 600;
    }

    .carbon_content-wrapper .timeline-footer .credit .sep {
        color: #b0c4de;
        margin: 0 8px;
    }

    .carbon_content-wrapper .scroll-indicator {
        position: fixed;
        bottom: 30px;
        right: 30px;
        background-color: #ffffff;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        color: var(--accent-color);
        z-index: 100;
        cursor: pointer;
        box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
        transition: all 0.3s ease;
        opacity: 0;
        visibility: hidden;
        border: 1px solid #dde5ef;
    }

    .carbon_content-wrapper .scroll-indicator.visible {
        opacity: 1;
        visibility: visible;
    }

    .carbon_content-wrapper .scroll-indicator:hover {
        background-color: var(--accent-color);
        color: white;
        transform: scale(1.08);
    }

    .carbon_content-wrapper .progress-container {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background-color: #e2eaf2;
        z-index: 101;
    }

    .carbon_content-wrapper .progress-bar {
        height: 100%;
        background: linear-gradient(to right, var(--accent-color), #b8735c);
        width: 0;
        transition: width 0.15s ease;
    }

    @media (max-width: 900px) {
        .carbon_content-wrapper .odd-timeline-item,
        .carbon_content-wrapper .even-timeline-item {
            padding-left: 0;
            padding-right: 0;
            justify-content: center;
            flex-direction: column;
            align-items: center;
        }

        .carbon_content-wrapper .odd-timeline-item .year-span,
        .carbon_content-wrapper .even-timeline-item .year-span {
            position: relative;
            left: auto;
            right: auto;
            transform: none;
            margin-bottom: 16px;
            display: inline-block;
            font-size: 2rem;
            padding: 6px 24px;
            background: var(--year-color);
            border: 2px solid rgba(255, 255, 255, 0.2);
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
        }

        .carbon_content-wrapper .year-span::after {
            top: -8px;
            left: 50% !important;
            right: auto !important;
            transform: translateX(-50%) !important;
            width: 18px;
            height: 18px;
        }

        .carbon_content-wrapper .year-span.active {
            transform: scale(1.02);
        }

        .carbon_content-wrapper .timeline-content {
            width: 92%;
            margin: 0 auto;
        }

        .carbon_content-wrapper .timeline-line {
            opacity: 0.4;
        }

        .carbon_content-wrapper .header h1 {
            font-size: 2.5rem;
        }

        .carbon_content-wrapper .header h2 {
            font-size: 1.2rem;
        }

        .carbon_content-wrapper .header .intro {
            font-size: 1rem;
            padding-left: 16px;
            padding-right: 16px;
        }

        .carbon_content-wrapper .end-of-era .era-badge {
            font-size: 1.8rem;
            padding: 12px 32px;
            white-space: normal;
            max-width: 90vw;
        }

        .carbon_content-wrapper .end-of-era .era-badge::after {
            top: -14px;
            width: 24px;
            height: 24px;
            border-width: 3px;
        }
    }

    @media (max-width: 600px) {
        .carbon_content-wrapper .header h1 {
            font-size: 2rem;
        }

        .carbon_content-wrapper .header h2 {
            font-size: 1.1rem;
        }

        .carbon_content-wrapper .header .byline {
            flex-direction: column;
            gap: 4px;
            font-size: 0.85rem;
        }

        .carbon_content-wrapper .header .byline .separator {
            display: none;
        }

        .carbon_content-wrapper .header .intro {
            font-size: 0.95rem;
        }

        .carbon_content-wrapper .year-span {
            font-size: 1.6rem !important;
            padding: 4px 20px !important;
        }

        .carbon_content-wrapper .timeline-content {
            padding: 20px 18px;
            width: 96%;
        }

        .carbon_content-wrapper .timeline-content h2 {
            font-size: 1.4rem;
        }

        .carbon_content-wrapper .media-caption {
            font-size: 0.8rem;
            padding: 8px 10px;
        }

        .carbon_content-wrapper .end-of-era .era-badge {
            font-size: 1.4rem;
            padding: 10px 24px;
        }

        .carbon_content-wrapper .end-of-era .era-badge::after {
            top: -12px;
            width: 20px;
            height: 20px;
            border-width: 3px;
        }

        .carbon_content-wrapper .timeline-footer .credit {
            font-size: 0.85rem;
        }

        .carbon_content-wrapper .timeline-footer .credit .sep {
            display: none;
        }
    }

    @media (min-width: 901px) {
        .carbon_content-wrapper .year-span {
            font-size: var(--year-font-size);
        }
    }