/* --- FUNDAMENTALS --- */
    .fb-chair-scope {
        background: #000;
        color: #fff;
        font-family: 'Inter', sans-serif;
        line-height: 1.6;
    }

    .fb-chair-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        box-sizing: border-box;
        margin-top: 50px;
    }

    /* --- HERO --- */
    .fb-chair-hero {
        padding: clamp(80px, 15vh, 180px) 0;
        background: linear-gradient(rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.85)),
            url('') center/cover;
        border-bottom: 5px solid #ffcc00;
        background-attachment: fixed;
    }

    .fb-chair-tag {
        color: #ffcc00;
        font-weight: 800;
        text-transform: uppercase;
        font-size: 11px;
        letter-spacing: 2px;
    }

    .fb-chair-h1 {
        font-size: clamp(2.5rem, 8vw, 4rem);
        font-weight: 900;
        line-height: 1;
        margin: 20px 0;
    }

    .fb-chair-h1 span {
        color: #ffcc00;
    }

    .fb-chair-p {
        max-width: 600px;
        color: #ccc;
        font-size: 1.15rem;
        margin-bottom: 35px;
    }

    .fb-chair-btn-wrap {
        display: flex;
        gap: 15px;
        flex-wrap: wrap;
    }

    .fb-chair-btn-y {
        background: #ffcc00;
        color: #000;
        padding: 16px 35px;
        text-decoration: none;
        font-weight: 800;
        border-radius: 4px;
        transition: 0.3s;
    }

    .fb-chair-btn-w {
        border: 2px solid #fff;
        color: #fff;
        padding: 14px 35px;
        text-decoration: none;
        font-weight: 800;
        border-radius: 4px;
        transition: 0.3s;
    }

    .fb-chair-btn-y:hover {
        background: #fff;
        transform: translateY(-3px);
    }

    /* --- EXPLAINER GRID --- */
    .fb-chair-section {
        padding: clamp(50px, 10vh, 100px) 0;
    }

    .fb-chair-bg-dark {
        background: #0a0a0a;
    }

    .fb-chair-split-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 50px;
        align-items: center;
    }

    @media (min-width: 992px) {
        .fb-chair-split-grid {
            grid-template-columns: 1fr 1fr;
        }
    }

    .fb-chair-title {
        font-size: clamp(2rem, 5vw, 2.8rem);
        font-weight: 800;
        margin-bottom: 25px;
    }

    .fb-chair-title span {
        color: #ffcc00;
    }

    /* Grounding Diagram */
    .fb-chair-ground-box {
        background: #111;
        padding: 25px;
        border-radius: 8px;
        border: 1px solid #222;
        margin-top: 30px;
        text-align: center;
    }

    .fb-chair-level {
        padding: 12px;
        background: #222;
        border-radius: 4px;
        font-weight: 800;
        font-size: 0.8rem;
        border: 1px solid #333;
    }

    .fb-chair-level.active {
        color: #ffcc00;
        border-color: #ffcc00;
    }

    .fb-chair-link {
        height: 20px;
        width: 2px;
        background: #333;
        margin: 5px auto;
    }

    .fb-chair-status {
        margin-top: 15px;
        font-size: 10px;
        color: #666;
        font-weight: 900;
    }

    .fb-chair-img-card {
        position: relative;
        border-radius: 12px;
        overflow: hidden;
        border: 1px solid #333;
    }

    .fb-chair-img {
        width: 100%;
        display: block;
        filter: brightness(0.7);
        transition: 0.5s;
    }

    .fb-chair-img-card:hover .fb-chair-img {
        filter: brightness(1);
        transform: scale(1.05);
    }

    .fb-chair-badge {
        position: absolute;
        bottom: 15px;
        right: 15px;
        background: #ffcc00;
        color: #000;
        padding: 5px 12px;
        font-weight: 900;
        font-size: 10px;
    }

    /* --- FEATURES GRID --- */
    .fb-chair-center-head {
        text-align: center;
        margin-bottom: 50px;
    }

    .fb-chair-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 30px;
    }

    .fb-chair-card {
        background: #111;
        padding: 40px;
        border-radius: 12px;
        border: 1px solid #222;
        transition: 0.4s;
    }

    .fb-chair-icon {
        font-size: 3rem;
        margin-bottom: 20px;
    }

    .fb-chair-card.active {
        border-color: rgba(255, 204, 0, 0.4);
        background: #151515;
    }

    .fb-chair-card:hover {
        transform: translateY(-10px);
        border-color: #ffcc00;
    }

    .fb-chair-card h3 {
        margin-bottom: 15px;
    }

    .fb-chair-card p {
        color: #888;
        font-size: 0.95rem;
    }

    /* --- DUAL INFO PANES --- */
    .fb-chair-dual-pane {
        display: grid;
        grid-template-columns: 1fr;
        gap: 30px;
    }

    @media (min-width: 768px) {
        .fb-chair-dual-pane {
            grid-template-columns: 1fr 1fr;
        }
    }

    .fb-chair-info-box {
        padding: 40px;
        border-radius: 8px;
    }

    .fb-chair-info-box.black-box {
        background: #111;
    }

    .fb-chair-info-box.yellow-box {
        background: #ffcc00;
        color: #000;
    }

    .fb-chair-list,
    .fb-chair-list-dark {
        list-style: none;
        padding: 0;
        margin-top: 25px;
    }

    .fb-chair-list li,
    .fb-chair-list-dark li {
        padding: 10px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        padding-left: 25px;
        position: relative;
        font-weight: 700;
    }

    .fb-chair-list-dark li {
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    }

    .fb-chair-list li::before {
        content: '◈';
        position: absolute;
        left: 0;
        color: #ffcc00;
    }

    .fb-chair-list-dark li::before {
        content: '◈';
        position: absolute;
        left: 0;
        color: #000;
    }

    /* --- RESPONSIVE MOBILE --- */
    @media (max-width: 768px) {
        .fb-chair-hero {
            text-align: center;
        }

        .fb-chair-btn-wrap {
            flex-direction: column;
        }

        .fb-chair-btn-y,
        .fb-chair-btn-w {
            width: 100%;
            text-align: center;
        }

        .fb-chair-title {
            text-align: center;
        }

        .fb-chair-col-visual {
            order: -1;
        }

        /* Image comes first on mobile */
    }