/* --- CORE & TYPOGRAPHY --- */
    .fb-esd-scope {
        background: #000;
        color: #fff;
        font-family: 'Inter', sans-serif;
        line-height: 1.6;
        overflow-x: hidden;
    }

    .fb-esd-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        width: 100%;
        box-sizing: border-box;
        margin-top: 50px;
    }

    /* --- TITLES --- */
    .fb-esd-title {
        font-size: clamp(1.8rem, 5vw, 2.5rem);
        font-weight: 800;
        margin-bottom: 25px;
    }

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

    .fb-esd-header-center {
        text-align: center;
        margin-bottom: 50px;
    }

    /* --- HERO --- */
    .fb-esd-hero {
        padding: clamp(80px, 12vh, 160px) 0;
        background: linear-gradient(135deg, rgba(0, 0, 0, 0.95) 20%, rgba(20, 20, 20, 0.6) 100%),
            url('') center/cover;
        border-bottom: 5px solid #ffcc00;
    }

    .fb-esd-alert {
        color: #ffcc00;
        font-size: 11px;
        font-weight: 900;
        text-transform: uppercase;
        letter-spacing: 2px;
        display: block;
        margin-bottom: 15px;
    }

    .fb-esd-h1 {
        font-size: clamp(2.5rem, 8vw, 4rem);
        font-weight: 900;
        line-height: 1.1;
        margin-bottom: 20px;
    }

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

    .fb-esd-p {
        max-width: 650px;
        color: #bbb;
        font-size: 1.1rem;
        margin-bottom: 35px;
    }

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

    .fb-esd-btn-y {
        background: #ffcc00;
        color: #000;
        padding: 15px 35px;
        text-decoration: none;
        font-weight: 800;
        border-radius: 4px;
        transition: 0.3s;
        text-align: center;
    }

    .fb-esd-btn-w {
        border: 2px solid #fff;
        color: #fff;
        padding: 13px 35px;
        text-decoration: none;
        font-weight: 800;
        border-radius: 4px;
        transition: 0.3s;
        text-align: center;
    }

    .fb-esd-btn-y:hover {
        background: #fff;
    }

    /* --- GROUNDING VISUAL --- */
    .fb-esd-section {
        padding: clamp(50px, 10vh, 100px) 0;
    }

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

    @media (min-width: 992px) {
        .fb-esd-split {
            grid-template-columns: 1.1fr 0.9fr;
        }
    }

    .fb-esd-ground-box {
        margin-top: 30px;
        background: #111;
        border: 1px solid #333;
        padding: 20px;
        border-radius: 8px;
    }

    .fb-esd-layer {
        height: 30px;
        background: #333;
        border-radius: 4px;
        margin-bottom: 5px;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
    }

    .fb-esd-layer.conductive {
        background: #1a1a1a;
        height: 15px;
    }

    .fb-esd-label {
        font-size: 9px;
        font-weight: 900;
        color: #666;
        text-transform: uppercase;
    }

    .fb-esd-wire {
        font-size: 10px;
        color: #ffcc00;
        font-weight: 900;
        margin-top: 15px;
        text-align: right;
    }

    .fb-esd-spark-flow {
        position: absolute;
        width: 10px;
        height: 100%;
        background: #ffcc00;
        filter: blur(5px);
        left: -20px;
        animation: flowSpark 3s infinite linear;
    }

    @keyframes flowSpark {
        0% {
            left: -20px;
        }

        100% {
            left: 100%;
        }
    }

    .fb-esd-resp-img {
        width: 100%;
        border-radius: 8px;
        border: 1px solid #222;
    }

    /* --- CARDS --- */
    .fb-esd-dark-bg {
        background: #080808;
    }

    .fb-esd-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 30px;
    }

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

    .fb-esd-icon-num {
        font-size: 2.5rem;
        font-weight: 900;
        color: rgba(255, 204, 0, 0.1);
        margin-bottom: 10px;
    }

    .fb-esd-card h3 {
        margin-bottom: 15px;
        font-size: 1.4rem;
    }

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

    .fb-esd-card.highlight {
        border-color: #ffcc00;
        background: #151515;
    }

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

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

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

    .fb-esd-info-pane {
        padding: 40px;
        background: #111;
        border-radius: 8px;
    }

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

    .fb-esd-sub {
        margin-bottom: 25px;
        font-weight: 800;
        font-size: 1.5rem;
    }

    .fb-esd-list,
    .fb-esd-list-alt {
        list-style: none;
        padding: 0;
    }

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

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

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

    .fb-esd-list-alt li::before {
        content: '■';
        position: absolute;
        left: 0;
        color: #000;
    }

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

        .fb-esd-btn-group {
            flex-direction: column;
        }

        .fb-esd-btn-y,
        .fb-esd-btn-w {
            width: 100%;
        }

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

        .fb-esd-img-box {
            order: -1;
        }
    }