.main-content {
        padding: 14px 16px;
        background: #f7f8fa;
        min-height: 100vh;
    }

    /* ─── Header ─────────────────────────────────────────────── */
    .cu-header {
        background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
        border-radius: 10px;
        padding: 28px 32px;
        color: white;
        margin-bottom: 20px;
        position: relative;
        overflow: hidden;
        border: 1px solid #475569;
        box-shadow: 0 2px 10px rgba(0,0,0,.2);
    }

    .cu-header::before {
        content: '';
        position: absolute;
        top: 0; right: 0;
        width: 120px; height: 120px;
        background: rgba(255,255,255,.04);
        border-radius: 50%;
        transform: translate(30px, -30px);
    }

    .cu-header-inner {
        position: relative;
        z-index: 1;
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
        gap: 20px;
    }

    .cu-header-app {
        font-size: 11px;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 2px;
        color: #94a3b8;
        margin-bottom: 8px;
    }

    .cu-header-title {
        font-size: 26px;
        font-weight: 800;
        color: white;
        margin: 0 0 6px;
        letter-spacing: -.3px;
        line-height: 1.1;
    }

    .cu-header-sub {
        font-size: 13px;
        color: #94a3b8;
        margin: 0;
        font-weight: 400;
        line-height: 1.5;
        max-width: 500px;
    }

    .cu-header-meta {
        font-size: 11px;
        color: #64748b;
        text-align: right;
        flex-shrink: 0;
        line-height: 1.8;
    }

    .cu-header-meta span {
        display: block;
        color: #94a3b8;
    }

    /* ─── Layout ─────────────────────────────────────────────── */
    .cu-layout {
        display: grid;
        grid-template-columns: 1fr 280px;
        gap: 16px;
        align-items: start;
    }

    /* ─── Sections ───────────────────────────────────────────── */
    .cu-section {
        background: white;
        border: 1px solid #e3e4e8;
        border-radius: 8px;
        overflow: hidden;
        margin-bottom: 12px;
    }

    .cu-section:last-child { margin-bottom: 0; }

    .cu-section-header {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 11px 18px;
        border-bottom: 1px solid #e3e4e8;
        background: #fafbfc;
    }

    .cu-section-header-line {
        width: 3px;
        height: 16px;
        background: #334155;
        border-radius: 2px;
        flex-shrink: 0;
    }

    .cu-section-title {
        font-size: 12px;
        font-weight: 800;
        color: #1a1d23;
        text-transform: uppercase;
        letter-spacing: .8px;
        margin: 0;
    }

    .cu-section-body { padding: 20px 22px; }

    /* ─── Prose ──────────────────────────────────────────────── */
    .cu-prose {
        font-size: 13.5px;
        color: #374151;
        line-height: 1.85;
    }

    .cu-prose p { margin: 0 0 14px; }
    .cu-prose p:last-child { margin-bottom: 0; }
    .cu-prose strong { color: #111827; font-weight: 700; }

    .cu-lead {
        font-size: 15px;
        color: #1a1d23;
        font-weight: 600;
        line-height: 1.6;
        border-left: 3px solid #334155;
        padding-left: 14px;
        margin-bottom: 18px;
    }

    /* ─── Divider ────────────────────────────────────────────── */
    .cu-divider {
        height: 1px;
        background: #f0f1f3;
        margin: 18px 0;
    }

    /* ─── Feature List ───────────────────────────────────────── */
    .cu-feature-list { display: flex; flex-direction: column; }

    .cu-feature-row {
        display: flex;
        align-items: flex-start;
        gap: 14px;
        padding: 13px 0;
        border-bottom: 1px solid #f0f1f3;
    }

    .cu-feature-row:first-child { padding-top: 0; }
    .cu-feature-row:last-child  { border-bottom: none; padding-bottom: 0; }

    .cu-feature-num {
        font-size: 11px;
        font-weight: 800;
        color: #cbd5e1;
        min-width: 20px;
        padding-top: 2px;
        font-family: monospace;
        letter-spacing: .5px;
    }

    .cu-feature-name {
        font-size: 13px;
        font-weight: 700;
        color: #1a1d23;
        margin-bottom: 3px;
    }

    .cu-feature-desc {
        font-size: 12px;
        color: #6b7385;
        line-height: 1.55;
    }

    /* ─── Stack List ─────────────────────────────────────────── */
    .cu-stack-list { display: flex; flex-direction: column; }

    .cu-stack-row {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 0;
        border-bottom: 1px solid #f0f1f3;
        font-size: 13px;
    }

    .cu-stack-row:first-child { padding-top: 0; }
    .cu-stack-row:last-child  { border-bottom: none; padding-bottom: 0; }

    .cu-stack-dot {
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: #334155;
        flex-shrink: 0;
    }

    .cu-stack-name {
        font-weight: 700;
        color: #1a1d23;
        min-width: 130px;
    }

    .cu-stack-desc {
        color: #8a8f98;
        font-size: 12px;
    }

    /* ─── Sidebar ────────────────────────────────────────────── */
    .cu-sidebar-section {
        background: white;
        border: 1px solid #e3e4e8;
        border-radius: 8px;
        overflow: hidden;
        margin-bottom: 12px;
    }

    .cu-sidebar-section:last-child { margin-bottom: 0; }

    .cu-sidebar-header {
        padding: 10px 16px;
        background: #fafbfc;
        border-bottom: 1px solid #e3e4e8;
        font-size: 10px;
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: .9px;
        color: #8a8f98;
    }

    .cu-sidebar-body { padding: 14px 16px; }

    /* ─── People ─────────────────────────────────────────────── */
    .cu-person {
        padding: 10px 0;
        border-bottom: 1px solid #f0f1f3;
    }

    .cu-person:first-child { padding-top: 0; }
    .cu-person:last-child  { border-bottom: none; padding-bottom: 0; }

    .cu-person-name {
        font-size: 13px;
        font-weight: 700;
        color: #1a1d23;
        margin-bottom: 2px;
    }

    .cu-person-role {
        font-size: 11px;
        color: #8a8f98;
        line-height: 1.4;
    }

    /* ─── Detail Rows ────────────────────────────────────────── */
    .cu-detail-row {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 8px 0;
        border-bottom: 1px solid #f0f1f3;
        font-size: 12px;
    }

    .cu-detail-row:first-child { padding-top: 0; }
    .cu-detail-row:last-child  { border-bottom: none; padding-bottom: 0; }

    .cu-detail-key { color: #8a8f98; font-weight: 600; }
    .cu-detail-val { color: #1a1d23; font-weight: 700; text-align: right; }

    /* ─── Module Pills ───────────────────────────────────────── */
    .cu-module-list { display: flex; flex-wrap: wrap; gap: 6px; }

    .cu-module-pill {
        font-size: 11px;
        font-weight: 600;
        color: #374151;
        background: #f1f5f9;
        border: 1px solid #e2e8f0;
        border-radius: 4px;
        padding: 3px 9px;
    }

    /* ─── Callout ────────────────────────────────────────────── */
    .cu-callout {
        background: #f8fafc;
        border: 1px solid #e2e8f0;
        border-left: 3px solid #475569;
        border-radius: 0 6px 6px 0;
        padding: 14px 16px;
        font-size: 12.5px;
        color: #475569;
        line-height: 1.7;
        margin: 0;
    }

    /* ─── Responsive ─────────────────────────────────────────── */
    @media (max-width: 860px) {
        .cu-layout       { grid-template-columns: 1fr; }
        .cu-header-inner { flex-direction: column; align-items: flex-start; }
        .cu-header-meta  { text-align: left; }
    }