.detail-wrap {
        max-width: 1280px;
        margin: 0 auto;
        padding: 1rem 1.1rem 2rem;
    }

    .detail-grid {
        display: grid;
        grid-template-columns: minmax(0, 1fr) 400px;
        gap: 1rem;
        align-items: start;
    }

    .detail-main,
    .detail-side {
        min-width: 0;
    }

    .detail-hero,
    .rate-card,
    .formula-card,
    .related-card,
    .info-card,
    #detailCalcCard {
        background: var(--bd-surface);
        border: 1px solid var(--bd-border);
        border-radius: var(--r-2xl);
        box-shadow: var(--shadow-sm);
    }

    .detail-hero {
        padding: 1rem 1.15rem;
        margin-bottom: 1rem;
    }

    .detail-h1 {
        font-size: var(--fs-h1, clamp(1.5rem, 2.6vw, 2.1rem));
        font-weight: 800;
        line-height: var(--lh-tight, 1.2);
        letter-spacing: -.025em;
        margin: .25rem 0 .65rem;
        max-width: 22ch;
    }

    .detail-lead {
        font-size: .98rem;
        color: var(--bd-text-muted);
        line-height: 1.7;
        max-width: 74ch;
        margin-bottom: .95rem;
    }

    .detail-meta {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: .5rem;
    }

    .meta-pill {
        display: inline-flex;
        align-items: center;
        gap: .35rem;
        padding: .34rem .68rem;
        border-radius: 999px;
        background: var(--bd-surface-2);
        border: 1px solid var(--bd-border);
        color: var(--bd-text-muted);
        font-size: .8rem;
        font-weight: 600;
    }

    .meta-pill.hs {
        background: var(--bd-primary-light);
        border-color: var(--bd-primary-mid);
        color: var(--bd-primary);
        font-family: "Courier New", monospace;
        font-weight: 700;
    }

    .hero-actions {
        display: flex;
        align-items: center;
        gap: .65rem;
        flex-wrap: wrap;
        margin-top: 1rem;
    }

    .rate-card,
    .formula-card,
    .related-card,
    .info-card {
        padding: 1.1rem 1.15rem;
        margin-bottom: 1rem;
    }

    .card-title {
        font-size: 1.08rem;
        font-weight: 800;
        margin: 0 0 .35rem;
    }

    .card-sub {
        font-size: .9rem;
        color: var(--bd-text-muted);
        margin: 0 0 .9rem;
        line-height: 1.6;
    }

    .rate-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
        gap: .75rem;
    }

    .rate-box {
        border: 1px solid var(--bd-border);
        border-radius: var(--r-xl);
        background: var(--bd-surface-2);
        padding: .95rem;
        display: flex;
        flex-direction: column;
        gap: .18rem;
    }

    .rate-top {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: .5rem;
    }

    .rate-abbr {
        font-size: .78rem;
        font-weight: 800;
        letter-spacing: .05em;
        text-transform: uppercase;
        color: var(--bd-text-muted);
    }

    .rate-name {
        font-size: .84rem;
        color: var(--bd-text-muted);
        line-height: 1.35;
    }

    .rate-val {
        font-size: 1.2rem;
        font-weight: 800;
        font-variant-numeric: tabular-nums;
        color: var(--bd-text);
    }

    .rate-box.cd .rate-val { color: var(--c-cd); }
    .rate-box.rd .rate-val { color: var(--c-rd); }
    .rate-box.sd .rate-val { color: var(--c-sd); }
    .rate-box.vat .rate-val { color: var(--c-vat); }
    .rate-box.ait .rate-val { color: var(--c-ait); }
    .rate-box.at .rate-val { color: var(--c-at); }

    .formula-list {
        display: grid;
        grid-template-columns: 1fr;
        gap: .65rem;
    }

    .formula-item {
        display: flex;
        align-items: flex-start;
        gap: .75rem;
        border: 1px solid var(--bd-border);
        border-radius: var(--r-xl);
        padding: .85rem .9rem;
        background: var(--bd-surface-2);
    }

    .formula-step {
        width: 28px;
        height: 28px;
        border-radius: var(--r-sm);
        background: var(--bd-primary);
        color: #fff;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: .77rem;
        font-weight: 800;
        flex-shrink: 0;
    }

    .formula-copy strong {
        display: block;
        font-size: .9rem;
        color: var(--bd-text);
        margin-bottom: .12rem;
    }

    .formula-copy span {
        display: block;
        font-size: .84rem;
        color: var(--bd-text-muted);
        line-height: 1.5;
    }

    .info-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: .75rem;
    }

    .info-item {
        border: 1px solid var(--bd-border);
        border-radius: var(--r-xl);
        padding: .95rem;
        background: var(--bd-surface-2);
    }

    .info-item h3 {
        font-size: .94rem;
        font-weight: 700;
        margin: 0 0 .22rem;
    }

    .info-item p {
        margin: 0;
        font-size: .84rem;
        color: var(--bd-text-muted);
        line-height: 1.55;
    }

    .calc-sticky {
        position: sticky;
        top: calc(var(--nav-h) + 1rem);
    }

    #detailCalcCard {
        overflow: hidden;
    }

    .calc-head {
        padding: .9rem 1.1rem .85rem;
        border-bottom: 1px solid var(--bd-divider);
    }

    .calc-head h2 {
        font-size: 1.18rem;
        font-weight: 800;
        display: flex;
        align-items: center;
        gap: .5rem;
        margin: 0 0 .35rem;
    }

    .calc-head h2 i { color: var(--bd-primary); }

    .calc-head p {
        margin: 0;
        font-size: .88rem;
        color: var(--bd-text-muted);
        line-height: 1.6;
    }

    .calc-body {
        padding: 1rem 1.15rem;
    }

    .selected-box {
        display: flex;
        align-items: flex-start;
        gap: .7rem;
        padding: .8rem .85rem;
        border-radius: var(--r-lg);
        background: var(--bd-accent-light);
        border: 1px solid rgba(45,122,58,.18);
        margin-bottom: 1rem;
    }

    .selected-box i {
        color: var(--bd-accent);
        margin-top: .08rem;
    }

    .selected-box-code {
        font-family: "Courier New", monospace;
        font-size: .9rem;
        font-weight: 700;
        color: var(--bd-text);
        margin-bottom: .15rem;
    }

    .selected-box-desc {
        font-size: .84rem;
        color: var(--bd-text-muted);
        line-height: 1.5;
    }

    .field-block {
        margin-bottom: .9rem;
    }

    .field-label {
        display: flex;
        align-items: center;
        gap: .4rem;
        font-size: .82rem;
        font-weight: 700;
        color: var(--bd-text-muted);
        margin-bottom: .42rem;
    }

    #detailHsInput,
    #detailCifValue {
        width: 100%;
        outline: none;
        transition: border-color var(--t-fast), box-shadow var(--t-fast);
    }

    #detailHsInput {
        height: 44px;
        border: 1.5px solid var(--bd-border);
        border-radius: var(--r-lg);
        background: var(--bd-bg);
        color: var(--bd-text);
        padding: 0 .85rem;
        font-family: "Courier New", monospace;
        font-size: .95rem;
        font-weight: 700;
    }

    #detailHsInput:focus,
    .detail-cif-wrap:focus-within {
        border-color: var(--bd-primary);
        box-shadow: 0 0 0 3px rgba(1,105,111,.10);
    }

    .detail-cif-wrap {
        display: flex;
        align-items: center;
        border: 1.5px solid var(--bd-border);
        border-radius: var(--r-lg);
        background: var(--bd-bg);
        overflow: hidden;
        transition: border-color var(--t-fast), box-shadow var(--t-fast);
    }

    .detail-cif-prefix,
    .detail-cif-unit {
        color: var(--bd-text-muted);
        font-size: .82rem;
        font-weight: 700;
        flex-shrink: 0;
    }

    .detail-cif-prefix {
        padding: 0 .78rem;
        border-right: 1px solid var(--bd-border);
    }

    .detail-cif-unit {
        padding: 0 .75rem 0 .42rem;
    }

    #detailCifValue {
        height: 44px;
        border: 0;
        background: transparent;
        color: var(--bd-text);
        padding: 0 .75rem;
        font-size: .98rem;
        font-weight: 700;
    }

    .calc-results-wrap {
        margin-top: 1rem;
        border: 1px solid var(--bd-border);
        border-radius: var(--r-xl);
        overflow: hidden;
    }

    .calc-table {
        width: 100%;
        border-collapse: collapse;
        font-size: .83rem;
    }

    .calc-table thead th {
        background: var(--bd-surface-offset);
        padding: .65rem .75rem;
        border-bottom: 1px solid var(--bd-border);
        color: var(--bd-text-muted);
        font-size: .71rem;
        font-weight: 800;
        letter-spacing: .05em;
        text-transform: uppercase;
        white-space: nowrap;
    }

    .calc-table td {
        padding: .65rem .75rem;
        border-bottom: 1px solid var(--bd-divider);
        vertical-align: middle;
    }

    .calc-table th:not(:first-child),
    .calc-table td:not(:first-child) {
        text-align: right;
    }

    .calc-table tbody tr:hover td {
        background: var(--bd-surface-2);
    }

    .detail-total-row td {
        background: var(--bd-primary-light);
        border-top: 1px solid var(--bd-primary-mid);
        font-weight: 800;
    }

    #detailEmptyState {
        padding: 1.8rem 1rem;
        text-align: center;
        color: var(--bd-text-muted);
    }

    #detailEmptyState i {
        display: inline-flex;
        width: 52px;
        height: 52px;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background: var(--bd-surface-offset);
        color: var(--bd-text-faint);
        font-size: 1.2rem;
        margin-bottom: .8rem;
    }

    #detailEmptyState h3 {
        font-size: .98rem;
        font-weight: 700;
        color: var(--bd-text);
        margin-bottom: .25rem;
    }

    #detailEmptyState p {
        margin: 0 auto;
        max-width: 28ch;
        font-size: .86rem;
    }

    #detailSummary {
        display: flex;
        flex-wrap: wrap;
        gap: .55rem;
        padding: .95rem 1.15rem;
        background: var(--bd-surface-offset);
        border-top: 1px solid var(--bd-border);
    }

    .summary-item {
        flex: 1;
        min-width: 100px;
        display: flex;
        flex-direction: column;
        gap: .12rem;
    }

    .summary-label {
        font-size: .68rem;
        font-weight: 800;
        letter-spacing: .06em;
        text-transform: uppercase;
        color: var(--bd-text-muted);
    }

    .summary-value {
        font-size: 1rem;
        font-weight: 800;
        font-variant-numeric: tabular-nums;
        color: var(--bd-text);
    }

    .summary-item.duty .summary-value { color: var(--bd-warning); }
    .summary-item.landed .summary-value { color: var(--bd-primary); }
    .summary-item.tti .summary-value { color: var(--bd-accent); }

    .calc-actions {
        display: flex;
        gap: .65rem;
        flex-wrap: wrap;
        padding: 1rem 1.15rem 1.15rem;
        border-top: 1px solid var(--bd-divider);
    }

    .related-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
        gap: .75rem;
    }

    .related-item {
        display: flex;
        flex-direction: column;
        gap: .45rem;
        padding: 1rem;
        border: 1px solid var(--bd-border);
        border-radius: var(--r-xl);
        background: var(--bd-surface-2);
        transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
    }

    .related-item:hover {
        background: var(--bd-primary-light);
        border-color: var(--bd-primary-mid);
        box-shadow: var(--shadow-sm);
    }

    .related-code {
        display: inline-flex;
        width: fit-content;
        font-family: "Courier New", monospace;
        font-size: .82rem;
        font-weight: 700;
        color: var(--bd-primary);
        background: var(--bd-surface);
        border-radius: var(--r-sm);
        padding: .18rem .48rem;
    }

    .related-desc {
        font-size: .86rem;
        color: var(--bd-text);
        line-height: 1.5;
        min-height: 3.1em;
    }

    .related-actions {
        display: flex;
        align-items: center;
        gap: .5rem;
        flex-wrap: wrap;
        margin-top: auto;
    }

    .related-actions a {
        display: inline-flex;
        align-items: center;
        gap: .35rem;
    }

    @media (max-width: 1080px) {
        .detail-grid {
            grid-template-columns: 1fr;
        }

        .calc-sticky {
            position: static;
        }
    }

    @media (max-width: 640px) {
        .detail-wrap {
            padding: 1rem .85rem 2rem;
        }

        .detail-hero,
        .rate-card,
        .formula-card,
        .related-card,
        .info-card,
        #detailCalcCard {
            border-radius: var(--r-xl);
        }

        .detail-hero,
        .rate-card,
        .formula-card,
        .related-card,
        .info-card,
        .calc-head,
        .calc-body,
        #detailSummary,
        .calc-actions {
            padding-left: 1rem;
            padding-right: 1rem;
        }

        #detailSummary {
            flex-direction: column;
        }

        .summary-item {
            flex-direction: row;
            justify-content: space-between;
            align-items: center;
        }

        .calc-actions {
            flex-direction: column;
        }

        .calc-actions > * {
            width: 100%;
            justify-content: center;
        }

        .calc-table {
            font-size: .8rem;
        }

        .calc-table thead th,
        .calc-table td {
            padding-left: .58rem;
            padding-right: .58rem;
        }
    }

    /* ────────────────────────────────────────────────────────────
       PR 5: detail polish
       Slim chip rate strip · auto-generated SEO paragraph · mobile CTA
       ──────────────────────────────────────────────────────────── */
    .rate-strip {
        display: flex;
        flex-wrap: wrap;
        gap: .4rem .45rem;
        align-items: center;
        margin: .25rem 0 1rem;
        padding: .65rem .85rem;
        background: var(--bd-surface);
        border: 1px solid var(--bd-border);
        border-radius: var(--r-xl, .875rem);
    }
    .rate-strip .rs-chip {
        display: inline-flex;
        align-items: center;
        gap: .35rem;
        height: 26px;
        padding: 0 .55rem;
        border: 1px solid var(--bd-border);
        border-radius: 999px;
        font-size: var(--fs-small, .85rem);
        font-weight: 600;
        background: var(--bd-surface-2);
        color: var(--bd-text);
        font-variant-numeric: tabular-nums;
    }
    .rate-strip .rs-chip .rs-abbr {
        font-size: var(--fs-label, .72rem);
        letter-spacing: .04em;
        text-transform: uppercase;
        color: var(--bd-text-muted);
        font-weight: 700;
    }
    .rate-strip .rs-chip[data-kind="cd"]  { background: rgba(220, 38, 38, .10);  border-color: rgba(220, 38, 38, .25); }
    .rate-strip .rs-chip[data-kind="rd"]  { background: rgba(234, 88, 12, .10);  border-color: rgba(234, 88, 12, .25); }
    .rate-strip .rs-chip[data-kind="sd"]  { background: rgba(217, 119, 6, .10);  border-color: rgba(217, 119, 6, .25); }
    .rate-strip .rs-chip[data-kind="vat"] { background: rgba(8, 145, 178, .10);  border-color: rgba(8, 145, 178, .25); }
    .rate-strip .rs-chip[data-kind="ait"] { background: rgba(124, 58, 237, .10); border-color: rgba(124, 58, 237, .25); }
    .rate-strip .rs-chip[data-kind="at"]  { background: rgba(45, 122, 58, .10);  border-color: rgba(45, 122, 58, .25); }
    .rate-strip .rs-chip[data-kind="cd"]  .rs-abbr { color: var(--c-cd); }
    .rate-strip .rs-chip[data-kind="rd"]  .rs-abbr { color: var(--c-rd); }
    .rate-strip .rs-chip[data-kind="sd"]  .rs-abbr { color: var(--c-sd); }
    .rate-strip .rs-chip[data-kind="vat"] .rs-abbr { color: var(--c-vat); }
    .rate-strip .rs-chip[data-kind="ait"] .rs-abbr { color: var(--c-ait); }
    .rate-strip .rs-chip[data-kind="at"]  .rs-abbr { color: var(--c-at); }

    .rate-strip .rs-arrow {
        margin-left: auto;
        margin-right: .15rem;
        color: var(--bd-text-faint);
        font-weight: 700;
        font-size: 1rem;
    }
    .rate-strip .rs-tti {
        display: inline-flex;
        align-items: center;
        gap: .4rem;
        height: 30px;
        padding: 0 .85rem;
        border-radius: 999px;
        font-weight: 700;
        font-size: var(--fs-body, .92rem);
        background: var(--bd-primary);
        color: #fff;
        border: 1px solid var(--bd-primary);
        font-variant-numeric: tabular-nums;
    }
    .rate-strip .rs-tti span:first-child {
        font-size: var(--fs-label, .72rem);
        letter-spacing: .06em;
        text-transform: uppercase;
        opacity: .85;
        font-weight: 600;
    }

    @media (max-width: 600px) {
        .rate-strip { padding: .55rem .65rem; }
        .rate-strip .rs-chip { height: 24px; font-size: .8rem; padding: 0 .5rem; }
        .rate-strip .rs-arrow { display: none; }
        .rate-strip .rs-tti { width: 100%; justify-content: center; margin-top: .35rem; }
    }

    /* SEO descriptive paragraph */
    .detail-summary-p {
        margin: 0 0 1.1rem;
        padding: .9rem 1rem;
        font-size: var(--fs-body, .92rem);
        line-height: var(--lh-base, 1.55);
        color: var(--bd-text-muted);
        background: var(--bd-surface);
        border: 1px solid var(--bd-divider, var(--bd-border));
        border-radius: var(--r-lg, .75rem);
    }
    .detail-summary-p strong { color: var(--bd-text); font-weight: 600; }

    /* Mobile sticky "Calculate now" CTA — visible only on small screens */
    .mobile-calc-cta {
        display: none;
    }
    @media (max-width: 768px) {
        .mobile-calc-cta {
            display: flex;
            position: fixed;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 60;
            padding: .55rem .85rem calc(.55rem + env(safe-area-inset-bottom, 0));
            background: var(--bd-surface);
            border-top: 1px solid var(--bd-border);
            box-shadow: 0 -2px 12px rgba(0, 0, 0, .06);
            justify-content: center;
            gap: .5rem;
        }
        .mobile-calc-cta a {
            flex: 1 1 auto;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .4rem;
            height: var(--btn-h, 36px);
            border-radius: var(--r-md, .5rem);
            font-size: var(--fs-body, .92rem);
            font-weight: 600;
            text-decoration: none;
            background: var(--bd-primary);
            color: #fff;
            border: 1px solid var(--bd-primary);
        }
        .mobile-calc-cta a.alt {
            background: transparent;
            color: var(--bd-text);
            border-color: var(--bd-border);
        }
        body.has-mobile-calc-cta { padding-bottom: 64px; }
    }
    @media print {
        .mobile-calc-cta { display: none !important; }
    }

    /* Premium glassmorphism — detail surfaces (palette unchanged). */
    @supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
        .detail-hero,
        .rate-card,
        .formula-card,
        .related-card,
        .info-card,
        #detailCalcCard,
        .rate-strip,
        .detail-summary-p {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            box-shadow: var(--glass-shadow);
        }
        .mobile-calc-cta {
            background: var(--glass-bg-strong);
            -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
        }
    }

    /* Sit the sticky mobile CTA above the bottom tab bar (not behind it). */
    @media (max-width: 768px) {
        .mobile-calc-cta {
            bottom: calc(var(--mbn-h, 62px) + env(safe-area-inset-bottom, 0px));
            padding-bottom: .55rem;
        }
        body.has-mobile-calc-cta {
            padding-bottom: calc(var(--mbn-h, 62px) + 60px + env(safe-area-inset-bottom, 0px));
        }
    }