/* ══════════════════════════════════════════
   ANIMATIONS
══════════════════════════════════════════ */
    @keyframes fadeUp {
        from {
            opacity: 0;
            transform: translateY(24px);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
        }

        to {
            opacity: 1;
        }
    }

    [data-anim] {
        opacity: 0;
        animation: fadeUp 0.65s var(--ease-out) both;
    }

    [data-anim="fade"] {
        animation-name: fadeIn;
    }

    @media (prefers-reduced-motion: reduce) {
        [data-anim] {
            animation: none;
            opacity: 1;
        }
    }

    /* ── Header ── */
    .qt-header {
        text-align: center;
        margin-bottom: var(--space-8);
    }

    .qt-eyebrow {
        display: inline-flex;
        align-items: center;
        gap: var(--space-2);
        font-size: var(--text-sm);
        font-weight: 700;
        letter-spacing: 0.13em;
        text-transform: uppercase;
        color: var(--coral);
        margin-bottom: var(--space-4);
    }

    .qt-eyebrow::before {
        content: '';
        width: 18px;
        height: 2px;
        background: var(--coral);
        border-radius: var(--radius-full);
        flex-shrink: 0;
    }

    .hpa-headline {
        font-size: var(--text-xl);
        font-weight: 800;
        line-height: 1.2;
        color: var(--navy-900);
        margin-bottom: var(--space-5);
    }

    /* coral gradient on the percentage */
    .hpa-highlight {
        background: linear-gradient(90deg, var(--coral) 0%, var(--coral-soft) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    /* ══════════════════════════════════════════
   HERO
══════════════════════════════════════════ */
    .dn-hero {
        background: linear-gradient(135deg, #091830 0%, #0d2d5e 55%, #1a4a7a 100%);
        padding: var(--space-9) 0 var(--space-8);
        position: relative;
        overflow: hidden;
    }

    .dn-hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background-image:
            linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
            linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
        background-size: 64px 64px;
        pointer-events: none;
    }

    /* teal glow top-right */
    .dn-hero::after {
        content: '';
        position: absolute;
        top: -100px;
        right: -60px;
        width: 480px;
        height: 480px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(56, 217, 192, 0.12) 0%, transparent 65%);
        pointer-events: none;
    }

    .dn-hero-sep {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 1px;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.10), transparent);
    }

    .dn-hero-inner {
        position: relative;
        z-index: 1;
        max-width: 740px;
    }

    .dn-eyebrow {
        display: inline-flex;
        align-items: center;
        gap: var(--space-2);
        padding: 6px 14px;
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: var(--radius-full);
        background: rgba(255, 255, 255, 0.07);
        font-size: var(--text-sm);
        font-weight: 500;
        color: rgba(255, 255, 255, 0.75);
        margin-bottom: var(--space-5);
    }

    .dn-eyebrow::before {
        content: '';
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: var(--coral);
        flex-shrink: 0;
    }

    .dn-hero h1 {
        font-size: clamp(36px, 5vw, 72px);
        font-weight: 800;
        line-height: 1.05;
        letter-spacing: -0.035em;
        color: #fff;
        margin-bottom: var(--space-4);
    }

    .dn-hero h1 .accent {
        color: var(--teal);
    }

    .dn-hero-sub {
        font-size: var(--text-md);
        color: rgba(255, 255, 255, 0.6);
        line-height: 1.7;
        max-width: 560px;
        margin-bottom: var(--space-6);
    }

    .dn-hero-actions {
        display: flex;
        align-items: center;
        gap: var(--space-3);
        flex-wrap: wrap;
    }

    .dn-btn {
        display: inline-flex;
        align-items: center;
        gap: var(--space-2);
        height: 48px;
        padding: 0 var(--space-6);
        border-radius: var(--radius-full);
        font-size: var(--text-base);
        font-weight: 700;
        cursor: pointer;
        border: none;
        text-decoration: none;
        white-space: nowrap;
        transition: transform var(--duration) var(--ease-out), box-shadow var(--duration), background var(--duration);
    }

    .dn-btn:hover {
        transform: translateY(-2px);
    }

    .dn-btn:active {
        transform: translateY(0);
    }

    .dn-btn-primary {
        background: var(--coral);
        color: white;
        box-shadow: 0 4px 20px rgba(56, 217, 192, 0.3);
    }

    .dn-btn-ghost {
        background: rgba(255, 255, 255, 0.08);
        color: rgba(255, 255, 255, 0.85);
        border: 1.5px solid rgba(255, 255, 255, 0.16);
    }

    .dn-btn-ghost:hover {
        background: rgba(255, 255, 255, 0.14);
    }



    .hpa-highlight {
        background: linear-gradient(90deg, var(--coral) 0%, var(--coral-soft) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    /* ===================== SECTION HEADER ===================== */

    .section-5chi-so {
        padding: var(--space-9) 0;
    }

    .section-5chi-so .eyebrow {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: var(--space-2);
        font-size: var(--text-sm);
        font-weight: 700;
        letter-spacing: .12em;
        text-transform: uppercase;
        color: var(--coral-hex);
        margin-bottom: var(--space-4);
    }

    .section-5chi-so .eyebrow::before {
        content: "";
        width: 22px;
        height: 2px;
        background: var(--coral-hex);
        border-radius: var(--radius-full);
    }

    .section-5chi-so .section-heading {
        text-align: center;
        font-size: clamp(28px, 4vw, 44px);
        font-weight: 800;
        line-height: 1.25;
        color: var(--navy-900);
        max-width: 760px;
        margin: 0 auto var(--space-8);
    }

    .section-5chi-so .section-heading em {
        font-style: normal;
        color: var(--coral-hex);
    }

    /* ===================== GRID ROWS ===================== */

    .chi-so-row1 {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-5);
    }

    .chi-so-row2 {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-5);
        max-width: 66.6%;
        margin: var(--space-5) auto 0;
    }

    /* ===================== CARD BASE ===================== */

    .chi-so-card {
        position: relative;
        display: flex;
        flex-direction: column;
        height: 100%;
        background: var(--surface-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-xl);
        padding: var(--space-6);
        box-shadow: var(--shadow-sm);
        overflow: hidden;
        transition: transform var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out);
    }

    .chi-so-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-md);
        border-color: var(--border-hover);
    }

    .card-top {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: var(--space-5);
    }

    .card-icon-wrap {
        width: 52px;
        height: 52px;
        flex-shrink: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-md);
        font-size: 19px;
    }

    .card-num {
        font-size: 56px;
        font-weight: 800;
        line-height: 1;
        letter-spacing: -.02em;
    }

    .card-title {
        font-size: var(--text-md);
        font-weight: 700;
        color: var(--navy-900);
        line-height: 1.4;
        margin-bottom: var(--space-3);
    }

    .card-desc {
        font-size: var(--text-base);
        color: var(--navy-300);
        line-height: 1.65;
    }

    .card-ci-note {
        display: inline-flex;
        align-items: center;
        gap: var(--space-1);
        margin-top: var(--space-3);
        font-size: var(--text-sm);
        font-weight: 700;
        color: var(--teal-dark);
        background: rgba(34, 184, 160, .12);
        padding: var(--space-1) var(--space-3);
        border-left: 4px solid var(--teal-dark);
    }

    /* ===================== SCORE BAR ===================== */

    .card-score {
        margin-top: auto;
        padding-top: var(--space-5);
    }

    .score-label {
        font-size: var(--text-xs);
        font-weight: 700;
        letter-spacing: .06em;
        text-transform: uppercase;
        color: var(--navy-500);
        margin-bottom: var(--space-2);
    }

    .score-track {
        position: relative;
        width: 100%;
        height: 8px;
        background: var(--navy-100);
        border-radius: var(--radius-full);
        overflow: hidden;
    }

    .score-fill {
        position: absolute;
        inset: 0;
        width: 0%;
        border-radius: var(--radius-full);
        transition: width 1s var(--ease-out);
    }

    .section-5chi-so.in-view .score-fill {
        width: var(--fill, 60%);
    }

    .score-range {
        display: flex;
        justify-content: space-between;
        margin-top: var(--space-2);
        font-size: var(--text-xs);
        color: var(--navy-500);
        opacity: .7;
    }

    @media (prefers-reduced-motion: reduce) {
        .chi-so-card {
            opacity: 1 !important;
            transform: none !important;
            transition: none !important;
        }

        .score-fill {
            width: var(--fill, 60%) !important;
            transition: none !important;
        }
    }

    /* ===================== SCROLL-IN REVEAL ===================== */

    .chi-so-card {
        opacity: 0;
        transform: translateY(28px);
        transition: opacity .7s var(--ease-out), transform .7s var(--ease-out), box-shadow var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out);
    }

    .section-5chi-so.in-view .chi-so-card {
        opacity: 1;
        transform: translateY(0);
    }

    .chi-so-row1 .chi-so-card:nth-child(1) {
        transition-delay: .15s;
    }

    .chi-so-row1 .chi-so-card:nth-child(2) {
        transition-delay: .2s;
    }

    .chi-so-row1 .chi-so-card:nth-child(3) {
        transition-delay: .3s;
    }

    .chi-so-row2 .chi-so-card:nth-child(1) {
        transition-delay: .12s;
    }

    .chi-so-row2 .chi-so-card:nth-child(2) {
        transition-delay: .24s;
    }

    .chi-so-row1 .chi-so-card:nth-child(1) .score-fill {
        transition-delay: .35s;
    }

    .chi-so-row1 .chi-so-card:nth-child(2) .score-fill {
        transition-delay: .47s;
    }

    .chi-so-row1 .chi-so-card:nth-child(3) .score-fill {
        transition-delay: .59s;
    }

    .chi-so-row2 .chi-so-card:nth-child(1) .score-fill {
        transition-delay: .47s;
    }

    .chi-so-row2 .chi-so-card:nth-child(2) .score-fill {
        transition-delay: .59s;
    }

    /* ===================== COLOR VARIANTS ===================== */

    .chi-so-card--coral .card-icon-wrap {
        background: rgba(232, 112, 95, .12);
        color: var(--coral-hex);
    }

    .chi-so-card--coral .card-num {
        color: rgba(232, 112, 95, .18);
    }

    .chi-so-card--coral .score-fill {
        background: var(--coral-hex);
    }

    .chi-so-card--teal .card-icon-wrap {
        background: rgba(56, 217, 192, .14);
        color: var(--teal-dark);
    }

    .chi-so-card--teal .card-num {
        color: rgba(34, 184, 160, .18);
    }

    .chi-so-card--teal .score-fill {
        background: var(--teal-dark);
    }

    .chi-so-card--synth {
        border-color: var(--border-hover);
    }

    .card-synth-badge {
        position: absolute;
        top: var(--space-5);
        right: var(--space-5);
        font-size: var(--text-xs);
        font-weight: 700;
        letter-spacing: .04em;
        color: #fff;
        padding: var(--space-1) var(--space-3);
        border-radius: var(--radius-full);
        background: var(--coral-hex);
    }

    /* ===================== RESPONSIVE ===================== */

    @media (max-width: 1024px) {
        .container {
            padding: 0 var(--space-5);
        }

        .chi-so-row1 {
            grid-template-columns: repeat(2, 1fr);
        }

        .chi-so-row1 .chi-so-card:nth-child(3) {
            grid-column: 1 / -1;
        }

        .chi-so-row2 {
            max-width: 100%;
        }
    }

    @media (max-width: 768px) {
        .section-5chi-so {
            padding: var(--space-7) 0;
        }

        .section-5chi-so .section-heading {
            margin-bottom: var(--space-6);
        }

        .chi-so-row1,
        .chi-so-row2 {
            grid-template-columns: 1fr;
        }

        .chi-so-row1 .chi-so-card:nth-child(3) {
            grid-column: auto;
        }

        .chi-so-row2 {
            margin-top: var(--space-4);
        }

        .card-num {
            font-size: 44px;
        }

        .chi-so-card {
            padding: var(--space-5);
        }
    }

    @media (max-width: 480px) {
        .container {
            padding: 0 var(--space-4);
        }

        .card-icon-wrap {
            width: 44px;
            height: 44px;
            font-size: 16px;
        }

        .card-num {
            font-size: 38px;
        }

        .card-title {
            font-size: var(--text-base);
        }

        .card-desc {
            font-size: var(--text-sm);
        }
    }


    /* ===================== FORMULAR CONTAINER & HEADING ===================== */

    .mamaliho-formula-container {
        max-width: 1280px;
        margin: 0 auto;
        padding: var(--space-9) var(--space-7);
    }

    /* ===================== GRID ===================== */

    .formula-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-6);
        position: relative;
    }

    /* ===================== CARD ===================== */

    .formula-column {
        position: relative;
        display: flex;
        flex-direction: column;
        height: 100%;
        background: var(--surface-card);
        border: 1px solid var(--border);
        border-top: 4px solid var(--border);
        border-radius: var(--radius-xl);
        padding: var(--space-6);
        /* box-shadow: var(--shadow-sm); */
        transition: transform var(--duration) var(--ease-out),
            box-shadow var(--duration) var(--ease-out),
            border-color var(--duration) var(--ease-out);
    }

    .formula-column:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-md);
        /* border-color: var(--border-hover); */
    }

    .formula-column h3 {
        font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
        font-size: clamp(19px, 2vw, 20px);
        font-weight: 700;
        letter-spacing: -.01em;
        text-align: center;
        line-height: 1.35;
        margin-bottom: var(--space-4);
    }

    .formula-description {
        font-size: var(--text-base);
        color: var(--navy-300);
        line-height: 1.65;
        margin-bottom: var(--space-5);
    }

    .formula-legend {
        list-style: none;
        margin-top: auto;
        padding-top: var(--space-4);
        border-top: 1px solid var(--border);
        display: flex;
        flex-direction: column;
        gap: var(--space-2);
    }

    .formula-legend li {
        position: relative;
        padding-left: var(--space-4);
        font-size: var(--text-sm);
        color: var(--navy-300);
        line-height: 1.5;
    }

    .formula-legend li::before {
        content: "";
        position: absolute;
        left: 0;
        top: 7px;
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: currentColor;
    }

    .formula-legend strong {
        color: var(--navy-900);
        font-weight: 700;
    }

    /* ===================== COLOR VARIANTS (1st/3rd = coral, 2nd = teal) ===================== */


    .formula-column:nth-child(1) h3,
    .formula-column:nth-child(3) h3 {
        color: var(--coral-hex);
    }

    .formula-column:nth-child(1) .formula-legend li,
    .formula-column:nth-child(3) .formula-legend li {
        color: var(--coral-hex);
    }

    .formula-column:nth-child(1) .formula-legend li::before,
    .formula-column:nth-child(3) .formula-legend li::before {
        color: var(--coral-hex);
    }


    .formula-column:nth-child(2) h3 {
        color: var(--teal-dark);
    }

    .formula-column:nth-child(2) .formula-legend li {
        color: var(--teal-dark);
    }

    .formula-column:nth-child(2) .formula-legend li::before {
        color: var(--teal-dark);
    }

    /* legend text itself stays neutral; only the bullet + strong term use color */
    .formula-legend li {
        color: var(--navy-300) !important;
    }

    .formula-legend li::before {
        background: currentColor;
    }

    .formula-column:nth-child(1) .formula-legend li::before,
    .formula-column:nth-child(3) .formula-legend li::before {
        background: var(--coral-hex);
    }

    .formula-column:nth-child(2) .formula-legend li::before {
        background: var(--teal-dark);
    }

    /* ===================== SEQUENCE CONNECTOR (this is a real build-up chain, not decoration) ===================== */

    .formula-column:not(:last-child)::after {
        content: "→";
        position: absolute;
        top: 50%;
        right: -29px;
        transform: translateY(-50%);
        font-size: 20px;
        font-weight: 700;
        color: var(--navy-500);
        opacity: .45;
        z-index: 1;
    }

    /* ===================== SCROLL-IN REVEAL ===================== */

    .mamaliho-formula-container h2,
    .formula-column {
        opacity: 0;
        transform: translateY(28px);
        transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
    }

    .mamaliho-formula-container.in-view h2,
    .mamaliho-formula-container.in-view .formula-column {
        opacity: 1;
        transform: translateY(0);
    }

    /* keep hover/border transitions independent of the reveal transition */
    .formula-column {
        transition: opacity .7s var(--ease-out),
            transform .7s var(--ease-out),
            box-shadow var(--duration) var(--ease-out),
            border-color var(--duration) var(--ease-out);
    }

    .mamaliho-formula-container h2 {
        transition-delay: 0s;
    }

    .formula-column:nth-child(1) {
        transition-delay: .15s;
    }

    .formula-column:nth-child(2) {
        transition-delay: .27s;
    }

    .formula-column:nth-child(3) {
        transition-delay: .39s;
    }

    @media (prefers-reduced-motion: reduce) {

        .mamaliho-formula-container h2,
        .formula-column {
            opacity: 1 !important;
            transform: none !important;
            transition: none !important;
        }
    }

    /* ===================== RESPONSIVE ===================== */

    @media (max-width: 1024px) {
        .mamaliho-formula-container {
            padding: var(--space-7) var(--space-5);
        }
    }

    @media (max-width: 768px) {
        .formula-grid {
            grid-template-columns: 1fr;
            gap: var(--space-7);
        }

        .formula-column:not(:last-child)::after {
            content: "↓";
            top: auto;
            right: 50%;
            bottom: calc(-1 * var(--space-7) / 2 - 10px);
            transform: translate(50%, 0);
        }

        .mamaliho-formula-container h2::after {
            margin-bottom: var(--space-5);
        }
    }

    @media (max-width: 480px) {
        .mamaliho-formula-container {
            padding: var(--space-6) var(--space-4);
        }

        .formula-column {
            padding: var(--space-5);
        }

        .formula-description {
            font-size: var(--text-sm);
        }
    }

    /* ===== Measure CTA section ===== */

    .measure-cta {
        padding: var(--space-9) 0;
        background: var(--surface-page);
    }

    .measure-cta__inner {
        display: grid;
        grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
        align-items: center;
        gap: var(--space-8);
        background-color: var(--surface-card);
        padding: 20px;
        border-radius: 16px;
    }

    .measure-cta__media {
        position: relative;
        isolation: isolate;
    }

    .measure-cta__media::before {
        content: "";
        position: absolute;
        inset: -10% -14% -14% -10%;
        background: radial-gradient(closest-side, var(--coral-soft-hex) 0%, rgba(240, 160, 144, 0) 72%);
        opacity: .35;
        z-index: -1;
        filter: blur(2px);
    }

    .measure-cta__media-frame {
        position: relative;
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-lg);
        aspect-ratio: 6 / 5;
        border: 1px solid var(--border);
    }

    .measure-cta__media-frame img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
    }

    .measure-cta__actions {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-3);
    }

    .m-btn {
        display: inline-flex;
        align-items: center;
        gap: var(--space-2);
        padding: var(--space-3) var(--space-5);
        border-radius: var(--radius-full);
        font-size: var(--text-base);
        font-weight: 600;
        text-decoration: none;
        line-height: 1;
        transition: transform var(--duration) var(--ease-out),
            box-shadow var(--duration) var(--ease-out),
            background var(--duration) var(--ease-out),
            border-color var(--duration) var(--ease-out);
    }

    .m-btn i:first-child {
        font-size: .85em;
        opacity: .9;
    }

    .m-btn i.fa-arrow-right {
        font-size: .8em;
        transition: transform var(--duration) var(--ease-out);
    }

    .m-btn:hover i.fa-arrow-right {
        transform: translateX(3px);
    }

    .m-btn--primary {
        background: var(--coral-hex);
        color: #fff;
        box-shadow: 0 8px 20px rgba(232, 112, 95, .28);
    }

    .m-btn--primary:hover {
        background: #de5c4a;
        transform: translateY(-1px);
        box-shadow: 0 12px 26px rgba(232, 112, 95, .34);
    }

    .m-btn--outline {
        background: var(--surface-card);
        color: var(--navy-700);
        border: 1.5px solid var(--border-hover);
    }

    .m-btn--outline:hover {
        border-color: var(--navy-500);
        background: var(--navy-100);
        transform: translateY(-1px);
    }

    @media (max-width: 860px) {
        .measure-cta__inner {
            grid-template-columns: 1fr;
            gap: var(--space-6);
        }
    }

    @media (max-width: 480px) {
        .container {
            padding: 0 var(--space-4);
        }

        .measure-cta {
            padding: var(--space-7) 0;
        }

        .m-btn {
            width: 100%;
            justify-content: center;
        }

        .measure-cta__actions {
            flex-direction: column;
        }
    }

    /* ===== Scroll-triggered reveal ===== */
    /* Elements start hidden; JS adds .is-visible to .measure-cta when it
       scrolls into view (or immediately on load if already in viewport). */

    .measure-cta [data-reveal] {
        opacity: 0;
        transform: translateY(28px);
        transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
    }

    .measure-cta.is-visible [data-reveal] {
        opacity: 1;
        transform: translateY(0);
    }

    .measure-cta__media[data-reveal] {
        transform: translateY(28px) scale(.96);
    }

    .measure-cta.is-visible .measure-cta__media[data-reveal] {
        transform: translateY(0) scale(1);
    }

    .measure-cta.is-visible [data-reveal="1"] {
        transition-delay: .05s;
    }

    .measure-cta.is-visible [data-reveal="2"] {
        transition-delay: .15s;
    }

    .measure-cta.is-visible [data-reveal="3"] {
        transition-delay: .25s;
    }

    .measure-cta.is-visible [data-reveal="4"] {
        transition-delay: .35s;
    }

    .measure-cta.is-visible [data-reveal="5"] {
        transition-delay: .45s;
    }

    @media (prefers-reduced-motion: reduce) {
        .measure-cta [data-reveal] {
            opacity: 1;
            transform: none;
            transition: none;
        }
    }


    /* =======================LUỒNG DỮ LIỆU VẬN HÀNH========================== */
    .section-head {
        text-align: center;
        max-width: 640px;
        margin: 0 auto var(--space-7);
    }

    .section-eyebrow {
        display: inline-flex;
        align-items: center;
        gap: var(--space-2);
        font-size: var(--text-xs);
        font-weight: 700;
        letter-spacing: .12em;
        text-transform: uppercase;
        color: var(--navy-500);
        margin-bottom: var(--space-3);
    }

    .section-title {
        font-size: var(--text-xl);
        font-weight: 800;
        line-height: 1.2;
        letter-spacing: -.01em;
        color: var(--navy-900);
    }

    /* ===== Luồng dữ liệu vận hành ===== */

    .flow-section {
        padding: var(--space-9) 0;
        background: var(--surface-page);
    }

    .flow-grid {
        display: grid;
        grid-template-columns: repeat(4, minmax(230px, 1fr));
        gap: var(--space-5);
    }

    .flow-card {
        position: relative;
        background: var(--surface-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        padding: var(--space-5) var(--space-5) var(--space-6);
        box-shadow: var(--shadow-sm);
        transition: transform var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
    }

    .flow-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-md);
    }

    .flow-card__num {
        font-size: 34px;
        font-weight: 800;
        line-height: 1;
        color: var(--coral-hex);
        margin-bottom: var(--space-3);
    }

    .flow-card__num span {
        font-size: 16px;
        font-weight: 700;
        color: var(--navy-300);
        margin-left: 2px;
    }

    .flow-card h3 {
        font-size: var(--text-md);
        font-weight: 700;
        color: var(--navy-900);
        margin-bottom: var(--space-2);
    }

    .flow-card p {
        font-size: var(--text-base);
        line-height: 1.55;
        color: var(--navy-300);
    }

    .flow-card__next {
        position: absolute;
        right: var(--space-4);
        bottom: var(--space-4);
        color: var(--navy-500);
        opacity: .35;
        font-size: 13px;
    }

    /* ===== Nguyên tắc Phase 1 ===== */

    .principles-section {
        padding: var(--space-9) 0;
        background: var(--surface-muted);
    }

    .principles-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: var(--space-5);
    }

    .principle-card {
        background: var(--surface-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        padding: var(--space-6) var(--space-5);
        box-shadow: var(--shadow-sm);
        transition: transform var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
    }

    .principle-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-md);
    }

    .principle-icon {
        width: 52px;
        height: 52px;
        border-radius: var(--radius-full);
        background: color-mix(in oklab, var(--coral-hex) 14%, white);
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: var(--space-4);
    }

    .principle-icon i {
        font-size: 19px;
        color: var(--coral-hex);
    }

    .principle-card h3 {
        font-size: var(--text-md);
        font-weight: 700;
        color: var(--navy-900);
        margin-bottom: var(--space-2);
    }

    .principle-card p {
        font-size: var(--text-base);
        line-height: 1.55;
        color: var(--navy-300);
    }

    @media (max-width: 640px) {

        .flow-grid,
        .principles-grid {
            grid-template-columns: 1fr;
        }

        .principle-card {
            padding: var(--space-5) var(--space-4);
            display: flex;
            align-items: flex-start;
            gap: var(--space-4);
        }

        .principle-icon {
            width: 44px;
            height: 44px;
            flex-shrink: 0;
            margin-bottom: 0;
        }

        .principle-icon i {
            font-size: 16px;
        }

        .principle-card h3 {
            font-size: var(--text-base);
            margin-bottom: var(--space-1);
        }

        .principle-card p {
            font-size: var(--text-sm);
        }

        .flow-card {
            padding: var(--space-4) var(--space-4) var(--space-5);
        }

        .flow-card__num {
            font-size: 28px;
        }

        .section-title {
            font-size: clamp(24px, 6vw, 32px);
        }
    }

    @media (max-width: 480px) {
        .container {
            padding: 0 var(--space-4);
        }

        .flow-section,
        .principles-section {
            padding: var(--space-7) 0;
        }

        .section-head {
            margin-bottom: var(--space-6);
        }
    }

    /* ===== Reveal on first load / on scroll =====
       Each section is observed independently: if it's already in the
       viewport on page load it animates immediately, otherwise it
       animates the first time the user scrolls it into view. */

    [data-reveal] {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity .6s var(--ease-out), transform .6s var(--ease-out);
    }

    .flow-section.is-visible [data-reveal],
    .principles-section.is-visible [data-reveal] {
        opacity: 1;
        transform: translateY(0);
    }

    @media (prefers-reduced-motion: reduce) {
        [data-reveal] {
            opacity: 1;
            transform: none;
            transition: none;
        }
    }

    /* =========================================
   GLOBAL RESPONSIVE
========================================= */

    html,
    body {
        overflow-x: hidden;
    }

    img {
        max-width: 100%;
        height: auto;
    }

    .container {
        width: 100%;
        max-width: 1400px;
        margin: 0 auto;
        padding-inline: clamp(16px, 4vw, 48px);
    }

    /* =========================================
   TABLET
========================================= */

    @media (min-width: 769px) and (max-width: 1024px) {

        .dn-hero {
            padding: 72px 0;
        }

        .dn-hero-inner {
            max-width: 100%;
        }

        .chi-so-row1 {
            grid-template-columns: repeat(2, 1fr);
        }

        .chi-so-row1 .chi-so-card:nth-child(3) {
            grid-column: 1 / -1;
        }

        .chi-so-row2 {
            max-width: 100%;
            grid-template-columns: repeat(2, 1fr);
        }

        .formula-grid {
            grid-template-columns: 1fr;
        }

        .formula-column:not(:last-child)::after {
            content: "↓";
            top: auto;
            right: 50%;
            bottom: -30px;
            transform: translateX(50%);
        }

        .measure-cta__inner {
            grid-template-columns: 1fr;
        }
    }

    /* =========================================
   MOBILE
========================================= */

    @media (max-width: 769px) {

        .dn-hero {
            padding: 60px 0 48px;
        }

        .dn-hero h1 {
            font-size: 34px;
            line-height: 1.15;
        }

        .dn-hero-sub {
            font-size: 15px;
            max-width: 100%;
            line-height: 1.7;
        }

        .dn-hero-actions {
            flex-direction: column;
            align-items: stretch;
        }

        .dn-btn {

            justify-content: center;
        }

        .section-5chi-so,
        .flow-section,
        .principles-section,
        .measure-cta {
            padding: 56px 0;
        }

        .hpa-headline,
        .section-title {
            font-size: 30px;
            line-height: 1.3;
        }

        .chi-so-row1,
        .chi-so-row2 {
            grid-template-columns: 1fr;
            gap: 16px;
        }

        .chi-so-card {
            padding: 20px;
            border-radius: 16px;
        }

        .card-top {
            margin-bottom: 16px;
        }

        .card-num {
            font-size: 36px;
        }

        .card-title {
            font-size: 16px;
        }

        .card-desc {
            font-size: 14px;
        }

        .formula-grid {
            grid-template-columns: 1fr;
            gap: 40px;
        }

        .formula-column {
            padding: 20px;
        }

        .formula-column h3 {
            font-size: 18px;
        }

        .formula-description {
            font-size: 14px;
        }

        .formula-column:not(:last-child)::after {
            content: "↓";
            top: auto;
            right: 50%;
            bottom: -24px;
            transform: translateX(50%);
        }

        .flow-grid,
        .principles-grid {
            grid-template-columns: 1fr;
            gap: 16px;
        }

        .flow-card {
            padding: 18px;
        }

        .flow-card__num {
            font-size: 28px;
        }

        .flow-card h3 {
            font-size: 16px;
        }

        .flow-card p {
            font-size: 14px;
        }

        .principle-card {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 18px;
        }

        .principle-icon {
            width: 42px;
            height: 42px;
            flex-shrink: 0;
        }

        .measure-cta__inner {
            grid-template-columns: 1fr;
            gap: 24px;
            padding: 16px;
        }

        .measure-cta__media-frame {
            aspect-ratio: 16/10;
        }

        .measure-cta__actions {
            flex-direction: column;
        }

        .m-btn {
            width: 100%;
            justify-content: center;
        }

        .principle-card {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .dn-hero-actions {
            display: flex;
            flex-direction: row;
        }

        .measure-cta__actions {
            display: flex;
            flex-direction: row;
            gap: var(--space-3);
        }
    }

    /* =========================================
   SMALL MOBILE
========================================= */

    @media (max-width: 480px) {

        :root {
            --space-4: 12px;
            --space-5: 18px;
            --space-6: 24px;
        }

        .container {
            padding-inline: 16px;
        }

        .dn-hero h1 {
            font-size: 30px;
        }

        .hpa-headline,
        .section-title {
            font-size: 26px;
        }

        .card-num {
            font-size: 32px;
        }

        .card-icon-wrap {
            width: 42px;
            height: 42px;
            font-size: 15px;
        }

        .card-title {
            font-size: 15px;
        }

        .card-desc,
        .formula-description,
        .flow-card p,
        .principle-card p {
            font-size: 13px;
        }

        .dn-btn,
        .m-btn {
            height: 46px;
            font-size: 14px;
        }

        .measure-cta__inner {
            border-radius: 16px;
        }

        .principle-card {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .principle-card {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }


    }

    /* =========================================
   IPHONE SE / 320px
========================================= */

    @media (max-width: 375px) {

        .dn-hero h1 {
            font-size: 28px;
        }

        .hpa-headline,
        .section-title {
            font-size: 24px;
        }

        .card-num {
            font-size: 28px;
        }

        .dn-btn,
        .m-btn {
            font-size: 13px;
            padding-inline: 12px;
        }

        .principle-card {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
    }

    /* ===================================================
   COMPARE TABLE
=================================================== */

    .compare-section {
        padding: var(--space-9) 0;
    }

    .compare-table {
        background: var(--surface-card);
        border-radius: var(--radius-xl);
        overflow: hidden;
        border: 1px solid var(--border);
        box-shadow: var(--shadow-sm);
    }

    .compare-grid {
        display: grid;
        grid-template-columns: 220px 1fr 1fr;
    }

    .compare-header {
        background: var(--surface-muted);
        font-weight: 700;
        color: var(--navy-900);
    }

    .compare-header>div,
    .compare-row>div {
        padding: 28px;
    }

    .compare-header .mamaliho-col {
        background: rgba(232, 112, 95, .08);
        color: var(--coral-hex);
        border-bottom: 3px solid var(--coral-hex);
    }

    .compare-row {
        background: white;
        border-top: 1px solid var(--border);
        transition: background .2s ease;
    }

    .compare-row:hover {
        background: rgba(232, 112, 95, .03);
    }

    .compare-label {
        font-weight: 700;
        color: var(--navy-900);
        background: var(--surface-muted);
    }

    .compare-row div:nth-child(2) {
        color: var(--teal-dark);
        font-weight: 500;
    }

    .compare-row div:nth-child(3) {
        color: var(--navy-300);
    }

    .compare-row div {
        line-height: 1.7;
        font-size: var(--text-base);
    }

    /* ===================================================
   TABLET
=================================================== */

    @media (max-width:1024px) {

        .compare-grid {
            grid-template-columns: 180px 1fr 1fr;
        }

        .compare-header>div,
        .compare-row>div {
            padding: 20px;
        }
    }

    /* ===================================================
   MOBILE
=================================================== */

    @media (max-width:768px) {

        .compare-table {
            display: flex;
            flex-direction: column;
            gap: 16px;
            background: none;
            border: none;
            box-shadow: none;
        }

        .compare-header {
            display: none;
        }

        .compare-row {
            display: block;
            border: none;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            background: white;
        }

        .compare-label {
            background: var(--surface-muted);
            color: var(--navy-900);
            font-weight: 700;
            border-left: 4px solid var(--coral-hex);
        }

        .compare-row div:nth-child(2),
        .compare-row div:nth-child(3) {
            padding: 18px;
        }

        .compare-row div:nth-child(2)::before {
            content: "Mamaliho Index";

            display: inline-flex;
            align-items: center;

            padding: 4px 10px;
            margin-bottom: 10px;

            border-radius: 999px;

            background: rgba(232, 112, 95, .08);
            color: var(--coral-hex);

            font-size: 11px;
            font-weight: 700;
            letter-spacing: .08em;
        }

        .compare-row div:nth-child(3)::before {
            content: "KPI / OKR";

            display: inline-flex;
            align-items: center;

            padding: 4px 10px;
            margin-bottom: 10px;

            border-radius: 999px;

            background: rgba(74, 111, 165, .08);
            color: var(--navy-500);

            font-size: 11px;
            font-weight: 700;
            letter-spacing: .08em;
        }

        .compare-row div:nth-child(2) {
            border-bottom: 1px solid var(--border);
        }

        .compare-row:hover {
            background: white;
        }

        .compare-row:hover .compare-label {
            border-left-width: 6px;
        }
    }

    /* ===================================================
   SMALL MOBILE
=================================================== */

    @media (max-width:480px) {

        .compare-row div:nth-child(2),
        .compare-row div:nth-child(3) {
            padding: 16px;
            font-size: 14px;
        }

        .compare-label {
            font-size: 14px;
        }
    }

    .compare-row div:nth-child(2) {
        position: relative;
    }

    .compare-section.is-visible .compare-row div:nth-child(2) {
        animation: mamalihoPulse .8s ease-out forwards;
    }

    @keyframes mamalihoPulse {

        0% {
            transform: scale(.96);
        }

        70% {
            transform: scale(1.02);
        }

        100% {
            transform: scale(1);
        }
    }