:root {
            --nga: #F4EFE6;         /* Nền Ngà Văn Khố Di Sản */
            --nga-card: #FAF6EF;    /* Ngà Thẻ Lưu Trữ Thể Chế */
            --nga-warm: #ECE5D8;    /* Ngà Ngả Ấm */
            --than: #1F1B18;        /* Than Ấn Obsidian */
            --than-elevated: #28231F;
            --than-dark: #14110F;
            --son: #BF201A;         /* Son Triện Đỏ Thể Chế (<10%) */
            --nau-moc: #6B5A48;     /* Nâu Mộc Masthead */
            --greige: #D9D2C5;      /* Greige Đường Viền Phân Tách */
            --son-glow: rgba(191, 32, 26, 0.28);
            --son-beam: rgba(191, 32, 26, 0.45);
            --border-heavy: 2px solid #1F1B18;
            --border-line: rgba(31, 27, 24, 0.16);
            --font-heading: 'Lora', 'Georgia', 'Times New Roman', serif;
            --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* Luxury Institutional Scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--nga);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--greige);
            border-radius: 4px;
            border: 2px solid var(--nga);
            transition: background 0.25s ease;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--son);
        }

        /* Selection Color */
        ::selection {
            background: var(--son);
            color: var(--nga-card);
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 76px;
        }

        body {
            background-color: var(--nga);
            color: var(--than);
            font-family: var(--font-body);
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
            line-height: 1.7;
            letter-spacing: 0.03em; /* Tracking +3% chuẩn Brandbook Trang 6 */
            position: relative;
        }

        p {
            line-height: 1.75;
            letter-spacing: 0.03em; /* Tracking +3% chuẩn Brandbook Trang 6 */
        }

        /* Clear anchor scroll margin under kinetic header */
        section[id], 
        .sp-benchmark-strip[id], 
        .spatial-partners-dock[id] {
            scroll-margin-top: 76px;
        }
        #roadmap {
            scroll-margin-top: 0 !important;
        }

        /* Ambient Dó Paper & Dynamic Light Canvas */
        #ambientDopaperCanvas {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            pointer-events: none !important;
            z-index: 1;
            opacity: 0.95;
        }

        /* Root Page Wrapper above Canvas */
        .page-root {
            position: relative;
            z-index: 2;
        }

        /* Stamp Shake Animation applied to Page Root (never on document.body) */
        @keyframes stampRootShake {
            0% { transform: translate(0, 0); }
            25% { transform: translate(1.5px, -1.5px); }
            50% { transform: translate(-1.5px, 1px); }
            75% { transform: translate(1px, -0.5px); }
            100% { transform: translate(0, 0); }
        }
        .stamp-root-shaking {
            animation: stampRootShake 0.12s ease-out forwards;
        }

        /* Top Progress Indicator */
        .top-progress-bar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: rgba(31, 27, 24, 0.08);
            z-index: 10005;
            pointer-events: none !important;
        }
        .top-progress-fill {
            height: 100%;
            width: 0%;
            background: var(--son);
            box-shadow: 0 0 10px var(--son);
            transition: width 0.05s linear;
            pointer-events: none !important;
        }

        /* Interactive Cyber-Heritage Laser Cursor & Telemetry HUD */
        .laser-cursor-dot {
            position: fixed;
            top: 0; left: 0;
            width: 8px;
            height: 8px;
            background: var(--son);
            border-radius: 50%;
            pointer-events: none !important;
            z-index: 10002;
            transform: translate(-50%, -50%);
            box-shadow: 0 0 12px var(--son), 0 0 24px var(--son);
            transition: opacity 0.2s ease, transform 0.08s linear;
        }
        .laser-tracer-ring {
            position: fixed;
            top: 0; left: 0;
            width: 42px;
            height: 42px;
            border: 1.5px solid var(--son-beam);
            pointer-events: none !important;
            z-index: 10001;
            transform: translate(-50%, -50%);
            transition: width 0.3s var(--ease-out-expo), height 0.3s var(--ease-out-expo), border-color 0.3s ease, background 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .laser-tracer-ring::before, .laser-tracer-ring::after {
            content: '';
            position: absolute;
            background: var(--son);
            opacity: 0.4;
            pointer-events: none !important;
        }
        .laser-tracer-ring::before { width: 100%; height: 1px; top: 50%; }
        .laser-tracer-ring::after { height: 100%; width: 1px; left: 50%; }

        .laser-cursor-label {
            font-size: 0.58rem;
            letter-spacing: 0.16em;
            font-weight: 800;
            text-transform: uppercase;
            color: var(--son);
            opacity: 0;
            transition: opacity 0.2s ease;
            pointer-events: none !important;
            white-space: nowrap;
            background: var(--nga-card);
            padding: 1px 4px;
            border: 1px solid var(--son);
            z-index: 2;
        }

        .laser-coords-hud {
            position: fixed;
            top: 0; left: 0;
            pointer-events: none !important;
            z-index: 10001;
            transform: translate(24px, 20px);
            font-family: var(--font-body);
            font-feature-settings: "tnum" 1;
            font-size: 0.64rem;
            letter-spacing: 0.14em;
            font-weight: 700;
            color: var(--than);
            background: rgba(250, 246, 239, 0.9);
            border: 1px solid var(--border-line);
            padding: 2px 6px;
            white-space: nowrap;
            box-shadow: 0 4px 10px rgba(31, 27, 24, 0.06);
            opacity: 0.85;
            transition: opacity 0.3s;
        }
        .laser-coords-hud span {
            color: var(--son);
            font-weight: 700;
        }

        .laser-tracer-ring.active-hover {
            width: 62px;
            height: 62px;
            background: rgba(191, 32, 26, 0.08);
            border-color: var(--son);
        }
        .laser-tracer-ring.active-hover .laser-cursor-label {
            opacity: 1;
        }
        .laser-tracer-ring.active-drag {
            width: 80px;
            height: 36px;
            border-radius: 4px;
            background: var(--than);
            border-color: var(--than);
        }
        .laser-tracer-ring.active-drag .laser-cursor-label {
            opacity: 1;
            color: var(--nga);
            background: transparent;
            border: none;
        }
        .laser-tracer-ring.active-stamp {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            border: 2px dashed var(--son);
            background: rgba(191, 32, 26, 0.14);
            box-shadow: 0 0 24px var(--son-glow);
            animation: laserStampPulse 1.2s infinite alternate ease-in-out;
        }
        @keyframes laserStampPulse {
            0% { transform: scale(1); box-shadow: 0 0 16px var(--son-glow); }
            100% { transform: scale(1.08); box-shadow: 0 0 28px var(--son-glow); }
        }
        .laser-tracer-ring.active-stamp .laser-cursor-label {
            opacity: 1;
            color: var(--son);
            font-weight: 900;
            border-color: var(--son);
            background: var(--nga-card);
        }

        @media (pointer: coarse), (hover: none) {
            .laser-cursor-dot, .laser-tracer-ring, .laser-coords-hud {
                display: none !important;
            }
        }

        /* Fixed Luminous Spatial Spine Thread & Checkpoint Nodes */
        .spatial-spine-thread {
            position: fixed;
            top: 76px;
            left: 2.25rem;
            width: 2px;
            height: calc(100vh - 76px);
            background: rgba(31, 27, 24, 0.1);
            z-index: 90;
            pointer-events: none !important;
        }
        .spatial-spine-active {
            width: 100%;
            height: 0%;
            background: var(--son);
            box-shadow: 0 0 10px var(--son);
            will-change: height;
            pointer-events: none !important;
        }
        .spatial-spine-nodes {
            position: fixed;
            top: 76px;
            left: 2.25rem;
            height: calc(100vh - 76px);
            display: flex;
            flex-direction: column;
            justify-content: space-around;
            transform: translateX(-50%);
            z-index: 91;
            pointer-events: auto;
        }
        .spine-node-point {
            width: 10px;
            height: 10px;
            background: var(--nga-warm);
            border: 1.5px solid var(--than);
            transform: rotate(45deg);
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            position: relative;
        }
        .spine-node-point::after {
            content: attr(data-label);
            position: absolute;
            left: 18px;
            top: 50%;
            transform: translateY(-50%) rotate(-45deg);
            font-size: 0.62rem;
            letter-spacing: 0.16em;
            text-transform: uppercase;
            font-weight: 800;
            color: var(--than);
            background: var(--nga-card);
            border: 1px solid var(--border-line);
            padding: 2px 8px;
            opacity: 0;
            pointer-events: none;
            white-space: nowrap;
            transition: opacity 0.25s, transform 0.25s;
        }
        .spine-node-point:hover::after {
            opacity: 1;
            transform: translateY(-50%) rotate(0deg);
        }
        .spine-node-point.active {
            background: var(--son);
            border-color: var(--son);
            box-shadow: 0 0 10px var(--son);
            transform: rotate(45deg) scale(1.3);
        }

        /* Tactile Wax Seal Stamping Overlay & Shockwave */
        #waxSealOverlay {
            position: fixed;
            pointer-events: none !important;
            z-index: 10006;
            display: none;
            width: 120px;
            height: 120px;
            transform: translate(-50%, -50%);
        }
        .wax-seal-burst-ring {
            position: absolute;
            inset: -20px;
            border: 2px solid var(--son);
            border-radius: 50%;
            opacity: 0;
            transform: scale(0.6);
            pointer-events: none !important;
        }
        .wax-seal-body {
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 35% 30%, #E23832 0%, #BF201A 60%, #80120E 100%);
            border-radius: 50%;
            box-shadow: 0 12px 35px rgba(191, 32, 26, 0.5), inset 0 3px 6px rgba(250, 246, 239, 0.35), inset 0 -4px 8px rgba(31, 27, 24, 0.45);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #FAF6EF;
            border: 3px solid #8E1511;
            position: relative;
            transform-origin: center center;
            pointer-events: none !important;
        }
        .wax-seal-inner-mark {
            border: 1.5px dashed rgba(250, 246, 239, 0.85);
            width: 82%;
            height: 82%;
            border-radius: 50%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            line-height: 1.1;
            pointer-events: none !important;
        }
        .wax-seal-inner-mark .seal-title {
            font-family: var(--font-heading);
            font-size: 0.68rem;
            font-weight: 700;
            letter-spacing: 0.16em;
            text-transform: uppercase;
        }
        .wax-seal-inner-mark .seal-year {
            font-size: 0.58rem;
            letter-spacing: 0.2em;
            font-weight: 800;
            margin-top: 2px;
        }

        /* Kinetic Fixed Header */
        header {
            position: fixed;
            top: 0; left: 0; right: 0;
            height: 76px;
            padding: 0 8.5vw;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 1000;
            background: rgba(244, 239, 230, 0.94);
            backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-line);
        }

        .header-brand {
            display: flex;
            align-items: center;
            gap: 1.25rem;
            text-decoration: none;
            color: var(--than);
        }

        .diamond-seal-frame {
            width: 42px;
            height: 42px;
            border: 2px solid var(--son);
            transform: rotate(45deg);
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--than);
            box-shadow: 0 4px 14px var(--son-glow);
            overflow: hidden;
            transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
            position: relative;
            flex-shrink: 0;
        }
        .header-brand:hover .diamond-seal-frame {
            transform: rotate(405deg);
        }
        .diamond-seal-frame img {
            width: 140%;
            height: 140%;
            object-fit: cover;
            transform: rotate(-45deg);
            transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .header-brand:hover .diamond-seal-frame img {
            transform: rotate(-405deg);
        }

        .brand-text-cluster {
            display: flex;
            flex-direction: column;
        }
        .brand-name {
            font-family: var(--font-heading);
            font-size: 1.25rem;
            font-weight: 700;
            line-height: 1.1;
            letter-spacing: 0.14em;
            text-transform: uppercase;
        }
        .brand-meta-tag {
            font-size: 0.65rem;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            color: var(--son);
            font-weight: 800;
        }
        .brand-meta-tag span {
            color: rgba(31, 27, 24, 0.65);
            font-weight: 600;
        }

        .nav-links-menu {
            display: flex;
            gap: 2.25rem;
            list-style: none;
        }
        .nav-links-menu a {
            text-decoration: none;
            color: var(--than);
            font-size: 0.78rem;
            letter-spacing: 0.16em;
            text-transform: uppercase;
            font-weight: 700;
            position: relative;
            padding-bottom: 4px;
            transition: color 0.3s;
        }
        .nav-links-menu a::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0; width: 0; height: 2px;
            background: var(--son);
            transition: width 0.3s ease;
        }
        .nav-links-menu a:hover {
            color: var(--son);
        }
        .nav-links-menu a:hover::after {
            width: 100%;
        }

        .btn-header-flagship {
            background: var(--than);
            color: var(--nga);
            text-decoration: none;
            padding: 0.75rem 1.6rem;
            font-size: 0.74rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            border: 1px solid var(--than);
            box-shadow: 0 4px 14px rgba(31, 27, 24, 0.15);
            transition: all 0.3s ease;
            white-space: nowrap;
        }
        .btn-header-flagship:hover {
            background: var(--son);
            border-color: var(--son);
            box-shadow: 0 6px 20px var(--son-glow);
            transform: translateY(-2px);
        }
        .btn-domain-badge {
            font-size: 0.7rem;
            font-weight: 800;
            letter-spacing: 0.15em;
            color: var(--son);
            border: 1px solid var(--son);
            padding: 0.38rem 0.75rem;
            text-decoration: none;
            border-radius: 2px;
            background: rgba(191, 32, 26, 0.06);
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            transition: all 0.25s ease;
            white-space: nowrap;
        }
        .btn-domain-badge:hover {
            background: var(--son);
            color: var(--nga-card);
            box-shadow: 0 4px 14px var(--son-glow);
            transform: translateY(-1px);
        }

        /* Language Switcher (VN / EN) */
        .lang-switcher {
            display: inline-flex;
            align-items: center;
            background: rgba(31, 27, 24, 0.05);
            border: 1px solid var(--border-line);
            border-radius: 2px;
            padding: 2px;
            gap: 2px;
        }
        .lang-btn {
            border: none;
            background: transparent;
            color: var(--than);
            font-family: var(--font-body);
            font-size: 0.68rem;
            font-weight: 800;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            padding: 0.32rem 0.65rem;
            border-radius: 2px;
            cursor: pointer;
            transition: all 0.22s ease;
            opacity: 0.65;
        }
        .lang-btn:hover {
            opacity: 1;
            color: var(--son);
        }
        .lang-btn.active {
            background: var(--than);
            color: var(--nga-card);
            opacity: 1;
            box-shadow: 0 2px 8px rgba(31, 27, 24, 0.18);
        }
        .lang-divider {
            color: rgba(31, 27, 24, 0.25);
            font-size: 0.65rem;
            font-weight: 700;
            user-select: none;
        }

        /* Typography & Utility */
        h1, h2, h3, h4 {
            font-family: var(--font-heading);
            font-weight: 400;
            color: var(--than);
            line-height: 1.15;
        }

        .spatial-tag {
            font-size: 0.72rem;
            letter-spacing: 0.24em;
            text-transform: uppercase;
            color: var(--son);
            font-weight: 800;
            display: inline-flex;
            align-items: center;
            gap: 0.65rem;
            margin-bottom: 1.25rem;
        }
        .spatial-tag::before {
            content: '';
            width: 16px;
            height: 2px;
            background: var(--son);
        }

        /* 1. HERO SECTION: 3D Kinetic Spatial Portal */
        .hero-spatial-stage {
            padding: 9rem 8.5vw 5rem 8.5vw;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
        }

        .hero-floating-pill {
            display: inline-flex;
            align-items: center;
            gap: 0.65rem;
            padding: 0.45rem 1.4rem;
            border: 1px solid var(--son);
            color: var(--son);
            font-size: 0.72rem;
            letter-spacing: 0.22em;
            text-transform: uppercase;
            font-weight: 800;
            margin-bottom: 1.75rem;
            background: rgba(191, 32, 26, 0.04);
            width: fit-content;
        }
        .hero-floating-pill .dot {
            width: 6px;
            height: 6px;
            background: var(--son);
            transform: rotate(45deg);
        }

        .hero-title-spatial {
            font-size: clamp(2.8rem, 6.4vw, 6.2rem);
            font-weight: 400;
            line-height: 1.05;
            letter-spacing: -0.03em;
            margin-bottom: 2rem;
            text-transform: uppercase;
        }
        .hero-title-spatial .word-mask {
            display: inline-block;
            overflow: hidden;
            vertical-align: top;
        }
        .hero-title-spatial .word-inner {
            display: inline-block;
            transform: translateY(0);
            color: var(--than);
            font-style: normal;
        }
        .hero-title-spatial .word-inner .son-highlight,
        .hero-title-spatial .word-inner span {
            color: var(--son);
            font-style: italic;
        }

        .hero-quote-spatial {
            font-family: var(--font-heading);
            font-size: clamp(1.15rem, 2vw, 1.65rem);
            color: var(--than);
            line-height: 1.45;
            max-width: 960px;
            margin-bottom: 2rem;
            border-left: 3px solid var(--son);
            padding-left: 1.5rem;
        }
        .hero-quote-spatial em {
            color: var(--son);
            font-style: italic;
        }

        .hero-callout-passive {
            display: block;
            font-family: var(--font-heading);
            font-style: italic;
            font-size: clamp(1.15rem, 2.2vw, 1.75rem);
            color: var(--son);
            margin-top: 0.75rem;
            margin-bottom: 1.25rem;
            letter-spacing: 0.01em;
            line-height: 1.35;
        }

        .hero-subheadline-text {
            font-size: 1.05rem;
            line-height: 1.75;
            color: rgba(31, 27, 24, 0.82);
            max-width: 920px;
            margin-bottom: 2rem;
        }

        .hero-cta-reach-box {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1.5rem;
            padding: 1.25rem 1.75rem;
            background: rgba(31, 27, 24, 0.03);
            border: 1px solid var(--border-line);
            border-left: 3px solid var(--son);
            margin-bottom: 3.5rem;
            flex-wrap: wrap;
        }
        .hero-reach-left {
            display: flex;
            flex-direction: column;
            gap: 0.35rem;
        }
        .hero-reach-tag {
            font-size: 0.72rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            color: var(--son);
        }
        .hero-reach-text {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--than);
        }
        .hero-reach-logos-micro {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .hero-reach-logos-micro img {
            height: 24px;
            max-width: 75px;
            object-fit: contain;
            filter: grayscale(100%) opacity(0.8);
            transition: filter 0.3s ease;
        }
        .hero-reach-logos-micro img:hover {
            filter: grayscale(0%) opacity(1);
        }
        .hero-reach-badge-dn {
            font-size: 0.75rem;
            font-weight: 800;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--than);
            background: rgba(31, 27, 24, 0.06);
            padding: 4px 8px;
            border-radius: 2px;
            border: 1px solid var(--border-line);
        }

        .hero-portal-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 4rem;
            align-items: center;
        }

        .hero-portal-wrap {
            perspective: 1400px;
            transform-style: preserve-3d;
            will-change: transform;
        }

        .hero-spatial-card-3d {
            border: 2px solid var(--than);
            padding: 1.5rem;
            background: var(--nga-card);
            box-shadow: 0 30px 80px rgba(31, 27, 24, 0.12);
            transform-style: preserve-3d;
            will-change: transform;
            position: relative;
        }
        .hero-spatial-card-3d::after {
            content: "";
            position: absolute;
            inset: 6px;
            border: 1px dashed rgba(31, 27, 24, 0.2);
            pointer-events: none;
        }

        .hero-card-viewport {
            width: 100%;
            height: 420px;
            overflow: hidden;
            position: relative;
            background: var(--than);
        }
        .hero-card-viewport img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: contrast(106%);
            transition: transform 0.8s ease;
        }
        .hero-spatial-card-3d:hover .hero-card-viewport img {
            transform: scale(1.05);
        }

        /* Glass Specular Sheen */
        .hero-specular-sheen {
            position: absolute;
            inset: 0;
            pointer-events: none;
            background: linear-gradient(115deg, rgba(250, 246, 239, 0.25) 0%, rgba(250, 246, 239, 0.03) 40%, transparent 60%);
            transition: background 0.15s ease;
            z-index: 3;
        }

        .hero-card-caption-bar {
            margin-top: 1.25rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .hero-card-caption-bar h4 {
            font-size: 1.05rem;
            color: var(--than);
        }
        .hero-card-caption-bar span {
            font-size: 0.72rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            color: var(--son);
            font-weight: 800;
        }

        /* Spatial Radar HUD Preview */
        .spatial-radar-hud {
            background: var(--nga-card);
            border: 2px solid var(--than);
            padding: 2.5rem 2rem;
            box-shadow: 0 20px 60px rgba(31, 27, 24, 0.08);
            position: relative;
        }
        .radar-hud-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid var(--border-line);
            padding-bottom: 1rem;
            margin-bottom: 1.5rem;
        }
        .radar-hud-header h3 {
            font-size: 1.35rem;
        }
        .radar-score-flag {
            font-family: var(--font-heading);
            font-size: 1.8rem;
            color: var(--son);
            font-weight: 700;
        }

        .radar-bars-hud {
            display: flex;
            flex-direction: column;
            gap: 1.15rem;
            margin-bottom: 2rem;
        }
        .bar-hud-unit {
            display: flex;
            flex-direction: column;
            gap: 0.35rem;
        }
        .bar-hud-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.76rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }
        .bar-hud-track {
            width: 100%;
            height: 6px;
            background: rgba(31, 27, 24, 0.08);
            overflow: hidden;
        }
        .bar-hud-fill {
            height: 100%;
            background: var(--than);
            transition: width 1s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .bar-hud-fill.son-tint {
            background: var(--son);
            box-shadow: 0 0 8px var(--son-glow);
        }

        .btn-spatial-sim-toggle {
            background: transparent;
            border: 1px dashed var(--son);
            color: var(--son);
            font-family: var(--font-body);
            font-size: 0.72rem;
            letter-spacing: 0.16em;
            text-transform: uppercase;
            font-weight: 800;
            padding: 0.55rem 1rem;
            cursor: pointer;
            width: 100%;
            transition: all 0.25s;
            margin-bottom: 1.25rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }
        .btn-spatial-sim-toggle:hover {
            background: rgba(191, 32, 26, 0.06);
            border-style: solid;
        }

        .spatial-sim-drawer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, opacity 0.3s;
            opacity: 0;
            background: var(--nga-warm);
            border: 1px solid var(--border-line);
            padding: 0 1rem;
            margin-bottom: 0;
        }
        .spatial-sim-drawer.open {
            max-height: 340px;
            opacity: 1;
            padding: 1.25rem 1rem;
            margin-bottom: 1.25rem;
        }
        .spatial-sim-row {
            margin-bottom: 0.85rem;
        }
        .spatial-sim-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.72rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--than);
            margin-bottom: 0.25rem;
        }
        .spatial-sim-range {
            width: 100%;
            accent-color: var(--son);
            cursor: pointer;
            height: 4px;
        }
        .spatial-sim-status {
            font-size: 0.7rem;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            font-weight: 800;
            padding: 0.5rem;
            border: 1px solid var(--than);
            color: var(--than);
            text-align: center;
            margin-bottom: 0.85rem;
            background: rgba(31, 27, 24, 0.05);
        }
        .spatial-sim-status.qualified {
            border-color: var(--son);
            color: var(--son);
            background: rgba(191, 32, 26, 0.08);
        }

        .hero-cta-button-group {
            display: flex;
            gap: 1.5rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .btn-son-spatial {
            background: var(--son);
            color: var(--nga-card);
            padding: 1.15rem 2.4rem;
            font-size: 0.8rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            text-decoration: none;
            border: 1px solid var(--son);
            box-shadow: 0 8px 24px var(--son-glow);
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
            cursor: pointer;
        }
        .btn-son-spatial:hover {
            background: var(--than);
            border-color: var(--than);
            box-shadow: 0 12px 36px rgba(31, 27, 24, 0.25);
            transform: translateY(-2px);
        }
        .hero-sub-link {
            color: var(--than);
            font-weight: 800;
            font-size: 0.82rem;
            letter-spacing: 0.15em;
            text-transform: uppercase;
            text-decoration: underline;
            text-underline-offset: 4px;
            transition: color 0.2s;
        }
        .hero-sub-link:hover {
            color: var(--son);
        }

        /* 2. VALUES SECTION: 3D SPATIAL BENTO DECK (Tinh Tươm 5 Suite) */
        .values-spatial-section {
            padding: 8rem 8.5vw;
            border-top: 1px solid var(--border-line);
            position: relative;
        }

        .values-heading-block {
            max-width: 860px;
            margin-bottom: 4.5rem;
        }
        .values-heading-block h2 {
            font-size: clamp(2.4rem, 5vw, 4.2rem);
            margin-bottom: 1.25rem;
        }
        .values-heading-block p {
            font-size: 1.12rem;
            color: rgba(31, 27, 24, 0.8);
            line-height: 1.75;
        }

        /* Bento 5-Suite Architecture */
        .spatial-bento-grid {
            display: grid;
            grid-template-columns: repeat(12, 1fr);
            gap: 2rem;
            perspective: 1200px;
        }

        .spatial-bento-item {
            background: var(--nga-card);
            border: 2px solid var(--than);
            padding: 3.25rem 2.5rem;
            box-shadow: 0 20px 50px rgba(31, 27, 24, 0.08);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            position: relative;
            transform-style: preserve-3d;
            transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.35s ease, border-color 0.3s ease;
        }
        .spatial-bento-item::after {
            content: '';
            position: absolute;
            top: 0; left: 0; width: 0; height: 4px;
            background: var(--son);
            transition: width 0.4s ease;
        }
        .spatial-bento-item:hover {
            transform: translateY(-8px) translateZ(10px);
            box-shadow: 0 30px 70px rgba(31, 27, 24, 0.15);
            border-color: var(--son);
        }
        .spatial-bento-item:hover::after {
            width: 100%;
        }

        .s-col-7 { grid-column: span 7; }
        .s-col-5 { grid-column: span 5; }
        .s-col-4 { grid-column: span 4; }

        .deck-numeral {
            font-family: var(--font-heading);
            font-size: 3.8rem;
            line-height: 0.85;
            color: var(--son);
            margin-bottom: 1.25rem;
        }
        .spatial-bento-item h3 {
            font-size: 2rem;
            margin-bottom: 1rem;
        }
        .spatial-bento-item p {
            font-size: 1.02rem;
            line-height: 1.75;
            color: rgba(31, 27, 24, 0.85);
            margin-bottom: 2rem;
        }

        .deck-tags-flex {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
            border-top: 1px solid var(--border-line);
            padding-top: 1.25rem;
            margin-top: auto;
        }
        .deck-tag-pill {
            padding: 0.45rem 1.1rem;
            border: 1px solid var(--border-line);
            font-size: 0.72rem;
            letter-spacing: 0.16em;
            text-transform: uppercase;
            font-weight: 800;
            color: var(--than);
            background: var(--nga-warm);
            transition: all 0.2s;
        }
        .spatial-bento-item:hover .deck-tag-pill {
            border-color: var(--son);
            color: var(--son);
        }

        /* Partners Dock */
        .spatial-partners-dock {
            margin-top: 5rem;
            background: var(--than);
            color: var(--nga-card);
            padding: 3rem 4rem;
            border: 2px solid var(--than);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .spatial-partners-dock h4 {
            font-size: 1.05rem;
            text-transform: uppercase;
            letter-spacing: 0.18em;
            color: var(--nga-card);
            font-weight: 800;
        }
        .spatial-partners-logos {
            display: flex;
            align-items: center;
            gap: 2.5rem;
        }
        .partner-dock-item {
            background: var(--nga-card);
            padding: 0.65rem 1.5rem;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--greige);
            box-shadow: 0 2px 8px rgba(20, 17, 15, 0.25);
            transition: all 0.3s ease;
        }
        .partner-dock-item:hover {
            border-color: rgba(244, 239, 230, 0.6);
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(20, 17, 15, 0.4);
            background: var(--nga-warm);
        }
        .partner-dock-item img {
            max-height: 34px;
            max-width: 130px;
            object-fit: contain;
            filter: grayscale(100%) contrast(120%) opacity(0.85);
            transition: all 0.3s ease;
        }
        .partner-dock-item:hover img {
            filter: grayscale(25%) contrast(105%) opacity(1);
            transform: scale(1.05);
        }

        /* 3. PERSONA & COMPARISON SECTION: 3D POLAR CONTRAST FLIP (CV Truyền Thống vs Tinh Tươm Profile) */
        .persona-spatial-stage {
            padding: 8rem 8.5vw;
            border-top: 1px solid var(--border-line);
        }

        .flip-cards-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3.5rem;
            margin-top: 4.5rem;
            perspective: 1400px;
        }

        .flip-card-3d {
            height: 560px;
            min-height: 560px;
            position: relative;
            transform-style: preserve-3d;
            transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
            cursor: pointer;
        }
        .flip-card-3d.flipped {
            transform: rotateY(180deg);
        }

        .flip-face {
            position: absolute;
            inset: 0;
            backface-visibility: hidden;
            border: 2px solid var(--than);
            padding: 3.5rem 3rem;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: 0 20px 50px rgba(31, 27, 24, 0.08);
        }

        .flip-face.front-traditional {
            background: var(--nga-card);
        }
        .flip-face.back-institutional {
            background: var(--than);
            color: var(--nga-card);
            transform: rotateY(180deg);
            border-color: var(--son);
            box-shadow: 0 25px 70px rgba(191, 32, 26, 0.25);
        }

        .flip-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.72rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            padding: 0.4rem 1rem;
            width: fit-content;
            margin-bottom: 1.5rem;
        }
        .front-traditional .flip-badge {
            background: rgba(31, 27, 24, 0.08);
            color: rgba(31, 27, 24, 0.7);
        }
        .back-institutional .flip-badge {
            background: rgba(191, 32, 26, 0.15);
            color: var(--son);
            border: 1px solid var(--son);
        }

        .flip-face h3 {
            font-size: 2.4rem;
            margin-bottom: 1rem;
        }
        .front-traditional h3 { color: var(--than); }
        .back-institutional h3 { color: var(--nga-card); }

        .flip-face p.desc {
            font-size: 1.05rem;
            line-height: 1.7;
            margin-bottom: 1.75rem;
        }
        .front-traditional p.desc { color: rgba(31, 27, 24, 0.8); }
        .back-institutional p.desc { color: rgba(244, 239, 230, 0.75); }

        .flip-points-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .flip-points-list li {
            font-size: 0.98rem;
            line-height: 1.6;
            display: flex;
            gap: 0.85rem;
            align-items: flex-start;
        }
        .front-traditional .flip-points-list li::before {
            content: "—";
            color: rgba(31, 27, 24, 0.4);
            font-size: 1.2rem;
        }
        .back-institutional .flip-points-list li::before {
            content: "✦";
            color: var(--son);
            font-size: 1.1rem;
        }

        .flip-hint-bar {
            font-size: 0.72rem;
            letter-spacing: 0.16em;
            text-transform: uppercase;
            font-weight: 800;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            border-top: 1px solid var(--border-line);
            padding-top: 1rem;
            margin-top: auto;
        }
        .front-traditional .flip-hint-bar { color: var(--son); }
        .back-institutional .flip-hint-bar { color: rgba(244, 239, 230, 0.6); }

        /* Section 3 Institutional Matrix Table */
        .spatial-matrix-deck {
            margin-top: 4.5rem;
            background: var(--nga-card);
            border: 2px solid var(--than);
            box-shadow: 0 20px 50px rgba(31, 27, 24, 0.08);
            overflow: hidden;
            width: 100%;
        }
        .spatial-matrix-header {
            padding: 2rem 2.5rem 1.5rem;
            border-bottom: 2px solid var(--than);
            background: var(--nga-warm);
        }
        .spatial-matrix-scroll {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }
        .spatial-matrix-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.92rem;
            min-width: 680px;
        }
        .spatial-matrix-table th {
            padding: 1.25rem 2rem;
            text-align: left;
            font-size: 0.78rem;
            letter-spacing: 0.16em;
            text-transform: uppercase;
            font-weight: 800;
            background: var(--nga-warm);
            border-bottom: 2px solid var(--than);
            color: var(--than);
        }
        .spatial-matrix-table td {
            padding: 1.35rem 2rem;
            border-bottom: 1px solid var(--border-line);
            line-height: 1.6;
        }
        .spatial-matrix-table tr:last-child td {
            border-bottom: none;
        }
        .spatial-matrix-table .col-crit {
            font-weight: 800;
            color: var(--than);
            background: rgba(31, 27, 24, 0.02);
            border-right: 1px solid var(--border-line);
            font-size: 0.85rem;
        }
        .spatial-matrix-table .col-bad {
            color: rgba(31, 27, 24, 0.7);
            border-right: 1px solid var(--border-line);
        }
        .spatial-matrix-table .col-bad::before {
            content: "✕ ";
            color: rgba(31, 27, 24, 0.4);
            font-weight: 900;
        }
        .spatial-matrix-table .col-good {
            color: var(--than);
            font-weight: 600;
            background: rgba(191, 32, 26, 0.02);
        }
        .spatial-matrix-table .col-good::before {
            content: "✓ ";
            color: var(--son);
            font-weight: 900;
        }

        /* Persona Table 2-Column Styles (Image 1 Spec) */
        .spatial-matrix-table .col-fit-good {
            background: rgba(191, 32, 26, 0.02);
            border-right: 1px solid var(--border-line);
            vertical-align: top;
            padding: 1.5rem 2rem;
        }
        .spatial-matrix-table .col-fit-good strong {
            display: block;
            font-family: var(--font-heading);
            font-size: 1.08rem;
            color: var(--than);
            margin-bottom: 0.35rem;
            line-height: 1.3;
        }
        .spatial-matrix-table .col-fit-good strong::before {
            content: "✓ ";
            color: var(--son);
            font-weight: 900;
        }
        .spatial-matrix-table .col-fit-bad {
            background: transparent;
            vertical-align: top;
            padding: 1.5rem 2rem;
            color: rgba(31, 27, 24, 0.78);
        }
        .spatial-matrix-table .col-fit-bad strong {
            display: block;
            font-family: var(--font-heading);
            font-size: 1.08rem;
            color: rgba(31, 27, 24, 0.9);
            margin-bottom: 0.35rem;
            line-height: 1.3;
        }
        .spatial-matrix-table .col-fit-bad strong::before {
            content: "✕ ";
            color: rgba(31, 27, 24, 0.45);
            font-weight: 900;
        }

        /* 4. ROADMAP SECTION: Kinetic Horizon Track (Assess → Develop → Match → Paid Internship) */
        .roadmap-horizon-chamber {
            position: relative;
            min-height: 100vh;
            overflow: hidden;
            background: var(--than);
            color: var(--nga-card);
        }

        .roadmap-horizon-track {
            display: flex;
            min-height: 100vh;
            width: fit-content;
            align-items: center;
            padding: 0 6rem;
            gap: 3.5rem;
            will-change: transform;
        }

        .horizon-station-card {
            width: 440px;
            background: #25201C;
            border: 1px solid rgba(244, 239, 230, 0.22);
            padding: 3.5rem 3rem;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 480px;
            box-shadow: 0 25px 60px rgba(20, 17, 15, 0.5);
            transition: transform 0.3s ease, border-color 0.3s ease;
        }
        .horizon-station-card:hover {
            transform: translateY(-8px);
            border-color: var(--son);
        }

        .horizon-station-num {
            font-family: var(--font-heading);
            font-size: 4rem;
            color: var(--son);
            line-height: 1;
            margin-bottom: 1.25rem;
        }
        .horizon-phase-title {
            font-size: 0.74rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            color: var(--son);
            margin-bottom: 0.5rem;
        }
        .horizon-station-card h3 {
            font-size: 1.85rem;
            color: var(--nga-card);
            margin-bottom: 1rem;
        }
        .horizon-station-card p {
            font-size: 1.02rem;
            line-height: 1.75;
            color: rgba(244, 239, 230, 0.72);
        }
        .horizon-action-link {
            display: inline-block;
            margin-top: 1.5rem;
            color: var(--son);
            text-decoration: underline;
            font-size: 0.82rem;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            font-weight: 800;
        }

        /* 5. REGISTRATION SECTION: Spatial Form Ledger */
        .registration-spatial-stage {
            padding: 8rem 8.5vw;
            background: var(--nga);
            display: flex;
            justify-content: center;
        }

        .spatial-form-ledger {
            max-width: 920px;
            width: 100%;
            background: var(--nga-card);
            border: 2px solid var(--than);
            padding: 5rem 4.5rem;
            box-shadow: 0 30px 80px rgba(31, 27, 24, 0.12);
            position: relative;
        }

        .form-header-cluster {
            margin-bottom: 3.5rem;
            border-bottom: 1px solid var(--border-line);
            padding-bottom: 2rem;
        }
        .form-header-cluster h2 {
            font-size: 2.8rem;
            margin-top: 0.5rem;
        }

        .form-row-duo {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2.5rem;
        }
        .form-input-cell {
            margin-bottom: 2.25rem;
        }
        .form-input-cell label {
            display: block;
            font-size: 0.76rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            color: var(--than);
            margin-bottom: 0.75rem;
        }

        .spatial-field {
            width: 100%;
            background: transparent;
            border: none;
            border-bottom: 2px solid var(--border-line);
            padding: 0.85rem 0;
            font-family: var(--font-body);
            font-size: 1.05rem;
            color: var(--than);
            outline: none;
            transition: all 0.3s ease;
            border-radius: 0;
        }
        .spatial-field:focus {
            border-bottom-color: var(--son);
            background: rgba(191, 32, 26, 0.02);
            padding-left: 0.5rem;
        }

        /* Radio Year Options Grid (Image 2 Spec) */
        .radio-options-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
        }
        .radio-cell-pill {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.6rem;
            padding: 0.85rem 0.5rem;
            border: 1px solid var(--border-line);
            background: var(--nga-warm);
            font-size: 0.88rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.25s;
            text-align: center;
        }
        .radio-cell-pill:hover {
            border-color: var(--son);
        }
        .radio-cell-pill input[type="radio"] {
            accent-color: var(--son);
            width: 16px;
            height: 16px;
        }
        .radio-cell-pill:has(input:checked) {
            border-color: var(--son);
            background: rgba(191, 32, 26, 0.05);
            color: var(--than);
        }
        @media (max-width: 600px) {
            .radio-options-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        .checkbox-options-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.25rem;
        }
        .checkbox-cell-pill {
            display: flex;
            align-items: center;
            gap: 0.85rem;
            padding: 0.85rem 1.2rem;
            border: 1px solid var(--border-line);
            background: var(--nga-warm);
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s;
        }
        .checkbox-cell-pill:hover {
            border-color: var(--son);
        }
        .checkbox-cell-pill input[type="checkbox"] {
            accent-color: var(--son);
            width: 18px;
            height: 18px;
        }

        /* Dossier Stamp Block on Form */
        .form-dossier-stamp-wrap {
            margin-top: 1.5rem;
            margin-bottom: 1.5rem;
            padding: 1.5rem;
            border: 1px dashed var(--border-line);
            background: rgba(31, 27, 24, 0.02);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .stamp-target-box {
            width: 110px;
            height: 70px;
            border: 2px dashed rgba(191, 32, 26, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            font-size: 0.62rem;
            letter-spacing: 0.14em;
            text-transform: uppercase;
            color: rgba(191, 32, 26, 0.6);
            font-weight: 800;
            transition: all 0.3s;
        }

        .btn-submit-flagship {
            width: 100%;
            padding: 1.5rem;
            background: var(--than);
            color: var(--nga-card);
            border: 2px solid var(--than);
            font-family: var(--font-body);
            font-size: 0.88rem;
            letter-spacing: 0.22em;
            text-transform: uppercase;
            font-weight: 800;
            cursor: pointer;
            box-shadow: 0 10px 30px rgba(31, 27, 24, 0.2);
            transition: all 0.3s;
        }
        .btn-submit-flagship:hover {
            background: var(--son);
            border-color: var(--son);
            box-shadow: 0 12px 36px var(--son-glow);
            transform: translateY(-2px);
        }

        /* Spatial Footer */
        footer.spatial-footer {
            background: var(--than-dark);
            color: var(--nga-card);
            padding: 5rem 8.5vw 3rem 8.5vw;
            border-top: 2px solid var(--than);
        }
        .spatial-footer-grid {
            max-width: 1280px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 4rem;
            margin-bottom: 4rem;
        }
        .spatial-footer-brand h3 {
            color: var(--nga-card);
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }
        .spatial-footer-brand p {
            color: rgba(244, 239, 230, 0.7);
            font-size: 0.95rem;
            line-height: 1.8;
            max-width: 440px;
        }
        .spatial-footer-col h4 {
            color: var(--nga-card);
            font-size: 0.88rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.5rem;
        }
        .spatial-footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0; width: 24px; height: 2px;
            background: var(--son);
        }
        .spatial-footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.85rem;
        }
        .spatial-footer-links a {
            color: rgba(244, 239, 230, 0.65);
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .spatial-footer-links a:hover {
            color: var(--son);
        }
        .spatial-bottom-bar {
            max-width: 1280px;
            margin: 0 auto;
            border-top: 1px solid rgba(244, 239, 230, 0.15);
            padding-top: 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.76rem;
            color: rgba(244, 239, 230, 0.5);
            letter-spacing: 0.1em;
            flex-wrap: wrap;
            gap: 1rem;
        }

        /* MODAL POPUP */
        .spatial-modal-overlay {
            position: fixed;
            inset: 0;
            background: rgba(20, 17, 15, 0.92);
            backdrop-filter: blur(12px);
            z-index: 9999;
            display: none;
            align-items: center;
            justify-content: center;
            padding: 2rem;
            opacity: 0;
        }
        .spatial-modal-box {
            background: var(--nga-card);
            border: 2px solid var(--son);
            padding: 4.5rem 4rem;
            max-width: 640px;
            width: 100%;
            text-align: center;
            box-shadow: 0 35px 90px rgba(20, 17, 15, 0.6);
            position: relative;
        }
        .spatial-modal-box h2 {
            font-size: 2.5rem;
            color: var(--son);
            margin-bottom: 0.5rem;
        }
        .modal-user-greeting {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--than);
            margin-bottom: 1rem;
        }
        .modal-code-badge {
            display: inline-block;
            background: var(--than);
            color: var(--nga-card);
            font-size: 0.84rem;
            letter-spacing: 0.22em;
            text-transform: uppercase;
            font-weight: 800;
            padding: 0.5rem 1.6rem;
        }
        .btn-spatial-copy {
            background: var(--nga-warm);
            border: 1px solid var(--than);
            color: var(--than);
            font-family: var(--font-body);
            font-size: 0.72rem;
            letter-spacing: 0.16em;
            text-transform: uppercase;
            font-weight: 800;
            padding: 0.45rem 1rem;
            cursor: pointer;
            transition: all 0.2s;
            vertical-align: middle;
        }
        .btn-spatial-copy:hover {
            background: var(--than);
            color: var(--nga-card);
        }
        .spatial-modal-box p {
            font-size: 1.05rem;
            color: rgba(31, 27, 24, 0.85);
            line-height: 1.75;
            margin-bottom: 2.25rem;
        }
        .btn-fb-join-official {
            display: block;
            background: var(--son);
            color: var(--nga-card);
            padding: 1.35rem;
            text-decoration: none;
            font-size: 0.86rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            font-weight: 800;
            margin-bottom: 1.2rem;
            box-shadow: 0 8px 24px var(--son-glow);
            transition: all 0.3s;
        }
        .btn-fb-join-official:hover {
            background: var(--than);
        }
        .btn-modal-dismiss-flagship {
            background: transparent;
            border: none;
            font-family: var(--font-body);
            font-size: 0.78rem;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            color: rgba(31, 27, 24, 0.6);
            cursor: pointer;
            font-weight: 800;
        }
        .btn-modal-dismiss-flagship:hover {
            color: var(--than);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            header { padding: 0 1.5rem; }
            .nav-links-menu { display: none; }
            .hero-spatial-stage { padding: 8rem 1.5rem 4rem 3.5rem; }
            .hero-portal-grid { grid-template-columns: 1fr; gap: 3rem; }
            .values-spatial-section { padding: 6rem 1.5rem 6rem 3.5rem; }
            .s-col-7, .s-col-5, .s-col-4 { grid-column: span 12; }
            .spatial-partners-dock { flex-direction: column; text-align: center; gap: 2rem; }
            .spatial-partners-logos { flex-wrap: wrap; justify-content: center; }
            .persona-spatial-stage { padding: 6rem 1.5rem 6rem 3.5rem; }
            .flip-cards-container { grid-template-columns: 1fr; }
            .form-row-duo { grid-template-columns: 1fr; }
            .checkbox-options-grid { grid-template-columns: 1fr; }
            .spatial-form-ledger { padding: 2.5rem 1.5rem; }
            .spatial-spine-thread, .spatial-spine-nodes { left: 1rem; }
            footer.spatial-footer { padding: 4rem 1.5rem 2rem 3.5rem; }
            .spatial-footer-grid { grid-template-columns: 1fr; gap: 2.5rem; }

            /* Roadmap unpin on mobile/tablet */
            .roadmap-horizon-chamber {
                height: auto !important;
                min-height: auto !important;
                overflow: visible !important;
                padding: 6rem 1.5rem 6rem 3.5rem !important;
            }
            .roadmap-horizon-track {
                flex-direction: column !important;
                height: auto !important;
                min-height: auto !important;
                width: 100% !important;
                padding: 0 !important;
                gap: 2rem !important;
                transform: none !important;
            }
            .horizon-station-card {
                width: 100% !important;
                min-height: auto !important;
                padding: 2.5rem !important;
            }
        }

        @media (max-width: 768px) {
            header { padding: 0 1rem; height: 68px; }
            .nav-links-menu { display: none; }
            .matrix-scroll-hint { display: inline-block !important; }
            .spatial-spine-thread, .spatial-spine-nodes { display: none; }
            .hero-spatial-stage { padding: 6.5rem 1.25rem 3.5rem 1.25rem; }
            .hero-title-spatial { font-size: 2.4rem; margin-bottom: 1.5rem; }
            .hero-card-viewport { height: 260px; }
            .values-spatial-section { padding: 4rem 1.25rem; }
            .sp-benchmark-strip {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .sp-bench-card {
                padding: 2.5rem 1.5rem;
                transform: none !important;
            }
            .persona-spatial-stage { padding: 4rem 1.25rem; }
            .roadmap-horizon-chamber {
                padding: 4rem 1.25rem !important;
            }
            .flip-card-3d {
                height: auto !important;
                min-height: auto !important;
                perspective: none !important;
                transform: none !important;
            }
            .flip-face {
                position: relative !important;
                inset: auto !important;
                height: auto !important;
                padding: 2.5rem 1.5rem !important;
                backface-visibility: visible !important;
                transform: none !important;
                display: none;
            }
            .flip-card-3d:not(.flipped) .front-traditional {
                display: flex !important;
            }
            .flip-card-3d.flipped .back-institutional {
                display: flex !important;
            }
            .registration-spatial-stage { padding: 4rem 1.25rem; }
            .spatial-form-ledger { padding: 2rem 1.25rem; }
            .spatial-modal-box { padding: 2.5rem 1.5rem; }
            footer.spatial-footer { padding: 4rem 1.25rem 2rem 1.25rem; }
        }

        @media (max-width: 540px) {
            header { padding: 0 0.85rem; height: 64px; }
            .header-brand { gap: 0.75rem; }
            .diamond-seal-frame { width: 34px; height: 34px; }
            .brand-name { font-size: 1.15rem; }
            .brand-meta-tag { font-size: 0.58rem; letter-spacing: 0.12em; }
            .btn-domain-badge { display: none !important; }
            .btn-header-flagship { padding: 0.55rem 0.95rem; font-size: 0.68rem; letter-spacing: 0.12em; }
        }

        /* Self-Drawing Cyber-Heritage Rules */
        .self-drawing-rule {
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, var(--son) 0%, var(--border-line) 40%, var(--border-line) 80%, var(--son) 100%);
            transform-origin: left center;
            transform: scaleX(0);
            transition: transform 1.2s var(--ease-out-expo);
            position: relative;
            z-index: 10;
        }
        .self-drawing-rule.drawn {
            transform: scaleX(1);
        }

        /* Cyber-Heritage Telemetry Benchmark Strip with 3D Stacking Depth (Poster Trụ Cột: 92.5%, 1.000+ DN, ≥85đ) */
        .sp-benchmark-strip {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.75rem;
            position: relative;
            z-index: 20;
            perspective: 1200px;
            transform-style: preserve-3d;
            margin-bottom: 2rem;
        }
        .sp-bench-card {
            padding: 3.5rem 2.75rem;
            border: 2px solid var(--than);
            border-radius: 4px;
            display: flex;
            flex-direction: column;
            gap: 0.85rem;
            position: relative;
            background: var(--nga-card);
            box-shadow: 0 16px 40px rgba(31, 27, 24, 0.08);
            transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease, border-color 0.3s ease, background 0.3s ease;
            transform-style: preserve-3d;
            cursor: pointer;
        }
        .sp-bench-card:nth-child(1) {
            transform: translateZ(0px);
        }
        .sp-bench-card:nth-child(2) {
            transform: translateZ(16px);
            box-shadow: 0 20px 48px rgba(31, 27, 24, 0.1);
        }
        .sp-bench-card:nth-child(3) {
            transform: translateZ(32px);
            box-shadow: 0 24px 56px rgba(31, 27, 24, 0.12);
        }
        .sp-bench-card:hover {
            background: var(--nga-card);
            transform: translateY(-10px) translateZ(48px) scale(1.02);
            box-shadow: 0 32px 75px rgba(31, 27, 24, 0.18), 0 0 0 1px var(--son);
            border-color: var(--son);
            z-index: 5;
        }
        .sp-bench-card::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0;
            height: 3px;
            background: var(--son);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .sp-bench-card:hover::before {
            transform: scaleX(1);
        }
        .sp-bench-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.68rem;
            font-weight: 800;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            color: var(--son);
        }
        .sp-bench-indicator {
            width: 6px;
            height: 6px;
            background: var(--son);
            transform: rotate(45deg);
            display: inline-block;
        }
        .sp-bench-value {
            font-family: var(--font-heading);
            font-size: clamp(2.6rem, 4vw, 4rem);
            font-weight: 400;
            line-height: 1;
            color: var(--than);
            letter-spacing: -0.03em;
        }
        .sp-bench-title {
            font-size: 0.95rem;
            font-weight: 800;
            color: var(--than);
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }
        .sp-bench-desc {
            font-size: 0.88rem;
            color: rgba(31, 27, 24, 0.75);
            line-height: 1.65;
        }
        @media (max-width: 900px) {
            .sp-benchmark-strip {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .sp-bench-card {
                padding: 2.5rem 1.75rem;
                transform: none !important;
            }
        }