/* ============================================================
           CSS VARIABLES
           ============================================================ */
        :root {
            --primary: var(--nv-accent);
            --primary-dark: var(--nv-accent-dark);
            --primary-light: var(--nv-accent-light);
            --primary-bg: var(--nv-accent-soft);
            --success: var(--nv-success);
            --warning: var(--nv-warning);
            --danger: var(--nv-danger);
            --dark: var(--nv-ink);
            --dark-secondary: var(--nv-ink-soft);
            --gray: var(--nv-body);
            --gray-light: var(--nv-line);
            --gray-bg: var(--nv-surface-2);
            --white: #FFFFFF;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.15);
            --radius: 16px;
            --radius-sm: 10px;
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', sans-serif;
            background: var(--white);
            color: var(--dark);
            min-height: 100vh;
        }

        /* ============================================================
           NAVIGATION
           ============================================================ */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 16px 40px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.06);
            transition: var(--transition);
        }

        .navbar.scrolled {
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            /* gap MUST stay 0: the wordmark is two spans (NIB|VOK) that read as ONE word.
               A flex `gap` here renders the brand as "NIB VOK". */
            gap: 0;
            font-size: 28px;
            font-weight: 900;
            color: var(--primary);
            text-decoration: none;
        }

        .nav-brand .ox {
            color: var(--dark);
        }

        .nav-brand .eightyeight {
            color: var(--primary);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-links a {
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            color: var(--gray);
            text-decoration: none;
            transition: var(--transition);
        }

        .nav-links a:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }

        .nav-links .btn-login {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
        }

        .nav-links .btn-login:hover {
            background: var(--primary);
            color: var(--white);
        }

        .nav-links .btn-signup {
            background: var(--primary);
            color: var(--white);
            font-weight: 600;
        }

        .nav-links .btn-signup:hover {
            background: var(--primary-dark);
            transform: scale(1.02);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--dark);
            cursor: pointer;
        }

        /* ============================================================
           HERO SECTION
           ============================================================ */
        .hero {
            padding: 120px 40px 80px;
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            min-height: 100vh;
        }

        .hero-content h1 {
            font-size: 52px;
            font-weight: 900;
            line-height: 1.1;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }

        .hero-content h1 .highlight {
            color: var(--primary);
            position: relative;
        }

        .hero-content h1 .highlight::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 0;
            right: 0;
            height: 8px;
            background: var(--primary-bg);
            z-index: -1;
            border-radius: 4px;
        }

        .hero-content p {
            font-size: 20px;
            color: var(--gray);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 500px;
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            padding: 16px 36px;
            background: var(--primary);
            color: var(--white);
            border: none;
            border-radius: var(--radius-sm);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: scale(1.02);
            box-shadow: 0 8px 30px rgb(var(--nv-accent-rgb) / 0.3);
        }

        .btn-secondary {
            padding: 16px 36px;
            background: transparent;
            color: var(--dark);
            border: 2px solid var(--gray-light);
            border-radius: var(--radius-sm);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }

        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-bg);
        }

        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 40px;
        }

        .hero-stats .stat .number {
            font-size: 32px;
            font-weight: 800;
            color: var(--dark);
        }

        .hero-stats .stat .label {
            font-size: 14px;
            color: var(--gray);
        }

        /* Hero Image */
        .hero-image {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            background: var(--dark-secondary);
            aspect-ratio: 4/3;
        }

        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .hero-image .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.4), transparent);
        }

        .hero-image .badge {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            color: var(--dark);
        }

        /* ============================================================
           PRODUCTS SECTION
           ============================================================ */
        .products-section {
            padding: 80px 40px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: 40px;
            font-weight: 800;
            margin-bottom: 12px;
        }

        .section-header p {
            font-size: 18px;
            color: var(--gray);
            max-width: 600px;
            margin: 0 auto;
        }

        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }

        .product-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--gray-light);
            transition: var(--transition);
            cursor: pointer;
            position: relative;
        }

        .product-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary);
        }

        .product-card .icon {
            font-size: 40px;
            margin-bottom: 16px;
            display: inline-block;
        }

        .product-card .badge {
            position: absolute;
            top: 16px;
            right: 16px;
            font-size: 11px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 12px;
        }

        .product-card .badge.free {
            background: var(--nv-success-soft);
            color: var(--nv-success-dark);
        }

        .product-card .badge.popular {
            background: var(--nv-warning-soft);
            color: var(--nv-warning-dark);
        }

        .product-card .badge.pro {
            background: var(--nv-info-soft);
            color: var(--nv-info-dark);
        }

        .product-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .product-card p {
            font-size: 14px;
            color: var(--gray);
            line-height: 1.6;
            margin-bottom: 16px;
        }

        .product-card .features {
            list-style: none;
            padding: 0;
            margin: 0 0 16px 0;
        }

        .product-card .features li {
            padding: 4px 0;
            font-size: 14px;
            color: var(--gray);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .product-card .features li i {
            color: var(--success);
            font-size: 14px;
            width: 18px;
        }

        .product-card .price {
            font-size: 28px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 4px;
        }

        .product-card .price span {
            font-size: 16px;
            font-weight: 400;
            color: var(--gray);
        }

        .product-card .tokens {
            font-size: 14px;
            color: var(--gray);
            margin-bottom: 16px;
        }

        .product-card .btn-product {
            width: 100%;
            padding: 12px;
            border-radius: var(--radius-sm);
            border: none;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            background: var(--primary);
            color: var(--white);
        }

        .product-card .btn-product:hover {
            background: var(--primary-dark);
            transform: scale(1.02);
        }

        .product-card .btn-product.outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .product-card .btn-product.outline:hover {
            background: var(--primary);
            color: var(--white);
        }

        .product-card .btn-product.free {
            background: var(--gray-light);
            color: var(--gray);
            cursor: default;
        }

        /* ============================================================
           PRODUCT MODAL
           ============================================================ */
        .modal {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
            z-index: 2000;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .modal.active {
            display: flex;
        }

        .modal-content {
            background: var(--white);
            border-radius: var(--radius);
            padding: 40px;
            max-width: 600px;
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            position: relative;
            animation: modalSlide 0.3s ease;
        }

        @keyframes modalSlide {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .modal-close {
            position: absolute;
            top: 16px;
            right: 20px;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--gray);
            cursor: pointer;
            transition: var(--transition);
        }

        .modal-close:hover {
            color: var(--dark);
        }

        .modal-content .icon {
            font-size: 48px;
            margin-bottom: 16px;
        }

        .modal-content h2 {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 8px;
        }

        .modal-content .subtitle {
            font-size: 16px;
            color: var(--gray);
            margin-bottom: 20px;
        }

        .modal-content .features-list {
            list-style: none;
            padding: 0;
            margin: 0 0 24px 0;
        }

        .modal-content .features-list li {
            padding: 8px 0;
            font-size: 15px;
            color: var(--dark-secondary);
            display: flex;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid var(--gray-light);
        }

        .modal-content .features-list li i {
            color: var(--success);
            font-size: 16px;
            width: 20px;
        }

        .modal-content .price-large {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .modal-content .price-large span {
            font-size: 18px;
            font-weight: 400;
            color: var(--gray);
        }

        .modal-content .tokens-info {
            font-size: 14px;
            color: var(--gray);
            margin-bottom: 20px;
        }

        .modal-content .btn-purchase {
            width: 100%;
            padding: 16px;
            border-radius: var(--radius-sm);
            border: none;
            font-size: 18px;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            background: var(--primary);
            color: var(--white);
        }

        .modal-content .btn-purchase:hover {
            background: var(--primary-dark);
            transform: scale(1.02);
        }

        .modal-content .btn-purchase i {
            margin-right: 8px;
        }

        .modal-content .note {
            font-size: 13px;
            color: var(--gray);
            text-align: center;
            margin-top: 12px;
        }

        /* ============================================================
           TESTIMONIALS
           ============================================================ */
        .testimonials {
            padding: 60px 40px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }

        .testimonial-card {
            background: var(--gray-bg);
            border-radius: var(--radius);
            padding: 24px;
            border: 1px solid var(--gray-light);
        }

        .testimonial-card .stars {
            color: var(--nv-gold);
            font-size: 16px;
            margin-bottom: 8px;
        }

        .testimonial-card blockquote {
            font-size: 15px;
            line-height: 1.7;
            color: var(--dark-secondary);
            font-style: italic;
            margin-bottom: 12px;
        }

        .testimonial-card .author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .testimonial-card .author .avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
            font-size: 18px;
        }

        .testimonial-card .author .name {
            font-weight: 600;
            font-size: 15px;
        }

        .testimonial-card .author .role {
            font-size: 13px;
            color: var(--gray);
        }

        /* ============================================================
           FOOTER
           ============================================================ */
        .footer {
            background: var(--dark);
            color: var(--white);
            padding: 60px 40px 30px;
        }

        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }

        .footer-brand .logo {
            font-size: 24px;
            font-weight: 900;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .footer-brand .logo .ox {
            color: var(--white);
        }

        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            line-height: 1.7;
            max-width: 300px;
        }

        .footer h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--white);
        }

        .footer a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            font-size: 14px;
            padding: 4px 0;
            transition: var(--transition);
        }

        .footer a:hover {
            color: var(--white);
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 40px auto 0;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-social {
            display: flex;
            gap: 12px;
        }

        .footer-social a {
            display: inline-block;
            color: rgba(255, 255, 255, 0.4);
            font-size: 18px;
        }

        .footer-social a:hover {
            color: var(--white);
        }

        /* ============================================================
           RESPONSIVE
           ============================================================ */
        @media (max-width: 1024px) {
            .hero {
                grid-template-columns: 1fr;
                text-align: center;
                padding: 100px 20px 60px;
            }

            .hero-content p {
                margin: 0 auto 32px;
            }

            .hero-buttons {
                justify-content: center;
            }

            .hero-stats {
                justify-content: center;
            }

            .hero-image {
                max-width: 600px;
                margin: 0 auto;
            }
        }

        @media (max-width: 768px) {
            .navbar {
                padding: 12px 20px;
            }

            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--white);
                padding: 20px;
                flex-direction: column;
                border-bottom: 1px solid var(--gray-light);
                box-shadow: var(--shadow);
            }

            .nav-links.open {
                display: flex;
            }

            .mobile-toggle {
                display: block;
            }

            .hero-content h1 {
                font-size: 32px;
            }

            .hero-content p {
                font-size: 17px;
            }

            .hero-stats {
                flex-wrap: wrap;
                gap: 20px;
            }

            .products-section {
                padding: 40px 20px;
            }

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

            .section-header h2 {
                font-size: 28px;
            }

            .testimonials {
                padding: 40px 20px;
            }

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

            .footer-container {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }

            .modal-content {
                padding: 24px;
            }

            .modal-content .price-large {
                font-size: 28px;
            }
        }

        @media (max-width: 480px) {
            .products-grid {
                grid-template-columns: 1fr;
            }

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

            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
            }

            .hero-buttons {
                flex-direction: column;
            }
        }

        html.dark {
            --gray-bg: var(--nv-ink);
            --white: var(--nv-ink-soft);
            --dark: var(--nv-on-dark);
            --dark-secondary: var(--nv-line);
            --gray: var(--nv-on-dark-2);
            --gray-light: var(--nv-ink-line);
        }

        /* ============================================================
           HERO BOOK LINK + DEMO VIDEO MODAL
           ============================================================ */
        .hero-book-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-top: 14px;
            font-size: 14px;
            color: var(--gray);
            text-decoration: none;
            line-height: 1.4;
            transition: var(--transition);
        }

        .hero-book-link:hover { color: var(--primary); }
        .hero-book-link i { color: var(--primary); }
        .hero-book-link strong { color: var(--primary); font-weight: 700; }

        .modal-content-video {
            max-width: 820px;
            padding: 28px;
        }

        .demo-title {
            font-size: 20px;
            font-weight: 800;
            margin: 0 0 16px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--dark);
        }

        .demo-title i { color: var(--primary); }

        .modal-content-video video {
            width: 100%;
            max-height: 62vh;
            border-radius: var(--radius-sm);
            background: #000;
            display: block;
        }

        .demo-caption {
            font-size: 14px;
            color: var(--gray);
            margin: 16px 0 0;
            line-height: 1.5;
            text-align: center;
        }

        .demo-caption strong { color: var(--primary); }

        /* dark theme */
        html.dark .modal-content-video { background: var(--nv-ink-soft); }
        html.dark .demo-title { color: var(--nv-line-2); }