        :root {
            --accent: #6366f1;
            --accent-hover: #4f46e5;
            --accent-light: rgba(99, 102, 241, 0.1);
            --surface: #ffffff;
            --surface-secondary: #f8fafc;
            --border: #e2e8f0;
            --text-primary: #0f172a;
            --text-secondary: #64748b;
            --text-muted: #6b7280;
            --radius: 0.75rem;
            --radius-sm: 0.5rem;
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            color: var(--text-primary);
            background: var(--surface);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        /* ── Navbar ── */
        .landing-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            padding: 1rem 0;
            transition: background 0.3s, box-shadow 0.3s, padding 0.3s;
        }

        .landing-nav.scrolled {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
            padding: 0.6rem 0;
        }

        .landing-nav .nav-inner {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .landing-nav .nav-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            letter-spacing: -0.02em;
        }

        .landing-nav.scrolled .nav-brand { color: var(--text-primary); }
        .landing-nav .nav-brand i { color: var(--accent); font-size: 1.3rem; }

        .landing-nav .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
            list-style: none;
            margin: 0;
        }

        .landing-nav .nav-links a {
            font-size: 0.875rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color var(--transition);
        }

        .landing-nav .nav-links a:hover { color: #fff; }
        .landing-nav.scrolled .nav-links a { color: var(--text-secondary); }
        .landing-nav.scrolled .nav-links a:hover { color: var(--text-primary); }

        .landing-nav .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .btn-nav-signin {
            font-size: 0.875rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.85);
            text-decoration: none;
            padding: 0.45rem 1rem;
            transition: color var(--transition);
        }

        .btn-nav-signin:hover { color: #fff; }
        .landing-nav.scrolled .btn-nav-signin { color: var(--text-secondary); }
        .landing-nav.scrolled .btn-nav-signin:hover { color: var(--text-primary); }

        .btn-nav-cta {
            font-size: 0.875rem;
            font-weight: 500;
            color: #fff;
            background: var(--accent);
            border: none;
            border-radius: var(--radius-sm);
            padding: 0.5rem 1.15rem;
            text-decoration: none;
            transition: background var(--transition), box-shadow var(--transition);
        }

        .btn-nav-cta:hover {
            background: var(--accent-hover);
            color: #fff;
            box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
        }

        .landing-nav.scrolled .nav-toggle { color: var(--text-primary); }

        /* ── Hero ── */
        .hero {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
            padding: 10rem 1.5rem 6rem;
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: 50%;
            transform: translateX(-50%);
            width: 100%;
            height: 200%;
            background: radial-gradient(ellipse, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.3), transparent);
        }

        .hero-inner {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
        }

        .hero-inner h1 {
            font-size: 3.5rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.12;
            letter-spacing: -0.03em;
            margin-bottom: 1.25rem;
        }

        .hero-inner h1 span {
            background: linear-gradient(135deg, #818cf8, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-inner .hero-sub {
            font-size: 1.15rem;
            color: #94a3b8;
            line-height: 1.7;
            margin-bottom: 2.5rem;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-actions {
            display: flex;
            gap: 0.75rem;
            align-items: center;
            justify-content: center;
        }

        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            background: var(--accent);
            border: none;
            border-radius: var(--radius-sm);
            padding: 0.75rem 1.5rem;
            text-decoration: none;
            transition: all var(--transition);
        }

        .btn-hero-primary:hover {
            background: var(--accent-hover);
            color: #fff;
            box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
            transform: translateY(-1px);
        }

        .btn-hero-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: #cbd5e1;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-sm);
            padding: 0.75rem 1.5rem;
            text-decoration: none;
            transition: all var(--transition);
        }

        .btn-hero-outline:hover {
            color: #fff;
            border-color: rgba(255, 255, 255, 0.3);
            background: rgba(255, 255, 255, 0.05);
        }

        /* ── AI Logos strip ── */
        .ai-strip {
            margin-top: 3.5rem;
            color: rgba(255, 255, 255, 0.3);
            font-size: 0.78rem;
            font-weight: 500;
            letter-spacing: 0.05em;
            text-transform: uppercase;
        }

        .ai-strip .ai-names {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 2rem;
            margin-top: 0.75rem;
            flex-wrap: wrap;
        }

        .ai-strip .ai-names span {
            font-size: 0.95rem;
            font-weight: 600;
            color: rgba(255, 255, 255, 0.45);
            letter-spacing: 0.02em;
            text-transform: none;
        }

        /* ── Sections ── */
        section { padding: 5rem 1.5rem; }
        .section-inner { max-width: 1140px; margin: 0 auto; }

        .section-label {
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--accent);
            margin-bottom: 0.5rem;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 0.75rem;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 560px;
        }

        /* ── How It Works ── */
        .how-it-works { background: var(--surface-secondary); }

        .steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 3rem;
            position: relative;
        }

        .steps::before {
            content: '';
            position: absolute;
            top: 32px;
            left: calc(16.66% + 1rem);
            right: calc(16.66% + 1rem);
            height: 2px;
            background: linear-gradient(90deg, var(--accent), var(--border), var(--accent));
            opacity: 0.4;
        }

        .step {
            text-align: center;
            position: relative;
        }

        .step-number {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--accent-light);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0 auto 1.25rem;
            position: relative;
            z-index: 1;
            border: 3px solid var(--surface-secondary);
            box-shadow: var(--shadow);
        }

        .step h3 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .step p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.6;
            max-width: 280px;
            margin: 0 auto;
        }

        /* ── Audience Sections ── */
        .audience-section { background: var(--surface); }
        .audience-section.alt { background: var(--surface-secondary); }

        .audience-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
            margin-top: 2.5rem;
        }

        .audience-grid > * { min-width: 0; }
        .audience-grid.reverse .audience-visual { order: -1; }

        .audience-text h3 {
            font-size: 1.5rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 0.75rem;
        }

        .audience-text p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 1.25rem;
        }

        .audience-list {
            list-style: none;
            padding: 0;
            margin: 0 0 1.5rem;
        }

        .audience-list li {
            display: flex;
            align-items: flex-start;
            gap: 0.6rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
            margin-bottom: 0.6rem;
        }

        .audience-list li i {
            color: var(--accent);
            margin-top: 0.2rem;
            flex-shrink: 0;
        }

        .audience-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--accent);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            transition: gap var(--transition);
        }

        .audience-link:hover { gap: 0.6rem; color: var(--accent-hover); }

        /* ── Visual Mockups ── */
        .mockup-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            overflow: hidden;
        }

        .mockup-bar {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1rem;
            background: var(--surface-secondary);
            border-bottom: 1px solid var(--border);
        }

        .mockup-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
        }

        .mockup-dot.red { background: #ff5f57; }
        .mockup-dot.yellow { background: #febc2e; }
        .mockup-dot.green { background: #28c840; }

        .mockup-bar-title {
            flex: 1;
            text-align: center;
            font-size: 0.72rem;
            color: var(--text-muted);
        }

        .mockup-body {
            padding: 1.5rem;
        }

        /* Chat mockup */
        .chat-mockup .chat-msg {
            margin-bottom: 1rem;
            display: flex;
            gap: 0.6rem;
            align-items: flex-start;
        }

        .chat-mockup .chat-avatar {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            flex-shrink: 0;
            font-weight: 600;
        }

        .chat-mockup .chat-avatar.user { background: var(--accent-light); color: var(--accent); }
        .chat-mockup .chat-avatar.ai { background: #dcfce7; color: #166534; }

        .chat-mockup .chat-bubble {
            background: var(--surface-secondary);
            border: 1px solid var(--border);
            border-radius: 0.6rem;
            padding: 0.6rem 0.85rem;
            font-size: 0.82rem;
            color: var(--text-primary);
            line-height: 1.5;
            max-width: 85%;
        }

        .chat-mockup .chat-bubble.ai-bubble {
            background: rgba(99, 102, 241, 0.05);
            border-color: rgba(99, 102, 241, 0.15);
        }

        .chat-mockup .chat-source {
            font-size: 0.7rem;
            color: var(--text-muted);
            margin-top: 0.3rem;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }

        .chat-mockup .chat-source i { font-size: 0.65rem; }

        /* Code mockup */
        .code-mockup {
            background: #0f172a;
            border-radius: var(--radius);
            border: 1px solid rgba(255, 255, 255, 0.08);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }

        .code-mockup .code-bar {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1rem;
            background: rgba(255, 255, 255, 0.03);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .code-mockup .code-bar-title {
            flex: 1;
            text-align: center;
            font-size: 0.72rem;
            color: rgba(255, 255, 255, 0.3);
        }

        .code-mockup pre {
            padding: 1.25rem;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.78rem;
            line-height: 1.7;
            color: #c9d1d9;
            overflow-x: auto;
            margin: 0;
        }

        .code-mockup .key { color: #818cf8; }
        .code-mockup .string { color: #34d399; }
        .code-mockup .comment { color: #475569; }
        .code-mockup .keyword { color: #f472b6; }
        .code-mockup .func { color: #fbbf24; }
        .code-mockup .brace { color: #94a3b8; }
        .code-mockup .number { color: #f472b6; }

        /* ── Features grid ── */
        .features { background: var(--surface-secondary); }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.25rem;
            margin-top: 3rem;
        }

        .feature-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 1.75rem;
            transition: all var(--transition);
        }

        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: rgba(99, 102, 241, 0.2);
        }

        .feature-icon {
            width: 44px;
            height: 44px;
            border-radius: 0.6rem;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            margin-bottom: 1rem;
        }

        .feature-card h3 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .feature-card p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        /* ── CTA Section ── */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -30%;
            left: 50%;
            transform: translateX(-50%);
            width: 100%;
            height: 160%;
            background: radial-gradient(ellipse, rgba(99, 102, 241, 0.1) 0%, transparent 60%);
            pointer-events: none;
        }

        .cta-section h2 {
            font-size: 2.25rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.02em;
            margin-bottom: 1rem;
            position: relative;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: #94a3b8;
            margin-bottom: 2rem;
            position: relative;
        }

        .cta-section .hero-actions { position: relative; }

        /* ── Footer ── */
        .landing-footer {
            background: #0f172a;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 3rem 1.5rem;
        }

        .footer-inner {
            max-width: 1140px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: start;
        }

        .footer-brand {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 0.5rem;
        }

        .footer-brand i { color: var(--accent); }

        .footer-tagline {
            font-size: 0.82rem;
            color: #64748b;
            max-width: 250px;
            line-height: 1.5;
        }

        .footer-links {
            display: flex;
            gap: 3rem;
        }

        .footer-col h4 {
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #94a3b8;
            margin-bottom: 0.75rem;
        }

        .footer-col a {
            display: block;
            font-size: 0.85rem;
            color: #64748b;
            text-decoration: none;
            padding: 0.2rem 0;
            transition: color var(--transition);
        }

        .footer-col a:hover { color: #fff; }

        .footer-bottom {
            max-width: 1140px;
            margin: 2rem auto 0;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.78rem;
            color: #475569;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .footer-bottom .lang-switcher-toggle {
            color: #475569;
        }
        .footer-bottom .lang-switcher-toggle:hover {
            color: #94a3b8;
        }

        /* ── Animations ── */
        .reveal {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .reveal-delay-1 { transition-delay: 0.1s; }
        .reveal-delay-2 { transition-delay: 0.2s; }
        .reveal-delay-3 { transition-delay: 0.3s; }
        .reveal-delay-4 { transition-delay: 0.4s; }
        .reveal-delay-5 { transition-delay: 0.5s; }

        /* ── Responsive ── */
        @media (max-width: 992px) {
            .hero-inner h1 { font-size: 2.75rem; }
            .audience-grid { grid-template-columns: 1fr; gap: 2.5rem; }
            .audience-grid.reverse .audience-visual { order: 0; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }

            /* Collapse nav at this breakpoint (not 768px) to prevent wrapping */
            .nav-toggle { display: block; }
            .landing-nav .nav-center,
            .landing-nav .nav-actions { display: none; }
            .landing-nav .nav-center.open,
            .landing-nav .nav-actions.open { display: flex; }

            .landing-nav .nav-inner { flex-wrap: wrap; }

            .landing-nav .nav-center.open {
                flex-direction: column;
                width: 100%;
                order: 3;
                padding: 1rem 0 0.5rem;
                gap: 0.5rem;
            }

            .landing-nav .nav-actions.open {
                width: 100%;
                order: 4;
                padding-bottom: 0.5rem;
            }

            /* Solid background when menu is open so it doesn't overlap content */
            .landing-nav.nav-open {
                background: #0f172a;
                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
            }
            .landing-nav.scrolled.nav-open {
                background: rgba(255, 255, 255, 0.98);
            }

            /* Code block: constrain to viewport */
            .code-mockup { max-width: 100%; }
            .code-mockup pre { font-size: 0.7rem; }
        }

        @media (max-width: 768px) {
            .hero { padding: 8rem 1.5rem 4rem; }
            .hero-inner h1 { font-size: 2.1rem; }
            .hero-actions { flex-direction: column; }
            .features-grid { grid-template-columns: 1fr; }
            .steps { grid-template-columns: 1fr; gap: 2.5rem; }
            .steps::before { display: none; }
            .section-title { font-size: 1.6rem; }
            .audience-text h3 { font-size: 1.25rem; }
            .cta-section h2 { font-size: 1.75rem; }
            .cta-section .hero-actions { flex-direction: column; }
            .footer-inner { flex-direction: column; gap: 2rem; }
            .footer-links { gap: 2rem; }
            .ai-strip .ai-names { gap: 1.25rem; }
            .ai-strip .ai-names span { font-size: 0.82rem; }
            .code-mockup pre { font-size: 0.65rem; }

            /* Audience sections: prevent text overflow */
            .audience-text { overflow-wrap: break-word; word-break: break-word; }
        }

        /* Messages overlay */
        .landing-messages { position: fixed; top: 0; left: 0; right: 0; z-index: 200; padding: 1rem 1.5rem; }
        .landing-messages .alert { max-width: 600px; margin: 0 auto 0.5rem; font-size: 0.875rem; border-radius: 0.5rem; box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
        .landing-messages .btn-close { font-size: 0.7rem; }

        /* Coming soon label */
        .coming-soon { opacity: 0.6; }

        /* Section centered */
        .section-centered { text-align: center; }
        .section-centered .section-title,
        .section-centered .section-subtitle { margin-left: auto; margin-right: auto; }

        /* Code spacer */
        .code-spacer { display: inline-block; width: 30px; }

        /* Feature icon color variants */
        .feature-icon--indigo { background: rgba(99, 102, 241, 0.1); color: #6366f1; }
        .feature-icon--green { background: rgba(22, 163, 74, 0.1); color: #16a34a; }
        .feature-icon--blue { background: rgba(37, 99, 235, 0.1); color: #2563eb; }
        .feature-icon--purple { background: rgba(168, 85, 247, 0.1); color: #a855f7; }
        .feature-icon--amber { background: rgba(217, 119, 6, 0.1); color: #d97706; }
        .feature-icon--rose { background: rgba(244, 63, 94, 0.1); color: #f43f5e; }
