:root {
            --bg-primary: #0a0e14;
            --bg-secondary: #111720;
            --bg-card: #161c26;
            --bg-card-alt: #1a2130;
            --bg-elevated: #1e2738;
            --border-subtle: #1e293b;
            --border-medium: #263348;
            --text-primary: #e8ecf2;
            --text-secondary: #b0b8c4;
            --text-tertiary: #7d8a9a;
            --green-bright: #25D366;
            --green-deep: #128C7E;
            --green-glow: rgba(37, 211, 102, 0.18);
            --green-glow-strong: rgba(37, 211, 102, 0.30);
            --accent-teal: #0d9488;
            --radius-sm: 12px;
            --radius-md: 20px;
            --radius-lg: 28px;
            --radius-xl: 36px;
            --transition-fast: 0.18s ease;
            --transition-smooth: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Helvetica, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-stack);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
        }

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== HEADER ========== */
        .header {
            background-color: rgba(10, 14, 20, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition-fast);
        }

        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            padding: 16px 0;
            gap: 14px;
        }

        .logo {
            font-size: 1.7rem;
            font-weight: 750;
            letter-spacing: -0.025em;
            background: linear-gradient(135deg, #25D366 0%, #34d87a 40%, #128C7E 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            flex-shrink: 0;
        }

        .logo-sub {
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-tertiary);
            letter-spacing: 0.04em;
            margin-left: 4px;
            vertical-align: super;
            background: none;
            -webkit-background-clip: unset;
            background-clip: unset;
            color: #7d8a9a;
        }

        .nav-links {
            display: flex;
            gap: 28px;
            align-items: center;
            list-style: none;
            flex-wrap: wrap;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
            font-size: 0.95rem;
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links .active {
            color: var(--green-bright);
        }
        .nav-links .active {
            font-weight: 650;
        }

        .btn-outline {
            border: 1px solid var(--green-bright);
            background: transparent;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 600;
            color: var(--green-bright);
            transition: all var(--transition-fast);
            text-decoration: none;
            cursor: pointer;
            font-size: 0.9rem;
            white-space: nowrap;
        }
        .btn-outline:hover {
            background: rgba(37, 211, 102, 0.08);
            border-color: #34d87a;
            color: #34d87a;
            box-shadow: 0 0 18px var(--green-glow);
        }

        /* ========== BUTTONS ========== */
        .btn-primary {
            display: inline-block;
            background: linear-gradient(135deg, #25D366 0%, #1db954 100%);
            color: #0a0e14;
            font-weight: 650;
            padding: 13px 34px;
            border-radius: 44px;
            text-decoration: none;
            transition: all var(--transition-smooth);
            border: none;
            font-size: 1rem;
            cursor: pointer;
            letter-spacing: 0.01em;
            box-shadow: 0 4px 20px rgba(37, 211, 102, 0.22);
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, #34d87a 0%, #25D366 100%);
            box-shadow: 0 8px 32px rgba(37, 211, 102, 0.35);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: var(--bg-elevated);
            border: 1px solid var(--border-medium);
            padding: 12px 28px;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            color: var(--text-primary);
            transition: all var(--transition-fast);
            cursor: pointer;
            font-size: 0.95rem;
        }
        .btn-secondary:hover {
            border-color: var(--green-bright);
            background: rgba(37, 211, 102, 0.06);
            box-shadow: 0 0 16px var(--green-glow);
        }

        .btn-ghost-sm {
            display: inline-block;
            padding: 7px 16px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 600;
            text-decoration: none;
            color: var(--green-bright);
            border: 1px solid transparent;
            transition: all var(--transition-fast);
            cursor: pointer;
        }
        .btn-ghost-sm:hover {
            border-color: var(--green-bright);
            background: rgba(37, 211, 102, 0.06);
        }

        /* ========== HERO ========== */
        .hero {
            padding: 72px 0 56px;
            background: radial-gradient(ellipse at 30% 20%, rgba(37, 211, 102, 0.04) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 60%, rgba(18, 140, 126, 0.05) 0%, transparent 55%),
                var(--bg-primary);
            position: relative;
            overflow: hidden;
        }
        .hero::after {
            content: '';
            position: absolute;
            top: -180px;
            right: -120px;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(37, 211, 102, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            position: relative;
            z-index: 1;
        }
        .hero-content {
            flex: 1;
            min-width: 280px;
        }
        .hero-badge {
            background: rgba(37, 211, 102, 0.10);
            display: inline-block;
            padding: 7px 16px;
            border-radius: 28px;
            font-size: 0.82rem;
            font-weight: 550;
            color: #34d87a;
            margin-bottom: 22px;
            letter-spacing: 0.02em;
            border: 1px solid rgba(37, 211, 102, 0.20);
        }
        .hero-content h1 {
            font-size: clamp(2rem, 4.5vw, 3.4rem);
            font-weight: 800;
            line-height: 1.18;
            letter-spacing: -0.025em;
            color: #f0f4f8;
            margin-bottom: 18px;
        }
        .hero-content h1 .gradient-text {
            background: linear-gradient(135deg, #25D366 0%, #34d87a 45%, #5eeea8 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero-content p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 540px;
            margin-bottom: 30px;
            line-height: 1.7;
        }
        .hero-visual {
            flex: 1;
            text-align: center;
            min-width: 260px;
            position: relative;
        }
        .hero-visual .visual-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 22px;
            border: 1px solid var(--border-medium);
            box-shadow: 0 0 40px rgba(37, 211, 102, 0.07);
            display: inline-block;
            text-align: center;
        }
        .visual-card .qr-placeholder {
            width: 140px;
            height: 140px;
            margin: 0 auto 14px;
            background: #1a2a1f;
            border-radius: 16px;
            border: 2px dashed var(--border-medium);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--green-bright);
            font-size: 3rem;
        }
        .visual-card .visual-label {
            color: var(--text-tertiary);
            font-size: 0.82rem;
            letter-spacing: 0.03em;
        }
        .hero-visual .float-badge {
            position: absolute;
            top: -8px;
            right: 10px;
            background: var(--bg-elevated);
            border-radius: 20px;
            padding: 8px 16px;
            font-size: 0.78rem;
            color: var(--green-bright);
            border: 1px solid rgba(37, 211, 102, 0.30);
            font-weight: 600;
            animation: floatBadge 3.5s ease-in-out infinite;
        }
        @keyframes floatBadge {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-10px);
            }
        }

        /* ========== STATS ROW ========== */
        .stats-row {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
            margin-top: 20px;
        }
        .stat-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 18px 22px;
            text-align: center;
            min-width: 90px;
            flex: 1;
            border: 1px solid var(--border-subtle);
            transition: var(--transition-fast);
        }
        .stat-item:hover {
            border-color: rgba(37, 211, 102, 0.35);
            box-shadow: 0 0 20px var(--green-glow);
        }
        .stat-num {
            font-size: 1.7rem;
            font-weight: 750;
            color: var(--green-bright);
            letter-spacing: -0.01em;
        }
        .stat-label {
            font-size: 0.78rem;
            color: var(--text-tertiary);
            margin-top: 4px;
        }

        /* ========== SECTION TITLES ========== */
        .section-title {
            text-align: center;
            font-size: clamp(1.5rem, 3vw, 2.2rem);
            font-weight: 750;
            margin-bottom: 14px;
            color: #f0f4f8;
            letter-spacing: -0.01em;
        }
        .section-desc {
            text-align: center;
            color: var(--text-secondary);
            max-width: 620px;
            margin: 0 auto 50px;
            font-size: 1.05rem;
            line-height: 1.7;
        }

        /* ========== CORE FEATURES 4 CARDS ========== */
        .features {
            padding: 70px 0 60px;
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 24px 28px;
            text-align: center;
            transition: all var(--transition-smooth);
            border: 1px solid var(--border-subtle);
            position: relative;
            overflow: hidden;
            text-decoration: none;
            color: inherit;
            display: block;
            cursor: pointer;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: var(--green-bright);
            border-radius: 0 0 6px 6px;
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }
        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 24px 48px -16px rgba(0, 0, 0, 0.5), 0 0 30px var(--green-glow);
            border-color: rgba(37, 211, 102, 0.40);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            font-size: 2.6rem;
            margin-bottom: 16px;
            display: block;
        }
        .feature-card h3 {
            font-size: 1.35rem;
            margin-bottom: 10px;
            font-weight: 700;
            color: #f0f4f8;
        }
        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.93rem;
            line-height: 1.65;
            margin-bottom: 14px;
        }
        .feature-card .card-link-text {
            font-weight: 600;
            color: var(--green-bright);
            font-size: 0.88rem;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition-fast);
        }
        .feature-card:hover .card-link-text {
            gap: 8px;
        }

        /* ========== HIGHLIGHT STRIP ========== */
        .highlight-strip {
            background: var(--bg-card-alt);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            margin: 0 0 60px;
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border-medium);
        }
        .highlight-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            color: #d0d8e2;
            font-size: 0.95rem;
        }
        .highlight-dot {
            width: 9px;
            height: 9px;
            border-radius: 50%;
            background: var(--green-bright);
            flex-shrink: 0;
            box-shadow: 0 0 10px var(--green-glow-strong);
        }

        /* ========== SCENARIOS MODULE ========== */
        .scenarios {
            padding: 0 0 70px;
        }
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
        }
        .scenario-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 20px 24px;
            text-align: center;
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
        }
        .scenario-card:hover {
            border-color: rgba(37, 211, 102, 0.40);
            box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.5), 0 0 22px var(--green-glow);
            transform: translateY(-4px);
        }
        .scenario-card .sc-icon {
            font-size: 2.4rem;
            margin-bottom: 12px;
            display: block;
        }
        .scenario-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #f0f4f8;
            margin-bottom: 6px;
        }
        .scenario-card p {
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.6;
        }

        /* ========== WHATSAPP WEB SEO SECTION ========== */
        .web-seo-section {
            padding: 0 0 70px;
            background: var(--bg-primary);
        }
        .web-seo-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        @media (max-width: 768px) {
            .web-seo-grid {
                grid-template-columns: 1fr;
            }
        }
        .web-seo-card {
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            padding: 36px 28px;
            border: 1px solid var(--border-subtle);
        }
        .web-seo-card h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: #f0f4f8;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .web-seo-card ol {
            list-style: none;
            counter-reset: wstep;
            padding: 0;
        }
        .web-seo-card ol li {
            counter-increment: wstep;
            padding: 12px 0 12px 40px;
            position: relative;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
            border-bottom: 1px solid var(--border-subtle);
        }
        .web-seo-card ol li:last-child {
            border-bottom: none;
        }
        .web-seo-card ol li::before {
            content: counter(wstep);
            position: absolute;
            left: 0;
            top: 10px;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(37, 211, 102, 0.15);
            color: var(--green-bright);
            font-weight: 700;
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            justify-content: center;
            line-height: 1;
        }
        .web-seo-card .mini-faq {
            margin-top: 16px;
        }
        .web-seo-card .mini-faq details {
            background: var(--bg-card-alt);
            border-radius: 12px;
            padding: 14px 18px;
            margin-bottom: 8px;
            border: 1px solid var(--border-subtle);
            cursor: pointer;
            transition: var(--transition-fast);
        }
        .web-seo-card .mini-faq details:hover {
            border-color: rgba(37, 211, 102, 0.35);
        }
        .web-seo-card .mini-faq summary {
            font-weight: 600;
            font-size: 0.93rem;
            color: #d0d8e2;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .web-seo-card .mini-faq summary::after {
            content: '+';
            font-size: 1.2rem;
            color: var(--green-bright);
            font-weight: 700;
        }
        .web-seo-card .mini-faq details[open] summary::after {
            content: '−';
            color: var(--green-deep);
        }
        .web-seo-card .mini-faq .faq-answer {
            margin-top: 10px;
            color: var(--text-tertiary);
            font-size: 0.88rem;
            line-height: 1.65;
            padding-top: 10px;
            border-top: 1px solid var(--border-subtle);
        }

        /* ========== DOWNLOAD HUB ========== */
        .download-hub {
            padding: 0 0 70px;
        }
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 28px;
        }
        .download-card {
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            padding: 32px 24px 28px;
            text-align: center;
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
            position: relative;
        }
        .download-card:hover {
            border-color: rgba(37, 211, 102, 0.45);
            box-shadow: 0 20px 40px -14px rgba(0, 0, 0, 0.5), 0 0 28px var(--green-glow);
            transform: translateY(-5px);
        }
        .download-card .os-icon {
            font-size: 2.8rem;
            margin-bottom: 10px;
            display: block;
        }
        .download-card h4 {
            font-size: 1.25rem;
            font-weight: 700;
            color: #f0f4f8;
            margin-bottom: 6px;
        }
        .download-card .os-subtitle {
            color: var(--text-tertiary);
            font-size: 0.85rem;
            margin-bottom: 14px;
        }
        .download-card .dl-links {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            margin-top: 12px;
        }
        .dl-link-pill {
            padding: 7px 15px;
            border-radius: 18px;
            font-size: 0.8rem;
            font-weight: 600;
            text-decoration: none;
            background: rgba(37, 211, 102, 0.08);
            color: var(--green-bright);
            border: 1px solid rgba(37, 211, 102, 0.25);
            transition: all var(--transition-fast);
        }
        .dl-link-pill:hover {
            background: rgba(37, 211, 102, 0.16);
            border-color: var(--green-bright);
            box-shadow: 0 0 12px var(--green-glow);
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(135deg, #111d18 0%, #0f1a15 40%, #0a1410 100%);
            border-radius: var(--radius-xl);
            margin: 0 0 70px;
            padding: 56px 40px;
            text-align: center;
            border: 1px solid rgba(37, 211, 102, 0.20);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 240px;
            height: 240px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(37, 211, 102, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 1.9rem;
            font-weight: 750;
            margin-bottom: 14px;
            color: #f0f4f8;
            position: relative;
            z-index: 1;
        }
        .cta-section p {
            color: var(--text-secondary);
            position: relative;
            z-index: 1;
            max-width: 500px;
            margin: 0 auto 24px;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        /* ========== TAG CLOUD ========== */
        .tag-cloud-wrap {
            padding: 0 0 60px;
            text-align: center;
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 8px;
        }
        .tag-cloud a {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            padding: 8px 18px;
            border-radius: 22px;
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 0.84rem;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .tag-cloud a:hover {
            background: rgba(37, 211, 102, 0.10);
            border-color: var(--green-bright);
            color: #34d87a;
            font-weight: 550;
            box-shadow: 0 0 12px var(--green-glow);
        }

        /* ========== FAQ SECTION ========== */
        .faq-section {
            padding: 0 0 70px;
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-list details {
            background: var(--bg-card);
            border-radius: 16px;
            padding: 18px 24px;
            margin-bottom: 10px;
            border: 1px solid var(--border-subtle);
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .faq-list details:hover {
            border-color: rgba(37, 211, 102, 0.35);
            background: var(--bg-card-alt);
        }
        .faq-list summary {
            font-weight: 650;
            font-size: 1rem;
            color: #d0d8e2;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-list summary::-webkit-details-marker {
            display: none;
        }
        .faq-list summary::after {
            content: '+';
            font-size: 1.3rem;
            color: var(--green-bright);
            font-weight: 700;
            transition: transform var(--transition-fast);
        }
        .faq-list details[open] summary::after {
            content: '−';
            color: var(--green-deep);
        }
        .faq-list .faq-answer {
            margin-top: 12px;
            color: var(--text-tertiary);
            line-height: 1.7;
            padding-top: 12px;
            border-top: 1px solid var(--border-subtle);
            font-size: 0.93rem;
        }

        /* ========== FOOTER ========== */
        .footer {
            border-top: 1px solid var(--border-subtle);
            padding: 44px 0 28px;
            background: var(--bg-secondary);
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 28px;
            margin-bottom: 32px;
        }
        .footer-col {
            min-width: 130px;
        }
        .footer-col h4 {
            font-weight: 650;
            margin-bottom: 16px;
            color: #d0d8e2;
            font-size: 0.95rem;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: 10px;
        }
        .footer-col a {
            text-decoration: none;
            color: var(--text-tertiary);
            font-size: 0.84rem;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--green-bright);
        }
        .copyright {
            text-align: center;
            padding-top: 24px;
            border-top: 1px solid var(--border-subtle);
            font-size: 0.78rem;
            color: #5a6677;
            letter-spacing: 0.02em;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 768px) {
            .nav {
                flex-direction: column;
                gap: 12px;
                align-items: flex-start;
            }
            .nav-links {
                flex-wrap: wrap;
                gap: 16px;
            }
            .hero-grid {
                flex-direction: column;
                gap: 32px;
            }
            .hero-content h1 {
                font-size: 1.9rem;
            }
            .cta-section {
                padding: 36px 20px;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .stats-row {
                gap: 10px;
            }
            .stat-item {
                min-width: 65px;
                padding: 12px 14px;
            }
            .stat-num {
                font-size: 1.3rem;
            }
            .highlight-strip {
                padding: 24px 16px;
                gap: 14px;
            }
            .features-grid,
            .scenarios-grid,
            .download-grid {
                grid-template-columns: 1fr 1fr;
            }
            .web-seo-grid {
                grid-template-columns: 1fr;
            }
            .hero-visual .float-badge {
                right: -10px;
                top: -20px;
                font-size: 0.7rem;
                padding: 6px 10px;
            }
        }
        @media (max-width: 480px) {
            .features-grid,
            .scenarios-grid,
            .download-grid {
                grid-template-columns: 1fr;
            }
            .hero-content h1 {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            .nav-links {
                gap: 10px;
            }
            .nav-links a {
                font-size: 0.85rem;
            }
        }