:root {
            --primary: #2E7BFF;
            --primary-dark: #1A56CC;
            --secondary: #00C2FF;
            --accent: #FF5722;
            --dark: #1E293B;
            --light: #F8FAFC;
            --gray: #64748B;
            --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            --gradient-dark: linear-gradient(135deg, var(--dark) 0%, #334155 100%);
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow: 0 4px 6px rgba(0,0,0,0.05), 0 10px 15px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 20px 48px rgba(0,0,0,0.1);
            --radius: 8px;
            --radius-lg: 16px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            color: var(--dark);
            line-height: 1.6;
            background-color: var(--light);
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .section {
            padding: 80px 0;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            text-align: center;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--gray);
            text-align: center;
            max-width: 700px;
            margin: 0 auto 3rem;
        }

        /* Button Style */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            outline: none;
        }

        .btn-primary {
            background: var(--gradient-primary);
            color: white;
            box-shadow: 0 4px 14px rgba(46, 123, 255, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(46, 123, 255, 0.5);
        }

        .btn-secondary {
            background: white;
            color: var(--primary);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
        }

        .btn-secondary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
        }

        .btn-icon {
            margin-right: 8px;
            font-size: 1.1rem;
        }

        /* navigation bar */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .header.scrolled {
            box-shadow: var(--shadow);
        }

        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }

        .logo {
            display: flex;
            align-items: center;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--dark);
        }
        .logo-img {
            width: 40px;
            height: 40px;
            margin-right: 10px;
            border-radius: 10px; -
            object-fit: cover;   
            vertical-align: middle;
        }

        .nav-menu {
            display: flex;
            gap: 1.5rem;
        }

        .nav-link {
            font-weight: 500;
            position: relative;
            padding: 0.5rem 0;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-primary);
            transition: var(--transition);
        }

        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }

        .nav-buttons {
            display: flex;
            gap: 1rem;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.5rem;
            color: var(--dark);
        }

        /* Hero Section */
        .hero {
            padding: 160px 0 100px;
            background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.9)), 
                        url('../image/hero.webp');
            background-size: cover;
            background-position: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -100px;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: var(--gradient-primary);
            opacity: 0.1;
            z-index: -1;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -100px;
            left: -100px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: var(--gradient-primary);
            opacity: 0.1;
            z-index: -1;
        }

        .hero-content {
            display: flex;
            align-items: center;
            gap: 60px;
        }

        .hero-text {
            flex: 1;
        }

        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            background: var(--gradient-primary);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--gray);
            margin-bottom: 2rem;
        }

        .hero-buttons {
            display: flex;
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .hero-stats {
            display: flex;
            gap: 3rem;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
        }

        .stat-number {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--gray);
        }

        .hero-image {
            flex: 1;
            position: relative;
        }

        .device-mockup {
            position: relative;
            width: 520px;
            height: 310px;
            margin: 47px auto;
        }

        .device {
            position: absolute;
            width: 512px;
            height: auto;
            border-radius: 40px;
            box-shadow: var(--shadow-lg);
            padding: 12px;
            overflow: hidden;
        }

        .device-screen {
            width: 100%;
            height: 100%;
            border-radius: 30px;
            overflow: hidden;
            position: relative;
        }

        .device-screen img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .fill-img {
            width: 100%;
            height: 100%;
            object-fit: cover; 
            display: block;
        }

        .floating-icons {
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
        }

        .floating-icon {
            position: absolute;
            width: 60px;
            height: 60px;
            background: white;
            border-radius: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow);
            animation: float 6s infinite ease-in-out;
        }

        .floating-icon:nth-child(1) {
            top: 20%;
            left: -30px;
            animation-delay: 0s;
        }

        .floating-icon:nth-child(2) {
            top: 50%;
            right: -20px;
            animation-delay: 1s;
        }

        .floating-icon:nth-child(3) {
            bottom: 15%;
            left: -40px;
            animation-delay: 2s;
        }

        @keyframes float {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-20px);
            }
        }

        /* Features */
        .features {
            background-color: white;
            position: relative;
        }

        .features::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 100%;
            height: 100%;
            background-image: 
                radial-gradient(circle at 90% 10%, rgba(46, 123, 255, 0.1) 0%, transparent 300px),
                radial-gradient(circle at 10% 90%, rgba(0, 194, 255, 0.1) 0%, transparent 300px);
            z-index: 0;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            position: relative;
            z-index: 1;
        }

        .feature-card {
            background: white;
            border-radius: var(--radius-lg);
            padding: 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }

        .feature-icon {
            width: 60px;
            height: 60px;
            border-radius: 15px;
            background: var(--gradient-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: white;
            font-size: 1.5rem;
        }

        .feature-title {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .feature-desc {
            color: var(--gray);
            margin-bottom: 20px;
        }

        .feature-list {
            margin-top: 20px;
        }

        .feature-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 10px;
        }

        .feature-check {
            color: var(--primary);
            margin-right: 10px;
            margin-top: 4px;
        }

        /* Products */
        .products {
            background-color: var(--light);
        }

        .product-tabs {
            display: flex;
            justify-content: center;
            margin-bottom: 40px;
            flex-wrap: wrap;
            gap: 10px;
        }

        .product-tab {
            padding: 0.75rem 1.5rem;
            border-radius: 50px;
            font-weight: 500;
            cursor: pointer;
            background: white;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .product-tab.active {
            background: var(--gradient-primary);
            color: white;
            box-shadow: 0 4px 14px rgba(46, 123, 255, 0.4);
        }

        .product-content {
            display: none;
        }

        .product-content.active {
            display: block;
            animation: fadeIn 0.5s ease-in-out;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .product-card {
            background: white;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }

        .product-image {
            height: 563px;
            overflow: hidden;
        }

        .product-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .product-card:hover .product-image img {
            transform: scale(1.05);
        }

        .product-details {
            padding: 30px;
        }

        .product-name {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .product-rating {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
        }

        .rating-stars {
            color: #FFC107;
            margin-right: 10px;
        }

        .rating-count {
            color: var(--gray);
            font-size: 0.9rem;
        }

        .product-description {
            color: var(--gray);
            margin-bottom: 20px;
        }

        .product-features {
            margin-bottom: 20px;
        }

        .product-feature {
            display: flex;
            align-items: flex-start;
            margin-bottom: 8px;
        }

        .product-feature i {
            color: var(--primary);
            margin-right: 10px;
            margin-top: 4px;
        }

        .product-actions {
            display: flex;
            gap: 10px;
        }

        /* Statistical component */
        .stats {
            background: var(--gradient-dark);
            color: white;
        }

        .stats-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            text-align: center;
        }

        .stat-box {
            padding: 30px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: var(--radius);
            backdrop-filter: blur(10px);
        }

        .stat-box-number {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #fff, rgba(255, 255, 255, 0.7));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .stat-box-label {
            font-size: 1.1rem;
            opacity: 0.9;
        }

        /* Testimonials */
        .testimonials {
            background-color: white;
            position: relative;
            overflow: hidden;
        }

        .testimonials::before {
            content: '';
            position: absolute;
            top: -200px;
            right: -200px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: var(--gradient-primary);
            opacity: 0.05;
            z-index: 0;
        }

        .testimonials-slider {
            position: relative;
            z-index: 1;
        }

        .testimonial-card {
            background: white;
            border-radius: var(--radius-lg);
            padding: 30px;
            box-shadow: var(--shadow);
            margin: 20px;
            position: relative;
        }

        .testimonial-content {
            font-size: 1.1rem;
            margin-bottom: 20px;
            position: relative;
        }

        .testimonial-content::before {
            content: '"';
            font-size: 4rem;
            position: absolute;
            top: -30px;
            left: -10px;
            color: var(--primary);
            opacity: 0.2;
            font-family: Georgia, serif;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
        }

        .author-avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            margin-right: 15px;
            overflow: hidden;
        }

        .author-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .author-details {
            flex: 1;
        }

        .author-name {
            font-weight: 600;
            margin-bottom: 5px;
        }

        .author-title {
            color: var(--gray);
            font-size: 0.9rem;
        }

        .testimonial-rating {
            color: #FFC107;
            margin-top: 5px;
        }

        /* CTA */
        .cta {
            background: var(--gradient-primary);
            color: white;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta::before {
            content: '';
            position: absolute;
            top: -50px;
            right: -50px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            z-index: 0;
        }

        .cta::after {
            content: '';
            position: absolute;
            bottom: -100px;
            left: -100px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            z-index: 0;
        }

        .cta-content {
            position: relative;
            z-index: 1;
        }

        .cta-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
        }

        .cta-subtitle {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 2rem;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 1rem;
        }

        /* footer */
        .footer {
            background-color: var(--dark);
            color: white;
            padding: 80px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 60px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .footer-logo-icon {
            width: 40px;
            height: 40px;
            margin-right: 10px;
            background: var(--gradient-primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
        }

        .footer-about {
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }

        .social-icon:hover {
            background: var(--primary);
            transform: translateY(-5px);
        }

        .footer-title {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background: var(--primary);
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }

        .footer-contact-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 15px;
            color: rgba(255, 255, 255, 0.7);
        }

        .footer-contact-icon {
            color: var(--primary);
            margin-right: 15px;
            margin-top: 5px;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.5);
        }

        /* responsive design */
        @media (max-width: 992px) {
            .hero-content {
                flex-direction: column;
            }

            .hero-text, .hero-image {
                width: 100%;
                text-align: center;
            }

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

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

            .device-mockup {
                margin: 0 auto;
            }
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 2rem;
            }

            .hero-title {
                font-size: 2.5rem;
            }

            .nav-menu, .nav-buttons {
                display: none;
            }

            .menu-toggle {
                display: block;
            }

            .menu-toggle.active + .nav-menu {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: white;
                padding: 1rem;
                box-shadow: var(--shadow);
            }

            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
        }

        @media (max-width: 576px) {
            .hero-title {
                font-size: 2rem;
            }

            .stat-box-number {
                font-size: 2.5rem;
            }
        }