/* CSS Reset & Variables */
        :root {
            --primary: #10b981;
            --primary-hover: #059669;
            --primary-light: #e6f4ea;
            --secondary: #0ea5e9;
            --dark: #1f2937;
            --dark-title: #111827;
            --light-bg: #f4faf6;
            --white: #ffffff;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-400: #9ca3af;
            --gray-600: #4b5563;
            --shadow: 0 4px 20px rgba(16, 185, 129, 0.08);
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--white);
            color: var(--gray-600);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--primary-hover);
        }

        ul {
            list-style: none;
        }

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

        /* Common Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        section {
            padding: 80px 0;
            position: relative;
        }

        .section-bg {
            background-color: var(--light-bg);
        }

        /* Titles */
        .section-header {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }

        .section-header h2 {
            font-size: 2rem;
            color: var(--dark-title);
            margin-bottom: 12px;
            font-weight: 700;
        }

        .section-header p {
            color: var(--gray-600);
            max-width: 600px;
            margin: 0 auto;
            font-size: 1rem;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 500;
            border-radius: 8px;
            transition: var(--transition);
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background-color: var(--primary);
            color: var(--white);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
        }

        .btn-secondary {
            background-color: var(--white);
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary-light);
            transform: translateY(-2px);
        }

        /* Header Navigation */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            box-shadow: 0 1px 10px rgba(0, 0, 0, 0.05);
            z-index: 1000;
            transition: var(--transition);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-area img {
            height: 40px;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--dark-title);
        }

        .nav-menu {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .nav-item {
            color: var(--gray-600);
            font-weight: 500;
            padding: 8px 12px;
            font-size: 0.95rem;
        }

        .nav-item:hover, .nav-item.active {
            color: var(--primary);
        }

        .nav-action {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--gray-600);
        }

        /* Hero Section (No Image, Text & Clean Tech Layout Only) */
        .hero {
            padding: 150px 0 100px 0;
            background: linear-gradient(135deg, #f4faf6 0%, #e8f7ee 50%, #ffffff 100%);
            text-align: center;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background-color: var(--primary-light);
            color: var(--primary-hover);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero h1 {
            font-size: 2.8rem;
            color: var(--dark-title);
            line-height: 1.3;
            margin-bottom: 20px;
            font-weight: 800;
        }

        .hero p {
            font-size: 1.15rem;
            color: var(--gray-600);
            max-width: 800px;
            margin: 0 auto 36px auto;
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 48px;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            max-width: 900px;
            margin: 0 auto;
            background: var(--white);
            padding: 30px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(16, 185, 129, 0.05);
        }

        .stat-card h3 {
            font-size: 2rem;
            color: var(--primary-hover);
            margin-bottom: 6px;
        }

        .stat-card p {
            font-size: 0.875rem;
            color: var(--gray-600);
            margin: 0;
        }

        /* About Section (Software Intro) */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-content h3 {
            font-size: 1.8rem;
            color: var(--dark-title);
            margin-bottom: 16px;
        }

        .about-features {
            margin-top: 30px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .about-feat-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }

        .about-feat-item i {
            color: var(--primary);
            font-size: 1.2rem;
            margin-top: 3px;
        }

        .about-feat-item h4 {
            color: var(--dark-title);
            font-size: 1rem;
            margin-bottom: 4px;
        }

        /* Service Systems */
        .model-list-wrapper {
            background-color: var(--white);
            border-radius: 16px;
            padding: 30px;
            box-shadow: var(--shadow);
        }

        .model-title {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--dark-title);
            margin-bottom: 20px;
            text-align: center;
        }

        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }

        .model-tag {
            background-color: var(--gray-100);
            color: var(--gray-600);
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 0.875rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .model-tag:hover {
            background-color: var(--primary);
            color: var(--white);
        }

        /* Grid Services & Cards */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .service-card {
            background-color: var(--white);
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid rgba(16, 185, 129, 0.05);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 24px rgba(16, 185, 129, 0.12);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.25rem;
            color: var(--dark-title);
            margin-bottom: 12px;
        }

        /* Flow steps */
        .flow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .flow-step {
            background: var(--white);
            padding: 24px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 36px;
            height: 36px;
            background-color: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px auto;
            font-weight: 700;
        }

        .flow-step h4 {
            color: var(--dark-title);
            margin-bottom: 8px;
        }

        /* Networks & Solutions */
        .solution-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .solution-card {
            background: var(--white);
            border-radius: 16px;
            padding: 30px;
            box-shadow: var(--shadow);
        }

        .solution-card h3 {
            color: var(--dark-title);
            margin-bottom: 15px;
            font-size: 1.4rem;
        }

        .solution-list li {
            position: relative;
            padding-left: 20px;
            margin-bottom: 10px;
        }

        .solution-list li::before {
            content: "✓";
            color: var(--primary);
            position: absolute;
            left: 0;
            font-weight: bold;
        }

        /* Technical standards / Compare table */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: var(--white);
            border-radius: 12px;
            box-shadow: var(--shadow);
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }

        .compare-table th, .compare-table td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--gray-200);
        }

        .compare-table th {
            background-color: var(--primary-light);
            color: var(--dark-title);
            font-weight: 600;
        }

        .compare-table tr:hover {
            background-color: rgba(16, 185, 129, 0.02);
        }

        .highlight-col {
            background-color: rgba(16, 185, 129, 0.05);
            font-weight: 600;
            color: var(--primary-hover);
        }

        /* Cases Section */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .case-card {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray-200);
        }

        .case-img {
            position: relative;
            background: var(--gray-100);
            aspect-ratio: 16/10;
            overflow: hidden;
        }

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

        .case-info {
            padding: 20px;
        }

        .case-tag {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 4px 8px;
            font-size: 0.75rem;
            border-radius: 4px;
            margin-bottom: 10px;
        }

        .case-info h4 {
            color: var(--dark-title);
            margin-bottom: 8px;
        }

        /* Token Comparison Pricing */
        .price-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .price-card {
            background: var(--white);
            border-radius: 16px;
            padding: 30px;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray-200);
            text-align: center;
        }

        .price-card.featured {
            border: 2px solid var(--primary);
            transform: scale(1.03);
        }

        .price-header h4 {
            font-size: 1.25rem;
            color: var(--dark-title);
            margin-bottom: 10px;
        }

        .price-num {
            font-size: 2rem;
            color: var(--primary-hover);
            font-weight: 800;
            margin-bottom: 15px;
        }

        .price-num span {
            font-size: 0.875rem;
            color: var(--gray-600);
            font-weight: normal;
        }

        .price-features {
            margin: 20px 0;
            text-align: left;
        }

        .price-features li {
            margin-bottom: 8px;
            font-size: 0.9rem;
        }

        /* Education & Training Section */
        .training-container {
            background: var(--white);
            border-radius: 16px;
            padding: 40px;
            box-shadow: var(--shadow);
        }

        .training-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .training-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .training-item {
            padding: 15px;
            background: var(--light-bg);
            border-radius: 8px;
            border-left: 4px solid var(--primary);
        }

        .training-item h4 {
            color: var(--dark-title);
            margin-bottom: 5px;
        }

        /* FAQ Accordion */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            background: var(--white);
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
            border: 1px solid var(--gray-200);
            overflow: hidden;
        }

        .faq-question {
            width: 100%;
            padding: 18px 24px;
            text-align: left;
            background: none;
            border: none;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--dark-title);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-question::after {
            content: "+";
            font-size: 1.25rem;
            color: var(--primary);
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background-color: var(--light-bg);
        }

        .faq-answer-inner {
            padding: 18px 24px;
            font-size: 0.95rem;
            color: var(--gray-600);
            border-top: 1px solid var(--gray-200);
        }

        /* Comments / Testimonials */
        .comments-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .comment-card {
            background: var(--white);
            border-radius: 12px;
            padding: 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray-200);
        }

        .comment-text {
            font-style: italic;
            margin-bottom: 20px;
        }

        .comment-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .comment-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        .comment-meta h5 {
            color: var(--dark-title);
            margin: 0;
        }

        .comment-meta span {
            font-size: 0.75rem;
            color: var(--gray-400);
        }

        /* Articles Section */
        .articles-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .article-card {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray-200);
        }

        .article-body {
            padding: 20px;
        }

        .article-body h4 {
            color: var(--dark-title);
            margin-bottom: 10px;
        }

        /* Contact & Form Section */
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
        }

        .contact-info-panel {
            background: var(--light-bg);
            padding: 40px;
            border-radius: 16px;
        }

        .contact-info-panel h3 {
            color: var(--dark-title);
            margin-bottom: 20px;
            font-size: 1.5rem;
        }

        .contact-item-row {
            display: flex;
            align-items: flex-start;
            gap: 15px;
            margin-bottom: 25px;
        }

        .contact-item-row i {
            color: var(--primary);
            font-size: 1.25rem;
        }

        .qr-codes {
            display: flex;
            gap: 20px;
            margin-top: 30px;
        }

        .qr-item {
            text-align: center;
        }

        .qr-item img {
            width: 120px;
            height: 120px;
            border-radius: 8px;
            margin-bottom: 8px;
            border: 1px solid var(--gray-200);
        }

        .qr-item p {
            font-size: 0.75rem;
            color: var(--gray-600);
        }

        .form-panel {
            background: var(--white);
            padding: 40px;
            border-radius: 16px;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray-200);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 6px;
            color: var(--dark-title);
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--gray-200);
            border-radius: 8px;
            outline: none;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
        }

        /* Footer */
        .footer {
            background-color: var(--dark-title);
            color: var(--gray-400);
            padding: 60px 0 30px 0;
            border-top: 1px solid var(--dark);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--white);
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col a {
            color: var(--gray-400);
        }

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

        .friend-links a {
            display: inline-block;
            margin-right: 12px;
            margin-bottom: 8px;
            font-size: 0.875rem;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }

        /* Floating customer service */
        .floating-service {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            z-index: 999;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--white);
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            color: var(--primary);
            position: relative;
        }

        .float-btn:hover {
            background-color: var(--primary);
            color: var(--white);
        }

        .float-btn .hover-qr {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: var(--white);
            padding: 10px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            display: none;
            text-align: center;
        }

        .float-btn:hover .hover-qr {
            display: block;
        }

        .float-btn .hover-qr img {
            width: 100px;
            height: 100px;
        }

        /* Responsive styling */
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid, .training-grid, .contact-wrapper {
                grid-template-columns: 1fr;
            }
            .flow-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .comments-grid, .articles-list, .case-grid, .price-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: var(--white);
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 5px 10px rgba(0,0,0,0.05);
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-toggle {
                display: block;
            }
        }

        @media (max-width: 600px) {
            .hero-stats, .flow-steps, .comments-grid, .articles-list, .case-grid, .price-grid, .footer-grid, .solution-grid {
                grid-template-columns: 1fr;
            }
            .price-card.featured {
                transform: none;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
        }