:root {
            --primary: #4F46E5;
            --primary-light: #818CF8;
            --accent: #06B6D4;
            --highlight: #F59E0B;
            --dark: #0F172A;
            --light: #F8FAFC;
            --white: #FFFFFF;
            --gray: #64748B;
            --border-color: #E2E8F0;
            --container-max: 1200px;
        }

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

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: all 0.3s ease;
        }

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

        /* Container Layout */
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Typography */
        h1, h2, h3, h4 {
            color: var(--dark);
            font-weight: 800;
        }

        h2 {
            font-size: 2.2rem;
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
            letter-spacing: -0.025em;
        }

        h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            margin: 12px auto 0;
            border-radius: 2px;
        }

        /* Header & Navigation */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 70px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

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

        .brand-logo img {
            height: 36px;
        }

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

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 24px;
        }

        .nav-menu a {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--dark);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            border: 2px solid transparent;
        }

        .btn-primary {
            background-color: var(--primary);
            color: var(--white);
            box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
        }

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

        .btn-accent {
            background-color: var(--accent);
            color: var(--dark);
        }

        .btn-accent:hover {
            background-color: #22d3ee;
            transform: translateY(-2px);
        }

        .btn-outline {
            border-color: var(--dark);
            color: var(--dark);
            background: transparent;
        }

        .btn-outline:hover {
            background: var(--dark);
            color: var(--white);
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
        }

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background: var(--dark);
            transition: all 0.3s;
        }

        /* Hero Section (No Images) */
        .hero {
            padding: 160px 0 100px;
            background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.1), transparent), 
                        radial-gradient(circle at 10% 80%, rgba(79, 70, 229, 0.08), transparent), 
                        var(--white);
            text-align: center;
        }

        .hero h1 {
            font-size: 3rem;
            line-height: 1.2;
            max-width: 800px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, var(--dark) 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.25rem;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto 40px;
        }

        .hero-features {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            max-width: 900px;
            margin: 50px auto 0;
        }

        .h-feat-card {
            background: var(--white);
            border: 2px solid var(--dark);
            border-radius: 12px;
            padding: 24px 15px;
            text-align: center;
            box-shadow: 4px 4px 0px var(--dark);
            transition: all 0.2s ease;
        }

        .h-feat-card:hover {
            transform: translate(-2px, -2px);
            box-shadow: 6px 6px 0px var(--dark);
        }

        .h-feat-card h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: var(--primary);
        }

        .h-feat-card p {
            font-size: 0.85rem;
            color: var(--gray);
        }

        /* Generic Section Styling */
        section {
            padding: 90px 0;
        }

        /* About Us Section */
        .about {
            background-color: var(--white);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--gray);
            margin-bottom: 24px;
            font-size: 1.05rem;
        }

        .about-badge-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .badge-card {
            border-left: 4px solid var(--accent);
            padding-left: 15px;
        }

        .badge-card h4 {
            font-size: 1.1rem;
            margin-bottom: 5px;
        }

        .badge-card p {
            font-size: 0.9rem;
            color: var(--gray);
            margin: 0;
        }

        .about-visual {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 20px;
            padding: 40px;
            color: var(--white);
            box-shadow: 8px 8px 0px var(--dark);
            border: 3px solid var(--dark);
        }

        .about-visual h4 {
            color: var(--white);
            font-size: 1.5rem;
            margin-bottom: 15px;
        }

        /* Service Cards */
        .services {
            background-color: var(--light);
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: var(--white);
            border: 2px solid var(--border-color);
            padding: 30px;
            border-radius: 16px;
            transition: all 0.3s ease;
        }

        .service-card:hover {
            border-color: var(--primary);
            transform: translateY(-5px);
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            background: rgba(79, 70, 229, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.3rem;
            margin-bottom: 12px;
        }

        .service-card p {
            color: var(--gray);
            font-size: 0.95rem;
        }

        /* Tag Cloud Styling */
        .tags-wrapper {
            margin-top: 50px;
            text-align: center;
        }

        .tags-wrapper h4 {
            margin-bottom: 15px;
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            max-width: 800px;
            margin: 0 auto;
        }

        .tag-item {
            background: var(--white);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--dark);
        }

        .tag-item:hover {
            border-color: var(--accent);
            background: rgba(6, 182, 212, 0.05);
        }

        /* Process Steps */
        .process {
            background-color: var(--white);
        }

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

        .step-card {
            text-align: center;
            background: var(--light);
            border-radius: 16px;
            padding: 30px 20px;
            border: 2px solid var(--border-color);
            position: relative;
        }

        .step-num {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--dark);
            color: var(--white);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin-bottom: 20px;
        }

        /* Solutions */
        .solutions {
            background-color: var(--light);
        }

        .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .sol-card {
            background: var(--white);
            border: 2px solid var(--dark);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 6px 6px 0px var(--dark);
        }

        .sol-header {
            background: var(--dark);
            color: var(--white);
            padding: 20px;
            font-weight: bold;
        }

        .sol-body {
            padding: 24px;
        }

        .sol-body ul {
            list-style: none;
        }

        .sol-body li {
            position: relative;
            padding-left: 20px;
            margin-bottom: 12px;
            font-size: 0.95rem;
        }

        .sol-body li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: bold;
        }

        /* Network & Global Network */
        .network {
            background-color: var(--white);
        }

        .network-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .net-locations {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .loc-item {
            background: var(--light);
            border-radius: 10px;
            padding: 20px;
            border-left: 4px solid var(--primary);
        }

        /* Comparison Board */
        .comparison {
            background-color: var(--light);
        }

        .score-box {
            text-align: center;
            margin-bottom: 40px;
        }

        .score-value {
            font-size: 4rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
        }

        .rating-stars {
            color: var(--highlight);
            font-size: 1.8rem;
            margin: 10px 0;
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: var(--white);
            border-radius: 16px;
            border: 2px solid var(--dark);
            box-shadow: 6px 6px 0px var(--dark);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 600px;
        }

        th, td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        th {
            background: var(--dark);
            color: var(--white);
        }

        tr:last-child td {
            border-bottom: none;
        }

        .highlight-cell {
            background: rgba(79, 70, 229, 0.05);
            font-weight: 600;
        }

        /* Pricing Table */
        .pricing {
            background-color: var(--white);
        }

        .price-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .price-card {
            border: 2px solid var(--border-color);
            border-radius: 16px;
            padding: 40px 30px;
            background: var(--white);
            position: relative;
            text-align: center;
        }

        .price-card.popular {
            border-color: var(--primary);
            box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.15);
        }

        .price-card.popular::before {
            content: "热门首选";
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--primary);
            color: var(--white);
            padding: 4px 14px;
            font-size: 0.8rem;
            border-radius: 20px;
            font-weight: bold;
        }

        .price-val {
            font-size: 2.2rem;
            font-weight: 800;
            margin: 20px 0;
            color: var(--dark);
        }

        .price-features {
            list-style: none;
            margin: 30px 0;
            text-align: left;
        }

        .price-features li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.95rem;
        }

        /* Portfolio / Case Studies */
        .cases {
            background-color: var(--light);
        }

        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background: var(--white);
            border-radius: 16px;
            overflow: hidden;
            border: 2px solid var(--border-color);
        }

        .case-img-container {
            width: 100%;
            height: 200px;
            background: #e2e8f0;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }

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

        .case-body {
            padding: 24px;
        }

        .case-body h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
        }

        .case-body p {
            color: var(--gray);
            font-size: 0.9rem;
            margin-bottom: 15px;
        }

        /* User Reviews */
        .reviews {
            background-color: var(--white);
        }

        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .review-card {
            background: var(--light);
            border-radius: 16px;
            padding: 30px;
            border: 1px solid var(--border-color);
            position: relative;
        }

        .review-header {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }

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

        .review-user-info h4 {
            font-size: 1rem;
        }

        .review-user-info p {
            font-size: 0.8rem;
            color: var(--gray);
        }

        .review-card p.content {
            font-size: 0.95rem;
            color: var(--dark);
            font-style: italic;
        }

        /* FAQS Accordion */
        .faq {
            background-color: var(--light);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--white);
            border: 2px solid var(--border-color);
            border-radius: 12px;
            margin-bottom: 15px;
            overflow: hidden;
            transition: all 0.3s;
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-question::after {
            content: "+";
            font-size: 1.5rem;
            color: var(--primary);
            transition: transform 0.3s;
        }

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

        .faq-answer-inner {
            padding: 20px 24px;
            font-size: 0.95rem;
            color: var(--gray);
            border-top: 1px solid var(--border-color);
        }

        .faq-item.active {
            border-color: var(--primary);
        }

        .faq-item.active .faq-question::after {
            content: "−";
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
        }

        /* Troubleshooting section */
        .troubleshoot {
            background-color: var(--white);
        }

        .troubleshoot-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .trouble-card {
            border: 2px solid var(--dark);
            border-radius: 8px;
            padding: 20px;
            box-shadow: 4px 4px 0px var(--dark);
        }

        /* Glossary Block */
        .glossary {
            background-color: var(--light);
        }

        .glossary-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .glossary-card {
            background: var(--white);
            padding: 20px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        /* Knowledge Base Articles */
        .articles {
            background-color: var(--white);
        }

        .articles-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .article-item {
            background: var(--light);
            border-radius: 12px;
            padding: 24px;
            border-left: 5px solid var(--accent);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        /* Form styling */
        .contact {
            background-color: var(--light);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 50px;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .qr-wrapper {
            margin-top: 30px;
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .qr-card {
            background: var(--white);
            padding: 15px;
            border-radius: 12px;
            border: 2px solid var(--dark);
            text-align: center;
            width: 140px;
        }

        .qr-card img {
            width: 100%;
            height: auto;
            border-radius: 6px;
        }

        .qr-card p {
            font-size: 0.8rem;
            margin-top: 8px;
            font-weight: 700;
        }

        form {
            background: var(--white);
            border: 2px solid var(--dark);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 8px 8px 0px var(--dark);
        }

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

        label {
            display: block;
            font-weight: 700;
            margin-bottom: 8px;
        }

        input, select, textarea {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.25s;
        }

        input:focus, select:focus, textarea:focus {
            border-color: var(--primary);
            outline: none;
        }

        /* Footer & Friendship Links */
        footer {
            background-color: var(--dark);
            color: #94a3b8;
            padding: 60px 0 30px;
            border-top: 4px solid var(--primary);
        }

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

        .footer-logo img {
            height: 40px;
            margin-bottom: 15px;
        }

        .footer-links h4 {
            color: var(--white);
            margin-bottom: 15px;
        }

        .footer-links ul {
            list-style: none;
        }

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

        .footer-links a {
            color: #94a3b8;
        }

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

        .friend-links {
            margin-top: 30px;
            border-top: 1px solid #334155;
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 0.85rem;
        }

        .friend-links a {
            color: #64748b;
        }

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

        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }

        /* Floating widget */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--white);
            border: 2px solid var(--dark);
            box-shadow: 4px 4px 0px var(--dark);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            position: relative;
        }

        .float-qr {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: var(--white);
            border: 2px solid var(--dark);
            padding: 10px;
            border-radius: 8px;
            display: none;
            width: 150px;
        }

        .float-qr img {
            width: 100%;
            height: auto;
        }

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

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .hero-features {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid, .contact-grid {
                grid-template-columns: 1fr;
            }
            .solution-grid, .pricing-grid, .case-grid, .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: var(--white);
                padding: 20px;
                border-bottom: 2px solid var(--dark);
                gap: 15px;
            }
            .nav-menu.active {
                display: flex;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero-features {
                grid-template-columns: 1fr;
            }
            .process-steps {
                grid-template-columns: 1fr;
            }
            .solution-grid, .pricing-grid, .case-grid, .review-grid, .troubleshoot-grid, .glossary-grid, .articles-list {
                grid-template-columns: 1fr;
            }
            .score-value {
                font-size: 3rem;
            }
        }