:root {
            --primary-color: #0f4c81; /* 经典宝蓝 */
            --primary-light: #e6f0fa;
            --accent-color: #00a4ff; /* 明艳亮蓝 */
            --text-dark: #1e293b;
            --text-muted: #64748b;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --border-color: #e2e8f0;
            --success-color: #10b981;
            --warning-color: #f5a623;
            --container-width: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans CJK SC", sans-serif;
            color: var(--text-dark);
            background-color: var(--bg-light);
            line-height: 1.6;
        }

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

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

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

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

        /* Headers & Sections */
        section {
            padding: 80px 0;
            position: relative;
        }

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

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

        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-title h2 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--accent-color);
            margin: 10px auto 0 auto;
            border-radius: 2px;
        }

        .section-title p {
            font-size: 1.1rem;
            color: var(--text-muted);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: #fff !important;
            box-shadow: 0 4px 14px rgba(15, 76, 129, 0.3);
        }

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

        .btn-accent {
            background-color: var(--accent-color);
            color: #fff !important;
            box-shadow: 0 4px 14px rgba(0, 164, 255, 0.3);
        }

        .btn-accent:hover {
            background-color: #008be0;
            transform: translateY(-2px);
        }

        .btn-outline {
            background-color: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }

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

        /* Header Navigation */
        .site-header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 15px 0;
        }

        .header-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

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

        .logo-box img {
            height: 45px;
            width: auto;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 20px;
        }

        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-dark);
            padding: 8px 4px;
            border-bottom: 2px solid transparent;
            transition: all 0.3s ease;
        }

        .nav-link:hover {
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        /* Mobile Nav Toggle */
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--primary-color);
        }

        /* Hero Section (No Images allowed) */
        .hero-section {
            background: linear-gradient(135deg, #072146 0%, #0f4c81 50%, #1e4f8a 100%);
            color: #ffffff;
            padding: 120px 0 100px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(0, 164, 255, 0.15) 0%, transparent 60%);
            pointer-events: none;
        }

        .hero-content {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .hero-tagline {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.9rem;
            margin-bottom: 25px;
            letter-spacing: 1px;
            color: var(--accent-color);
        }

        .hero-title {
            font-size: 3rem;
            line-height: 1.25;
            margin-bottom: 25px;
            font-weight: 800;
        }

        .hero-desc {
            font-size: 1.25rem;
            opacity: 0.9;
            margin-bottom: 40px;
            max-width: 750px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        /* Data Cards (Hero Bottom) */
        .data-cards {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 60px;
        }

        .data-card {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            padding: 25px;
            border-radius: 12px;
            text-align: center;
            transition: transform 0.3s;
        }

        .data-card:hover {
            transform: translateY(-5px);
        }

        .data-number {
            font-size: 2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 5px;
        }

        .data-label {
            font-size: 0.9rem;
            opacity: 0.8;
        }

        /* About us & Platform intro */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 1.05rem;
        }

        .feature-bullets {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .feature-bullet-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-dark);
        }

        .feature-bullet-item::before {
            content: "✓";
            color: var(--success-color);
            font-weight: bold;
        }

        /* Services Cards */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 30px;
            border-radius: 12px;
            transition: all 0.3s ease;
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(15, 76, 129, 0.08);
            border-color: var(--accent-color);
        }

        .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-color);
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.3rem;
            margin-bottom: 12px;
            color: var(--primary-color);
        }

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

        /* Process Steps */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            position: relative;
        }

        .process-step {
            text-align: center;
            position: relative;
            background: var(--bg-white);
            padding: 30px 20px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
        }

        .step-number {
            width: 45px;
            height: 45px;
            background-color: var(--primary-color);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
            margin: 0 auto 20px auto;
        }

        .process-step h4 {
            font-size: 1.15rem;
            margin-bottom: 10px;
            color: var(--primary-color);
        }

        .process-step p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* Solutions Area with Image Container */
        .solutions-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .solution-images {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .solution-images img {
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }

        .image-caption {
            font-size: 0.8rem;
            color: var(--text-muted);
            text-align: center;
            margin-top: 5px;
        }

        /* Network & Standards */
        .double-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .info-panel {
            background-color: var(--bg-white);
            padding: 40px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .info-panel h3 {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-bottom: 25px;
            border-left: 4px solid var(--accent-color);
            padding-left: 15px;
        }

        .standard-list {
            list-style: none;
        }

        .standard-item {
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border-color);
        }

        .standard-item:last-child {
            border-bottom: none;
        }

        .standard-item strong {
            display: block;
            color: var(--primary-color);
            margin-bottom: 5px;
        }

        /* Comparison Table */
        .table-responsive {
            overflow-x: auto;
            background-color: var(--bg-white);
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
            border: 1px solid var(--border-color);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .comparison-table th, .comparison-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.95rem;
        }

        .comparison-table th {
            background-color: var(--primary-color);
            color: #fff;
        }

        .comparison-table tr:hover {
            background-color: var(--bg-light);
        }

        .highlight-col {
            background-color: rgba(0, 164, 255, 0.05);
            font-weight: 600;
        }

        .rating-box {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-top: 30px;
            background: var(--primary-light);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid rgba(15, 76, 129, 0.1);
        }

        .rating-score {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
        }

        /* Pricing & Tokens */
        .pricing-section {
            background: linear-gradient(to bottom, var(--bg-light), var(--bg-white));
        }

        .token-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
            margin-bottom: 40px;
        }

        .token-card {
            background: var(--bg-white);
            border: 2px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s ease;
        }

        .token-card.popular {
            border-color: var(--accent-color);
            transform: scale(1.03);
            box-shadow: 0 10px 30px rgba(0, 164, 255, 0.1);
            position: relative;
        }

        .badge {
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent-color);
            color: #fff;
            padding: 4px 15px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: bold;
        }

        .token-card h4 {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: var(--primary-color);
        }

        .price-num {
            font-size: 2.2rem;
            font-weight: bold;
            color: var(--text-dark);
            margin-bottom: 20px;
        }

        .price-num span {
            font-size: 1rem;
            color: var(--text-muted);
            font-weight: normal;
        }

        .price-features {
            list-style: none;
            margin-bottom: 25px;
            text-align: left;
        }

        .price-features li {
            padding: 8px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .price-features li::before {
            content: "• ";
            color: var(--accent-color);
            font-weight: bold;
        }

        /* Form Area */
        .form-container {
            max-width: 700px;
            margin: 0 auto;
            background: var(--bg-white);
            padding: 45px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            border: 1px solid var(--border-color);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 25px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .form-group-full {
            grid-column: span 2;
        }

        .form-group label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-dark);
        }

        .form-control {
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.3s;
        }

        .form-control:focus {
            border-color: var(--accent-color);
        }

        /* Training section */
        .training-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .training-card {
            background-color: var(--bg-white);
            border-top: 4px solid var(--primary-color);
            padding: 25px;
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            text-align: center;
        }

        .training-card h4 {
            font-size: 1.1rem;
            margin-bottom: 12px;
            color: var(--primary-color);
        }

        /* Cases and News */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-bottom: 50px;
        }

        .case-card {
            background: var(--bg-white);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .case-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .case-info {
            padding: 20px;
        }

        .case-info h4 {
            font-size: 1.15rem;
            color: var(--primary-color);
            margin-bottom: 8px;
        }

        .case-info p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

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

        .news-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .news-item {
            background: var(--bg-white);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            transition: border-color 0.3s;
        }

        .news-item:hover {
            border-color: var(--primary-color);
        }

        .news-item a {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-dark);
            display: block;
            margin-bottom: 10px;
        }

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

        .news-meta {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* FAQ Accordion */
        .faq-grid {
            max-width: 850px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border-color);
            background-color: var(--bg-white);
            border-radius: 8px;
            margin-bottom: 15px;
            overflow: hidden;
        }

        .faq-question {
            padding: 20px;
            font-weight: 600;
            color: var(--primary-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-question::after {
            content: "+";
            font-size: 1.2rem;
            font-weight: bold;
            color: var(--text-muted);
            transition: transform 0.3s;
        }

        .faq-item.active .faq-question::after {
            content: "−";
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 0 20px 20px 20px;
        }

        /* Troubleshooting & Glossary */
        .trouble-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 40px;
        }

        .trouble-card {
            background-color: var(--bg-white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .trouble-card h4 {
            font-size: 1.2rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }

        .trouble-card ul {
            list-style-type: none;
            padding-left: 0;
        }

        .trouble-card li {
            position: relative;
            padding-left: 20px;
            margin-bottom: 10px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .trouble-card li::before {
            content: "●";
            position: absolute;
            left: 0;
            color: var(--accent-color);
        }

        /* User Reviews */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .review-card {
            background: var(--bg-white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            position: relative;
        }

        .review-quote {
            font-style: italic;
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 0.95rem;
        }

        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .author-avatar {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background-color: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--primary-color);
        }

        .author-info h5 {
            font-size: 0.95rem;
            color: var(--text-dark);
            margin-bottom: 2px;
        }

        .author-info p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Contact Details & QR */
        .contact-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 50px;
            align-items: flex-start;
        }

        .contact-info-list {
            list-style: none;
        }

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

        .contact-info-item svg {
            width: 24px;
            height: 24px;
            color: var(--primary-color);
            flex-shrink: 0;
        }

        .contact-info-content h4 {
            font-size: 1.1rem;
            color: var(--primary-color);
            margin-bottom: 5px;
        }

        .contact-info-content p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        .contact-qr-wrapper {
            background-color: var(--bg-white);
            padding: 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            text-align: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.03);
        }

        .qr-box {
            display: flex;
            justify-content: center;
            margin: 20px 0;
        }

        .qr-box img {
            width: 180px;
            height: 180px;
            border: 1px solid var(--border-color);
            padding: 5px;
            border-radius: 8px;
        }

        /* Footer */
        .site-footer {
            background-color: #07172b;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
        }

        .footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 50px;
            padding-bottom: 40px;
            border-bottom: 1px solid #1e293b;
        }

        .footer-logo {
            margin-bottom: 20px;
        }

        .footer-logo img {
            height: 40px;
            filter: brightness(0) invert(1);
        }

        .footer-links-title {
            color: #f1f5f9;
            font-weight: 600;
            margin-bottom: 20px;
        }

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

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

        .footer-links-list a {
            color: #94a3b8;
            transition: color 0.3s;
        }

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

        .footer-bottom {
            padding-top: 30px;
            text-align: center;
            font-size: 0.85rem;
        }

        .friend-links {
            margin-bottom: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
        }

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

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

        /* Float Widget */
        .float-widget {
            position: fixed;
            right: 25px;
            bottom: 25px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .widget-item {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 10px rgba(0,0,0,0.15);
            cursor: pointer;
            transition: all 0.3s;
            position: relative;
        }

        .widget-item:hover {
            background-color: var(--accent-color);
            transform: scale(1.1);
        }

        .widget-item svg {
            width: 24px;
            height: 24px;
            fill: currentColor;
        }

        .widget-popover {
            position: absolute;
            right: 65px;
            bottom: 0;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            display: none;
            width: 200px;
            text-align: center;
            color: var(--text-dark);
        }

        .widget-popover img {
            width: 150px;
            height: 150px;
            margin: 0 auto 10px auto;
        }

        .widget-item:hover .widget-popover {
            display: block;
        }

        .back-to-top {
            display: none;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .data-cards, .services-grid, .process-steps, .cases-grid, .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .token-grid {
                grid-template-columns: 1fr;
            }
            .about-grid, .solutions-grid, .double-grid, .contact-grid {
                grid-template-columns: 1fr;
            }
            .hero-title {
                font-size: 2.4rem;
            }
        }

        @media (max-width: 768px) {
            .mobile-nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--bg-white);
                padding: 20px;
                box-shadow: 0 4px 10px rgba(0,0,0,0.05);
            }
            .nav-menu.active {
                display: flex;
            }
            .data-cards, .services-grid, .process-steps, .cases-grid, .reviews-grid {
                grid-template-columns: 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group-full {
                grid-column: span 1;
            }
            .footer-top {
                grid-template-columns: 1fr;
            }
            .trouble-grid {
                grid-template-columns: 1fr;
            }
        }