/* CSS Reset & Variable Design (亮橙炽艳风) */
        :root {
            --primary: #FF5722;
            --primary-hover: #E64A19;
            --secondary: #FF9800;
            --secondary-light: #FFF3E0;
            --dark: #212121;
            --light-dark: #424242;
            --bg-light: #FAFAFA;
            --bg-white: #FFFFFF;
            --border-color: #E0E0E0;
            --accent: #E91E63;
            --shadow: 0 4px 20px rgba(255, 87, 34, 0.08);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-width: 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(--bg-light);
            color: var(--dark);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        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;
        }

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

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

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

        .section-title {
            font-size: 2.2rem;
            color: var(--dark);
            position: relative;
            display: inline-block;
            padding-bottom: 15px;
            font-weight: 700;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
        }

        .section-subtitle {
            color: var(--light-dark);
            font-size: 1.1rem;
            margin-top: 10px;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            font-size: 1rem;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--bg-white);
            box-shadow: 0 4px 15px rgba(255, 87, 34, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 87, 34, 0.4);
            color: var(--bg-white);
        }

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

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

        /* Header Navigation */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: 70px;
            display: flex;
            align-items: center;
        }

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

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

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

        .logo-title {
            font-size: 1.3rem;
            font-weight: 800;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        .nav-item {
            color: var(--dark);
            font-weight: 500;
            padding: 5px 10px;
            border-radius: 4px;
        }

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

        .mobile-nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            border: none;
            background: transparent;
        }

        .mobile-nav-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            transition: var(--transition);
        }

        /* Hero Section (No Image Allowed) */
        .hero {
            background: radial-gradient(circle at 10% 20%, rgba(255, 87, 34, 0.05) 0%, rgba(255, 152, 0, 0.05) 90.1%), var(--bg-white);
            padding: 150px 0 100px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,87,34,0.02) 0%, transparent 80%);
            pointer-events: none;
        }

        .hero-h1 {
            font-size: 3rem;
            line-height: 1.2;
            color: var(--dark);
            font-weight: 800;
            margin-bottom: 20px;
        }

        .hero-h1 span {
            color: var(--primary);
            position: relative;
        }

        .hero-desc {
            font-size: 1.3rem;
            color: var(--light-dark);
            max-width: 800px;
            margin: 0 auto 40px auto;
        }

        .hero-features {
            display: flex;
            justify-content: center;
            gap: 30px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .hero-feature-item {
            background: var(--bg-white);
            padding: 10px 20px;
            border-radius: 20px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
            font-weight: 500;
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hero-feature-item::before {
            content: '✓';
            color: var(--primary);
            font-weight: bold;
        }

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

        /* Stats Cards */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: -50px;
            position: relative;
            z-index: 10;
        }

        .stats-card {
            background: var(--bg-white);
            padding: 30px 20px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            text-align: center;
            border-top: 4px solid var(--primary);
            transition: var(--transition);
        }

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

        .stats-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .stats-label {
            font-size: 0.95rem;
            color: var(--light-dark);
        }

        /* About Us & Platform Intro */
        .about-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

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

        .about-text p {
            margin-bottom: 15px;
            color: var(--light-dark);
        }

        .about-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 25px;
        }

        .about-tag {
            background-color: var(--secondary-light);
            color: var(--primary);
            padding: 6px 15px;
            border-radius: 15px;
            font-size: 0.9rem;
            font-weight: 500;
        }

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

        .about-contact-card h4 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--dark);
            border-left: 4px solid var(--primary);
            padding-left: 10px;
        }

        .contact-info-list li {
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        /* Service Cards & Abilities */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .service-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            transform: scaleX(0);
            transform-origin: left;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }

        .service-card:hover::after {
            transform: scaleX(1);
        }

        .service-icon {
            font-size: 2.5rem;
            margin-bottom: 20px;
            display: inline-block;
        }

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

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

        /* Models Marquee Styles */
        .models-wrapper {
            background-color: var(--bg-white);
            padding: 40px 0;
            border-y: 1px solid var(--border-color);
        }

        .models-list {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
        }

        .model-badge {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            color: var(--light-dark);
            transition: var(--transition);
        }

        .model-badge:hover {
            border-color: var(--primary);
            color: var(--primary);
            background-color: var(--secondary-light);
        }

        /* Process Steps */
        .step-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 25px;
        }

        .step-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 30px 20px;
            border-radius: 12px;
            text-align: center;
            position: relative;
        }

        .step-num {
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--bg-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            box-shadow: 0 4px 10px rgba(255, 87, 34, 0.3);
        }

        .step-card h3 {
            margin-top: 15px;
            margin-bottom: 10px;
            font-size: 1.2rem;
        }

        .step-card p {
            color: var(--light-dark);
            font-size: 0.9rem;
        }

        /* Network Section */
        .network-section {
            background-color: var(--bg-white);
        }

        .network-map-wrap {
            max-width: 800px;
            margin: 0 auto 30px auto;
            text-align: center;
        }

        .network-cities {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
        }

        .city-tag {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 4px;
            font-size: 0.9rem;
            color: var(--dark);
        }

        /* Comparison Table & Assessment */
        .compare-section {
            background: var(--bg-white);
        }

        .assessment-highlight {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 30px;
            background: linear-gradient(135deg, var(--secondary-light), #FFF8E1);
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 40px;
            border: 1px dashed var(--primary);
        }

        .assessment-score {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
        }

        .table-responsive {
            overflow-x: auto;
            box-shadow: var(--shadow);
            border-radius: 12px;
            background: var(--bg-white);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 800px;
        }

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

        th {
            background-color: var(--bg-light);
            font-weight: 700;
            color: var(--dark);
        }

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

        .highlight-col {
            background-color: rgba(255, 87, 34, 0.03);
            font-weight: 600;
        }

        .status-check {
            color: #4CAF50;
            font-weight: bold;
        }

        .status-cross {
            color: #F44336;
        }

        /* Token Price Table */
        .price-section {
            background-color: var(--bg-light);
        }

        /* Case Studies (with Images) */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

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

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }

        .case-img-wrap {
            height: 200px;
            overflow: hidden;
            background-color: #eee;
        }

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

        .case-content {
            padding: 20px;
        }

        .case-content h4 {
            font-size: 1.15rem;
            margin-bottom: 10px;
            color: var(--dark);
        }

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

        .case-tag {
            font-size: 0.8rem;
            color: var(--primary);
            background-color: var(--secondary-light);
            padding: 3px 10px;
            border-radius: 10px;
            display: inline-block;
        }

        /* Training Section */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 15px;
        }

        .training-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            transition: var(--transition);
        }

        .training-card:hover {
            border-color: var(--primary);
            background-color: var(--secondary-light);
        }

        .training-icon {
            font-size: 2rem;
            margin-bottom: 10px;
            display: block;
        }

        .training-card h4 {
            font-size: 1rem;
            color: var(--dark);
        }

        /* FAQ Accordion */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

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

        .faq-header {
            padding: 20px;
            background: var(--bg-white);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
        }

        .faq-header::after {
            content: '+';
            font-size: 1.2rem;
            color: var(--primary);
            transition: var(--transition);
        }

        .faq-item.active .faq-header::after {
            content: '−';
        }

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

        .faq-content {
            padding: 20px;
            font-size: 0.95rem;
            color: var(--light-dark);
            border-top: 1px solid var(--border-color);
        }

        /* Self Troubleshooting & Encyclopedia */
        .help-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

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

        .help-box h3 {
            margin-bottom: 20px;
            color: var(--dark);
            border-bottom: 2px solid var(--secondary-light);
            padding-bottom: 10px;
        }

        .help-list li {
            margin-bottom: 12px;
            position: relative;
            padding-left: 20px;
        }

        .help-list li::before {
            content: '●';
            color: var(--secondary);
            position: absolute;
            left: 0;
        }

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

        .comment-card {
            background: var(--bg-white);
            padding: 25px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            position: relative;
        }

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

        .avatar-placeholder {
            width: 45px;
            height: 45px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
        }

        .user-meta h5 {
            font-size: 1rem;
            color: var(--dark);
        }

        .user-meta span {
            font-size: 0.8rem;
            color: var(--light-dark);
        }

        .comment-text {
            color: var(--light-dark);
            font-size: 0.95rem;
            font-style: italic;
        }

        /* Articles List (Knowledge Base) */
        .article-list-wrap {
            background-color: var(--bg-white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .article-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid var(--border-color);
        }

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

        .article-title-link {
            font-weight: 500;
            color: var(--dark);
        }

        .article-title-link:hover {
            color: var(--primary);
        }

        .article-date {
            color: var(--light-dark);
            font-size: 0.9rem;
        }

        /* Form Area */
        .form-section {
            background: linear-gradient(135deg, var(--dark) 0%, #1a1a1a 100%);
            color: var(--bg-white);
        }

        .form-section .section-title {
            color: var(--bg-white);
        }

        .form-section .section-subtitle {
            color: #ccc;
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
            align-items: start;
        }

        .custom-form {
            background-color: rgba(255,255,255,0.05);
            padding: 40px;
            border-radius: 12px;
            border: 1px solid rgba(255,255,255,0.1);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            font-size: 0.95rem;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border-radius: 6px;
            border: 1px solid rgba(255,255,255,0.2);
            background-color: rgba(0,0,0,0.2);
            color: var(--bg-white);
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 5px rgba(255,87,34,0.5);
        }

        select.form-control option {
            background-color: var(--dark);
            color: var(--bg-white);
        }

        /* Contact Details & QR */
        .contact-details {
            background-color: rgba(255,255,255,0.02);
            border: 1px solid rgba(255,255,255,0.1);
            padding: 30px;
            border-radius: 12px;
        }

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

        .qr-item {
            text-align: center;
            flex: 1;
            min-width: 120px;
        }

        .qr-item img {
            border-radius: 8px;
            margin: 0 auto 10px auto;
            width: 120px;
            height: 120px;
            object-fit: cover;
        }

        .qr-item span {
            font-size: 0.85rem;
            color: #bbb;
        }

        /* Friendly Links */
        .friend-links {
            background-color: var(--bg-light);
            border-top: 1px solid var(--border-color);
            padding: 20px 0;
            text-align: center;
        }

        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
            margin-top: 10px;
        }

        .friend-links-list a {
            font-size: 0.9rem;
            color: var(--light-dark);
        }

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

        /* Footer */
        footer {
            background-color: var(--dark);
            color: #888;
            padding: 30px 0;
            text-align: center;
            font-size: 0.9rem;
            border-top: 1px solid #333;
        }

        /* Back to top & Floating Chat */
        .floating-chat {
            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-color: var(--primary);
            color: var(--bg-white);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 10px rgba(0,0,0,0.2);
            cursor: pointer;
            transition: var(--transition);
            font-size: 1.2rem;
            border: none;
            position: relative;
        }

        .float-btn:hover {
            background-color: var(--primary-hover);
            transform: scale(1.05);
        }

        .float-btn .qrcode-hover {
            display: none;
            position: absolute;
            bottom: 60px;
            right: 0;
            background: white;
            padding: 10px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            border: 1px solid var(--border-color);
        }

        .float-btn .qrcode-hover img {
            width: 120px;
            height: 120px;
        }

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

        #back-to-top {
            background-color: var(--light-dark);
            display: none;
        }

        #back-to-top:hover {
            background-color: var(--dark);
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                margin-top: 20px;
            }
            .about-grid, .form-grid {
                grid-template-columns: 1fr;
            }
            .service-grid, .case-grid, .comments-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .training-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .faq-grid, .help-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: var(--bg-white);
                flex-direction: column;
                padding: 20px;
                border-top: 1px solid var(--border-color);
                box-shadow: 0 4px 10px rgba(0,0,0,0.05);
            }
            .nav-menu.active {
                display: flex;
            }
            .mobile-nav-toggle {
                display: flex;
            }
            .hero-h1 {
                font-size: 2.2rem;
            }
            .hero-desc {
                font-size: 1.1rem;
            }
            .service-grid, .case-grid, .comments-grid, .step-grid, .training-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }