/* CSS Reset & Variables - 高亮度鲜活风 */
        :root {
            --primary: #0052d9;
            --primary-hover: #003cab;
            --secondary: #00a870;
            --accent: #ff9900;
            --bg-light: #f7f9fc;
            --bg-white: #ffffff;
            --text-dark: #1d2129;
            --text-muted: #4e5969;
            --text-light: #86909c;
            --border-color: #e5e6eb;
            --shadow-sm: 0 2px 8px rgba(0, 82, 217, 0.05);
            --shadow-md: 0 8px 24px rgba(0, 82, 217, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 82, 217, 0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-dark);
            background-color: var(--bg-light);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

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

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

        section:nth-of-type(even) {
            background-color: var(--bg-white);
        }

        /* Typography */
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.3;
        }

        h2 {
            font-size: 2.2rem;
            text-align: center;
            margin-bottom: 16px;
            color: var(--text-dark);
        }

        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto 50px auto;
        }

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

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

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
        }

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

        .btn-primary:hover {
            background-color: var(--primary-hover);
            color: var(--bg-white);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 82, 217, 0.3);
        }

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

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

        /* Navigation */
        .header {
            position: sticky;
            top: 0;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-sm);
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
        }

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

        .logo-wrap {
            display: flex;
            align-items: center;
            height: 100%;
        }

        .ai-page-logo {
            height: 40px;
            object-fit: contain;
        }

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

        .nav-link {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-weight: 500;
            padding: 8px 12px;
        }

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

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

        .hamburger {
            display: none;
            cursor: pointer;
            background: none;
            border: none;
            outline: none;
        }

        .hamburger span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--text-dark);
            margin: 5px 0;
            transition: var(--transition);
        }

        /* Hero Section (No Images Allowed) */
        .hero {
            background: linear-gradient(135deg, #e0f2fe 0%, #eff6ff 50%, #f0fdf4 100%);
            padding: 120px 0 100px 0;
            text-align: center;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-tag {
            display: inline-block;
            background-color: rgba(0, 82, 217, 0.1);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero h1 {
            font-size: 3rem;
            color: var(--text-dark);
            margin-bottom: 24px;
            letter-spacing: -0.5px;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 40px auto;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 50px;
        }

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        /* Stats Cards in Hero */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            max-width: 900px;
            margin: 0 auto;
        }

        .stat-card {
            background: var(--bg-white);
            padding: 24px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

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

        .stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
        }

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

        /* About Section */
        .about-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-features {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 30px;
        }

        .about-feature-item {
            display: flex;
            gap: 16px;
        }

        .feature-icon-box {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            background-color: rgba(0, 168, 112, 0.1);
            color: var(--secondary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        .feature-text h4 {
            font-size: 1.1rem;
            margin-bottom: 6px;
        }

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

        /* Grid Services */
        .service-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 30px;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }

        .service-card h3 {
            font-size: 1.3rem;
            margin: 20px 0 12px 0;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }

        .service-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tag-badge {
            background-color: var(--bg-light);
            color: var(--text-muted);
            font-size: 0.8rem;
            padding: 4px 10px;
            border-radius: 4px;
        }

        /* Model Badge Cloud */
        .model-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            max-width: 1000px;
            margin: 0 auto;
        }

        .model-badge {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 30px;
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--text-muted);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .model-badge:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: scale(1.05);
        }

        /* Solutions Grid */
        .sol-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .sol-card {
            background-color: var(--bg-light);
            border-radius: var(--radius-md);
            padding: 30px;
            transition: var(--transition);
        }

        .sol-card:hover {
            background-color: var(--bg-white);
            box-shadow: var(--shadow-md);
            transform: translateY(-5px);
        }

        /* Workflow Step */
        .step-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-item {
            position: relative;
            background: var(--bg-white);
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }

        .step-num {
            position: absolute;
            top: -20px;
            left: 24px;
            width: 40px;
            height: 40px;
            background-color: var(--primary);
            color: var(--bg-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            box-shadow: 0 4px 10px rgba(0, 82, 217, 0.3);
        }

        .step-item h3 {
            margin: 20px 0 10px 0;
            font-size: 1.15rem;
        }

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

        /* Tech Standards Table */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background-color: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            margin-top: 30px;
        }

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

        th, td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border-color);
        }

        th {
            background-color: rgba(0, 82, 217, 0.03);
            color: var(--text-dark);
            font-weight: 600;
        }

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

        /* Image Display Grid */
        .image-showcase {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 40px;
        }

        .showcase-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }

        .showcase-item img {
            width: 100%;
            display: block;
            object-fit: cover;
            transition: var(--transition);
        }

        .showcase-item:hover img {
            transform: scale(1.03);
        }

        .showcase-info {
            padding: 20px;
        }

        .showcase-info h4 {
            margin-bottom: 8px;
            font-size: 1.1rem;
        }

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

        /* Evaluation Table Card */
        .eval-card {
            background-color: var(--bg-white);
            border: 2px solid var(--primary);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-lg);
        }

        .eval-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 24px;
            margin-bottom: 24px;
            flex-wrap: wrap;
            gap: 20px;
        }

        .eval-score-box {
            text-align: right;
        }

        .eval-stars {
            color: var(--accent);
            font-size: 1.4rem;
            margin-bottom: 4px;
        }

        .eval-score {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
        }

        .eval-max {
            font-size: 1rem;
            color: var(--text-light);
            font-weight: 400;
        }

        /* Forms */
        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: start;
        }

        .form-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 40px;
            box-shadow: var(--shadow-md);
        }

        .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 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            outline: none;
            transition: var(--transition);
            font-family: inherit;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.15);
        }

        select.form-control {
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234e5969' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 16px center;
            background-size: 16px;
        }

        /* FAQ Accordion */
        .faq-list {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

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

        .faq-header-btn {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            background: none;
            border: none;
            text-align: left;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            color: var(--text-dark);
            outline: none;
            transition: var(--transition);
        }

        .faq-header-btn:hover {
            color: var(--primary);
        }

        .faq-icon-arrow {
            transition: transform 0.3s;
            flex-shrink: 0;
            width: 16px;
            height: 16px;
        }

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

        .faq-content {
            padding: 20px 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            border-top: 1px solid var(--border-color);
        }

        .faq-item.active .faq-body {
            max-height: 300px;
        }

        .faq-item.active .faq-icon-arrow {
            transform: rotate(180deg);
        }

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

        .comment-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

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

        .comment-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
        }

        .user-avatar-text {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: rgba(0, 82, 217, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.1rem;
        }

        .user-info h5 {
            font-size: 1rem;
            margin-bottom: 2px;
        }

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

        .comment-content {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        /* Article List & Footer Links */
        .article-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .article-list li {
            border-bottom: 1px dashed var(--border-color);
            padding-bottom: 12px;
        }

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

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

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

        /* Footer */
        .footer {
            background-color: #0e121a;
            color: #a3b1c6;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
            border-top: 1px solid #1a2233;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--bg-white);
            margin-bottom: 20px;
            font-size: 1rem;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: #a3b1c6;
        }

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

        .footer-bottom {
            border-top: 1px solid #1a2233;
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

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

        .friend-links a {
            color: #6c7d93;
            font-size: 0.85rem;
        }

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

        /* Floating Contact Widget */
        .floating-contact {
            position: fixed;
            right: 20px;
            bottom: 40px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-item {
            width: 50px;
            height: 50px;
            background-color: var(--bg-white);
            color: var(--text-dark);
            border-radius: 50%;
            box-shadow: var(--shadow-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            border: 1px solid var(--border-color);
        }

        .float-item:hover {
            background-color: var(--primary);
            color: var(--bg-white);
            transform: scale(1.08);
        }

        .float-qr {
            position: absolute;
            bottom: 0;
            right: 60px;
            background-color: var(--bg-white);
            padding: 16px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-lg);
            display: none;
            text-align: center;
            width: 160px;
            border: 1px solid var(--border-color);
        }

        .float-qr img {
            width: 120px;
            height: 120px;
            object-fit: cover;
            margin-bottom: 8px;
        }

        .float-qr p {
            color: var(--text-dark);
            font-size: 0.8rem;
            margin: 0;
        }

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

        /* Map Network Graphic */
        .network-wrap {
            background-color: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 40px;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }

        .network-nodes {
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 30px;
        }

        .node-item {
            background-color: var(--bg-light);
            padding: 12px 24px;
            border-radius: 50px;
            font-weight: 600;
            color: var(--primary);
            border: 1px solid var(--border-color);
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            h2 { font-size: 1.8rem; }
            .about-wrap, .form-grid { grid-template-columns: 1fr; }
            .sol-grid { grid-template-columns: repeat(2, 1fr); }
            .step-timeline { grid-template-columns: repeat(2, 1fr); gap: 30px; }
            .comment-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--bg-white);
                border-top: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                padding: 20px;
                gap: 15px;
            }

            .nav-menu.active {
                display: flex;
            }

            .hamburger {
                display: block;
            }

            .hero h1 { font-size: 2.2rem; }
            .sol-grid, .step-timeline, .comment-grid, .stats-grid, .image-showcase { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .nav-btn-wrap { display: none; }
        }