/* CSS reset and global vars */
        :root {
            --primary: #0d6efd; /* 科技深蓝 */
            --secondary: #ff6b35; /* 明艳撞色橙 */
            --accent: #7000ff; /* 霓虹亮紫 */
            --bg-light: #f8fafc;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
            --container-width: 1200px;
            --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            --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: var(--font-family);
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

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

        /* Typography */
        h1, h2, h3, h4, h5, h6 {
            color: var(--text-dark);
            font-weight: 700;
            line-height: 1.3;
        }

        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
            background-color: #ffffff;
        }

        section:nth-child(even) {
            background-color: var(--bg-light);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 8px;
            border: 2px solid transparent;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            text-align: center;
        }

        .btn-primary {
            background-color: var(--secondary);
            color: #ffffff;
        }

        .btn-primary:hover {
            background-color: #e0531e;
            transform: translateY(-2px);
        }

        .btn-secondary {
            background-color: var(--primary);
            color: #ffffff;
        }

        .btn-secondary:hover {
            background-color: #0b58ca;
            transform: translateY(-2px);
        }

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

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

        /* Header Navigation */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

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

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

        .ai-page-logo {
            height: 40px;
            width: auto;
        }

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

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 10px;
        }

        .nav-menu a {
            text-decoration: none;
            color: var(--text-dark);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }

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

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

        /* Mobile Menu Toggle */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--text-dark);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* Hero Section (No Image Allowed) */
        .hero {
            background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
            color: #ffffff;
            padding: 100px 0 120px;
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(13,110,253,0.15) 0%, transparent 60%);
            pointer-events: none;
        }

        .hero h1 {
            color: #ffffff;
            font-size: 3rem;
            max-width: 900px;
            margin: 0 auto 20px;
            line-height: 1.2;
        }

        .hero p {
            font-size: 1.25rem;
            color: #cbd5e1;
            max-width: 700px;
            margin: 0 auto 35px;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

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

        .section-header h2 {
            font-size: 2.2rem;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background-color: var(--secondary);
            margin: 10px auto 0;
            border-radius: 2px;
        }

        .section-header p {
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
        }

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

        .metric-card {
            background-color: #ffffff;
            padding: 30px 20px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            text-align: center;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .metric-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
        }

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

        .metric-label {
            font-size: 1rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* Platforms Tag Cloud & Grid */
        .platforms-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-top: 30px;
        }

        .platform-tag {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            padding: 10px 20px;
            border-radius: 30px;
            font-weight: 600;
            color: var(--text-dark);
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.02);
            transition: var(--transition);
        }

        .platform-tag:hover {
            border-color: var(--secondary);
            background-color: var(--secondary);
            color: #ffffff;
            transform: scale(1.05);
        }

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

        .service-card {
            background-color: #ffffff;
            padding: 40px 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
            border-color: var(--primary);
        }

        .service-icon {
            width: 60px;
            height: 60px;
            border-radius: 12px;
            background-color: rgba(13, 110, 253, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
            color: var(--primary);
            font-size: 1.8rem;
        }

        .service-card h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
        }

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

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

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

        .step-num {
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background-color: var(--secondary);
            color: #ffffff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            box-shadow: 0 4px 10px rgba(255, 107, 53, 0.3);
        }

        .flow-step h3 {
            margin-top: 15px;
            font-size: 1.15rem;
            margin-bottom: 10px;
        }

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

        /* Table Responsive */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
            background-color: #ffffff;
        }

        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: #f1f5f9;
            color: var(--text-dark);
            font-weight: 700;
        }

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

        .rating-star {
            color: #fbbf24;
            font-size: 1.2rem;
        }

        /* FAQ Accordion */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

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

        .faq-header {
            padding: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
            font-weight: 600;
        }

        .faq-icon {
            transition: transform 0.3s;
            font-size: 1.2rem;
        }

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

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

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

        .faq-item.active .faq-content {
            padding: 0 20px 20px;
            max-height: 300px;
        }

        /* Case Studies Grid */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .case-card {
            background-color: #ffffff;
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
            display: flex;
            flex-direction: column;
        }

        .case-image-wrapper {
            width: 100%;
            height: 240px;
            overflow: hidden;
            position: relative;
        }

        .case-image-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .case-card:hover .case-image-wrapper img {
            transform: scale(1.05);
        }

        .case-body {
            padding: 30px;
        }

        .case-tag {
            display: inline-block;
            padding: 4px 12px;
            background-color: rgba(255, 107, 53, 0.1);
            color: var(--secondary);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .case-body h3 {
            margin-bottom: 10px;
        }

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

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

        .feedback-card {
            background-color: #ffffff;
            padding: 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

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

        .feedback-user {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .feedback-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background-color: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--primary);
        }

        .feedback-info h4 {
            font-size: 1rem;
            margin-bottom: 2px;
        }

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

        /* Form section */
        .form-section-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: start;
        }

        .contact-info-panel {
            padding: 20px 0;
        }

        .contact-info-panel h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
        }

        .contact-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin-bottom: 30px;
        }

        .contact-list li {
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 1.05rem;
        }

        .contact-qr-box {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .qr-card {
            border: 1px solid var(--border-color);
            padding: 15px;
            background: #ffffff;
            border-radius: 8px;
            text-align: center;
        }

        .qr-card img {
            width: 120px;
            height: 120px;
            margin-bottom: 10px;
        }

        .form-card {
            background-color: #ffffff;
            padding: 40px;
            border-radius: 16px;
            box-shadow: 0 15px 30px rgba(0,0,0,0.05);
            border: 1px solid var(--border-color);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.95rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1.5px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
            font-family: inherit;
        }

        .form-control:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.15);
        }

        /* Article List & Tag cloud */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .article-card {
            background-color: #ffffff;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            padding: 25px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition);
        }

        .article-card:hover {
            border-color: var(--secondary);
            transform: translateY(-3px);
        }

        .article-title {
            font-size: 1.15rem;
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .article-title a {
            text-decoration: none;
            color: var(--text-dark);
            transition: var(--transition);
        }

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

        .article-meta {
            font-size: 0.85rem;
            color: var(--text-muted);
            display: flex;
            justify-content: space-between;
        }

        /* Search Diagnosis and Encyclopedia */
        .diag-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .dia-card, .ency-card {
            background: #ffffff;
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .step-timeline {
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin-top: 20px;
        }

        .timeline-item {
            position: relative;
            padding-left: 30px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 6px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--secondary);
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            left: 5px;
            top: 22px;
            width: 2px;
            height: calc(100% - 10px);
            background-color: var(--border-color);
        }

        .timeline-item:last-child::after {
            display: none;
        }

        .term-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .term-badge {
            background: #f1f5f9;
            color: var(--text-dark);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .term-badge:hover {
            background: var(--primary);
            color: #ffffff;
            border-color: var(--primary);
        }

        /* Footer */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px;
            font-size: 0.95rem;
            border-top: 3px solid var(--secondary);
        }

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

        .footer-col h4 {
            color: #ffffff;
            font-size: 1.1rem;
            margin-bottom: 20px;
        }

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

        .footer-col ul a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-col ul a:hover {
            color: #ffffff;
        }

        .friend-links-area {
            background-color: #1e293b;
            padding: 20px;
            border-radius: 8px;
            margin-top: 30px;
            border: 1px solid #334155;
        }

        .friend-links-area a {
            color: #cbd5e1;
            text-decoration: none;
            margin-right: 15px;
            font-size: 0.85rem;
            display: inline-block;
            transition: var(--transition);
        }

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

        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
        }

        /* Floating Contact widget */
        .floating-widget {
            position: fixed;
            right: 20px;
            bottom: 20px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-item {
            width: 50px;
            height: 50px;
            background-color: var(--secondary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            cursor: pointer;
            text-decoration: none;
            font-weight: bold;
            font-size: 0.85rem;
            transition: var(--transition);
            position: relative;
        }

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

        .float-item-tooltip {
            position: absolute;
            right: 60px;
            background-color: #ffffff;
            color: var(--text-dark);
            padding: 10px;
            border-radius: 8px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.15);
            border: 1px solid var(--border-color);
            display: none;
            width: 140px;
            text-align: center;
        }

        .float-item-tooltip img {
            width: 100px;
            height: 100px;
            margin-top: 5px;
        }

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

        /* Animations classes */
        .fade-in-section {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }

        .fade-in-section.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .services-grid, .article-grid, .feedback-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
                margin-top: -20px;
                padding: 0 20px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }
            .nav-menu {
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: #ffffff;
                flex-direction: column;
                padding: 20px;
                gap: 15px;
                border-bottom: 1px solid var(--border-color);
                display: none;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-actions {
                display: none;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1.05rem;
            }
            .flow-grid, .case-grid, .form-section-wrapper, .diag-wrapper {
                grid-template-columns: 1fr;
            }
            .services-grid, .article-grid, .feedback-grid {
                grid-template-columns: 1fr;
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .contact-qr-box {
                flex-direction: column;
                align-items: flex-start;
            }
        }