/* CSS reset & variables */
        :root {
            --bg-primary: #f8fafc;
            --bg-secondary: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-light: #64748b;
            --neon-green: #10b981;
            --neon-blue: #3b82f6;
            --neon-purple: #8b5cf6;
            --border-color: #e2e8f0;
            --glow-green: rgba(16, 185, 129, 0.15);
            --glow-blue: rgba(59, 130, 246, 0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }

        * {
            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;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        /* Common layout elements */
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

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

        /* 炫彩荧光风 渐变与强调 */
        .gradient-text {
            background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple), var(--neon-green));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 800;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 16px;
            font-weight: 600;
            border-radius: 8px;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border: none;
        }

        .btn-glow-green {
            background: linear-gradient(135deg, #10b981, #059669);
            color: #ffffff;
            box-shadow: 0 4px 14px var(--glow-green);
        }
        .btn-glow-green:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(16, 185, 129, 0.3);
        }

        .btn-glow-blue {
            background: linear-gradient(135deg, #3b82f6, #2563eb);
            color: #ffffff;
            box-shadow: 0 4px 14px var(--glow-blue);
        }
        .btn-glow-blue:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3);
        }

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

        /* Header & Navigation */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background-color: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: var(--transition);
        }

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

        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: var(--text-primary);
        }

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

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

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

        .nav-link {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
        }

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

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

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

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--text-primary);
            transition: var(--transition);
        }

        /* Hero Section (No Image) */
        .hero {
            padding-top: 140px;
            padding-bottom: 80px;
            background: radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.05) 0%, rgba(139, 92, 246, 0.05) 90%);
            text-align: center;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(59, 130, 246, 0.1);
            color: var(--neon-blue);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
            border: 1px solid rgba(59, 130, 246, 0.2);
        }

        h1.hero-title {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
            max-width: 900px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-desc {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 700px;
            margin: 0 auto 36px;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

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

        .section-tag {
            font-size: 14px;
            font-weight: 700;
            color: var(--neon-green);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 10px;
            display: block;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 15px;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }

        /* Stat Cards */
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: -30px;
            position: relative;
            z-index: 10;
        }

        .stat-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            text-align: center;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            border-color: var(--neon-green);
            box-shadow: 0 10px 20px var(--glow-green);
        }

        .stat-num {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-light);
        }

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

        .feature-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 32px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(to bottom, var(--neon-blue), var(--neon-purple));
            opacity: 0;
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.08);
            border-color: rgba(139, 92, 246, 0.3);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .card-icon {
            font-size: 40px;
            margin-bottom: 20px;
            display: inline-block;
        }

        .card-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .card-desc {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.6;
        }

        /* Steps Block */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .step-item {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            position: relative;
        }

        .step-num {
            position: absolute;
            top: -15px;
            left: 20px;
            background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
            color: #fff;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
        }

        .step-title {
            font-size: 18px;
            font-weight: 700;
            margin-top: 10px;
            margin-bottom: 8px;
        }

        .step-desc {
            font-size: 14px;
            color: var(--text-secondary);
        }

        /* Solutions Layout */
        .solutions-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .solutions-content {
            padding-right: 20px;
        }

        .solutions-list {
            list-style: none;
            margin-top: 24px;
        }

        .solutions-list li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 16px;
            font-size: 16px;
            color: var(--text-secondary);
        }

        .solutions-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 0;
            color: var(--neon-green);
            font-weight: 900;
            font-size: 18px;
        }

        .solutions-img-wrap {
            position: relative;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }

        .solutions-img-wrap img {
            width: 100%;
            display: block;
            object-fit: cover;
        }

        /* Network Section */
        .network-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
            align-items: center;
        }

        .map-mockup {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .network-bar {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .network-bar-label {
            width: 100px;
            font-size: 14px;
            font-weight: 600;
        }

        .network-bar-track {
            flex-grow: 1;
            height: 8px;
            background-color: var(--border-color);
            border-radius: 10px;
            overflow: hidden;
        }

        .network-bar-fill {
            height: 100%;
            background: linear-gradient(to right, var(--neon-blue), var(--neon-green));
            border-radius: 10px;
        }

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

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

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

        .comparision-table th {
            background-color: #f1f5f9;
            font-weight: 700;
            color: var(--text-primary);
        }

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

        .rating-badge {
            background: linear-gradient(135deg, #f59e0b, #d97706);
            color: #fff;
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 13px;
            font-weight: 700;
        }

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

        .review-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.03);
        }

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

        .review-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 16px;
        }

        .review-meta h4 {
            font-size: 16px;
            font-weight: 700;
        }

        .review-meta span {
            font-size: 12px;
            color: var(--text-light);
        }

        .review-text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* FAQ Accordion */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            width: 100%;
            padding: 20px 24px;
            text-align: left;
            background: none;
            border: none;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-question::after {
            content: '+';
            font-size: 20px;
            color: var(--text-light);
            transition: var(--transition);
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background-color: #fafbfc;
        }

        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

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

        .form-info {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .contact-item {
            display: flex;
            gap: 16px;
            align-items: center;
        }

        .contact-icon {
            width: 48px;
            height: 48px;
            background: rgba(59, 130, 246, 0.1);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--neon-blue);
            font-size: 20px;
        }

        .contact-detail h4 {
            font-size: 16px;
            font-weight: 700;
        }

        .contact-detail p {
            font-size: 14px;
            color: var(--text-secondary);
        }

        .booking-form {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

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

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 15px;
            color: var(--text-primary);
            transition: var(--transition);
            background-color: #f8fafc;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--neon-blue);
            background-color: #fff;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        /* Media grid */
        .media-grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .media-card {
            border-radius: 16px;
            overflow: hidden;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
        }

        .media-card img {
            width: 100%;
            height: auto;
            display: block;
        }

        .media-body {
            padding: 24px;
        }

        .media-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .media-desc {
            font-size: 14px;
            color: var(--text-secondary);
        }

        /* Tag cloud / Training / Terms */
        .tags-container {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }

        .tag-pill {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 14px;
            transition: var(--transition);
            cursor: default;
        }

        .tag-pill:hover {
            border-color: var(--neon-purple);
            color: var(--neon-purple);
            transform: translateY(-2px);
        }

        /* Footer */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand p {
            margin-top: 15px;
            line-height: 1.6;
        }

        .footer-title {
            color: #f8fafc;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }

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

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a, .ai-page-home-link {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover, .ai-page-home-link:hover {
            color: #ffffff;
        }

        .footer-qrcode {
            max-width: 120px;
            border-radius: 8px;
            margin-bottom: 10px;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            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;
        }

        .friend-links a {
            color: #64748b;
            text-decoration: none;
            transition: var(--transition);
        }

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

        /* Float Customer Service */
        .float-cs {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--bg-secondary);
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid var(--border-color);
            position: relative;
        }

        .float-btn:hover {
            transform: translateY(-3px);
            border-color: var(--neon-blue);
        }

        .float-qrcode-hover {
            position: absolute;
            bottom: 60px;
            right: 0;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 12px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            display: none;
            width: 140px;
            text-align: center;
        }

        .float-qrcode-hover img {
            width: 100%;
            height: auto;
            border-radius: 4px;
            margin-bottom: 6px;
        }

        .float-qrcode-hover span {
            font-size: 11px;
            color: var(--text-secondary);
            display: block;
        }

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

        /* Back to top */
        #back-to-top {
            display: none;
            background-color: var(--text-primary);
            color: #fff;
        }

        /* Responsive design */
        @media (max-width: 1024px) {
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
                margin-top: 0;
            }
            .card-grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-container {
                grid-template-columns: repeat(2, 1fr);
            }
            .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            section {
                padding: 60px 0;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: var(--bg-secondary);
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            h1.hero-title {
                font-size: 2rem;
            }
            .solutions-grid, .network-grid, .form-grid, .media-grid-2 {
                grid-template-columns: 1fr;
            }
            .card-grid-3, .steps-container, .review-grid, .stat-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }