:root {
            --primary: #0052cc;
            --primary-hover: #004099;
            --accent: #00c2ff;
            --text-dark: #0f172a;
            --text-light: #64748b;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --border-color: #e2e8f0;
            --success: #10b981;
            --warning: #f59e0b;
        }

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

        body {
            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;
            overflow-x: hidden;
        }

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

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

        /* Container System */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

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

        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 15px;
            color: var(--text-dark);
            font-weight: 700;
        }

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

        /* Header Navigation */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            transition: all 0.3s ease;
        }

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

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

        .logo-area img {
            max-height: 40px;
            width: auto;
        }

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

        .nav-link {
            font-size: 0.95rem;
            color: var(--text-dark);
            font-weight: 500;
            transition: color 0.3s;
        }

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

        .nav-btn {
            background-color: var(--primary);
            color: white;
            padding: 8px 20px;
            border-radius: 6px;
            font-weight: 600;
            transition: background 0.3s;
        }

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

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

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--text-dark);
            border-radius: 2px;
            transition: 0.3s;
        }

        /* Hero Section (No Image) */
        .hero {
            background: linear-gradient(135deg, #021535 0%, #002c77 50%, #0052cc 100%);
            color: white;
            padding-top: 150px;
            padding-bottom: 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 80% 20%, rgba(0, 194, 255, 0.15) 0%, transparent 50%);
            pointer-events: none;
        }

        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 20px;
            background: linear-gradient(to right, #ffffff, #00c2ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 35px;
            color: #cbd5e1;
        }

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

        .btn-primary {
            background: linear-gradient(to right, #00c2ff, #0052cc);
            color: white;
            font-weight: 700;
            padding: 14px 35px;
            border-radius: 8px;
            transition: transform 0.2s, box-shadow 0.2s;
            box-shadow: 0 4px 15px rgba(0, 194, 255, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 194, 255, 0.6);
            color: white;
        }

        .btn-secondary {
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            font-weight: 600;
            padding: 14px 35px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.3s;
        }

        .btn-secondary:hover {
            background-color: rgba(255, 255, 255, 0.2);
            color: white;
        }

        /* Stats Cards (No Image) */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 30px;
        }

        .stat-card {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 25px;
            border-radius: 10px;
            text-align: center;
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            color: #00c2ff;
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: #94a3b8;
        }

        /* About & Platform */
        .about-section {
            background-color: var(--bg-white);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

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

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

        .feature-bullets {
            list-style: none;
            margin-top: 20px;
        }

        .feature-bullets li {
            position: relative;
            padding-left: 25px;
            margin-bottom: 10px;
            color: var(--text-dark);
            font-weight: 500;
        }

        .feature-bullets li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--success);
            font-weight: bold;
        }

        /* Model Tags Cloud */
        .model-cloud-container {
            background: var(--bg-light);
            border-radius: 12px;
            padding: 30px;
            box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.05);
        }

        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }

        .model-tag {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            color: var(--text-dark);
            font-weight: 500;
            transition: all 0.3s;
        }

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

        /* Service Cards */
        .services-section {
            background-color: var(--bg-light);
        }

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

        .service-card {
            background-color: var(--bg-white);
            border-radius: 12px;
            padding: 35px;
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .service-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background-color: var(--primary);
            transform: scaleY(0);
            transition: transform 0.3s;
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 30px rgba(0, 82, 204, 0.08);
        }

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

        .service-icon {
            font-size: 2rem;
            margin-bottom: 20px;
            color: var(--primary);
        }

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

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

        /* Flow & Timeline */
        .process-section {
            background-color: var(--bg-white);
        }

        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
        }

        .timeline::after {
            content: '';
            position: absolute;
            width: 4px;
            background-color: var(--border-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -2px;
        }

        .timeline-item {
            padding: 10px 40px;
            position: relative;
            background-color: inherit;
            width: 50%;
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background-color: white;
            border: 4px solid var(--primary);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }

        .left {
            left: 0;
        }

        .right {
            left: 50%;
        }

        .right::after {
            left: -10px;
        }

        .timeline-content {
            padding: 20px 30px;
            background-color: var(--bg-light);
            position: relative;
            border-radius: 8px;
            border: 1px solid var(--border-color);
        }

        .timeline-content h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: var(--primary);
        }

        /* Comparison Table & Token Pricing */
        .compare-section {
            background-color: var(--bg-light);
        }

        .table-responsive {
            overflow-x: auto;
            background-color: var(--bg-white);
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 12px rgba(0,0,0,0.02);
            margin-bottom: 40px;
        }

        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: 600;
        }

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

        .recommend-badge {
            background-color: var(--primary);
            color: white;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: bold;
            display: inline-block;
        }

        /* Ratings Panel */
        .rating-box {
            background: linear-gradient(135deg, #0052cc, #00c2ff);
            color: white;
            padding: 30px;
            border-radius: 12px;
            text-align: center;
            max-width: 600px;
            margin: 0 auto 50px;
        }

        .rating-num {
            font-size: 4rem;
            font-weight: 800;
            line-height: 1;
        }

        .rating-stars {
            color: #fbbf24;
            font-size: 1.8rem;
            margin: 10px 0;
        }

        /* Training Program */
        .training-section {
            background-color: var(--bg-white);
        }

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

        .training-card {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            transition: all 0.3s;
        }

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

        .training-card h3 {
            font-size: 1rem;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .training-card p {
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* Case & Media center */
        .case-section {
            background-color: var(--bg-light);
        }

        .case-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 25px;
        }

        .case-card {
            background-color: var(--bg-white);
            border-radius: 10px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .case-img-wrap {
            position: relative;
            overflow: hidden;
            background-color: #f1f5f9;
        }

        .case-img-wrap img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            transition: transform 0.3s;
        }

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

        .case-info {
            padding: 20px;
        }

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

        .case-info p {
            color: var(--text-light);
            font-size: 0.88rem;
        }

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

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

        .review-card {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 25px;
            border-radius: 10px;
            position: relative;
        }

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

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

        .user-info h5 {
            font-size: 0.95rem;
            color: var(--text-dark);
        }

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

        /* Knowledge Base Section */
        .knowledge-section {
            background-color: var(--bg-light);
        }

        .knowledge-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 30px;
        }

        .articles-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .article-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 8px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all 0.3s;
        }

        .article-item:hover {
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(0,0,0,0.03);
        }

        .article-item h4 {
            font-size: 1.1rem;
            margin-bottom: 10px;
        }

        .article-item a {
            font-weight: 500;
            display: inline-block;
            margin-top: 10px;
        }

        .encyclopedia-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 25px;
            border-radius: 8px;
        }

        .encyclopedia-card h3 {
            font-size: 1.25rem;
            margin-bottom: 15px;
            border-bottom: 2px solid var(--primary);
            padding-bottom: 8px;
        }

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

        .term-list li {
            margin-bottom: 12px;
            font-size: 0.9rem;
        }

        .term-list strong {
            color: var(--primary);
            display: block;
        }

        /* FAQ Section (Accordion) */
        .faq-section {
            background-color: var(--bg-white);
        }

        .faq-list {
            max-width: 850px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

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

        .faq-question {
            padding: 18px 25px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: var(--bg-light);
            transition: background 0.3s;
            user-select: none;
        }

        .faq-question:hover {
            background-color: #f1f5f9;
        }

        .faq-answer {
            padding: 0 25px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            background-color: var(--bg-white);
            color: var(--text-light);
            font-size: 0.95rem;
            border-top: 0 solid var(--border-color);
        }

        .faq-item.active .faq-answer {
            padding: 18px 25px;
            max-height: 500px;
            border-top: 1px solid var(--border-color);
        }

        .faq-question::after {
            content: '+';
            font-size: 1.4rem;
            color: var(--primary);
            transition: transform 0.3s;
        }

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

        /* Form & Contact (SubmitForm) */
        .contact-section {
            background-color: var(--bg-light);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
        }

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

        .contact-info-card h3 {
            font-size: 1.5rem;
            margin-bottom: 25px;
            color: var(--primary);
        }

        .contact-method {
            margin-bottom: 20px;
        }

        .contact-method strong {
            display: block;
            font-size: 0.9rem;
            color: var(--text-light);
        }

        .contact-method span {
            font-size: 1.1rem;
            color: var(--text-dark);
            font-weight: 500;
        }

        .qrcode-box {
            margin-top: 25px;
            display: flex;
            align-items: center;
            gap: 20px;
            border-top: 1px dashed var(--border-color);
            padding-top: 20px;
        }

        .qrcode-box img {
            width: 100px;
            height: 100px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
        }

        .qrcode-info p {
            font-size: 0.85rem;
            color: var(--text-light);
        }

        .form-card {
            background-color: var(--bg-white);
            padding: 40px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 30px rgba(0, 82, 204, 0.03);
        }

        .form-card h3 {
            margin-bottom: 20px;
            font-size: 1.5rem;
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            font-size: 0.9rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }

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

        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }

        .submit-btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 14px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            width: 100%;
            transition: background 0.3s;
        }

        .submit-btn:hover {
            background-color: var(--primary-hover);
        }

        /* Footer & Links */
        footer {
            background-color: #0b1329;
            color: #94a3b8;
            padding: 60px 0 20px;
            font-size: 0.9rem;
            border-top: 2px solid var(--primary);
        }

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

        .footer-logo img {
            max-height: 40px;
            margin-bottom: 15px;
        }

        .footer-logo p {
            line-height: 1.7;
        }

        .footer-links h4 {
            color: white;
            margin-bottom: 15px;
            font-size: 1rem;
        }

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

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

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

        .footer-links ul li a:hover {
            color: white;
        }

        .friend-links {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #1e293b;
        }

        .friend-links h4 {
            color: white;
            font-size: 0.9rem;
            margin-bottom: 10px;
        }

        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }

        .friend-links-list a {
            color: #64748b;
            font-size: 0.85rem;
        }

        .friend-links-list a:hover {
            color: white;
        }

        .footer-bottom {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #1e293b;
            text-align: center;
            font-size: 0.8rem;
        }

        /* Floating Widgets */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            background-color: var(--primary);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            transition: all 0.3s;
            position: relative;
        }

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

        .float-btn .popover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background-color: white;
            color: var(--text-dark);
            border: 1px solid var(--border-color);
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            display: none;
            width: 220px;
            text-align: center;
        }

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

        .float-btn .popover img {
            width: 150px;
            height: 150px;
            margin-bottom: 8px;
        }

        /* Responsive Styles */
        @media (max-width: 1024px) {
            .services-grid, .case-grid, .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .training-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            section {
                padding: 50px 0;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: var(--bg-white);
                padding: 20px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .nav-menu.show {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .about-grid, .contact-grid, .knowledge-grid {
                grid-template-columns: 1fr;
            }
            .services-grid, .case-grid, .reviews-grid {
                grid-template-columns: 1fr;
            }
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item.right {
                left: 0;
            }
            .timeline-item::after {
                left: 21px;
            }
            .training-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }