:root {
            --primary: #10b981;
            --primary-dark: #059669;
            --primary-light: #d1fae5;
            --secondary: #1f2937;
            --text-main: #1f2937;
            --text-muted: #4b5563;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --border-color: #e5e7eb;
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.6;
            overflow-x: hidden;
        }

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

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

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

        /* Header & Navigation */
        header {
            background-color: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary-dark);
        }

        .logo-area span {
            color: var(--secondary);
            margin-left: 5px;
        }

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

        .nav-links a {
            color: var(--text-muted);
            font-size: 0.95rem;
            font-weight: 500;
        }

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

        .nav-btn {
            background-color: var(--primary);
            color: white !important;
            padding: 8px 16px;
            border-radius: 6px;
            font-weight: 600;
        }

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

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

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

        /* Hero Section (No Images as requested) */
        .hero {
            background: linear-gradient(135deg, #f0fdf4 0%, #d1fae5 100%);
            padding: 100px 0 80px 0;
            text-align: center;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-badge {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary-dark);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 20px;
            border: 1px solid rgba(16, 185, 129, 0.2);
        }

        .hero h1 {
            font-size: 2.8rem;
            line-height: 1.25;
            color: var(--secondary);
            margin-bottom: 20px;
            font-weight: 800;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 35px auto;
        }

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

        .btn-primary {
            background-color: var(--primary);
            color: white;
            padding: 14px 28px;
            border-radius: 8px;
            font-size: 1.05rem;
            font-weight: 700;
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 6px -1px rgba(16, 185, 129, 0.2);
            transition: var(--transition);
        }

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

        .btn-secondary {
            background-color: var(--secondary);
            color: white;
            padding: 14px 28px;
            border-radius: 8px;
            font-size: 1.05rem;
            font-weight: 700;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-secondary:hover {
            background-color: #111827;
            transform: translateY(-2px);
        }

        /* Generic Section Styling */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .section-light {
            background-color: var(--bg-white);
        }

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

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

        .section-header h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background-color: var(--primary);
            margin: 10px auto 0 auto;
            border-radius: 2px;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 700px;
            margin: 0 auto;
        }

        /* Info Metrics (Data Cards) */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
        }

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

        .metric-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
            border-color: var(--primary);
        }

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

        .metric-label {
            font-size: 1rem;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 5px;
        }

        .metric-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* About Us & Platform Intro */
        .about-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.6rem;
            color: var(--secondary);
            margin-bottom: 20px;
        }

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

        .about-features {
            list-style: none;
            margin-top: 20px;
        }

        .about-features li {
            position: relative;
            padding-left: 30px;
            margin-bottom: 12px;
            font-weight: 500;
        }

        .about-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 0;
            color: var(--primary-dark);
            font-weight: 900;
            background-color: var(--primary-light);
            width: 20px;
            height: 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
        }

        .logo-container {
            display: flex;
            justify-content: center;
            align-items: center;
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 16px;
        }

        /* Service Cards */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 35px 25px;
            border-radius: 12px;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
            box-shadow: 0 10px 20px -5px rgba(16, 185, 129, 0.1);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-light);
            color: var(--primary-dark);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.25rem;
            color: var(--secondary);
            margin-bottom: 10px;
        }

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

        /* Model Tags Cloud */
        .model-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 30px;
        }

        .model-tag {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--secondary);
            transition: var(--transition);
        }

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

        /* Timeline / Steps */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
            position: relative;
        }

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

        .step-num {
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 35px;
            height: 35px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 4px 6px rgba(16, 185, 129, 0.2);
        }

        .step-item h3 {
            margin-top: 15px;
            font-size: 1.15rem;
            margin-bottom: 10px;
            color: var(--secondary);
        }

        .step-item p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Comparison Table */
        .table-responsive {
            overflow-x: auto;
            margin-top: 30px;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            background-color: var(--bg-white);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 0.95rem;
        }

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

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

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

        .rating-badge {
            background-color: #fef3c7;
            color: #d97706;
            padding: 4px 8px;
            border-radius: 4px;
            font-weight: 700;
            font-size: 0.85rem;
        }

        .success-text {
            color: var(--primary-dark);
            font-weight: 700;
        }

        /* Cases Grid */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

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

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 20px -5px rgba(0, 0, 0, 0.08);
            border-color: var(--primary);
        }

        .case-img-wrap {
            width: 100%;
            aspect-ratio: 16/9;
            overflow: hidden;
            background-color: #eaeaea;
        }

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

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

        .case-content {
            padding: 25px;
        }

        .case-tag {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary-dark);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
            margin-bottom: 12px;
        }

        .case-content h3 {
            font-size: 1.2rem;
            color: var(--secondary);
            margin-bottom: 10px;
        }

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

        /* Form Area */
        .form-section {
            background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
            color: white;
        }

        .form-section .section-header h2 {
            color: white;
        }

        .form-section .section-header p {
            color: #9ca3af;
        }

        .form-container {
            max-width: 700px;
            margin: 0 auto;
            background-color: rgba(255, 255, 255, 0.05);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        @media (max-width: 600px) {
            .form-grid {
                grid-template-columns: 1fr;
            }
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .form-group-full {
            grid-column: 1 / -1;
        }

        .form-label {
            font-size: 0.9rem;
            font-weight: 600;
            color: #d1d5db;
        }

        .form-input, .form-select, .form-textarea {
            background-color: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 8px;
            padding: 12px;
            color: white;
            font-size: 0.95rem;
            transition: var(--transition);
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--primary);
            background-color: rgba(255, 255, 255, 0.12);
        }

        .form-select option {
            background-color: #1f2937;
            color: white;
        }

        .submit-btn {
            width: 100%;
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 14px;
            border-radius: 8px;
            font-size: 1.05rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 10px;
        }

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

        /* FAQ Section (Accordion) */
        .faq-list {
            max-width: 850px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

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

        .faq-question {
            padding: 20px 25px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: var(--secondary);
            user-select: none;
        }

        .faq-icon {
            font-size: 1.2rem;
            font-weight: 300;
            transition: var(--transition);
        }

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

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

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

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            color: var(--primary);
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 20px 25px;
            border-top: 1px solid var(--border-color);
        }

        /* Reviews Grid */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

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

        .review-rating {
            color: #fbbf24;
            font-size: 1.1rem;
            margin-bottom: 15px;
        }

        .review-text {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            font-style: italic;
        }

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

        .review-avatar-text {
            width: 40px;
            height: 40px;
            background-color: var(--primary-light);
            color: var(--primary-dark);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .review-info h4 {
            font-size: 0.95rem;
            color: var(--secondary);
        }

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

        /* Articles & Resources */
        .articles-list {
            margin-top: 30px;
            display: flex;
            flex-direction: column;
            gap: 15px;
            max-width: 800px;
            margin: 30px auto 0 auto;
        }

        .article-item {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            transition: var(--transition);
        }

        .article-item:hover {
            border-color: var(--primary);
            transform: translateX(5px);
        }

        .article-info h3 {
            font-size: 1.1rem;
            color: var(--secondary);
            margin-bottom: 5px;
        }

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

        .article-link {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--primary-dark);
            white-space: nowrap;
        }

        /* Footer & Links */
        footer {
            background-color: var(--secondary);
            color: #9ca3af;
            padding: 60px 0 20px 0;
            border-top: 4px solid var(--primary);
        }

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

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        .footer-info h3 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }

        .footer-info p {
            margin-bottom: 15px;
            font-size: 0.9rem;
        }

        .footer-links-title {
            color: white;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

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

        .footer-links-list a {
            color: #9ca3af;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .footer-links-list a:hover {
            color: var(--primary);
            padding-left: 5px;
        }

        .footer-contact-item {
            margin-bottom: 15px;
            font-size: 0.9rem;
        }

        .footer-contact-item strong {
            color: white;
        }

        .footer-qr-grid {
            display: flex;
            gap: 20px;
            align-items: center;
            margin-top: 15px;
        }

        .footer-qr-card {
            text-align: center;
            font-size: 0.75rem;
            color: #9ca3af;
        }

        .footer-qr-card img {
            width: 80px;
            height: 80px;
            border-radius: 4px;
            margin-bottom: 5px;
            background-color: white;
            padding: 3px;
        }

        .friend-links {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 20px;
            font-size: 0.85rem;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }

        .friend-links a {
            color: #9ca3af;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
        }

        /* Floating Widgets */
        .floating-widgets {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            z-index: 999;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
            cursor: pointer;
            transition: var(--transition);
            position: relative;
        }

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

        .float-btn-wechat .qr-popup {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: white;
            border: 1px solid var(--border-color);
            padding: 10px;
            border-radius: 8px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            display: none;
            flex-direction: column;
            align-items: center;
            width: 140px;
        }

        .float-btn-wechat .qr-popup img {
            width: 120px;
            height: 120px;
            margin-bottom: 5px;
        }

        .float-btn-wechat .qr-popup span {
            color: var(--secondary);
            font-size: 0.75rem;
            font-weight: 700;
        }

        .float-btn-wechat:hover .qr-popup {
            display: flex;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .about-layout {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--bg-white);
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
                box-shadow: 0 10px 15px rgba(0, 0, 0, 0.05);
            }
            .nav-links.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
        }