/* Base Variables & Reset */
        :root {
            --primary: #10B981; /* Fresh emerald green */
            --primary-hover: #059669;
            --primary-light: #ECFDF5;
            --accent: #10B981;
            --text-main: #1F2937;
            --text-muted: #4B5563;
            --text-light: #9CA3AF;
            --bg-main: #FFFFFF;
            --bg-section: #F9FAFB;
            --bg-card: #FFFFFF;
            --border-color: #E5E7EB;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --radius: 8px;
            --radius-lg: 16px;
            --container-width: 1200px;
        }

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

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

        body {
            overflow-x: hidden;
            background-color: var(--bg-main);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        .section-padding {
            padding: 80px 0;
        }

        @media (max-width: 768px) {
            .section-padding {
                padding: 48px 0;
            }
        }

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

        .section-subtitle {
            display: inline-block;
            font-size: 14px;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 8px;
            padding: 4px 12px;
            background-color: var(--primary-light);
            border-radius: 50px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: #111827;
            margin-bottom: 16px;
        }

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

        /* Button Component */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 16px;
            font-weight: 600;
            border-radius: var(--radius);
            transition: all 0.2s ease;
            cursor: pointer;
            border: 2px solid transparent;
            text-align: center;
        }

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

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
        }

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

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

        /* Header Navigation */
        header {
            position: sticky;
            top: 0;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

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

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

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

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 24px;
            list-style: none;
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
        }

        .mobile-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-main);
            margin: 5px 0;
            transition: 0.3s;
        }

        @media (max-width: 1024px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: #FFFFFF;
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
            }

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

            .mobile-toggle {
                display: block;
            }

            .nav-actions {
                display: none;
            }
        }

        /* Hero Section (No Images allowed here) */
        .hero-section {
            background: linear-gradient(135deg, #ECFDF5 0%, #F0FDF4 50%, #FFFFFF 100%);
            padding: 100px 0 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-badge {
            background-color: rgba(16, 185, 129, 0.1);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 24px;
        }

        .hero-h1 {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.25;
            color: #111827;
            max-width: 800px;
            margin: 0 auto 24px auto;
        }

        .hero-p {
            font-size: 20px;
            color: var(--text-muted);
            max-width: 650px;
            margin: 0 auto 36px auto;
        }

        .hero-cta {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 48px;
        }

        .hero-features {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            border-top: 1px solid rgba(16, 185, 129, 0.15);
            padding-top: 36px;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero-feature-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
        }

        .hero-feature-item svg {
            width: 20px;
            height: 20px;
            color: var(--primary);
        }

        @media (max-width: 768px) {
            .hero-h1 {
                font-size: 32px;
            }
            .hero-p {
                font-size: 16px;
            }
            .hero-cta {
                flex-direction: column;
                align-items: center;
            }
            .hero-cta .btn {
                width: 100%;
                max-width: 300px;
            }
            .hero-features {
                gap: 20px;
            }
        }

        /* Stats Cards (数据指标卡片) */
        .stats-section {
            background-color: var(--bg-main);
            padding: 40px 0;
            margin-top: -30px;
            position: relative;
            z-index: 10;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .stat-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

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

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

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
        }

        @media (max-width: 992px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }

        /* About us Section */
        .about-section {
            background-color: var(--bg-section);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .about-content h3 {
            font-size: 24px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 16px;
        }

        .about-content p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 16px;
        }

        .about-points {
            list-style: none;
            margin-bottom: 24px;
        }

        .about-point-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 12px;
            font-size: 15px;
            color: var(--text-main);
        }

        .about-point-item svg {
            width: 20px;
            height: 20px;
            color: var(--primary);
            flex-shrink: 0;
            margin-top: 2px;
        }

        .about-media {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
        }

        .about-media img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            width: 100%;
            object-fit: cover;
        }

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

        /* Service Cards (服务能力) */
        .services-section {
            background-color: var(--bg-main);
        }

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

        .service-card {
            border: 1px solid var(--border-color);
            background-color: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px;
            transition: all 0.3s ease;
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }

        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius);
            background-color: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
        }

        .service-title {
            font-size: 20px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 12px;
        }

        .service-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

        .service-list {
            list-style: none;
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
        }

        .service-list-item {
            font-size: 13px;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 8px;
        }

        .service-list-item::before {
            content: "✓";
            color: var(--primary);
            font-weight: bold;
        }

        @media (max-width: 992px) {
            .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

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

        /* Model Aggregation Showcase */
        .models-section {
            background-color: var(--bg-section);
            overflow: hidden;
            position: relative;
        }

        .models-marquee-container {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 40px;
        }

        .models-marquee {
            display: flex;
            gap: 20px;
            animation: marquee 40s linear infinite;
            white-space: nowrap;
            width: max-content;
        }

        .models-marquee.reverse {
            animation: marquee-rev 40s linear infinite;
        }

        .model-tag {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 600;
            color: var(--text-main);
            box-shadow: var(--shadow-sm);
        }

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

        @keyframes marquee {
            0% { transform: translateX(0); }
            100% { transform: translateX(-50%); }
        }

        @keyframes marquee-rev {
            0% { transform: translateX(-50%); }
            100% { transform: translateX(0); }
        }

        /* Flow and Steps */
        .steps-section {
            background-color: var(--bg-main);
        }

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

        .step-card {
            position: relative;
            z-index: 2;
            background-color: var(--bg-card);
            padding: 32px 24px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            text-align: center;
        }

        .step-num {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--primary);
            color: #FFFFFF;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            margin-bottom: 20px;
        }

        .step-title {
            font-size: 18px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 12px;
        }

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

        @media (max-width: 992px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Solutions Section */
        .solutions-section {
            background-color: var(--bg-section);
        }

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

        .solution-card {
            background-color: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: all 0.3s ease;
        }

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

        .solution-info {
            padding: 24px;
        }

        .solution-industry {
            font-size: 12px;
            color: var(--primary);
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .solution-title {
            font-size: 20px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 12px;
        }

        .solution-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

        @media (max-width: 992px) {
            .solutions-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

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

        /* Network Section */
        .network-section {
            background-color: var(--bg-main);
        }

        .network-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .network-content h3 {
            font-size: 24px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 16px;
        }

        .network-content p {
            color: var(--text-muted);
            font-size: 16px;
            margin-bottom: 24px;
        }

        .network-regions {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .region-card {
            background-color: var(--bg-section);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 16px;
            text-align: center;
        }

        .region-name {
            font-weight: 700;
            color: #111827;
            margin-bottom: 4px;
        }

        .region-desc {
            font-size: 12px;
            color: var(--text-muted);
        }

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

        /* Standards & Training Section */
        .training-section {
            background-color: var(--bg-section);
        }

        .training-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .training-card {
            background-color: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .training-badge {
            align-self: flex-start;
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 6px 12px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .training-title {
            font-size: 22px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 16px;
        }

        .training-list {
            list-style: none;
            margin-bottom: 24px;
        }

        .training-item {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .training-item:last-child {
            border-bottom: none;
        }

        .training-item-name {
            font-weight: 600;
            color: var(--text-main);
        }

        .training-item-cert {
            font-size: 13px;
            color: var(--text-muted);
            background-color: var(--bg-section);
            padding: 2px 8px;
            border-radius: 4px;
        }

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

        /* Case Studies (案例展示) */
        .cases-section {
            background-color: var(--bg-main);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .case-card {
            background-color: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .case-image {
            width: 100%;
            height: 240px;
            object-fit: cover;
        }

        .case-body {
            padding: 28px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .case-meta {
            display: flex;
            gap: 12px;
            margin-bottom: 12px;
        }

        .case-tag {
            font-size: 12px;
            font-weight: 700;
            color: var(--primary);
            background-color: var(--primary-light);
            padding: 2px 8px;
            border-radius: 4px;
        }

        .case-title {
            font-size: 22px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 12px;
        }

        .case-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .case-result {
            background-color: var(--bg-section);
            border-radius: var(--radius);
            padding: 16px;
            font-size: 14px;
            color: var(--text-main);
            border-left: 4px solid var(--primary);
        }

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

        /* Comparison Table (对比评测) */
        .compare-section {
            background-color: var(--bg-section);
        }

        .rating-hero {
            background: linear-gradient(135deg, #111827 0%, #065F46 100%);
            color: #FFFFFF;
            border-radius: var(--radius-lg);
            padding: 40px;
            margin-bottom: 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 24px;
        }

        .rating-info {
            max-width: 600px;
        }

        .rating-title {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 8px;
        }

        .rating-stars {
            display: flex;
            align-items: center;
            gap: 4px;
            color: #FBBF24;
            font-size: 24px;
            margin-bottom: 12px;
        }

        .rating-num {
            font-size: 48px;
            font-weight: 800;
            color: #FFFFFF;
        }

        .rating-num span {
            font-size: 20px;
            color: var(--text-light);
        }

        .compare-table-wrapper {
            width: 100%;
            overflow-x: auto;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            background-color: var(--bg-card);
            box-shadow: var(--shadow-sm);
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }

        .compare-table th, .compare-table td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 15px;
        }

        .compare-table th {
            background-color: #F9FAFB;
            font-weight: 700;
            color: #111827;
        }

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

        .compare-table td.highlight {
            background-color: rgba(16, 185, 129, 0.03);
            font-weight: 600;
        }

        .icon-check {
            color: var(--primary);
            font-weight: bold;
        }

        .icon-cross {
            color: #EF4444;
            font-weight: bold;
        }

        /* Token Price list & Search */
        .token-section {
            background-color: var(--bg-main);
        }

        .token-table-wrapper {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

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

        .token-table th, .token-table td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
        }

        .token-table th {
            background-color: #F9FAFB;
            font-weight: 700;
            color: #111827;
        }

        .token-badge {
            background-color: #E5E7EB;
            color: #374151;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 500;
        }

        .token-badge.hot {
            background-color: var(--primary-light);
            color: var(--primary);
        }

        /* User Reviews (用户评论) */
        .reviews-section {
            background-color: var(--bg-section);
        }

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

        .review-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .review-text {
            font-size: 15px;
            color: var(--text-muted);
            margin-bottom: 24px;
            font-style: italic;
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 16px;
        }

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

        .review-user-info {
            display: flex;
            flex-direction: column;
        }

        .review-username {
            font-weight: 700;
            color: #111827;
            font-size: 15px;
        }

        .review-role {
            font-size: 13px;
            color: var(--text-light);
        }

        @media (max-width: 992px) {
            .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

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

        /* Terms & Trouble shoot (术语与排查) */
        .terms-section {
            background-color: var(--bg-main);
        }

        .terms-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .terms-block {
            background-color: var(--bg-section);
            border-radius: var(--radius-lg);
            padding: 32px;
        }

        .terms-block h3 {
            font-size: 20px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary);
        }

        .term-item {
            margin-bottom: 16px;
        }

        .term-title {
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 4px;
        }

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

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

        /* FAQ Accordion (常见用户问题) */
        .faq-section {
            background-color: var(--bg-section);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .faq-trigger {
            width: 100%;
            padding: 20px 24px;
            background: none;
            border: none;
            text-align: left;
            font-size: 16px;
            font-weight: 700;
            color: #111827;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-icon {
            font-size: 18px;
            transition: transform 0.3s;
            color: var(--primary);
        }

        .faq-panel {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }

        .faq-content {
            padding: 0 24px 20px 24px;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .faq-item.active .faq-panel {
            max-height: 500px;
        }

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

        /* Articles & Knowledgebase */
        .articles-section {
            background-color: var(--bg-main);
        }

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

        .article-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all 0.3s ease;
        }

        .article-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }

        .article-title {
            font-size: 18px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 12px;
        }

        .article-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .article-link {
            font-size: 14px;
            color: var(--primary);
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        @media (max-width: 992px) {
            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

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

        /* Contact & Form Section (联系我们 / 智能需求匹配) */
        .contact-section {
            background-color: var(--bg-section);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 48px;
        }

        .contact-info-panel {
            background: linear-gradient(135deg, #111827 0%, #064E3B 100%);
            color: #FFFFFF;
            padding: 40px;
            border-radius: var(--radius-lg);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .contact-info-head h3 {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 12px;
        }

        .contact-info-head p {
            color: var(--text-light);
            font-size: 15px;
        }

        .contact-details {
            margin: 40px 0;
        }

        .contact-detail-item {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 24px;
        }

        .contact-detail-icon {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }

        .contact-detail-text p {
            font-size: 13px;
            color: var(--text-light);
        }

        .contact-detail-text h4 {
            font-size: 16px;
            font-weight: 600;
        }

        .qr-codes {
            display: flex;
            gap: 24px;
        }

        .qr-item {
            text-align: center;
        }

        .qr-item img {
            width: 100px;
            height: 100px;
            border-radius: 8px;
            margin-bottom: 8px;
            border: 2px solid rgba(255, 255, 255, 0.2);
        }

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

        /* Form styling */
        .form-panel {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-sm);
        }

        .form-title {
            font-size: 22px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 24px;
        }

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

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

        .form-control {
            width: 100%;
            padding: 12px 16px;
            font-size: 15px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            outline: none;
            background-color: #FFFFFF;
            transition: all 0.3s;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
        }

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

        .form-submit-btn {
            width: 100%;
            padding: 14px;
            font-size: 16px;
        }

        @media (max-width: 992px) {
            .contact-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Footer */
        footer {
            background-color: #111827;
            color: #FFFFFF;
            padding: 60px 0 30px 0;
            border-top: 4px solid var(--primary);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            margin-bottom: 48px;
        }

        .footer-brand h4 {
            font-size: 20px;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--primary);
        }

        .footer-brand p {
            color: #9CA3AF;
            font-size: 14px;
            margin-bottom: 20px;
        }

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

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

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

        .footer-links-list a {
            color: #9CA3AF;
            font-size: 14px;
        }

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

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .friend-links a {
            color: #9CA3AF;
            font-size: 13px;
            background-color: #1F2937;
            padding: 4px 10px;
            border-radius: 4px;
        }

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

        .footer-bottom {
            padding-top: 30px;
            border-top: 1px solid #1F2937;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        .copyright {
            font-size: 13px;
            color: #9CA3AF;
        }

        .footer-actions {
            display: flex;
            gap: 16px;
        }

        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* Floating Widgets */
        .floating-widgets {
            position: fixed;
            right: 24px;
            bottom: 24px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            z-index: 999;
        }

        .floating-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background-color: #FFFFFF;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s;
            color: var(--text-main);
            position: relative;
        }

        .floating-btn:hover {
            background-color: var(--primary);
            color: #FFFFFF;
            border-color: var(--primary);
        }

        .floating-btn svg {
            width: 20px;
            height: 20px;
        }

        /* Tooltip on hover */
        .floating-btn .tooltip {
            position: absolute;
            right: 60px;
            background-color: #111827;
            color: #FFFFFF;
            padding: 8px 12px;
            border-radius: var(--radius);
            font-size: 12px;
            white-space: nowrap;
            opacity: 0;
            visibility: hidden;
            transition: 0.3s;
        }

        .floating-btn:hover .tooltip {
            opacity: 1;
            visibility: visible;
        }

        .wechat-popup {
            position: absolute;
            bottom: 60px;
            right: 0;
            background-color: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 16px;
            box-shadow: var(--shadow-lg);
            display: none;
            text-align: center;
            width: 160px;
        }

        .wechat-popup img {
            width: 120px;
            height: 120px;
            margin-bottom: 8px;
        }

        .wechat-popup span {
            font-size: 12px;
            color: var(--text-muted);
        }

        .floating-btn.wechat-btn:hover .wechat-popup {
            display: block;
        }

        /* Animation utilities */
        .reveal {
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.6s ease-out;
        }

        .reveal.active {
            opacity: 1;
            transform: translateY(0);
        }