:root {
            --primary: #0066ff;
            --primary-light: #00f2fe;
            --secondary: #00d2ff;
            --dark: #0f172a;
            --gray-text: #475569;
            --light-bg: #f8fafc;
            --white: #ffffff;
            --card-shadow: 0 10px 30px rgba(0, 102, 255, 0.05);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--light-bg);
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 统一容器 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
            z-index: 1000;
            transition: var(--transition);
        }

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

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

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

        .brand-name {
            font-size: 1.25rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

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

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

        .nav-btn {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: var(--white) !important;
            padding: 8px 18px;
            border-radius: 50px;
            font-weight: 600;
            box-shadow: 0 4px 15px rgba(0, 102, 255, 0.2);
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.3);
        }

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

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

        /* 首屏 Hero (无图) */
        .hero-section {
            padding: 160px 0 100px 0;
            background: radial-gradient(circle at 80% 20%, rgba(0, 242, 254, 0.15) 0%, transparent 50%),
                        radial-gradient(circle at 10% 80%, rgba(0, 102, 255, 0.08) 0%, transparent 50%),
                        var(--white);
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .hero-content {
            max-width: 850px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(0, 102, 255, 0.08);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 24px;
            border: 1px solid rgba(0, 102, 255, 0.15);
        }

        .hero-title {
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 800;
            line-height: 1.25;
            color: var(--dark);
            margin-bottom: 24px;
        }

        .hero-title span {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-subtitle {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: var(--gray-text);
            margin-bottom: 40px;
            max-width: 650px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .btn-primary {
            display: inline-block;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: var(--white);
            padding: 14px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            box-shadow: 0 8px 24px rgba(0, 102, 255, 0.25);
            transition: var(--transition);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(0, 102, 255, 0.35);
        }

        .btn-secondary {
            display: inline-block;
            background: var(--white);
            color: var(--dark);
            border: 1px solid rgba(0, 0, 0, 0.1);
            padding: 14px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            transition: var(--transition);
        }

        .btn-secondary:hover {
            background: var(--light-bg);
            border-color: rgba(0, 0, 0, 0.2);
            transform: translateY(-2px);
        }

        /* 标签与特性墙 */
        .hero-tags {
            margin-top: 50px;
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .hero-tag-item {
            background: rgba(255, 255, 255, 0.8);
            border: 1px solid rgba(0, 0, 0, 0.05);
            padding: 6px 14px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--gray-text);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
        }

        /* 通用区块排版 */
        section {
            padding: 80px 0;
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 50px auto;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 16px;
        }

        .section-subtitle {
            color: var(--gray-text);
            font-size: 1.05rem;
        }

        /* 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            margin-top: -40px;
            position: relative;
            z-index: 10;
        }

        .stat-card {
            background: var(--white);
            padding: 30px 24px;
            border-radius: 12px;
            text-align: center;
            box-shadow: var(--card-shadow);
            border: 1px solid rgba(0, 102, 255, 0.05);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 8px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--gray-text);
            font-weight: 500;
        }

        /* 关于我们 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 18px;
        }

        .about-text p {
            color: var(--gray-text);
            margin-bottom: 20px;
            font-size: 1rem;
        }

        .about-image-wrapper {
            position: relative;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
        }

        .ai-page-image {
            width: 100%;
            display: block;
            object-fit: cover;
            transition: var(--transition);
        }

        .ai-page-image:hover {
            transform: scale(1.03);
        }

        /* 服务与场景卡片 */
        .services-grid, .production-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .service-card, .prod-card {
            background: var(--white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid rgba(0, 0, 0, 0.03);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
            transition: var(--transition);
        }

        .service-card:hover, .prod-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--card-shadow);
            border-color: rgba(0, 102, 255, 0.1);
        }

        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: rgba(0, 102, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .card-desc {
            color: var(--gray-text);
            font-size: 0.95rem;
        }

        /* 模型聚合展示 */
        .model-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 30px;
        }

        .model-badge {
            background: var(--white);
            border: 1px solid rgba(0, 102, 255, 0.1);
            color: var(--dark);
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: var(--transition);
        }

        .model-badge:hover {
            background: var(--primary);
            color: var(--white);
            transform: translateY(-2px);
        }

        /* 对比评测表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: var(--white);
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            border: 1px solid rgba(0, 0, 0, 0.03);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 800px;
        }

        .comparison-table th, .comparison-table td {
            padding: 18px 24px;
            border-bottom: 1px solid #f1f5f9;
        }

        .comparison-table th {
            background-color: rgba(0, 102, 255, 0.02);
            font-weight: 700;
            color: var(--dark);
        }

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

        .badge-score {
            display: inline-block;
            background: #e1f5fe;
            color: #0288d1;
            padding: 4px 10px;
            border-radius: 4px;
            font-weight: 700;
        }

        .highlight-row {
            background-color: rgba(0, 102, 255, 0.01);
        }

        /* 案例展示 */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .case-card {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.02);
        }

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

        .case-img-container {
            height: 220px;
            overflow: hidden;
            position: relative;
        }

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

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

        .case-info {
            padding: 24px;
        }

        .case-tag {
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 8px;
            display: inline-block;
        }

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

        .faq-item {
            background: var(--white);
            border-radius: 8px;
            margin-bottom: 12px;
            border: 1px solid rgba(0, 0, 0, 0.03);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.01);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            color: var(--gray-text);
            transition: var(--transition);
            font-size: 0.95rem;
        }

        .faq-item.active .faq-answer {
            padding: 0 24px 20px 24px;
            max-height: 200px;
        }

        .faq-icon::after {
            content: '+';
            font-size: 1.25rem;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition);
        }

        .faq-item.active .faq-icon::after {
            content: '-';
            transform: rotate(90deg);
        }

        /* 评论区 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .review-card {
            background: var(--white);
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
            border: 1px solid rgba(0, 0, 0, 0.03);
        }

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

        .reviewer-avatar {
            width: 44px;
            height: 44px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-weight: bold;
        }

        .reviewer-meta h4 {
            font-size: 0.95rem;
            font-weight: 700;
        }

        .reviewer-meta p {
            font-size: 0.8rem;
            color: var(--gray-text);
        }

        .review-text {
            font-size: 0.95rem;
            color: var(--gray-text);
            font-style: italic;
        }

        /* 培训体系时间线 */
        .timeline {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            padding-left: 30px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, var(--primary), var(--primary-light));
        }

        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -28px;
            top: 6px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--white);
            border: 3px solid var(--primary);
        }

        .timeline-title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .timeline-desc {
            color: var(--gray-text);
            font-size: 0.95rem;
        }

        /* 需求表单区 */
        .form-section {
            background: var(--white);
            border-radius: 16px;
            box-shadow: var(--card-shadow);
            padding: 40px;
            max-width: 900px;
            margin: 0 auto;
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

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

        .form-group.full-width {
            grid-column: span 2;
        }

        .form-label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--dark);
        }

        .form-control {
            padding: 12px 16px;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
        }

        /* 资讯 / 知识库 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .news-card {
            background: var(--white);
            padding: 24px;
            border-radius: 12px;
            border: 1px solid rgba(0, 0, 0, 0.03);
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.01);
            transition: var(--transition);
        }

        .news-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--card-shadow);
        }

        .news-date {
            font-size: 0.8rem;
            color: var(--gray-text);
            margin-bottom: 8px;
        }

        .news-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .news-link {
            font-size: 0.9rem;
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        /* 侧边悬浮浮窗 */
        .float-widget {
            position: fixed;
            right: 24px;
            bottom: 24px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            z-index: 999;
        }

        .widget-item {
            width: 50px;
            height: 50px;
            background: var(--white);
            border-radius: 50%;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            position: relative;
            transition: var(--transition);
        }

        .widget-item:hover {
            background: var(--primary);
            color: var(--white);
        }

        .widget-tooltip {
            position: absolute;
            right: 60px;
            background: var(--dark);
            color: var(--white);
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 0.85rem;
            white-space: nowrap;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }

        .widget-item:hover .widget-tooltip {
            opacity: 1;
            visibility: visible;
        }

        .qr-popup {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: var(--white);
            padding: 16px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            display: none;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            z-index: 1001;
        }

        .qr-popup img {
            width: 140px;
            height: 140px;
        }

        .qr-popup p {
            font-size: 0.8rem;
            font-weight: bold;
        }

        .widget-item.kefu:hover .qr-popup {
            display: flex;
        }

        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--white);
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

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

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

        .friendship-links {
            border-top: 1px solid #334155;
            padding-top: 24px;
            margin-bottom: 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .friendship-links a {
            color: #64748b;
            text-decoration: none;
            font-size: 0.85rem;
            transition: var(--transition);
        }

        .friendship-links a:hover {
            color: var(--white);
        }

        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .about-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: var(--white);
                padding: 20px;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
                gap: 16px;
                border-top: 1px solid #e2e8f0;
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .hero-section {
                padding: 120px 0 60px 0;
            }
            .section-title {
                font-size: 1.75rem;
            }
            .stats-grid {
                margin-top: 0;
            }
        }