/* 变量及重置 */
        :root {
            --primary: #0052d9;
            --primary-light: #e3f2fd;
            --secondary: #7000ff;
            --accent: #ff007f;
            --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
            --text-main: #1e293b;
            --text-muted: #64748b;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --border-color: #e2e8f0;
            --radius-lg: 16px;
            --radius-md: 8px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            line-height: 1.6;
        }

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

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

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

        /* 顶部导航 */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .ai-page-logo {
            height: 40px;
            display: block;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 800;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        nav a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
        }

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

        .nav-btn {
            background: var(--gradient);
            color: #fff;
            padding: 8px 18px;
            border-radius: 30px;
            font-weight: bold;
            font-size: 14px;
        }

        .nav-btn:hover {
            color: #fff;
            box-shadow: 0 4px 15px rgba(112, 0, 255, 0.3);
            transform: translateY(-1px);
        }

        .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;
            transition: var(--transition);
        }

        /* 通用 Section 样式 */
        section {
            padding: 80px 0;
            background-color: var(--bg-white);
        }

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

        .section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 50px auto;
        }

        .section-header h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background: var(--gradient);
            margin: 10px auto 0 auto;
            border-radius: 2px;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 16px;
        }

        /* 首屏 Hero - 无图片限制 */
        .hero {
            background: radial-gradient(circle at 80% 20%, rgba(112, 0, 255, 0.05) 0%, transparent 50%), 
                        radial-gradient(circle at 10% 80%, rgba(0, 82, 217, 0.05) 0%, transparent 50%),
                        var(--bg-white);
            padding: 120px 0 100px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-inner {
            text-align: center;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 25px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.03); }
            100% { transform: scale(1); }
        }

        .hero h1 {
            font-size: 46px;
            line-height: 1.25;
            font-weight: 900;
            margin-bottom: 25px;
            letter-spacing: -0.5px;
        }

        .hero h1 span {
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .hero-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 700;
            transition: var(--transition);
        }

        .btn-primary {
            background: var(--gradient);
            color: #fff;
            box-shadow: 0 4px 20px rgba(112, 0, 255, 0.25);
        }

        .btn-primary:hover {
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(112, 0, 255, 0.4);
        }

        .btn-secondary {
            background: #fff;
            color: var(--text-main);
            border: 2px solid var(--border-color);
        }

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

        .hero-highlights {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 50px;
        }

        .highlight-item {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: var(--radius-lg);
            transition: var(--transition);
        }

        .highlight-item:hover {
            transform: translateY(-5px);
            border-color: var(--secondary);
            box-shadow: 0 10px 25px rgba(112, 0, 255, 0.05);
        }

        .highlight-num {
            font-size: 28px;
            font-weight: 800;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 5px;
        }

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

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

        .about-content h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: var(--primary);
        }

        .about-text {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 25px;
        }

        .about-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .about-badges span {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-main);
        }

        .about-image-wrapper {
            position: relative;
        }

        .about-image-wrapper img {
            border-radius: var(--radius-lg);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            width: 100%;
            display: block;
        }

        /* 核心服务与模型 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 30px;
            border-radius: var(--radius-lg);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--gradient);
            opacity: 0;
            transition: var(--transition);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(112, 0, 255, 0.08);
            border-color: transparent;
        }

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

        .card-icon {
            font-size: 32px;
            margin-bottom: 20px;
            color: var(--primary);
            display: inline-block;
        }

        .card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 15px;
        }

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

        /* 标签云模型墙 */
        .model-wall {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            margin-top: 50px;
        }

        .model-wall h4 {
            text-align: center;
            font-size: 18px;
            margin-bottom: 25px;
            color: var(--text-main);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
        }

        .tag-item {
            padding: 8px 18px;
            border-radius: 30px;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
        }

        .tag-item:hover {
            background: var(--gradient);
            color: #fff;
            border-color: transparent;
            transform: scale(1.05);
        }

        /* 对比评测表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            background: var(--bg-white);
        }

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

        th, td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 15px;
        }

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

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

        .highlight-col {
            background-color: rgba(0, 82, 217, 0.02);
            font-weight: 600;
        }

        .rating-badge {
            background: linear-gradient(135deg, #ff9800 0%, #ff5722 100%);
            color: #fff;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 12px;
            display: inline-block;
        }

        /* 案例中心 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

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

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.06);
        }

        .case-img-container {
            width: 100%;
            aspect-ratio: 16/10;
            overflow: hidden;
            background: #eaeaea;
        }

        .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-content {
            padding: 24px;
        }

        .case-tag {
            font-size: 12px;
            color: var(--primary);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
            display: block;
        }

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

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

        /* 流程步骤与时间线 */
        .timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
            margin-top: 40px;
        }

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

        .step-number {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--gradient);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            margin: 0 auto 20px auto;
            box-shadow: 0 4px 10px rgba(112, 0, 255, 0.2);
        }

        .timeline-step h4 {
            font-size: 18px;
            margin-bottom: 10px;
        }

        .timeline-step p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 表单与需求匹配 */
        .form-section {
            background: linear-gradient(135deg, rgba(0, 82, 217, 0.02) 0%, rgba(112, 0, 255, 0.02) 100%), var(--bg-white);
        }

        .form-container {
            max-width: 800px;
            margin: 0 auto;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.04);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 25px;
        }

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

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

        .form-group label {
            font-size: 14px;
            font-weight: 600;
        }

        .form-control {
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            outline: none;
            font-size: 14px;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-light);
        }

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

        .form-submit-btn {
            width: 100%;
            border: none;
            cursor: pointer;
        }

        /* FAQ 与 折叠板 */
        .faq-grid {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

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

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 20px;
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.8;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
        }

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

        .faq-icon::after {
            content: '+';
            font-size: 20px;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition);
            display: inline-block;
        }

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

        /* 评论卡片 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .review-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.02);
        }

        .review-rating {
            color: #ffb800;
            margin-bottom: 15px;
            font-size: 18px;
        }

        .review-text {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 20px;
        }

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

        .user-avatar-placeholder {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
        }

        .user-info h4 {
            font-size: 14px;
            font-weight: 700;
        }

        .user-info p {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 文章列表与资讯 */
        .article-section {
            background-color: var(--bg-light);
        }

        .articles-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
            margin-top: 30px;
        }

        .article-item {
            background: var(--bg-white);
            padding: 24px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .article-meta {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }

        .article-title-link {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 15px;
            display: block;
        }

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

        /* 浮动客服 */
        .float-contact {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .float-item {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--bg-white);
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid var(--border-color);
            position: relative;
        }

        .float-item:hover {
            background: var(--gradient);
            color: #fff;
            transform: translateY(-3px);
        }

        .float-item svg {
            width: 22px;
            height: 22px;
            fill: currentColor;
        }

        .qr-popover {
            position: absolute;
            bottom: 60px;
            right: 0;
            width: 160px;
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 15px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            display: none;
            text-align: center;
        }

        .qr-popover img {
            width: 100%;
            height: auto;
            margin-bottom: 8px;
        }

        .qr-popover p {
            font-size: 12px;
            color: var(--text-main);
            margin: 0;
        }

        .float-item:hover .qr-popover {
            display: block;
        }

        /* 页脚区域 */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 80px 0 30px 0;
            font-size: 14px;
            border-top: 1px solid #1e293b;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 50px;
        }

        .footer-col h4 {
            color: #f8fafc;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }

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

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

        .footer-col ul li a {
            color: #94a3b8;
        }

        .footer-col ul li a:hover {
            color: #fff;
        }

        .contact-info-list li {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 30px;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .links-group {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 13px;
        }

        .links-group a {
            color: #64748b;
        }

        .links-group a:hover {
            color: #fff;
        }

        .copyright-area {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .grid-3, .reviews-grid, .case-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .timeline {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }

            nav {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: #fff;
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }

            nav.active {
                display: flex;
            }

            .hero h1 {
                font-size: 32px;
            }

            .hero-highlights {
                grid-template-columns: repeat(2, 1fr);
            }

            .about-grid {
                grid-template-columns: 1fr;
            }

            .grid-3, .reviews-grid, .case-grid {
                grid-template-columns: 1fr;
            }

            .timeline {
                grid-template-columns: 1fr;
            }

            .form-grid {
                grid-template-columns: 1fr;
            }

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

            .articles-list {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }
        }