:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --accent: #ec4899;
            --accent-glow: rgba(236, 72, 153, 0.25);
            --bg-color: #f8fafc;
            --card-bg: #ffffff;
            --text-main: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
            --container-width: 1200px;
            --header-height: 80px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

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

        /* 顶部导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            display: flex;
            align-items: center;
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

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

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

        .brand-name {
            font-size: 20px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0;
        }

        .nav-links a {
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
            border-radius: 6px;
        }

        .nav-links a:hover {
            color: var(--primary);
            background: rgba(99, 102, 241, 0.08);
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 14px;
            font-weight: 600;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            border: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: var(--text-main);
        }

        /* Hero 首屏 */
        .hero-section {
            padding-top: calc(var(--header-height) + 60px);
            padding-bottom: 80px;
            background: radial-gradient(circle at 50% 10%, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
            text-align: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(99, 102, 241, 0.1);
            color: var(--primary);
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 24px;
            animation: fadeInDown 0.8s ease;
        }

        .hero-title {
            font-size: clamp(36px, 5vw, 56px);
            font-weight: 900;
            letter-spacing: -1px;
            color: var(--text-main);
            margin-bottom: 20px;
            line-height: 1.2;
            animation: fadeInUp 0.8s ease 0.1s both;
        }

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

        .hero-desc {
            font-size: clamp(16px, 2vw, 18px);
            color: var(--text-muted);
            max-width: 720px;
            margin: 0 auto 36px auto;
            animation: fadeInUp 0.8s ease 0.2s both;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 50px;
            animation: fadeInUp 0.8s ease 0.3s both;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            max-width: 900px;
            margin: 0 auto;
            animation: fadeInUp 0.8s ease 0.4s both;
        }

        .stat-card {
            background: var(--card-bg);
            padding: 24px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
            box-shadow: 0 8px 30px rgba(99, 102, 241, 0.1);
        }

        .stat-number {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 6px;
        }

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

        /* 通用区块样式 */
        section {
            padding: 80px 0;
        }

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

        .section-tag {
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--primary);
            margin-bottom: 8px;
            display: block;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 12px;
        }

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

        /* 关于我们 & 平台介绍 */
        .grid-2col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .about-content h3 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-main);
        }

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

        .feature-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 24px;
        }

        .feature-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            font-size: 14px;
            color: var(--text-main);
        }

        .feature-item svg {
            width: 20px;
            height: 20px;
            fill: var(--primary);
            flex-shrink: 0;
        }

        .about-visual {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 193, 0.1));
            border-radius: 20px;
            padding: 40px;
            border: 1px solid var(--border-color);
            position: relative;
        }

        /* 服务能力卡片网格 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }

        .service-card {
            background: var(--card-bg);
            border-radius: 16px;
            padding: 30px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }

        .service-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
            border-color: var(--primary);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background: rgba(99, 102, 241, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary);
            font-weight: bold;
            font-size: 20px;
        }

        .service-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .service-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* 流程步骤 */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            position: relative;
        }

        .process-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px 20px;
            text-align: center;
            position: relative;
        }

        .process-num {
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: #ffffff;
            font-weight: 800;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px auto;
        }

        .process-card h5 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
        }

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

        /* 行业方案与模型标签云 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-top: 30px;
        }

        .tag-pill {
            padding: 8px 18px;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .tag-pill:hover {
            background: var(--primary);
            color: #ffffff;
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* 对比评测表格 */
        .comparison-table-wrapper {
            background: var(--card-bg);
            border-radius: 16px;
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
        }

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

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

        .comparison-table th {
            background: #f1f5f9;
            font-weight: 700;
            color: var(--text-main);
        }

        .comparison-table td:nth-child(2) {
            color: var(--primary);
            font-weight: 700;
            background: rgba(99, 102, 241, 0.03);
        }

        .rating-stars {
            color: #f59e0b;
            font-weight: 700;
        }

        /* 案例与素材展示 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }

        .case-card {
            background: var(--card-bg);
            border-radius: 16px;
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        }

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

        .ai-page-image {
            width: 100%;
            height: auto;
            display: block;
        }

        .case-info {
            padding: 24px;
        }

        .case-info h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

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

        /* 用户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .review-card {
            background: var(--card-bg);
            border-radius: 16px;
            border: 1px solid var(--border-color);
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

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

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

        .author-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            font-weight: 700;
        }

        .author-info h5 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-main);
        }

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

        /* 文章列表 */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .article-card {
            background: var(--card-bg);
            border-radius: 12px;
            border: 1px solid var(--border-color);
            padding: 20px;
            transition: var(--transition);
        }

        .article-card:hover {
            border-color: var(--primary);
        }

        .article-card h5 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .article-card a {
            font-size: 13px;
            color: var(--primary);
            font-weight: 650;
        }

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

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

        .faq-question {
            padding: 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-question::after {
            content: "+";
            font-size: 20px;
            color: var(--primary);
            transition: var(--transition);
        }

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

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

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

        /* 需求表单区域 */
        .form-section-bg {
            background: linear-gradient(135deg, #1e1b4b, #312e81);
            color: #ffffff;
            border-radius: 24px;
            padding: 60px 40px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
        }

        .form-section-bg .section-title,
        .form-section-bg .section-subtitle,
        .form-section-bg .section-tag {
            color: #ffffff;
        }

        .form-section-bg .section-subtitle {
            color: #cbd5e1;
        }

        .custom-form {
            max-width: 700px;
            margin: 40px auto 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .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;
            color: #e2e8f0;
        }

        .form-control {
            padding: 12px 16px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: rgba(255, 255, 255, 0.05);
            color: #ffffff;
            font-size: 14px;
            outline: none;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--accent);
            background: rgba(255, 255, 255, 0.1);
        }

        .form-control option {
            background: #1e1b4b;
            color: #ffffff;
        }

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

        /* 页脚 */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-col h5 {
            color: #ffffff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-col a {
            color: #94a3b8;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
            text-align: center;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            margin-bottom: 15px;
        }

        .friend-links a {
            color: #64748b;
            font-size: 13px;
        }

        .friend-links a:hover {
            color: #cbd5e1;
        }

        /* 浮动客服 */
        .floating-kefu {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background: #ffffff;
            border-radius: 50px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            padding: 10px 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            border: 1px solid var(--border-color);
            cursor: pointer;
            transition: var(--transition);
        }

        .floating-kefu:hover {
            transform: scale(1.05);
        }

        .floating-kefu img {
            width: 32px;
            height: 32px;
            border-radius: 50%;
        }

        .kefu-popup {
            position: absolute;
            bottom: 70px;
            right: 0;
            background: #ffffff;
            padding: 16px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            width: 200px;
            text-align: center;
            display: none;
            border: 1px solid var(--border-color);
        }

        .floating-kefu:hover .kefu-popup {
            display: block;
        }

        .kefu-popup img {
            width: 140px;
            height: 140px;
            border-radius: 8px;
            margin-bottom: 8px;
        }

        /* 动画关键帧 */
        @keyframes fadeInDown {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* 响应式媒体查询 */
        @media (max-width: 992px) {
            .grid-2col {
                grid-template-columns: 1fr;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: #ffffff;
                flex-direction: column;
                padding: 20px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            }
            .nav-links.active {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .custom-form {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
        }