:root {
            --primary: #FF5722;
            --primary-hover: #E64A19;
            --primary-light: #FFF5F0;
            --dark: #1E1E24;
            --dark-light: #2D2D35;
            --light: #FAFAFA;
            --text-dark: #2A2A2A;
            --text-muted: #666666;
            --border-color: #EAEAEA;
            --shadow: 0 4px 20px rgba(255, 87, 34, 0.08);
            --transition: all 0.3s ease;
        }

        * {
            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-dark);
            background-color: var(--light);
        }

        body {
            line-height: 1.6;
            overflow-x: hidden;
        }

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

        /* 头部与导航 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
        }

        .nav-container {
            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;
            width: auto;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-dark);
            letter-spacing: 0.5px;
        }

        .brand-name span {
            color: var(--primary);
        }

        .nav-menu {
            display: flex;
            gap: 20px;
            list-style: none;
            align-items: center;
        }

        .nav-menu a {
            text-decoration: none;
            color: var(--text-dark);
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
            padding: 5px 10px;
            border-radius: 4px;
        }

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

        .nav-btn {
            background-color: var(--primary);
            color: #fff !important;
            padding: 8px 16px !important;
            border-radius: 20px !important;
            font-weight: 600 !important;
            box-shadow: 0 4px 10px rgba(255, 87, 34, 0.2);
        }

        .nav-btn:hover {
            background-color: var(--primary-hover) !important;
            transform: translateY(-1px);
        }

        .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(--text-dark);
            border-radius: 3px;
            transition: var(--transition);
        }

        /* Hero 首屏 (无图片) */
        .hero {
            padding: 160px 0 100px;
            background: radial-gradient(circle at 80% 20%, #FFF5F0 0%, #FFFFFF 100%);
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -10%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 87, 34, 0.08) 0%, transparent 70%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-tag {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 87, 34, 0.15);
        }

        .hero h1 {
            font-size: 42px;
            line-height: 1.25;
            color: var(--text-dark);
            margin-bottom: 24px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }

        .hero h1 span {
            color: var(--primary);
        }

        .hero p {
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 40px;
            line-height: 1.6;
        }

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

        .btn-main {
            display: inline-block;
            background-color: var(--primary);
            color: #fff;
            padding: 14px 32px;
            border-radius: 30px;
            text-decoration: none;
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 8px 20px rgba(255, 87, 34, 0.25);
        }

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

        .btn-secondary {
            display: inline-block;
            background-color: #fff;
            color: var(--text-dark);
            padding: 14px 32px;
            border-radius: 30px;
            text-decoration: none;
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }

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

        /* 通用区块样式 */
        section {
            padding: 90px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .section-bg-light {
            background-color: #FFFDFB;
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 60px;
        }

        .section-header h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 15px;
            position: relative;
        }

        .section-header h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background-color: var(--primary);
            margin: 12px auto 0;
            border-radius: 2px;
        }

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

        /* 数据指标 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 30px;
            text-align: center;
        }

        .stat-card {
            background: #fff;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255, 87, 34, 0.05);
            transition: var(--transition);
        }

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

        .stat-number {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 10px;
        }

        .stat-label {
            font-size: 16px;
            color: var(--text-dark);
            font-weight: 600;
        }

        /* 服务能力/场景 */
        .grid-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: #fff;
            padding: 35px 25px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background-color: var(--primary);
            border-radius: 12px 12px 0 0;
            transform: scaleX(0);
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .service-card:hover::before {
            transform: scaleX(1);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary);
            font-size: 24px;
            font-weight: bold;
        }

        .service-card h3 {
            font-size: 20px;
            margin-bottom: 12px;
            color: var(--text-dark);
        }

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

        /* 支持的AI平台 Badge 墙 */
        .platform-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            max-width: 1000px;
            margin: 0 auto;
        }

        .platform-tag {
            background-color: #fff;
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-dark);
            transition: var(--transition);
        }

        .platform-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background-color: var(--primary-light);
            transform: scale(1.05);
        }

        /* 流程步骤 */
        .step-timeline {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            position: relative;
            flex-wrap: wrap;
        }

        .step-item {
            flex: 1;
            min-width: 200px;
            text-align: center;
            position: relative;
            background: #fff;
            padding: 25px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .step-num {
            width: 40px;
            height: 40px;
            background-color: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-weight: 700;
        }

        .step-item h3 {
            font-size: 18px;
            margin-bottom: 10px;
        }

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

        /* 对比评测表格 */
        .table-responsive {
            overflow-x: auto;
            background: #fff;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
        }

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

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

        .compare-table th {
            background-color: var(--primary-light);
            color: var(--text-dark);
            font-weight: 700;
        }

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

        .compare-table tr:hover td {
            background-color: #FFFDFB;
        }

        .badge-score {
            display: inline-block;
            background-color: #FF5722;
            color: #fff;
            padding: 4px 10px;
            border-radius: 12px;
            font-size: 12px;
            font-weight: 600;
        }

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

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

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.05);
        }

        .case-img-wrap {
            width: 100%;
            height: 200px;
            overflow: hidden;
            background-color: #eee;
        }

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

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

        .case-info {
            padding: 20px;
        }

        .case-info h3 {
            font-size: 18px;
            margin-bottom: 8px;
        }

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

        /* 需求表单 */
        .form-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: start;
        }

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

        .form-info h3 {
            font-size: 24px;
            margin-bottom: 20px;
        }

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

        .form-card {
            background: #fff;
            padding: 40px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
        }

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

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 14px;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 14px;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.1);
        }

        .btn-submit {
            background-color: var(--primary);
            color: #fff;
            border: none;
            padding: 14px 20px;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            width: 100%;
            transition: var(--transition);
        }

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

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

        .faq-item {
            background: #fff;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-header {
            padding: 18px 20px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #fff;
            user-select: none;
        }

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

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

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

        .faq-item.active .faq-content {
            padding: 18px 20px;
            border-top: 1px solid var(--border-color);
        }

        /* 客户评论 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }

        .testi-card {
            background: #fff;
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            position: relative;
        }

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

        .testi-author {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .testi-avatar {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background-color: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--primary);
        }

        .testi-name {
            font-size: 15px;
            font-weight: 600;
        }

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

        /* 知识库列表 */
        .articles-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }

        .article-item {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .article-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
        }

        .article-item a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 600;
            display: block;
            margin-bottom: 8px;
        }

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

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

        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
            font-size: 14px;
            border-top: 2px solid var(--primary);
        }

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

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

        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            margin-bottom: 20px;
            font-weight: 600;
        }

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

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: var(--transition);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 20px;
        }

        .friend-links a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            font-size: 13px;
        }

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

        /* 浮动客服 */
        .float-service {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background-color: var(--primary);
            color: #fff;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 5px 20px rgba(255, 87, 34, 0.4);
            cursor: pointer;
            transition: var(--transition);
        }

        .float-service:hover {
            transform: scale(1.1);
        }

        .kefu-popover {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            display: none;
            width: 220px;
            color: var(--text-dark);
            text-align: center;
            border: 1px solid var(--border-color);
        }

        .kefu-popover.active {
            display: block;
        }

        .kefu-popover img {
            width: 150px;
            height: 150px;
            margin-bottom: 10px;
            display: block;
            margin: 0 auto 10px;
        }

        .kefu-popover p {
            font-size: 13px;
            margin-bottom: 5px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: #fff;
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
                gap: 15px;
            }

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

            .menu-toggle {
                display: flex;
            }

            .hero h1 {
                font-size: 30px;
            }

            .hero p {
                font-size: 16px;
            }

            section {
                padding: 60px 0;
            }
        }