:root {
            --primary: #0052ff;
            --secondary: #ff5a00;
            --accent: #00e676;
            --dark: #0f172a;
            --light: #f8fafc;
            --gray: #64748b;
            --border: #e2e8f0;
            --card-bg: #ffffff;
            --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

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

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

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

        /* 顶部导航 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
            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: 10px;
        }

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

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

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

        .nav-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--dark);
            padding: 5px 10px;
            border-radius: 4px;
        }

        .nav-link:hover {
            color: var(--primary);
            background-color: rgba(0, 82, 255, 0.05);
        }

        .nav-btn {
            background: linear-gradient(135deg, var(--primary), #0040c7);
            color: #ffffff !important;
            padding: 8px 18px;
            border-radius: 20px;
            font-weight: 600;
            box-shadow: 0 4px 10px rgba(0, 82, 255, 0.2);
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(0, 82, 255, 0.3);
        }

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

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* 移动端菜单激活状态 */
        .menu-toggle.active span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        .menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .menu-toggle.active span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* 纯文本首屏 Hero Area */
        .hero-section {
            padding: 160px 0 80px 0;
            background: radial-gradient(circle at 80% 20%, rgba(0, 82, 255, 0.05) 0%, transparent 50%),
                        radial-gradient(circle at 10% 80%, rgba(255, 90, 0, 0.05) 0%, transparent 50%);
            border-bottom: 1px solid var(--border);
            text-align: center;
        }

        .hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(0, 82, 255, 0.08);
            color: var(--primary);
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
            border: 1px solid rgba(0, 82, 255, 0.15);
        }

        .hero-title {
            font-size: clamp(32px, 5vw, 48px);
            font-weight: 800;
            line-height: 1.25;
            color: var(--dark);
            margin-bottom: 24px;
            letter-spacing: -1px;
        }

        .hero-title span {
            background: linear-gradient(135deg, var(--primary) 30%, var(--secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-subtitle {
            font-size: clamp(16px, 2.5vw, 20px);
            color: var(--gray);
            max-width: 800px;
            margin: 0 auto 40px auto;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 60px;
        }

        .btn-main {
            background: linear-gradient(135deg, var(--secondary), #e04f00);
            color: #ffffff;
            padding: 14px 32px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: 700;
            box-shadow: 0 6px 20px rgba(255, 90, 0, 0.3);
        }

        .btn-main:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(255, 90, 0, 0.4);
        }

        .btn-sub {
            background: #ffffff;
            color: var(--dark);
            padding: 14px 32px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: 700;
            border: 1px solid var(--border);
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }

        .btn-sub:hover {
            background-color: var(--light);
            border-color: var(--gray);
        }

        /* 模块统一样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border);
        }

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

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            transform: translateX(-50%);
            width: 50px;
            height: 4px;
            background: var(--secondary);
            border-radius: 2px;
        }

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

        /* 数据指标卡片 */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
            margin-top: 20px;
        }

        .metric-card {
            background: var(--card-bg);
            padding: 30px 20px;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.03);
            border: 1px solid var(--border);
            transition: var(--transition);
            text-align: center;
        }

        .metric-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
            box-shadow: 0 10px 25px rgba(0, 82, 255, 0.08);
        }

        .metric-num {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 10px;
        }

        .metric-label {
            font-size: 16px;
            color: var(--dark);
            font-weight: 600;
            margin-bottom: 5px;
        }

        .metric-desc {
            font-size: 13px;
            color: var(--gray);
        }

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

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

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.08);
            border-color: var(--secondary);
        }

        .service-icon {
            font-size: 32px;
            margin-bottom: 20px;
            color: var(--primary);
        }

        .service-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--dark);
        }

        .service-list {
            list-style: none;
            margin-bottom: 20px;
        }

        .service-list li {
            font-size: 14px;
            color: var(--gray);
            margin-bottom: 8px;
            position: relative;
            padding-left: 18px;
        }

        .service-list li::before {
            content: '✓';
            color: var(--accent);
            position: absolute;
            left: 0;
            font-weight: bold;
        }

        /* 平台支撑与模型聚合 */
        .platform-logos {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-top: 30px;
        }

        .platform-tag {
            background: var(--light);
            border: 1px solid var(--border);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            color: var(--dark);
            font-weight: 500;
            transition: var(--transition);
        }

        .platform-tag:hover {
            background: var(--primary);
            color: #ffffff;
            border-color: var(--primary);
        }

        /* 流程步骤 */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 30px;
            position: relative;
        }

        .step-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            padding: 30px;
            border-radius: 12px;
            position: relative;
            text-align: center;
        }

        .step-num {
            width: 40px;
            height: 40px;
            background: var(--secondary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            margin: 0 auto 20px auto;
            box-shadow: 0 4px 10px rgba(255, 90, 0, 0.3);
        }

        /* 对比评测表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
        }

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

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

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

        .comparison-table tr:hover {
            background-color: rgba(0, 82, 255, 0.02);
        }

        .comparison-table td.highlight {
            color: var(--primary);
            font-weight: 700;
            background-color: rgba(0, 82, 255, 0.01);
        }

        .score-badge {
            display: inline-block;
            padding: 4px 10px;
            background-color: #fff3cd;
            color: #856404;
            border-radius: 4px;
            font-weight: bold;
        }

        /* 案例与素材展示 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .case-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0,0,0,0.02);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.06);
        }

        .case-img-wrap {
            position: relative;
            background-color: #eaeaea;
            aspect-ratio: 16/9;
            overflow: hidden;
        }

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

        .case-content {
            padding: 24px;
        }

        .case-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--secondary);
            background: rgba(255, 90, 0, 0.1);
            padding: 2px 8px;
            border-radius: 4px;
            margin-bottom: 10px;
            font-weight: bold;
        }

        .case-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--dark);
        }

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

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 8px;
            margin-bottom: 15px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-header {
            padding: 20px;
            font-weight: 700;
            color: var(--dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 16px;
        }

        .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 {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            background-color: rgba(0, 0, 0, 0.01);
        }

        .faq-content p {
            padding: 20px;
            color: var(--gray);
            border-top: 1px solid var(--border);
            font-size: 14px;
        }

        .faq-item.active .faq-content {
            max-height: 1000px;
            transition: max-height 1s cubic-bezier(1, 0, 1, 0);
        }

        /* 用户评论 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .testimonial-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.02);
        }

        .testimonial-text {
            font-style: italic;
            color: var(--dark);
            font-size: 14px;
            margin-bottom: 20px;
            position: relative;
        }

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

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

        .author-info h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--dark);
        }

        .author-info p {
            font-size: 12px;
            color: var(--gray);
        }

        /* 表单与需求匹配 */
        .matching-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: start;
        }

        .form-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.04);
        }

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

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

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 14px;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.1);
        }

        .submit-btn {
            background: linear-gradient(135deg, var(--primary), #0040c7);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 8px;
            font-weight: 700;
            cursor: pointer;
            width: 100%;
            font-size: 16px;
            box-shadow: 0 4px 12px rgba(0, 82, 255, 0.2);
            transition: var(--transition);
        }

        .submit-btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(0, 82, 255, 0.3);
        }

        /* 资讯与知识库 */
        .news-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .news-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 24px;
            transition: var(--transition);
        }

        .news-item:hover {
            border-color: var(--primary);
            box-shadow: 0 6px 20px rgba(0,0,0,0.04);
        }

        .news-title {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .news-title a {
            color: var(--dark);
        }

        .news-title a:hover {
            color: var(--primary);
        }

        .news-desc {
            font-size: 13px;
            color: var(--gray);
            margin-bottom: 15px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: #94a3b8;
            padding: 60px 0 30px 0;
            border-top: 1px solid rgba(255,255,255,0.1);
        }

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

        .footer-logo-area {
            grid-column: span 2;
        }

        @media (max-width: 768px) {
            .footer-logo-area {
                grid-column: span 1;
            }
        }

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

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

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

        .footer-links a {
            font-size: 14px;
            color: #94a3b8;
        }

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

        .footer-contact-info {
            font-size: 14px;
            line-height: 1.8;
        }

        .qrcode-wrapper {
            margin-top: 15px;
            background: #fff;
            padding: 8px;
            border-radius: 8px;
            display: inline-block;
        }

        .qrcode-wrapper img {
            width: 100px;
            height: 100px;
        }

        .friend-links {
            padding: 20px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            margin-bottom: 20px;
        }

        .friend-links-title {
            font-size: 14px;
            color: #ffffff;
            margin-bottom: 10px;
            font-weight: 600;
        }

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

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

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

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

        .ai-page-home-link {
            color: var(--primary);
            font-weight: bold;
        }

        /* 侧边悬浮客服 */
        .floating-service {
            position: fixed;
            right: 20px;
            bottom: 80px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            z-index: 999;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            cursor: pointer;
            position: relative;
            transition: var(--transition);
        }

        .float-btn:hover {
            background-color: var(--secondary);
            transform: scale(1.05);
        }

        .float-btn svg {
            width: 24px;
            height: 24px;
            fill: currentColor;
        }

        .qr-popover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: white;
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 10px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.1);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            width: 140px;
            text-align: center;
        }

        .qr-popover img {
            width: 120px;
            height: 120px;
            margin-bottom: 5px;
        }

        .qr-popover span {
            font-size: 12px;
            color: var(--dark);
            font-weight: 600;
        }

        .float-btn:hover .qr-popover {
            opacity: 1;
            visibility: visible;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .matching-layout {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .nav-menu {
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: #ffffff;
                flex-direction: column;
                padding: 20px;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
                display: none;
            }
            .nav-menu.show {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
        }