/* 全局变量定义 - 亮橙炽艳风 */
        :root {
            --primary: #ff5500;
            --primary-hover: #e04b00;
            --primary-light: #fff2eb;
            --primary-accent: #ff8800;
            --secondary: #1e293b;
            --text-main: #2b3442;
            --text-muted: #64748b;
            --bg-body: #fdfdfd;
            --bg-surface: #ffffff;
            --bg-alt: #f8fafc;
            --border-color: #e2e8f0;
            --shadow-sm: 0 2px 8px rgba(255, 85, 0, 0.06);
            --shadow-md: 0 8px 24px rgba(255, 85, 0, 0.1);
            --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.08);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --max-width: 1200px;
        }

        * {
            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;
            background-color: var(--bg-body);
            color: var(--text-main);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: all 0.25s ease;
        }

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

        /* 统一容器 */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 标题规范 */
        h1, h2, h3, h4 {
            color: var(--secondary);
            font-weight: 700;
            line-height: 1.3;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 20px;
            margin-bottom: 12px;
            border: 1px solid rgba(255, 85, 0, 0.2);
        }

        .section-title {
            font-size: 2rem;
            color: var(--secondary);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto;
        }

        /* 按钮组件 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 600;
            border-radius: 30px;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: none;
            outline: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, #ff6600 0%, #e04b00 100%);
            color: #ffffff !important;
            box-shadow: 0 4px 16px rgba(255, 85, 0, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 85, 0, 0.45);
        }

        .btn-secondary {
            background: #ffffff;
            color: var(--secondary) !important;
            border: 1.5px solid var(--border-color);
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
        }

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

        /* 顶部导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

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

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

        .nav-links {
            display: flex;
            gap: 0; /* 严格符合控制指令要求 */
            align-items: center;
            list-style: none;
        }

        .nav-links li a {
            padding: 8px 14px;
            color: var(--text-main);
            font-size: 14px;
            font-weight: 500;
            border-radius: 6px;
            display: block;
        }

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

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

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

        /* 首屏 HERO 区域 - 禁绝任何图片资源 */
        .hero-section {
            padding: 80px 0 60px;
            background: radial-gradient(circle at 80% 20%, rgba(255, 85, 0, 0.08) 0%, rgba(255, 255, 255, 0) 50%),
                        radial-gradient(circle at 20% 80%, rgba(255, 136, 0, 0.05) 0%, rgba(255, 255, 255, 0) 50%),
                        #ffffff;
            text-align: center;
            border-bottom: 1px solid var(--border-color);
            position: relative;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: linear-gradient(90deg, #fff5f0 0%, #ffeae0 100%);
            border: 1px solid rgba(255, 85, 0, 0.2);
            border-radius: 30px;
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 2.5rem;
            color: var(--secondary);
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 48px;
            flex-wrap: wrap;
        }

        .hero-metrics {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            max-width: 960px;
            margin: 0 auto;
            padding: 24px;
            background: #ffffff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            border: 1px solid rgba(255, 85, 0, 0.1);
        }

        .metric-item {
            text-align: center;
        }

        .metric-value {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
        }

        .metric-label {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* 纯文本通栏与卡片网格 */
        .section-block {
            padding: 72px 0;
            background: var(--bg-surface);
        }

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

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 20px;
        }

        .feature-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 28px;
            border-radius: var(--radius-md);
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
        }

        .card-icon-text {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 18px;
        }

        .feature-card h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 标签云模型墙 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 24px;
        }

        .model-tag {
            padding: 6px 14px;
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 20px;
            font-size: 13px;
            color: var(--secondary);
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .model-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }

        /* 比价表格 */
        .table-responsive {
            overflow-x: auto;
            background: #ffffff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .custom-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 14px;
        }

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

        .custom-table th {
            background: var(--bg-alt);
            color: var(--secondary);
            font-weight: 600;
        }

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

        .badge-sale {
            padding: 2px 8px;
            background: #ff4d4f;
            color: #ffffff;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
        }

        /* 对比评测卡片 */
        .rating-box {
            background: linear-gradient(135deg, #fff9f5 0%, #fff0e6 100%);
            border: 2px solid var(--primary);
            border-radius: var(--radius-md);
            padding: 32px;
            text-align: center;
            margin-bottom: 40px;
        }

        .rating-score {
            font-size: 3.5rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
            margin: 10px 0;
        }

        .rating-stars {
            color: #ff9d00;
            font-size: 24px;
            margin-bottom: 12px;
        }

        /* 案例与图文展台 */
        .media-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }

        .media-card {
            background: #ffffff;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .media-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }

        .media-body {
            padding: 20px;
        }

        /* 流程步骤 */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            position: relative;
        }

        .step-card {
            background: #ffffff;
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            position: relative;
        }

        .step-num {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 10px;
        }

        /* 用户评论 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .testimonial-card {
            background: #ffffff;
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .user-info {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
        }

        .avatar-text {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--primary);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        /* 折叠面板 FAQ */
        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
        }

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

        .faq-header {
            padding: 18px 24px;
            font-weight: 600;
            color: var(--secondary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #ffffff;
        }

        .faq-header:hover {
            color: var(--primary);
        }

        .faq-body {
            padding: 0 24px 18px;
            color: var(--text-muted);
            font-size: 0.95rem;
            display: none;
            border-top: 1px solid #f1f5f9;
            padding-top: 14px;
        }

        .faq-item.active .faq-body {
            display: block;
        }

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

        /* 表单模块 */
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-md);
        }

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

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

        .contact-form input,
        .contact-form select,
        .contact-form textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 14px;
            color: var(--text-main);
            background: var(--bg-alt);
            outline: none;
            transition: all 0.25s;
        }

        .contact-form input:focus,
        .contact-form select:focus,
        .contact-form textarea:focus {
            border-color: var(--primary);
            background: #ffffff;
            box-shadow: 0 0 0 3px rgba(255, 85, 0, 0.15);
        }

        .qr-box {
            text-align: center;
            padding: 20px;
            background: var(--bg-alt);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }

        .qr-box img {
            max-width: 160px;
            height: auto;
            border-radius: 8px;
            margin-bottom: 12px;
        }

        /* 页脚 */
        .site-footer {
            background: #111827;
            color: #9ca3af;
            padding: 60px 0 30px;
            font-size: 14px;
            border-top: 1px solid #1f2937;
        }

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

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

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

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

        .footer-col ul li a {
            color: #9ca3af;
        }

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

        .friend-links-wrap a {
            display: inline-block;
            color: #9ca3af;
            margin-right: 12px;
            margin-bottom: 8px;
        }

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

        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid #1f2937;
            text-align: center;
            color: #6b7280;
            font-size: 13px;
        }

        /* 浮动组件 */
        .float-widget {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
        }

        .float-btn:hover {
            transform: scale(1.1);
            background: var(--primary-hover);
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .hero-metrics {
                grid-template-columns: repeat(2, 1fr);
            }
            .contact-wrapper {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 1.8rem;
            }
            .menu-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow-md);
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.active {
                display: flex;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }