:root {
            --primary: #7c3aed;
            --secondary: #ec4899;
            --accent: #06b6d4;
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --text-title: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --gradient-trend: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
            --gradient-soft: linear-gradient(135deg, rgba(124, 58, 237, 0.05) 0%, rgba(236, 72, 153, 0.05) 100%);
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 40px -15px rgba(124, 58, 237, 0.15);
            --radius: 12px;
        }

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

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

        /* 统一容器 */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* 艳色潮流排版修饰 */
        .trend-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            font-size: 0.85rem;
            font-weight: 600;
            color: #ffffff;
            background: var(--gradient-trend);
            border-radius: 50px;
            margin-bottom: 1rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

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

        /* 按钮样式 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.75rem;
            border-radius: 8px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--gradient-trend);
            color: #ffffff;
            box-shadow: 0 4px 15px rgba(124, 58, 237, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(124, 58, 237, 0.45);
        }

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

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

        /* Header 导航 */
        header {
            background-color: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

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

        .logo-text {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--text-title);
        }

        nav {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        nav a {
            text-decoration: none;
            color: var(--text-body);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s;
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-title);
        }

        /* Hero 首屏 - 无任何图片 */
        .hero {
            padding: 160px 0 100px 0;
            background: radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.08) 0%, rgba(124, 58, 237, 0.05) 50%, rgba(255, 255, 255, 0) 100%), var(--bg-card);
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .hero-inner {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 3rem;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 3rem;
            line-height: 1.2;
            color: var(--text-title);
            margin-bottom: 1.5rem;
        }

        .hero-desc {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 2.5rem;
            max-width: 600px;
        }

        .hero-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }

        /* CSS 绘制的虚拟模型控制面板 */
        .hero-visual {
            background: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
            border-radius: 20px;
            padding: 2rem;
            box-shadow: var(--shadow-lg);
            border: 2px solid rgba(236, 72, 153, 0.2);
            color: #ffffff;
            position: relative;
        }

        .hero-visual::before {
            content: '';
            position: absolute;
            top: -10px;
            left: -10px;
            right: -10px;
            bottom: -10px;
            border: 1px dashed var(--secondary);
            border-radius: 24px;
            opacity: 0.3;
            animation: rotate 60s linear infinite;
            pointer-events: none;
        }

        .panel-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding-bottom: 1rem;
            margin-bottom: 1.5rem;
        }

        .panel-dots {
            display: flex;
            gap: 6px;
        }

        .panel-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: #ef4444;
        }

        .panel-dot:nth-child(2) { background-color: #eab308; }
        .panel-dot:nth-child(3) { background-color: #22c55e; }

        .panel-title {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            font-family: monospace;
        }

        .panel-body {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .panel-row {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 8px;
            padding: 0.75rem 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-left: 3px solid var(--accent);
        }

        .panel-row:nth-child(2) { border-left-color: var(--secondary); }
        .panel-row:nth-child(3) { border-left-color: var(--primary); }

        .panel-label {
            font-size: 0.9rem;
            font-weight: 500;
        }

        .panel-val {
            font-size: 0.85rem;
            color: var(--accent);
            font-family: monospace;
            background: rgba(6, 182, 212, 0.1);
            padding: 2px 8px;
            border-radius: 4px;
        }

        /* 数据指标卡片 */
        .section-padding {
            padding: 80px 0;
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 3.5rem auto;
        }

        .section-header h2 {
            font-size: 2.25rem;
            color: var(--text-title);
            margin-bottom: 1rem;
        }

        .section-header p {
            color: var(--text-muted);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.5rem;
        }

        .stat-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 2rem;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: rgba(124, 58, 237, 0.2);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }

        .stat-label {
            font-size: 1rem;
            color: var(--text-title);
            font-weight: 600;
            margin-bottom: 0.25rem;
        }

        .stat-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* 全平台 AIGC 服务 & 聚合 */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
        }

        .service-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 2.5rem 2rem;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

        .service-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--gradient-trend);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }

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

        .service-icon {
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            display: inline-block;
        }

        .service-card h3 {
            font-size: 1.35rem;
            color: var(--text-title);
            margin-bottom: 1rem;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
        }

        .service-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .service-features li {
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .service-features li::before {
            content: '✓';
            color: var(--secondary);
            font-weight: bold;
        }

        /* 模型聚合墙 */
        .model-wall {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 3rem;
            box-shadow: var(--shadow-sm);
        }

        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            justify-content: center;
        }

        .model-tag {
            padding: 0.5rem 1.25rem;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            background-color: var(--bg-main);
            color: var(--text-title);
            border: 1px solid var(--border-color);
            transition: all 0.2s;
        }

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

        /* 流程步骤 */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 2rem;
            position: relative;
        }

        .step-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 2.5rem 2rem;
            text-align: center;
            position: relative;
            box-shadow: var(--shadow-sm);
        }

        .step-num {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background: var(--gradient-trend);
            color: #ffffff;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem auto;
            box-shadow: 0 4px 10px rgba(124, 58, 237, 0.2);
        }

        .step-card h3 {
            font-size: 1.15rem;
            margin-bottom: 0.75rem;
            color: var(--text-title);
        }

        .step-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* 对比评测表格 */
        .table-container {
            width: 100%;
            overflow-x: auto;
            background-color: #ffffff;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

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

        th, td {
            padding: 1.25rem 1.5rem;
            border-bottom: 1px solid var(--border-color);
        }

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

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

        .highlight-col {
            background-color: rgba(124, 58, 237, 0.03);
            font-weight: 600;
        }

        .score-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background-color: #fef08a;
            color: #854d0e;
            border-radius: 4px;
            font-weight: 700;
        }

        /* 推荐评分卡片 */
        .rating-box {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-around;
            align-items: center;
            background: var(--gradient-soft);
            border: 1px solid rgba(124, 58, 237, 0.1);
            border-radius: var(--radius);
            padding: 2.5rem;
            margin-top: 2rem;
            text-align: center;
        }

        .rating-item h4 {
            font-size: 1.1rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }

        .rating-val {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary);
        }

        /* 案例展示区 */
        .portfolio-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
        }

        .portfolio-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
        }

        .portfolio-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }

        .portfolio-img-container {
            width: 100%;
            height: 200px;
            overflow: hidden;
            background-color: var(--bg-main);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .portfolio-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .portfolio-card:hover .portfolio-img-container img {
            transform: scale(1.08);
        }

        .portfolio-info {
            padding: 1.5rem;
        }

        .portfolio-tag {
            font-size: 0.75rem;
            color: var(--secondary);
            font-weight: bold;
            text-transform: uppercase;
            margin-bottom: 0.5rem;
            display: block;
        }

        .portfolio-info h3 {
            font-size: 1.15rem;
            color: var(--text-title);
            margin-bottom: 0.5rem;
        }

        .portfolio-info p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* 价格卡片 */
        .price-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .price-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 2.5rem 2rem;
            text-align: center;
            position: relative;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s;
        }

        .price-card.popular {
            border-color: var(--secondary);
            box-shadow: var(--shadow-lg);
            transform: scale(1.03);
        }

        .price-card.popular::before {
            content: '最佳性价比';
            position: absolute;
            top: 15px;
            right: 15px;
            background-color: var(--secondary);
            color: #ffffff;
            font-size: 0.75rem;
            padding: 0.25rem 0.75rem;
            border-radius: 50px;
            font-weight: 600;
        }

        .price-card h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }

        .price-amount {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--text-title);
            margin-bottom: 1.5rem;
        }

        .price-amount span {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-muted);
        }

        .price-list {
            list-style: none;
            margin-bottom: 2rem;
            text-align: left;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .price-list li {
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .price-list li::before {
            content: '✓';
            color: var(--accent);
            font-weight: bold;
        }

        /* 客户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
        }

        .review-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow-sm);
            position: relative;
        }

        .review-quote {
            font-size: 0.95rem;
            color: var(--text-body);
            margin-bottom: 1.5rem;
            position: relative;
            z-index: 1;
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .review-avatar-placeholder {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background: var(--gradient-trend);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1rem;
        }

        .review-meta h4 {
            font-size: 0.95rem;
            color: var(--text-title);
        }

        .review-meta p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* 常见问题 FAQ 折叠面板 */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .faq-item {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            transition: border-color 0.3s;
        }

        .faq-question {
            width: 100%;
            padding: 1.25rem 1.5rem;
            text-align: left;
            background: none;
            border: none;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-title);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: color 0.3s;
        }

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

        .faq-icon {
            font-size: 1.2rem;
            transition: transform 0.3s;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background-color: rgba(248, 250, 252, 0.5);
        }

        .faq-answer-content {
            padding: 1.25rem 1.5rem;
            font-size: 0.95rem;
            color: var(--text-body);
            border-top: 1px solid var(--border-color);
        }

        /* 展开时的状态 */
        .faq-item.active {
            border-color: var(--primary);
        }

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

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

        /* 知识库文章列表 */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
        }

        .article-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 1.75rem;
            box-shadow: var(--shadow-sm);
            transition: border-color 0.3s;
        }

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

        .article-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 0.75rem;
        }

        .article-card h3 {
            font-size: 1.15rem;
            color: var(--text-title);
            margin-bottom: 1rem;
            line-height: 1.4;
        }

        .article-link {
            font-size: 0.9rem;
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
        }

        .article-link:hover {
            text-decoration: underline;
        }

        /* 需求表单与联系 */
        .contact-section {
            background-color: #ffffff;
            border-top: 1px solid var(--border-color);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 3rem;
        }

        .form-card {
            background-color: var(--bg-main);
            border-radius: var(--radius);
            padding: 2.5rem;
            border: 1px solid var(--border-color);
        }

        .form-group {
            margin-bottom: 1.25rem;
        }

        .form-label {
            display: block;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 0.5rem;
        }

        .form-input, .form-select, .form-textarea {
            width: 100%;
            padding: 0.75rem 1rem;
            border-radius: 6px;
            border: 1px solid var(--border-color);
            background-color: #ffffff;
            color: var(--text-body);
            font-size: 0.95rem;
            transition: border-color 0.3s, box-shadow 0.3s;
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
            outline: none;
        }

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

        .contact-info {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .info-block {
            margin-bottom: 2rem;
        }

        .info-block h3 {
            font-size: 1.25rem;
            color: var(--text-title);
            margin-bottom: 1rem;
        }

        .info-detail {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .info-item {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.95rem;
        }

        .info-icon {
            color: var(--secondary);
            font-weight: bold;
        }

        .qrcode-box {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            background-color: var(--bg-main);
            border: 1px solid var(--border-color);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin-top: 1.5rem;
        }

        .qrcode-box img {
            width: 100px;
            height: 100px;
            object-fit: cover;
            border-radius: 6px;
            border: 1px solid var(--border-color);
        }

        .qrcode-desc h4 {
            font-size: 1rem;
            color: var(--text-title);
            margin-bottom: 0.25rem;
        }

        .qrcode-desc p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* 友情链接与页脚 */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
            border-top: 1px solid #1e293b;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 3rem;
            border-bottom: 1px solid #1e293b;
            padding-bottom: 3rem;
        }

        .footer-brand h3 {
            color: #ffffff;
            font-size: 1.35rem;
            margin-bottom: 1rem;
        }

        .footer-links h4 {
            color: #ffffff;
            font-size: 1rem;
            margin-bottom: 1.25rem;
        }

        .footer-links-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .footer-links-list a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s;
        }

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

        .friend-links-area {
            background-color: rgba(255, 255, 255, 0.02);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }

        .friend-links-title {
            color: #ffffff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        .friend-links-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .friend-links-wrapper a {
            color: #64748b;
            text-decoration: none;
            font-size: 0.85rem;
            transition: color 0.2s;
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .ai-page-home-link {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
        }

        /* 浮动客服 */
        .float-kefu {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background: var(--gradient-trend);
            color: #ffffff;
            padding: 0.75rem 1.25rem;
            border-radius: 50px;
            box-shadow: var(--shadow-lg);
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            transition: transform 0.3s;
        }

        .float-kefu:hover {
            transform: translateY(-3px) scale(1.05);
        }

        .kefu-modal {
            position: fixed;
            bottom: 90px;
            right: 30px;
            z-index: 1000;
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            padding: 1.5rem;
            width: 250px;
            display: none;
            text-align: center;
            animation: slideUp 0.3s ease-out;
        }

        .kefu-modal img {
            width: 150px;
            height: 150px;
            margin: 0 auto 1rem auto;
            display: block;
            border-radius: 4px;
        }

        .kefu-modal h4 {
            font-size: 1rem;
            color: var(--text-title);
            margin-bottom: 0.25rem;
        }

        .kefu-modal p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* 关键帧动画 */
        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        @keyframes slideUp {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* 移动端响应式适配 */
        @media (max-width: 992px) {
            .hero-inner {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-actions {
                justify-content: center;
            }
            .contact-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }

        @media (max-width: 768px) {
            .nav-actions {
                display: none; /* 简化移动端导航 */
            }
            nav {
                display: none; /* 在实际应用中，可利用 JS 控制展开 */
            }
            .mobile-menu-btn {
                display: block;
            }
            .hero-content h1 {
                font-size: 2.25rem;
            }
            .section-header h2 {
                font-size: 1.75rem;
            }
        }