:root {
            --primary: #2563eb;       /* 明艳蓝 */
            --secondary: #ff5a00;     /* 撞色橙 */
            --bg-light: #f8fafc;      /* 浅灰底 */
            --text-dark: #0f172a;     /* 深色字 */
            --text-muted: #475569;    /* 次要字 */
            --white: #ffffff;
            --border-color: #e2e8f0;
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

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

        /* 统一居中容器 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }

        /* 顶部导航 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

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

        .logo-area img {
            max-height: 45px;
            width: auto;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 10px;
        }

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

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

        .nav-btn {
            background-color: var(--primary);
            color: var(--white);
            padding: 8px 16px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: bold;
            font-size: 14px;
            transition: var(--transition);
            border: 2px solid var(--primary);
        }

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

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

        .menu-toggle span {
            width: 25px;
            height: 30px;
            background-color: var(--text-dark);
            height: 3px;
            border-radius: 2px;
            transition: var(--transition);
        }

        /* 首屏 Hero - 禁止使用图片 */
        #home {
            background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
            padding: 100px 0 80px 0;
            position: relative;
            overflow: hidden;
        }

        #home::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255,90,0,0.15) 0%, transparent 70%);
            border-radius: 50%;
        }

        #home::after {
            content: '';
            position: absolute;
            bottom: -10%;
            left: -10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%);
            border-radius: 50%;
        }

        .hero-content {
            position: relative;
            z-index: 10;
            text-align: center;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero-tag {
            background-color: var(--secondary);
            color: var(--white);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: bold;
            display: inline-block;
            margin-bottom: 20px;
            letter-spacing: 1px;
        }

        h1 {
            font-size: 2.6rem;
            color: var(--text-dark);
            line-height: 1.25;
            margin-bottom: 20px;
            font-weight: 800;
        }

        .hero-desc {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .btn-primary {
            background-color: var(--secondary);
            color: var(--white);
            padding: 14px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: bold;
            font-size: 16px;
            transition: var(--transition);
            border: 2px solid var(--secondary);
            box-shadow: 0 4px 14px rgba(255, 90, 0, 0.3);
        }

        .btn-primary:hover {
            background-color: transparent;
            color: var(--secondary);
            box-shadow: none;
        }

        .btn-secondary {
            background-color: var(--primary);
            color: var(--white);
            padding: 14px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: bold;
            font-size: 16px;
            transition: var(--transition);
            border: 2px solid var(--primary);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
        }

        .btn-secondary:hover {
            background-color: transparent;
            color: var(--primary);
            box-shadow: none;
        }

        /* 通用区块样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

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

        .section-title h2 {
            font-size: 2.2rem;
            color: var(--text-dark);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background-color: var(--secondary);
            border-radius: 2px;
        }

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

        /* 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .stat-card {
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px 20px;
            text-align: center;
            transition: var(--transition);
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.1);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 10px;
        }

        .stat-label {
            font-size: 15px;
            color: var(--text-muted);
            font-weight: bold;
        }

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

        .intro-text h3 {
            font-size: 1.8rem;
            margin-bottom: 15px;
            color: var(--text-dark);
        }

        .intro-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 16px;
        }

        .intro-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .intro-list li {
            position: relative;
            padding-left: 24px;
            font-size: 14px;
            font-weight: bold;
        }

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

        .img-container {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border: 4px solid var(--white);
        }

        .img-container img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
        }

        /* AIGC服务与制作能力卡片 */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .service-card {
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
            border-color: var(--secondary);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background-color: #eff6ff;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
        }

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

        /* 标签展示 */
        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 15px;
        }

        .model-tag {
            background-color: #f1f5f9;
            color: var(--text-dark);
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 11px;
            font-weight: 500;
        }

        /* 解决方案与服务网络 */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .solution-item {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .solution-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
        }

        .solution-body {
            padding: 25px;
        }

        .solution-body h3 {
            margin-bottom: 10px;
            font-size: 1.2rem;
        }

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

        /* 步骤流程与时间线 */
        .workflow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-item {
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 60px;
            height: 60px;
            background-color: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: bold;
            margin: 0 auto 20px auto;
            border: 4px solid var(--white);
            box-shadow: 0 4px 10px rgba(37,99,235,0.2);
        }

        .step-item:nth-child(even) .step-num {
            background-color: var(--secondary);
            box-shadow: 0 4px 10px rgba(255,90,0,0.2);
        }

        .step-item h3 {
            font-size: 16px;
            margin-bottom: 10px;
        }

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

        /* 评测表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            background-color: var(--white);
        }

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

        .comparison-table th, .comparison-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
        }

        .comparison-table th {
            background-color: #f8fafc;
            font-weight: bold;
            color: var(--text-dark);
        }

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

        .highlight-col {
            background-color: rgba(37, 99, 235, 0.03);
            font-weight: bold;
        }

        .star-rating {
            color: #fbbf24;
            font-size: 16px;
        }

        .score-badge {
            background-color: var(--secondary);
            color: var(--white);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: bold;
            font-size: 12px;
        }

        /* Token比价 */
        .price-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .price-card {
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
            text-align: center;
        }

        .price-val {
            font-size: 1.5rem;
            color: var(--secondary);
            font-weight: bold;
            margin: 10px 0;
        }

        /* 人工智能培训 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .training-card {
            background-color: var(--white);
            border-radius: 12px;
            border: 1px solid var(--border-color);
            padding: 30px;
            position: relative;
            overflow: hidden;
        }

        .training-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background-color: var(--primary);
        }

        .training-card:nth-child(even)::after {
            background-color: var(--secondary);
        }

        .training-card h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
        }

        .training-meta {
            display: flex;
            gap: 15px;
            margin-top: 15px;
            font-size: 13px;
            color: var(--text-muted);
            font-weight: bold;
        }

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

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

        .faq-header {
            padding: 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: bold;
            background-color: var(--white);
            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(90deg);
        }

        .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: 20px;
            max-height: 200px;
            border-top: 1px solid var(--border-color);
        }

        /* 评论卡片 */
        .comment-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .comment-card {
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
        }

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

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

        .author-info h4 {
            font-size: 14px;
            font-weight: bold;
        }

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

        /* 表单与需求匹配 */
        .contact-layout {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
        }

        .form-container {
            background-color: var(--white);
            border-radius: 16px;
            padding: 40px;
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
        }

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

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

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            outline: none;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
        }

        .submit-btn {
            background-color: var(--secondary);
            color: var(--white);
            border: none;
            padding: 14px 28px;
            font-size: 16px;
            font-weight: bold;
            border-radius: 8px;
            cursor: pointer;
            width: 100%;
            transition: var(--transition);
        }

        .submit-btn:hover {
            opacity: 0.9;
        }

        .contact-info-panel {
            background-color: var(--text-dark);
            color: var(--white);
            border-radius: 16px;
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .info-header h3 {
            font-size: 1.5rem;
            margin-bottom: 10px;
            color: var(--white);
        }

        .info-list {
            margin: 30px 0;
            list-style: none;
        }

        .info-list li {
            margin-bottom: 15px;
            font-size: 14px;
        }

        .info-qrcode {
            text-align: center;
            background: rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: 8px;
        }

        .info-qrcode img {
            width: 120px;
            height: 120px;
            margin-bottom: 10px;
            border-radius: 4px;
        }

        .info-qrcode p {
            font-size: 12px;
            color: #94a3b8;
        }

        /* 知识库与文章 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .news-card {
            background-color: var(--white);
            border-radius: 12px;
            border: 1px solid var(--border-color);
            padding: 25px;
            transition: var(--transition);
        }

        .news-card:hover {
            transform: translateY(-3px);
            border-color: var(--primary);
        }

        .news-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }

        .news-card h3 {
            font-size: 16px;
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .news-card h3 a {
            color: var(--text-dark);
            text-decoration: none;
        }

        .news-card h3 a:hover {
            color: var(--primary);
        }

        /* 页脚 & 友情链接 */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 14px;
        }

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

        .footer-col h4 {
            color: var(--white);
            font-size: 16px;
            margin-bottom: 20px;
        }

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

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

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: var(--white);
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 15px;
        }

        .friend-links a {
            color: #64748b;
            text-decoration: none;
            font-size: 13px;
        }

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

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .footer-bottom p {
            font-size: 12px;
        }

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

        /* 悬浮客服面板 */
        .floating-kefu {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background-color: var(--primary);
            color: var(--white);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(37,99,235,0.4);
            font-size: 20px;
        }

        .kefu-popover {
            position: absolute;
            bottom: 60px;
            right: 0;
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 15px;
            width: 200px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            display: none;
            text-align: center;
        }

        .kefu-popover img {
            width: 100%;
            height: auto;
            border-radius: 4px;
            margin-bottom: 8px;
        }

        .kefu-popover p {
            color: var(--text-dark);
            font-size: 12px;
            font-weight: bold;
        }

        /* 响应式样式适配 */
        @media (max-width: 992px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-2col {
                grid-template-columns: 1fr;
            }
            .solutions-grid {
                grid-template-columns: 1fr 1fr;
            }
            .training-grid {
                grid-template-columns: 1fr;
            }
            .comment-grid {
                grid-template-columns: 1fr;
            }
            .contact-layout {
                grid-template-columns: 1fr;
            }
            .workflow-steps {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--white);
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .solutions-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }