:root {
            --primary: #0052ff;
            --primary-glow: rgba(0, 82, 255, 0.15);
            --secondary: #7c3aed;
            --accent: #ff7a00;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
            --max-width: 1200px;
        }

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

        /* 全局居中容器 */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部导航 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            backdrop-filter: blur(10px);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-area img {
            height: 40px;
            width: auto;
        }

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

        .nav-menu a {
            text-decoration: none;
            color: var(--text-muted);
            font-weight: 500;
            font-size: 14px;
            transition: color 0.3s;
        }

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

        .nav-btn {
            background-color: var(--primary);
            color: #fff;
            padding: 8px 18px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 500;
            font-size: 14px;
            transition: all 0.3s;
        }

        .nav-btn:hover {
            background-color: #0041cc;
            box-shadow: 0 4px 12px var(--primary-glow);
        }

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

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--text-dark);
            border-radius: 2px;
            transition: 0.3s;
        }

        /* 基础 Section */
        section {
            padding: 80px 0;
        }

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

        .section-title h2 {
            font-size: 32px;
            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: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
        }

        .section-title p {
            color: var(--text-muted);
            font-size: 16px;
            max-width: 600px;
            margin: 0 auto;
        }

        /* Hero 首屏 - 极致鲜亮, 严禁出现图片 */
        .hero {
            padding-top: 150px;
            padding-bottom: 100px;
            background: radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
                        radial-gradient(circle at 20% 80%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                        linear-gradient(180deg, #ffffff 0%, var(--bg-light) 100%);
            text-align: center;
            position: relative;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            background: linear-gradient(90deg, rgba(0,82,255,0.1), rgba(124,58,237,0.1));
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 25px;
            border: 1px solid rgba(0, 82, 255, 0.15);
        }

        .hero h1 {
            font-size: 48px;
            font-weight: 850;
            line-height: 1.2;
            margin-bottom: 25px;
            background: linear-gradient(135deg, var(--text-dark) 30%, var(--primary) 70%, var(--secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -1px;
        }

        .hero-desc {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 40px;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 50px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            padding: 14px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.3);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 82, 255, 0.4);
        }

        .btn-secondary {
            background-color: #fff;
            color: var(--text-dark);
            border: 1px solid var(--border-color);
            padding: 14px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        .btn-secondary:hover {
            background-color: var(--bg-light);
            border-color: #cbd5e1;
            transform: translateY(-2px);
        }

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

        .stat-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            text-align: center;
            box-shadow: 0 2px 8px rgba(0,0,0,0.02);
            transition: transform 0.3s;
        }

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

        .stat-num {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* 平台介绍 & 关于我们 */
        .about-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: var(--text-dark);
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .about-features {
            list-style: none;
        }

        .about-features li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 12px;
            color: var(--text-dark);
            font-weight: 500;
        }

        .about-features li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
            font-size: 18px;
        }

        .about-media {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .about-media img {
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            width: 100%;
        }

        /* 全平台AIGC服务 (模型卡片) */
        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-bottom: 40px;
        }

        .model-tag {
            background-color: #fff;
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 13px;
            color: var(--text-muted);
            transition: all 0.3s;
            font-weight: 500;
        }

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

        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .service-card {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity 0.3s;
        }

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

        .service-card:hover::before {
            opacity: 1;
        }

        .service-icon {
            font-size: 40px;
            margin-bottom: 20px;
        }

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

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

        /* 流程步骤 */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            position: relative;
        }

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

        .step-num {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            font-size: 22px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            box-shadow: 0 4px 10px rgba(0, 82, 255, 0.2);
        }

        .step-item h3 {
            font-size: 18px;
            margin-bottom: 10px;
            color: var(--text-dark);
        }

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

        /* 对比评测表格 */
        .compare-wrap {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            overflow-x: auto;
        }

        .compare-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            flex-wrap: wrap;
            gap: 20px;
        }

        .rating-box {
            background: linear-gradient(135deg, #fff3e0, #fff);
            border: 1px solid #ffe0b2;
            padding: 15px 25px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .rating-num {
            font-size: 32px;
            font-weight: 800;
            color: var(--accent);
        }

        .rating-stars {
            color: var(--accent);
            font-size: 20px;
        }

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

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

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

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

        .check-icon {
            color: #10b981;
            font-weight: bold;
        }

        .cross-icon {
            color: #ef4444;
            font-weight: bold;
        }

        /* 案例展示 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s;
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.06);
        }

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

        .case-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s;
        }

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

        .case-content {
            padding: 20px;
        }

        .case-tag {
            font-size: 12px;
            background-color: var(--primary-glow);
            color: var(--primary);
            padding: 4px 8px;
            border-radius: 4px;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 10px;
        }

        .case-content h3 {
            font-size: 18px;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

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

        /* 培训板块 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 15px;
        }

        .training-card {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 20px;
            text-align: center;
            transition: all 0.3s;
        }

        .training-card:hover {
            border-color: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(124, 58, 237, 0.1);
        }

        .training-icon {
            font-size: 32px;
            margin-bottom: 15px;
        }

        .training-card h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .training-card p {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 评论板块 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .testimonial-card {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.01);
            position: relative;
        }

        .quote-mark {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 40px;
            color: rgba(0, 82, 255, 0.08);
            font-family: Georgia, serif;
            line-height: 1;
        }

        .test-content {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
            position: relative;
            z-index: 2;
        }

        .test-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .avatar-placeholder {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
        }

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

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

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

        .faq-item {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s;
        }

        .faq-question {
            padding: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-dark);
            user-select: none;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            padding: 0 20px;
            color: var(--text-muted);
            font-size: 14px;
            border-top: 0px solid transparent;
        }

        .faq-item.active {
            border-color: var(--primary);
        }

        .faq-item.active .faq-answer {
            max-height: 1000px;
            padding: 0 20px 20px;
            border-top: 1px solid var(--border-color);
            transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
        }

        .faq-icon {
            transition: transform 0.3s;
            font-size: 18px;
        }

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

        /* 资讯 & 表单板块 */
        .contact-news-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
        }

        .form-wrap {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
        }

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

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

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            transition: border-color 0.3s;
            outline: none;
            background-color: var(--bg-light);
        }

        .form-control:focus {
            border-color: var(--primary);
            background-color: #fff;
        }

        .form-submit-btn {
            width: 100%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            border: none;
            padding: 14px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .form-submit-btn:hover {
            box-shadow: 0 4px 15px rgba(0,82,255,0.3);
            transform: translateY(-1px);
        }

        .news-wrap {
            background-color: #fff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .news-item {
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border-color);
        }

        .news-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .news-tag {
            font-size: 11px;
            background-color: #f1f5f9;
            color: var(--text-muted);
            padding: 2px 6px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 6px;
        }

        .news-item h4 {
            font-size: 15px;
            margin-bottom: 8px;
        }

        .news-item a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.3s;
            font-weight: 600;
        }

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

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

        /* 术语与工具箱 */
        .appendix-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

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

        .appendix-card h3 {
            font-size: 18px;
            margin-bottom: 15px;
            color: var(--text-dark);
            border-left: 4px solid var(--primary);
            padding-left: 10px;
        }

        .appendix-list {
            list-style: none;
        }

        .appendix-list li {
            font-size: 14px;
            margin-bottom: 10px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .appendix-list strong {
            color: var(--text-dark);
        }

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

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

        .footer-about h3 {
            color: #fff;
            font-size: 18px;
            margin-bottom: 15px;
        }

        .footer-links h4, .footer-contact h4 {
            color: #fff;
            font-size: 16px;
            margin-bottom: 15px;
        }

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

        .footer-links li {
            margin-bottom: 8px;
        }

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.3s;
        }

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

        .footer-contact p {
            margin-bottom: 8px;
        }

        .qr-codes {
            display: flex;
            gap: 20px;
            margin-top: 15px;
        }

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

        .qr-item img {
            width: 90px;
            height: 90px;
            border-radius: 8px;
            background-color: #fff;
            padding: 5px;
            margin-bottom: 5px;
        }

        .qr-item p {
            font-size: 11px;
            color: #94a3b8;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 30px;
            text-align: center;
            font-size: 12px;
        }

        .footer-bottom p {
            margin-bottom: 10px;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
            margin-top: 15px;
        }

        .friend-links a {
            color: #64748b;
            text-decoration: none;
            transition: color 0.3s;
        }

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

        /* 侧边悬浮栏 */
        .sticky-contact {
            position: fixed;
            right: 20px;
            bottom: 40px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            z-index: 999;
        }

        .sticky-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: #fff;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            position: relative;
            transition: all 0.3s;
            border: 1px solid var(--border-color);
        }

        .sticky-btn:hover {
            background-color: var(--primary);
            color: #fff;
        }

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

        .sticky-qr-pop {
            position: absolute;
            right: 60px;
            bottom: 0;
            background-color: #fff;
            border: 1px solid var(--border-color);
            padding: 12px;
            border-radius: 8px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
            display: none;
            text-align: center;
            width: 140px;
        }

        .sticky-qr-pop img {
            width: 110px;
            height: 110px;
        }

        .sticky-qr-pop p {
            font-size: 11px;
            color: var(--text-dark);
            margin-top: 5px;
            font-weight: 600;
        }

        .sticky-btn:hover .sticky-qr-pop {
            display: block;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .service-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .case-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .training-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: #fff;
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
                box-shadow: 0 4px 10px rgba(0,0,0,0.05);
            }

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

            .menu-toggle {
                display: flex;
            }

            .hero h1 {
                font-size: 32px;
            }

            .about-wrap {
                grid-template-columns: 1fr;
            }

            .service-grid {
                grid-template-columns: 1fr;
            }

            .process-steps {
                grid-template-columns: 1fr;
            }

            .case-grid {
                grid-template-columns: 1fr;
            }

            .training-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .testimonial-grid {
                grid-template-columns: 1fr;
            }

            .contact-news-grid {
                grid-template-columns: 1fr;
            }

            .appendix-grid {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }
        }