:root {
            --primary: #4361ee;
            --primary-dark: #3a0ca3;
            --rainbow-1: #ff595e;
            --rainbow-2: #ffca3a;
            --rainbow-3: #8ac926;
            --rainbow-4: #1982c4;
            --rainbow-5: #6a4c93;
            --rainbow-grad: linear-gradient(135deg, #ff595e 0%, #ffca3a 25%, #8ac926 50%, #1982c4 75%, #6a4c93 100%);
            --rainbow-soft: linear-gradient(135deg, rgba(255,89,94,0.08) 0%, rgba(255,202,58,0.08) 25%, rgba(138,201,38,0.08) 50%, rgba(25,130,196,0.08) 75%, rgba(106,76,147,0.08) 100%);
            --text-main: #1f2937;
            --text-muted: #4b5563;
            --text-light: #6b7280;
            --bg-page: #f8fafc;
            --bg-card: #ffffff;
            --border-color: #e2e8f0;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
            --shadow-md: 0 6px 18px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 30px rgba(67, 97, 238, 0.12);
            --radius-md: 12px;
            --radius-lg: 20px;
            --max-w: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-page);
            line-height: 1.6;
        }

        body {
            position: relative;
            overflow-x: hidden;
            background: linear-gradient(180deg, #ffffff 0%, #f4f7fe 30%, #fdfbf7 70%, #f8fafc 100%);
        }

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

        /* 顶部导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }

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

        .brand-zone {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

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

        .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.5px;
        }

        .brand-tagline {
            font-size: 11px;
            color: #6a4c93;
            background: rgba(106, 76, 147, 0.1);
            padding: 2px 8px;
            border-radius: 999px;
            font-weight: 600;
        }

        .nav-links {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 0; /* 严格要求 gap 为 0 */
        }

        .nav-links li a {
            display: block;
            padding: 8px 14px;
            color: var(--text-main);
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.25s ease;
        }

        .nav-links li a:hover,
        .nav-links li a.active {
            color: var(--primary);
            background-color: rgba(67, 97, 238, 0.08);
        }

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

        .btn-rainbow {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            background: var(--rainbow-grad);
            color: #ffffff !important;
            font-size: 14px;
            font-weight: 700;
            text-decoration: none;
            border-radius: 999px;
            box-shadow: 0 4px 15px rgba(255, 89, 94, 0.3);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            border: none;
            cursor: pointer;
        }

        .btn-rainbow:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(25, 130, 196, 0.4);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 9px 20px;
            background: #ffffff;
            color: var(--primary-dark);
            font-size: 14px;
            font-weight: 600;
            text-decoration: none;
            border-radius: 999px;
            border: 1px solid var(--border-color);
            transition: all 0.2s ease;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            background: #f8faff;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-main);
            cursor: pointer;
            padding: 6px;
        }

        /* 统一分段排版 */
        .section-padding {
            padding: 72px 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            max-width: 780px;
            margin: 0 auto 48px auto;
        }

        .section-badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 1px;
            padding: 4px 14px;
            border-radius: 999px;
            background: var(--rainbow-soft);
            color: #b83280;
            border: 1px solid rgba(255, 89, 94, 0.2);
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: #111827;
            margin-bottom: 14px;
            line-height: 1.3;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 彩虹线条修饰 */
        .rainbow-divider {
            height: 4px;
            width: 80px;
            margin: 16px auto 0 auto;
            background: var(--rainbow-grad);
            border-radius: 999px;
        }

        /* Hero 首屏 - 绝对无任何图片 */
        .hero-section {
            padding: 80px 0 60px 0;
            background: radial-gradient(circle at 50% 20%, rgba(255, 202, 58, 0.15), rgba(67, 97, 238, 0.08) 50%, rgba(255, 255, 255, 0) 80%);
            position: relative;
            text-align: center;
        }

        .hero-banner-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #ffffff;
            border: 1px solid rgba(25, 130, 196, 0.25);
            padding: 6px 18px;
            border-radius: 999px;
            font-size: 13px;
            color: var(--text-main);
            font-weight: 600;
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
        }

        .hero-banner-tag .dot {
            width: 8px;
            height: 8px;
            background: #8ac926;
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.4; transform: scale(1.3); }
        }

        .hero-title {
            font-size: 44px;
            font-weight: 900;
            line-height: 1.25;
            color: #0f172a;
            max-width: 920px;
            margin: 0 auto 20px auto;
            letter-spacing: -0.5px;
        }

        .hero-subtitle {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 760px;
            margin: 0 auto 36px auto;
            line-height: 1.7;
        }

        .hero-cta-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            margin-bottom: 48px;
            flex-wrap: wrap;
        }

        .btn-large {
            padding: 14px 34px;
            font-size: 16px;
        }

        .hero-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            max-width: 1040px;
            margin: 0 auto;
        }

        .stat-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 24px 16px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
            position: relative;
            overflow: hidden;
        }

        .stat-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--rainbow-grad);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .stat-num {
            font-size: 28px;
            font-weight: 900;
            color: #1e1b4b;
            margin-bottom: 6px;
        }

        .stat-label {
            font-size: 13px;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 平台聚合模型跑马标签 */
        .model-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            max-width: 960px;
            margin: 32px auto 0 auto;
        }

        .model-chip {
            padding: 6px 14px;
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            color: var(--text-main);
            box-shadow: 0 1px 3px rgba(0,0,0,0.02);
            transition: all 0.2s ease;
        }

        .model-chip:hover {
            border-color: #6a4c93;
            background: rgba(106, 76, 147, 0.05);
            color: #6a4c93;
            transform: scale(1.05);
        }

        /* 卡片网格系统通用 */
        .cards-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .cards-grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

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

        .service-card {
            background: #ffffff;
            border: 1px solid #e5e7eb;
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(67, 97, 238, 0.4);
        }

        .card-tag {
            align-self: flex-start;
            font-size: 11px;
            font-weight: 700;
            padding: 3px 10px;
            border-radius: 6px;
            background: #f1f5f9;
            color: #475569;
            margin-bottom: 16px;
        }

        .card-tag.highlight {
            background: rgba(255, 89, 94, 0.12);
            color: #ff595e;
        }

        .service-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: #111827;
            margin-bottom: 12px;
        }

        .service-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 18px;
            flex-grow: 1;
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 0 0 16px 0;
        }

        .feature-list li {
            font-size: 13px;
            color: #374151;
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .feature-list li::before {
            content: '✓';
            color: #8ac926;
            font-weight: 900;
        }

        /* 流程步骤 */
        .step-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }

        .step-num {
            width: 44px;
            height: 44px;
            margin: 0 auto 16px auto;
            border-radius: 50%;
            background: var(--rainbow-grad);
            color: #ffffff;
            font-weight: 800;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .step-item h4 {
            font-size: 16px;
            color: #111827;
            margin-bottom: 8px;
        }

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

        /* 案例中心图文排版 */
        .case-showcase {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .case-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

        .case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .case-img-wrap {
            width: 100%;
            background: #f1f5f9;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .case-img-wrap img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: contain;
            transition: transform 0.4s ease;
        }

        .case-card:hover .case-img-wrap img {
            transform: scale(1.03);
        }

        .case-content {
            padding: 20px;
        }

        .case-content h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
            color: #111827;
        }

        .case-content p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* 对比评测板块 */
        .evaluation-box {
            background: #ffffff;
            border: 2px solid rgba(255, 202, 58, 0.4);
            border-radius: var(--radius-lg);
            padding: 36px;
            box-shadow: var(--shadow-md);
            margin-bottom: 32px;
        }

        .rating-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 24px;
            border-bottom: 1px solid #f1f5f9;
            margin-bottom: 24px;
            flex-wrap: wrap;
            gap: 16px;
        }

        .rating-score-box {
            display: flex;
            align-items: baseline;
            gap: 10px;
        }

        .big-score {
            font-size: 48px;
            font-weight: 900;
            color: #ff595e;
            line-height: 1;
        }

        .score-denom {
            font-size: 18px;
            color: var(--text-light);
            font-weight: 600;
        }

        .stars {
            color: #ffca3a;
            font-size: 22px;
            letter-spacing: 2px;
        }

        .compare-table-wrap {
            overflow-x: auto;
        }

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

        .compare-table th, 
        .compare-table td {
            padding: 14px 16px;
            border-bottom: 1px solid #e5e7eb;
        }

        .compare-table th {
            background: #f8fafc;
            color: #374151;
            font-weight: 700;
        }

        .compare-table tr:hover td {
            background: #fcfdfe;
        }

        .tag-win {
            color: #15803d;
            background: #dcfce7;
            padding: 3px 8px;
            border-radius: 4px;
            font-weight: 700;
            font-size: 12px;
        }

        .tag-loss {
            color: #991b1b;
            background: #fee2e2;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 12px;
        }

        /* 需求匹配与表单 */
        .form-section-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 36px;
            align-items: start;
        }

        .form-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-sm);
        }

        .form-group {
            margin-bottom: 18px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 700;
            color: #374151;
            margin-bottom: 6px;
        }

        .form-control {
            width: 100%;
            padding: 11px 14px;
            border: 1px solid #d1d5db;
            border-radius: 8px;
            font-size: 14px;
            color: var(--text-main);
            background: #ffffff;
            outline: none;
            transition: border-color 0.2s ease;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
        }

        /* 客户评价板块 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .review-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .review-text {
            font-size: 14px;
            color: #4b5563;
            line-height: 1.6;
            margin-bottom: 18px;
            font-style: italic;
        }

        .reviewer-info {
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid #f1f5f9;
            padding-top: 14px;
        }

        .reviewer-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--rainbow-soft);
            color: var(--primary-dark);
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
        }

        .reviewer-meta h5 {
            font-size: 14px;
            color: #111827;
            margin-bottom: 2px;
        }

        .reviewer-meta span {
            font-size: 12px;
            color: var(--text-light);
        }

        /* FAQ 折叠面板 */
        .faq-accordion {
            max-width: 880px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color 0.2s ease;
        }

        .faq-header {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 700;
            color: #1f2937;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            user-select: none;
            background: #ffffff;
        }

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

        .faq-icon {
            font-size: 18px;
            font-weight: 400;
            color: #9ca3af;
            transition: transform 0.3s ease;
        }

        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            background: #fafbfc;
            padding: 0 24px;
            color: #4b5563;
            font-size: 14px;
            line-height: 1.7;
        }

        .faq-item.active .faq-body {
            padding: 16px 24px 20px 24px;
            max-height: 250px;
        }

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

        /* 文章与资讯列表 */
        .articles-box {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-sm);
        }

        .article-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 16px;
        }

        .article-link-item {
            display: inline-block;
            padding: 8px 16px;
            background: #f1f5f9;
            color: #334155;
            text-decoration: none;
            border-radius: 6px;
            font-size: 13px;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .article-link-item:hover {
            background: var(--primary);
            color: #ffffff;
        }

        /* 联系方式与客服区域 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 32px;
            align-items: center;
        }

        .contact-info-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .contact-card-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: var(--radius-md);
        }

        .contact-card-item h4 {
            font-size: 15px;
            color: #111827;
            margin-bottom: 6px;
        }

        .contact-card-item p {
            font-size: 14px;
            color: var(--primary-dark);
            font-weight: 600;
        }

        .qr-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 24px;
            border-radius: var(--radius-lg);
            text-align: center;
            box-shadow: var(--shadow-sm);
        }

        .qr-card img {
            width: 160px;
            height: 160px;
            object-fit: contain;
            margin: 0 auto 12px auto;
            border-radius: 8px;
            border: 1px solid #e5e7eb;
            display: block;
        }

        /* 友情链接与页脚 */
        .site-footer {
            background: #ffffff;
            border-top: 1px solid #e2e8f0;
            padding: 48px 0 24px 0;
            color: var(--text-muted);
        }

        .footer-top {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1.5fr;
            gap: 36px;
            margin-bottom: 36px;
        }

        .footer-brand h3 {
            font-size: 18px;
            color: #111827;
            margin-bottom: 10px;
        }

        .footer-brand p {
            font-size: 13px;
            line-height: 1.6;
            color: var(--text-light);
        }

        .friend-links-wrap h4 {
            font-size: 15px;
            color: #111827;
            margin-bottom: 12px;
        }

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

        .friend-links-group a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 13px;
            transition: color 0.2s;
        }

        .friend-links-group a:hover {
            color: var(--primary);
            text-decoration: underline;
        }

        .footer-bottom {
            border-top: 1px solid #f1f5f9;
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
            color: var(--text-light);
        }

        .ai-page-home-link {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            margin-left: 8px;
        }

        .ai-page-home-link:hover {
            text-decoration: underline;
        }

        /* 侧边悬浮客服 */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 24px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: #ffffff;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 20px;
            text-decoration: none;
            border: 1px solid #e2e8f0;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .float-btn:hover {
            background: var(--primary);
            color: #ffffff;
            transform: scale(1.08);
        }

        /* 响应式媒体查询 */
        @media (max-width: 992px) {
            .cards-grid-3,
            .reviews-grid,
            .case-showcase {
                grid-template-columns: repeat(2, 1fr);
            }
            .step-timeline,
            .hero-stats-grid,
            .cards-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .form-section-layout,
            .contact-grid,
            .footer-top {
                grid-template-columns: 1fr;
            }
            .hero-title {
                font-size: 32px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: #ffffff;
                flex-direction: column;
                padding: 16px;
                border-bottom: 1px solid #e2e8f0;
                box-shadow: var(--shadow-md);
            }
            .nav-links.show {
                display: flex;
            }
            .mobile-menu-btn {
                display: block;
            }
            .cards-grid-3,
            .cards-grid-2,
            .cards-grid-4,
            .reviews-grid,
            .case-showcase,
            .step-timeline,
            .hero-stats-grid,
            .contact-info-list {
                grid-template-columns: 1fr;
            }
            .hero-title {
                font-size: 26px;
            }
            .section-title {
                font-size: 24px;
            }
        }