/* roulang page: index */
:root {
            --primary: #0F52BA;
            --primary-hover: #0A3C8A;
            --accent: #00A3E0;
            --accent-blue: #2563EB;
            --bg-base: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-dark: #0B132B;
            --bg-dark-card: #152244;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --text-light: #94A3B8;
            --border-color: #E2E8F0;
            --border-dark: #2A3B60;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 28px rgba(15,82,186,0.12);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: var(--font-sans);
            background-color: var(--bg-base);
            color: var(--text-main);
        }

        body {
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.25s ease;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        /* 布局容器 */
        .container {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section-header {
            text-align: center;
            max-width: 780px;
            margin: 0 auto 50px auto;
        }

        .section-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(15, 82, 186, 0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 50px;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-main);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }

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

        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
            box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            box-shadow: 0 6px 20px rgba(15, 82, 186, 0.35);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: #FFFFFF;
            color: var(--primary);
            border: 1px solid var(--border-color);
        }

        .btn-outline:hover {
            border-color: var(--primary);
            background-color: rgba(15, 82, 186, 0.04);
            transform: translateY(-2px);
        }

        /* 顶部通栏与导航 */
        .top-bar {
            background: #0B132B;
            color: #94A3B8;
            font-size: 13px;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .top-bar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-bar-info span {
            margin-right: 20px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            transition: all 0.3s;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: -0.5px;
        }
        .brand-logo-badge {
            background: var(--accent);
            color: #fff;
            font-size: 11px;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: normal;
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 28px;
            align-items: center;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary);
        }

        /* Section 基础样式 */
        .site-section {
            padding: 80px 0;
            position: relative;
        }
        .bg-white-section { background-color: #FFFFFF; }
        .bg-gray-section { background-color: var(--bg-base); }
        .bg-dark-section { background-color: var(--bg-dark); color: #FFFFFF; }

        /* S1: Hero 搜索与问答中心风格 */
        .hero-section {
            position: relative;
            padding: 90px 0 100px;
            background: linear-gradient(180deg, rgba(15,82,186,0.06) 0%, rgba(248,250,252,1) 100%), url('/assets/images/a1826fd9c7c52d31.webp') center/cover no-repeat;
            text-align: center;
        }
        .hero-content {
            max-width: 860px;
            margin: 0 auto;
        }
        .hero-title {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 20px;
            letter-spacing: -0.03em;
        }
        .hero-subtitle {
            font-size: 17px;
            color: var(--text-muted);
            margin-bottom: 36px;
            line-height: 1.75;
            max-width: 780px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-search-box {
            background: #FFFFFF;
            padding: 8px 12px 8px 24px;
            border-radius: 50px;
            display: flex;
            align-items: center;
            box-shadow: 0 12px 32px rgba(15, 82, 186, 0.12);
            border: 1px solid var(--border-color);
            max-width: 680px;
            margin: 0 auto 20px;
        }
        .hero-search-input {
            flex: 1;
            border: none;
            outline: none;
            font-size: 16px;
            color: var(--text-main);
            background: transparent;
        }
        .hero-chips {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            margin-top: 16px;
        }
        .chip-label { font-size: 13px; color: var(--text-muted); }
        .chip-item {
            font-size: 13px;
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            padding: 4px 14px;
            border-radius: 20px;
            color: var(--text-main);
            transition: all 0.2s;
        }
        .chip-item:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(15,82,186,0.03);
        }

        /* S2: KPI 看板 */
        .kpi-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .kpi-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 30px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
        }
        .kpi-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: #CBD5E1;
        }
        .kpi-num {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1;
            letter-spacing: -0.03em;
        }
        .kpi-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 6px;
        }
        .kpi-desc {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* S3: 核心服务矩阵 (3x2 栅格) */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .service-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }
        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: rgba(15,82,186,0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: bold;
            margin-bottom: 20px;
        }
        .service-title {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .service-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.65;
            margin-bottom: 18px;
            flex-grow: 1;
        }
        .service-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .service-tag-item {
            font-size: 12px;
            background: #F1F5F9;
            color: #475569;
            padding: 2px 10px;
            border-radius: 4px;
        }

        /* S4: 结果对比 (传统 vs 行业大模型) */
        .compare-table-wrapper {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }
        .compare-table th, .compare-table td {
            padding: 20px 24px;
            border-bottom: 1px solid var(--border-color);
        }
        .compare-table th {
            background: #F8FAFC;
            font-weight: 700;
            color: var(--text-main);
            font-size: 16px;
        }
        .compare-table tr:last-child td { border-bottom: none; }
        .highlight-col {
            background: rgba(15,82,186,0.02);
            color: var(--primary);
            font-weight: 600;
        }
        .status-badge-win {
            display: inline-block;
            padding: 2px 8px;
            border-radius: 4px;
            background: #DCFCE7;
            color: #166534;
            font-size: 12px;
            font-weight: 600;
        }

        /* S5: 4步走方案流程与里程碑 */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .step-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 22px;
            position: relative;
        }
        .step-number {
            font-size: 28px;
            font-weight: 900;
            color: var(--accent);
            margin-bottom: 12px;
            line-height: 1;
        }
        .step-title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }
        .step-text {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* S6: 深色案例与架构图示 */
        .arch-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .arch-visual {
            background: var(--bg-dark-card);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 30px;
        }
        .arch-layer {
            background: rgba(255,255,255,0.04);
            border: 1px dashed rgba(255,255,255,0.15);
            border-radius: 8px;
            padding: 16px;
            margin-bottom: 16px;
        }
        .arch-layer:last-child { margin-bottom: 0; }
        .arch-layer-title {
            font-size: 14px;
            color: var(--accent);
            font-weight: 700;
            margin-bottom: 6px;
            text-transform: uppercase;
        }
        .arch-layer-desc {
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.5;
        }

        /* S7: 行业解决方案纵深 */
        .industry-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .industry-card {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
        }
        .industry-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .industry-img-box {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .industry-img-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .industry-card:hover .industry-img-box img {
            transform: scale(1.05);
        }
        .industry-content {
            padding: 24px;
        }
        .industry-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }
        .industry-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.65;
            margin-bottom: 16px;
        }
        .industry-meta {
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            border-top: 1px solid var(--border-color);
            padding-top: 14px;
            display: flex;
            justify-content: space-between;
        }

        /* S8: 资讯列表 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .news-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }
        .news-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-lg);
        }
        .news-date {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .news-heading {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.45;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .news-summary {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 16px;
            flex-grow: 1;
        }
        .news-link {
            font-size: 14px;
            color: var(--primary);
            font-weight: 600;
        }

        /* S9: 行业客户评价墙 */
        .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: 28px;
            box-shadow: var(--shadow-sm);
        }
        .review-quote {
            font-size: 14.5px;
            color: #334155;
            line-height: 1.7;
            margin-bottom: 20px;
            font-style: italic;
        }
        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .review-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #E2E8F0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--primary);
        }
        .review-name {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
        }
        .review-role {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* S10: 平台保障承诺条 */
        .guarantee-bar {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 30px 40px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            box-shadow: var(--shadow-sm);
        }
        .guarantee-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }
        .guarantee-icon {
            font-size: 22px;
            color: var(--primary);
            margin-top: 2px;
        }
        .guarantee-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 4px;
        }
        .guarantee-desc {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* S11: FAQ 折叠面板 */
        .faq-accordion {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.2s;
        }
        .faq-item:hover {
            border-color: #CBD5E1;
        }
        .faq-header {
            padding: 20px 24px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 700;
            font-size: 16px;
            color: var(--text-main);
            user-select: none;
        }
        .faq-icon {
            font-size: 18px;
            transition: transform 0.3s;
        }
        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
            background: #FAFBFD;
        }
        .faq-body-inner {
            padding: 0 24px 20px 24px;
            font-size: 14.5px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .faq-item.active .faq-body {
            max-height: 300px;
            transition: max-height 0.35s ease-in-out;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        /* S12: 底部综合转化 CTA */
        .cta-box {
            background: linear-gradient(135deg, #0F52BA 0%, #0B132B 100%);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            color: #FFFFFF;
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 40px;
            align-items: center;
            box-shadow: var(--shadow-lg);
        }
        .cta-left h2 {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .cta-left p {
            font-size: 15px;
            color: #CBD5E1;
            line-height: 1.7;
            margin-bottom: 24px;
        }
        .cta-form {
            background: #FFFFFF;
            padding: 30px;
            border-radius: var(--radius-md);
            color: var(--text-main);
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-main);
        }
        .form-control {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 14px;
            outline: none;
            transition: border-color 0.2s;
        }
        .form-control:focus {
            border-color: var(--primary);
        }

        /* 页脚规范 */
        .site-footer {
            background: #0B132B;
            color: #94A3B8;
            padding: 70px 0 30px;
            font-size: 14px;
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 50px;
        }
        .footer-brand h3 {
            color: #FFFFFF;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-brand p {
            line-height: 1.7;
            margin-bottom: 20px;
            font-size: 13.5px;
        }
        .footer-col h4 {
            color: #FFFFFF;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 18px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.08);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
        }

        /* 移动端菜单控制 */
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: var(--text-main);
        }

        /* 响应式断点系统 */
        @media (max-width: 1024px) {
            .kpi-grid { grid-template-columns: repeat(2, 1fr); }
            .services-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-container { grid-template-columns: repeat(2, 1fr); }
            .industry-cards { grid-template-columns: repeat(2, 1fr); }
            .news-grid { grid-template-columns: repeat(2, 1fr); }
            .reviews-grid { grid-template-columns: repeat(2, 1fr); }
            .guarantee-bar { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .arch-grid { grid-template-columns: 1fr; }
            .cta-box { grid-template-columns: 1fr; }
        }

        @media (max-width: 768px) {
            .site-section { padding: 50px 0; }
            .top-bar { display: none; }
            .hero-title { font-size: 28px; }
            .section-title { font-size: 24px; }
            .mobile-toggle { display: block; }
            .nav-menu {
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: #FFFFFF;
                flex-direction: column;
                padding: 24px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                display: none;
                gap: 16px;
            }
            .nav-menu.show { display: flex; }
            .kpi-grid { grid-template-columns: 1fr; }
            .services-grid { grid-template-columns: 1fr; }
            .steps-container { grid-template-columns: 1fr; }
            .industry-cards { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .reviews-grid { grid-template-columns: 1fr; }
            .guarantee-bar { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
            .cta-box { padding: 36px 20px; }
        }