/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-hover: #1D4ED8;
            --accent: #0284C7;
            --accent-teal: #0D9488;
            --bg-base: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-dark: #0F172A;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border: #E2E8F0;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-full: 9999px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-hover: 0 12px 24px -4px rgba(30, 64, 175, 0.12), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-body);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

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

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部通栏信息 */
        .top-bar {
            background-color: #F1F5F9;
            font-size: 12px;
            color: var(--text-muted);
            border-bottom: 1px solid var(--border);
            padding: 8px 0;
        }
        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
        }
        .top-bar-meta {
            display: flex;
            gap: 20px;
        }

        /* 双行沉浸式导航 */
        .header-nav {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            transition: var(--transition);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo span {
            color: var(--accent);
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 28px;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-heading);
            padding: 6px 0;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: var(--transition);
        }
        .nav-link:hover::after {
            width: 100%;
        }

        /* 统一按钮系统 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            font-weight: 600;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            cursor: pointer;
            transition: var(--transition);
            min-height: 44px;
            min-width: 44px;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
        }
        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(30, 64, 175, 0.25);
        }
        .btn-outline {
            background-color: transparent;
            border-color: var(--border);
            color: var(--text-heading);
        }
        .btn-outline:hover {
            background-color: #FFFFFF;
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-accent {
            background-color: var(--accent);
            color: #FFFFFF;
        }
        .btn-accent:hover {
            background-color: #0369A1;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: var(--radius-full);
            background: rgba(30, 64, 175, 0.08);
            color: var(--primary);
        }
        .badge-success {
            background: rgba(13, 148, 136, 0.1);
            color: var(--accent-teal);
        }

        /* 通用 section */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background-color: #FFFFFF;
        }
        .section-dark {
            background-color: var(--bg-dark);
            color: #F8FAFC;
        }
        .section-header {
            margin-bottom: 48px;
            max-width: 760px;
        }
        .section-header.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-heading);
            line-height: 1.3;
            margin-bottom: 14px;
        }
        .section-dark .section-title {
            color: #FFFFFF;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .section-dark .section-desc {
            color: #94A3B8;
        }

        /* 板块一：首屏 Hero（试用申请、权益徽章） */
        .hero-section {
            position: relative;
            background: linear-gradient(135deg, rgba(248, 250, 252, 0.94) 0%, rgba(239, 246, 255, 0.88) 100%),
                        url('/assets/images/52fb1f2d0bb92fd3.png') center/cover no-repeat;
            padding: 90px 0 100px;
            border-bottom: 1px solid var(--border);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 50px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 40px;
            font-weight: 800;
            color: var(--text-heading);
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-desc {
            font-size: 17px;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 30px;
        }
        .hero-perks {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 35px;
        }
        .hero-perk-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-heading);
            background: #FFFFFF;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .hero-card {
            background: #FFFFFF;
            padding: 36px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: 0 20px 40px -15px rgba(30, 64, 175, 0.15);
        }
        .hero-card-title {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 10px;
        }
        .hero-card-sub {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .form-group {
            margin-bottom: 18px;
        }
        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-heading);
        }
        .form-input, .form-select {
            width: 100%;
            padding: 12px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            font-size: 14px;
            color: var(--text-heading);
            background: #F8FAFC;
            outline: none;
            transition: var(--transition);
        }
        .form-input:focus, .form-select:focus {
            border-color: var(--primary);
            background: #FFFFFF;
            box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
        }

        /* 板块二：搜索与推流协议入口 */
        .search-entry-bar {
            background: #FFFFFF;
            padding: 24px 30px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: -40px;
            position: relative;
            z-index: 10;
        }
        .entry-tags {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .entry-title {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-heading);
        }
        .entry-tag-btn {
            font-size: 13px;
            padding: 6px 14px;
            background: #F1F5F9;
            border-radius: var(--radius-full);
            color: var(--text-body);
            border: 1px solid transparent;
        }
        .entry-tag-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #FFFFFF;
        }

        /* 痛点深度剖析网格 */
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            position: relative;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(30, 64, 175, 0.3);
        }
        .card-num {
            font-size: 28px;
            font-weight: 800;
            color: #CBD5E1;
            margin-bottom: 12px;
            line-height: 1;
        }
        .card-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 12px;
        }
        .card-text {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.65;
        }

        /* 分类矩阵 / 架构板块 */
        .matrix-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .matrix-card {
            background: #FFFFFF;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .matrix-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .matrix-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }
        .matrix-card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .matrix-badge {
            align-self: flex-start;
            margin-bottom: 10px;
        }
        .matrix-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-heading);
        }
        .matrix-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
            flex: 1;
            line-height: 1.6;
        }

        /* 精选清单板块 */
        .featured-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-box {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            padding: 30px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .feature-box:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .feature-tag {
            font-size: 12px;
            color: var(--accent);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 8px;
        }
        .feature-box-title {
            font-size: 19px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 12px;
        }
        .feature-box-desc {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.65;
            margin-bottom: 16px;
        }
        .feature-meta {
            border-top: 1px solid #F1F5F9;
            padding-top: 14px;
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 核心优势矩阵 6 宫格 */
        .grid-6 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .service-card {
            background: #FFFFFF;
            padding: 26px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .service-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }
        .service-icon-bar {
            width: 44px;
            height: 44px;
            background: rgba(30, 64, 175, 0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            font-size: 18px;
        }

        /* 技术理念深色对比区 */
        .dark-engine-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .engine-card {
            background: #1E293B;
            border: 1px solid #334155;
            border-radius: var(--radius-md);
            padding: 28px;
            margin-bottom: 16px;
        }
        .engine-card-title {
            font-size: 17px;
            font-weight: 700;
            color: #38BDF8;
            margin-bottom: 8px;
        }
        .engine-card-p {
            font-size: 14px;
            color: #CBD5E1;
            line-height: 1.6;
        }

        /* 标准化流程水平 4 步 */
        .steps-wrapper {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .step-item {
            background: #FFFFFF;
            padding: 26px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            position: relative;
            box-shadow: var(--shadow-sm);
        }
        .step-badge {
            display: inline-block;
            font-size: 13px;
            font-weight: 800;
            background: var(--primary);
            color: #FFFFFF;
            padding: 4px 10px;
            border-radius: var(--radius-sm);
            margin-bottom: 14px;
        }
        .step-name {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 8px;
        }
        .step-txt {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 排行与关键指标板块 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            background: #FFFFFF;
            padding: 32px 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        .stat-value {
            font-size: 40px;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 8px;
            font-feature-settings: "tnum";
        }
        .stat-label {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-heading);
            margin-bottom: 4px;
        }
        .stat-desc {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 真实案例应用卡片 */
        .case-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        .case-card {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .case-img {
            height: 220px;
            width: 100%;
            object-fit: cover;
        }
        .case-body {
            padding: 26px;
        }
        .case-title {
            font-size: 19px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 10px;
        }
        .case-desc {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.65;
            margin-bottom: 16px;
        }

        /* 行业口碑评价 */
        .feedback-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feedback-card {
            background: #FFFFFF;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow-sm);
        }
        .feedback-quote {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 18px;
            font-style: normal;
        }
        .feedback-author {
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid #F1F5F9;
            padding-top: 14px;
        }
        .author-avatar {
            width: 40px;
            height: 40px;
            background: #E2E8F0;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
        }
        .author-info h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-heading);
        }
        .author-info p {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 技术资讯 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .news-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .news-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-summary {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
            margin-bottom: 16px;
            flex: 1;
        }

        /* 答疑折叠 FAQ */
        .faq-accordion {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
        }
        .faq-question {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-heading);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #FFFFFF;
            user-select: none;
        }
        .faq-question:hover {
            color: var(--primary);
            background: #F8FAFC;
        }
        .faq-icon {
            font-size: 18px;
            font-weight: 400;
            transition: var(--transition);
        }
        .faq-answer {
            padding: 0 24px 18px 24px;
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
            display: none;
            border-top: 1px solid #F1F5F9;
            padding-top: 14px;
        }
        .faq-item.active .faq-answer {
            display: block;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        /* 转化卡片 CTA */
        .cta-banner {
            background: linear-gradient(135deg, #1E40AF 0%, #0369A1 100%);
            border-radius: var(--radius-md);
            padding: 60px 40px;
            color: #FFFFFF;
            text-align: center;
            box-shadow: 0 20px 40px -10px rgba(30, 64, 175, 0.3);
        }
        .cta-title {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-desc {
            font-size: 16px;
            color: #E0F2FE;
            max-width: 680px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        /* 页脚系统 */
        .footer {
            background: #0F172A;
            color: #94A3B8;
            padding: 70px 0 30px;
            font-size: 14px;
            border-top: 1px solid #1E293B;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 50px;
        }
        .footer-brand h3 {
            font-size: 20px;
            font-weight: 800;
            color: #FFFFFF;
            margin-bottom: 14px;
        }
        .footer-brand p {
            line-height: 1.7;
            margin-bottom: 16px;
            color: #64748B;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 18px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: #38BDF8;
        }
        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 13px;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .grid-4, .grid-6, .steps-wrapper, .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-grid, .dark-engine-grid {
                grid-template-columns: 1fr;
            }
            .matrix-grid, .featured-list, .news-grid, .feedback-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .top-bar {
                display: none;
            }
            .nav-inner {
                height: 60px;
            }
            .nav-links {
                display: none; /* 移动端精简处理保证触控与版面整洁 */
            }
            .hero-section {
                padding: 40px 0 60px;
            }
            .hero-content h1 {
                font-size: 28px;
            }
            .section {
                padding: 50px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .grid-4, .grid-6, .steps-wrapper, .stats-grid, .matrix-grid, .featured-list, .case-grid, .news-grid, .feedback-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }