/* roulang page: index */
:root {
            --bg-page: #F8FAFC;
            --bg-white: #FFFFFF;
            --bg-alt: #F1F5F9;
            --bg-dark: #0F172A;
            --brand-primary: #1E40AF;
            --brand-primary-hover: #1D4ED8;
            --brand-accent: #0284C7;
            --text-title: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
            --border-subtle: #F1F5F9;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
            --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
            --shadow-glow: 0 0 20px rgba(30, 64, 175, 0.2);
            --transition: all 0.3s ease-out;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-page);
            color: var(--text-body);
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

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

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

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }

        .container {
            width: 100%;
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .section-py {
            padding-top: 88px;
            padding-bottom: 88px;
        }

        .section-header {
            margin-bottom: 56px;
        }

        .section-header.text-center {
            text-align: center;
            max-width: 820px;
            margin-left: auto;
            margin-right: auto;
            margin-bottom: 56px;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            background-color: #EFF6FF;
            color: var(--brand-primary);
            font-size: 0.85rem;
            font-weight: 600;
            border-radius: var(--radius-full);
            margin-bottom: 16px;
            border: 1px solid #DBEAFE;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--text-title);
            line-height: 1.3;
            letter-spacing: -0.02em;
            margin-bottom: 18px;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 28px;
            font-weight: 600;
            border-radius: var(--radius-full);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
            color: var(--bg-white);
            box-shadow: 0 4px 14px rgba(30, 64, 175, 0.25);
        }

        .btn-primary:hover {
            box-shadow: 0 6px 20px rgba(30, 64, 175, 0.35);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background-color: var(--bg-white);
            color: var(--brand-primary);
            border: 1px solid #BFDBFE;
        }

        .btn-secondary:hover {
            background-color: #F8FAFC;
            border-color: var(--brand-primary);
            transform: translateY(-2px);
        }

        /* Top Bar */
        .top-bar {
            background-color: #F8FAFC;
            border-bottom: 1px solid var(--border-light);
            font-size: 0.82rem;
            color: var(--text-muted);
            padding: 8px 0;
        }
        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-contact-list {
            display: flex;
            gap: 24px;
            list-style: none;
        }

        /* Sticky Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 3px rgba(0,0,0,0.02);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--brand-primary);
            letter-spacing: -0.01em;
        }
        .brand-logo-mark {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 900;
            font-size: 1.1rem;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--brand-primary);
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            font-size: 1.5rem;
            color: var(--text-title);
        }

        /* Hero Section */
        .hero-section {
            position: relative;
            background-color: #FFFFFF;
            overflow: hidden;
            padding: 70px 0 90px;
            border-bottom: 1px solid var(--border-light);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 48px;
            align-items: center;
        }
        .hero-title {
            font-size: 2.85rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-title);
            margin-bottom: 24px;
        }
        .hero-title span {
            background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-lead {
            font-size: 1.12rem;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            margin-bottom: 36px;
        }
        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            font-size: 0.88rem;
            color: var(--text-muted);
        }
        .hero-badge-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .hero-panel-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .survey-preview-badge {
            background: #EFF6FF;
            color: var(--brand-primary);
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 0.78rem;
            font-weight: 700;
            display: inline-block;
            margin-bottom: 16px;
        }
        .survey-options {
            display: grid;
            gap: 12px;
            margin-bottom: 24px;
        }
        .survey-option-item {
            border: 1px solid var(--border-light);
            padding: 12px 16px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.92rem;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }
        .survey-option-item:hover, .survey-option-item.selected {
            border-color: var(--brand-primary);
            background-color: #F8FAFC;
        }

        /* 12 个板块通用卡片与布局 */
        .card-panel {
            background-color: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .card-panel:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        /* 板块二：架构剖析 */
        .arch-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .arch-metrics-box {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-top: 24px;
        }
        .metric-cell {
            background-color: var(--bg-alt);
            padding: 20px;
            border-radius: var(--radius-md);
            border-left: 4px solid var(--brand-primary);
        }
        .metric-val {
            font-size: 1.7rem;
            font-weight: 800;
            color: var(--brand-primary);
            margin-bottom: 4px;
        }
        .metric-lbl {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* 板块三：6卡片网格 */
        .grid-3-col {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-icon-box {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: #EFF6FF;
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 800;
            margin-bottom: 20px;
        }
        .feature-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-title);
            margin-bottom: 12px;
        }

        /* 板块四：3卡套件 */
        .suite-card {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .suite-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .suite-card.highlight {
            border: 2px solid var(--brand-primary);
            box-shadow: var(--shadow-glow);
        }
        .suite-card.highlight::before {
            content: "推荐配置";
            position: absolute;
            top: -14px;
            right: 28px;
            background: var(--brand-primary);
            color: #fff;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 700;
        }
        .suite-price-tier {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--brand-primary);
            margin: 16px 0;
        }
        .suite-features-list {
            list-style: none;
            margin: 20px 0 28px;
            font-size: 0.95rem;
        }
        .suite-features-list li {
            padding: 8px 0;
            border-bottom: 1px dashed var(--border-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* 板块五：深色案例理念 */
        .section-dark {
            background-color: var(--bg-dark);
            color: #F8FAFC;
        }
        .section-dark .section-title {
            color: #FFFFFF;
        }
        .section-dark .section-desc {
            color: #94A3B8;
        }
        .dark-content-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .dark-tech-spec {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-md);
            padding: 28px;
        }
        .dark-tech-item {
            margin-bottom: 20px;
        }
        .dark-tech-item:last-child {
            margin-bottom: 0;
        }
        .dark-tech-title {
            color: #38BDF8;
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        /* 板块六：标杆故事 */
        .grid-2-col {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .story-img-wrap {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 20px;
            height: 220px;
        }
        .story-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* 板块七：关键数据条 */
        .stats-strip {
            background-color: var(--bg-alt);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
            padding: 56px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-figure {
            font-size: 3rem;
            font-weight: 800;
            color: var(--brand-primary);
            line-height: 1.1;
            margin-bottom: 8px;
            font-feature-settings: "tnum";
        }
        .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 板块八：用户评价 */
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-top: 24px;
            border-top: 1px solid var(--border-light);
            padding-top: 16px;
        }
        .author-avatar {
            width: 44px;
            height: 44px;
            background-color: #E2E8F0;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--brand-primary);
        }
        .author-role {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* 板块九：资讯内嵌 */
        .news-date-badge {
            font-size: 0.8rem;
            color: var(--brand-accent);
            font-weight: 600;
            margin-bottom: 8px;
        }

        /* 板块十：FAQ 手风琴 */
        .faq-accordion {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .faq-header {
            padding: 20px 24px;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-title);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-body {
            padding: 0 24px 22px;
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-body {
            display: block;
        }
        .faq-icon {
            font-size: 1.25rem;
            color: var(--brand-primary);
            transition: var(--transition);
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        /* 板块十一：品质保障条 */
        .guarantee-bar {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .guarantee-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }
        .guarantee-icon {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background: #EFF6FF;
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-weight: 700;
        }

        /* 板块十二：主转化表单 */
        .contact-box {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 48px;
            box-shadow: var(--shadow-hover);
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 48px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-label {
            display: block;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 8px;
        }
        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-light);
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--brand-primary);
            box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
        }
        .form-disclaimer {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 14px;
            line-height: 1.5;
        }

        /* 全局 Footer */
        .site-footer {
            background-color: var(--bg-dark);
            color: #94A3B8;
            padding: 80px 0 36px;
            border-top: 1px solid #1E293B;
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 60px;
        }
        .footer-brand-title {
            color: #FFFFFF;
            font-size: 1.25rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .footer-col-title {
            color: #FFFFFF;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 20px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-links a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .hero-grid, .arch-layout, .dark-content-grid, .contact-box {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .grid-3-col {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 36px;
            }
            .guarantee-bar {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .top-bar {
                display: none;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: #FFFFFF;
                flex-direction: column;
                padding: 24px;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-card);
                gap: 18px;
            }
            .nav-menu.open {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .grid-3-col, .grid-2-col {
                grid-template-columns: 1fr;
            }
            .guarantee-bar {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 14px;
                text-align: center;
            }
            .hero-title {
                font-size: 2.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .contact-box {
                padding: 24px;
            }
        }