/* roulang page: index */
:root {
            --bg-base: #F8F9FA;
            --bg-surface: #FFFFFF;
            --bg-dark: #0B132B;
            --primary: #0F1E36;
            --accent: #00A896;
            --accent-hover: #028e7e;
            --warning: #E65100;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --text-light: #94A3B8;
            --border-color: #E2E8F0;
            --border-dark: #1E293B;
            --radius-sm: 4px;
            --radius-md: 6px;
            --container-w: 1240px;
            --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            --shadow-subtle: 0 10px 25px -5px rgba(15, 30, 54, 0.08);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-main);
            line-height: 1.7;
            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
        }
        .container {
            width: 100%;
            max-width: var(--container-w);
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section-header {
            margin-bottom: 56px;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 12px;
        }
        .section-tag::before {
            content: "";
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--accent);
            display: inline-block;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.3;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 780px;
            line-height: 1.7;
        }
        .sub-header {
            height: 36px;
            background-color: #EEF2F6;
            font-size: 12px;
            color: #475569;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
        }
        .sub-header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        .status-dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            background-color: var(--accent);
            border-radius: 50%;
            margin-right: 6px;
        }
        .main-header {
            position: sticky;
            top: 0;
            z-index: 999;
            height: 72px;
            background-color: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
        }
        .nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.01em;
        }
        .logo-symbol {
            width: 28px;
            height: 28px;
            background: var(--primary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-link {
            font-size: 14px;
            font-weight: 500;
            color: #334155;
            position: relative;
            padding: 8px 0;
        }
        .nav-link:hover {
            color: var(--accent);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition-fast);
            border: 1px solid transparent;
            text-align: center;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
        }
        .btn-primary:hover {
            background-color: #172a4c;
            box-shadow: var(--shadow-subtle);
        }
        .btn-accent {
            background-color: var(--accent);
            color: #FFFFFF;
        }
        .btn-accent:hover {
            background-color: var(--accent-hover);
        }
        .btn-outline {
            background-color: transparent;
            border-color: var(--border-color);
            color: var(--primary);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            background-color: #F1F5F9;
        }
        .mobile-menu-btn {
            display: none;
            background: transparent;
            border: none;
            font-size: 20px;
            color: var(--primary);
            cursor: pointer;
            padding: 8px;
        }
        .hero-section {
            background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
            padding: 80px 0 96px;
            border-bottom: 1px solid var(--border-color);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 56px;
            align-items: center;
        }
        .hero-h1 {
            font-size: 42px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--primary);
            letter-spacing: -0.03em;
            margin-bottom: 20px;
        }
        .hero-desc {
            font-size: 16px;
            color: #475569;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 40px;
        }
        .hero-trust-bar {
            display: flex;
            align-items: center;
            gap: 24px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }
        .trust-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 500;
            color: #64748B;
        }
        .hero-visual-frame {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 12px;
            box-shadow: 0 20px 40px -15px rgba(15, 30, 54, 0.12);
            position: relative;
        }
        .visual-img {
            border-radius: var(--radius-sm);
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .frame-status-tag {
            position: absolute;
            top: 24px;
            right: 24px;
            background: rgba(11, 19, 43, 0.85);
            backdrop-filter: blur(4px);
            color: #FFFFFF;
            font-size: 12px;
            padding: 6px 14px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .section-pad {
            padding: 96px 0;
        }
        .bg-white {
            background-color: var(--bg-surface);
        }
        .bg-alt {
            background-color: #F8FAFC;
        }
        .overview-grid {
            display: grid;
            grid-template-columns: 4fr 6fr;
            gap: 48px;
            align-items: center;
        }
        .params-sheet {
            background: #F8FAFC;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
        }
        .param-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 0;
            border-bottom: 1px solid #EDF2F7;
            font-size: 14px;
        }
        .param-row:last-child {
            border-bottom: none;
        }
        .param-label {
            color: var(--text-muted);
            font-weight: 500;
        }
        .param-value {
            color: var(--primary);
            font-weight: 600;
        }
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1px;
            background-color: var(--border-color);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
        }
        .adv-card {
            background: #FFFFFF;
            padding: 36px 30px;
            transition: background var(--transition-fast);
        }
        .adv-card:hover {
            background-color: #F8FAFC;
        }
        .adv-index {
            font-size: 13px;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .adv-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .adv-text {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .products-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .product-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            transition: transform var(--transition-fast), box-shadow var(--transition-fast);
        }
        .product-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-subtle);
        }
        .product-media {
            height: 220px;
            background: #EDF2F7;
            overflow: hidden;
        }
        .product-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .product-body {
            padding: 24px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .product-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .product-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
            flex-grow: 1;
        }
        .spec-list {
            list-style: none;
            margin-bottom: 24px;
            border-top: 1px solid #EDF2F7;
            padding-top: 16px;
        }
        .spec-item {
            font-size: 13px;
            color: #475569;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .spec-item::before {
            content: "▪";
            color: var(--accent);
        }
        .section-dark {
            background-color: var(--bg-dark);
            color: #FFFFFF;
        }
        .section-dark .section-title {
            color: #FFFFFF;
        }
        .section-dark .section-desc {
            color: #94A3B8;
        }
        .timeline-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .dark-content-block {
            padding-right: 24px;
        }
        .timeline-list {
            border-left: 2px solid rgba(255, 255, 255, 0.1);
            padding-left: 32px;
            position: relative;
        }
        .timeline-node {
            position: relative;
            margin-bottom: 36px;
        }
        .timeline-node:last-child {
            margin-bottom: 0;
        }
        .node-pin {
            position: absolute;
            left: -39px;
            top: 4px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--accent);
            border: 3px solid var(--bg-dark);
        }
        .node-phase {
            font-size: 13px;
            color: var(--accent);
            font-weight: 600;
            margin-bottom: 6px;
        }
        .node-title {
            font-size: 17px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 8px;
        }
        .node-desc {
            font-size: 14px;
            color: #94A3B8;
            line-height: 1.6;
        }
        .tab-nav {
            display: flex;
            gap: 12px;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 36px;
            overflow-x: auto;
            padding-bottom: 4px;
        }
        .tab-btn {
            background: transparent;
            border: none;
            padding: 12px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-muted);
            cursor: pointer;
            border-bottom: 2px solid transparent;
            margin-bottom: -5px;
            white-space: nowrap;
        }
        .tab-btn.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .solution-card-box {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            display: grid;
            grid-template-columns: 1fr 1fr;
        }
        .solution-body {
            padding: 44px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .solution-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .solution-text {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .metrics-bar {
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 56px 0;
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .metric-item {
            border-left: 1px solid var(--border-color);
            padding-left: 28px;
        }
        .metric-num {
            font-size: 44px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.1;
            letter-spacing: -0.02em;
            margin-bottom: 8px;
        }
        .metric-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
        }
        .reviews-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .review-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 36px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
        }
        .review-quote {
            font-size: 15px;
            color: #334155;
            line-height: 1.8;
            margin-bottom: 24px;
            font-style: normal;
        }
        .reviewer-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            border-top: 1px solid #EDF2F7;
            padding-top: 18px;
        }
        .reviewer-badge {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #EEF2F6;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
        }
        .reviewer-name {
            font-size: 14px;
            font-weight: 700;
            color: var(--primary);
        }
        .reviewer-org {
            font-size: 13px;
            color: var(--text-light);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .news-date {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            margin-bottom: 12px;
        }
        .news-h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.5;
            margin-bottom: 12px;
        }
        .news-summary {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .news-footer-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            margin-top: 36px;
        }
        .faq-wrapper {
            max-width: 840px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            background: #FFFFFF;
            margin-bottom: 16px;
            overflow: hidden;
        }
        .faq-summary {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 700;
            color: var(--primary);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            min-height: 48px;
        }
        .faq-summary::-webkit-details-marker {
            display: none;
        }
        .faq-summary::after {
            content: "+";
            font-size: 20px;
            font-weight: 400;
            color: var(--text-muted);
        }
        details[open] .faq-summary::after {
            content: "−";
        }
        .faq-content {
            padding: 0 24px 20px 24px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
            border-top: 1px solid #F1F5F9;
            padding-top: 16px;
        }
        .guarantee-bar {
            background: #F8FAFC;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 40px 0;
        }
        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .guarantee-card {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .guarantee-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: #E2E8F0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
            flex-shrink: 0;
        }
        .guarantee-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 2px;
        }
        .guarantee-desc {
            font-size: 13px;
            color: var(--text-muted);
        }
        .contact-box {
            background-color: var(--primary);
            color: #FFFFFF;
            border-radius: var(--radius-md);
            padding: 56px 48px;
            display: grid;
            grid-template-columns: 1fr 1.1fr;
            gap: 56px;
        }
        .contact-info .section-title {
            color: #FFFFFF;
            margin-bottom: 20px;
        }
        .contact-info p {
            color: #94A3B8;
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .expert-hotline {
            font-size: 24px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 8px;
        }
        .contact-form {
            background: #FFFFFF;
            border-radius: var(--radius-sm);
            padding: 32px;
            color: var(--text-main);
        }
        .form-group {
            margin-bottom: 18px;
        }
        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #334155;
        }
        .form-input, .form-select {
            width: 100%;
            height: 44px;
            padding: 0 14px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 14px;
            color: var(--text-main);
            outline: none;
            transition: border-color var(--transition-fast);
        }
        .form-input:focus, .form-select:focus {
            border-color: var(--accent);
        }
        .site-footer {
            background-color: #0B132B;
            color: #94A3B8;
            padding: 80px 0 0;
            font-size: 14px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 48px;
            margin-bottom: 64px;
        }
        .footer-col-title {
            color: #FFFFFF;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 20px;
        }
        .footer-nav {
            list-style: none;
        }
        .footer-nav li {
            margin-bottom: 12px;
        }
        .footer-nav a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 24px 0;
            font-size: 13px;
            color: #64748B;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-bottom a {
            color: #64748B;
        }
        .footer-bottom a:hover {
            color: #94A3B8;
        }
        @media (max-width: 1024px) {
            .hero-grid, .overview-grid, .timeline-grid, .solution-card-box, .contact-box {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .products-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .guarantee-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }
        }
        @media (max-width: 768px) {
            .sub-header {
                display: none;
            }
            .main-header {
                height: 64px;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-menu {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: #FFFFFF;
                flex-direction: column;
                align-items: flex-start;
                padding: 24px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 20px rgba(0,0,0,0.05);
                display: none;
            }
            .nav-menu.active {
                display: flex;
            }
            .header-cta-btn {
                display: none;
            }
            .section-pad {
                padding: 56px 0;
            }
            .hero-section {
                padding: 48px 0 56px;
            }
            .hero-h1 {
                font-size: 28px;
            }
            .section-title {
                font-size: 24px;
            }
            .advantages-grid, .products-grid, .news-grid, .reviews-grid {
                grid-template-columns: 1fr;
            }
            .metrics-grid, .guarantee-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .contact-box {
                padding: 32px 20px;
            }
            .contact-form {
                padding: 20px;
            }
            .metric-item {
                border-left: none;
                border-top: 1px solid var(--border-color);
                padding-left: 0;
                padding-top: 16px;
            }
        }