/* roulang page: index */
:root {
            --bg-body: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-dark: #0B0F19;
            --bg-dark-card: #151D2F;
            --primary: #0F172A;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --text-light: #94A3B8;
            --accent-green: #059669;
            --accent-green-bg: #ECFDF5;
            --accent-blue: #2563EB;
            --accent-blue-bg: #EFF6FF;
            --border-light: #E2E8F0;
            --border-dark: #1E293B;
            --border-dark-hover: #334155;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
            --radius-md: 6px;
            --radius-lg: 10px;
            --radius-xl: 14px;
            --max-w: 1240px;
            --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
        }

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

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

        body {
            overflow-x: hidden;
            width: 100%;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }

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

        button, input, select, textarea {
            font-family: inherit;
            font-size: 100%;
        }

        .container {
            width: 100%;
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部微型信息条 */
        .top-utility-bar {
            background-color: #080D1A;
            color: #94A3B8;
            font-size: 12px;
            border-bottom: 1px solid #1E293B;
            padding: 7px 0;
        }
        .top-utility-bar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .badge-verified {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: #10B981;
            font-weight: 500;
        }
        .badge-verified::before {
            content: '';
            width: 6px;
            height: 6px;
            background-color: #10B981;
            border-radius: 50%;
            box-shadow: 0 0 6px #10B981;
        }
        .utility-links {
            display: flex;
            gap: 20px;
        }
        .utility-links span {
            color: #64748B;
        }

        /* 主导航条 */
        .main-header {
            position: sticky;
            top: 0;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--primary);
        }
        .logo-symbol {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, #0F172A 0%, #2563EB 100%);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #FFFFFF;
            font-weight: 800;
            font-size: 16px;
            box-shadow: 0 2px 4px rgba(37,99,235,0.2);
        }
        .desktop-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav-link {
            font-size: 14px;
            font-weight: 500;
            color: #475569;
            transition: color 0.15s ease;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--accent-blue);
        }
        .btn-nav {
            background-color: var(--primary);
            color: #FFFFFF;
            font-size: 13px;
            font-weight: 600;
            padding: 9px 18px;
            border-radius: var(--radius-md);
            border: 1px solid transparent;
            transition: all 0.2s ease;
            box-shadow: var(--shadow-sm);
        }
        .btn-nav:hover {
            background-color: #1E293B;
            transform: translateY(-1px);
        }

        /* 移动端汉堡菜单 */
        .mobile-toggle {
            display: none;
            width: 44px;
            height: 44px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 10px;
            flex-direction: column;
            justify-content: space-around;
        }
        .mobile-toggle span {
            width: 100%;
            height: 2px;
            background-color: var(--primary);
            transition: 0.3s;
        }

        /* 通用按钮 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            padding: 13px 26px;
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            text-align: center;
            border: 1px solid transparent;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
        }
        .btn-primary:hover {
            background-color: #1E293B;
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .btn-outline {
            background-color: #FFFFFF;
            color: var(--primary);
            border-color: var(--border-light);
        }
        .btn-outline:hover {
            background-color: #F1F5F9;
            border-color: #CBD5E1;
            transform: translateY(-2px);
        }
        .btn-accent {
            background-color: var(--accent-blue);
            color: #FFFFFF;
        }
        .btn-accent:hover {
            background-color: #1D4ED8;
            box-shadow: 0 4px 12px rgba(37,99,235,0.25);
            transform: translateY(-2px);
        }

        /* 通用板块与排版 */
        .section-py {
            padding: 88px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .section-header {
            max-width: 760px;
            margin: 0 auto 52px;
            text-align: center;
        }
        .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            color: var(--accent-blue);
            background-color: var(--accent-blue-bg);
            padding: 5px 12px;
            border-radius: 9999px;
            margin-bottom: 14px;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--primary);
            line-height: 1.25;
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 1. HERO 首屏轮播式 Banner */
        .hero-section {
            position: relative;
            background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
            padding: 60px 0 80px;
            overflow: hidden;
            border-bottom: 1px solid var(--border-light);
        }
        .hero-banner-inner {
            position: relative;
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-light);
            background-color: #0F172A;
            min-height: 540px;
            display: flex;
            align-items: center;
        }
        .hero-bg-media {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.35;
            filter: contrast(110%);
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(11,15,25,0.92) 0%, rgba(15,23,42,0.75) 50%, rgba(11,15,25,0.6) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            padding: 64px 56px;
            max-width: 820px;
            color: #FFFFFF;
        }
        .hero-h1 {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.025em;
            margin-bottom: 22px;
        }
        .hero-intro-lead {
            font-size: 17px;
            line-height: 1.8;
            color: #CBD5E1;
            margin-bottom: 34px;
        }
        .hero-cta-group {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* 2. 技术概览 (非对称双列) */
        .intro-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 52px;
            align-items: center;
        }
        .spec-table {
            width: 100%;
            margin-top: 24px;
            border-collapse: collapse;
            font-size: 14px;
        }
        .spec-table th, .spec-table td {
            padding: 12px 14px;
            border-bottom: 1px solid var(--border-light);
            text-align: left;
        }
        .spec-table th {
            color: var(--text-muted);
            font-weight: 500;
            width: 32%;
        }
        .spec-table td {
            font-family: var(--font-mono);
            color: var(--primary);
            font-weight: 600;
        }
        .intro-visual {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 20px;
            box-shadow: var(--shadow-md);
        }
        .intro-visual img {
            border-radius: var(--radius-md);
            width: 100%;
            height: 340px;
            object-fit: cover;
        }

        /* 3. 核心安全矩阵 (6 卡片网格) */
        .security-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .security-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 30px 26px;
            transition: all 0.2s ease;
        }
        .security-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
            border-color: #CBD5E1;
        }
        .security-icon {
            width: 44px;
            height: 44px;
            border-radius: 8px;
            background-color: #F1F5F9;
            color: var(--accent-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 20px;
        }
        .security-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--primary);
        }
        .security-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.65;
        }

        /* 4. 产品与方案矩阵 (3 深度卡片) */
        .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .solution-card {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-sm);
            transition: border-color 0.2s ease, transform 0.2s ease;
        }
        .solution-card:hover {
            border-color: var(--accent-blue);
            transform: translateY(-3px);
        }
        .solution-card img {
            height: 200px;
            width: 100%;
            object-fit: cover;
        }
        .solution-body {
            padding: 28px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .solution-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .solution-body p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
            line-height: 1.6;
        }
        .spec-list {
            list-style: none;
            margin-bottom: 24px;
            margin-top: auto;
        }
        .spec-list li {
            font-size: 13px;
            color: #475569;
            padding: 6px 0;
            border-top: 1px dashed var(--border-light);
            display: flex;
            justify-content: space-between;
        }
        .spec-list li span:last-child {
            font-family: var(--font-mono);
            font-weight: 600;
            color: var(--primary);
        }

        /* 5. 深色架构展示板块 (防盲签引擎) */
        .dark-architect-section {
            background-color: var(--bg-dark);
            color: #FFFFFF;
            border-bottom: 1px solid #1E293B;
            padding: 96px 0;
        }
        .dark-architect-section .section-title {
            color: #FFFFFF;
        }
        .dark-architect-section .section-desc {
            color: var(--text-light);
        }
        .architect-terminal {
            background-color: var(--bg-dark-card);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-lg);
            padding: 32px;
            margin-top: 40px;
            font-family: var(--font-mono);
        }
        .terminal-header {
            display: flex;
            align-items: center;
            gap: 8px;
            padding-bottom: 18px;
            border-bottom: 1px solid var(--border-dark);
            margin-bottom: 20px;
            font-size: 13px;
            color: #94A3B8;
        }
        .circle { width: 10px; height: 10px; border-radius: 50%; }
        .circle-red { background-color: #EF4444; }
        .circle-yellow { background-color: #F59E0B; }
        .circle-green { background-color: #10B981; }
        .terminal-code {
            font-size: 13px;
            line-height: 1.8;
            color: #E2E8F0;
            overflow-x: auto;
        }
        .code-kw { color: #38BDF8; }
        .code-fn { color: #A855F7; }
        .code-str { color: #34D399; }
        .code-comment { color: #64748B; font-style: italic; }

        /* 6. 端到端工作流程 (4步横向) */
        .workflow-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .workflow-step {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 26px 20px;
            position: relative;
        }
        .step-num {
            font-size: 12px;
            font-weight: 800;
            font-family: var(--font-mono);
            background-color: #F1F5F9;
            color: var(--accent-blue);
            width: 28px;
            height: 28px;
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }
        .workflow-step h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 10px;
        }
        .workflow-step p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 7. 案例研讨 (双列对比) */
        .case-study-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .case-card {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 34px;
            box-shadow: var(--shadow-sm);
        }
        .case-badge {
            font-size: 12px;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
            background-color: #F1F5F9;
            color: var(--primary);
            display: inline-block;
            margin-bottom: 16px;
        }
        .case-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 14px;
        }
        .case-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .case-kpi {
            background-color: #F8FAFC;
            border-radius: var(--radius-md);
            padding: 14px 18px;
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            border: 1px solid var(--border-light);
        }
        .case-kpi strong {
            color: var(--accent-green);
            font-family: var(--font-mono);
            font-size: 15px;
        }

        /* 8. 全网验签指标统计条 */
        .metrics-strip {
            background-color: #0F172A;
            color: #FFFFFF;
            padding: 48px 0;
            border-bottom: 1px solid #1E293B;
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .metric-item-num {
            font-size: 38px;
            font-weight: 800;
            letter-spacing: -0.02em;
            font-family: var(--font-mono);
            color: #FFFFFF;
            margin-bottom: 6px;
        }
        .metric-item-num span {
            color: var(--accent-green);
        }
        .metric-item-lbl {
            font-size: 13px;
            color: #94A3B8;
            font-weight: 500;
        }

        /* 9. 安全评审与机构评价 */
        .feedbacks-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feedback-card {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 28px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .feedback-text {
            font-size: 14px;
            color: #334155;
            line-height: 1.7;
            margin-bottom: 24px;
            position: relative;
        }
        .reviewer-info {
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid #F1F5F9;
            padding-top: 16px;
        }
        .reviewer-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: #E2E8F0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
            color: var(--primary);
        }
        .reviewer-meta h5 {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
        }
        .reviewer-meta span {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 10. 签名安全前沿资讯 */
        .insights-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .insight-card {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .insight-card img {
            height: 180px;
            width: 100%;
            object-fit: cover;
        }
        .insight-body {
            padding: 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .insight-meta {
            font-size: 12px;
            color: var(--accent-blue);
            font-weight: 600;
            margin-bottom: 10px;
        }
        .insight-body h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .insight-body p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 18px;
        }
        .insight-action {
            margin-top: auto;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* 11. FAQ 手风琴 */
        .faq-accordion-list {
            max-width: 840px;
            margin: 0 auto;
        }
        details.faq-item {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            overflow: hidden;
            transition: all 0.2s ease;
        }
        details.faq-item[open] {
            border-color: #CBD5E1;
            box-shadow: var(--shadow-sm);
        }
        summary.faq-question {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        summary.faq-question::-webkit-details-marker {
            display: none;
        }
        summary.faq-question::after {
            content: "+";
            font-size: 20px;
            color: var(--text-muted);
            font-weight: 400;
            transition: transform 0.2s ease;
        }
        details[open] summary.faq-question::after {
            content: "−";
        }
        .faq-answer {
            padding: 0 24px 22px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            border-top: 1px solid #F1F5F9;
            padding-top: 16px;
        }

        /* 12. 转化区与技术咨询表单 */
        .cta-box-wrapper {
            background-color: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 56px;
            box-shadow: var(--shadow-lg);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }
        .cta-info h3 {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .cta-info p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 28px;
        }
        .form-row {
            margin-bottom: 16px;
        }
        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: #334155;
            margin-bottom: 6px;
        }
        .form-input {
            width: 100%;
            padding: 11px 14px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            font-size: 14px;
            background-color: #F8FAFC;
            transition: border-color 0.2s;
        }
        .form-input:focus {
            outline: none;
            border-color: var(--accent-blue);
            background-color: #FFFFFF;
        }
        .form-submit-btn {
            width: 100%;
            background-color: var(--accent-blue);
            color: #FFFFFF;
            padding: 12px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-md);
            border: none;
            cursor: pointer;
            transition: background-color 0.2s;
        }
        .form-submit-btn:hover {
            background-color: #1D4ED8;
        }

        /* 页脚体系 */
        .site-footer {
            background-color: #080D1A;
            color: #94A3B8;
            font-size: 13px;
            padding: 72px 0 32px;
            border-top: 1px solid #1E293B;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.8fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 48px;
        }
        .footer-brand h4 {
            font-size: 18px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand p {
            line-height: 1.7;
            color: #64748B;
            font-size: 13px;
        }
        .footer-col h5 {
            font-size: 14px;
            font-weight: 600;
            color: #E2E8F0;
            margin-bottom: 18px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            padding-top: 28px;
            border-top: 1px solid #1E293B;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: #64748B;
        }

        /* 响应式断点处理 */
        @media (max-width: 1024px) {
            .security-grid, .solution-grid, .feedbacks-grid, .insights-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .workflow-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .intro-grid, .cta-box-wrapper, .case-study-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }
        }

        @media (max-width: 768px) {
            .desktop-nav, .btn-nav {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .hero-content {
                padding: 40px 24px;
            }
            .hero-h1 {
                font-size: 32px;
            }
            .security-grid, .solution-grid, .feedbacks-grid, .insights-grid, .workflow-row, .case-study-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
            .cta-box-wrapper {
                padding: 32px 20px;
            }
            .section-py {
                padding: 60px 0;
            }
        }