/* roulang page: index */
:root {
      --bg-primary: #f8fafc;
      --bg-secondary: #ffffff;
      --bg-dark: #0f172a;
      --bg-dark-surface: #1e293b;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #94a3b8;
      --brand-blue: #0284c7;
      --brand-blue-hover: #0369a1;
      --brand-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --accent-emerald: #10b981;
      --border-color: #e2e8f0;
      --border-dark: #334155;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 25px -3px rgba(0, 0, 0, 0.07), 0 4px 10px -2px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 35px -5px rgba(0, 0, 0, 0.1), 0 10px 15px -5px rgba(0, 0, 0, 0.04);
      --transition: all 0.25s ease-out;
    }

    *, *::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-primary);
      color: var(--text-main);
      line-height: 1.68;
    }

    body {
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section {
      padding: 96px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-secondary);
    }

    .section-dark {
      background-color: var(--bg-dark);
      color: #f8fafc;
    }

    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 56px;
    }

    .section-header h2 {
      font-size: 34px;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .section-dark .section-header h2 {
      color: #ffffff;
    }

    .section-header p {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.75;
    }

    .section-dark .section-header p {
      color: var(--text-light);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 14px;
      border-radius: 9999px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 14px;
      background: rgba(2, 132, 199, 0.1);
      color: var(--brand-blue);
      border: 1px solid rgba(2, 132, 199, 0.2);
    }

    .section-dark .badge {
      background: rgba(6, 182, 212, 0.15);
      color: var(--brand-cyan);
      border-color: rgba(6, 182, 212, 0.3);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 13px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--brand-blue);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
    }

    .btn-primary:hover {
      background: var(--brand-blue-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(2, 132, 199, 0.4);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }

    .btn-outline:hover {
      background: #f1f5f9;
      border-color: #cbd5e1;
    }

    .btn-white {
      background: #ffffff;
      color: var(--bg-dark);
    }

    .btn-white:hover {
      background: #f8fafc;
      transform: translateY(-2px);
    }

    /* Top Bar & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    .top-notice-bar {
      background: var(--bg-dark);
      color: #cbd5e1;
      font-size: 12px;
      padding: 6px 0;
      border-bottom: 1px solid #1e293b;
    }

    .top-notice-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .top-tags {
      display: flex;
      gap: 16px;
    }

    .top-tags span {
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--bg-dark);
      letter-spacing: -0.02em;
    }

    .brand-logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 18px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      transition: var(--transition);
    }

    .nav-menu a:hover {
      color: var(--brand-blue);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    /* Hero Section */
    .hero-section {
      padding: 64px 0 96px;
      background: linear-gradient(180deg, #f0f9ff 0%, #ffffff 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-content-wrap {
      max-width: 980px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--bg-dark);
      margin-bottom: 24px;
      letter-spacing: -0.03em;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, var(--brand-blue), #0284c7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.78;
      max-width: 860px;
      margin: 0 auto 36px;
    }

    .hero-check-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin-bottom: 40px;
      background: #ffffff;
      padding: 16px 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .hero-check-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .hero-check-item svg {
      width: 18px;
      height: 18px;
      color: var(--accent-emerald);
      flex-shrink: 0;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }

    .hero-visual-card {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(226, 232, 240, 0.8);
      position: relative;
    }

    .hero-visual-card img {
      width: 100%;
      height: 480px;
      object-fit: cover;
    }

    .hero-overlay-kpi {
      position: absolute;
      bottom: 24px;
      left: 24px;
      right: 24px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(8px);
      padding: 20px 32px;
      border-radius: var(--radius-md);
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      color: #ffffff;
      text-align: left;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .kpi-unit-title {
      font-size: 13px;
      color: var(--text-light);
      margin-bottom: 4px;
    }

    .kpi-unit-val {
      font-size: 24px;
      font-weight: 800;
      color: #38bdf8;
      font-family: monospace;
    }

    /* Section 2: Security & Compliance Manifesto */
    .manifesto-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 48px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .manifesto-text h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 18px;
      color: var(--text-main);
    }

    .manifesto-text p {
      color: var(--text-muted);
      margin-bottom: 18px;
      font-size: 15px;
    }

    .manifesto-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .manifesto-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: var(--text-main);
      font-weight: 500;
    }

    .manifesto-list li svg {
      width: 16px;
      height: 16px;
      color: var(--brand-blue);
    }

    /* Section 3: Technical Checkitems */
    .check-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .check-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: var(--transition);
    }

    .check-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }

    .check-card-head {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }

    .check-card-icon {
      width: 44px;
      height: 44px;
      background: #e0f2fe;
      color: var(--brand-blue);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      flex-shrink: 0;
    }

    .check-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
    }

    .check-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 4: Compliance Badges */
    .badge-ribbon {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .badge-card {
      background: var(--bg-dark-surface);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition);
    }

    .badge-card:hover {
      border-color: var(--brand-cyan);
    }

    .badge-card-icon {
      width: 52px;
      height: 52px;
      margin: 0 auto 16px;
      background: rgba(6, 182, 212, 0.12);
      color: var(--brand-cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .badge-card h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .badge-card p {
      font-size: 13px;
      color: var(--text-light);
      line-height: 1.6;
    }

    /* Section 5: Boundary & Algorithm Architecture */
    .boundary-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
    }

    .boundary-col {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px;
    }

    .boundary-col.scope-in {
      border-top: 4px solid var(--accent-emerald);
    }

    .boundary-col.scope-out {
      border-top: 4px solid var(--accent-amber);
    }

    .boundary-col h3 {
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .boundary-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .boundary-item svg {
      width: 18px;
      height: 18px;
      margin-top: 3px;
      flex-shrink: 0;
    }

    .scope-in svg { color: var(--accent-emerald); }
    .scope-out svg { color: var(--accent-amber); }

    /* Section 6: Scenarios */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .scenario-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .scenario-img-wrap {
      height: 200px;
      overflow: hidden;
    }

    .scenario-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .scenario-card:hover .scenario-img-wrap img {
      transform: scale(1.05);
    }

    .scenario-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .scenario-body h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .scenario-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .scenario-tags {
      margin-top: auto;
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .scenario-tags span {
      font-size: 12px;
      background: #f1f5f9;
      color: var(--text-muted);
      padding: 3px 10px;
      border-radius: 4px;
    }

    /* Section 7: Multi-Terminal Ecosystem */
    .multi-term-box {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .term-item {
      background: #ffffff;
      padding: 30px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      transition: var(--transition);
    }

    .term-item:hover {
      border-color: var(--brand-blue);
      box-shadow: var(--shadow-md);
    }

    .term-icon {
      font-size: 32px;
      margin-bottom: 16px;
      color: var(--brand-blue);
    }

    .term-item h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .term-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Section 8: Comparison Matrix */
    .matrix-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .matrix-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .matrix-table th, .matrix-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .matrix-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .matrix-table td:nth-child(2) {
      background: rgba(2, 132, 199, 0.03);
      font-weight: 600;
      color: var(--brand-blue);
    }

    .matrix-table tr:last-child td {
      border-bottom: none;
    }

    /* Section 9: Industry Insights & News */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .news-card:hover {
      border-color: var(--brand-blue);
      box-shadow: var(--shadow-md);
    }

    .news-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 14px;
    }

    .news-tag {
      color: var(--brand-blue);
      font-weight: 600;
      background: #e0f2fe;
      padding: 2px 8px;
      border-radius: 4px;
    }

    .news-card h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.5;
    }

    .news-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--brand-blue);
      display: flex;
      align-items: center;
      gap: 4px;
    }

    /* Section 10: Social Proof & Industry Endorsements */
    .endorse-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .endorse-card {
      background: var(--bg-dark-surface);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .endorse-quote {
      font-size: 14px;
      color: #cbd5e1;
      line-height: 1.75;
      margin-bottom: 24px;
    }

    .endorse-author {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid var(--border-dark);
      padding-top: 18px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      background: var(--brand-blue);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }

    .author-info h4 {
      font-size: 15px;
      font-weight: 700;
      color: #ffffff;
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-light);
    }

    /* Section 11: FAQ Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item:hover {
      border-color: #cbd5e1;
    }

    .faq-item summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-item summary::-webkit-details-marker {
      display: none;
    }

    .faq-item summary::after {
      content: '+';
      font-size: 20px;
      font-weight: 400;
      color: var(--brand-blue);
      transition: transform 0.2s ease;
    }

    .faq-item[open] summary::after {
      content: '−';
    }

    .faq-content {
      padding: 0 24px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.75;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    /* Section 12: Service SLA & Bottom Conversion */
    .sla-banner {
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      box-shadow: var(--shadow-lg);
    }

    .sla-info h3 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .sla-info p {
      font-size: 15px;
      color: var(--text-light);
      max-width: 620px;
      line-height: 1.7;
    }

    .sla-actions {
      display: flex;
      flex-direction: column;
      gap: 12px;
      flex-shrink: 0;
    }

    /* Sticky Bottom Bar */
    .sticky-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(15, 23, 42, 0.94);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      padding: 14px 0;
      z-index: 999;
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
    }

    .sticky-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .sticky-text {
      display: flex;
      align-items: center;
      gap: 16px;
      color: #ffffff;
      font-size: 14px;
      font-weight: 500;
    }

    .sticky-tag {
      background: rgba(6, 182, 212, 0.2);
      color: var(--brand-cyan);
      border: 1px solid rgba(6, 182, 212, 0.4);
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
    }

    .sticky-btns {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    /* Footer */
    .site-footer {
      background: #090d16;
      color: #64748b;
      padding: 72px 0 100px;
      border-top: 1px solid #1e293b;
      font-size: 13px;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 56px;
    }

    .footer-brand h4 {
      font-size: 18px;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .footer-col h5 {
      font-size: 14px;
      font-weight: 700;
      color: #cbd5e1;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .footer-contact p {
      margin-bottom: 8px;
      line-height: 1.6;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-h1 { font-size: 38px; }
      .manifesto-box { grid-template-columns: 1fr; gap: 32px; }
      .check-grid { grid-template-columns: repeat(2, 1fr); }
      .badge-ribbon { grid-template-columns: repeat(2, 1fr); }
      .scenario-grid { grid-template-columns: repeat(2, 1fr); }
      .multi-term-box { grid-template-columns: repeat(2, 1fr); }
      .news-grid { grid-template-columns: repeat(2, 1fr); }
      .endorse-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .section { padding: 60px 0; }
      .hero-h1 { font-size: 28px; }
      .hero-desc { font-size: 15px; }
      .nav-menu { display: none; }
      .top-notice-bar { display: none; }
      .hero-overlay-kpi { grid-template-columns: repeat(2, 1fr); position: relative; bottom: 0; left: 0; right: 0; border-radius: 0; }
      .boundary-wrap { grid-template-columns: 1fr; }
      .check-grid { grid-template-columns: 1fr; }
      .badge-ribbon { grid-template-columns: 1fr; }
      .scenario-grid { grid-template-columns: 1fr; }
      .multi-term-box { grid-template-columns: 1fr; }
      .news-grid { grid-template-columns: 1fr; }
      .endorse-grid { grid-template-columns: 1fr; }
      .sla-banner { flex-direction: column; text-align: center; padding: 36px 24px; }
      .sticky-text { display: none; }
      .sticky-inner { justify-content: center; }
      .footer-top { grid-template-columns: 1fr; }
    }