/* roulang page: index */
:root {
      --primary-navy: #0B1B3D;
      --navy-deep: #0A1128;
      --navy-light: #0F1E42;
      --teal-accent: #0D9488;
      --cyan-accent: #0284C7;
      --emerald-green: #10B981;
      --danger-red: #EF4444;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-dark: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-inverse: #F8FAFC;
      --border-color: #E2E8F0;
      --border-dark: #1E293B;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-soft: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-family);
      color: var(--text-body);
      background-color: var(--bg-light);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select, textarea {
      font-family: inherit;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }
    .top-infobar {
      background-color: var(--navy-deep);
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-infobar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-badges span {
      margin-right: 18px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .nav-wrapper {
      padding: 14px 0;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--primary-navy);
      letter-spacing: -0.5px;
    }
    .brand-logo svg {
      width: 32px;
      height: 32px;
      fill: var(--teal-accent);
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-dark);
      padding: 6px 4px;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--teal-accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--teal-accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--teal-accent);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(13, 148, 136, 0.3);
    }
    .btn-primary:hover {
      background-color: #0F766E;
      transform: translateY(-2px);
    }
    .btn-secondary {
      background-color: transparent;
      border-color: #CBD5E1;
      color: var(--text-dark);
    }
    .btn-secondary:hover {
      border-color: var(--teal-accent);
      color: var(--teal-accent);
      background: rgba(13, 148, 136, 0.04);
    }
    .btn-white {
      background-color: #FFFFFF;
      color: var(--primary-navy);
    }
    .btn-white:hover {
      background-color: #F1F5F9;
      transform: translateY(-2px);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-dark);
      cursor: pointer;
    }
    .sec-block {
      padding: 80px 0;
      position: relative;
    }
    .bg-white-sec {
      background-color: var(--bg-white);
    }
    .bg-light-sec {
      background-color: var(--bg-light);
    }
    .bg-dark-sec {
      background-color: var(--navy-deep);
      color: var(--text-inverse);
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 52px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--teal-accent);
      background: rgba(13, 148, 136, 0.1);
      padding: 4px 12px;
      border-radius: 9999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .bg-dark-sec .section-tag {
      background: rgba(13, 148, 136, 0.2);
      color: #2DD4BF;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .bg-dark-sec .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .bg-dark-sec .section-desc {
      color: #94A3B8;
    }
    .hero-banner-sec {
      position: relative;
      background-color: var(--navy-deep);
      background-image: linear-gradient(135deg, rgba(10, 17, 40, 0.94) 0%, rgba(15, 30, 66, 0.88) 100%), url('/assets/images/71be385c35d39d76.webp');
      background-size: cover;
      background-position: center;
      color: #FFFFFF;
      padding: 90px 0 70px 0;
      overflow: hidden;
    }
    .flash-notice-strip {
      background: rgba(2, 132, 199, 0.2);
      border: 1px solid rgba(56, 189, 248, 0.3);
      border-radius: 8px;
      padding: 10px 18px;
      margin-bottom: 30px;
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-size: 0.875rem;
    }
    .pulse-badge {
      background-color: #EF4444;
      color: #FFFFFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; }
      50% { opacity: 0.6; }
      100% { opacity: 1; }
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .hero-content p {
      font-size: 1.0625rem;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .hero-trust-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding-top: 24px;
    }
    .hero-trust-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.875rem;
      color: #94A3B8;
    }
    .hero-trust-item svg {
      width: 18px;
      height: 18px;
      fill: var(--teal-accent);
    }
    .hero-visual-card {
      background: rgba(15, 30, 66, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }
    .hero-visual-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding-bottom: 16px;
      margin-bottom: 20px;
    }
    .engine-status-badge {
      background: rgba(16, 185, 129, 0.2);
      color: #34D399;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 9999px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .engine-status-badge::before {
      content: '';
      width: 8px;
      height: 8px;
      background: #10B981;
      border-radius: 50%;
    }
    .hero-metric-rows {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-bottom: 20px;
    }
    .hero-metric-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-sm);
      padding: 14px;
    }
    .hero-metric-box span {
      font-size: 0.75rem;
      color: #94A3B8;
      display: block;
      margin-bottom: 4px;
    }
    .hero-metric-box strong {
      font-size: 1.35rem;
      color: #FFFFFF;
      font-variant-numeric: tabular-nums;
    }
    .hero-visual-card img {
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .arch-overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .spec-table {
      margin-top: 24px;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .spec-item {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 16px;
    }
    .spec-item h4 {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 6px;
    }
    .spec-item p {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--primary-navy);
      line-height: 1.4;
    }
    .image-frame {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--border-color);
    }
    .grid-3-col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card-advantage {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-soft);
      transition: all 0.3s ease;
    }
    .card-advantage:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(13, 148, 136, 0.4);
    }
    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-sm);
      background: rgba(13, 148, 136, 0.1);
      color: var(--teal-accent);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .card-icon svg {
      width: 28px;
      height: 28px;
      fill: currentColor;
    }
    .card-advantage h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    .card-advantage p {
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.7;
    }
    .product-row-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      display: grid;
      grid-template-columns: 1fr 1.2fr auto;
      gap: 32px;
      align-items: center;
      margin-bottom: 24px;
      box-shadow: var(--shadow-soft);
      position: relative;
      overflow: hidden;
    }
    .product-row-card.highlight {
      border: 2px solid var(--teal-accent);
    }
    .ribbon {
      position: absolute;
      top: 18px;
      right: -32px;
      background: var(--teal-accent);
      color: #FFFFFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 36px;
      transform: rotate(45deg);
      box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    }
    .product-header h3 {
      font-size: 1.375rem;
      color: var(--primary-navy);
      margin-bottom: 8px;
    }
    .product-header p {
      font-size: 0.9375rem;
      color: var(--text-muted);
    }
    .check-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }
    .check-list li {
      font-size: 0.875rem;
      color: var(--text-body);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .check-list li svg {
      width: 16px;
      height: 16px;
      fill: var(--teal-accent);
      flex-shrink: 0;
    }
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      transition: all 0.3s ease;
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-body {
      padding: 24px;
    }
    .scenario-body h3 {
      font-size: 1.15rem;
      margin-bottom: 10px;
      color: var(--text-dark);
    }
    .scenario-body p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }
    .scenario-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .scenario-tag-list span {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      font-size: 0.75rem;
      padding: 3px 8px;
      border-radius: 4px;
      color: var(--text-muted);
    }
    .security-matrix {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .sec-feature-box {
      margin-bottom: 24px;
      border-left: 3px solid var(--teal-accent);
      padding-left: 18px;
    }
    .sec-feature-box h4 {
      font-size: 1.125rem;
      color: #FFFFFF;
      margin-bottom: 6px;
    }
    .sec-feature-box p {
      font-size: 0.9375rem;
      color: #94A3B8;
      line-height: 1.7;
    }
    .metrics-strip {
      background: var(--primary-navy);
      color: #FFFFFF;
      padding: 50px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-col strong {
      display: block;
      font-size: 2.5rem;
      font-weight: 800;
      color: #38BDF8;
      font-variant-numeric: tabular-nums;
      margin-bottom: 8px;
    }
    .metric-col span {
      font-size: 0.9375rem;
      color: #CBD5E1;
    }
    .case-card-deep {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      box-shadow: var(--shadow-soft);
    }
    .case-stat-compare {
      margin-top: 24px;
      background: var(--bg-light);
      border-radius: var(--radius-md);
      padding: 20px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      text-align: center;
    }
    .compare-item span {
      font-size: 0.8125rem;
      color: var(--text-muted);
      display: block;
      margin-bottom: 6px;
    }
    .compare-item strong {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-navy);
    }
    .compare-item.highlight strong {
      color: var(--teal-accent);
    }
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-soft);
      position: relative;
    }
    .testimonial-quote {
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.8;
      margin-bottom: 24px;
      font-style: italic;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--navy-light);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }
    .author-info h4 {
      font-size: 0.9375rem;
      color: var(--text-dark);
    }
    .author-info span {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      display: flex;
      flex-direction: column;
    }
    .news-card-body {
      padding: 24px;
      flex-grow: 1;
    }
    .news-meta {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 10px;
      display: flex;
      justify-content: space-between;
    }
    .news-card h3 {
      font-size: 1.15rem;
      margin-bottom: 12px;
      color: var(--text-dark);
      line-height: 1.4;
    }
    .news-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--text-dark);
      user-select: none;
    }
    .faq-icon {
      width: 20px;
      height: 20px;
      transition: transform 0.3s ease;
      fill: var(--text-muted);
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      fill: var(--teal-accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background-color: #FAFAFC;
    }
    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.75;
      border-top: 1px solid rgba(0,0,0,0.03);
    }
    .faq-item.active .faq-answer {
      max-height: 400px;
    }
    .cta-form-container {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: 0 16px 36px rgba(0,0,0,0.06);
      max-width: 980px;
      margin: 0 auto;
    }
    .cta-form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group.full-width {
      grid-column: span 2;
    }
    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.9375rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: border-color 0.2s ease;
      background-color: #FBFDFE;
    }
    .form-control:focus {
      border-color: var(--teal-accent);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }
    .form-privacy-note {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-top: 14px;
      text-align: center;
    }
    .site-footer {
      background-color: var(--navy-deep);
      color: #94A3B8;
      font-size: 0.875rem;
      padding: 70px 0 30px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #2DD4BF;
    }
    .footer-contact-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }
    .footer-contact-list svg {
      width: 16px;
      height: 16px;
      fill: var(--teal-accent);
      flex-shrink: 0;
      margin-top: 4px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
    }
    .footer-bottom a:hover {
      color: #FFFFFF;
    }
    .floating-cta-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 27, 61, 0.95);
      backdrop-filter: blur(8px);
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding: 12px 0;
      z-index: 999;
      box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
    }
    .floating-cta-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .floating-text {
      color: #FFFFFF;
      font-size: 0.9375rem;
    }
    .floating-text span {
      color: #38BDF8;
      font-weight: 600;
      margin-left: 8px;
    }
    @media (max-width: 1024px) {
      .hero-grid, .arch-overview-grid, .case-card-deep, .security-matrix {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .grid-3-col {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .product-row-card {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .top-infobar {
        display: none;
      }
      .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .main-nav.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .grid-3-col, .scenario-grid, .cta-form-grid, .spec-table {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .cta-form-container {
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .floating-text {
        display: none;
      }
      .floating-cta-inner {
        justify-content: center;
      }
    }