/* roulang page: index */
:root {
      --primary: #0F172A;
      --primary-light: #1E293B;
      --accent: #0EA5E9;
      --accent-hover: #0284C7;
      --success: #10B981;
      --dark-surface: #090D16;
      --dark-card: #111827;
      --bg-base: #FFFFFF;
      --bg-alt: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.08);
      --radius-sm: 6px;
      --radius-md: 8px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 10px 15px -5px rgba(0,0,0,0.03);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --transition-default: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      --container-max: 1200px;
    }

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

    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: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .tnum {
      font-feature-settings: "tnum";
      font-variant-numeric: tabular-nums;
    }

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

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

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

    /* Top Utility Bar */
    .top-bar {
      background-color: var(--primary);
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-left {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--success);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 8px var(--success);
    }
    .top-bar-right {
      display: flex;
      gap: 20px;
    }
    .top-bar-right a:hover {
      color: #FFFFFF;
    }

    /* Sticky Main Navigation */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition-default);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-badge {
      font-size: 11px;
      padding: 2px 6px;
      background: #E0F2FE;
      color: #0369A1;
      border-radius: 4px;
      font-weight: 600;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
    }
    .nav-links a.active::after {
      content: "";
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      border-radius: 2px;
    }
    .nav-action .btn-primary {
      padding: 9px 20px;
      font-size: 14px;
      background-color: var(--primary);
      color: #FFFFFF;
      border-radius: var(--radius-sm);
      font-weight: 500;
      display: inline-block;
    }
    .nav-action .btn-primary:hover {
      background-color: var(--accent);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background-color: var(--primary);
      margin: 4px 0;
      transition: var(--transition-default);
    }

    /* Common Section Styles */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-dark {
      background-color: var(--dark-surface);
      color: #FFFFFF;
    }
    .section-header {
      margin-bottom: 50px;
      max-width: 760px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 12px;
      background: #F0F9FF;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid #BAE6FD;
    }
    .section-dark .section-tag {
      background: rgba(14, 165, 233, 0.15);
      border-color: rgba(14, 165, 233, 0.3);
      color: #38BDF8;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* Section 1: Hero */
    .hero-section {
      background-color: #0B1120;
      background-image: linear-gradient(rgba(11, 17, 32, 0.88), rgba(11, 17, 32, 0.94)), url('/assets/images/6ad3ae694e4a9a61.jpg');
      background-size: cover;
      background-position: center;
      padding: 100px 0 110px;
      color: #FFFFFF;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .hero-h1 span {
      color: var(--accent);
    }
    .hero-p {
      font-size: 16px;
      line-height: 1.7;
      color: #94A3B8;
      margin-bottom: 32px;
      max-width: 620px;
    }
    .hero-btns {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline-white {
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: #FFFFFF;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 500;
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }
    .hero-spec-strip {
      display: flex;
      gap: 32px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }
    .spec-item .spec-num {
      font-size: 20px;
      font-weight: 700;
      color: #38BDF8;
    }
    .spec-item .spec-label {
      font-size: 12px;
      color: #64748B;
    }
    .hero-mockup-wrapper {
      position: relative;
    }
    .hero-vertical-card {
      background: #0F172A;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 12px;
      padding: 20px;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
    .card-terminal-bar {
      display: flex;
      gap: 6px;
      margin-bottom: 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .terminal-circle {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #334155;
    }
    .terminal-circle.red { background: #EF4444; }
    .terminal-circle.yellow { background: #F59E0B; }
    .terminal-circle.green { background: #10B981; }
    .hero-stream-preview {
      border-radius: 8px;
      overflow: hidden;
      margin-bottom: 16px;
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .live-stream-data {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 12px;
      background: #020617;
      padding: 12px;
      border-radius: 6px;
      color: #A5F3FC;
      line-height: 1.5;
    }

    /* Section 2: Security Claims */
    .sec-claim-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .sec-claim-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-default);
    }
    .sec-claim-card:hover {
      transform: translateY(-2px);
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
    }
    .claim-icon {
      width: 44px;
      height: 44px;
      background: #EFF6FF;
      color: #0284C7;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 20px;
      font-size: 18px;
    }
    .claim-card-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .claim-card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 3: Engineering Checkpoints */
    .checklist-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .check-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .check-status-tag {
      font-size: 11px;
      font-weight: 600;
      color: var(--success);
      background: #ECFDF5;
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .check-title {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .check-p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Section 4: Compliance Badges */
    .badges-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .badge-box {
      border: 1px dashed var(--border-color);
      padding: 24px;
      border-radius: var(--radius-md);
      text-align: center;
      background: #FFFFFF;
    }
    .badge-mark {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .badge-name {
      font-size: 15px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .badge-desc {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Section 5: Data Engine Architecture (Dark) */
    .arch-flow-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .arch-step-card {
      background: #111827;
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 30px;
      position: relative;
    }
    .step-index {
      font-size: 12px;
      font-weight: 700;
      color: #38BDF8;
      letter-spacing: 1px;
      margin-bottom: 12px;
    }
    .arch-title {
      font-size: 18px;
      font-weight: 600;
      color: #F8FAFC;
      margin-bottom: 12px;
    }
    .arch-text {
      font-size: 13px;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* Section 6: Boundary & Scope */
    .boundary-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .boundary-box {
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      background: #FFFFFF;
    }
    .boundary-box.allow {
      border-top: 4px solid var(--success);
    }
    .boundary-box.prohibit {
      border-top: 4px solid #EF4444;
    }
    .boundary-tag {
      font-size: 12px;
      font-weight: 700;
      margin-bottom: 12px;
      display: inline-block;
    }
    .boundary-box.allow .boundary-tag { color: var(--success); }
    .boundary-box.prohibit .boundary-tag { color: #EF4444; }
    .boundary-list {
      list-style: none;
      margin-top: 16px;
    }
    .boundary-list li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 10px;
      position: relative;
      padding-left: 20px;
    }
    .boundary-list li::before {
      content: "•";
      position: absolute;
      left: 4px;
      font-weight: bold;
    }

    /* Section 7: Metrics / KPI */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 30px 24px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .metric-value {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .metric-unit {
      font-size: 20px;
      color: var(--accent);
    }
    .metric-name {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-detail {
      font-size: 12px;
      color: var(--text-light);
    }

    /* Section 8: Product Line Cards */
    .product-cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-default);
    }
    .product-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .prod-cover {
      height: 180px;
      width: 100%;
      object-fit: cover;
      background: #E2E8F0;
    }
    .prod-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .prod-badge {
      font-size: 11px;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 8px;
      text-transform: uppercase;
    }
    .prod-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--primary);
    }
    .prod-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .prod-specs-list {
      list-style: none;
      margin-bottom: 24px;
      font-size: 13px;
      color: var(--text-main);
    }
    .prod-specs-list li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .prod-specs-list li::before {
      content: "✓";
      color: var(--success);
      font-weight: bold;
    }
    .prod-action-btn {
      margin-top: auto;
      text-align: center;
      padding: 10px 0;
      background: #F1F5F9;
      color: var(--primary);
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 600;
    }
    .prod-action-btn:hover {
      background: var(--accent);
      color: #FFFFFF;
    }

    /* Section 9: Case Studies */
    .case-strip-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-scenario {
      font-size: 12px;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .case-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .case-p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .case-benchmarks {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }
    .bench-col span {
      display: block;
      font-size: 12px;
      color: var(--text-light);
    }
    .bench-col strong {
      font-size: 16px;
      color: var(--primary);
    }

    /* Section 10: Tech Articles / News List */
    .news-stack {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .news-row {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition-default);
    }
    .news-row:hover {
      border-color: var(--accent);
      transform: translateX(4px);
    }
    .news-meta-date {
      font-size: 12px;
      color: #64748B;
      font-family: monospace;
      width: 110px;
    }
    .news-content-col {
      flex-grow: 1;
      padding: 0 24px;
    }
    .news-link-title {
      font-size: 16px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .news-summary {
      font-size: 13px;
      color: var(--text-muted);
    }
    .news-action-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      white-space: nowrap;
    }

    /* Section 11: Endorsement / Social Proof */
    .quote-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .quote-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .quote-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 12px;
    }
    .quote-body {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: italic;
    }
    .quote-author strong {
      display: block;
      font-size: 14px;
      color: var(--primary);
    }
    .quote-author span {
      font-size: 12px;
      color: var(--text-light);
    }

    /* Section 12: Contact Form */
    .contact-wrapper {
      background: #0F172A;
      padding: 80px 0;
      color: #FFFFFF;
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .contact-info h2 {
      font-size: 32px;
      margin-bottom: 20px;
    }
    .contact-info p {
      color: #94A3B8;
      margin-bottom: 24px;
    }
    .contact-form {
      background: #1E293B;
      padding: 40px;
      border-radius: 8px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      margin-bottom: 8px;
      color: #CBD5E1;
    }
    .form-group input, .form-group textarea, .form-group select {
      width: 100%;
      padding: 12px;
      background: #0F172A;
      border: 1px solid #334155;
      color: #FFFFFF;
      border-radius: 4px;
    }
    .form-btn {
      width: 100%;
      padding: 14px;
      background: var(--accent);
      color: #FFFFFF;
      border: none;
      border-radius: 4px;
      font-weight: 600;
      cursor: pointer;
    }

    /* Footer */
    .footer {
      background: #020617;
      color: #64748B;
      padding: 60px 0 20px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 20px;
      text-align: center;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero-grid, .sec-claim-grid, .checklist-grid, .badges-row, .arch-flow-grid, .boundary-split, .metrics-bar, .product-cards-grid, .case-strip-grid, .quote-grid, .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }