/* roulang page: index */
:root {
      --primary: #00D084;
      --primary-hover: #00B271;
      --primary-subtle: rgba(0, 208, 132, 0.12);
      --accent-navy: #0A2540;
      --accent-orange: #FF6B4A;
      --bg-light: #F4F6F9;
      --bg-dark: #11161F;
      --bg-card: #FFFFFF;
      --text-main: #1F2937;
      --text-muted: #64748B;
      --text-white: #F8FAFC;
      --border-color: rgba(0, 0, 0, 0.08);
      --border-dark: rgba(255, 255, 255, 0.1);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-soft: 0 4px 16px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 24px -6px rgba(0, 208, 132, 0.18);
      --font-stack: system-ui, -apple-system, "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-stack);
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.25s ease, background 0.25s ease;
    }

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: 1rem;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* Topbar */
    .top-bar {
      background-color: var(--accent-navy);
      color: #94A3B8;
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 40px;
    }
    .top-status {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
    }
    .top-contact {
      display: flex;
      gap: 1.5rem;
    }

    /* Header Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-wrapper {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-weight: 800;
      font-size: 1.25rem;
      letter-spacing: -0.02em;
      color: var(--accent-navy);
    }
    .brand-logo svg {
      width: 32px;
      height: 32px;
      fill: var(--primary);
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 1.75rem;
    }
    .nav-link {
      font-weight: 500;
      font-size: 0.9375rem;
      color: var(--text-main);
      padding: 0.5rem 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-hover);
    }
    .nav-cta-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--primary);
      color: #072619;
      font-weight: 600;
      font-size: 0.875rem;
      padding: 0.65rem 1.25rem;
      border-radius: var(--radius-sm);
      box-shadow: 0 4px 12px rgba(0, 208, 132, 0.2);
    }
    .nav-cta-btn:hover {
      background-color: var(--primary-hover);
      color: #fff;
    }

    /* Section Defaults */
    section {
      padding: 5rem 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 3.5rem auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--primary);
      background-color: var(--primary-subtle);
      padding: 0.25rem 0.75rem;
      border-radius: 99px;
      margin-bottom: 0.75rem;
      letter-spacing: 0.05em;
      text-transform: uppercase;
    }
    .section-title {
      font-size: 2.25rem;
      line-height: 1.3;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--accent-navy);
      margin-bottom: 1rem;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Hero */
    .hero-section {
      position: relative;
      background-color: var(--bg-dark);
      background-image: linear-gradient(180deg, rgba(17, 22, 31, 0.85) 0%, rgba(10, 37, 64, 0.95) 100%), url('/assets/images/5a8da6de24a25660.png');
      background-size: cover;
      background-position: center;
      color: var(--text-white);
      padding: 6.5rem 0;
      border-bottom: 1px solid var(--border-dark);
    }
    .hero-content {
      max-width: 880px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.03em;
      margin-bottom: 1.5rem;
      color: #FFFFFF;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 1.15rem;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 2.25rem;
    }
    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 1.25rem;
      margin-bottom: 2.5rem;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #062b1a;
      font-weight: 700;
      font-size: 1.05rem;
      padding: 0.9rem 2.25rem;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      border: 1px solid var(--primary);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #fff;
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      color: #FFFFFF;
      font-weight: 600;
      font-size: 1.05rem;
      padding: 0.9rem 2rem;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.25);
    }
    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }
    .hero-capsules {
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      flex-wrap: wrap;
    }
    .capsule-item {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.12);
      backdrop-filter: blur(8px);
      padding: 0.5rem 1.2rem;
      border-radius: 99px;
      font-size: 0.875rem;
      color: #E2E8F0;
    }

    /* Section 2: Countdown & Live Dispatch (Blueprint Event Flow) */
    .countdown-bar {
      background: #0D131D;
      border-bottom: 1px solid rgba(0, 208, 132, 0.2);
      padding: 2rem 0;
      color: #FFFFFF;
    }
    .countdown-flex {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 1.5rem;
    }
    .countdown-info h3 {
      font-size: 1.25rem;
      margin-bottom: 0.25rem;
      color: var(--primary);
    }
    .countdown-info p {
      font-size: 0.9rem;
      color: #94A3B8;
    }
    .timer-units {
      display: flex;
      gap: 1rem;
    }
    .timer-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-dark);
      padding: 0.6rem 1rem;
      border-radius: var(--radius-sm);
      text-align: center;
      min-width: 72px;
    }
    .timer-val {
      display: block;
      font-size: 1.75rem;
      font-weight: 800;
      font-family: monospace;
      color: #FFFFFF;
    }
    .timer-label {
      font-size: 0.75rem;
      color: #64748B;
    }

    /* Section 3: Overview & Hardware Integration */
    .overview-section {
      background-color: #FFFFFF;
    }
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: center;
    }
    .overview-card-panel {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 2.25rem;
      position: relative;
    }
    .param-list {
      list-style: none;
      margin-top: 1.5rem;
    }
    .param-list li {
      display: flex;
      justify-content: space-between;
      padding: 0.75rem 0;
      border-bottom: 1px dashed rgba(0, 0, 0, 0.1);
      font-size: 0.95rem;
    }
    .param-list li strong {
      color: var(--accent-navy);
    }

    /* Section 4: Advantages (6 Grid) */
    .advantages-section {
      background: var(--bg-light);
    }
    .cards-grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 2rem;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-soft);
      position: relative;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 208, 132, 0.4);
    }
    .adv-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-subtle);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.25rem;
      color: var(--primary);
      font-weight: 800;
    }
    .adv-card h4 {
      font-size: 1.25rem;
      margin-bottom: 0.75rem;
      color: var(--accent-navy);
    }
    .adv-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      margin-bottom: 1.25rem;
    }
    .adv-metric {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--primary);
      background: rgba(0, 208, 132, 0.08);
      padding: 0.25rem 0.5rem;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    /* Section 5: Matrix Services */
    .products-section {
      background-color: #FFFFFF;
    }
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .product-box {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: var(--bg-card);
      box-shadow: var(--shadow-soft);
      display: flex;
      flex-direction: column;
    }
    .product-img-wrap {
      height: 200px;
      overflow: hidden;
      background: #E2E8F0;
    }
    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-box:hover .product-img-wrap img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 1.75rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-body h4 {
      font-size: 1.25rem;
      color: var(--accent-navy);
      margin-bottom: 0.75rem;
    }
    .product-body p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      flex-grow: 1;
    }
    .product-link {
      font-weight: 600;
      color: var(--accent-navy);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.9375rem;
    }
    .product-link:hover {
      color: var(--primary);
    }

    /* Section 6: Dark Cockpit (#visual-cockpit) */
    .cockpit-section {
      background-color: var(--bg-dark);
      color: var(--text-white);
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }
    .cockpit-section .section-title {
      color: #FFFFFF;
    }
    .cockpit-dashboard {
      background: #161D29;
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .cockpit-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 2rem;
    }
    .mock-chart-large {
      height: 280px;
      background: #0E1520;
      border: 1px solid rgba(255, 255, 255, 0.05);
      border-radius: var(--radius-md);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 1.5rem;
      position: relative;
    }
    .chart-curve {
      width: 100%;
      height: 120px;
      display: flex;
      align-items: flex-end;
      gap: 8px;
    }
    .chart-bar {
      flex: 1;
      background: linear-gradient(180deg, var(--primary) 0%, rgba(0, 208, 132, 0.1) 100%);
      border-radius: 4px 4px 0 0;
    }
    .mock-radar {
      height: 280px;
      background: #0E1520;
      border: 1px solid rgba(255, 255, 255, 0.05);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
    }
    .radar-circle {
      width: 130px;
      height: 130px;
      border: 2px dashed rgba(0, 208, 132, 0.5);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .radar-inner {
      width: 70px;
      height: 70px;
      background: rgba(0, 208, 132, 0.2);
      border-radius: 50%;
      box-shadow: 0 0 15px var(--primary);
    }

    /* Section 7: Case Studies */
    .cases-section {
      background-color: var(--bg-light);
    }
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
    }
    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 2.5rem;
      box-shadow: var(--shadow-soft);
    }
    .case-tag {
      font-size: 0.8125rem;
      color: var(--accent-orange);
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    .case-card h4 {
      font-size: 1.35rem;
      margin-bottom: 1rem;
      color: var(--accent-navy);
    }
    .case-card p {
      color: var(--text-muted);
      margin-bottom: 1.5rem;
    }
    .stat-comparison {
      display: flex;
      gap: 1.5rem;
      border-top: 1px solid var(--border-color);
      padding-top: 1.25rem;
    }
    .stat-node strong {
      display: block;
      font-size: 1.5rem;
      color: var(--primary);
      font-weight: 800;
    }
    .stat-node span {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* Section 8: Metrics Strip */
    .metrics-strip {
      background-color: var(--accent-navy);
      color: #FFFFFF;
      padding: 3.5rem 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .metric-value {
      font-size: 2.5rem;
      font-weight: 800;
      font-family: monospace;
      color: var(--primary);
      margin-bottom: 0.5rem;
    }
    .metric-name {
      font-size: 0.95rem;
      color: #CBD5E1;
    }

    /* Section 9: Testimonials */
    .testimonials-section {
      background-color: #FFFFFF;
    }
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .testi-card {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 2rem;
      position: relative;
    }
    .testi-quote {
      font-size: 3rem;
      color: rgba(0, 208, 132, 0.2);
      line-height: 1;
      position: absolute;
      top: 1rem;
      right: 1.25rem;
      font-family: serif;
    }
    .testi-card p {
      font-size: 0.95rem;
      color: var(--text-main);
      margin-bottom: 1.5rem;
      position: relative;
      z-index: 1;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #CBD5E1;
      overflow: hidden;
    }
    .reviewer-info h5 {
      font-size: 0.9375rem;
      color: var(--accent-navy);
    }
    .reviewer-info small {
      color: var(--text-muted);
      font-size: 0.8125rem;
    }

    /* Section 10: News / Algorithms */
    .news-section {
      background-color: var(--bg-light);
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
    }
    .news-body {
      padding: 1.75rem;
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 0.75rem;
    }
    .news-card h4 {
      font-size: 1.15rem;
      margin-bottom: 0.75rem;
      color: var(--accent-navy);
      line-height: 1.4;
    }
    .news-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 11: FAQ */
    .faq-section {
      background-color: #FFFFFF;
    }
    .faq-container {
      max-width: 820px;
      margin: 0 auto;
    }
    details.faq-item {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 1rem;
      padding: 1.25rem 1.5rem;
      transition: all 0.2s ease;
    }
    details.faq-item[open] {
      background: #FFFFFF;
      border-color: var(--primary);
      box-shadow: var(--shadow-soft);
    }
    summary.faq-question {
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--accent-navy);
    }
    summary.faq-question::-webkit-details-marker {
      display: none;
    }
    summary.faq-question::after {
      content: '+';
      font-size: 1.5rem;
      font-weight: 300;
      color: var(--text-muted);
      transition: transform 0.2s ease;
    }
    details[open] summary.faq-question::after {
      content: '−';
      color: var(--primary);
    }
    .faq-answer {
      margin-top: 1rem;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 12: Compliance Bar & Final CTA Form */
    .compliance-section {
      background: #0E1724;
      color: #FFFFFF;
      padding: 3.5rem 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .compliance-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .compliance-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-sm);
      padding: 1.5rem;
    }
    .compliance-card h5 {
      font-size: 1rem;
      color: var(--primary);
      margin-bottom: 0.5rem;
    }
    .compliance-card p {
      font-size: 0.875rem;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* Final CTA Form */
    .cta-section {
      background: linear-gradient(135deg, #0A2540 0%, #11161F 100%);
      color: #FFFFFF;
      position: relative;
    }
    .cta-box {
      max-width: 760px;
      margin: 0 auto;
      text-align: center;
    }
    .cta-box h2 {
      font-size: 2.25rem;
      font-weight: 800;
      margin-bottom: 1rem;
      color: #FFFFFF;
    }
    .cta-box p {
      color: #CBD5E1;
      font-size: 1.05rem;
      margin-bottom: 2.5rem;
    }
    .cta-form {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.25rem;
      text-align: left;
    }
    .form-group-full {
      grid-column: span 2;
    }
    .form-label {
      display: block;
      font-size: 0.875rem;
      color: #CBD5E1;
      margin-bottom: 0.35rem;
    }
    .form-input {
      width: 100%;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: var(--radius-sm);
      padding: 0.75rem 1rem;
      color: #FFFFFF;
      outline: none;
    }
    .form-input:focus {
      border-color: var(--primary);
      background: rgba(255, 255, 255, 0.12);
    }
    .cta-submit-btn {
      width: 100%;
      background-color: var(--primary);
      color: #062B1A;
      font-weight: 700;
      border: none;
      padding: 1rem;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1.05rem;
      transition: all 0.25s ease;
    }
    .cta-submit-btn:hover {
      background-color: var(--primary-hover);
      color: #FFFFFF;
    }

    /* Footer */
    .site-footer {
      background: #0B1017;
      color: #64748B;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 1.2rem;
      margin-bottom: 1rem;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 1rem;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 0.95rem;
      margin-bottom: 1.25rem;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 0.65rem;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .cards-grid-6, .products-grid, .testi-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cockpit-grid {
        grid-template-columns: 1fr;
      }
      .compliance-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .top-contact {
        display: none;
      }
      .main-nav {
        display: none;
      }
      .hero-title {
        font-size: 2.15rem;
      }
      .overview-grid, .cases-grid, .cta-form, .cards-grid-6, .products-grid, .testi-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .countdown-flex {
        flex-direction: column;
        align-items: flex-start;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }