/* roulang page: index */
:root {
      --primary: #00E599;
      --primary-hover: #00c784;
      --secondary: #FF5C00;
      --dark-deep: #0B0E14;
      --dark-card: #141923;
      --dark-border: rgba(255, 255, 255, 0.08);
      --bg-light: #F6F8FA;
      --bg-white: #FFFFFF;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-sub: #9CA3AF;
      --font-mono: "Roboto Mono", "DIN Alternate", Consolas, monospace;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-card: 0 10px 30px rgba(0,0,0,0.06);
      --shadow-glow: 0 0 25px rgba(0, 229, 153, 0.25);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    ul, ol {
      list-style: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .top-bar {
      background: #080A0E;
      color: var(--text-sub);
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .sys-status {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--dark-border);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      color: #FFF;
      font-weight: 700;
      font-size: 20px;
      letter-spacing: -0.5px;
    }
    .brand-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), #009966);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0B0E14;
      font-weight: 900;
      font-size: 18px;
    }
    .main-nav ul {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .main-nav a {
      color: #D1D5DB;
      font-size: 15px;
      font-weight: 500;
    }
    .main-nav a:hover, .main-nav a.active {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: #0B0E14;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 30px;
      transition: var(--transition);
    }
    .nav-cta:hover {
      background: #FFFFFF;
      box-shadow: var(--shadow-glow);
    }
    .hero-section {
      background: radial-gradient(circle at 80% 20%, rgba(0, 229, 153, 0.12), transparent 50%), #0B0E14;
      color: #FFF;
      padding: 70px 0 90px;
      position: relative;
      border-bottom: 1px solid var(--dark-border);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 50px;
      align-items: center;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0, 229, 153, 0.12);
      border: 1px solid rgba(0, 229, 153, 0.3);
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 46px;
      line-height: 1.22;
      font-weight: 800;
      letter-spacing: -1px;
      margin-bottom: 24px;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 17px;
      line-height: 1.75;
      color: #9CA3AF;
      margin-bottom: 36px;
      max-width: 620px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .btn-primary {
      background: var(--primary);
      color: #0B0E14;
      padding: 14px 30px;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: 1px solid var(--primary);
    }
    .btn-primary:hover {
      background: #FFF;
      color: #0B0E14;
      border-color: #FFF;
      box-shadow: var(--shadow-glow);
    }
    .btn-secondary {
      background: rgba(255, 255, 255, 0.05);
      color: #FFF;
      padding: 14px 28px;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(255, 255, 255, 0.15);
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: rgba(255, 255, 255, 0.3);
    }
    .code-console {
      background: #141923;
      border: 1px solid var(--dark-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .console-header {
      background: #0D1118;
      padding: 12px 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .window-dots {
      display: flex;
      gap: 6px;
    }
    .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .dot.red { background: #FF5F56; }
    .dot.yellow { background: #FFBD2E; }
    .dot.green { background: #27C93F; }
    .console-title {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--text-sub);
    }
    .console-body {
      padding: 20px;
      font-family: var(--font-mono);
      font-size: 13px;
      line-height: 1.7;
      color: #E5E7EB;
    }
    .console-body .token-kw { color: #FF7B72; }
    .console-body .token-fn { color: #79C0FF; }
    .console-body .token-str { color: #A5D6FF; }
    .console-body .token-num { color: #FFA657; }
    .console-body .token-comment { color: #6E7681; }
    .section-block {
      padding: 85px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .bg-dark {
      background-color: var(--dark-deep);
      color: #FFF;
    }
    .bg-dark .section-title {
      color: #FFF;
    }
    .bg-dark .section-desc {
      color: #9CA3AF;
    }
    .bg-white {
      background-color: var(--bg-white);
    }
    .split-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .spec-table {
      margin-top: 24px;
      border: 1px solid #E5E7EB;
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #FFF;
    }
    .spec-row {
      display: flex;
      padding: 12px 18px;
      border-bottom: 1px solid #F3F4F6;
      font-size: 14px;
    }
    .spec-row:last-child {
      border-bottom: none;
    }
    .spec-label {
      width: 140px;
      color: var(--text-muted);
      font-weight: 500;
    }
    .spec-val {
      color: var(--text-main);
      font-family: var(--font-mono);
      font-weight: 600;
    }
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #FFFFFF;
      border: 1px solid rgba(0, 0, 0, 0.06);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card);
      border-color: rgba(0, 229, 153, 0.4);
    }
    .feature-icon-box {
      width: 52px;
      height: 52px;
      background: rgba(0, 229, 153, 0.1);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: #009966;
      margin-bottom: 20px;
      font-weight: 800;
    }
    .feature-card h3 {
      font-size: 19px;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .product-card {
      background: #FFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid #E5E7EB;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card);
    }
    .product-thumb {
      height: 220px;
      position: relative;
      background: #E5E7EB;
      overflow: hidden;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-tag {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(11, 14, 20, 0.85);
      color: var(--primary);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
      backdrop-filter: blur(4px);
    }
    .product-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-body h3 {
      font-size: 18px;
      margin-bottom: 10px;
    }
    .product-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .product-meta {
      border-top: 1px solid #F3F4F6;
      padding-top: 14px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--text-sub);
    }
    .product-meta span.val {
      color: var(--text-main);
      font-weight: 600;
      font-family: var(--font-mono);
    }
    .twin-visual {
      background: #141923;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--dark-border);
    }
    .twin-metrics-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-bottom: 28px;
    }
    .twin-metric-item {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.06);
      padding: 16px;
      border-radius: var(--radius-sm);
    }
    .twin-metric-item .label {
      font-size: 12px;
      color: #9CA3AF;
      margin-bottom: 6px;
    }
    .twin-metric-item .val {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-mono);
    }
    .twin-flow-wrap {
      background: rgba(0,0,0,0.3);
      border-radius: var(--radius-md);
      padding: 20px;
      border: 1px dashed rgba(255, 255, 255, 0.1);
    }
    .workflow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .workflow-card {
      background: #FFF;
      border: 1px solid #E5E7EB;
      padding: 24px;
      border-radius: var(--radius-md);
      position: relative;
    }
    .wf-step-num {
      width: 32px;
      height: 32px;
      background: #0B0E14;
      color: var(--primary);
      font-family: var(--font-mono);
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      font-size: 14px;
    }
    .workflow-card h4 {
      font-size: 17px;
      margin-bottom: 8px;
    }
    .workflow-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .metrics-bar {
      background: linear-gradient(180deg, #0B0E14 0%, #111722 100%);
      color: #FFF;
      padding: 50px 0;
      border-top: 1px solid var(--dark-border);
      border-bottom: 1px solid var(--dark-border);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .metric-box .number {
      font-size: 42px;
      font-weight: 800;
      font-family: var(--font-mono);
      color: var(--primary);
      line-height: 1;
      margin-bottom: 10px;
    }
    .metric-box .unit {
      font-size: 20px;
      font-weight: 500;
      color: #FFF;
      margin-left: 2px;
    }
    .metric-box .name {
      font-size: 14px;
      color: #9CA3AF;
      letter-spacing: 0.5px;
    }
    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .story-card {
      background: #FFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid #E5E7EB;
      box-shadow: var(--shadow-sm);
    }
    .story-img {
      height: 240px;
      background: #D1D5DB;
    }
    .story-content {
      padding: 28px;
    }
    .story-tag {
      color: #FF5C00;
      font-weight: 600;
      font-size: 13px;
      margin-bottom: 8px;
      display: inline-block;
    }
    .story-content h3 {
      font-size: 20px;
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .story-content p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .story-stat-badge {
      display: inline-flex;
      background: #F3F4F6;
      padding: 6px 12px;
      border-radius: 4px;
      font-size: 13px;
      color: var(--text-main);
      font-weight: 500;
    }
    .testimonial-card {
      background: #FFF;
      border: 1px solid #E5E7EB;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quote-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid #F3F4F6;
      padding-top: 16px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #0B0E14;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }
    .user-name {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }
    .user-role {
      font-size: 12px;
      color: var(--text-sub);
    }
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFF;
      border: 1px solid #E5E7EB;
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      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(--text-sub);
      transition: transform 0.2s ease;
    }
    .faq-item[open] summary:after {
      transform: rotate(45deg);
      color: var(--secondary);
    }
    .faq-answer {
      padding: 0 24px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .cta-card-box {
      background: linear-gradient(135deg, #0D1118 0%, #161F2E 100%);
      border: 1px solid var(--dark-border);
      border-radius: var(--radius-lg);
      padding: 50px 60px;
      color: #FFF;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
      box-shadow: 0 20px 50px rgba(0,0,0,0.3);
    }
    .cta-card-box h3 {
      font-size: 30px;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .cta-card-box p {
      font-size: 15px;
      color: #9CA3AF;
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .cta-form {
      background: rgba(255, 255, 255, 0.04);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      color: #E5E7EB;
      margin-bottom: 6px;
    }
    .form-input {
      width: 100%;
      background: rgba(0, 0, 0, 0.4);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 12px 14px;
      color: #FFF;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(0, 229, 153, 0.2);
    }
    .btn-submit {
      width: 100%;
      background: var(--primary);
      color: #0B0E14;
      font-weight: 700;
      padding: 14px;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-submit:hover {
      background: #FFFFFF;
      box-shadow: var(--shadow-glow);
    }
    .site-footer {
      background: #07090C;
      color: #9CA3AF;
      padding: 60px 0 30px;
      border-top: 1px solid var(--dark-border);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #FFF;
      font-size: 18px;
      margin-bottom: 14px;
    }
    .footer-brand p {
      line-height: 1.7;
      color: #6B7280;
      margin-bottom: 16px;
    }
    .footer-col h5 {
      color: #FFF;
      font-size: 15px;
      margin-bottom: 18px;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
      color: #6B7280;
    }
    @media (max-width: 1024px) {
      .hero-grid, .split-layout, .cta-card-box {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-grid, .metrics-grid, .twin-metrics-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .main-nav {
        display: none;
      }
      .hero-title {
        font-size: 32px;
      }
      .card-grid-3, .stories-grid, .workflow-grid, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .cta-card-box {
        padding: 30px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }