/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-hover: #0b375d;
      --accent: #00A3C4;
      --accent-light: #e0f7fa;
      --bg-main: #FFFFFF;
      --bg-alt: #F4F7FB;
      --bg-dark: #0B132B;
      --text-dark: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 2px 8px rgba(15, 76, 129, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 76, 129, 0.06);
      --shadow-hover: 0 12px 28px -4px rgba(15, 76, 129, 0.12);
      --transition: all 0.25s ease-in-out;
      --container-max: 1280px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-body);
      background-color: var(--bg-main);
      line-height: 1.7;
      letter-spacing: 0.01em;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    ul, ol {
      list-style: none;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .top-bar {
      background-color: #0d2847;
      color: #94a3b8;
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 8px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-left, .top-bar-right {
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .top-badge {
      background-color: rgba(0, 163, 196, 0.2);
      color: var(--accent);
      padding: 2px 8px;
      border-radius: var(--radius-sm);
      font-weight: 500;
    }
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 1px 3px rgba(0,0,0,0.03);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 76px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
    }
    .logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      font-size: 1.1rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-dark);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after, .nav-link:hover::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }
    .nav-cta-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: var(--primary);
      color: #fff;
      padding: 10px 20px;
      border-radius: 30px;
      font-size: 0.875rem;
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(15, 76, 129, 0.25);
    }
    .nav-cta-btn:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-dark);
      cursor: pointer;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: var(--primary);
      color: #fff;
      padding: 14px 28px;
      border-radius: 30px;
      font-size: 0.95rem;
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid var(--primary);
      min-height: 48px;
    }
    .btn-main:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(15, 76, 129, 0.25);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: #fff;
      color: var(--primary);
      border: 1px solid var(--border-color);
      padding: 14px 28px;
      border-radius: 30px;
      font-size: 0.95rem;
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
      min-height: 48px;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background-color: #f8fafc;
    }
    .section-spacing {
      padding: 92px 0;
    }
    .section-spacing-sm {
      padding: 64px 0;
    }
    .bg-light {
      background-color: var(--bg-alt);
    }
    .bg-pure {
      background-color: var(--bg-main);
    }
    .section-header {
      margin-bottom: 52px;
      text-align: center;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--primary);
      background-color: rgba(15, 76, 129, 0.08);
      padding: 6px 14px;
      border-radius: 20px;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto;
      line-height: 1.75;
    }
    .hero-section {
      background: linear-gradient(rgba(255, 255, 255, 0.94), rgba(244, 247, 251, 0.97)), url('/assets/images/c26bd927aac59dd4.jpg') center/cover no-repeat;
      padding: 80px 0 96px;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-layout {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0, 163, 196, 0.12);
      color: #00839e;
      border: 1px solid rgba(0, 163, 196, 0.3);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.01em;
    }
    .hero-h1 span {
      color: var(--primary);
    }
    .hero-summary {
      font-size: 1.1rem;
      color: var(--text-body);
      line-height: 1.8;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
    }
    .hero-metrics {
      display: flex;
      gap: 28px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }
    .hero-metric-item h4 {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 2px;
    }
    .hero-metric-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .hero-card-featured {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 2px solid var(--primary);
      box-shadow: 0 16px 36px rgba(15, 76, 129, 0.1);
      padding: 32px;
      position: relative;
    }
    .featured-tag {
      position: absolute;
      top: -14px;
      right: 28px;
      background: var(--primary);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 12px;
      letter-spacing: 0.05em;
    }
    .card-title-lg {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .hero-list-points {
      margin: 20px 0;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .hero-list-points li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.92rem;
      color: var(--text-body);
    }
    .hero-list-points li i {
      color: var(--accent);
      margin-top: 4px;
    }
    .tech-intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .tech-info-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .spec-indicator-list {
      margin-top: 24px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .spec-indicator-box {
      background: var(--bg-alt);
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border-left: 3px solid var(--primary);
    }
    .spec-indicator-box h5 {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 4px;
    }
    .spec-indicator-box span {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .matrix-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 32px 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .matrix-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(15, 76, 129, 0.3);
    }
    .matrix-icon-wrapper {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      background: rgba(15, 76, 129, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      margin-bottom: 20px;
    }
    .matrix-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    .matrix-card p {
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .product-tier-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }
    .product-tier-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .product-tier-card.highlight {
      border: 2px solid var(--primary);
    }
    .tier-badge {
      display: inline-block;
      align-self: flex-start;
      background: rgba(0, 163, 196, 0.15);
      color: #007c97;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      margin-bottom: 14px;
    }
    .tier-title {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .tier-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      min-height: 48px;
    }
    .tier-specs {
      border-top: 1px dashed var(--border-color);
      padding-top: 20px;
      margin-bottom: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .tier-spec-row {
      display: flex;
      justify-content: space-between;
      font-size: 0.875rem;
    }
    .tier-spec-row span:first-child {
      color: var(--text-muted);
    }
    .tier-spec-row span:last-child {
      font-weight: 600;
      color: var(--text-dark);
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #cbd5e1;
      padding: 96px 0;
    }
    .section-dark .section-title {
      color: #ffffff;
    }
    .section-dark .section-desc {
      color: #94a3b8;
    }
    .dark-grid-layout {
      display: grid;
      grid-template-columns: 1fr 1.35fr;
      gap: 40px;
      align-items: center;
      margin-top: 48px;
    }
    .dark-topology-box {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 32px;
    }
    .dark-topology-box h3 {
      font-size: 1.35rem;
      color: #fff;
      margin-bottom: 16px;
    }
    .dark-comparison-table-wrapper {
      background: rgba(255, 255, 255, 0.03);
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.08);
      overflow-x: auto;
    }
    .dark-comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.93rem;
    }
    .dark-comparison-table th, .dark-comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .dark-comparison-table th {
      background: rgba(255, 255, 255, 0.06);
      color: #fff;
      font-weight: 600;
    }
    .dark-comparison-table tr:last-child td {
      border-bottom: none;
    }
    .dark-highlight-cell {
      color: #38bdf8;
      font-weight: 600;
    }
    .slot-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .slot-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .slot-card-media {
      height: 180px;
      overflow: hidden;
      position: relative;
    }
    .slot-card-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .slot-card:hover .slot-card-media img {
      transform: scale(1.05);
    }
    .slot-card-body {
      padding: 24px;
    }
    .slot-badge {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
      display: inline-block;
    }
    .slot-card-body h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }
    .slot-card-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .slot-kpi-row {
      display: flex;
      justify-content: space-between;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
      font-size: 0.8125rem;
      color: var(--text-dark);
      font-weight: 600;
    }
    .counter-bar-wrapper {
      background: linear-gradient(135deg, var(--primary), #0c3358);
      color: #fff;
      border-radius: var(--radius-md);
      padding: 44px 32px;
      box-shadow: 0 10px 30px rgba(15, 76, 129, 0.2);
    }
    .counter-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .counter-item h3 {
      font-size: 2.5rem;
      font-weight: 800;
      color: #38bdf8;
      margin-bottom: 4px;
    }
    .counter-item p {
      font-size: 0.9rem;
      color: #cbd5e1;
    }
    .team-lead-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .team-expert-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .team-expert-header {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 16px;
    }
    .team-avatar-icon {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: rgba(15, 76, 129, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
    }
    .team-expert-header h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .team-expert-header span {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }
    .expert-feedback-quote {
      font-size: 0.92rem;
      color: var(--text-body);
      line-height: 1.65;
      font-style: italic;
      position: relative;
    }
    .accordion-box {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question i {
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item:not(.active) .faq-answer {
      display: none;
    }
    .faq-item.active .faq-question i {
      transform: rotate(180deg);
    }
    .assurance-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .assurance-cell {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .assurance-cell i {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .assurance-cell h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 6px;
    }
    .assurance-cell p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .conversion-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 56px 48px;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background-color: #fdfdfd;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.12);
      background-color: #ffffff;
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .floating-cta-bar {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 999;
      background: rgba(15, 23, 42, 0.92);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 40px;
      padding: 8px 12px 8px 20px;
      display: flex;
      align-items: center;
      gap: 16px;
      box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
    }
    .floating-cta-bar p {
      font-size: 0.875rem;
      color: #f8fafc;
      font-weight: 500;
      margin: 0;
    }
    .floating-cta-bar a {
      background: var(--accent);
      color: #0b132b;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.8125rem;
      font-weight: 700;
    }
    .floating-cta-bar a:hover {
      background: #38bdf8;
    }
    .site-footer {
      background-color: #0b132b;
      color: #94a3b8;
      padding: 72px 0 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 56px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 20px;
      position: relative;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: #ffffff;
      padding-left: 4px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      text-align: center;
      font-size: 0.8125rem;
      color: #64748b;
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: center;
    }
    .footer-badges {
      display: flex;
      gap: 16px;
      margin-bottom: 8px;
    }
    @media (max-width: 1024px) {
      .hero-layout, .tech-intro-grid, .dark-grid-layout, .conversion-card {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .grid-3col, .slot-card-grid, .team-lead-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .counter-grid, .assurance-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .section-spacing {
        padding: 56px 0;
      }
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.08);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-cta-btn {
        display: none;
      }
      .hero-h1 {
        font-size: 2.15rem;
      }
      .grid-3col, .slot-card-grid, .team-lead-grid, .spec-indicator-list, .form-row {
        grid-template-columns: 1fr;
      }
      .counter-grid, .assurance-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .floating-cta-bar {
        left: 16px;
        right: 16px;
        justify-content: space-between;
      }
      .conversion-card {
        padding: 32px 20px;
      }
    }
    @media (max-width: 520px) {
      .hero-metrics {
        flex-direction: column;
        gap: 16px;
      }
      .hero-actions {
        flex-direction: column;
      }
      .btn-main, .btn-outline {
        width: 100%;
      }
    }