/* roulang page: index */
:root {
      --primary: #111827;
      --brand: #00D084;
      --brand-hover: #00b371;
      --accent: #FF6B35;
      --accent-hover: #e85a26;
      --surface-light: #F8FAFC;
      --surface-card: #FFFFFF;
      --surface-dark: #0B0F17;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border-color: rgba(0, 0, 0, 0.08);
      --radius: 8px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.75;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
    }
    a {
      text-decoration: none;
      transition: var(--transition);
    }
    .top-bar {
      background-color: #0F172A;
      color: #94A3B8;
      font-size: 0.85rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar a {
      color: #CBD5E1;
    }
    .top-bar a:hover {
      color: var(--brand);
    }
    .main-nav {
      background: #FFFFFF;
      box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      position: sticky;
      top: 0;
      z-index: 1030;
      padding: 12px 0;
    }
    .navbar-brand {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .navbar-brand i {
      color: var(--brand);
      font-size: 1.6rem;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: #334155 !important;
      padding: 8px 14px !important;
      border-radius: 6px;
    }
    .nav-link:hover {
      color: var(--brand) !important;
      background-color: rgba(0, 208, 132, 0.06);
    }
    .btn-brand {
      background-color: var(--brand);
      color: #0F172A;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 6px;
      border: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-brand:hover {
      background-color: var(--brand-hover);
      color: #000000;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(0, 208, 132, 0.25);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 6px;
      border: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(255, 107, 53, 0.3);
    }
    .btn-outline-dark-custom {
      border: 1.5px solid #CBD5E1;
      color: #1E293B;
      font-weight: 600;
      padding: 9px 20px;
      border-radius: 6px;
      background: transparent;
      transition: var(--transition);
    }
    .btn-outline-dark-custom:hover {
      border-color: #0F172A;
      background-color: #0F172A;
      color: #FFFFFF;
    }
    .section-wrap {
      padding: 80px 0;
    }
    .section-alt {
      background-color: var(--surface-light);
    }
    .section-dark {
      background-color: var(--surface-dark);
      color: #F8FAFC;
    }
    .section-dark h2, .section-dark h3, .section-dark h4 {
      color: #FFFFFF;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      border-radius: 20px;
      background-color: rgba(0, 208, 132, 0.12);
      color: #00965e;
      margin-bottom: 12px;
    }
    .section-dark .section-badge {
      background-color: rgba(0, 208, 132, 0.2);
      color: var(--brand);
    }
    .custom-card {
      background: #FFFFFF;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      transition: var(--transition);
      height: 100%;
      overflow: hidden;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -4px rgba(0, 0, 0, 0.1);
      border-color: rgba(0, 208, 132, 0.4);
    }
    .hero-section {
      background: linear-gradient(135deg, rgba(17, 24, 39, 0.95), rgba(15, 23, 42, 0.9)), url('/assets/images/79872adf5f6d168e.jpg') center/cover no-repeat;
      color: #FFFFFF;
      padding: 90px 0;
      position: relative;
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #FFFFFF;
      margin-bottom: 20px;
    }
    .hero-badge-tag {
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: #E2E8F0;
      padding: 4px 12px;
      border-radius: 4px;
      font-size: 0.85rem;
      margin-right: 8px;
      margin-bottom: 8px;
      display: inline-block;
    }
    .hero-img-box {
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .hero-img-box img {
      width: 100%;
      height: 420px;
      object-fit: cover;
      display: block;
    }
    .kpi-number {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1;
      color: #0F172A;
    }
    .kpi-label {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-top: 8px;
    }
    .code-console {
      background: #05070A;
      border: 1px solid rgba(0, 208, 132, 0.3);
      border-radius: 8px;
      padding: 20px;
      font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
      font-size: 0.85rem;
      color: #A7F3D0;
    }
    .code-console pre {
      margin: 0;
      color: inherit;
    }
    .footer-section {
      background-color: #0A0E17;
      color: #94A3B8;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .footer-title {
      color: #FFFFFF;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94A3B8;
    }
    .footer-links a:hover {
      color: var(--brand);
    }
    .accordion-button:not(.collapsed) {
      color: #0F172A;
      background-color: rgba(0, 208, 132, 0.08);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: rgba(0, 208, 132, 0.4);
    }
    @media (max-width: 991.98px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .section-wrap {
        padding: 55px 0;
      }
      .hero-img-box img {
        height: 280px;
      }
    }