/* roulang page: index */
:root {
      --primary-color: #0F52BA;
      --primary-dark: #0A3A82;
      --primary-light: #EBF3FF;
      --accent-green: #10B981;
      --accent-orange: #F59E0B;
      --dark-bg: #0B1325;
      --slate-50: #F8FAFC;
      --slate-100: #F1F5F9;
      --slate-200: #E2E8F0;
      --slate-600: #475569;
      --slate-700: #334155;
      --slate-800: #1E293B;
      --slate-900: #0F172A;
      --font-stack: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    body {
      font-family: var(--font-stack);
      color: var(--slate-700);
      background-color: #ffffff;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    /* Top Utility Bar */
    .top-bar {
      background-color: var(--slate-900);
      color: #94A3B8;
      font-size: 0.825rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar a {
      color: #CBD5E1;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    .top-bar a:hover {
      color: #ffffff;
    }

    /* Main Navigation */
    .navbar {
      background: #ffffff;
      box-shadow: 0 4px 20px -4px rgba(15, 23, 42, 0.06);
      padding: 0.75rem 0;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.65rem;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--slate-900);
      text-decoration: none;
    }
    .brand-logo .brand-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary-color), #2563EB);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      font-size: 1.2rem;
    }
    .nav-link {
      font-weight: 500;
      color: var(--slate-700) !important;
      padding: 0.5rem 0.9rem !important;
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .nav-link:hover, .nav-link:focus {
      color: var(--primary-color) !important;
      background-color: var(--primary-light);
    }
    .dropdown-menu {
      border: 1px solid var(--slate-200);
      box-shadow: 0 16px 36px -8px rgba(15, 23, 42, 0.15);
      border-radius: 12px;
      padding: 1rem;
      min-width: 280px;
    }
    .dropdown-item {
      border-radius: 8px;
      padding: 0.6rem 0.85rem;
      font-size: 0.9rem;
    }
    .dropdown-item:hover {
      background-color: var(--primary-light);
      color: var(--primary-color);
    }

    /* Headings & Section Utilities */
    .section-padding {
      padding: 5rem 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 3.5rem 0;
      }
    }
    .bg-light-alt {
      background-color: var(--slate-50);
    }
    .section-badge {
      display: inline-block;
      padding: 0.35rem 0.9rem;
      background-color: var(--primary-light);
      color: var(--primary-color);
      font-size: 0.825rem;
      font-weight: 600;
      border-radius: 50px;
      margin-bottom: 0.75rem;
      letter-spacing: 0.5px;
    }
    .section-badge-dark {
      background-color: rgba(255, 255, 255, 0.12);
      color: #38BDF8;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      color: var(--slate-600);
      max-width: 680px;
      margin-bottom: 3rem;
      font-size: 1.05rem;
    }

    /* Bento Hero Section */
    .hero-section {
      background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
      padding: 4rem 0 5rem;
      position: relative;
      overflow: hidden;
    }
    .hero-main-card {
      background: linear-gradient(135deg, #092B60 0%, #0F52BA 100%);
      color: #ffffff;
      border-radius: 20px;
      padding: 3.5rem 3rem;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 40px -15px rgba(15, 82, 186, 0.35);
      min-height: 480px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .hero-main-card::after {
      content: "";
      position: absolute;
      top: 0; right: 0; bottom: 0; left: 0;
      background: url('/assets/images/bcd29b938b3e9a78.jpg') center/cover no-repeat;
      opacity: 0.18;
      mix-blend-mode: overlay;
      pointer-events: none;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: rgba(255, 255, 255, 0.15);
      backdrop-filter: blur(8px);
      padding: 0.4rem 1rem;
      border-radius: 50px;
      font-size: 0.85rem;
      margin-bottom: 1.5rem;
      width: fit-content;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 1.5rem;
      color: #ffffff;
    }
    .hero-desc {
      font-size: 1.1rem;
      line-height: 1.8;
      color: #E2E8F0;
      max-width: 620px;
      margin-bottom: 2rem;
    }
    .bento-card {
      background: #ffffff;
      border: 1px solid var(--slate-200);
      border-radius: 18px;
      padding: 2rem;
      height: 100%;
      box-shadow: 0 8px 24px -4px rgba(15, 23, 42, 0.05);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .bento-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -6px rgba(15, 23, 42, 0.1);
    }

    /* Buttons */
    .btn-brand {
      background-color: var(--primary-color);
      color: #ffffff;
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 1.75rem;
      border: none;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
    }
    .btn-brand:hover {
      background-color: var(--primary-dark);
      color: #ffffff;
      box-shadow: 0 8px 20px -4px rgba(15, 82, 186, 0.4);
    }
    .btn-light-custom {
      background-color: #ffffff;
      color: var(--slate-900);
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 1.75rem;
      text-decoration: none;
      transition: all 0.2s ease;
      border: 1px solid var(--slate-200);
    }
    .btn-light-custom:hover {
      background-color: var(--slate-50);
      color: var(--primary-color);
    }

    /* Card Layouts */
    .feature-card {
      background: #ffffff;
      border: 1px solid var(--slate-200);
      border-radius: 14px;
      padding: 2rem;
      height: 100%;
      transition: all 0.25s ease;
    }
    .feature-card:hover {
      border-color: #CBD5E1;
      box-shadow: 0 12px 28px -6px rgba(15, 23, 42, 0.08);
      transform: translateY(-3px);
    }
    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 1.25rem;
    }

    /* Steps */
    .step-item {
      position: relative;
      background: #ffffff;
      border: 1px solid var(--slate-200);
      border-radius: 12px;
      padding: 1.75rem;
    }
    .step-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: #93C5FD;
      line-height: 1;
      margin-bottom: 0.75rem;
    }

    /* Dark Showcase Section */
    .dark-showcase {
      background-color: var(--dark-bg);
      color: #CBD5E1;
      padding: 5.5rem 0;
    }
    .dark-card {
      background-color: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 16px;
      padding: 2.25rem;
    }

    /* Metrics Bar */
    .metrics-bar {
      background: linear-gradient(135deg, #0F52BA 0%, #1E40AF 100%);
      color: #ffffff;
      border-radius: 18px;
      padding: 3rem 2rem;
      box-shadow: 0 15px 35px -8px rgba(15, 82, 186, 0.35);
    }
    .metric-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: #6EE7B7;
      line-height: 1.1;
      margin-bottom: 0.4rem;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      color: var(--slate-900);
      padding: 1.25rem;
      background-color: #ffffff;
      border-radius: 8px !important;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary-color);
      background-color: var(--primary-light);
      box-shadow: none;
    }
    .accordion-item {
      border: 1px solid var(--slate-200);
      border-radius: 10px !important;
      margin-bottom: 0.85rem;
      overflow: hidden;
    }

    /* Footer */
    footer {
      background-color: var(--slate-900);
      color: #94A3B8;
      font-size: 0.9rem;
      padding-top: 4.5rem;
      padding-bottom: 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
    }
    footer a {
      color: #CBD5E1;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    footer a:hover {
      color: #ffffff;
    }
    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      margin: 3rem 0 1.5rem;
    }

    /* Responsive adjustments */
    @media (max-width: 991px) {
      .hero-title {
        font-size: 2.15rem;
      }
      .hero-main-card {
        padding: 2.25rem 1.75rem;
      }
    }