/* roulang page: index */
:root {
      --brand-primary: #1E6FFF;
      --brand-primary-hover: #1554C7;
      --brand-primary-light: #EBF3FF;
      --brand-dark: #0F172A;
      --brand-dark-deep: #0B1528;
      --brand-slate: #475569;
      --brand-muted: #94A3B8;
      --brand-border: #E2E8F0;
      --brand-bg: #F8FAFC;
      --brand-bg-pure: #FFFFFF;
      --brand-cyan: #06B6D4;
      --brand-amber: #F59E0B;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-pill: 9999px;
      --shadow-sm: 0 4px 12px -2px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 30px -5px rgba(15, 23, 42, 0.06), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 20px 40px -10px rgba(30, 111, 255, 0.16);
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    *, *::before, *::after {
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--brand-slate);
      background-color: var(--brand-bg);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      font-feature-settings: "tnum";
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--brand-dark);
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 0.75rem;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    .top-bar {
      height: 38px;
      background: var(--brand-dark);
      color: #CBD5E1;
      font-size: 13px;
      line-height: 38px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar a {
      color: #E2E8F0;
    }
    .top-bar a:hover {
      color: var(--brand-cyan);
    }

    .main-navbar {
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 16px rgba(15, 23, 42, 0.06);
      padding: 14px 0;
      transition: var(--transition);
    }
    .nav-logo-text {
      font-size: 22px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--brand-dark);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .nav-logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-cyan));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      font-size: 18px;
      box-shadow: 0 4px 10px rgba(30, 111, 255, 0.3);
    }
    .nav-link {
      font-size: 15px;
      font-weight: 600;
      color: #334155 !important;
      padding: 8px 14px !important;
      border-radius: var(--radius-sm);
    }
    .nav-link:hover, .nav-link.active {
      color: var(--brand-primary) !important;
      background: var(--brand-primary-light);
    }
    .dropdown-menu {
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      padding: 12px;
      min-width: 260px;
    }
    .dropdown-item {
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 500;
      color: var(--brand-slate);
    }
    .dropdown-item:hover {
      background-color: var(--brand-primary-light);
      color: var(--brand-primary);
    }

    .btn-brand-primary {
      background: linear-gradient(135deg, var(--brand-primary) 0%, #2563EB 100%);
      color: #FFFFFF;
      border: none;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-pill);
      box-shadow: 0 6px 18px rgba(30, 111, 255, 0.28);
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-brand-primary:hover {
      background: linear-gradient(135deg, var(--brand-primary-hover) 0%, #1D4ED8 100%);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(30, 111, 255, 0.36);
    }
    .btn-brand-outline {
      border: 1.5px solid var(--brand-primary);
      color: var(--brand-primary);
      background: #FFFFFF;
      font-weight: 600;
      padding: 9px 20px;
      border-radius: var(--radius-pill);
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-brand-outline:hover {
      background: var(--brand-primary-light);
      color: var(--brand-primary-hover);
      transform: translateY(-2px);
    }

    section {
      padding: 84px 0;
      position: relative;
    }
    @media (max-width: 768px) {
      section {
        padding: 52px 0;
      }
    }

    .section-title-wrap {
      margin-bottom: 52px;
      text-align: center;
    }
    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 700;
      color: var(--brand-primary);
      background: var(--brand-primary-light);
      border-radius: var(--radius-pill);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--brand-slate);
      max-width: 760px;
      margin: 0 auto;
      line-height: 1.8;
    }

    .app-card {
      background: var(--brand-bg-pure);
      border-radius: var(--radius-md);
      border: 1px solid var(--brand-border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      padding: 28px;
      height: 100%;
      position: relative;
    }
    .app-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: #BFDBFE;
    }

    .hero-banner-item {
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 110px 0;
      min-height: 640px;
      display: flex;
      align-items: center;
    }
    .hero-banner-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(255, 255, 255, 0.97) 0%, rgba(255, 255, 255, 0.92) 55%, rgba(255, 255, 255, 0.6) 100%);
    }
    @media (max-width: 992px) {
      .hero-banner-overlay {
        background: rgba(255, 255, 255, 0.94);
      }
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-trust-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid #E2E8F0;
      border-radius: var(--radius-pill);
      font-size: 13px;
      color: #334155;
      font-weight: 600;
    }

    .tech-table {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--brand-border);
      background: #FFFFFF;
    }
    .tech-table th, .tech-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--brand-border);
      font-size: 14px;
    }
    .tech-table th {
      background: #F1F5F9;
      color: var(--brand-dark);
      font-weight: 700;
      width: 32%;
    }
    .tech-table tr:last-child td, .tech-table tr:last-child th {
      border-bottom: none;
    }

    .bento-card-lg {
      background: linear-gradient(135deg, #FFFFFF 0%, #F8FAFC 100%);
      border-radius: var(--radius-md);
      border: 1px solid var(--brand-border);
      padding: 32px;
      height: 100%;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .bento-card-lg:hover {
      box-shadow: var(--shadow-hover);
      border-color: #93C5FD;
      transform: translateY(-4px);
    }

    .product-tier-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--brand-border);
      padding: 36px 28px;
      position: relative;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .product-tier-card.featured {
      border: 2px solid var(--brand-primary);
      box-shadow: 0 16px 36px -8px rgba(30, 111, 255, 0.22);
      transform: scale(1.03);
    }
    @media (max-width: 991px) {
      .product-tier-card.featured {
        transform: scale(1);
      }
    }
    .product-ribbon {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--brand-primary);
      color: #FFFFFF;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 18px;
      border-radius: var(--radius-pill);
      box-shadow: 0 4px 10px rgba(30, 111, 255, 0.35);
    }

    .stats-strip {
      background: linear-gradient(135deg, #EFF6FF 0%, #E0F2FE 100%);
      border: 1px solid #BAE6FD;
      border-radius: var(--radius-lg);
      padding: 42px 28px;
    }
    .stat-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--brand-primary);
      line-height: 1.1;
      letter-spacing: -1px;
    }

    .step-box {
      position: relative;
      padding: 24px 18px;
      background: #FFFFFF;
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-md);
      height: 100%;
      box-shadow: var(--shadow-sm);
    }
    .step-badge {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--brand-primary);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 18px;
      margin-bottom: 16px;
      box-shadow: 0 6px 14px rgba(30, 111, 255, 0.3);
    }

    .dark-section {
      background: var(--brand-dark-deep);
      color: #E2E8F0;
      border-top: 1px solid rgba(30, 111, 255, 0.25);
      border-bottom: 1px solid rgba(30, 111, 255, 0.25);
    }
    .dark-section h2, .dark-section h3, .dark-section h4 {
      color: #FFFFFF;
    }
    .dark-card {
      background: #162440;
      border: 1px solid rgba(147, 197, 253, 0.2);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      height: 100%;
    }
    .dark-card:hover {
      border-color: var(--brand-primary);
      transform: translateY(-4px);
      box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
    }

    .story-card {
      background: #FFFFFF;
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .story-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .review-bubble {
      background: #FFFFFF;
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      height: 100%;
      transition: var(--transition);
    }
    .review-bubble:hover {
      border-color: #BFDBFE;
      transform: translateY(-3px);
    }

    .partner-grid-item {
      background: #FFFFFF;
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-sm);
      padding: 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: var(--transition);
    }
    .partner-grid-item:hover {
      border-color: var(--brand-primary);
      transform: translateY(-2px);
    }

    .news-spotlight {
      background: #FFFFFF;
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      height: 100%;
    }
    .news-mini-item {
      background: #FFFFFF;
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-sm);
      padding: 18px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      cursor: pointer;
    }
    .news-mini-item:hover {
      border-color: var(--brand-primary);
      transform: translateX(4px);
    }

    .accordion-item {
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-md) !important;
      margin-bottom: 12px;
      overflow: hidden;
      background: #FFFFFF;
    }
    .accordion-button {
      font-weight: 700;
      color: var(--brand-dark);
      padding: 18px 24px;
      font-size: 16px;
    }
    .accordion-button:not(.collapsed) {
      color: var(--brand-primary);
      background-color: var(--brand-primary-light);
      box-shadow: none;
    }
    .accordion-body {
      padding: 20px 24px;
      color: var(--brand-slate);
      line-height: 1.8;
      font-size: 15px;
    }

    .trust-strip {
      background: #FFFFFF;
      border: 1px solid var(--brand-border);
      border-radius: var(--radius-md);
      padding: 24px 18px;
      box-shadow: var(--shadow-sm);
    }

    .cta-big-panel {
      background: linear-gradient(135deg, #1E6FFF 0%, #0F172A 100%);
      border-radius: var(--radius-lg);
      padding: 56px 42px;
      color: #FFFFFF;
      box-shadow: 0 20px 48px -10px rgba(30, 111, 255, 0.4);
    }
    .cta-form-box {
      background: rgba(255, 255, 255, 0.98);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
      color: var(--brand-dark);
    }

    footer {
      background: #0F172A;
      color: #94A3B8;
      padding-top: 72px;
      padding-bottom: 36px;
      border-top: 1px solid #1E293B;
      font-size: 14px;
    }
    footer h5 {
      color: #F8FAFC;
      font-size: 16px;
      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: #38BDF8;
      padding-left: 4px;
    }
    .footer-disclaimer-box {
      background: #1E293B;
      border-radius: var(--radius-sm);
      padding: 16px 20px;
      margin: 36px 0;
      font-size: 13px;
      line-height: 1.7;
      color: #CBD5E1;
    }