/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-hover: #1e40af;
      --secondary: #0284c7;
      --accent: #10b981;
      --dark: #0a192f;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-light: #f8fafc;
      --border-color: #e2e8f0;
    }
    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
      line-height: 1.65;
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(29, 78, 216, 0.75) 100%), url('/assets/images/d5061cf5561c5016.webp') center/cover no-repeat;
    }
    .dark-arch-bg {
      background: linear-gradient(180deg, #0a192f 0%, #0d213f 100%);
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      padding: 0.35rem 0.85rem;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 500;
    }
    .feature-card {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.12);
    }
    .faq-panel {
      transition: max-height 0.35s ease-out, padding 0.35s ease;
      max-height: 0;
      overflow: hidden;
    }
    .faq-panel.active {
      max-height: 280px;
    }
    .step-line::after {
      content: '';
      position: absolute;
      top: 28px;
      left: 50%;
      width: 100%;
      height: 2px;
      background: #cbd5e1;
      z-index: 0;
    }
    @media (max-width: 1024px) {
      .step-line::after {
        display: none;
      }
    }