/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary: #0A0E0D;
      --accent: #D4F54C;
      --bg: #F7F8F6;
      --card-bg: #FFFFFF;
      --border: #E8EBE9;
      --text-primary: #0A0E0D;
      --text-secondary: #4A4F4D;
      --shadow-sm: 0 1px 3px rgba(10,14,13,0.04), 0 1px 2px rgba(10,14,13,0.06);
      --shadow-md: 0 4px 12px rgba(10,14,13,0.08);
      --radius: 12px;
      --radius-sm: 8px;
      --transition: 200ms ease-out;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航栏 SaaS 命令栏风格 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(247, 248, 246, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      z-index: 50;
      transition: var(--transition);
    }
    .nav-link {
      position: relative;
      color: var(--text-secondary);
      font-weight: 500;
      text-decoration: none;
      padding: 0.5rem 0;
      transition: color 150ms;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      transition: transform 200ms ease-out;
      transform-origin: center;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .btn-primary {
      background-color: var(--accent);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 0.7rem 1.75rem;
      transition: all 150ms ease-in-out;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background-color: #C2E63A;
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 0.7rem 1.75rem;
      transition: all 150ms ease-in-out;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #FFFFFF;
    }
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .section-padding {
      padding-top: 6rem;
      padding-bottom: 6rem;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding-top: 4rem;
        padding-bottom: 4rem;
      }
      h1 {
        font-size: 2.2rem !important;
      }
      h2 {
        font-size: 1.8rem !important;
      }
    }
    .hamburger-menu {
      display: none;
      cursor: pointer;
      font-size: 1.8rem;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger-menu {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--bg);
        z-index: 49;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transform: translateX(100%);
        transition: transform 300ms ease-in-out;
        display: flex;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 1.2rem 0;
      cursor: pointer;
      list-style: none;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-in-out;
      color: var(--text-secondary);
      background: #F7F8F6;
      border-radius: 0.5rem;
      margin-top: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1rem;
    }
    .faq-icon {
      color: var(--accent);
      font-weight: bold;
      font-size: 1.5rem;
      transition: transform 200ms;
    }
    .footer-link {
      color: #FFFFFF;
      text-decoration: none;
      transition: color 150ms;
      display: block;
      margin-bottom: 0.5rem;
    }
    .footer-link:hover {
      color: var(--accent);
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(212, 245, 76, 0.3);
    }
    .float-animation {
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
    }