/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary: #0A2342;
      --accent-green: #00E5A1;
      --accent-orange: #FF6B35;
      --bg-light: #F7F9FC;
      --white: #FFFFFF;
      --gray-text: #4A5568;
      --gray-light: #CBD5E0;
      --card-shadow: 0 4px 24px rgba(10,35,66,0.06);
      --card-hover-shadow: 0 8px 32px rgba(10,35,66,0.12);
      --border-light: #E2E8F0;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-pill: 40px;
      --transition: 0.25s ease;
      --font-mono: 'Inter', 'SF Mono', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: #1A202C;
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.01em;
    }
    h1 {
      font-size: 3rem;
      line-height: 1.2;
      font-weight: 800;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      padding: 0.75rem 0;
    }
    .nav-link {
      color: #4A5568;
      font-size: 0.95rem;
      font-weight: 500;
      transition: color 0.2s;
      text-decoration: none;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
      border-bottom-color: var(--accent-green);
    }
    .btn-primary {
      background: var(--accent-green);
      color: var(--primary);
      font-weight: 700;
      border-radius: var(--radius-pill);
      padding: 0.6rem 1.8rem;
      transition: background 0.25s, box-shadow 0.25s, transform 0.15s;
      border: none;
      cursor: pointer;
      display: inline-block;
      text-decoration: none;
      box-shadow: 0 4px 10px rgba(0,229,161,0.25);
    }
    .btn-primary:hover {
      background: #00C98C;
      box-shadow: 0 8px 18px rgba(0,229,161,0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 0.6rem 1.8rem;
      transition: all 0.25s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      border-color: var(--accent-green);
      background: rgba(0,229,161,0.08);
      color: var(--primary);
    }
    /* 卡片与动效 */
    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .badge-tech {
      background: #EDF2F7;
      color: var(--primary);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.3px;
      display: inline-block;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.25rem;
      font-weight: 600;
      color: var(--accent-green);
    }
    .accent-orange-text {
      color: var(--accent-orange);
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 1rem 0;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #F1F5F9;
      padding-left: 0.5rem;
      border-radius: 8px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #4A5568;
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1rem;
    }
    .faq-icon {
      width: 28px;
      height: 28px;
      background: #E2E8F0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
      transition: 0.2s;
    }
    .faq-item.active .faq-icon {
      background: var(--accent-green);
      color: #0A2342;
    }
    /* 移动端菜单 */
    #mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      padding: 1rem;
      border-radius: 12px;
      margin-top: 1rem;
      box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
    }
    @media (min-width: 769px) {
      .mobile-toggle {
        display: none;
      }
    }