/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary: #0F9B4E;
      --primary-hover: #0B7A3D;
      --secondary: #1E1E1E;
      --accent: #F57C00;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-main: #1E1E1E;
      --text-muted: #5A6D7C;
      --border-light: #E9EDF0;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 22px rgba(0,0,0,0.08);
      --radius-md: 10px;
      --radius-sm: 8px;
      --transition: all 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      margin: 0;
      display: flex;
      min-height: 100vh;
    }
    /* 左侧 App Shell 导航 */
    .app-nav {
      width: 220px;
      background-color: var(--secondary);
      color: white;
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      display: flex;
      flex-direction: column;
      padding: 1.8rem 0;
      z-index: 40;
      box-shadow: 2px 0 10px rgba(0,0,0,0.08);
    }
    .nav-logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      padding: 0 1.8rem 2rem;
      color: white;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      margin-bottom: 2rem;
    }
    .nav-logo span {
      color: var(--primary);
    }
    .nav-menu {
      list-style: none;
      padding: 0;
      margin: 0;
      flex: 1;
    }
    .nav-item {
      margin-bottom: 0.25rem;
    }
    .nav-link {
      display: block;
      padding: 0.75rem 1.8rem;
      color: rgba(255,255,255,0.75);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      border-left: 3px solid transparent;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      background-color: rgba(255,255,255,0.05);
      color: white;
      border-left-color: var(--primary);
    }
    .main-content {
      margin-left: 220px;
      width: 100%;
      max-width: 100%;
    }
    /* 移动端导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--secondary);
      color: white;
      z-index: 50;
      padding: 0.8rem 1.2rem;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    }
    #menu-toggle {
      background: none;
      border: none;
      color: white;
      font-size: 1.6rem;
      cursor: pointer;
    }
    .mobile-drawer {
      display: none;
      position: fixed;
      top: 60px;
      left: 0;
      width: 100%;
      background: var(--secondary);
      z-index: 49;
      flex-direction: column;
      padding: 1rem 0;
    }
    .mobile-drawer a {
      color: white;
      padding: 0.8rem 1.5rem;
      text-decoration: none;
      border-left: 3px solid transparent;
    }
    .mobile-drawer a:hover {
      background: rgba(255,255,255,0.08);
      border-left-color: var(--primary);
    }
    /* 排版与组件 */
    .container-main {
      max-width: 1000px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    section {
      padding: 4.5rem 0;
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 1.8rem;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 500;
      padding: 0.8rem 1.8rem;
      border-radius: var(--radius-sm);
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--secondary);
      background: transparent;
      color: var(--secondary);
      padding: 0.8rem 1.8rem;
      border-radius: var(--radius-sm);
      font-weight: 500;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: white;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .accent-number {
      color: var(--accent);
      font-weight: 700;
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 1.2rem 0;
      text-align: left;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 1rem;
    }
    @media (max-width: 768px) {
      body {
        flex-direction: column;
      }
      .app-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        margin-top: 60px;
      }
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.7rem;
      }
      .container-main {
        padding: 0 1.2rem;
      }
      section {
        padding: 3rem 0;
      }
      .hero-flex {
        flex-direction: column;
      }
    }