/* roulang page: index */
:root {
      --primary: #1A3C5E;
      --primary-light: #2D6A9F;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-soft: #F1F5F9;
      --text-main: #111111;
      --text-body: #334155;
      --text-muted: #64748B;
      --accent-green: #0F7B4E;
      --border-light: #E2E8F0;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 6px 20px rgba(0,0,0,0.10);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 卡片通用样式 */
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    /* 导航卡片面板 */
    .nav-panel {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
      padding: 0.75rem 1.5rem;
    }
    .nav-item {
      border-radius: 12px;
      padding: 0.5rem 1rem;
      font-weight: 500;
      color: var(--text-body);
      transition: all 0.2s;
    }
    .nav-item:hover {
      background-color: #E8F0FE;
      color: var(--primary);
    }
    .btn-primary {
      background-color: var(--primary-light);
      color: white;
      font-weight: 600;
      border-radius: 12px;
      padding: 0.75rem 1.5rem;
      box-shadow: 0 4px 8px rgba(0,0,0,0.06);
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: var(--primary);
      box-shadow: 0 8px 16px rgba(0,0,0,0.1);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-light);
      color: var(--primary-light);
      font-weight: 600;
      border-radius: 12px;
      padding: 0.75rem 1.5rem;
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: #EBF3FA;
      border-color: var(--primary);
      color: var(--primary);
    }
    .section-title {
      color: var(--primary);
      font-size: 2rem;
      font-weight: 600;
      line-height: 1.3;
    }
    .text-highlight {
      color: var(--accent-green);
      font-weight: 700;
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.25rem 0;
      font-weight: 600;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: #F1F5F9;
      border-radius: 12px;
      margin-bottom: 0.5rem;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 1.25rem;
    }
    /* 响应式调整 */
    @media (max-width: 768px) {
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }
      .section-title {
        font-size: 1.5rem;
      }
      .nav-panel {
        flex-wrap: wrap;
      }
      .mobile-menu {
        display: block;
      }
      .desktop-menu {
        display: none;
      }
    }
    @media (min-width: 769px) {
      .mobile-menu {
        display: none;
      }
      .desktop-menu {
        display: flex;
      }
    }
    /* 汉堡菜单简易处理 */
    #mobileMenuContent {
      transition: all 0.3s;
    }