/* roulang page: index */
:root {
      --primary: #1A3A5C;
      --secondary: #C8A96E;
      --bg: #F5F7FA;
      --accent: #E63946;
      --text-dark: #1E2D3D;
      --text-gray: #4B5563;
      --text-light: #6B7280;
      --white: #FFFFFF;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text-gray);
      line-height: 1.75;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    /* 桌面端左侧竖向导航 */
    .desktop-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: 240px;
      height: 100vh;
      background-color: var(--primary);
      color: white;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      z-index: 40;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
      padding: 2rem 1.5rem;
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin-bottom: 2.5rem;
    }
    .nav-brand .logo-icon {
      font-size: 2rem;
      color: var(--secondary);
    }
    .nav-brand span {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: white;
    }

    .nav-menu {
      list-style: none;
      padding: 0;
      margin: 0;
      flex: 1;
    }
    .nav-menu li {
      margin-bottom: 0.5rem;
    }
    .nav-menu a {
      display: block;
      padding: 0.75rem 1rem;
      color: rgba(255,255,255,0.8);
      text-decoration: none;
      font-weight: 500;
      border-radius: 6px;
      transition: var(--transition);
      border-left: 3px solid transparent;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      background-color: rgba(255,255,255,0.08);
      color: var(--secondary);
      border-left-color: var(--secondary);
    }

    .nav-social {
      display: flex;
      gap: 1.2rem;
      font-size: 1.3rem;
      color: rgba(255,255,255,0.7);
      margin-top: 2rem;
    }
    .nav-social a {
      color: inherit;
      transition: var(--transition);
    }
    .nav-social a:hover {
      color: var(--secondary);
    }

    /* 右侧主内容区 */
    .main-content {
      margin-left: 240px;
      width: calc(100% - 240px);
      flex: 1;
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background-color: var(--primary);
      color: white;
      z-index: 50;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.5rem;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    .mobile-brand {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      font-weight: 700;
      font-size: 1.2rem;
    }
    .hamburger {
      font-size: 1.8rem;
      cursor: pointer;
      background: none;
      border: none;
      color: white;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 60px;
      left: 0;
      width: 100%;
      background-color: var(--primary);
      flex-direction: column;
      padding: 1.5rem;
      z-index: 49;
      box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    }
    .mobile-menu a {
      color: white;
      padding: 0.8rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.15);
      text-decoration: none;
      font-weight: 500;
    }
    .mobile-menu a:hover {
      color: var(--secondary);
    }

    /* 通用容器 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    section {
      padding: 5rem 0;
    }

    /* 卡片与组件 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .btn-primary {
      background-color: var(--primary);
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background-color: var(--secondary);
      box-shadow: 0 6px 18px rgba(0,0,0,0.15);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
    }

    .tag {
      background-color: rgba(200,169,110,0.15);
      color: #8B6F3B;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 600;
      color: var(--primary);
      padding: 1rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 4px solid var(--secondary);
      padding-left: 1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background-color: #F8FAFB;
      padding: 0 1rem;
      color: var(--text-gray);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1rem;
    }

    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 60px;
      }
      .container-custom {
        padding: 0 1.5rem;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 3rem 0;
      }
      .grid-cols-3 {
        grid-template-columns: 1fr;
      }
      .hero-flex {
        flex-direction: column;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }