/* roulang page: index */
/* 设计变量与深度自定义，超越默认Tailwind风格 */
    :root {
      --primary: #E94E1B;
      --primary-hover: #C94016;
      --primary-soft: #FDE8E0;
      --secondary: #1E1E24;
      --accent-gold: #D4A843;
      --bg-warm: #F5F0EB;
      --card-white: #FFFFFF;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --text-on-dark: #FFFFFF;
      --border-light: #E2E0DD;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-stack);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    
    /* 容器最大宽度与留白 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 导航栏沉浸式效果 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background-color 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
      background-color: rgba(30, 30, 36, 0.7);
      backdrop-filter: blur(8px);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      background-color: rgba(30, 30, 36, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      backdrop-filter: blur(12px);
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
    }
    .nav-logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }
    .nav-link {
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background-color 0.2s, box-shadow 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      font-size: 0.95rem;
      box-shadow: 0 2px 8px rgba(233,78,27,0.3);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(233,78,27,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.55rem 1.75rem;
      border-radius: var(--radius-btn);
      transition: all 0.2s;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background-color: var(--primary-soft);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    .btn-white {
      background-color: white;
      color: var(--primary);
      font-weight: 700;
      padding: 0.8rem 2.4rem;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1.1rem;
      transition: background-color 0.2s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-white:hover {
      background-color: #f0f0f0;
    }
    
    /* 卡片样式 */
    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      overflow: hidden;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    /* 手风琴FAQ */
    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: 8px;
      margin-bottom: 12px;
      background: white;
      transition: all 0.2s;
    }
    .faq-item.active {
      border-left: 4px solid var(--primary);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      font-size: 1.1rem;
      text-align: left;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--secondary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      padding: 0 1.5rem;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 1.5rem 1.2rem;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(30,30,36,0.98);
      backdrop-filter: blur(20px);
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      padding: 2rem;
      z-index: 40;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.4rem;
      padding: 1rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.15);
      text-decoration: none;
    }
    
    @media (max-width: 768px) {
      .navbar {
        height: 64px;
      }
      .desktop-menu {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
    }