/* roulang page: index */
:root {
      --primary: #0A1F3F;
      --primary-light: #12305A;
      --accent: #C5A46B;
      --accent-light: #D4B87A;
      --bg-warm: #F9F7F4;
      --card-bg: #FFFFFF;
      --text-main: #1A202C;
      --text-secondary: #4A5568;
      --text-muted: #CBD5E0;
      --border-light: #E2E8F0;
      --red-accent: #8B2E3E;
      --shadow-card: 0 10px 30px -10px rgba(10, 31, 63, 0.08);
      --shadow-card-hover: 0 20px 40px -10px rgba(10, 31, 63, 0.15);
      --radius-md: 12px;
      --radius-btn: 8px;
      --transition-smooth: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      margin: 0;
      padding: 0;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 自定义导航样式 */
    .navbar {
      background-color: rgba(249, 247, 244, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: var(--transition-smooth);
      box-shadow: 0 1px 0 rgba(0,0,0,0.02);
    }
    .navbar.scrolled {
      background-color: #F9F7F4;
      box-shadow: 0 4px 20px rgba(10, 31, 63, 0.06);
    }
    .nav-link {
      color: var(--text-main);
      font-weight: 500;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link.active {
      color: var(--primary);
      font-weight: 600;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      border-radius: 2px;
    }

    /* 按钮 */
    .btn-primary {
      background-color: var(--primary);
      color: var(--accent);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2.5rem;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      text-decoration: none;
      box-shadow: 0 4px 10px rgba(10, 31, 63, 0.2);
    }
    .btn-primary:hover {
      background-color: var(--primary-light);
      color: var(--accent-light);
      box-shadow: 0 8px 20px rgba(10, 31, 63, 0.25);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2.5rem;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      overflow: hidden;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    /* 手风琴样式 */
    .faq-item {
      border: 1px solid var(--border-light);
      background: var(--card-bg);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 1.25rem 1.5rem;
      background: transparent;
      border: none;
      font-weight: 600;
      font-size: 1.125rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-main);
      transition: background 0.2s;
    }
    .faq-question:hover {
      background-color: #f8fafc;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      background-color: #ffffff;
      padding: 0 1.5rem;
      color: var(--text-secondary);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 400px;
      padding: 1rem 1.5rem 1.5rem;
    }
    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--accent);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 证言卡片 */
    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      min-width: 320px;
      max-width: 400px;
      flex-shrink: 0;
      scroll-snap-align: start;
    }

    /* 数字动画仅视觉表现 */
    .stat-number {
      color: var(--accent);
      font-weight: 800;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: #F9F7F4;
      backdrop-filter: blur(12px);
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      padding: 1rem 1.5rem;
      gap: 0.5rem;
    }
    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-hamburger {
        display: flex;
      }
      .testimonial-scroll {
        overflow-x: auto;
        gap: 1rem;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (min-width: 769px) {
      .mobile-hamburger {
        display: none;
      }
      .desktop-nav {
        display: flex;
      }
    }