/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #1A3A5C;
      --primary-hover: #0F2A48;
      --accent: #C9A96E;
      --accent-hover: #B8944F;
      --bg: #F7F9FC;
      --bg-light: #EEF2F6;
      --text-main: #1E2A36;
      --text-muted: #5B6776;
      --cta: #E85D3F;
      --cta-hover: #c94a2f;
      --success: #2E7D5C;
      --success-bg: #E6F4EE;
      --before-bg: #EBEFF5;
      --white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(26,58,92,0.06), 0 1px 4px rgba(26,58,92,0.04);
      --card-shadow-hover: 0 8px 30px rgba(26,58,92,0.10), 0 2px 8px rgba(26,58,92,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    /* 导航栏 */
    #mainNav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: white;
      height: 64px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: box-shadow 0.3s;
    }
    #mainNav.scrolled {
      box-shadow: 0 1px 4px rgba(0,0,0,0.05);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo-text {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 24px;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo-text span {
      color: var(--accent);
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .desktop-nav a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }
    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--accent);
    }
    .desktop-nav a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-outline {
      border: 2px solid var(--accent);
      color: var(--primary);
      background: transparent;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--accent);
      color: white;
    }
    .btn-cta {
      background: var(--cta);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      width: 100%;
    }
    .btn-cta:hover {
      background: var(--cta-hover);
    }
    /* 移动端菜单按钮 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }
    #mobileMenu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: white;
      z-index: 100;
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      transition: right 0.3s ease;
      box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    }
    #mobileMenu.open {
      right: 0;
    }
    #mobileMenu .close-btn {
      align-self: flex-end;
      background: none;
      border: none;
      font-size: 28px;
      cursor: pointer;
      color: var(--text-main);
    }
    #mobileMenu a {
      font-size: 18px;
      font-weight: 500;
      padding: 16px 0;
      border-bottom: 1px solid #eee;
      color: var(--text-main);
    }
    #mobileMenu .mobile-cta {
      margin-top: 24px;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }
    /* 卡片通用样式 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      padding: 32px;
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid #e2e8f0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 600;
      color: var(--primary);
      cursor: pointer;
      font-size: 16px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #F7F9FC;
      border-radius: 8px;
      padding: 0 16px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
      margin-bottom: 16px;
    }
    /* 数字动画预留 */
    .count-up {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }
    @media (max-width: 576px) {
      .count-up {
        font-size: 40px;
      }
    }
    /* 底部悬浮CTA */
    .mobile-fixed-cta {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      padding: 12px 24px;
      box-shadow: 0 -4px 12px rgba(0,0,0,0.05);
      z-index: 40;
    }
    @media (max-width: 768px) {
      .mobile-fixed-cta {
        display: block;
      }
    }
    /* 页脚 */
    footer {
      background: #1A2B3C;
      color: #ddd;
      padding: 60px 0 30px;
    }
    footer a {
      color: #ccc;
    }
    footer a:hover {
      color: var(--accent);
    }