/* roulang page: index */
/* 自定义 CSS 变量与全局微调 */
    :root {
      --primary: #0F4C81;       /* 商务蓝主色 */
      --primary-dark: #0A3A62;
      --primary-light: #e8f1fa;
      --accent: #2B7FC9;        /* 高亮蓝 */
      --success: #10B981;
      --warning: #F59E0B;
      --text-main: #1E293B;
      --text-secondary: #475569;
      --text-weak: #64748B;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --border-light: #E2E8F0;
      --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
      --shadow-hover: 0 20px 30px -10px rgba(15, 76, 129, 0.12), 0 8px 15px -6px rgba(15, 76, 129, 0.08);
      --radius-md: 1rem;
      --radius-lg: 1.5rem;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    /* 容器与留白 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    @media (min-width: 768px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }

    /* 导航样式 */
    .navbar {
      background-color: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 6px rgba(0,0,0,0.02);
      border-bottom: 1px solid var(--border-light);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: all 0.2s ease;
    }

    .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      transition: color 0.2s, border-bottom 0.2s;
      text-decoration: none;
      padding: 0.5rem 0.15rem;
      border-bottom: 2px solid transparent;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    /* 卡片通用 */
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.25s ease, transform 0.25s ease;
      border: 1px solid rgba(226, 232, 240, 0.6);
    }

    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    /* 数据看板数字 */
    .stat-number {
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.02em;
    }

    /* 按钮体系 */
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: 2.5rem;
      padding: 0.75rem 2rem;
      font-weight: 600;
      box-shadow: 0 8px 18px -8px rgba(15, 76, 129, 0.35);
      transition: all 0.25s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background-color: var(--primary-dark);
      box-shadow: 0 12px 22px -8px rgba(15, 76, 129, 0.45);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      border-radius: 2.5rem;
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background-color: var(--primary-light);
      border-color: var(--primary-dark);
    }

    /* 图片遮罩与背景 */
    .hero-background {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      position: relative;
    }

    .hero-overlay {
      background: linear-gradient(90deg, rgba(248,250,252,0.92) 0%, rgba(248,250,252,0.7) 60%, rgba(15,76,129,0.15) 100%);
      position: absolute;
      inset: 0;
    }

    /* 服务卡片内图片 */
    .service-img {
      height: 200px;
      object-fit: cover;
      border-radius: 0.75rem 0.75rem 0 0;
    }

    /* FAQ 手风琴效果简易 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }

    @media (max-width: 767px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }

    /* 汉堡按钮 */
    #menu-toggle:checked ~ .mobile-nav-collapse {
      display: flex;
    }

    .mobile-nav-collapse {
      display: none;
      flex-direction: column;
      background: white;
      padding: 1rem 1.5rem;
      border-top: 1px solid var(--border-light);
    }