/* roulang page: index */
/* 设计变量与全局样式补充 */
    :root {
      --primary: #A855F7;
      --accent: #14B8A6;
      --dark: #1A0A2E;
      --radius-card: 20px;
      --radius-btn: 12px;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      color: #1E1E2E;
      background-color: #F8F9FA;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    /* 导航 Mega Menu 增强 */
    .mega-trigger:hover .mega-panel,
    .mega-trigger:focus-within .mega-panel {
      opacity: 1;
      visibility: visible;
      transform: translateY(8px);
    }
    .mega-panel {
      opacity: 0;
      visibility: hidden;
      transition: all 0.25s ease;
      transform: translateY(16px);
    }
    /* 汉堡菜单动画 */
    #mobile-menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }
    .hamburger-line {
      transition: all 0.3s ease;
    }
    #mobile-menu-toggle:checked ~ .hamburger-icon .line1 {
      transform: rotate(45deg) translate(5px, 5px);
    }
    #mobile-menu-toggle:checked ~ .hamburger-icon .line2 {
      opacity: 0;
    }
    #mobile-menu-toggle:checked ~ .hamburger-icon .line3 {
      transform: rotate(-45deg) translate(5px, -5px);
    }
    /* 网格纹理背景（Hero） */
    .hero-grid-bg {
      background-image: 
        linear-gradient(rgba(168,85,247,0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(168,85,247,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    /* 卡片与交互过渡 */
    .card-hover {
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 28px rgba(168,85,247,0.15);
    }
    .service-card-hover {
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      border: 1px solid transparent;
    }
    .service-card-hover:hover {
      transform: translateY(-8px);
      border-color: #A855F7;
      box-shadow: 0 12px 28px rgba(168,85,247,0.15);
    }
    .case-img-zoom {
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-zoom {
      transform: scale(1.03);
    }
    /* FAQ 手风琴样式 */
    .faq-details summary::-webkit-details-marker {
      display: none;
    }
    .faq-details summary {
      list-style: none;
      cursor: pointer;
      transition: color 0.2s;
    }
    .faq-details summary:hover {
      color: #A855F7;
    }
    .faq-details[open] summary {
      color: #A855F7;
    }
    .faq-details[open] .faq-content {
      background-color: #F5F3FF;
    }
    .faq-arrow {
      transition: transform 0.3s ease;
    }
    .faq-details[open] .faq-arrow {
      transform: rotate(180deg);
    }
    /* 自定义滚动条隐藏 */
    .scroll-container {
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .scroll-container::-webkit-scrollbar {
      display: none;
    }
    /* 按钮与链接动画 */
    .btn-primary {
      background-color: #A855F7;
      transition: background-color 0.25s, transform 0.25s, box-shadow 0.25s;
    }
    .btn-primary:hover {
      background-color: #9333EA;
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(168,85,247,0.4);
    }
    .btn-outline {
      border: 2px solid #A855F7;
      color: #A855F7;
      background: transparent;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background-color: rgba(168,85,247,0.1);
      color: #9333EA;
    }
    .arrow-link {
      transition: transform 0.2s;
    }
    .arrow-link:hover {
      transform: translateX(4px);
    }