:root {
    --fedjet-red: #F1302B;
    --fedjet-dark: #1a1a1a;
    --fedjet-gray: #f9f9f9;
    --fedjet-border: #e0e0e0;
    --fedjet-text: #333333;
    --fedjet-shadow-blur: rgba(241, 48, 43, 0.15);
  }

  /* 全局平滑滚动 */
  html {
    scroll-behavior: smooth;
  }

  .fedjet-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--fedjet-text);
    line-height: 1.6;
  }

  .fedjet-header {
    text-align: center;
    margin-bottom: 40px;
  }

  .fedjet-header h1 {
    font-size: 2.2rem;
    color: var(--fedjet-dark);
    margin-bottom: 15px;
    font-weight: 700;
  }

  .fedjet-divider {
    width: 80px;
    height: 4px;
    background-color: var(--fedjet-red);
    margin: 0 auto;
    /* 增加加载微动效 */
    animation: fedjetPulse 2s infinite ease-in-out;
  }

  @keyframes fedjetPulse {
    0% { transform: scaleX(1); opacity: 0.8; }
    50% { transform: scaleX(1.2); opacity: 1; }
    100% { transform: scaleX(1); opacity: 0.8; }
  }

  .fedjet-section {
    margin-bottom: 50px;
  }

  .fedjet-section h2 {
    font-size: 1.6rem;
    color: var(--fedjet-dark);
    border-left: 4px solid var(--fedjet-red);
    padding-left: 15px;
    margin-bottom: 25px;
    font-weight: 600;
  }

  /* RESPONSIVE GRID */
  .fedjet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
  }

  .fedjet-grid.cols-2 {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  }

  /* 核心特点卡片：引入悬停浮起、阴影与边框渐变交互 */
  .fedjet-card {
    background: var(--fedjet-gray);
    padding: 25px;
    border-radius: 6px;
    border-top: 3px solid var(--fedjet-red);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), 
                box-shadow 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), 
                background-color 0.3s ease;
    cursor: pointer;
  }

  .fedjet-card:hover {
    transform: translateY(-5px);
    background: #ffffff;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08), 0 4px 12px var(--fedjet-shadow-blur);
  }

  .fedjet-card h3 {
    font-size: 1.15rem;
    color: var(--fedjet-dark);
    margin-top: 0;
    margin-bottom: 12px;
    transition: color 0.2s ease;
  }

  .fedjet-card:hover h3 {
    color: var(--fedjet-red);
  }

  /* 核心优势与应用：悬停时光滑边框加深 */
  .fedjet-box {
    background: #ffffff;
    border: 1px solid var(--fedjet-border);
    padding: 25px;
    border-radius: 6px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
  }

  .fedjet-box:hover {
    border-color: rgba(241, 48, 43, 0.3);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
  }

  .fedjet-box ul {
    padding-left: 20px;
  }

  .fedjet-box li {
    margin-bottom: 12px;
  }

  .fedjet-box strong {
    color: var(--fedjet-red);
  }

  .fedjet-alert {
    background-color: rgba(241, 48, 43, 0.06);
    border: 1px dashed var(--fedjet-red);
    padding: 15px 20px;
    border-radius: 6px;
    margin-top: 25px;
    transition: background-color 0.3s ease;
  }
  
  .fedjet-alert:hover {
    background-color: rgba(241, 48, 43, 0.1);
  }

  /* 技术参数表格：引入行悬停高亮追踪 */
  .fedjet-table-wrapper {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--fedjet-border);
    border-radius: 6px;
  }

  .fedjet-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    min-width: 500px;
  }

  .fedjet-table th {
    background-color: var(--fedjet-red);
    color: #ffffff;
    padding: 14px 18px;
    font-weight: 600;
  }

  .fedjet-table td {
    padding: 12px 18px;
    border-bottom: 1px solid var(--fedjet-border);
    transition: background-color 0.15s ease;
  }

  .fedjet-table tr:last-child td {
    border-bottom: none;
  }

  .fedjet-table tr:nth-child(even) {
    background-color: var(--fedjet-gray);
  }

  /* 悬停整行时给予轻微背景加深提示，方便视线对齐阅读 */
  .fedjet-table tr:hover td {
    background-color: rgba(241, 48, 43, 0.04);
  }

  /* ACCORDION FAQ：优化手风琴开关动画与自定义交互指示器 */
  .fedjet-faq {
    background: var(--fedjet-gray);
    margin-bottom: 12px;
    border-radius: 6px;
    border: 1px solid var(--fedjet-border);
    overflow: hidden;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
  }

  .fedjet-faq:hover {
    border-color: rgba(241, 48, 43, 0.3);
  }

  /* 移除浏览器默认的三角形，改用更现代的右侧 '+' / '-' 旋转符号 */
  .fedjet-faq summary {
    padding: 16px 20px;
    font-weight: 600;
    cursor: pointer;
    color: var(--fedjet-dark);
    user-select: none;
    outline: none;
    transition: background-color 0.2s ease, color 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .fedjet-faq summary::-webkit-details-marker {
    display: none; /* 针对 Safari */
  }
  .fedjet-faq summary {
    list-style: none; /* 针对标准浏览器 */
  }

  /* 伪元素创建交互加号 */
  .fedjet-faq summary::after {
    content: '+';
    font-size: 1.3rem;
    line-height: 1;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s ease;
    color: #999;
  }

  .fedjet-faq summary:hover {
    background: rgba(241, 48, 43, 0.04);
    color: var(--fedjet-red);
  }
  
  .fedjet-faq summary:hover::after {
    color: var(--fedjet-red);
  }

  /* 激活展开状态 */
  .fedjet-faq[open] summary {
    background: rgba(241, 48, 43, 0.08);
    color: var(--fedjet-red);
    border-bottom: 1px solid var(--fedjet-border);
  }

  /* 展开时加号顺时针旋转 45 度变成关闭符号 (×) */
  .fedjet-faq[open] summary::after {
    transform: rotate(45deg);
    color: var(--fedjet-red);
  }

  /* 内容区展开滑出淡入感 */
  .faq-content {
    padding: 20px;
    background: #ffffff;
    animation: fedjetFadeIn 0.3s ease-out;
  }

  @keyframes fedjetFadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .faq-content p {
    margin: 0;
  }

  /* MOBILE OPTIMIZATIONS */
  @media (max-width: 768px) {
    .fedjet-header h1 {
      font-size: 1.6rem;
    }
    .fedjet-section h2 {
      font-size: 1.35rem;
    }
    .fedjet-container {
      padding: 12px;
    }
  }