/* 全局样式 */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  body {
    font-family: 'Roboto', 'Open Sans', sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: #ffffff;
    line-height: 1.6;
    padding: 20px;
  }
  header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    margin-bottom: 30px;
  }
  header h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5em;
    margin-bottom: 10px;
    color: #ffffff;
  }
  nav a {
    color: #ffffff;
    text-decoration: none;
    margin: 0 15px;
    font-size: 1.1em;
    transition: color 0.3s ease;
  }
  nav a:hover {
    color: #00ffcc;
  }
  .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
  }
  .card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 60px rgba(0, 0, 0, 0.2);
  }
  h2, h3 {
    font-family: 'Poppins', sans-serif;
    color: #ffffff;
    margin-bottom: 15px;
  }
  p {
    margin-bottom: 15px;
    color: #e0e0e0;
  }
  pre {
    background: rgba(0, 0, 0, 0.5);
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    margin-bottom: 15px;
  }
  code {
    font-family: 'Courier New', Courier, monospace;
    color: #00ffcc;
  }
  table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 15px;
  }
  th, td {
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 10px;
    text-align: left;
  }
  th {
    background: rgba(0, 128, 255, 0.3);
  }
  img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    margin-bottom: 15px;
  }
  footer {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    color: #ffffff;
  }
  @keyframes aurora-move {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }
  body {
    background: linear-gradient(-45deg, #1e3c72, #2a5298, #00ffcc, #2a5298);
    background-size: 400% 400%;
    animation: aurora-move 15s linear infinite;
  }
  @media (max-width: 768px) {
    header h1 {
      font-size: 2em;
    }
    nav a {
      margin: 0 10px;
      font-size: 1em;
    }
  }
  @media (max-width: 480px) {
    .container {
      grid-template-columns: 1fr;
    }
    header h1 {
      font-size: 1.5em;
    }
  }