/* 全局样式 */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: 'Roboto', sans-serif;
    color: #ffffff;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    line-height: 1.6;
    padding: 20px;
  }

  h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    color: #ffcc00;
    margin-bottom: 15px;
  }

  h1 {
    font-size: 2.5em;
    text-align: center;
    margin-top: 20px;
    animation: fadeInDown 1s ease-out;
  }

  h2 {
    font-size: 2em;
    margin-top: 40px;
  }

  h3 {
    font-size: 1.5em;
    margin-top: 30px;
  }

  h4 {
    font-size: 1.2em;
    margin-top: 20px;
  }

  p {
    font-size: 1em;
    margin-bottom: 20px;
    color: #f0f0f0;
  }

  a {
    color: #ff66cc;
    text-decoration: none;
    transition: color 0.3s ease;
  }

  a:hover {
    color: #ffcc00;
  }

  ul, ol {
    margin-left: 20px;
    margin-bottom: 20px;
  }

  li {
    margin-bottom: 10px;
  }

  pre {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
  }

  code {
    font-family: 'Courier New', Courier, monospace;
    color: #ffcc00;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
  }

  th, td {
    border: 1px solid #ff66cc;
    padding: 10px;
    text-align: left;
  }

  th {
    background: #2a5298;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
  }

  .card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid #ffcc00;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
  }

  .image-grid img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    object-fit: cover;
  }

  .highlight {
    background: rgba(255, 204, 0, 0.2);
    padding: 5px 10px;
    border-radius: 5px;
    color: #ffffff;
  }

  .footer {
    text-align: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid #ffcc00;
    margin-top: 40px;
  }

  /* 动画效果 */
  @keyframes fadeInDown {
    from {
      opacity: 0;
      transform: translateY(-50px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @media (max-width: 320px) {
    h1 {
      font-size: 1.8em;
    }
    h2 {
      font-size: 1.5em;
    }
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 480px) {
    h1 {
      font-size: 2em;
    }
    h2 {
      font-size: 1.6em;
    }
    h3 {
      font-size: 1.3em;
    }
  }

  @media (max-width: 768px) {
    .container {
      padding: 10px;
    }
    .image-grid {
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
  }

  @media (max-width: 1024px) {
    h1 {
      font-size: 2.2em;
    }
    h2 {
      font-size: 1.8em;
    }
  }

  @media (min-width: 1200px) {
    .container {
      padding: 40px;
    }
  }

  @media (min-width: 1440px) {
    h1 {
      font-size: 3em;
    }
    h2 {
      font-size: 2.5em;
    }
  }