/* 基础样式 */
  body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #0a2463, #1b365d, #27496d);
    color: #ffffff;
    overflow-x: hidden;
  }

  h1, h2, h3, h4, h5, h6 {
    font-family: 'Exo 2', sans-serif;
    color: #ffffff;
  }

  a {
    color: #00d2ff;
    text-decoration: none;
  }

  a:hover {
    text-decoration: underline;
  }

  /* 导航栏 */
  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.7);
    padding: 20px;
    display: flex;
    justify-content: space-around;
    z-index: 1000;
  }

  .navbar a {
    color: #00d2ff;
    font-size: 18px;
    transition: color 0.3s;
  }

  .navbar a:hover {
    color: #ff6ec7;
  }

  /* 主页头部 */
  .hero {
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
  }

  .hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 36, 99, 0.6);
  }

  .hero-content {
    position: relative;
    text-align: center;
    z-index: 1;
  }

  .hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    animation: fadeInDown 1s ease-out;
  }

  .hero-content p {
    font-size: 20px;
    animation: fadeInUp 1s ease-out;
  }

  /* 关键部分 */
  .section {
    padding: 60px 20px;
    max-width: 1200px;
    margin: auto;
  }

  .section:nth-child(even) {
    background: linear-gradient(135deg, #1b365d, #27496d);
  }

  .section h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 36px;
    position: relative;
  }

  .section h2::after {
    content: '';
    width: 60px;
    height: 4px;
    background: #00d2ff;
    display: block;
    margin: 10px auto 0;
  }

  .grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
  }

  .grid-item {
    flex: 1 1 calc(33.333% - 40px);
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    transition: transform 0.3s;
  }

  .grid-item:hover {
    transform: scale(1.05);
  }

  .grid-item img {
    width: 100%;
    border-radius: 10px;
  }

  .grid-item h3 {
    margin-top: 15px;
    font-size: 24px;
  }

  .grid-item p {
    font-size: 16px;
    margin-top: 10px;
  }

  /* 示例数据展示 */
  .example {
    background: #0a2463;
    padding: 40px 20px;
  }

  .example h2 {
    color: #ff6ec7;
    text-align: center;
    margin-bottom: 30px;
  }

  .example pre {
    background: #1b365d;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: #00d2ff;
  }

  /* 提示 */
  .tip {
    text-align: center;
    font-size: 18px;
    margin: 20px 0;
    color: #ff6ec7;
  }

  /* 响应式设计 */
  @media (max-width: 1200px) {
    .grid-item {
      flex: 1 1 calc(50% - 40px);
    }
  }

  @media (max-width: 768px) {
    .navbar {
      flex-direction: column;
    }

    .grid-item {
      flex: 1 1 100%;
    }

    .hero-content h1 {
      font-size: 32px;
    }

    .hero-content p {
      font-size: 16px;
    }
  }

  /* 动画效果 */
  @keyframes fadeInDown {
    from {
      opacity: 0;
      transform: translateY(-20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }