:root {
    --primary: #1E90FF;
    --secondary: #F5F5F5;
    --accent: #FFA500;
    --text: #333333;
    --white: #FFFFFF;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: 'Roboto', 'Helvetica', sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--white) 100%);
    background-attachment: fixed;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .tech-banner {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(45deg, rgba(30, 144, 255, 0.8), rgba(245, 245, 245, 0.9));
    margin-bottom: 60px;
    overflow: hidden;
    border-radius: 0 0 30px 30px;
    box-shadow: var(--shadow);
  }

  .tech-banner::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.15;
  }

  .banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px;
    max-width: 800px;
  }

  .banner-content h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    color: var(--white);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  .banner-content p {
    font-size: 1.2rem;
    color: var(--white);
    margin-bottom: 30px;
  }

  .notice {
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--primary);
    padding: 15px;
    border-radius: 8px;
    margin: 30px auto;
    max-width: 800px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    font-weight: bold;
  }

  article {
    background-color: var(--white);
    border-radius: 20px;
    padding: 40px;
    margin: 40px auto;
    box-shadow: var(--shadow);
    max-width: 900px;
  }

  article h2 {
    color: var(--primary);
    font-size: 2rem;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
  }

  article h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
  }

  article h3 {
    color: var(--primary);
    font-size: 1.5rem;
    margin: 30px 0 15px;
  }

  article p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
  }

  pre {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 10px;
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.05);
    border-left: 4px solid var(--primary);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #333;
    font-size: 0.9rem;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 40px 0;
  }

  .tech-image {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    height: 250px;
    background-size: cover;
    background-position: center;
    position: relative;
  }

  .tech-image::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(30, 144, 255, 0.3), rgba(255, 165, 0, 0.2));
    opacity: 0;
    transition: var(--transition);
  }

  .tech-image:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  }

  .tech-image:hover::after {
    opacity: 1;
  }

  .tech-card {
    background: var(--white);
    border-radius: 15px;
    padding: 30px;
    margin: 30px 0;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(30, 144, 255, 0.1);
  }

  .tech-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
    border-color: rgba(30, 144, 255, 0.3);
  }

  .nav-pills {
    position: sticky;
    top: 20px;
    margin-bottom: 40px;
    background: var(--white);
    padding: 15px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    z-index: 100;
  }

  .nav-pills ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
    gap: 15px;
  }

  .nav-pills a {
    color: var(--primary);
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 30px;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
  }

  .nav-pills a:hover {
    background-color: rgba(30, 144, 255, 0.1);
    border-color: var(--primary);
  }

  .summary {
    background: linear-gradient(135deg, rgba(30, 144, 255, 0.05), rgba(255, 165, 0, 0.05));
    padding: 30px;
    border-radius: 15px;
    margin: 40px 0;
    border-left: 5px solid var(--primary);
  }

  @media (max-width: 768px) {
    .tech-banner {
      height: 300px;
    }
    
    .banner-content h1 {
      font-size: 2rem;
    }
    
    article {
      padding: 25px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }