@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  
  :root {
    --primary: #1E90FF;
    --accent: #FF8C00;
    --secondary: #32CD32;
    --neutral: #F5F5F5;
    --dark: #333;
    --light: #FFF;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Roboto', sans-serif;
    background: var(--neutral);
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  header {
    background: linear-gradient(135deg, var(--primary), #0066CC);
    color: white;
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
  }
  
  header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover;
    opacity: 0.1;
  }
  
  .header-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
  }
  
  h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }
  
  .tagline {
    font-size: 1.2rem;
    margin-bottom: 30px;
    font-weight: 300;
  }
  
  .reference-note {
    background: rgba(255, 255, 255, 0.2);
    padding: 10px 20px;
    border-radius: 30px;
    display: inline-block;
    font-size: 0.9rem;
    backdrop-filter: blur(5px);
    margin-top: 20px;
  }
  
  .nav-container {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
  }
  
  .nav-links {
    display: flex;
    gap: 30px;
  }
  
  .nav-links a {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: color 0.3s ease;
  }
  
  .nav-links a:hover {
    color: var(--primary);
  }
  
  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
  }
  
  .nav-links a:hover::after {
    width: 100%;
  }
  
  .hero-image {
    width: 100%;
    height: 400px;
    background: url('https://images.gptkong.com/demo/sample2.png') no-repeat center/cover;
    border-radius: 10px;
    margin: 40px 0;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
  }
  
  .hero-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(30, 144, 255, 0.3), rgba(255, 140, 0, 0.3));
  }
  
  article {
    background: white;
    border-radius: 10px;
    padding: 40px;
    margin: 40px 0;
    box-shadow: var(--shadow);
  }
  
  h2 {
    color: var(--primary);
    font-size: 1.8rem;
    margin: 30px 0 20px;
    position: relative;
    padding-bottom: 10px;
  }
  
  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, var(--primary), var(--accent));
  }
  
  h3 {
    color: var(--accent);
    font-size: 1.4rem;
    margin: 25px 0 15px;
  }
  
  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }
  
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }
  
  .image-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  
  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  }
  
  .image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
  }
  
  pre {
    background: #282c34;
    color: #abb2bf;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    overflow-x: auto;
    font-size: 0.9rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }
  
  code {
    font-family: 'Courier New', monospace;
  }
  
  .code-header {
    background: #21252b;
    color: #abb2bf;
    padding: 10px 15px;
    border-radius: 8px 8px 0 0;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
  }
  
  .code-header::before {
    content: '•••';
    color: #abb2bf;
    margin-right: 10px;
    letter-spacing: 2px;
  }
  
  .floating-assistant {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: transform 0.3s ease;
    z-index: 10;
  }
  
  .floating-assistant:hover {
    transform: scale(1.1);
  }
  
  .floating-assistant::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    animation: pulse 2s infinite;
  }
  
  @keyframes pulse {
    0% {
      transform: scale(0.8);
      opacity: 0.7;
    }
    70% {
      transform: scale(1.3);
      opacity: 0;
    }
    100% {
      transform: scale(0.8);
      opacity: 0;
    }
  }
  
  footer {
    background: var(--dark);
    color: white;
    padding: 40px 0;
    text-align: center;
  }
  
  .footer-content {
    max-width: 800px;
    margin: 0 auto;
  }
  
  .footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0;
  }
  
  .footer-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
  }
  
  .footer-links a:hover {
    color: var(--accent);
  }
  
  @media (max-width: 768px) {
    .nav-links {
      gap: 15px;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    .hero-image {
      height: 300px;
    }
    
    article {
      padding: 30px;
    }
  }
  
  @media (max-width: 480px) {
    .nav-links {
      flex-direction: column;
      gap: 10px;
      align-items: flex-start;
    }
    
    header {
      padding: 40px 0;
    }
    
    h1 {
      font-size: 1.8rem;
    }
    
    .hero-image {
      height: 200px;
    }
    
    article {
      padding: 20px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }