:root {
    --primary: #0D0D0D;
    --secondary: #1A1A1A;
    --accent: #00FF00;
    --highlight: #FFD700;
    --text: #FFFFFF;
    --gradient: linear-gradient(135deg, #1E3C72, #2A5298);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
  }

  body {
    background-color: var(--primary);
    color: var(--text);
    line-height: 1.6;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
  }

  .header {
    text-align: center;
    padding: 2rem;
    background: var(--gradient);
    position: relative;
    margin-bottom: 3rem;
  }

  .header::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: 0.2;
    z-index: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
  }

  h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--highlight);
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
  }

  .tagline {
    font-size: 1.2rem;
    color: var(--accent);
    margin-bottom: 1rem;
  }

  .notice {
    background-color: rgba(0, 255, 0, 0.1);
    border-left: 4px solid var(--accent);
    padding: 1rem;
    margin: 2rem auto;
    max-width: 800px;
    border-radius: 0 4px 4px 0;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
  }

  article {
    background-color: var(--secondary);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }

  h2 {
    font-size: 1.8rem;
    color: var(--highlight);
    margin: 2rem 0 1rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: var(--gradient);
  }

  h3 {
    font-size: 1.5rem;
    color: var(--accent);
    margin: 1.5rem 0 1rem;
  }

  p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
  }

  .image-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 255, 0, 0.2);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px 8px 0 0;
  }

  .image-caption {
    padding: 1rem;
    text-align: center;
    background: rgba(0, 0, 0, 0.3);
  }

  pre {
    background: rgba(0, 0, 0, 0.5);
    border-left: 4px solid var(--accent);
    border-radius: 4px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: "CSS";
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent);
    color: var(--primary);
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    border-radius: 0 0 0 4px;
  }

  code {
    color: var(--accent);
    font-family: 'Courier New', monospace;
  }

  .nav-tabs {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
  }

  .nav-tab {
    padding: 0.8rem 1.5rem;
    margin: 0.5rem;
    background: rgba(0, 255, 0, 0.1);
    border-radius: 30px;
    color: var(--accent);
    text-decoration: none;
    transition: all 0.3s;
    border: 1px solid rgba(0, 255, 0, 0.3);
  }

  .nav-tab:hover {
    background: rgba(0, 255, 0, 0.3);
    transform: translateY(-2px);
  }

  .footer {
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    background: var(--gradient);
    position: relative;
  }

  .footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample12.png') center/cover no-repeat;
    opacity: 0.2;
    z-index: 0;
  }

  .footer-content {
    position: relative;
    z-index: 1;
  }

  @media (max-width: 768px) {
    .header {
      padding: 1.5rem;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    .container {
      padding: 0 1rem;
    }
    
    article {
      padding: 1.5rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 0, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(0, 255, 0, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 0, 0); }
  }

  .pulse {
    animation: pulse 2s infinite;
  }