:root {
    --primary: #0D1B2A;
    --secondary: #1E90FF;
    --accent: #FFD700;
    --highlight: #FFA500;
    --text: #333333;
    --light: #F5F5F5;
    --gradient: linear-gradient(135deg, #1E90FF, #4361EE);
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--text);
    background-color: white;
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  header {
    background: var(--primary);
    color: white;
    padding: 20px 0;
    position: relative;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  }

  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--accent);
  }

  nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
  }

  nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
  }

  nav a:hover {
    color: var(--highlight);
  }

  nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--highlight);
    transition: width 0.3s;
  }

  nav a:hover::after {
    width: 100%;
  }

  .hero {
    background: var(--gradient);
    color: white;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero::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: 0.1;
  }

  .hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
  }

  .hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
  }

  .hero p {
    font-size: 20px;
    margin-bottom: 30px;
  }

  .notice {
    background: rgba(255,255,255,0.2);
    padding: 15px;
    border-radius: 8px;
    margin-top: 30px;
    font-size: 14px;
  }

  .section {
    padding: 80px 0;
  }

  .section-title {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
  }

  .section-title h2 {
    font-size: 36px;
    color: var(--primary);
    display: inline-block;
    padding: 0 20px;
    background: white;
    position: relative;
    z-index: 2;
  }

  .section-title::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--secondary);
    z-index: 1;
  }

  .article-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .article-section {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .article-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
  }

  .article-section h3 {
    color: var(--primary);
    font-size: 24px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
  }

  .article-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--highlight);
  }

  .article-section p {
    margin-bottom: 20px;
    font-size: 16px;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .image-card {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
  }

  .image-card:hover {
    transform: scale(1.03);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s;
  }

  .image-card:hover img {
    transform: scale(1.1);
  }

  pre {
    background: #f8f8f8;
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    border-left: 4px solid var(--secondary);
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
  }

  code {
    background: #f0f0f0;
    padding: 2px 5px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
  }

  footer {
    background: var(--primary);
    color: white;
    padding: 40px 0;
    text-align: center;
  }

  .footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  .footer-links {
    display: flex;
    gap: 20px;
  }

  .footer-links a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s;
  }

  .footer-links a:hover {
    color: var(--highlight);
  }

  .copyright {
    font-size: 14px;
    opacity: 0.8;
  }

  @media (max-width: 768px) {
    .hero h1 {
      font-size: 36px;
    }
    
    .hero p {
      font-size: 18px;
    }
    
    nav ul {
      gap: 15px;
    }
    
    .article-section {
      padding: 30px;
    }
  }

  @media (max-width: 480px) {
    .header-content {
      flex-direction: column;
      gap: 15px;
    }
    
    nav ul {
      flex-wrap: wrap;
      justify-content: center;
    }
    
    .hero h1 {
      font-size: 28px;
    }
    
    .section-title h2 {
      font-size: 28px;
    }
  }