:root {
    --primary: #0d47a1;
    --secondary: #8e24aa;
    --accent: #ff7e5f;
    --text: #333;
    --light: #f8f9fa;
    --dark: #212529;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  }

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

  body {
    background-color: var(--light);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  .header {
    background: var(--gradient);
    padding: 100px 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') center/cover no-repeat;
    opacity: 0.2;
    z-index: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
  }

  h1 {
    font-size: 3rem;
    color: white;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
  }

  .tagline {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 30px;
  }

  .notice {
    background: rgba(255,255,255,0.2);
    padding: 15px;
    border-radius: 5px;
    margin-top: 30px;
    display: inline-block;
    backdrop-filter: blur(5px);
  }

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255,255,255,0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    transition: all 0.3s ease;
  }

  .navbar.scrolled {
    transform: scale(0.98);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  }

  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .nav-logo {
    font-weight: bold;
    color: var(--primary);
    font-size: 1.2rem;
  }

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

  .nav-link {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
  }

  .nav-link:hover {
    color: var(--accent);
  }

  article {
    padding: 80px 0;
    background: white;
  }

  .article-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
  }

  h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--primary);
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient);
    border-radius: 3px;
  }

  h3 {
    font-size: 1.5rem;
    margin: 40px 0 20px;
    color: var(--secondary);
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }

  strong {
    color: var(--primary);
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 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: auto;
    display: block;
    border-radius: 10px;
  }

  pre {
    background: #f5f5f5;
    padding: 20px;
    border-radius: 5px;
    margin: 30px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    border-left: 4px solid var(--accent);
  }

  code {
    color: var(--secondary);
  }

  .highlight {
    background: linear-gradient(to right, rgba(255,126,95,0.1), rgba(254,180,123,0.1));
    padding: 2px 5px;
    border-radius: 3px;
  }

  .footer {
    background: var(--dark);
    color: white;
    padding: 50px 0;
    text-align: center;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
  }

  .footer-link {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
  }

  .footer-link:hover {
    color: var(--accent);
  }

  .footer-image {
    margin: 30px auto;
    max-width: 200px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2.2rem;
    }
    
    .nav-links {
      display: none;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }