:root {
    --primary-color: #0E2C56;
    --secondary-color: #BEC8D1;
    --accent-color: #34C759;
    --highlight-color: #FFA500;
    --text-color: #333333;
    --light-bg: #F5F7FA;
    --card-shadow: 0 10px 20px rgba(14, 44, 86, 0.1);
  }

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

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

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

  .header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 60px;
  }

  .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 center;
    background-size: cover;
    opacity: 0.1;
  }

  .header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
  }

  .header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
  }

  .notice {
    background: rgba(255,255,255,0.2);
    padding: 15px;
    border-radius: 8px;
    margin-top: 30px;
    display: inline-block;
    backdrop-filter: blur(5px);
  }

  .nav {
    display: flex;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    padding: 15px;
    backdrop-filter: blur(5px);
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    padding: 8px 15px;
    border-radius: 20px;
    transition: all 0.3s ease;
    font-weight: 600;
  }

  .nav a:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
  }

  .content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    margin-bottom: 60px;
  }

  article {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
  }

  article::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 150px;
    height: 150px;
    background: url('https://images.gptkong.com/demo/sample2.png') no-repeat center center;
    background-size: contain;
    opacity: 0.1;
    z-index: 0;
  }

  article h2 {
    color: var(--primary-color);
    margin-bottom: 30px;
    font-size: 2rem;
    position: relative;
    z-index: 1;
  }

  article h3 {
    color: var(--primary-color);
    margin: 30px 0 20px;
    font-size: 1.5rem;
    position: relative;
    z-index: 1;
  }

  article p {
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
  }

  pre {
    background: #f8f8f8;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    position: relative;
    z-index: 1;
    border-left: 4px solid var(--accent-color);
  }

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

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
  }

  .gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

  .gallery-item:hover img {
    transform: scale(1.05);
  }

  .footer {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 0;
    text-align: center;
    margin-top: 60px;
  }

  .footer p {
    margin-bottom: 20px;
  }

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

  .footer-links a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    transition: all 0.3s ease;
  }

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

  @media (max-width: 768px) {
    .header h1 {
      font-size: 2rem;
    }
    
    .nav {
      flex-wrap: wrap;
    }
    
    .nav a {
      margin: 5px;
    }
    
    article {
      padding: 30px 20px;
    }
  }

  /* Animations */
  @keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  /* Code block styling */
  pre code.hljs {
    display: block;
    overflow-x: auto;
    padding: 1em;
    background: #f8f8f8;
    border-radius: 4px;
  }

  .hljs {
    color: #333;
  }

  .hljs-keyword,
  .hljs-selector-tag,
  .hljs-title {
    color: #0E2C56;
    font-weight: bold;
  }

  .hljs-string,
  .hljs-meta .hljs-string {
    color: #34C759;
  }

  .hljs-number {
    color: #FFA500;
  }