@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600&family=Roboto:wght@700&display=swap');
  
  :root {
    --primary-dark: #0C1F3B;
    --primary-light: #6C5DD3;
    --secondary: #D9E2E8;
    --accent: #33FF99;
    --accent-alt: #4CAF50;
    --text: #D9E2E8;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    color: var(--text);
    font-family: 'Montserrat', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  /* Header Styles */
  header {
    background: rgba(12, 31, 59, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    box-shadow: var(--shadow);
  }
  
  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo {
    font-family: 'Roboto', sans-serif;
    font-size: 24px;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
  }
  
  .nav-links {
    display: flex;
    gap: 30px;
  }
  
  .nav-links a {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
  }
  
  .nav-links a:hover {
    color: var(--accent);
  }
  
  .nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--accent);
    transition: width 0.3s ease;
  }
  
  .nav-links a:hover::after {
    width: 100%;
  }
  
  /* Hero Section */
  .hero {
    padding: 180px 0 100px;
    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;
    z-index: -1;
  }
  
  .hero h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }
  
  .hero p {
    max-width: 700px;
    margin: 0 auto 40px;
    font-size: 1.2rem;
    opacity: 0.9;
  }
  
  .notice {
    background: rgba(217, 226, 232, 0.1);
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 15px;
    margin: 40px auto;
    max-width: 800px;
    text-align: center;
    font-size: 0.9rem;
  }
  
  /* Article Styles */
  article {
    background: rgba(12, 31, 59, 0.7);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 50px;
    margin: 50px auto;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
  }
  
  article::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(108, 93, 211, 0.1) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
    z-index: -1;
  }
  
  @keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  
  article h2 {
    font-family: 'Roboto', sans-serif;
    font-size: 2.2rem;
    margin-bottom: 30px;
    color: var(--accent);
    position: relative;
  }
  
  article h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }
  
  article h3 {
    font-family: 'Roboto', sans-serif;
    font-size: 1.5rem;
    margin: 40px 0 20px;
    color: var(--secondary);
  }
  
  article p {
    margin-bottom: 25px;
    font-size: 1.1rem;
  }
  
  /* Code Blocks */
  pre {
    background: rgba(0, 0, 0, 0.3);
    border-left: 4px solid var(--accent);
    border-radius: 5px;
    padding: 20px;
    margin: 30px 0;
    overflow: 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-dark);
    padding: 2px 10px;
    font-size: 0.8rem;
    border-bottom-left-radius: 5px;
  }
  
  code {
    font-family: 'Courier New', monospace;
    color: var(--accent);
  }
  
  /* Image Gallery */
  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }
  
  .gallery-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  
  .gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }
  
  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }
  
  .gallery-item:hover img {
    transform: scale(1.1);
  }
  
  .gallery-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(12, 31, 59, 0.7), transparent);
  }
  
  /* Footer */
  footer {
    background: rgba(12, 31, 59, 0.9);
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
  }
  
  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 20px;
  }
  
  .footer-links a {
    color: var(--secondary);
    text-decoration: none;
    transition: color 0.3s ease;
  }
  
  .footer-links a:hover {
    color: var(--accent);
  }
  
  .copyright {
    font-size: 0.9rem;
    opacity: 0.7;
  }
  
  /* Responsive Design */
  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.5rem;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    article {
      padding: 30px;
    }
    
    .image-gallery {
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
  }
  
  @media (max-width: 480px) {
    .hero h1 {
      font-size: 2rem;
    }
    
    .header-container {
      flex-direction: column;
      gap: 15px;
    }
    
    .nav-links {
      flex-wrap: wrap;
      justify-content: center;
    }
    
    article {
      padding: 20px;
    }
  }