@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@700&family=Montserrat:wght@400;500&display=swap');
  
  :root {
    --primary: #1E272E;
    --secondary: #03A9F4;
    --accent: #6C5CE7;
    --highlight: #2ED573;
    --text: #F5F6FA;
    --bg: #0F1721;
    --card-bg: rgba(255, 255, 255, 0.05);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Montserrat', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  header {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    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;
    text-align: center;
    padding: 40px;
    max-width: 800px;
  }
  
  h1, h2, h3 {
    font-family: 'Roboto', sans-serif;
    margin-bottom: 20px;
    font-weight: 700;
  }
  
  h1 {
    font-size: 3rem;
    background: linear-gradient(90deg, var(--secondary), var(--highlight));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }
  
  h2 {
    font-size: 2rem;
    color: var(--secondary);
    position: relative;
    padding-bottom: 10px;
  }
  
  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }
  
  h3 {
    font-size: 1.5rem;
    color: var(--highlight);
  }
  
  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }
  
  .notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    z-index: 1000;
    backdrop-filter: blur(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  }
  
  article {
    padding: 80px 0;
  }
  
  .section {
    margin-bottom: 80px;
    padding: 40px;
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  
  .section:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
  }
  
  .grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }
  
  .card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 25px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 25px rgba(0, 0, 0, 0.2);
    border-color: var(--secondary);
  }
  
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }
  
  .image-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
  }
  
  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }
  
  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  }
  
  .image-card:hover img {
    transform: scale(1.1);
  }
  
  pre {
    background: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    border-left: 4px solid var(--secondary);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
  }
  
  code {
    color: var(--highlight);
    background: transparent;
    padding: 2px 4px;
    border-radius: 4px;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
  }
  
  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  th {
    background: rgba(3, 169, 244, 0.2);
    color: var(--secondary);
    font-weight: 500;
  }
  
  tr:hover {
    background: rgba(255, 255, 255, 0.05);
  }
  
  .nav-links {
    display: flex;
    justify-content: center;
    margin: 40px 0;
    flex-wrap: wrap;
  }
  
  .nav-link {
    margin: 0 15px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    color: var(--text);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
  }
  
  .nav-link:hover {
    background: var(--secondary);
    color: var(--primary);
    transform: translateY(-3px);
  }
  
  @media (max-width: 768px) {
    h1 {
      font-size: 2rem;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    .header-content {
      padding: 20px;
    }
    
    .section {
      padding: 25px;
    }
    
    .grid-container {
      grid-template-columns: 1fr;
    }
  }
  
  /* Animations */
  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-20px);
    }
  }
  
  .floating {
    animation: float 6s ease-in-out infinite;
  }
  
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  
  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }