/* General Styles */
  body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
    scroll-behavior: smooth;
    transition: background-color 0.3s ease, color 0.3s ease;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
  }

  /* Header */
  header {
    background: #2c3e50;
    color: #fff;
    padding: 1.5rem 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease;
  }

  header h1 {
    margin: 0;
    font-size: 2.5rem;
    font-weight: 700;
  }

  header nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
  }

  header nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: color 0.3s ease, transform 0.3s ease;
  }

  header nav a:hover {
    color: #1abc9c;
    transform: translateY(-3px);
  }

  /* Main Content */
  main {
    padding: 2rem 0;
  }

  section {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 0 auto;
    max-width: 800px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
  }

  section h2 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #1abc9c;
    padding-bottom: 0.5rem;
    transition: color 0.3s ease;
  }

  section h3 {
    font-size: 1.75rem;
    color: #2c3e50;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    transition: color 0.3s ease;
  }

  section h4 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-top: 1.25rem;
    margin-bottom: 0.75rem;
    transition: color 0.3s ease;
  }

  section p {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 1.5rem;
    line-height: 1.8;
    transition: color 0.3s ease;
  }

  /* Lists */
  ul, ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
  }

  li {
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
  }

  /* Code Blocks */
  pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
    transition: background-color 0.3s ease;
  }

  code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1rem;
    color: #1abc9c;
  }

  /* Buttons */
  button {
    background-color: #1abc9c;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
  }

  button:hover {
    background-color: #16a085;
    transform: translateY(-2px);
  }

  /* Links */
  a {
    color: #1abc9c;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease, transform 0.3s ease;
  }

  a:hover {
    color: #16a085;
    transform: translateX(5px);
  }

  /* Footer */
  footer {
    background: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
    transition: background-color 0.3s ease;
  }

  /* Dark Mode Styles */
  body.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
  }

  .dark-mode header {
    background-color: #1f1f1f;
    color: #ffffff;
  }

  .dark-mode section {
    background-color: #1f1f1f;
    color: #e0e0e0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  }

  .dark-mode section h2,
  .dark-mode section h3,
  .dark-mode section h4 {
    color: #ffffff;
    border-bottom-color: #1abc9c;
  }

  .dark-mode section p {
    color: #e0e0e0;
  }

  .dark-mode pre {
    background-color: #2c3e50;
    color: #ffffff;
  }

  .dark-mode code {
    color: #1abc9c;
  }

  .dark-mode a {
    color: #1abc9c;
  }

  .dark-mode a:hover {
    color: #16a085;
  }

  .dark-mode footer {
    background-color: #1f1f1f;
    color: #ffffff;
  }

  .dark-mode ul li {
    color: #e0e0e0;
  }

  /* Dark mode scrollbar */
  .dark-mode ::-webkit-scrollbar {
    width: 8px;
  }

  .dark-mode ::-webkit-scrollbar-track {
    background: #1f1f1f;
  }

  .dark-mode ::-webkit-scrollbar-thumb {
    background: #1abc9c;
    border-radius: 4px;
  }

  .dark-mode ::-webkit-scrollbar-thumb:hover {
    background: #16a085;
  }

  /* Responsive Design */
  @media (max-width: 768px) {
    header h1 {
      font-size: 2rem;
    }

    header nav {
      gap: 1rem;
    }

    section {
      padding: 1.5rem;
    }

    section h2 {
      font-size: 1.75rem;
    }

    section h3 {
      font-size: 1.5rem;
    }

    section h4 {
      font-size: 1.25rem;
    }

    section p {
      font-size: 1rem;
    }

    pre {
      padding: 1rem;
      font-size: 0.9rem;
    }
  }

  @media (max-width: 480px) {
    header h1 {
      font-size: 1.75rem;
    }

    header nav {
      flex-direction: column;
      gap: 0.5rem;
    }

    header nav a {
      font-size: 0.9rem;
    }

    section {
      padding: 1rem;
    }

    section h2 {
      font-size: 1.5rem;
    }

    section h3 {
      font-size: 1.25rem;
    }

    section p {
      font-size: 0.9rem;
    }

    pre {
      padding: 0.75rem;
      font-size: 0.85rem;
    }
  }