body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: linear-gradient(to right, #ffe9ec, #fff8dc);
    color: #333;
  }
  
  header {
    padding: 30px;
    text-align: center;
    background-color: #ffd6e0;
  }
  
  .lang-switch {
    margin-bottom: 15px;
  }
  
  .lang-switch button {
    margin: 5px;
    padding: 8px 14px;
    background-color: #ffc107;
    color: #333;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
  }
  
  .lang-switch button:hover {
    background-color: #ffda55;
  }
  
  section {
    padding: 40px 20px;
    background-color: #fffef4;
    margin: 20px;
    border-radius: 12px;
    box-shadow: 0 0 10px rgba(0,0,0,0.05);
  }
  
  footer {
    text-align: center;
    padding: 20px;
    background-color: #ffe0e0;
    color: #555;
    font-size: 14px;
  }
  
  #topBtn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #ffc107;
    color: #333;
    border: none;
    border-radius: 50%;
    padding: 12px 16px;
    font-size: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    cursor: pointer;
    display: none;
    z-index: 999;
    transition: background-color 0.3s;
  }
  
  #topBtn:hover {
    background-color: #ffda55;
  }
  body.dark-mode {
    background: linear-gradient(to right, #1a0033, #000000); 
    color: #eee;
  }
  
  body.dark-mode header {
    background-color: #2a003f;
  }
  
  body.dark-mode section {
    background-color: #120020;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.05);
  }
  
  body.dark-mode footer {
    background-color: #1a0033;
    color: #aaa;
  }
  
  body.dark-mode .lang-switch button,
  body.dark-mode #darkModeBtn,
  body.dark-mode #topBtn {
    background-color: #350058;
    color: #eee;
  }
  
  body.dark-mode .lang-switch button:hover,
  body.dark-mode #darkModeBtn:hover,
  body.dark-mode #topBtn:hover {
    background-color: #55008a;
  }
  @media (max-width: 768px) {
    section {
      padding: 20px 10px;
      margin: 10px;
    }
  
    header h1 {
      font-size: 24px;
    }
  
    #topBtn {
      padding: 10px 14px;
      font-size: 16px;
    }
  
    .lang-switch button,
    #darkModeBtn {
      padding: 6px 10px;
      font-size: 14px;
      margin: 4px;
    }
  
    ul {
      padding-left: 20px;
    }
  }
  .copy {
    color: #007bff;
    cursor: pointer;
    text-decoration: underline;
  }
  
  .copy:hover {
    color: #0056b3;
  }