html, body { 
    margin: 0; 
    padding: 0; 
    font-family: Arial, sans-serif; 
  }
  
  h1 { 
    text-align: center; 
    margin-top: 10px; 
    margin-bottom: 5px; 
  }
  
  p { 
    text-align: center; 
    margin: 5px 0 15px; 
  }
  
  .visualization-container {
    display: flex;
    justify-content: space-between;
    max-width: 1600px; /* Increased from 1200px */
    margin: 0 auto;
    height: 88vh;
  }
  
  .code-container {
    background-color: #f0f0f0;
    border-radius: 10px;
    padding: 15px;
    width: 55%; /* Increased from 48% */
    overflow-y: auto;
    height: 87vh;
    font-size: 15px;
  }
  
  pre {
    margin: 0;
    background-color: #f0f0f0;
    width: 100%;
  }
  
  code {
    font-family: Consolas, "Courier New", monospace;
    white-space: pre;
    display: inline-block;
    min-width: 750px; /* Ensure code is wide enough for longest line */
  }
  
  #codeDisplay {
    width: 100%;
  }
  
  .line-number {
    color: #666;
    display: inline-block;
    min-width: 30px;
  }
  
  .code-line {
    display: block;
    width: 100%;
    position: relative;
    box-sizing: border-box;
  }
  
  /* Fix for line highlighting - make sure the entire line is highlighted */
  .code-line.highlighted {
    background-color: #ffeb3b;
    width: 100%;
    display: block;
  }
  
  .tree-container {
    background-color: #f0f0f0;
    border-radius: 10px;
    padding: 15px;
    width: 42%; /* Reduced from 48% to compensate for code container increase */
    height: 80vh;
    position: relative;
    display: flex;
    flex-direction: column;
  }
  
  #nextStep {
    margin: 10px auto;
    padding: 8px 15px;
    font-size: 16px;
    width: fit-content;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    display: block;
  }
  
  #nextStep:hover { 
    background-color: #45a049; 
  }
  
  #nextStep:disabled { 
    background-color: #cccccc; 
    cursor: not-allowed; 
  }
  
  #container { 
    flex-grow: 1; 
    width: 100%; 
  }
  
  .explanation {
    margin-top: 10px;
    font-size: 14px;
    padding: 10px;
    background-color: #e8e8e8;
    border-radius: 5px;
  }
  
  .color-key {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 5px;
    padding: 8px;
    background-color: #e8e8e8;
    border-radius: 5px;
  }
  
  .color-item {
    display: flex;
    align-items: center;
    margin-right: 10px;
    font-size: 13px;
  }
  
  .color-box {
    width: 16px;
    height: 16px;
    border-radius: 3px;
    margin-right: 4px;
    border: 1px solid #888;
  }
  
  .color-arrow {
    position: relative;
    width: 24px;
    height: 3px;
    margin-right: 4px;
  }
  
  .color-arrow:after {
    content: "";
    position: absolute;
    right: -2px;
    top: -4px;
    border-left: 6px solid;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
  }
  
  .dotted-line {
    width: 24px;
    height: 0;
    border-top: 2px dashed #ff5722;
    margin-right: 4px;
  }