body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    background: #f4f4f4;
    color: #333;
  }
  
  header {
    text-align: center;
    padding: 1em;
    background: #4CAF50;
    color: white;
  }
  
  .grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 8px;
    padding: 20px;
    max-width: 800px;
    margin: auto;
  }
  
  .sticker {
    padding: 15px;
    background: white;
    border: 1px solid #ccc;
    text-align: center;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.2s;
  }
  
  .sticker:hover {
    background: #e0ffe0;
  }
  
  .sticker.vendido {
    background: #ffdddd;
    color: gray;
    text-decoration: line-through;
    cursor: not-allowed;
  }
  
  .progress-container {
    max-width: 600px;
    margin: 20px auto;
    padding: 0 20px;
  }
  
  .progress-bar {
    height: 20px;
    background: #ddd;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 5px;
  }
  
  #progress-fill {
    height: 100%;
    background: #4CAF50;
    width: 0%;
    transition: width 0.5s;
  }
  
  .controls {
    text-align: center;
    margin: 10px 0;
  }
  
  .controls button {
    padding: 10px 20px;
    margin: 0 10px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  .controls button:disabled {
    background: #aaa;
    cursor: not-allowed;
  }