/* Reset básico */
* {
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
  }
  
  .container {
    max-width: 480px;
    background-color: #fff;
    border-radius: 8px;
    padding: 25px 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  }
  
  h1, h2, h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #222;
  }
  
  label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
  }
  
  input[type="number"] {
    width: 100%;
    padding: 8px 10px;
    font-size: 1rem;
    border: 1.5px solid #ccc;
    border-radius: 5px;
    transition: border-color 0.3s ease;
    margin-top: 5px;
  }
  
  input[type="number"]:focus {
    outline: none;
    border-color: #0077ff;
    box-shadow: 0 0 5px #0077ff;
  }
  
  .btn {
    padding: 10px 20px;
    font-weight: 700;
    font-size: 1rem;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin: 5px 5px 10px 0;
    user-select: none;
  }
  
  .btn.primary {
    background-color: #0077ff;
    color: white;
  }
  
  .btn.primary:hover:not(:disabled) {
    background-color: #005fcc;
  }
  
  .btn.secondary {
    background-color: #4a90e2;
    color: white;
  }
  
  .btn.secondary:hover:not(:disabled) {
    background-color: #357abd;
  }
  
  .btn.tertiary {
    background-color: #e0e6f7;
    color: #333;
  }
  
  .btn.tertiary:hover:not(:disabled) {
    background-color: #c6d0f5;
  }
  
  .btn:disabled {
    background-color: #999 !important;
    cursor: not-allowed;
  }
  
  .btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
  }
  
  .wallet-address {
    font-weight: 600;
    margin-bottom: 20px;
  }
  
  .output {
    white-space: pre-line;
    font-weight: 600;
    margin-top: 20px;
    min-height: 40px;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid transparent;
  }