body {
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
}

.utility {
  width: 80%;
  max-width: 50rem; 
  margin: auto 2rem; 
  padding: 3rem;
  border-radius: 10px;
  border: 1px solid green;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  text-align: center;
}

input {
  padding: 0.5rem;
  margin: 1rem 0;
  font-size: 1rem;
}

input {
  flex: 1;  
  width: 70%;

  max-width: 520px;
  padding: .75rem 1rem;
  font-size: 1rem;
  border: 1px solid #c8e6c9;
  border-radius:8px 0  0 8px;
  outline: none;
  transition: border-color .25s ease, box-shadow .25s ease;
}

input:focus {
  border-color: #2e7d32;
  box-shadow: 0 0 0 3px rgba(46,125,50,.15);
}

button {
  padding: 0.65rem 1rem;
  font-size: 1rem;
  border: none;
  background: hsl(123, 46%, 34%);
  color: #fff;
  transition: 0.3s;
}

button {
  background: #1b5e20;
  padding:  .75rem 1rem;
  border: none;
  border-radius:0 8px 8px 0;
  transition: transform .12s ease, background .25s ease;
}
button:hover { transform: translateY(-1px); }
button:active { transform: scale(0.98); }

button.primary { background: #2e7d32; color: #fff; }
button.primary:hover { background: #1b5e20; }



#result  {
  margin-top: 1rem;
  padding: 1rem;
  background: #f7faf7;
  border: 1px solid #e0f2e0;
  border-radius: 10px;
  line-height: 1.6;
  font-size: 1rem;
  word-break: break-word;
}

#result { font-weight: bold; color: #1b5e20; }