body {
  font-family: 'Inter', Arial, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: #f0f0f0;
}

.card {

  width: 400px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0px 4px 10px rgba(0,0,0,0.1);
  text-align: center;
}

/* RESPONSIVE */
@media (max-width: 400px) {
  .card {
    width: 90%;
    padding: 15px;
  }

 
  input {
    width: 100%;
  }

  .btn-row button {
    width: 100%;
    margin-top: 8px;
    margin-bottom: 0px; 
  }

  #output {
    padding: 50px !important;
    font-size: 16px;
  }
}

/* --- Added/Modified for better spacing on laptop/desktop --- */

.btn-row {
    
    display: flex;
    flex-direction: column; 
    gap: 10px; 
}

.btn-row button {
    width: 100%; 
    margin: 0; 
}

input {
  padding: 10px;
  
  width: 100%; 
  margin-bottom: 15px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
  box-sizing: border-box;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  background: #4C9AFF;
  color: white;
  cursor: pointer;
  font-size: 16px;
  transition: 0.2s;
  
}

button:hover {
  background: #1a73e8;
}

#output {
  margin-top: 15px;
  font-size: 18px;
  font-weight: 600;
  border: 2px solid black;
  
  padding: 100px; 
  box-sizing: border-box;
}