.main-input-box {
  width:100%; min-height:3rem; border:1px solid #ccc;
  border-radius:4px; padding:0.5rem; font-size:1rem;
}
.solve-button, .step-button, .keyboard-toggle-btn {
  background:#007bff; border:none; border-radius:4px;
  color:#fff; padding:.6rem 1rem; font-size:1rem; cursor:pointer;
}
.solve-button:hover, .step-button:hover, .keyboard-toggle-btn:hover {
  background:#0056b3;
}
.answer-box { margin-top:1rem; font-size:1.2rem; }
.steps-buttons { margin-top:.5rem; }
.steps-container { margin-top:1rem; }
.step { margin-bottom:.75rem; }
.hidden { display:none; }