h1{font-size:1.5em;text-align:center;margin-bottom:20px;color:#343a40}label{font-size:0.9em;margin-bottom:5px;display:block}input,select,button{width:100%;padding:10px;margin-bottom:15px;border:1px solid #ddd;border-radius:4px;font-size:1em;box-sizing:border-box}button{background:#28a745;color:#fff;font-weight:bold;cursor:pointer;transition:background 0.3s ease;border:none}button:hover{background:#218838}.result{text-align:center;font-size:1.2em;margin-top:15px;color:#333}