.calculadora { background: #fff; border-radius: 8px; box-shadow: 0 2px 8px #0001; padding: 24px; margin: 20px 0; max-width: 400px;}
label { display: block; margin-bottom: 8px; font-weight: bold;}
input[type="number"] { width: 100%; padding: 8px; margin-bottom: 12px; border: 1px solid #ccc; border-radius: 4px;}
.resultado { background: #fff19b; border-left: 4px solid #1a7749; padding: 10px 14px; margin-bottom: 12px;}
.nota { font-size: 0.94em; color: #888;}