.calculator-card { background: white; padding: 30px; border-radius: 12px; box-shadow: 0 8px 16px rgba(0,0,0,0.1); width: 100%; max-width: 400px; margin: 0 auto; font-family: sans-serif; }
    .calculator-card h2 { text-align: center; color: #333; margin-top: 0; }
    .form-group { margin-bottom: 15px; text-align: left;}
    .calculator-card label { display: block; margin-bottom: 5px; color: #555; font-weight: bold; }
    .calculator-card input[type="number"] { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 6px; box-sizing: border-box; font-size: 16px; }
    .gender-group { display: flex; gap: 15px; }
    .calculator-card button { width: 100%; padding: 12px; background-color: #4CAF50; color: white; border: none; border-radius: 6px; font-size: 16px; font-weight: bold; cursor: pointer; transition: background 0.3s; margin-top: 10px; }
    .calculator-card button:hover { background-color: #45a049; }
    .result-box { margin-top: 20px; padding: 15px; background: #e8f5e9; border-radius: 6px; display: none; text-align: left;}
    .result-item { margin-bottom: 10px; font-size: 16px; }
    .highlight { font-weight: bold; color: #4CAF50; font-size: 18px; }