body {
        font-family: Arial, sans-serif;
        background: #f6f8fa;
        display: flex;
        justify-content: center;
        padding: 20px;
    }
    .calculator {
        background: white;
        padding: 20px;
        border-radius: 12px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        max-width: 400px;
        width: 100%;
    }
    h2 {
        text-align: center;
        color: #204065;
    }
    label {
        display: block;
        margin-top: 15px;
        font-weight: bold;
    }
    input, select, textarea, button {
        width: 100%;
        padding: 8px;
        margin-top: 5px;
        border: 1px solid #ccc;
        border-radius: 6px;
        font-size: 16px;
    }
    button {
        background: #12b48b;
        color: white;
        border: none;
        cursor: pointer;
        font-weight: bold;
        margin-top: 15px;
    }
    button:hover {
        background: #0e9a76;
    }
    .result {
        margin-top: 15px;
        font-size: 18px;
        font-weight: bold;
        color: #204065;
        text-align: center;
    }