.kpi-calculator {
        background: #f9f9f9;
        padding: 25px;
        border-radius: 12px;
        border: 1px solid #eee;
        font-family: sans-serif;
        max-width: 100%;
        margin: auto;
    }
    .kpi-calculator h3 {
        margin-top: 0;
        color: #333;
        font-size: 1.2rem;
    }
    .input-group {
        margin-bottom: 15px;
    }
    .input-group label {
        display: block;
        font-size: 0.9rem;
        margin-bottom: 5px;
        color: #666;
    }
    .input-group input {
        width: 100%;
        padding: 8px;
        border: 1px solid #ccc;
        border-radius: 6px;
        box-sizing: border-box;
    }
    .results {
        margin-top: 20px;
    }
    .result-item {
        display: flex;
        justify-content: space-between;
        margin-bottom: 8px;
        font-size: 1rem;
    }
    .highlight {
        color: #0073aa;
        font-weight: bold;
        font-size: 1.1rem;
        border-top: 1px solid #ddd;
        padding-top: 10px;
    }
    .feedback {
        font-size: 0.85rem;
        margin-top: 15px;
        font-style: italic;
        text-align: center;
    }