.trinkgeld-rechner {
        max-width: 500px;
        margin: 0 auto;
        padding: 20px;
        border: 1px solid #ddd;
        border-radius: 8px;
        background-color: #f9f9f9;
        font-family: Arial, sans-serif;
    }
    
    .trinkgeld-rechner h3 {
        text-align: center;
        margin-bottom: 20px;
        color: #333;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    .form-group label {
        display: block;
        margin-bottom: 5px;
        font-weight: bold;
    }
    
    .form-group input {
        width: 100%;
        padding: 8px;
        border: 1px solid #ddd;
        border-radius: 4px;
        box-sizing: border-box;
    }
    
    .percentage-buttons {
        display: flex;
        margin-bottom: 10px;
    }
    
    .percentage-buttons button {
        flex: 1;
        margin: 0 5px 5px 0;
        padding: 8px;
        background-color: #f0f0f0;
        border: 1px solid #ddd;
        border-radius: 4px;
        cursor: pointer;
    }
    
    .percentage-buttons button:hover {
        background-color: #e0e0e0;
    }
    
    .percentage-buttons button.active {
        background-color: #504BDC;
        color: white;
        border-color: #504BDC;
    }
    
    #berechnen-button {
        display: block;
        width: 100%;
        padding: 10px;
        background-color: #504BDC;
        color: white;
        border: none;
        border-radius: 4px;
        cursor: pointer;
        font-size: 16px;
        margin-top: 20px;
    }
    
    #berechnen-button:hover {
        background-color: #4540C0;
    }
    
    .ergebnis {
        margin-top: 20px;
        padding: 15px;
        background-color: #fff;
        border: 1px solid #ddd;
        border-radius: 4px;
    }
    
    .ergebnis-zeile {
        display: flex;
        justify-content: space-between;
        margin-bottom: 8px;
        padding-bottom: 8px;
        border-bottom: 1px solid #eee;
    }
    
    .ergebnis-zeile:last-child {
        border-bottom: none;
    }
    
    .ergebnis-zeile.total {
        font-weight: bold;
        font-size: 1.1em;
        border-top: 2px solid #eee;
        padding-top: 8px;
        margin-top: 8px;
    }