.fitness-calculator {
    max-width: 500px;
    margin: auto;
    padding: 20px;
    background: #f4f4f9;
    border-radius: 8px;
    font-family: Arial, sans-serif;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input, select {
    width: 100%;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 4px;
}

button:hover {
    background-color: #45a049;
}

.hidden { display: none; }

#statusMessage {
    margin-top: 15px;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
}

.results {
    margin-top: 20px;
    padding: 10px;
    background: #e0f7fa;
    border-radius: 5px;
}

.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    padding: 20px;
    border-radius: 5px;
}

#closeModal {
    margin-top: 10px;
    padding: 5px 10px;
}