.tdee-calculator {
    max-width: 500px;
    margin: 2rem auto;
    padding: 2rem;
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.tdee-calculator .form-group {
    margin-bottom: 1.5rem;
}

.tdee-calculator label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #000000;
}

.tdee-calculator input,
.tdee-calculator select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    font-size: 1rem;
    color: #000000;
    background: #ffffff;
}

.tdee-calculator input:focus,
.tdee-calculator select:focus {
    outline: none;
    border-color: #666666;
}

.tdee-calculator .calculate-btn {
    width: 100%;
    padding: 1rem;
    background: #000000;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.tdee-calculator .calculate-btn:hover {
    background: #333333;
}

.tdee-calculator #result {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e0e0e0;
}

.tdee-calculator .result-hidden {
    display: none;
}

.tdee-calculator #result h3 {
    margin-bottom: 1rem;
    color: #000000;
}

.tdee-calculator #result p {
    margin: 0.5rem 0;
    font-size: 1.1rem;
    color: #000000;
}

.tdee-calculator #result span {
    font-weight: 600;
}

@media (max-width: 600px) {
    .tdee-calculator {
        margin: 1rem;
        padding: 1.5rem;
    }
}