.protein-calculator {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

.protein-calculator .form-group {
    margin-bottom: 20px;
}

.protein-calculator label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
}

.protein-calculator input[type="number"],
.protein-calculator select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    box-sizing: border-box;
}

.protein-calculator input[type="number"]:focus,
.protein-calculator select:focus {
    outline: none;
    border-color: #2196F3;
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.protein-calculator .unit-toggle {
    display: flex;
    margin-bottom: 10px;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid #e1e1e1;
}

.protein-calculator .unit-btn {
    flex: 1;
    padding: 10px;
    border: none;
    background: #f8f9fa;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.protein-calculator .unit-btn.active {
    background: #2196F3;
    color: white;
}

.protein-calculator .unit-btn:hover:not(.active) {
    background: #e9ecef;
}

.protein-calculator .radio-group {
    display: flex;
    gap: 20px;
}

.protein-calculator .radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.protein-calculator .radio-group input[type="radio"] {
    margin: 0;
}

.protein-calculator .checkbox-group {
    margin-top: 10px;
}

.protein-calculator .checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.protein-calculator .calculate-btn {
    width: 100%;
    padding: 15px;
    background: #2196F3;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.protein-calculator .calculate-btn:hover {
    background: #0b7dda;
}

.protein-calculator .calculate-btn:disabled {
    background: #cccccc;
    cursor: not-allowed;
}

.protein-calculator .results-container {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin-top: 30px;
    border-left: 4px solid #2196F3;
}

.protein-calculator .results-container h3 {
    margin: 0 0 20px 0;
    color: #2c3e50;
    font-size: 24px;
}

.protein-calculator .result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid #e9ecef;
}

.protein-calculator .result-item:last-child {
    border-bottom: none;
}

.protein-calculator .result-label {
    font-weight: 600;
    color: #495057;
}

.protein-calculator .result-value {
    font-weight: 700;
    color: #2196F3;
    font-size: 18px;
}

.protein-calculator .method-info {
    background: #e3f2fd;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
}

.protein-calculator .disclaimer {
    margin-top: 20px;
    padding: 15px;
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    text-align: center;
}

.protein-calculator .disclaimer p {
    margin: 0;
    color: #856404;
}

.protein-calculator .error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    border: 1px solid #f5c6cb;
}

.protein-calculator .loading {
    text-align: center;
    padding: 20px;
    color: #6c757d;
}

@media (max-width: 768px) {
    .protein-calculator {
        padding: 15px;
    }
    
    .protein-calculator .radio-group {
        flex-direction: column;
        gap: 10px;
    }
    
    .protein-calculator .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}