.annuity-calculator-container * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.annuity-calculator-container {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.annuity-calculator-container .calculator-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-bottom: 20px;
}

.annuity-calculator-container .input-group {
    margin-bottom: 20px;
}

.annuity-calculator-container label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

.annuity-calculator-container input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.annuity-calculator-container input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.annuity-calculator-container .error-message {
    color: #e74c3c;
    font-size: 14px;
    margin-top: 5px;
    min-height: 20px;
}

.annuity-calculator-container .button-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    flex-direction: row;
}

.annuity-calculator-container button {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

.annuity-calculator-container button:active {
    transform: translateY(1px);
}

.annuity-calculator-container .calculate-btn {
    background-color: #3498db;
    color: white;
    flex: 2;
}

.annuity-calculator-container .calculate-btn:hover {
    background-color: #2980b9;
}

.annuity-calculator-container .reset-btn {
    background-color: #95a5a6;
    color: white;
    flex: 1;
}

.annuity-calculator-container .reset-btn:hover {
    background-color: #7f8c8d;
}

.annuity-calculator-container .csv-import {
    margin-top: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.annuity-calculator-container .csv-import-btn {
    background-color: #7f8c8d;
    color: white;
    padding: 8px 16px;
    font-size: 14px;
}

.annuity-calculator-container .csv-import-btn:hover {
    background-color: #6c7b7d;
}

.annuity-calculator-container .results-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-top: 20px;
    display: none;
}

.annuity-calculator-container .results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.annuity-calculator-container .result-item {
    display: flex;
    justify-content: space-between;
    padding: 15px 0;
    border-bottom: 1px solid #ecf0f1;
}

.annuity-calculator-container .result-label {
    font-weight: 600;
    color: #2c3e50;
}

.annuity-calculator-container .result-value {
    font-weight: 700;
    color: #27ae60;
    font-size: 18px;
}

.annuity-calculator-container .recommendation {
    margin-top: 25px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

.annuity-calculator-container .recommendation-title {
    font-weight: 600;
    margin-bottom: 10px;
    color: #2c3e50;
}

.annuity-calculator-container .export-btn {
    background-color: #2ecc71;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}

.annuity-calculator-container .export-btn:hover {
    background-color: #27ae60;
}

@media (max-width: 600px) {
    .annuity-calculator-container {
        padding: 10px;
    }
    
    .annuity-calculator-container .calculator-container, 
    .annuity-calculator-container .results-container {
        padding: 20px;
    }
    
    .annuity-calculator-container .button-group {
        flex-direction: column;
    }
    
    .annuity-calculator-container .result-item {
        flex-direction: column;
        gap: 5px;
    }
}