* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

h1 {
    text-align: center;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 30px;
    font-size: 2.5rem;
    font-weight: 600;
}

.subtitle {
    text-align: center;
    color: #666;
    padding: 20px;
    font-size: 1.1rem;
    border-bottom: 1px solid #eee;
}

.calculator-container {
    padding: 30px;
}

.investment-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.investment-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 25px;
    border-left: 5px solid #667eea;
}

.investment-card:nth-child(2) {
    border-left-color: #764ba2;
}

.investment-card h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.5rem;
    font-weight: 600;
}

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

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.calculation-controls {
    display: flex;
    align-items: end;
    gap: 20px;
    margin-bottom: 40px;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 12px;
}

.calculation-controls .input-group {
    flex: 1;
    margin-bottom: 0;
}

.calculate-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.results-container {
    margin-top: 30px;
}

.chart-container {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.summary-container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}

.summary-card, .comparison-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border-left: 5px solid #667eea;
}

.summary-card:nth-child(2) {
    border-left-color: #764ba2;
}

.comparison-card {
    border-left-color: #28a745;
}

.summary-card h3, .comparison-card h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.2rem;
    font-weight: 600;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 8px 0;
    border-bottom: 1px solid #e9ecef;
}

.summary-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.value {
    font-weight: 600;
    color: #333;
}

.difference.positive {
    color: #28a745;
}

.difference.negative {
    color: #dc3545;
}

@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 10px;
    }
    
    h1 {
        font-size: 2rem;
        padding: 20px;
    }
    
    .calculator-container {
        padding: 20px;
    }
    
    .investment-inputs {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .calculation-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .summary-container {
        grid-template-columns: 1fr;
    }
    
    .investment-card, .summary-card, .comparison-card {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px 0;
    }
    
    .container {
        margin: 5px;
    }
    
    h1 {
        font-size: 1.5rem;
        padding: 15px;
    }
    
    .calculator-container {
        padding: 15px;
    }
    
    .investment-card, .summary-card, .comparison-card {
        padding: 15px;
    }
}