body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
    margin: 0;
    padding: 20px;
}

.calculator-container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.calculator-header {
    background-color: #2c3e50;
    color: white;
    padding: 20px;
    text-align: center;
}

.calculator-header h1 {
    margin: 0;
    font-size: 24px;
}

.calculator-header p {
    margin: 8px 0 0;
    opacity: 0.9;
    font-size: 14px;
}

.calculator-form {
    padding: 20px;
}

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

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #2c3e50;
}

.input-group select,
.input-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

.results {
    margin-top: 20px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 4px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 16px;
}

.result-item span:first-child {
    font-weight: 600;
    color: #2c3e50;
}

.result-item span:last-child {
    font-weight: 700;
    color: #3498db;
}

.calculator-info {
    padding: 20px;
    background-color: #f8f9fa;
    border-top: 1px solid #eee;
}

.calculator-info h3 {
    margin-top: 0;
    color: #2c3e50;
}

.formula {
    font-family: monospace;
    background-color: #e8f4fc;
    padding: 8px 12px;
    border-radius: 4px;
    display: inline-block;
    margin: 10px 0;
}

@media (max-width: 480px) {
    .calculator-container {
        border-radius: 0;
    }
    
    body {
        padding: 0;
    }
}