body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}

.calculator-container {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 400px;
    margin: 20px auto;
}

@media (max-width: 768px) {
    .calculator-container {
        width: 90%;
        padding: 15px;
        margin: 10px auto;
    }
    
    .input-group input {
        padding: 12px;
        font-size: 16px;
    }
    
    button {
        padding: 14px;
        min-height: 48px;
    }
}

@media (min-width: 769px) {
    .calculator-container {
        width: 400px;
    }
}

.input-group {
    margin: 15px 0;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    color: #333;
}

.input-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #444;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #666;
}

.result-box {
    margin-top: 15px;
    padding: 10px;
    background-color: #f8f8f8;
    border-radius: 4px;
    text-align: center;
}

.explanation-panel {
    margin-top: 15px;
}

.explanation-panel button {
    width: auto;
    padding: 8px 15px;
    background-color: #007bff;
    font-size: 14px;
}

.explanation-panel button:hover {
    background-color: #0056b3;
}

.explanation-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-top: 10px;
    padding: 0 15px;
}

.explanation-content.show {
    max-height: 500px;
    padding: 15px;
}

.explanation-content h3 {
    margin: 0 0 10px 0;
    font-size: 16px;
    color: #333;
}

.explanation-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.explanation-content li {
    margin: 8px 0;
    font-size: 14px;
    line-height: 1.5;
    color: #666;
}