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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    padding: 20px;
}

.calculator-container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.custom-select {
    position: relative;
}

.dropdown-options {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 0 0 4px 4px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: none;
    z-index: 1000;
}

.dropdown-options.show {
    display: block;
}

.option {
    padding: 10px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.option:hover {
    background-color: #f5f5f5;
}

button {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: #4CAF50;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
    margin: 20px 0;
}

button:hover {
    background-color: #45a049;
}

.output-group {
    margin-top: 20px;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    background-color: #f9f9f9;
}

/* 响应式样式 */
@media (max-width: 768px) {
    .calculator-container {
        padding: 20px;
        margin: 0 10px;
    }
    
    h1 {
        font-size: 20px;
        margin-bottom: 20px;
    }
    
    input[type="number"],
    input[type="text"] {
        padding: 12px;
        font-size: 18px;
    }
    
    button {
        padding: 14px;
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .calculator-container {
        padding: 15px;
    }
    
    h1 {
        font-size: 18px;
    }
}