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

body {
    font-family: 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    text-align: center;
    color: #2196F3;
    margin-bottom: 2rem;
}

.calculator {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #666;
    font-size: 1.1rem;
}

input {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1.1rem;
    transition: border-color 0.3s;
}

input:focus {
    outline: none;
    border-color: #2196F3;
}

button {
    width: 100%;
    padding: 1rem;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #1976D2;
}

.result {
    margin-top: 1.5rem;
    padding: 1rem;
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
    color: #2196F3;
    min-height: 3.5rem;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .container {
        margin: 1rem auto;
    }
    
    .calculator {
        padding: 1.5rem;
    }
    
    input, button {
        font-size: 1rem;
    }
} 

.select-group {
    margin-bottom: 1.5rem;
}

select {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1.1rem;
    background-color: white;
    cursor: pointer;
}

select:focus {
    outline: none;
    border-color: #2196F3;
}

input:disabled {
    background-color: #f5f5f5;
    cursor: not-allowed;
}