/*热量计算器*/
       .breadcrumb {
        display: flex;
        gap: 12px;
        margin: 0px 0 0 5.5%;
        font: 14px/1.5 'Microsoft Yahei';
        color: #666;
        list-style: none;
        transform: translateX(-30px);
    }
    
    .breadcrumb a {
        color:#ff8b33;
        text-decoration: none;  
        transition: all 0.3s ease;
    }
    
    .breadcrumb a:hover {
        color: #ff8b33;
        text-decoration: underline;  
        text-underline-offset: 3px;
    }
    
    .breadcrumb li:not(:last-child)::after {
        content: '/';
        margin-left: 12px;
        color: currentColor;
    }
    
    .active {
        color: #2c2928;
        cursor: default;
    }
    
    @keyframes underline {
        from { width: 0 }
        to { width: 100% }
    }
    .breadcrumb {
        width: 100%;
        height: 20px;
        background-color: #f0f8ff;
    }
    .introduction-box{
            font-family: Arial, sans-serif;
            background-color: #f0f8ff;
            padding: 50px;
        }
        .calculator input[type="number"] {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
    margin: 18px 0; /* 添加上下间距 */
}
        .calculator {
            max-width: 400px;
            background-color: #fff;
            padding: 30px;
            margin: auto;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        h2 {
            text-align: center;
            margin-bottom: 20px;
        }
        .form-group {
            margin-bottom: 15px;
            width: 50%;  
            text-align: center;
            margin: 0 auto; 
        }
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }
        select, input[type="number"] {
            width: 100%;
            padding: 8px;
            box-sizing: border-box;
        }
        button {
            width: 36%;  
            padding: 10px;
            background-color: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
            font-size: 16px;
            text-align: center;
            margin: 18px auto 0;  
            display: block;  
        }
        button:hover {
            background-color: #45a049;
        }
        .result {
            margin-top: 20px;
            padding: 10px;
            background-color: #e7f4e9;
            border-left: 5px solid #66bb6a;
            text-align: center;  
        }
        .result {
    transition: opacity 0.3s ease;
         }