/**
    作者：so先森
    版权：广州市环屿钻探机械有限公司，请勿转载
    QQ：1040108
*/

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

        body {
            font-family: 'Arial', sans-serif;
            background: #f0f2f5;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .calculator {
            background: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            width: 100%;
            max-width: 500px;
        }

        h1 {
            color: #2c3e50;
            text-align: center;
            margin-bottom: 30px;
            font-size: 24px;
        }

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

        label {
            display: block;
            margin-bottom: 8px;
            color: #34495e;
            font-weight: 500;
        }

        input {
            width: 100%;
            padding: 12px;
            border: 2px solid #bdc3c7;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        input:focus {
            border-color: #3498db;
            outline: none;
        }

        button {
            width: 100%;
            padding: 14px;
            background: #3498db;
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            transition: background 0.3s ease;
        }

        button:hover {
            background: #2980b9;
        }

        .result {
            margin-top: 25px;
            padding: 20px;
            background: #ecf0f1;
            border-radius: 6px;
            text-align: center;
            font-size: 18px;
            display: none;
        }

        .error {
            color: #e74c3c;
            font-size: 14px;
            margin-top: 5px;
            display: none;
        }

        .unit {
            color: #7f8c8d;
            font-size: 14px;
            margin-left: 5px;
        }

        .footer{
            text-align: center;
            color: #999;
            border-top:1px solid #efefef;
            margin:10px auto;
            padding:10px;
        }