body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background-color: #f4f7f9;
            margin: 0;
            padding: 20px;
        }

        .container {
            background-color: #ffffff;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            max-width: 450px;
            width: 100%;
            text-align: center;
            box-sizing: border-box;
        }

        h2 {
            color: #333;
            margin-bottom: 25px;
        }

        .input-group {
            margin-bottom: 20px;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            width: 100%;
        }

        label {
            font-size: 14px;
            color: #555;
            margin-bottom: 8px;
            font-weight: bold;
        }
        
        input[type="number"] {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            box-sizing: border-box;
            transition: border-color 0.3s;
        }
        
        input[type="number"]:focus {
            border-color: #007BFF;
            outline: none;
        }

        button {
            width: 100%;
            padding: 12px;
            background-color: #007BFF;
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s, transform 0.2s;
        }

        button:hover {
            background-color: #0056b3;
            transform: translateY(-2px);
        }

        #result {
            margin-top: 25px;
            font-size: 18px;
            color: #007BFF;
            font-weight: bold;
            word-wrap: break-word; /* Prevents text overflow */
            min-height: 24px; /* Maintain space even when empty */
        }
        
        /* Responsive design for smaller screens */
        @media (max-width: 500px) {
            .container {
                padding: 20px;
            }
        }