.calculator {
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            width: 100%;
            max-width: 500px;
        }

        h1 {
            color: #1e3c72;
            margin-bottom: 30px;
            text-align: center;
            font-size: 28px;
        }

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

        label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-weight: 500;
        }

        input {
            width: 100%;
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        input:focus {
            outline: none;
            border-color: #1e3c72;
        }

        button {
            width: 100%;
            padding: 15px;
            background: #1e3c72;
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            cursor: pointer;
            transition: transform 0.2s ease, background 0.3s ease;
        }

        button:hover {
            background: #2a5298;
            transform: translateY(-2px);
        }

        .results {
            margin-top: 30px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 8px;
            display: none;
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 15px;
            font-size: 16px;
        }

        .result-item span:first-child {
            color: #666;
        }

        .result-item span:last-child {
            color: #1e3c72;
            font-weight: 600;
        }

        @media (max-width: 480px) {
            .calculator {
                padding: 20px;
            }
            
            h1 {
                font-size: 24px;
            }
        }