.calculator {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            width: 100%;
            max-width: 500px;
        }

        h1 {
            color: #1f2937;
            margin-bottom: 1.5rem;
            font-size: 1.8rem;
            text-align: center;
        }

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

        label {
            display: block;
            color: #4b5563;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }

        input {
            width: 100%;
            padding: 0.8rem;
            border: 2px solid #e5e7eb;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }

        input:focus {
            outline: none;
            border-color: #6366f1;
        }

        .results {
            background: #f8fafc;
            padding: 1.5rem;
            border-radius: 10px;
            margin-top: 1.5rem;
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.8rem;
        }

        .result-item:last-child {
            margin-bottom: 0;
        }

        .result-label {
            color: #64748b;
        }

        .result-value {
            color: #1e40af;
            font-weight: 600;
        }

        .buttons {
            display: flex;
            gap: 1rem;
            margin-top: 1.5rem;
        }

        button {
            flex: 1;
            padding: 1rem;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s ease, opacity 0.2s ease;
        }

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

        .calculate-btn {
            background: #014aac;
            color: white;
        }

        .reset-btn {
            background: #ef4444;
            color: white;
        }

        @media (max-width: 480px) {
            .calculator {
                padding: 1.5rem;
            }
            
            h1 {
                font-size: 1.5rem;
            }
        }