body {
            font-family: 'Segoe UI', Arial, sans-serif;
            background-color: #1a1a2e;
            color: #f0f0f0;
            margin: 0;
            padding: 15px; 
            min-height: 100vh;
            box-sizing: border-box;
            display: flex;
            justify-content: center;
            align-items: flex-start;
        }

        .calculator {
            background-color: #2a2a3e;
            border-radius: 8px; 
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            width: 100%;
            max-width: 600px;
            margin-top: 50px;
        }

        .calculator:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
        }

        .calculator-header {
            background-color: #3a3a4e;
            padding: 10px; 
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 2px solid #4a4a5e;
            border-radius: 8px 8px 0 0;
        }

        .calculator-header h2 {
            margin: 0;
            font-size: 1.1rem; 
            color: #ffd700;
            font-weight: 600;
        }

        .calculator-content {
            padding: 20px; 
        }

        .calculator-icon {
            width: 50px; 
            height: 50px; 
            object-fit: contain;
            filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
            display: block;
            margin: 0 auto 15px auto;
        }

        .input-row {
            display: flex;
            align-items: center;
            margin-bottom: 12px;
            gap: 15px;
        }

        .input-row img {
            width: 40px;
            height: 40px;
            object-fit: contain;
            flex-shrink: 0;
        }

        .input-row .name {
            flex: 1;
            color: #e0e0e0;
            font-size: 0.9rem;
            font-weight: 500;
        }

        .input-row input[type="number"] {
            width: 80px;
            padding: 6px 8px;
            border: 2px solid #4a4a5e;
            border-radius: 6px;
            background-color: #252535;
            color: #ffffff;
            font-size: 0.85rem;
            text-align: center;
            transition: all 0.2s ease;
        }

        .input-row input[type="number"]:focus {
            border-color: #ffd700;
            outline: none;
            box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.2);
        }

        .input-row .result {
            width: 80px;
            text-align: center;
            color: #ffd700;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .total-section {
            margin-top: 20px;
            padding-top: 15px;
            border-top: 2px solid #4a4a5e;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .total-section .total-label {
            color: #ffd700;
            font-size: 1.1rem;
            font-weight: 600;
        }

        .total-section .total-value {
            color: #ffd700;
            font-size: 1.3rem;
            font-weight: bold;
        }

        .reset-button {
            background-color: #6b4f4f;
            color: #ffffff;
            border: none;
            padding: 8px 15px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.85rem;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .reset-button:hover {
            background-color: #8b5f5f;
            transform: translateY(-1px);
        }

        .reset-button:active {
            transform: translateY(0);
        }

        .back-button {
            position: fixed;
            top: 20px;
            left: 20px;
            display: flex;
            align-items: center;
            gap: 5px;
            padding: 8px 16px;
            background-color: #3a3a4e;
            color: #ffd700;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.2s ease;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        }

        .back-button:hover {
            background-color: #4a4a5e;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        }

        .back-icon {
            font-size: 1.2rem;
            line-height: 1;
        }

        @media (max-width: 768px) {
            .calculator {
                margin-top: 20px;
                margin-left: 10px;
                margin-right: 10px;
            }

            .input-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
                margin-bottom: 15px;
            }

            .input-row .name {
                order: 2;
            }

            .input-row img {
                order: 1;
                align-self: center;
            }

            .input-row input,
            .input-row .result {
                order: 3;
                align-self: center;
            }
        }