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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            background: rgba(255, 255, 255, 0.95);
            padding: 40px;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 500px;
            backdrop-filter: blur(10px);
        }

        h1 {
            color: #333;
            text-align: center;
            margin-bottom: 30px;
            font-size: 28px;
        }

        .form-group {
            margin-bottom: 25px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 500;
            font-size: 14px;
        }

        input[type="number"] {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s ease;
            background: #fafafa;
        }

        input[type="number"]:focus {
            outline: none;
            border-color: #667eea;
            background: #fff;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        button {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 10px;
        }

        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
        }

        button:active {
            transform: translateY(0);
        }

        #calculateBtn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

        #saveBtn {
            background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
        }

        #saveBtn:hover {
            box-shadow: 0 10px 20px rgba(39, 174, 96, 0.3);
        }

        .result {
            margin-top: 30px;
            padding: 20px;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            border-radius: 10px;
            display: none;
        }

        .result h2 {
            color: #333;
            font-size: 20px;
            margin-bottom: 15px;
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            padding: 10px;
            background: rgba(255, 255, 255, 0.7);
            border-radius: 8px;
        }

        .result-label {
            color: #666;
            font-weight: 500;
        }

        .result-value {
            color: #333;
            font-weight: 700;
        }

        .error {
            color: #e74c3c;
            font-size: 14px;
            margin-top: 10px;
            padding: 10px;
            background: #ffe4e4;
            border-radius: 8px;
            display: none;
        }

        .success {
            color: #27ae60;
            font-size: 14px;
            margin-top: 10px;
            padding: 10px;
            background: #e4ffe4;
            border-radius: 8px;
            display: none;
        }

        .history {
            margin-top: 30px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 10px;
        }

        .history h3 {
            color: #333;
            font-size: 18px;
            margin-bottom: 15px;
        }

        .history-item {
            padding: 10px;
            margin-bottom: 8px;
            background: white;
            border-radius: 8px;
            font-size: 14px;
            color: #666;
        }

        .show-all-btn {
            background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
            margin-top: 20px;
        }

        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.4);
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .modal-content {
            background-color: #fefefe;
            margin: 5% auto;
            padding: 0;
            border-radius: 15px;
            width: 90%;
            max-width: 800px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.2);
            animation: slideIn 0.3s ease;
        }

        @keyframes slideIn {
            from {
                transform: translateY(-50px);
                opacity: 0;
            }
            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        .modal-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 20px;
            border-radius: 15px 15px 0 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .modal-body {
            padding: 20px;
            max-height: 60vh;
            overflow-y: auto;
        }

        .close {
            color: white;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            transition: transform 0.2s;
        }

        .close:hover,
        .close:focus {
            transform: rotate(90deg);
        }

        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
        }

        .data-table th {
            background: #f8f9fa;
            padding: 12px;
            text-align: left;
            font-weight: 600;
            color: #333;
            border-bottom: 2px solid #dee2e6;
        }

        .data-table td {
            padding: 10px 12px;
            border-bottom: 1px solid #e9ecef;
        }

        .data-table tr:hover {
            background-color: #f8f9fa;
        }

        .delete-btn {
            background: #e74c3c;
            color: white;
            border: none;
            padding: 6px 12px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 14px;
            transition: all 0.2s;
        }

        .delete-btn:hover {
            background: #c0392b;
            transform: scale(1.05);
        }

        .confirm-dialog {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
            z-index: 2000;
            text-align: center;
        }

        .confirm-dialog h3 {
            margin-bottom: 20px;
            color: #333;
        }

        .confirm-dialog button {
            margin: 0 10px;
            padding: 10px 20px;
        }

        .confirm-yes {
            background: #e74c3c;
        }

        .confirm-no {
            background: #95a5a6;
        }

        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1999;
        }

        @media (max-width: 480px) {
            .container {
                padding: 30px 20px;
            }
            
            h1 {
                font-size: 24px;
            }
        }