/* Global Styles */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Arial, sans-serif;
        }

        body {
            background-color: #f0f2f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }

        .container {
            max-width: 800px;
            width: 100%;
            padding: 40px;
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        /* Auth Styles */
        .auth-container {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .auth-container h2 {
            margin-bottom: 20px;
        }

        .auth-container input {
            width: 100%;
            padding: 12px;
            margin-bottom: 16px;
            border: 1px solid #ddd;
            border-radius: 4px;
        }

        .auth-container button {
            width: 100%;
            padding: 12px 20px;
            background-color: #007bff;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }

        .auth-container button:hover {
            background-color: #0056b3;
        }

        /* Dashboard Styles */
        .dashboard {
            display: none;
        }

        .dashboard-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .dashboard-header button {
            padding: 8px 16px;
            background-color: #007bff;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
        }

        .dashboard-header button:hover {
            background-color: #0056b3;
        }

        .summary-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .card {
            background-color: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .card h3 {
            margin-bottom: 10px;
        }

        .card h2 {
            font-size: 24px;
        }

        .transactions {
            background-color: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .transactions h3 {
            margin-bottom: 10px;
        }

        .transactions-form {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 20px;
        }

        .transactions-form input,
        .transactions-form select {
            flex: 1;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
        }

        .transactions-form button {
            padding: 12px 20px;
            background-color: #007bff;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }

        .transactions-form button:hover {
            background-color: #0056b3;
        }

        .transactions-table {
            width: 100%;
            border-collapse: collapse;
        }

        .transactions-table th,
        .transactions-table td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }

        .expense {
            color: #dc3545;
        }

        .income {
            color: #28a745;
        }

        /* Loader and Error Styles */
        .loading {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(255, 255, 255, 0.9);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .loading-spinner {
            border: 4px solid #f3f3f3;
            border-top: 4px solid #3498db;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .error-message {
            color: #dc3545;
            padding: 12px;
            background-color: #ffe6e6;
            border-radius: 4px;
            text-align: center;
            margin-bottom: 20px;
            display: none;
        }

        /* Media Queries */
        @media (max-width: 600px) {
            .container {
                padding: 20px;
            }

            .summary-cards {
                grid-template-columns: 1fr;
            }

            .transactions-form {
                flex-direction: column;
            }

            .transactions-form input,
            .transactions-form select,
            .transactions-form button {
                width: 100%;
            }
        }