body {
            font-family: 'Cairo', sans-serif;
            background-color: #f8f9fa;
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            width: 250px;
            background: #3c81c6;
            color: white;
            top: 0;
            bottom: 0;
            right: 0;
            padding: 1rem;
            display: flex;
            flex-direction: column;
        }

        .sidebar a {
            color: white;
            text-decoration: none;
            display: block;
            padding: 10px 15px;
            border-radius: 8px;
            margin-bottom: 8px;
            transition: background 0.3s;
        }

        .sidebar a:hover,
        .sidebar a.active {
            background-color: rgba(255, 255, 255, 0.2);
        }

        .main-content {
            flex: 1;
            padding: 2rem;
        }

        .card {
            border-radius: 12px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .form-label {
            font-weight: 600;
        }

        .table thead th,
        .table tbody td {
            text-align: center;
            vertical-align: middle;
        }

        .balance-positive {
            color: #28a745;
            font-weight: bold;
        }

        .balance-negative {
            color: #dc3545;
            font-weight: bold;
        }