/* Sidebar Styles */
        .sidebar {
            height: 100vh;
            position: fixed;
            top: 0;
            left: 0;
            width: 250px;
            background-color: #ffffff;
            box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease;
        }

        .sidebar .sidebar-header {
            display: flex;
            justify-content: space-between;
            padding: 20px;
            font-size: 24px;
        }

        /* .sidebar-btn {
            display: none;
        } */
        /* Collapsed Sidebar */
        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-250px);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }

            .sidebar-btn {
                display: block;
            }
        }
        /* Table responsiveness */
        @media (max-width: 600px) {
            .dataTables_wrapper .dataTables_paginate .paginate_button {
                padding: 5px 10px !important;
            }
        }
        /* Body Padding for Main Content */
        .main-content {
            margin-left: 250px;
            transition: margin-left 0.3s ease;
        }
        
        .mycontainer {
            width: 90%;
            margin: 50px auto;
        }
        .stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 30px;
        }
        .stat-card {
            background-color: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            text-align: center;
        }
        .stat-card h2 {
            font-size: 32px;
            color: #333;
            margin-bottom: 10px;
        }
        .stat-card p {
            font-size: 16px;
            color: #777;
        }
        .stat-card .total-sent { color: #4e73df; }
        .stat-card .running-campaign { color: #f39c12; }
        .stat-card .today-sent { color: #2ecc71; }
        .stat-card .pending { color: #e74c3c; }
        
        /* Media Queries for Responsiveness */
        @media screen and (max-width: 768px) {
            .stats {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media screen and (max-width: 480px) {
            .stats {
                grid-template-columns: 1fr;
            }
            .stat-card h2 {
                font-size: 28px;
            }
            .stat-card p {
                font-size: 14px;
            }
        }