/* Mobile-first responsive design */
@media (max-width: 768px) {
    .layout-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .sidebar {
        order: 2;
    }
    
    .main-content {
        order: 1;
    }
    
    .activities-table {
        font-size: 12px;
    }
    
    .activities-table th,
    .activities-table td {
        padding: 8px 10px;
    }
    
    .nav-tabs {
        flex-direction: column;
    }
    
    .container {
        padding: 0 10px;
    }
    
    .card {
        padding: 15px;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 14px;
    }
    
    .btn-large {
        padding: 12px 20px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .activities-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
    
    .stat-item {
        flex-direction: column;
        gap: 5px;
    }
    
    .log-content {
        padding: 5px;
        font-size: 0.8rem;
    }
    
    .log-entry {
        padding: 5px;
    }
    
    .pagination a {
        padding: 6px 10px;
        font-size: 14px;
    }
    
    .form-control {
        padding: 8px;
        font-size: 14px;
    }
}