:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --success: #27ae60;
            --danger: #e74c3c;
            --warning: #f39c12;
            --info: #17a2b8;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --sidebar-width: 250px;
            --sidebar-collapsed-width: 70px;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f8f9fa;
            overflow-x: hidden;
        }
        
        /* Sidebar Styles */
        #sidebar {
            width: var(--sidebar-width);
            position: fixed;
            top: 0;
            left: 0;
            height: 100vh;
            z-index: 1000;
            background: linear-gradient(180deg, var(--primary) 0%, #1a2530 100%);
            color: white;
            transition: all 0.3s;
            box-shadow: 3px 0 10px rgba(0,0,0,0.1);
        }
        
        #sidebar.collapsed {
            width: var(--sidebar-collapsed-width);
        }
        
        #sidebar .sidebar-header {
            padding: 20px;
            background-color: rgba(0,0,0,0.2);
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        
        #sidebar .sidebar-header h3 {
            margin-bottom: 0;
            font-size: 1.5rem;
            white-space: nowrap;
            overflow: hidden;
        }
        
        #sidebar.collapsed .sidebar-header h3 {
            display: none;
        }
        
        #sidebar ul.components {
            padding: 20px 0;
        }
        
        #sidebar ul li a {
            padding: 12px 20px;
            font-size: 1rem;
            display: block;
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: all 0.3s;
            white-space: nowrap;
            overflow: hidden;
        }
        
        #sidebar ul li a:hover, #sidebar ul li a.active {
            color: white;
            background-color: rgba(255,255,255,0.1);
            border-left: 4px solid var(--secondary);
        }
        
        #sidebar ul li a i {
            margin-right: 10px;
            width: 20px;
            text-align: center;
        }
        
        #sidebar.collapsed ul li a span {
            display: none;
        }
        
        #sidebar.collapsed ul li a i {
            margin-right: 0;
        }
        
        /* Main Content */
        #content {
            width: calc(100% - var(--sidebar-width));
            margin-left: var(--sidebar-width);
            transition: all 0.3s;
            min-height: 100vh;
        }
        
        #content.expanded {
            width: calc(100% - var(--sidebar-collapsed-width));
            margin-left: var(--sidebar-collapsed-width);
        }
        
        /* Top Navigation */
        .navbar-custom {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 15px 20px;
        }
        
        /* Dashboard Cards */
        .dashboard-card {
            border-radius: 10px;
            border: none;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            transition: transform 0.3s, box-shadow 0.3s;
            margin-bottom: 20px;
        }
        
        .dashboard-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        
        .card-icon {
            font-size: 2.5rem;
            opacity: 0.7;
        }
        
        /* System Cards */
        .system-card {
            border-radius: 15px;
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            height: 100%;
            background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
            position: relative;
            overflow: hidden;
        }
        
        .system-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--secondary), var(--primary));
        }
        
        .system-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 25px rgba(0,0,0,0.15);
        }
        
        .system-icon {
            font-size: 3rem;
            margin-bottom: 15px;
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .system-card-link {
            text-decoration: none;
            color: inherit;
            display: block;
            height: 100%;
        }
        
        .system-card-link:hover {
            color: inherit;
        }
        
        .system-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--success);
            color: white;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        
        /* User Info Card */
        .user-info-card {
            background: linear-gradient(135deg, var(--primary) 0%, #3498db 100%);
            color: white;
            border-radius: 15px;
        }
        
        .user-avatar {
            width: 80px;
            height: 80px;
            background: rgba(255,255,255,0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            margin: 0 auto;
            border: 3px solid rgba(255,255,255,0.3);
        }
        
        /* Stats Cards */
        .stats-card {
            border-left: 4px solid;
            border-radius: 8px;
        }
        
        .stats-card.primary {
            border-left-color: var(--secondary);
        }
        
        .stats-card.success {
            border-left-color: var(--success);
        }
        
        .stats-card.warning {
            border-left-color: var(--warning);
        }
        
        .stats-card.info {
            border-left-color: var(--info);
        }
        
        /* Toggle Button */
        #sidebarCollapse {
            background: transparent;
            border: none;
            color: var(--primary);
            font-size: 1.5rem;
        }
        
        /* Welcome Section */
        .welcome-section {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px;
            border-radius: 15px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
        }
        
        .welcome-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" preserveAspectRatio="none"><path d="M0,0 L1000,0 L1000,100 L0,100 Z" fill="rgba(255,255,255,0.1)"></path></svg>');
            background-size: cover;
        }
        
        .welcome-section h1 {
            position: relative;
            z-index: 1;
        }
        
        .welcome-section p {
            position: relative;
            z-index: 1;
            opacity: 0.9;
            margin-bottom: 0;
        }
        
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            #sidebar {
                width: var(--sidebar-collapsed-width);
                text-align: center;
            }
            
            #sidebar .sidebar-header h3 {
                display: none;
            }
            
            #sidebar ul li a span {
                display: none;
            }
            
            #sidebar ul li a i {
                margin-right: 0;
            }
            
            #content {
                width: calc(100% - var(--sidebar-collapsed-width));
                margin-left: var(--sidebar-collapsed-width);
            }
            
            .welcome-section {
                padding: 20px;
                margin: 10px;
                border-radius: 10px;
            }
            
            .system-card {
                margin-bottom: 20px;
            }
        }
        
        /* Animation */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .fade-in-up {
            animation: fadeInUp 0.6s ease-out;
        }

        /* Activities Page Styles */
.user-avatar-sm {
    width: 32px;
    height: 32px;
    font-size: 0.8rem;
    font-weight: bold;
}

.activities-table th {
    border-top: none;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.activities-table td {
    vertical-align: middle;
    font-size: 0.9rem;
}

/* Activity statistics cards */
.stats-card {
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.stats-card:hover {
    transform: translateY(-2px);
}

.stats-card.primary { border-left: 4px solid var(--secondary); }
.stats-card.success { border-left: 4px solid var(--success); }
.stats-card.info { border-left: 4px solid var(--info); }
.stats-card.warning { border-left: 4px solid var(--warning); }