:root {
            --primary-color: #1a73e8;
            --sidebar-bg: #ffffff;
            --bg-color: #f8f9fa;
            --text-main: #202124;
            --text-muted: #5f6368;
            --card-bg: #ffffff;
            --border-color: #dadce0;
            --success: #1e8e3e;
            --warning: #f9ab00;
            --danger: #d93025;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Roboto', sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* Sidebar Styles */
        .sidebar {
            width: 250px;
            background-color: var(--sidebar-bg);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            transition: transform 0.3s ease;
            position: fixed;
            height: 100vh;
            z-index: 1000;
        }

        .sidebar-header {
            padding: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid var(--border-color);
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--text-main);
        }

        .sidebar-header img {
            width: 30px;
            height: 30px;
        }

        .nav-links {
            list-style: none;
            padding: 10px 0;
            flex-grow: 1;
        }

        .nav-links li {
            padding: 0;
        }

        .nav-links a {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 12px 20px;
            color: var(--text-muted);
            text-decoration: none;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
        }

        .nav-links a:hover, .nav-links a.active {
            background-color: #e8f0fe;
            color: var(--primary-color);
        }

        /* Main Content */
        .main-content {
            flex-grow: 1;
            margin-left: 250px;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            width: calc(100% - 250px);
            transition: margin-left 0.3s ease;
        }

        /* Topbar */
        .topbar {
            height: 64px;
            background-color: var(--card-bg);
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            position: sticky;
            top: 0;
            z-index: 999;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-muted);
            cursor: pointer;
        }

        .user-profile {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 500;
            color: var(--text-muted);
        }

        .user-profile img {
            width: 32px;
            height: 32px;
            border-radius: 50%;
        }

        /* Dashboard Content */
        .dashboard-container {
            padding: 24px;
            flex-grow: 1;
        }

        .page-title {
            margin-bottom: 24px;
            font-size: 1.5rem;
            font-weight: 400;
        }

        /* KPI Cards */
        .kpi-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin-bottom: 24px;
        }

        .kpi-card {
            background: var(--card-bg);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            box-shadow: 0 1px 2px rgba(0,0,0,0.05);
            display: flex;
            flex-direction: column;
        }

        .kpi-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-muted);
            font-size: 0.9rem;
            font-weight: 500;
            margin-bottom: 10px;
        }

        .kpi-value {
            font-size: 2rem;
            font-weight: 400;
            color: var(--text-main);
        }

        .kpi-trend {
            font-size: 0.85rem;
            margin-top: 8px;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .trend-up { color: var(--success); }
        .trend-down { color: var(--danger); }
        .trend-warn { color: var(--warning); }

        /* Charts Section */
        .charts-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 20px;
            margin-bottom: 24px;
        }

        .chart-card {
            background: var(--card-bg);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            box-shadow: 0 1px 2px rgba(0,0,0,0.05);
        }

        .chart-title {
            font-size: 1.1rem;
            font-weight: 500;
            margin-bottom: 15px;
            color: var(--text-main);
        }

        .chart-container {
            position: relative;
            height: 300px;
            width: 100%;
        }

        /* Device List Table */
        .table-card {
            background: var(--card-bg);
            border-radius: 8px;
            border: 1px solid var(--border-color);
            box-shadow: 0 1px 2px rgba(0,0,0,0.05);
            overflow: hidden;
        }

        .table-header {
            padding: 20px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .table-title {
            font-size: 1.1rem;
            font-weight: 500;
        }

        .table-responsive {
            overflow-x: auto;
        }

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

        th, td {
            padding: 12px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }

        th {
            background-color: #f1f3f4;
            color: var(--text-muted);
            font-weight: 500;
            font-size: 0.85rem;
            text-transform: uppercase;
        }

        td {
            font-size: 0.95rem;
            color: var(--text-main);
        }

        .status-badge {
            padding: 4px 8px;
            border-radius: 12px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .status-active { background-color: #e6f4ea; color: #1e8e3e; }
        .status-deprovisioned { background-color: #fce8e6; color: #d93025; }
        .status-inactive { background-color: #fef7e0; color: #b08d00; }

        /* Responsive Design */
        @media (max-width: 992px) {
            .charts-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.active {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
                width: 100%;
            }
            .menu-toggle {
                display: block;
            }
            .kpi-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 480px) {
            .kpi-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Action Bar */
        .action-bar {
            display: flex;
            gap: 10px;
            background: var(--card-bg);
            padding: 12px 20px;
            border-radius: 8px 8px 0 0;
            border: 1px solid var(--border-color);
            border-bottom: none;
            align-items: center;
            flex-wrap: wrap;
        }

        .search-box {
            display: flex;
            align-items: center;
            background: #f1f3f4;
            border-radius: 8px;
            padding: 8px 15px;
            flex-grow: 1;
            max-width: 400px;
        }

        .search-box input {
            border: none;
            background: transparent;
            outline: none;
            padding-left: 10px;
            width: 100%;
            font-size: 0.95rem;
        }

        .btn {
            padding: 8px 16px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            background: var(--card-bg);
            color: var(--text-main);
            font-weight: 500;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all 0.2s;
            font-size: 0.9rem;
        }

        .btn:hover:not(:disabled) {
            background: var(--hover-bg);
        }

        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .btn-primary {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .btn-primary:hover:not(:disabled) {
            background: #1557b0;
        }

           /* Pagination */
        .pagination {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 20px;
            background: var(--card-bg);
            border-top: 1px solid var(--border-color);
        }

        .page-info {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .page-controls {
            display: flex;
            gap: 10px;
        }

         /* Device Details Layout */
        .details-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 20px;
        }

        .info-card {
            background: var(--card-bg);
            border-radius: 8px;
            border: 1px solid var(--border-color);
            box-shadow: 0 1px 2px rgba(0,0,0,0.05);
            overflow: hidden;
        }

        .info-card-header {
            padding: 15px 20px;
            border-bottom: 1px solid var(--border-color);
            background-color: #fbfbfc;
            font-weight: 500;
            font-size: 1.05rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .info-card-body {
            padding: 0;
        }

        .info-row {
            display: flex;
            padding: 12px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        .info-row:last-child {
            border-bottom: none;
        }

        .info-label {
            width: 35%;
            color: var(--text-muted);
            font-size: 0.9rem;
            font-weight: 500;
        }

        .info-value {
            width: 65%;
            color: var(--text-main);
            font-size: 0.95rem;
            word-break: break-word;
        }

        .editable {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .edit-icon {
            color: var(--primary-color);
            cursor: pointer;
            opacity: 0;
            transition: opacity 0.2s;
        }

        .editable:hover .edit-icon {
            opacity: 1;
        }
        
        .storage-bar {
            width: 100%;
            height: 8px;
            background-color: #f1f3f4;
            border-radius: 4px;
            margin-top: 5px;
            overflow: hidden;
        }
        
        .storage-used {
            height: 100%;
            background-color: var(--primary-color);
            border-radius: 4px;
        }
 .device-title-area {
            display: flex;
            align-items: center;
            gap: 15px;
        }
 .action-group {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
             .page-title {
            font-size: 1.8rem;
            font-weight: 400;
        }

        .status-badge {
            padding: 6px 12px;
            border-radius: 16px;
            font-size: 0.85rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

                .breadcrumb {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .breadcrumb a:hover {
            text-decoration: underline;
        }