* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-color: #2563eb;
            --secondary-color: #64748b;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --danger-color: #ef4444;
            --bg-primary: #ffffff;
            --bg-secondary: #f8fafc;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --border-color: #e2e8f0;
            --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            line-height: 1.6;
        }

        .app-container {
            display: flex;
            min-height: 100vh;
        }

        /* Sidebar */
        .sidebar {
            width: 280px;
            background: var(--bg-primary);
            border-right: 1px solid var(--border-color);
            padding: 1.5rem;
            overflow-y: auto;
            transition: transform 0.3s ease;
        }

        .sidebar.collapsed {
            transform: translateX(-100%);
        }

        .logo {
            display: flex;
            align-items: center;
            margin-bottom: 2rem;
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--primary-color);
            cursor: pointer;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--primary-color);
            border-radius: 8px;
            margin-right: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
        }

        .nav-section {
            margin-bottom: 2rem;
        }

        .nav-title {
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--text-secondary);
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 0.75rem;
        }

        .nav-item {
            display: flex;
            align-items: center;
            padding: 0.75rem 1rem;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s;
            margin-bottom: 0.25rem;
            color: var(--text-secondary);
        }

        .nav-item:hover {
            background: var(--bg-secondary);
            color: var(--text-primary);
            transform: translateX(2px);
        }

        .nav-item.active {
            background: var(--primary-color);
            color: white;
        }

        .nav-icon {
            width: 20px;
            height: 20px;
            margin-right: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .header {
            background: var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .header-left {
            display: flex;
            align-items: center;
        }

        .menu-toggle {
            background: none;
            border: none;
            font-size: 1.25rem;
            margin-right: 1rem;
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 4px;
            color: var(--text-secondary);
            transition: all 0.2s;
        }

        .menu-toggle:hover {
            background: var(--bg-secondary);
            transform: scale(1.1);
        }

        /* Language Selector */
        .language-selector {
            position: relative;
            margin-right: 1rem;
        }

        .language-btn {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            background: none;
            border: 1px solid var(--border-color);
            padding: 0.5rem 0.75rem;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.875rem;
            color: var(--text-primary);
            transition: all 0.2s;
        }

        .language-btn:hover {
            background: var(--bg-secondary);
            border-color: var(--primary-color);
            transform: translateY(-1px);
        }

        .language-dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            box-shadow: var(--shadow-lg);
            min-width: 200px;
            z-index: 1000;
            display: none;
            max-height: 300px;
            overflow-y: auto;
        }

        .language-dropdown.show {
            display: block;
            animation: fadeIn 0.2s ease-out;
        }

        .language-option {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.75rem 1rem;
            cursor: pointer;
            transition: background-color 0.2s;
            border-bottom: 1px solid var(--border-color);
        }

        .language-option:hover {
            background: var(--bg-secondary);
        }

        .language-option:last-child {
            border-bottom: none;
        }

        .language-option.selected {
            background: var(--primary-color);
            color: white;
        }

        .language-flag {
            font-size: 1.2rem;
            width: 20px;
            text-align: center;
        }

        .language-info {
            flex: 1;
        }

        .language-name {
            font-weight: 500;
            font-size: 0.875rem;
        }

        .language-native {
            font-size: 0.75rem;
            color: var(--text-secondary);
        }

        .language-option.selected .language-native {
            color: rgba(255, 255, 255, 0.8);
        }

        .breadcrumb {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .user-info {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            background: var(--bg-secondary);
            cursor: pointer;
            transition: all 0.2s;
        }

        .user-info:hover {
            background: var(--border-color);
            transform: translateY(-1px);
        }

        .user-avatar {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary-color);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
        }

        .content-area {
            flex: 1;
            padding: 2rem;
            overflow-y: auto;
        }

        /* Cards */
        .card {
            background: var(--bg-primary);
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-1px);
        }

        .card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-color);
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            border-radius: 8px;
            font-weight: 500;
            text-decoration: none;
            border: none;
            cursor: pointer;
            transition: all 0.2s;
            font-size: 0.875rem;
            position: relative;
            overflow: hidden;
        }

        .btn:hover {
            transform: translateY(-1px);
        }

        .btn:active {
            transform: translateY(0);
        }

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

        .btn-primary:hover {
            background: #1d4ed8;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }

        .btn-secondary {
            background: var(--bg-secondary);
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover {
            background: #e2e8f0;
            border-color: var(--primary-color);
        }

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

        .btn-success:hover {
            background: #059669;
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
        }

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

        .btn-danger:hover {
            background: #dc2626;
            box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
        }

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

        .btn-warning:hover {
            background: #d97706;
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
        }

        .btn-sm {
            padding: 0.5rem 1rem;
            font-size: 0.75rem;
        }

        /* Forms */
        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--text-primary);
            cursor: pointer;
            transition: color 0.2s;
        }

        .form-label:hover {
            color: var(--primary-color);
        }

        .form-input {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 0.875rem;
            transition: all 0.2s;
            font-family: inherit;
            resize: vertical;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
            transform: translateY(-1px);
        }

        textarea.form-input {
            min-height: 80px;
            resize: vertical;
        }

        .form-select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            background: var(--bg-primary);
            font-size: 0.875rem;
            transition: all 0.2s;
        }

        .form-select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        /* Tables */
        .table {
            width: 100%;
            border-collapse: collapse;
        }

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

        .table th {
            font-weight: 600;
            color: var(--text-secondary);
            background: var(--bg-secondary);
            cursor: pointer;
            user-select: none;
            transition: all 0.2s;
        }

        .table th:hover {
            background: var(--border-color);
            color: var(--text-primary);
        }

        .table tbody tr {
            cursor: pointer;
            transition: all 0.2s;
        }

        .table tbody tr:hover {
            background: var(--bg-secondary);
            transform: scale(1.01);
        }

        /* Dashboard Grid */
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin-bottom: 2rem;
        }

        .stat-card {
            background: var(--bg-primary);
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-color);
        }

        .stat-value {
            font-size: 2rem;
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }

        .stat-label {
            color: var(--text-secondary);
            font-size: 0.875rem;
        }

        /* Login Styles */
        .login-container {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
            padding: 2rem;
        }

        .login-card {
            background: var(--bg-primary);
            border-radius: 16px;
            box-shadow: var(--shadow-lg);
            padding: 3rem;
            width: 100%;
            max-width: 450px;
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .login-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }

        .login-header {
            text-align: center;
            margin-bottom: 2rem;
        }

        .login-header .logo {
            justify-content: center;
            margin-bottom: 1.5rem;
            font-size: 1.75rem;
        }

        .login-header h2 {
            margin-bottom: 0.5rem;
            color: var(--text-primary);
            font-size: 1.5rem;
            font-weight: 600;
        }

        .login-header p {
            color: var(--text-secondary);
            font-size: 0.875rem;
        }

        .login-form {
            margin-bottom: 2rem;
        }

        .btn-full-width {
            width: 100%;
            margin-bottom: 1.5rem;
        }

        .login-divider {
            text-align: center;
            margin: 1.5rem 0;
            position: relative;
            color: var(--text-secondary);
            font-size: 0.875rem;
        }

        .login-divider::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 1px;
            background: var(--border-color);
            z-index: 1;
        }

        .login-divider span {
            background: var(--bg-primary);
            padding: 0 1rem;
            position: relative;
            z-index: 2;
        }

        .social-login {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }

        .btn-social {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            background: var(--bg-primary);
            color: var(--text-primary);
            font-size: 0.875rem;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-social:hover {
            background: var(--bg-secondary);
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }

        .checkbox-label {
            display: flex;
            align-items: center;
            cursor: pointer;
            font-size: 0.875rem;
            color: var(--text-primary);
            transition: color 0.2s;
        }

        .checkbox-label:hover {
            color: var(--primary-color);
        }

        .checkbox-label input[type="checkbox"] {
            margin-right: 0.5rem;
        }

        .form-help {
            display: block;
            margin-top: 0.25rem;
            font-size: 0.75rem;
            color: var(--text-secondary);
            cursor: help;
        }

        .quick-login {
            background: #e0f2fe;
            border: 1px solid #b3e5fc;
            border-radius: 8px;
            padding: 1rem;
            margin-bottom: 1rem;
            text-align: center;
        }

        .quick-login h4 {
            margin-bottom: 0.75rem;
            color: var(--primary-color);
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .quick-login button {
            transition: all 0.2s ease;
        }

        .quick-login button:hover {
            background: var(--primary-color) !important;
            color: white !important;
            transform: translateY(-1px);
            box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
        }

        .quick-login button:active {
            transform: translateY(0);
        }

        .demo-credentials {
            background: var(--bg-secondary);
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
        }

        .demo-credentials h4 {
            margin-bottom: 1rem;
            color: var(--text-primary);
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .demo-account {
            margin-bottom: 1rem;
            padding: 1rem;
            background: var(--bg-primary);
            border-radius: 6px;
            font-size: 0.75rem;
            line-height: 1.4;
            cursor: pointer;
            transition: all 0.2s;
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .demo-account:hover {
            transform: scale(1.02);
            box-shadow: var(--shadow);
            border-color: var(--primary-color);
            background: #f0f9ff;
        }

        .demo-account:hover::before {
            content: '👆 Click to fill credentials';
            position: absolute;
            top: 0;
            right: 0;
            background: var(--primary-color);
            color: white;
            padding: 0.25rem 0.5rem;
            font-size: 0.625rem;
            border-bottom-left-radius: 6px;
        }

        .demo-account:last-child {
            margin-bottom: 0;
        }

        .demo-account strong {
            color: var(--primary-color);
        }

        /* Modal */
        .modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 2000;
            backdrop-filter: blur(4px);
        }

        .modal-content {
            background: var(--bg-primary);
            border-radius: 12px;
            padding: 2rem;
            max-width: 500px;
            width: 90%;
            max-height: 80vh;
            overflow-y: auto;
            box-shadow: var(--shadow-lg);
            transform: scale(0.9);
            animation: modalScale 0.2s ease-out forwards;
        }

        @keyframes modalScale {
            to {
                transform: scale(1);
            }
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-color);
        }

        .close-btn {
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-secondary);
            transition: all 0.2s;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 4px;
        }

        .close-btn:hover {
            background: var(--danger-color);
            color: white;
            transform: scale(1.1);
        }

        .hidden {
            display: none;
        }

        /* User menu dropdown */
        .user-menu {
            position: relative;
        }

        .user-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            box-shadow: var(--shadow-lg);
            min-width: 200px;
            z-index: 1000;
            display: none;
        }

        .user-dropdown.show {
            display: block;
            animation: fadeIn 0.2s ease-out;
        }

        .user-dropdown-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1rem;
            color: var(--text-primary);
            text-decoration: none;
            border-bottom: 1px solid var(--border-color);
            cursor: pointer;
            transition: all 0.2s;
        }

        .user-dropdown-item:hover {
            background: var(--bg-secondary);
            transform: translateX(2px);
        }

        .user-dropdown-item:last-child {
            border-bottom: none;
        }

        .user-role-badge {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            background: var(--primary-color);
            color: white;
            border-radius: 4px;
            font-size: 0.625rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.025em;
            margin-left: 0.5rem;
        }

        .user-role-badge.master-admin {
            background: var(--danger-color);
        }

        .user-role-badge.client-user {
            background: var(--success-color);
        }

        /* Chart placeholder */
        .chart-placeholder {
            height: 300px;
            background: var(--bg-secondary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            cursor: pointer;
            border: 2px dashed var(--border-color);
            transition: all 0.3s ease;
        }

        .chart-placeholder:hover {
            border-color: var(--primary-color);
            background: rgba(37, 99, 235, 0.05);
        }

        /* Sort indicators */
        .sort-asc::after { 
            content: ' ↑'; 
            opacity: 1; 
        }
        
        .sort-desc::after { 
            content: ' ↓'; 
            opacity: 1; 
        }

        /* Button loading state */
        .btn.loading {
            position: relative;
            color: transparent;
        }

        .btn.loading::after {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            border: 2px solid currentColor;
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 1s linear infinite;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: white;
        }

        @keyframes spin {
            to {
                transform: translate(-50%, -50%) rotate(360deg);
            }
        }

        /* Progress bar */
        .progress-bar {
            width: 100%;
            height: 8px;
            background: var(--bg-secondary);
            border-radius: 4px;
            overflow: hidden;
            margin: 1rem 0;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--primary-color), var(--success-color));
            border-radius: 4px;
            transition: width 0.3s ease;
        }

        /* Success/Error messages */
        .alert {
            padding: 1rem;
            border-radius: 8px;
            margin-bottom: 1rem;
            border: 1px solid;
        }

        .alert-success {
            background: #f0fdf4;
            border-color: #bbf7d0;
            color: #166534;
        }

        .alert-error {
            background: #fef2f2;
            border-color: #fecaca;
            color: #dc2626;
        }

        .alert-warning {
            background: #fffbeb;
            border-color: #fed7aa;
            color: #d97706;
        }

        .alert-info {
            background: #f0f9ff;
            border-color: #bae6fd;
            color: #0369a1;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .sidebar {
                position: fixed;
                z-index: 1000;
                height: 100vh;
                transform: translateX(-100%);
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .main-content {
                width: 100%;
            }

            .dashboard-grid {
                grid-template-columns: 1fr;
            }

            .content-area {
                padding: 1rem;
            }

            .header {
                padding: 1rem;
            }
        }

        /* Animation Classes */
        .fade-in {
            animation: fadeIn 0.3s ease-in;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes slideIn {
            from {
                transform: translateX(100%);
                opacity: 0;
            }
            to {
                transform: translateX(0);
                opacity: 1;
            }
        }

        @keyframes slideOut {
            from {
                transform: translateX(0);
                opacity: 1;
            }
            to {
                transform: translateX(100%);
                opacity: 0;
            }
        }

        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.4; }
            100% { opacity: 1; }
        }

        .loading {
            opacity: 0.6;
            pointer-events: none;
        }

        /* Filter controls */
        .filters {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
            align-items: center;
        }

        .filter-group {
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
        }

        .filter-label {
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        /* Data visualization cards */
        .viz-card {
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1.5rem;
            transition: all 0.3s ease;
        }

        .viz-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .viz-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }

        .viz-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .viz-subtitle {
            font-size: 0.875rem;
            color: var(--text-secondary);
        }

        /* File upload */
        .file-upload-area {
            border: 2px dashed var(--border-color);
            border-radius: 8px;
            padding: 3rem 2rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background: var(--bg-secondary);
        }

        .file-upload-area:hover {
            border-color: var(--primary-color);
            background: rgba(37, 99, 235, 0.05);
        }

        .file-upload-area.dragover {
            border-color: var(--primary-color);
            background: rgba(37, 99, 235, 0.1);
        }

        /* Tag system */
        .tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.025em;
        }

        .tag-active {
            background: #dcfce7;
            color: #166534;
        }

        .tag-inactive {
            background: #fef2f2;
            color: #dc2626;
        }

        .tag-processing {
            background: #fef3c7;
            color: #92400e;
        }

        .tag-pending {
            background: #ede9fe;
            color: #7c3aed;
        }