:root {
            --primary: #2563EB;
            --primary-light: #3B82F6;
            --primary-dark: #1D4ED8;
            --success: #10B981;
            --warning: #F59E0B;
            --danger: #EF4444;
            --info: #06B6D4;
            --bg-primary: #FFFFFF;
            --bg-secondary: #F8FAFC;
            --bg-tertiary: #EFF6FF;
            --text-primary: #0F172A;
            --text-secondary: #64748B;
            --border: #E2E8F0;
            --shadow: 0 1px 2px 0 rgba(0,0,0,0.05);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.15);
            --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.15);
        }

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

        html, body {
            height: 100%;
            background: var(--bg-secondary);
        }

        body {
            color: var(--text-primary);
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            font-size: 15px;
            line-height: 1.6;
        }

        /* ============================================
           LOGIN PAGE
           ============================================ */
        .login-container {
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            padding: 20px;
        }

        .login-box {
            background: white;
            border-radius: 16px;
            box-shadow: var(--shadow-xl);
            padding: 40px;
            width: 100%;
            max-width: 420px;
        }

        .login-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .login-header h1 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 8px;
            background: linear-gradient(135deg, #2563EB, #1D4ED8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .login-header p {
            color: var(--text-secondary);
            font-size: 14px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-primary);
            font-size: 14px;
        }

        .form-group input {
            width: 100%;
            padding: 12px 16px;
            border: 1.5px solid var(--border);
            border-radius: 8px;
            font-size: 15px;
            font-family: inherit;
            transition: all 0.2s;
        }

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

        .demo-users {
            background: var(--bg-tertiary);
            border-radius: 8px;
            padding: 16px;
            margin-bottom: 20px;
            border-left: 4px solid var(--primary);
        }

        .demo-users p {
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 8px;
            font-weight: 500;
        }

        .demo-user {
            font-size: 12px;
            color: var(--text-primary);
            margin: 4px 0;
            font-family: 'Courier New', monospace;
        }

        .btn-login {
            width: 100%;
            padding: 12px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: var(--shadow-md);
        }

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

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

        /* ============================================
           APP LAYOUT
           ============================================ */
        .app-wrapper {
            display: flex;
            height: 100vh;
        }

        .sidebar {
            width: 260px;
            background: white;
            border-right: 1px solid var(--border);
            padding: 20px 0;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow);
        }

        .sidebar-header {
            padding: 0 20px;
            margin-bottom: 30px;
        }

        .sidebar-logo {
            font-size: 28px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 4px;
        }

        .sidebar-subtitle {
            font-size: 12px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .user-info {
            padding: 16px 20px;
            background: var(--bg-tertiary);
            margin: 0 12px 20px;
            border-radius: 8px;
            font-size: 13px;
            border-left: 3px solid var(--primary);
        }

        .user-info-row {
            display: flex;
            justify-content: space-between;
            margin-bottom: 4px;
        }

        .user-info-label {
            color: var(--text-secondary);
            font-weight: 500;
        }

        .user-info-value {
            color: var(--text-primary);
            font-weight: 600;
        }

        .nav-menu {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 6px;
            padding: 0 12px;
            list-style: none;
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 8px;
            cursor: pointer;
            color: var(--text-secondary);
            font-weight: 500;
            transition: all 0.2s;
            border-left: 3px solid transparent;
            font-size: 14px;
        }

        .nav-item:hover {
            background: var(--bg-tertiary);
            color: var(--primary);
        }

        .nav-item.active {
            background: var(--bg-tertiary);
            color: var(--primary);
            border-left-color: var(--primary);
            font-weight: 600;
        }

        .nav-item.disabled {
            opacity: 0.4;
            cursor: not-allowed;
            pointer-events: none;
        }

        .nav-icon {
            font-size: 18px;
        }

        .sidebar-footer {
            padding: 12px;
            border-top: 1px solid var(--border);
        }

        .btn-logout {
            width: 100%;
            padding: 10px 16px;
            background: #FEE2E2;
            color: var(--danger);
            border: none;
            border-radius: 8px;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-logout:hover {
            background: #FECACA;
        }

        .main-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .header {
            background: white;
            padding: 20px 30px;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow);
        }

        .header-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .header-subtitle {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        .content-area {
            flex: 1;
            overflow-y: auto;
            padding: 30px;
        }

        .view {
            display: none;
        }

        .view.active {
            display: block;
            animation: fadeIn 0.3s ease-in;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        /* ============================================
           DASHBOARD CARDS
           ============================================ */
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .stat-card {
            background: white;
            border-radius: 12px;
            padding: 24px;
            box-shadow: var(--shadow-md);
            transition: all 0.3s;
            border-top: 4px solid var(--primary);
            position: relative;
            overflow: hidden;
        }

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

        .stat-card.success {
            border-top-color: var(--success);
        }

        .stat-card.warning {
            border-top-color: var(--warning);
        }

        .stat-card.danger {
            border-top-color: var(--danger);
        }

        .stat-card.info {
            border-top-color: var(--info);
        }

        .stat-card::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 100px;
            height: 100px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }

        .stat-value {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-primary);
            font-family: 'Poppins', sans-serif;
        }

        .stat-change {
            font-size: 12px;
            color: var(--success);
            margin-top: 8px;
            font-weight: 600;
        }

        .stat-change.negative {
            color: var(--danger);
        }

        /* ============================================
           CARDS & CONTENT
           ============================================ */
        .card {
            background: white;
            border-radius: 12px;
            padding: 24px;
            box-shadow: var(--shadow-md);
            margin-bottom: 20px;
        }

        .card-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .card-title-icon {
            font-size: 24px;
        }

        /* ============================================
           FORMS
           ============================================ */
        .form-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 16px;
            margin-bottom: 16px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
        }

        .form-group label {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            padding: 10px 12px;
            border: 1.5px solid var(--border);
            border-radius: 8px;
            font-size: 14px;
            font-family: inherit;
            transition: all 0.2s;
        }

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

        /* ============================================
           BUTTONS
           ============================================ */
        .btn {
            padding: 10px 16px;
            border: none;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: white;
            box-shadow: var(--shadow-md);
        }

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

        .btn-secondary {
            background: var(--bg-tertiary);
            color: var(--primary);
            border: 1.5px solid var(--border);
        }

        .btn-secondary:hover {
            background: var(--border);
        }

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

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

        .btn-group {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: 20px;
        }

        /* ============================================
           MODALS
           ============================================ */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .modal.active {
            display: flex;
        }

        .modal-content {
            background: white;
            border-radius: 12px;
            padding: 30px;
            width: 100%;
            max-width: 500px;
            max-height: 90vh;
            overflow-y: auto;
            box-shadow: var(--shadow-xl);
        }

        .modal-header {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--text-primary);
        }

        .modal-close {
            position: absolute;
            top: 16px;
            right: 16px;
            background: var(--bg-tertiary);
            border: none;
            width: 36px;
            height: 36px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 18px;
            color: var(--text-secondary);
        }

        /* ============================================
           TABLE
           ============================================ */
        .table-responsive {
            overflow-x: auto;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }

        thead {
            background: var(--bg-tertiary);
        }

        th {
            padding: 12px;
            text-align: left;
            font-weight: 600;
            color: var(--text-primary);
            border-bottom: 1px solid var(--border);
            text-transform: uppercase;
            font-size: 12px;
            letter-spacing: 0.3px;
        }

        td {
            padding: 12px;
            border-bottom: 1px solid var(--border);
            color: var(--text-secondary);
        }

        tbody tr:hover {
            background: var(--bg-tertiary);
        }

        /* ============================================
           BADGE
           ============================================ */
        .badge {
            display: inline-block;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            white-space: nowrap;
        }

        .badge-success {
            background: #D1FAE5;
            color: #047857;
        }

        .badge-warning {
            background: #FEF3C7;
            color: #B45309;
        }

        .badge-danger {
            background: #FEE2E2;
            color: #B91C1C;
        }

        .badge-info {
            background: #CFFAFE;
            color: #0369A1;
        }

        /* ============================================
           RESPONSIVE
           ============================================ */
        @media (max-width: 1024px) {
            .dashboard-grid {
                grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
                gap: 16px;
            }

            .sidebar {
                width: 220px;
            }
        }

        @media (max-width: 768px) {
            .app-wrapper {
                flex-direction: column;
            }

            .sidebar {
                width: 100%;
                max-height: 120px;
                padding: 12px;
                flex-direction: row;
                align-items: center;
                border-right: none;
                border-bottom: 1px solid var(--border);
            }

            .sidebar-header {
                padding: 0;
                margin: 0;
                min-width: auto;
            }

            .sidebar-logo {
                font-size: 20px;
                margin-bottom: 0;
            }

            .sidebar-subtitle {
                display: none;
            }

            .nav-menu {
                flex-direction: row;
                gap: 4px;
                padding: 0;
                flex: 1;
                margin-left: 20px;
                overflow-x: auto;
            }

            .nav-item {
                flex-shrink: 0;
                padding: 8px 12px;
                font-size: 12px;
            }

            .user-info {
                display: none;
            }

            .sidebar-footer {
                display: none;
            }

            .content-area {
                padding: 16px;
            }

            .header {
                padding: 16px;
            }

            .dashboard-grid {
                grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            }

            .stat-card {
                padding: 16px;
            }

            .stat-value {
                font-size: 24px;
            }

            .card {
                padding: 16px;
            }
        }