:root {
            /* Professional Color Palette */
            --primary-50: #f8fafc;
            --primary-100: #f1f5f9;
            --primary-200: #e2e8f0;
            --primary-300: #cbd5e0;
            --primary-400: #a0aec0;
            --primary-500: #718096;
            --primary-600: #4a5568;
            --primary-700: #2d3748;
            --primary-800: #1a202c;
            --primary-900: #171923;
            
            --blue-50: #eff6ff;
            --blue-100: #dbeafe;
            --blue-200: #bfdbfe;
            --blue-300: #93c5fd;
            --blue-400: #60a5fa;
            --blue-500: #3b82f6;
            --blue-600: #2563eb;
            --blue-700: #1d4ed8;
            --blue-800: #1e40af;
            --blue-900: #1e3a8a;
            
            --green-50: #ecfdf5;
            --green-100: #d1fae5;
            --green-200: #a7f3d0;
            --green-300: #6ee7b7;
            --green-400: #34d399;
            --green-500: #10b981;
            --green-600: #059669;
            --green-700: #047857;
            --green-800: #065f46;
            --green-900: #064e3b;
            
            --red-50: #fef2f2;
            --red-100: #fee2e2;
            --red-200: #fecaca;
            --red-300: #fca5a5;
            --red-400: #f87171;
            --red-500: #ef4444;
            --red-600: #dc2626;
            --red-700: #b91c1c;
            --red-800: #991b1b;
            --red-900: #7f1d1d;
            
            --orange-50: #fff7ed;
            --orange-100: #ffedd5;
            --orange-200: #fed7aa;
            --orange-300: #fdba74;
            --orange-400: #fb923c;
            --orange-500: #f97316;
            --orange-600: #ea580c;
            --orange-700: #c2410c;
            --orange-800: #9a3412;
            --orange-900: #7c2d12;
            
            /* Typography */
            --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
            
            /* Spacing */
            --space-1: 0.25rem;
            --space-2: 0.5rem;
            --space-3: 0.75rem;
            --space-4: 1rem;
            --space-5: 1.25rem;
            --space-6: 1.5rem;
            --space-8: 2rem;
            --space-10: 2.5rem;
            --space-12: 3rem;
            --space-16: 4rem;
            --space-20: 5rem;
            
            /* Border Radius */
            --radius-sm: 0.25rem;
            --radius-md: 0.375rem;
            --radius-lg: 0.5rem;
            --radius-xl: 0.75rem;
            
            /* Shadows */
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            
            /* Transitions */
            --transition: 150ms ease-in-out;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        html, body {
            height: 100%;
        }
        
        body {
            font-family: var(--font-primary);
            background-color: var(--primary-50);
            color: var(--primary-800);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        .app-layout {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        /* Header Styles */
        .header {
            background-color: white;
            border-bottom: 1px solid var(--primary-200);
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 50;
        }
        
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-6);
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 4rem;
        }
        
        .header-brand {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            text-decoration: none;
            color: var(--primary-800);
            font-weight: 700;
            font-size: 1.25rem;
        }
        
        .header-brand:hover {
            color: var(--blue-600);
        }
        
        .brand-icon {
            width: 2rem;
            height: 2rem;
            background-color: var(--blue-600);
            color: white;
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.875rem;
        }
        
        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-1);
        }
        
        .nav-link {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            padding: var(--space-2) var(--space-4);
            color: var(--primary-600);
            text-decoration: none;
            border-radius: var(--radius-md);
            font-weight: 500;
            font-size: 0.875rem;
            transition: all var(--transition);
        }
        
        .nav-link:hover {
            background-color: var(--primary-100);
            color: var(--primary-800);
        }
        
        .nav-link.active {
            background-color: var(--blue-100);
            color: var(--blue-700);
        }
        
        .user-section {
            display: flex;
            align-items: center;
            gap: var(--space-4);
        }
        
        .user-menu {
            position: relative;
        }
        
        .user-toggle {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            padding: var(--space-2) var(--space-3);
            background: none;
            border: 1px solid var(--primary-200);
            border-radius: var(--radius-md);
            color: var(--primary-600);
            font-size: 0.875rem;
            cursor: pointer;
            transition: all var(--transition);
        }
        
        .user-toggle:hover {
            background-color: var(--primary-50);
            border-color: var(--primary-300);
        }
        
        .user-avatar {
            width: 2rem;
            height: 2rem;
            background-color: var(--primary-500);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 0.75rem;
        }
        
        .user-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            margin-top: var(--space-2);
            background: white;
            border: 1px solid var(--primary-200);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            min-width: 200px;
            z-index: 100;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all var(--transition);
        }
        
        .user-menu.active .user-dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        
        .user-dropdown-item {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            padding: var(--space-3) var(--space-4);
            color: var(--primary-700);
            text-decoration: none;
            font-size: 0.875rem;
            border-bottom: 1px solid var(--primary-100);
            transition: all var(--transition);
        }
        
        .user-dropdown-item:last-child {
            border-bottom: none;
        }
        
        .user-dropdown-item:hover {
            background-color: var(--primary-50);
            color: var(--primary-800);
        }
        
        .user-dropdown-item.danger {
            color: var(--red-600);
        }
        
        .user-dropdown-item.danger:hover {
            background-color: var(--red-50);
            color: var(--red-700);
        }
        
        .dropdown-icon {
            width: 1rem;
            height: 1rem;
            opacity: 0.6;
        }
        
        .btn {
            display: inline-flex;
            align-items: center;
            gap: var(--space-2);
            padding: var(--space-2) var(--space-4);
            border: 1px solid transparent;
            border-radius: var(--radius-md);
            font-family: inherit;
            font-size: 0.875rem;
            font-weight: 500;
            text-decoration: none;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
        }
        
        .btn-primary {
            background-color: var(--blue-600);
            color: white;
            border-color: var(--blue-600);
        }
        
        .btn-primary:hover {
            background-color: var(--blue-700);
            border-color: var(--blue-700);
        }
        
        .btn-secondary {
            background-color: white;
            color: var(--primary-700);
            border-color: var(--primary-300);
        }
        
        .btn-secondary:hover {
            background-color: var(--primary-50);
            border-color: var(--primary-400);
        }
        
        .btn-danger {
            background-color: var(--red-600);
            color: white;
            border-color: var(--red-600);
        }
        
        .btn-danger:hover {
            background-color: var(--red-700);
            border-color: var(--red-700);
        }
        
        /* Main Content */
        .main-content {
            flex: 1;
            max-width: 1200px;
            margin: 0 auto;
            padding: var(--space-8) var(--space-6);
            width: 100%;
        }
        
        /* Footer */
        .footer {
            background-color: var(--primary-800);
            color: var(--primary-300);
            padding: var(--space-6) 0;
            margin-top: auto;
        }
        
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-6);
            text-align: center;
            font-size: 0.875rem;
        }
        
        /* Floating Notifications */
        .notification-container {
            position: fixed;
            bottom: 1rem;
            right: 1rem;
            z-index: 1000;
            display: flex;
            flex-direction: column-reverse;
            gap: var(--space-3);
            pointer-events: none;
        }
        
        .notification {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            padding: var(--space-4);
            background: white;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            border: 1px solid;
            min-width: 320px;
            max-width: 480px;
            pointer-events: auto;
            opacity: 0;
            transform: translateX(100%);
            animation: slideInRight 0.3s ease-out forwards;
        }
        
        .notification.notification-hide {
            animation: slideOutRight 0.3s ease-in forwards;
        }
        
        @keyframes slideInRight {
            from {
                opacity: 0;
                transform: translateX(100%);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }
        
        @keyframes slideOutRight {
            from {
                opacity: 1;
                transform: translateX(0);
            }
            to {
                opacity: 0;
                transform: translateX(100%);
            }
        }
        
        .notification-content {
            display: flex;
            align-items: flex-start;
            gap: var(--space-3);
            flex: 1;
        }
        
        .notification-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 1.5rem;
            height: 1.5rem;
            border-radius: 50%;
            font-weight: 600;
            font-size: 0.875rem;
            flex-shrink: 0;
        }
        
        .notification-message {
            font-weight: 500;
            font-size: 0.875rem;
            line-height: 1.5;
            margin-top: 0.125rem;
        }
        
        .notification-close {
            background: none;
            border: none;
            cursor: pointer;
            padding: var(--space-1);
            margin: calc(var(--space-1) * -1);
            border-radius: var(--radius-sm);
            opacity: 0.6;
            transition: all var(--transition);
            flex-shrink: 0;
        }
        
        .notification-close:hover {
            opacity: 1;
            background-color: rgba(0, 0, 0, 0.05);
        }
        
        .notification-close svg {
            width: 1rem;
            height: 1rem;
        }
        
        .notification-success {
            background-color: var(--green-50);
            color: var(--green-800);
            border-color: var(--green-200);
        }
        
        .notification-success .notification-icon {
            background-color: var(--green-500);
            color: white;
        }
        
        .notification-error {
            background-color: var(--red-50);
            color: var(--red-800);
            border-color: var(--red-200);
        }
        
        .notification-error .notification-icon {
            background-color: var(--red-500);
            color: white;
        }
        
        .notification-warning {
            background-color: var(--orange-50);
            color: var(--orange-800);
            border-color: var(--orange-200);
        }
        
        .notification-warning .notification-icon {
            background-color: var(--orange-500);
            color: white;
        }
        
        .notification-info {
            background-color: var(--blue-50);
            color: var(--blue-800);
            border-color: var(--blue-200);
        }
        
        .notification-info .notification-icon {
            background-color: var(--blue-500);
            color: white;
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
            .header-container {
                padding: 0 var(--space-4);
                height: 3.5rem;
            }
            
            .brand-text {
                display: none;
            }
            
            .nav-links {
                gap: 0;
            }
            
            .nav-link {
                padding: var(--space-2);
            }
            
            .nav-link-text {
                display: none;
            }
            
            .user-info span {
                display: none;
            }
            
            .main-content {
                padding: var(--space-6) var(--space-4);
            }
            
            /* Mobile notifications */
            .notification-container {
                bottom: 0.5rem;
                right: 0.5rem;
                left: 0.5rem;
            }
            
            .notification {
                min-width: auto;
                max-width: none;
                width: 100%;
            }
        }
        
        @media (max-width: 480px) {
            .header-container {
                padding: 0 var(--space-3);
                height: 3rem;
            }
            
            .brand-icon {
                width: 1.75rem;
                height: 1.75rem;
            }
            
            .user-avatar {
                width: 1.75rem;
                height: 1.75rem;
            }
            
            .main-content {
                padding: var(--space-4) var(--space-3);
            }
        }
        
        /* Utilities */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        
        {% block extra_css %}{% endblock %}