:root {
            --sidebar-width: 280px;
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --accent-color: #6366f1;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -2px rgb(0 0 0 / 0.05);
        }
        
        [data-bs-theme="dark"] {
            --bs-body-bg: #0f172a;
            --bs-body-color: #e2e8f0;
            --bs-dark: #1e293b;
            --bs-secondary: #334155;
            --border-color: #334155;
            --text-muted: #94a3b8;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -2px rgb(0 0 0 / 0.2);
        }
        
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bs-body-bg);
            color: var(--bs-body-color);
        }
        
        /* Sidebar Styles */
        .sidebar {
            position: fixed;
            top: 0;
            left: -280px;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bs-dark);
            transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1000;
            overflow-y: auto;
            border-right: 1px solid var(--border-color);
        }
        
        .sidebar.show {
            left: 0;
        }
        
        .sidebar-header {
            padding: 1.5rem;
            border-bottom: 1px solid var(--border-color);
            background: var(--primary);
        }
        
        .sidebar-header h4 {
            color: white;
            font-weight: 600;
            margin: 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .sidebar-nav {
            padding: 1rem 0;
        }
        
        .sidebar-nav .nav-link {
            color: var(--text-muted);
            padding: 0.875rem 1.5rem;
            border-radius: 0;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-weight: 500;
            border: none;
            text-decoration: none;
        }
        
        .sidebar-nav .nav-link:hover {
            color: var(--bs-body-color);
            background: rgba(99, 102, 241, 0.1);
            border-left: 3px solid var(--accent-color);
        }
        
        .sidebar-nav .nav-link.active {
            color: var(--accent-color);
            background: rgba(99, 102, 241, 0.15);
            border-left: 3px solid var(--accent-color);
            font-weight: 600;
        }
        
        .sidebar-nav .nav-link i {
            font-size: 1.125rem;
            width: 20px;
            text-align: center;
        }
        
        .sidebar-divider {
            margin: 1rem 1.5rem;
            border-color: var(--border-color);
            opacity: 0.3;
        }
        
        .sidebar-nav .nav-link.logout {
            color: #ef4444;
            margin-top: auto;
        }
        
        .sidebar-nav .nav-link.logout:hover {
            background: rgba(239, 68, 68, 0.1);
            border-left-color: #ef4444;
        }
        
        /* Styles to make sidebar and top-navbar appear dark even in light mode */
        html[data-bs-theme="light"] {
            /* --- Sidebar Overrides --- */
            .sidebar {
                background: #1e293b; /* Dark theme's --bs-dark */
                border-right-color: #334155; /* Dark theme's --border-color */
            }

            .sidebar-nav .nav-link {
                color: #94a3b8; /* Dark theme's --text-muted */
            }

            .sidebar-nav .nav-link:hover {
                color: #e2e8f0; /* Dark theme's --bs-body-color */
                background: rgba(99, 102, 241, 0.1); /* Accent background remains */
            }

            /* .sidebar-nav .nav-link.active und .sidebar-header h4.color sind bereits passend */
            
            .sidebar-divider {
                border-color: #334155; /* Dark theme's --border-color */
            }

            /* --- Top Navbar Overrides --- */
            .top-navbar {
                background: #1e293b !important; /* Dark theme's --bs-dark */
                border-bottom-color: #334155; /* Dark theme's --border-color */
                box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.3); /* Dark theme's --shadow-sm */
            }

            .navbar-brand {
                color: #e2e8f0 !important; /* Dark theme's --bs-body-color */
            }
            
            /* .navbar-toggler-icon filter ist bereits im ursprünglichen Code korrekt für ein weißes Icon */
        }
        /* Main Content */
        .main-content {
            margin-left: 0;
            transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            min-height: 100vh;
            background: var(--bs-body-bg);
        }
        
        /* Top Navbar (Mobile) */
        .top-navbar {
            background: var(--bs-dark) !important;
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        
        .navbar-toggler {
        border: none;
        padding: 0.5rem;
        background-color: var(--bs-dark);
        border-radius: 4px;
        }
        
        .navbar-toggler:focus {
            box-shadow: none;
        }
        
        .navbar-brand {
            font-weight: 600;
            color: var(--bs-body-color) !important;
        }
        
        .navbar-toggler-icon {
        filter: brightness(0) invert(1) !important;
        }


        /* Overlay */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            display: none;
            backdrop-filter: blur(2px);
        }
        
        .overlay.show {
            display: block;
        }
        
        /* Content Area */
        .content-area {
            padding: 2rem;
            max-width: 1400px;
            margin: 0 auto;
        }
        
        /* Cards */
        .card {
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            background: var(--bs-body-bg);
        }
        
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-1px);
        }
        
        .card-header {
            background: rgba(99, 102, 241, 0.05);
            border-bottom: 1px solid var(--border-color);
        }
        
        /* Status Colors */
        .positive { 
            color: #10b981 !important; 
            font-weight: 600; 
        }
        
        .negative { 
            color: #ef4444 !important; 
            font-weight: 600; 
        }
        
        .neutral { 
            color: var(--text-muted) !important; 
            font-weight: 600; 
        }
        
        /* Tables */
        .table {
            --bs-table-bg: transparent;
        }
        
        .table-hover tbody tr:hover {
            background: rgba(99, 102, 241, 0.05);
        }
        
        .table thead th {
            border-bottom: 2px solid var(--border-color);
            font-weight: 600;
            color: var(--text-muted);
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        
        /* Theme Toggle Button */
        .theme-toggle {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--bs-body-color);
            padding: 0.5rem;
            border-radius: 0.5rem;
            transition: all 0.2s ease;
        }
        
        .theme-toggle:hover {
            background: rgba(99, 102, 241, 0.1);
            border-color: var(--accent-color);
        }
        
        /* Responsive Design */
        @media (min-width: 992px) {
            .sidebar {
                left: 0;
            }
            
            .main-content {
                margin-left: var(--sidebar-width);
            }
            
            .top-navbar {
                display: none !important;
            }
        }
        
        @media (max-width: 991.98px) {
            .content-area {
                padding: 1rem;
            }
        }
        
        /* Scrollbar Styling */
        .sidebar::-webkit-scrollbar {
            width: 6px;
        }
        
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        
        .sidebar::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 3px;
        }
        
        .sidebar::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }