:root {
            /* Aidstack Brand Colors */
            --primary-color: #1A365D;        /* Navy - Primary Brand */
            --primary-light: #2D5F8D;
            --primary-dark: #0F1F3D;
            --accent-color: #FF6B35;         /* Emergency Orange - Accent */
            --secondary-color: #475569;      /* Slate Gray */

            /* Supporting Colors */
            --success-color: #10B981;
            --danger-color: #EF4444;
            --warning-color: #F59E0B;
            --info-color: #3B82F6;

            /* Backgrounds */
            --light-color: #F8FAFC;          /* Off White */
            --bg-light: #F1F5F9;             /* Light Gray */
            --dark-color: #0F172A;           /* Slate Dark */

            /* Text Colors */
            --text-primary: #0F172A;
            --text-secondary: #475569;
            --text-light: #94A3B8;
        }

        /* General Theme - Aidstack Brand */
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            background-color: var(--light-color);
            color: var(--text-primary);
            transition: background-color 0.3s, color 0.3s;
        }

        /* Headings use Space Grotesk per brand guidelines */
        h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 700;
        }
        
        body.dark-mode {
            background-color: #121212;
            color: #e0e0e0;
        }

        .hidden {
            display: none !important;
        }

        .card {
            border-radius: 10px;
            transition: transform 0.3s, box-shadow 0.3s;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            margin-bottom: 20px;
            border: none;
        }

        .card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
        }
        
        body.dark-mode .card {
            background-color: #1e1e1e;
            border: 1px solid #2d2d2d;
            color: #e0e0e0;
        }

        .card-header {
            background-color: rgba(76, 175, 80, 0.1);
            border-bottom: none;
            padding: 15px 20px;
            font-weight: 600;
            border-radius: 10px 10px 0 0 !important;
        }
        
        body.dark-mode .card-header {
            background-color: rgba(76, 175, 80, 0.15);
        }

        .card-body {
            padding: 20px;
        }

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

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

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

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

        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            color: white;
        }
        
        /* Progress Stepper */
        .stepper-wrapper {
            margin-top: 20px;
            margin-bottom: 30px;
            display: flex;
            justify-content: space-between;
            position: relative;
        }
        
        .stepper-wrapper::before {
            content: '';
            position: absolute;
            top: 16px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: #ccc;
            z-index: 0;
        }
        
        body.dark-mode .stepper-wrapper::before {
            background: #444;
        }
        
        .stepper-item {
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            flex: 1;
            z-index: 1;
        }
        
        .step-counter {
            width: 35px;
            height: 35px;
            border-radius: 50%;
            background: #ccc;
            display: flex;
            justify-content: center;
            align-items: center;
            color: white;
            font-weight: bold;
            margin-bottom: 6px;
        }
        
        body.dark-mode .step-counter {
            background: #444;
        }
        
        .step-name {
            font-size: 0.85rem;
            text-align: center;
            color: #666;
        }
        
        body.dark-mode .step-name {
            color: #aaa;
        }
        
        .stepper-item.active .step-counter, 
        .stepper-item.completed .step-counter {
            background-color: var(--primary-color);
        }
        
        .stepper-item.active .step-name, 
        .stepper-item.completed .step-name {
            color: var(--primary-color);
            font-weight: bold;
        }
        
        body.dark-mode .stepper-item.active .step-name, 
        body.dark-mode .stepper-item.completed .step-name {
            color: var(--primary-light);
        }
        
        /* Animations */
        .fade-in {
            animation: fadeIn 0.5s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /* Table Styles */
        .table-container {
            overflow-x: auto;
            overflow-y: auto; 
            max-height: 500px; 
            background-color: #fafafa;
            padding: 10px;
            border-radius: 8px;
            margin-top: 20px;
        }
        
        body.dark-mode .table-container {
            background-color: #1e1e1e;
        }
        
        table {
            width: 100%;
            margin-bottom: 0;
        }
        
        body.dark-mode .table {
            color: #e0e0e0;
        }
        
        body.dark-mode .table thead th {
            border-bottom-color: #2d2d2d;
            background-color: #262626;
        }
        
        body.dark-mode .table td,
        body.dark-mode .table th {
            border-color: #2d2d2d;
        }
        
        /* API Key styles */
        .api-key-input-group {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
        }
        
        /* Column Configuration */
        .column-selection-container {
            background-color: rgba(76, 175, 80, 0.05);
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 15px;
            transition: background-color 0.3s;
        }
        
        body.dark-mode .column-selection-container {
            background-color: rgba(76, 175, 80, 0.1);
        }
        
        .column-selection-container:hover {
            background-color: rgba(76, 175, 80, 0.1);
        }
        
        body.dark-mode .column-selection-container:hover {
            background-color: rgba(76, 175, 80, 0.15);
        }
        
        .additional-columns {
            margin-top: 8px;
            margin-left: 20px;
        }
        
        .additional-column {
            display: flex;
            align-items: center;
            margin-bottom: 8px;
        }
        
        .main-column-selector {
            display: flex;
            align-items: center;
        }
        
        /* Pattern Detection */
        .category-item {
            padding: 6px 12px;
            background-color: rgba(76, 175, 80, 0.2);
            margin: 5px;
            border-radius: 20px;
            display: inline-block;
            font-weight: 500;
        }
        
        body.dark-mode .category-item {
            background-color: rgba(76, 175, 80, 0.3);
        }
        
        /* Help tooltips */
        .help-icon {
            font-size: 1rem;
            color: #6c757d;
            margin-left: 5px;
            cursor: pointer;
        }
        
        .help-icon:hover {
            color: var(--primary-color);
        }
        
        /* Navbar */
        .navbar {
            background-color: var(--primary-color);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        body.dark-mode .navbar {
            background-color: #1a1a1a;
            border-bottom: 1px solid #2d2d2d;
        }
        
        .navbar-brand {
            display: flex;
            align-items: center;
            font-weight: 600;
        }
        
        .navbar-brand img {
            margin-right: 8px;
            height: 30px;
        }

        /* Aidstack brand name styling */
        .navbar-brand {
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 700;
        }

        .navbar-brand .brand-name {
            color: var(--accent-color);  /* Orange */
        }

        body.dark-mode .navbar-brand .brand-name {
            color: var(--accent-color);  /* Orange in dark mode too */
        }
        
        /* Theme toggle */
        .theme-toggle {
            background: none;
            border: none;
            color: white;
            font-size: 1.25rem;
        }
        
        body.dark-mode .theme-toggle {
            color: #e0e0e0;
        }
        
        /* Loading spinner */
        .spinner-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
        }
        
        .spinner-content {
            background: white;
            max-width: min(640px, calc(100% - 32px));
            max-height: calc(100% - 32px);
            overflow-y: auto;
            padding: 30px;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
        }
        
        body.dark-mode .spinner-content {
            background: #1e1e1e;
            color: #e0e0e0;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
        }
        
        /* Prompt templates */
        .prompt-template {
            background-color: #f8f9fa;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
            border-left: 4px solid var(--primary-color);
            cursor: pointer;
            transition: transform 0.15s, box-shadow 0.15s;
        }
        
        body.dark-mode .prompt-template {
            background-color: #2d2d2d;
            border-left: 4px solid var(--primary-light);
        }
        
        .prompt-template:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        
        /* Chart section */
        .chart-container {
            height: 300px;
            margin-top: 20px;
        }

        /* Mock UI Section */
        .mock-ui-container {
            background: linear-gradient(135deg, rgba(76, 175, 80, 0.05) 0%, rgba(33, 150, 243, 0.05) 100%);
            border-radius: 15px;
            padding: 30px;
            margin-top: 40px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
        }

        body.dark-mode .mock-ui-container {
            background: linear-gradient(135deg, rgba(76, 175, 80, 0.1) 0%, rgba(33, 150, 243, 0.1) 100%);
        }

        .mock-spreadsheet {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            margin-bottom: 15px;
        }

        body.dark-mode .mock-spreadsheet {
            background: #2d2d2d;
        }

        .mock-spreadsheet table {
            width: 100%;
            margin: 0;
        }

        .mock-spreadsheet th {
            background: #f5f5f5;
            padding: 12px;
            font-weight: 600;
            border-bottom: 2px solid #e0e0e0;
            font-size: 0.9rem;
        }

        body.dark-mode .mock-spreadsheet th {
            background: #1e1e1e;
            border-bottom-color: #404040;
        }

        .mock-spreadsheet td {
            padding: 10px 12px;
            border-bottom: 1px solid #f0f0f0;
            font-size: 0.85rem;
        }

        body.dark-mode .mock-spreadsheet td {
            border-bottom-color: #404040;
        }

        .mock-ai-result {
            background: rgba(76, 175, 80, 0.1);
            color: #2e7d32;
            font-style: italic;
            padding: 8px 12px;
            border-left: 3px solid #4CAF50;
        }

        body.dark-mode .mock-ai-result {
            background: rgba(76, 175, 80, 0.2);
            color: #81c784;
        }

        .use-case-card {
            border-left: 4px solid var(--primary-color);
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .use-case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
        }

        .persona-badge {
            display: inline-block;
            background: rgba(76, 175, 80, 0.15);
            color: var(--primary-dark);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        body.dark-mode .persona-badge {
            background: rgba(76, 175, 80, 0.25);
            color: var(--primary-light);
        }
        
        /* Mobile optimizations */
        @media (max-width: 768px) {
            .step-name {
                font-size: 0.7rem;
            }
            
            .stepper-wrapper::before {
                left: 15%;
                right: 15%;
            }
            
            .navbar-brand {
                font-size: 1rem;
            }
            
            .container {
                padding-left: 10px;
                padding-right: 10px;
            }
        }

        /* Markdown Content Styling */
        .markdown-content {
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .markdown-content p {
            margin-bottom: 0.5rem;
        }

        .markdown-content ul, .markdown-content ol {
            margin-left: 1.5rem;
            margin-bottom: 0.5rem;
        }

        .markdown-content code {
            background-color: #f5f5f5;
            padding: 2px 6px;
            border-radius: 3px;
            font-size: 0.9em;
        }

        .markdown-content pre {
            background-color: #f5f5f5;
            padding: 10px;
            border-radius: 5px;
            overflow-x: auto;
        }

        .markdown-content pre code {
            background-color: transparent;
            padding: 0;
        }

        .markdown-content strong {
            font-weight: 600;
        }

        .markdown-content em {
            font-style: italic;
        }

        /* Floating Chat Button */
        .floating-chat-button {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            z-index: 1000;
            animation: pulse 2s infinite;
        }

        .floating-chat-button:hover {
            transform: scale(1.1);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
        }

        @keyframes pulse {
            0%, 100% {
                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
            }
            50% {
                box-shadow: 0 4px 20px rgba(var(--accent-orange-rgb), 0.6);
            }
        }

        /* Quick Question Buttons */
        .quick-question-btn {
            font-size: 0.85rem;
            white-space: nowrap;
        }