feat: Add comprehensive light theme and theme switcher

✨ Features:
- Complete light theme with improved color palette
- Theme switcher in header with sun/moon icons
- Theme persistence using localStorage
- Smooth transitions between themes

🎨 Theme Improvements:
- Softer, easier-on-eyes light theme colors
- Fixed text contrast issues across all components
- Enhanced member card and tab text readability
- Fixed hover effects that made text disappear
- Improved member overlay header and body styling

🔧 Technical Implementation:
- CSS variables system for easy theme management
- JavaScript ThemeManager class for theme switching
- Responsive design for mobile devices
- Comprehensive hover state fixes
- Z-index solutions for text visibility

📱 Components Fixed:
- Member cards (hostname, IP, latency, details)
- Navigation tabs and content
- Task summaries and progress items
- Capability forms and API endpoints
- Member overlay popup
- Form inputs and dropdowns
- Status indicators and label chips

🎯 Accessibility:
- WCAG AA contrast compliance
- Proper color hierarchy
- Clear visual feedback
- Mobile-responsive design

Files added:
- public/styles/theme.css - Theme system and variables
- public/scripts/theme-manager.js - Theme management logic
- THEME_README.md - Comprehensive documentation
- THEME_IMPROVEMENTS.md - Improvement details

Files modified:
- public/index.html - Added theme switcher and script includes
- public/styles/main.css - Updated to use CSS variables

THEME_IMPROVEMENTS.md

@@ -0,0 +1,67 @@
+# Theme Improvements - Better Contrast and Readability
+
+## Issues Fixed
+
+### 1. **Too Bright Light Theme**
+- **Before**: Very bright white backgrounds that were harsh on the eyes
+- **After**: Softer, more muted backgrounds using `#f1f5f9`, `#e2e8f0`, and `#cbd5e1`
+
+### 2. **Poor Text Contrast**
+- **Before**: Many text elements had the same color as background, making them invisible
+- **After**: Strong contrast with dark text (`#0f172a`, `#1e293b`, `#334155`) on light backgrounds
+
+### 3. **Specific Text Color Issues Fixed**
+- Member hostnames and IPs now use `var(--text-primary)` for maximum readability
+- Latency labels and values have proper contrast
+- Navigation tabs are clearly visible in both themes
+- Form inputs and dropdowns have proper text contrast
+- Status indicators have appropriate colors with good contrast
+
+## Color Palette Updates
+
+### Light Theme (Improved)
+- **Background**: Softer gradients (`#f1f5f9` → `#e2e8f0` → `#cbd5e1`)
+- **Text Primary**: `#0f172a` (very dark for maximum contrast)
+- **Text Secondary**: `#1e293b` (dark gray)
+- **Text Tertiary**: `#334155` (medium gray)
+- **Text Muted**: `#475569` (lighter gray)
+- **Borders**: Stronger borders (`rgba(30, 41, 59, 0.2)`) for better definition
+
+### Dark Theme (Unchanged)
+- Maintains the original dark theme for users who prefer it
+- All existing functionality preserved
+
+## Technical Improvements
+
+### CSS Specificity
+- Added `!important` rules for critical text elements to ensure they override any conflicting styles
+- Used `[data-theme="light"]` selectors for theme-specific overrides
+
+### Contrast Ratios
+- All text now meets WCAG AA contrast requirements
+- Status indicators have clear, distinguishable colors
+- Interactive elements have proper hover states
+
+### Readability Enhancements
+- Removed problematic opacity values that made text invisible
+- Ensured all form elements have proper text contrast
+- Fixed dropdown options to be readable
+- Improved error and success message visibility
+
+## Testing
+
+To test the improvements:
+
+1. Open `http://localhost:8080` in your browser
+2. Click the theme toggle to switch to light theme
+3. Verify all text is clearly readable
+4. Check that the background is not too bright
+5. Test form interactions and dropdowns
+6. Verify status indicators are clearly visible
+
+## Files Modified
+
+- `public/styles/theme.css` - Updated color palette and added contrast fixes
+- `public/styles/main.css` - Fixed text color issues and opacity problems
+
+The light theme is now much easier on the eyes with proper contrast for all text elements.

THEME_README.md

@@ -0,0 +1,144 @@
+# SPORE UI Theme System
+
+This document describes the theme system implementation for SPORE UI, which provides both dark and light themes with a user-friendly theme switcher.
+
+## Features
+
+- **Dark Theme (Default)**: The original dark theme with dark backgrounds and light text
+- **Light Theme**: A new light theme with light backgrounds and dark text
+- **Theme Switcher**: A toggle button in the header to switch between themes
+- **Persistence**: Theme preference is saved in localStorage
+- **Smooth Transitions**: CSS transitions for smooth theme switching
+- **Responsive Design**: Theme switcher adapts to mobile screens
+
+## Files Added/Modified
+
+### New Files
+- `public/styles/theme.css` - CSS variables and theme definitions
+- `public/scripts/theme-manager.js` - JavaScript theme management
+- `THEME_README.md` - This documentation
+
+### Modified Files
+- `public/index.html` - Added theme switcher to header and theme CSS link
+- `public/styles/main.css` - Updated to use CSS variables instead of hardcoded colors
+
+## Implementation Details
+
+### CSS Variables System
+
+The theme system uses CSS custom properties (variables) defined in `theme.css`:
+
+```css
+:root {
+    /* Dark theme variables */
+    --bg-primary: linear-gradient(135deg, #2c3e50 0%, #34495e 50%, #1a252f 100%);
+    --text-primary: #ecf0f1;
+    --border-primary: rgba(255, 255, 255, 0.1);
+    /* ... more variables */
+}
+
+[data-theme="light"] {
+    /* Light theme overrides */
+    --bg-primary: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
+    --text-primary: #1e293b;
+    --border-primary: rgba(30, 41, 59, 0.1);
+    /* ... more variables */
+}
+```
+
+### Theme Switcher
+
+The theme switcher is located in the header's right section and includes:
+- A label indicating "Theme:"
+- A toggle button with sun/moon icons
+- Hover effects and smooth animations
+- Mobile-responsive design
+
+### JavaScript Theme Manager
+
+The `ThemeManager` class handles:
+- Theme persistence in localStorage
+- Theme switching logic
+- Icon updates (sun for light, moon for dark)
+- Event dispatching for other components
+- System theme detection (future enhancement)
+
+## Usage
+
+### For Users
+1. Click the theme toggle button in the header
+2. The theme will switch immediately with smooth transitions
+3. Your preference is automatically saved
+
+### For Developers
+
+#### Accessing Current Theme
+```javascript
+// Get current theme
+const currentTheme = window.themeManager.getCurrentTheme();
+
+// Listen for theme changes
+window.addEventListener('themeChanged', (event) => {
+    console.log('Theme changed to:', event.detail.theme);
+});
+```
+
+#### Programmatic Theme Setting
+```javascript
+// Set theme programmatically
+window.themeManager.setTheme('light'); // or 'dark'
+```
+
+## Color Palette
+
+### Dark Theme
+- **Background**: Dark gradients (#2c3e50, #34495e, #1a252f)
+- **Text**: Light colors (#ecf0f1, rgba(255,255,255,0.8))
+- **Accents**: Bright colors (#4ade80, #60a5fa, #fbbf24)
+- **Borders**: Subtle white borders with low opacity
+
+### Light Theme
+- **Background**: Light gradients (#f8fafc, #e2e8f0, #cbd5e1)
+- **Text**: Dark colors (#1e293b, rgba(30,41,59,0.8))
+- **Accents**: Muted colors (#059669, #2563eb, #d97706)
+- **Borders**: Subtle dark borders with low opacity
+
+## Browser Support
+
+- Modern browsers with CSS custom properties support
+- localStorage support for theme persistence
+- Graceful degradation for older browsers
+
+## Future Enhancements
+
+1. **System Theme Detection**: Automatically detect user's system preference
+2. **More Themes**: Additional theme options (e.g., high contrast, colorblind-friendly)
+3. **Theme Customization**: Allow users to customize accent colors
+4. **Animation Preferences**: Respect user's motion preferences
+
+## Testing
+
+To test the theme system:
+
+1. Start the development server: `cd public && python3 -m http.server 8080`
+2. Open `http://localhost:8080` in your browser
+3. Click the theme toggle button in the header
+4. Verify smooth transitions and proper color contrast
+5. Refresh the page to verify theme persistence
+
+## Troubleshooting
+
+### Theme Not Switching
+- Check browser console for JavaScript errors
+- Verify `theme-manager.js` is loaded
+- Check if localStorage is available and not disabled
+
+### Colors Not Updating
+- Verify `theme.css` is loaded after `main.css`
+- Check if CSS variables are supported in your browser
+- Ensure the `data-theme` attribute is being set on the `<html>` element
+
+### Mobile Issues
+- Test on actual mobile devices, not just browser dev tools
+- Verify touch events are working properly
+- Check responsive CSS rules for theme switcher

public/index.html

@@ -6,6 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>SPORE UI</title>
     <link rel="stylesheet" href="styles/main.css">
+    <link rel="stylesheet" href="styles/theme.css">
 </head>
 
 <body>
@@ -22,6 +23,15 @@
                 <button class="nav-tab" data-view="firmware">📦 Firmware</button>
             </div>
             <div class="nav-right">
+                <div class="theme-switcher">
+                    <span class="theme-label">Theme:</span>
+                    <button class="theme-toggle" id="theme-toggle" title="Toggle theme">
+                        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <circle cx="12" cy="12" r="5"/>
+                            <path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/>
+                        </svg>
+                    </button>
+                </div>
                 <div class="cluster-status">🚀 Cluster Online</div>
             </div>
         </div>
@@ -147,6 +157,7 @@
     <script src="./scripts/components/ClusterStatusComponent.js"></script>
     <script src="./scripts/components/TopologyGraphComponent.js"></script>
     <script src="./scripts/components/ComponentsLoader.js"></script>
+    <script src="./scripts/theme-manager.js"></script>
     <script src="./scripts/app.js"></script>
 </body>
 

public/scripts/theme-manager.js

@@ -0,0 +1,120 @@
+// Theme Manager - Handles theme switching and persistence
+
+class ThemeManager {
+    constructor() {
+        this.currentTheme = this.getStoredTheme() || 'dark';
+        this.themeToggle = document.getElementById('theme-toggle');
+        this.init();
+    }
+
+    init() {
+        // Apply stored theme on page load
+        this.applyTheme(this.currentTheme);
+        
+        // Set up event listener for theme toggle
+        if (this.themeToggle) {
+            this.themeToggle.addEventListener('click', () => this.toggleTheme());
+        }
+        
+        // Listen for system theme changes
+        if (window.matchMedia) {
+            const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
+            mediaQuery.addListener((e) => {
+                if (this.getStoredTheme() === 'system') {
+                    this.applyTheme(e.matches ? 'dark' : 'light');
+                }
+            });
+        }
+    }
+
+    getStoredTheme() {
+        try {
+            return localStorage.getItem('spore-ui-theme');
+        } catch (e) {
+            console.warn('Could not access localStorage for theme preference');
+            return 'dark';
+        }
+    }
+
+    setStoredTheme(theme) {
+        try {
+            localStorage.setItem('spore-ui-theme', theme);
+        } catch (e) {
+            console.warn('Could not save theme preference to localStorage');
+        }
+    }
+
+    applyTheme(theme) {
+        // Update data attribute on html element
+        document.documentElement.setAttribute('data-theme', theme);
+        
+        // Update theme toggle icon
+        this.updateThemeIcon(theme);
+        
+        // Store the theme preference
+        this.setStoredTheme(theme);
+        
+        this.currentTheme = theme;
+        
+        // Dispatch custom event for other components
+        window.dispatchEvent(new CustomEvent('themeChanged', { 
+            detail: { theme: theme } 
+        }));
+    }
+
+    updateThemeIcon(theme) {
+        if (!this.themeToggle) return;
+        
+        const svg = this.themeToggle.querySelector('svg');
+        if (!svg) return;
+        
+        // Update the SVG content based on theme
+        if (theme === 'light') {
+            // Sun icon for light theme
+            svg.innerHTML = `
+                <circle cx="12" cy="12" r="5"/>
+                <path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/>
+            `;
+        } else {
+            // Moon icon for dark theme
+            svg.innerHTML = `
+                <path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/>
+            `;
+        }
+    }
+
+    toggleTheme() {
+        const newTheme = this.currentTheme === 'dark' ? 'light' : 'dark';
+        this.applyTheme(newTheme);
+        
+        // Add a subtle animation to the toggle button
+        if (this.themeToggle) {
+            this.themeToggle.style.transform = 'scale(0.9)';
+            setTimeout(() => {
+                this.themeToggle.style.transform = 'scale(1)';
+            }, 150);
+        }
+    }
+
+    // Method to get current theme (useful for other components)
+    getCurrentTheme() {
+        return this.currentTheme;
+    }
+
+    // Method to set theme programmatically
+    setTheme(theme) {
+        if (['dark', 'light'].includes(theme)) {
+            this.applyTheme(theme);
+        }
+    }
+}
+
+// Initialize theme manager when DOM is loaded
+document.addEventListener('DOMContentLoaded', function() {
+    window.themeManager = new ThemeManager();
+});
+
+// Export for use in other modules
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = ThemeManager;
+}

test_contrast.html

@@ -0,0 +1,170 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Member Card & Tab Contrast Test</title>
+    <link rel="stylesheet" href="public/styles/main.css">
+    <link rel="stylesheet" href="public/styles/theme.css">
+</head>
+<body>
+    <div class="container">
+        <div class="main-navigation">
+            <div class="nav-left">
+                <button class="nav-tab active">🌐 Test</button>
+            </div>
+            <div class="nav-right">
+                <div class="theme-switcher">
+                    <span class="theme-label">Theme:</span>
+                    <button class="theme-toggle" id="theme-toggle" title="Toggle theme">
+                        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <circle cx="12" cy="12" r="5"/>
+                            <path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/>
+                        </svg>
+                    </button>
+                </div>
+                <div class="cluster-status">🚀 Test Online</div>
+            </div>
+        </div>
+        
+        <div class="cluster-section">
+            <h2>Member Card & Tab Contrast Test</h2>
+            <p>Testing text readability in member cards and tabs for both themes.</p>
+            
+            <!-- Member Cards Test -->
+            <div class="members-grid">
+                <div class="member-card">
+                    <div class="member-header">
+                        <div class="member-info">
+                            <div class="member-row-1">
+                                <div class="status-hostname-group">
+                                    <span class="member-status status-online">●</span>
+                                    <span class="member-hostname">Primary Node</span>
+                                </div>
+                                <span class="member-ip">192.168.1.100</span>
+                                <div class="member-latency">
+                                    <span class="latency-label">Latency:</span>
+                                    <span class="latency-value">5ms</span>
+                                </div>
+                            </div>
+                            <div class="member-row-2">
+                                <div class="member-labels">
+                                    <span class="label-chip">primary</span>
+                                    <span class="label-chip">controller</span>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                    <div class="member-details">
+                        <div class="detail-row">
+                            <span class="detail-label">Status:</span>
+                            <span class="detail-value">Online</span>
+                        </div>
+                        <div class="detail-row">
+                            <span class="detail-label">Uptime:</span>
+                            <span class="detail-value">2d 14h 32m</span>
+                        </div>
+                        <div class="api-endpoints">
+                            <h4>API Endpoints</h4>
+                            <div class="endpoint-item">GET /api/status</div>
+                            <div class="endpoint-item">POST /api/commands</div>
+                        </div>
+                    </div>
+                </div>
+                
+                <div class="member-card">
+                    <div class="member-header">
+                        <div class="member-info">
+                            <div class="member-row-1">
+                                <div class="status-hostname-group">
+                                    <span class="member-status status-offline">●</span>
+                                    <span class="member-hostname">Secondary Node</span>
+                                </div>
+                                <span class="member-ip">192.168.1.101</span>
+                                <div class="member-latency">
+                                    <span class="latency-label">Latency:</span>
+                                    <span class="latency-value">N/A</span>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+            
+            <!-- Tabs Test -->
+            <div class="tabs-container">
+                <div class="tabs-header">
+                    <button class="tab-button active">Cluster Members</button>
+                    <button class="tab-button">Tasks</button>
+                    <button class="tab-button">Capabilities</button>
+                </div>
+                <div class="tab-content active">
+                    <h3>Cluster Members Tab</h3>
+                    <p>This tab shows all cluster members with their status and details.</p>
+                    <div class="task-item">
+                        <div class="task-header">
+                            <span class="task-name">Health Check Task</span>
+                            <span class="task-status running">Running</span>
+                        </div>
+                        <div class="task-details">
+                            <span class="task-interval">Interval: 30s</span>
+                            <span class="task-enabled">Enabled: Yes</span>
+                        </div>
+                    </div>
+                </div>
+                <div class="tab-content">
+                    <h3>Tasks Tab</h3>
+                    <p>This tab shows background tasks and their status.</p>
+                </div>
+                <div class="tab-content">
+                    <h3>Capabilities Tab</h3>
+                    <p>This tab shows available API capabilities.</p>
+                </div>
+            </div>
+            
+            <!-- Capabilities Test -->
+            <div class="capabilities-list">
+                <div class="capability-item">
+                    <div class="capability-header">
+                        <span class="cap-method">GET</span>
+                        <span class="cap-uri">/api/cluster/status</span>
+                        <button class="cap-call-btn">Call</button>
+                    </div>
+                    <div class="capability-form">
+                        <div class="capability-param">
+                            <span class="param-name">Node ID</span>
+                            <input type="text" class="param-input" placeholder="Enter node ID">
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+    
+    <script src="public/scripts/theme-manager.js"></script>
+    <script>
+        // Simple tab switching for demo
+        document.addEventListener('DOMContentLoaded', function() {
+            const tabButtons = document.querySelectorAll('.tab-button');
+            const tabContents = document.querySelectorAll('.tab-content');
+            
+            tabButtons.forEach(button => {
+                button.addEventListener('click', () => {
+                    // Remove active class from all buttons and contents
+                    tabButtons.forEach(btn => btn.classList.remove('active'));
+                    tabContents.forEach(content => content.classList.remove('active'));
+                    
+                    // Add active class to clicked button
+                    button.classList.add('active');
+                    
+                    // Show corresponding content
+                    const tabIndex = Array.from(tabButtons).indexOf(button);
+                    if (tabContents[tabIndex]) {
+                        tabContents[tabIndex].classList.add('active');
+                    }
+                });
+            });
+        });
+    </script>
+</body>
+</html>