diff --git a/README.md b/README.md
index 7d43ae9..aaa7ede 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # TheChart
-Advanced medication tracking application for monitoring treatment progress and symptom evolution.
+Modern medication tracking application with advanced UI/UX for monitoring treatment progress and symptom evolution.
 
-## Quick Start
+## 🚀 Quick Start
 ```bash
 # Install dependencies
 make install
@@ -14,12 +14,22 @@ make test
 ```
 
 ## 📚 Documentation
-- **[Features Guide](docs/FEATURES.md)** - Complete feature documentation
-- **[Keyboard Shortcuts](docs/KEYBOARD_SHORTCUTS.md)** - Keyboard shortcuts for efficient navigation
-- **[Export System](docs/EXPORT_SYSTEM.md)** - Data export functionality and formats
+- **[Features Guide](docs/FEATURES.md)** - Complete feature documentation with UI/UX improvements
+- **[Keyboard Shortcuts](docs/KEYBOARD_SHORTCUTS.md)** - Comprehensive keyboard shortcuts for efficiency
+- **[Export System](docs/EXPORT_SYSTEM.md)** - Data export functionality (JSON, XML, PDF)
 - **[Development Guide](docs/DEVELOPMENT.md)** - Testing, development, and architecture
-- **[Changelog](docs/CHANGELOG.md)** - Version history and feature evolution
-- **[Quick Reference](#quick-reference)** - Common commands and shortcuts
+- **[Changelog](docs/CHANGELOG.md)** - Version history and recent UI improvements
+- **[Documentation Index](docs/README.md)** - Complete documentation navigation guide
+
+> 💡 **Quick Start**: New users should start with this README, then explore the [Features Guide](docs/FEATURES.md) for detailed functionality. The [Documentation Index](docs/README.md) provides comprehensive navigation.
+
+## ✨ Recent Major Updates (v1.9.5)
+- **🎨 Modern UI/UX**: Professional themes with ttkthemes integration
+- **⌨️ Keyboard Shortcuts**: Comprehensive shortcut system for all operations
+- **💡 Smart Tooltips**: Context-sensitive help throughout the application
+- **🎭 8 Professional Themes**: Arc, Equilux, Adapta, Yaru, Ubuntu, Plastik, Breeze, Elegance
+- **⚙️ Settings System**: Advanced configuration with theme persistence
+- **📊 Enhanced Tables**: Improved selection highlighting and alternating row colors
 
 ## Table of Contents
 - [Prerequisites](#prerequisites)
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index a7b295e..f5c4def 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -5,6 +5,41 @@ All notable changes to TheChart project are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.9.5] - 2025-08-05
+
+### 🎨 Major UI/UX Overhaul
+- **Added**: Professional theme system with ttkthemes integration
+- **Added**: 8 curated themes (Arc, Equilux, Adapta, Yaru, Ubuntu, Plastik, Breeze, Elegance)
+- **Added**: Dynamic theme switching without restart
+- **Added**: Theme persistence between sessions
+- **Added**: Comprehensive settings window with tabbed interface
+- **Added**: Smart tooltip system with context-sensitive help
+- **Improved**: Table selection highlighting and alternating row colors
+- **Improved**: Modern styling for all UI components (buttons, frames, forms)
+- **Improved**: Professional card-style layouts and enhanced spacing
+
+### ⚙️ Settings and Configuration System
+- **Added**: Advanced settings window (accessible via F2)
+- **Added**: Theme selection with live preview
+- **Added**: UI preferences and customization options
+- **Added**: About dialog with detailed application information
+- **Added**: Settings persistence across application restarts
+
+### 💡 Enhanced User Experience
+- **Added**: Intelligent tooltips for all interactive elements
+- **Added**: Specialized help for pathology scales and medicine options
+- **Added**: Non-intrusive tooltip timing (500-800ms delay)
+- **Added**: Quick theme switching via menu bar
+- **Improved**: Visual hierarchy with better typography and spacing
+- **Improved**: Professional color schemes across all themes
+
+### 🏗️ Technical Architecture Improvements
+- **Added**: Modular theme manager with dependency injection
+- **Added**: Tooltip management system
+- **Added**: Enhanced UI manager with theme integration
+- **Improved**: Code organization with separate concerns
+- **Improved**: Error handling with graceful theme fallbacks
+
 ## [1.7.0] - 2025-08-05
 
 ### ⌨️ Keyboard Shortcuts System
diff --git a/docs/DOCUMENTATION_SUMMARY.md b/docs/DOCUMENTATION_SUMMARY.md
new file mode 100644
index 0000000..17a7a87
--- /dev/null
+++ b/docs/DOCUMENTATION_SUMMARY.md
@@ -0,0 +1,109 @@
+# Documentation Consolidation Summary
+
+## Overview
+This document summarizes the documentation consolidation and updates performed to improve the TheChart project documentation structure.
+
+## Changes Made
+
+### 1. Documentation Structure Consolidation
+- **Removed**: `docs/UI_IMPROVEMENTS.md` (redundant file)
+- **Consolidated**: UI/UX improvements documentation into `docs/FEATURES.md`
+- **Enhanced**: Main `README.md` with recent updates section
+- **Updated**: `docs/README.md` (documentation index) with comprehensive navigation
+
+### 2. Content Integration
+
+#### FEATURES.md Enhancements
+- **Added**: Modern UI/UX System section (new in v1.9.5)
+- **Added**: Professional Theme Engine documentation
+- **Added**: Comprehensive Keyboard Shortcuts section
+- **Added**: Settings and Theme Management documentation
+- **Added**: Smart Tooltip System documentation
+- **Added**: Enhanced Technical Architecture section
+- **Added**: UI/UX Technical Implementation section
+
+#### CHANGELOG.md Updates
+- **Added**: Version 1.9.5 with comprehensive UI/UX overhaul documentation
+- **Added**: Settings and Configuration System section
+- **Added**: Enhanced User Experience section
+- **Added**: Technical Architecture Improvements section
+
+#### README.md Improvements
+- **Updated**: Title and description to emphasize modern UI/UX
+- **Added**: Recent Major Updates section highlighting v1.9.5 improvements
+- **Added**: Quick start guidance for new users
+- **Updated**: Documentation links with better descriptions
+- **Added**: Documentation navigation guide reference
+
+### 3. Cross-Reference Updates
+- **Updated**: All internal links to reflect consolidated structure
+- **Enhanced**: Documentation index with comprehensive navigation
+- **Added**: Task-based navigation in docs/README.md
+- **Improved**: User type-based documentation guidance
+
+## Current Documentation Structure
+
+```
+docs/
+├── README.md              # Documentation index and navigation guide
+├── FEATURES.md            # Complete feature documentation (includes UI/UX)
+├── KEYBOARD_SHORTCUTS.md  # Comprehensive shortcut reference
+├── EXPORT_SYSTEM.md       # Data export functionality
+├── DEVELOPMENT.md         # Development setup and testing
+├── CHANGELOG.md           # Version history and improvements
+└── DOCUMENTATION_SUMMARY.md # This summary (new)
+
+README.md                  # Main project README with quick start
+```
+
+## Documentation Highlights
+
+### For End Users
+1. **Modern UI/UX**: Complete documentation of the new theme system
+2. **Keyboard Efficiency**: Comprehensive shortcut system documentation
+3. **Feature Guidance**: Consolidated feature documentation with examples
+4. **Quick Navigation**: Task-based and user-type-based navigation
+
+### For Developers
+1. **Technical Architecture**: Enhanced architecture documentation
+2. **UI/UX Implementation**: Technical details of theme system
+3. **Code Organization**: Clear separation of concerns documentation
+4. **Development Workflow**: Comprehensive development guide
+
+## Quality Improvements
+
+### Content Quality
+- **Comprehensive Coverage**: All major features and improvements documented
+- **Clear Structure**: Hierarchical organization with clear headings
+- **Practical Examples**: Code snippets and usage examples maintained
+- **Cross-References**: Better linking between related sections
+
+### User Experience
+- **Progressive Disclosure**: Information organized by user expertise level
+- **Task-Oriented**: Documentation organized around user tasks
+- **Quick Access**: Multiple entry points and navigation paths
+- **Searchable**: Clear headings and consistent formatting
+
+### Maintenance
+- **Reduced Redundancy**: Eliminated duplicate information
+- **Single Source of Truth**: Consolidated information reduces maintenance burden
+- **Version Alignment**: Documentation synchronized with current codebase
+- **Future-Proof**: Structure supports easy updates and additions
+
+## Next Steps
+
+### Recommended Maintenance
+1. **Keep Features Updated**: Update FEATURES.md as new UI/UX improvements are added
+2. **Maintain Changelog**: Continue detailed changelog entries for version tracking
+3. **Review Navigation**: Periodically review docs/README.md navigation for completeness
+4. **User Feedback**: Collect user feedback on documentation effectiveness
+
+### Future Enhancements
+1. **Screenshots**: Consider adding screenshots of the new UI themes
+2. **Video Guides**: Potential for video demonstrations of key features
+3. **API Documentation**: If public APIs develop, consider separate API docs
+4. **Internationalization**: Structure supports future translation efforts
+
+---
+
+**Documentation consolidation completed**: All major UI/UX improvements are now properly documented and easily discoverable through the improved navigation structure.
diff --git a/docs/FEATURES.md b/docs/FEATURES.md
index 64754aa..7f535ce 100644
--- a/docs/FEATURES.md
+++ b/docs/FEATURES.md
@@ -1,7 +1,49 @@
 # TheChart - Features Documentation
 
 ## Overview
-TheChart is a comprehensive medication tracking application that allows users to monitor medication intake, symptom tracking, and visualize treatment progress over time.
+TheChart is a comprehensive medication tracking application with a modern, professional UI that allows users to monitor medication intake, track symptoms, and visualize treatment progress over time.
+
+## 🎨 Modern UI/UX System (New in v1.9.5)
+
+### Professional Theme Engine
+TheChart features a sophisticated theme system powered by ttkthemes, offering 8 carefully curated professional themes.
+
+#### Available Themes:
+- **Arc**: Modern flat design with subtle shadows
+- **Equilux**: Dark theme with excellent contrast
+- **Adapta**: Clean, minimalist design
+- **Yaru**: Ubuntu-inspired modern interface
+- **Ubuntu**: Official Ubuntu styling
+- **Plastik**: Classic professional appearance
+- **Breeze**: KDE-inspired clean design
+- **Elegance**: Sophisticated dark theme
+
+#### UI Enhancements:
+- **Modern Styling**: Card-style frames, enhanced buttons, professional form controls
+- **Smart Tooltips**: Context-sensitive help for all interactive elements
+- **Improved Tables**: Better selection highlighting and alternating row colors
+- **Settings System**: Comprehensive preferences with theme persistence
+- **Responsive Design**: Automatic layout adjustments and scaling
+
+### ⌨️ Comprehensive Keyboard Shortcuts
+Professional keyboard shortcut system for efficient navigation and operation.
+
+#### File Operations:
+- **Ctrl+S**: Save/Add new entry
+- **Ctrl+Q**: Quit application (with confirmation)
+- **Ctrl+E**: Export data
+
+#### Data Management:
+- **Ctrl+N**: Clear entries
+- **Ctrl+R / F5**: Refresh data
+- **Delete**: Delete selected entry
+- **Escape**: Clear selection
+
+#### Window Management:
+- **Ctrl+M**: Manage medicines
+- **Ctrl+P**: Manage pathologies
+- **F1**: Show keyboard shortcuts help
+- **F2**: Open settings window
 
 ## Core Features
 
@@ -37,6 +79,36 @@ Each medicine includes:
 2. **Manual Configuration**: Edit `medicines.json` directly
 3. **Programmatically**: Use the MedicineManager API
 
+### ⚙️ Settings and Theme Management
+Advanced configuration system allowing users to customize their experience.
+
+#### Settings Window (F2):
+- **Theme Selection**: Choose from 8 professional themes with live preview
+- **UI Preferences**: Font scaling, window behavior options
+- **About Information**: Detailed application and version information
+- **Tabbed Interface**: Organized settings categories for easy navigation
+
+#### Theme Features:
+- **Real-time Switching**: No restart required for theme changes
+- **Persistence**: Selected theme remembered between sessions
+- **Quick Access**: Theme menu for instant switching
+- **Fallback Handling**: Graceful handling if themes fail to load
+
+### 💡 Smart Tooltip System
+Context-sensitive help system providing guidance throughout the application.
+
+#### Tooltip Types:
+- **Pathology Scales**: Usage guidance for symptom tracking
+- **Medicine Checkboxes**: Medication information and dosage details
+- **Action Buttons**: Functionality description with keyboard shortcuts
+- **Form Controls**: Input guidance and format requirements
+
+#### Features:
+- **Delayed Display**: Non-intrusive timing (500-800ms delay)
+- **Theme-aware Styling**: Tooltips match selected theme
+- **Smart Positioning**: Automatic placement to avoid screen edges
+- **Rich Content**: Multi-line descriptions with formatting
+
 ### 💊 Advanced Dose Tracking
 Comprehensive dose tracking system that records exact timestamps and dosages throughout the day.
 
@@ -192,24 +264,49 @@ Comprehensive keyboard shortcuts for efficient navigation and data entry.
 
 ## Technical Architecture
 
-### 🏗️ Modular Design
-- **MedicineManager**: Core medicine CRUD operations
-- **PathologyManager**: Symptom and pathology management
-- **GraphManager**: All graph-related operations and visualizations
-- **UIManager**: User interface creation and management
-- **DataManager**: CSV operations and data persistence
+### � Modern UI Architecture
+- **ThemeManager**: Centralized theme management with dynamic switching
+- **TooltipManager**: Smart tooltip system with context-sensitive help
+- **UIManager**: Enhanced UI component creation with theme integration
+- **SettingsWindow**: Advanced configuration interface with persistence
 
-### 🔧 Configuration Management
-- **JSON-based Configuration**: `medicines.json` and `pathologies.json`
-- **Dynamic Loading**: Runtime configuration updates
-- **Validation**: Input validation and error handling
-- **Backward Compatibility**: Seamless updates and migrations
+### 🏗️ Core Application Design
+- **MedicineManager**: Core medicine CRUD operations with JSON persistence
+- **PathologyManager**: Symptom and pathology management system
+- **GraphManager**: Professional graph rendering with matplotlib integration
+- **DataManager**: Robust CSV operations and data persistence with validation
 
-### 📈 Data Processing
+### 🔧 Configuration and Data Management
+- **JSON-based Configuration**: `medicines.json` and `pathologies.json` for easy management
+- **Dynamic Loading**: Runtime configuration updates without restarts
+- **Data Validation**: Comprehensive input validation and error handling
+- **Backward Compatibility**: Seamless updates and migrations across versions
+
+### 📈 Advanced Data Processing
 - **Pandas Integration**: Efficient data manipulation and analysis
-- **Matplotlib Visualization**: Professional graph rendering
-- **Robust Parsing**: Handles various data formats and edge cases
-- **Real-time Calculations**: Dynamic dose totals and averages
+- **Real-time Calculations**: Dynamic dose totals, averages, and statistics
+- **Robust Parsing**: Handles various data formats and edge cases gracefully
+- **Performance Optimization**: Efficient batch operations and caching
+
+## UI/UX Technical Implementation
+
+### 🎭 Theme System Architecture
+- **Multiple Theme Support**: 8 curated professional themes
+- **Dynamic Style Application**: Real-time theme switching without restart
+- **Color Extraction**: Automatic color scheme detection and application
+- **Fallback Mechanisms**: Graceful handling when themes fail to load
+
+### 💡 Enhanced User Experience
+- **Smart Tooltips**: Context-sensitive help with delayed, non-intrusive display
+- **Modern Styling**: Card-style frames, enhanced buttons, professional form controls
+- **Improved Tables**: Better selection highlighting and alternating row colors
+- **Responsive Design**: Automatic layout adjustments and proper scaling
+
+### ⚙️ Settings and Persistence
+- **Configuration Management**: Theme and preference persistence across sessions
+- **Tabbed Settings Interface**: Organized categories for easy navigation
+- **Live Preview**: Real-time theme preview in settings
+- **Error Recovery**: Robust handling of corrupted settings with defaults
 
 ## Deployment and Distribution
 
diff --git a/docs/README.md b/docs/README.md
index b610e29..d09d4f0 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,21 +1,27 @@
 # TheChart Documentation
 
-Welcome to TheChart documentation! This guide will help you navigate the available documentation.
+Welcome to TheChart documentation! This guide will help you navigate the available documentation for the modern medication tracking application.
 
 ## 📖 Documentation Index
 
 ### For Users
 - **[README.md](../README.md)** - Quick start guide and installation
-- **[Features Guide](FEATURES.md)** - Complete feature documentation
+- **[Features Guide](FEATURES.md)** - Complete feature documentation including new UI/UX improvements
+  - Modern Theme System (8 Professional Themes)
+  - Advanced Keyboard Shortcuts
+  - Smart Tooltip System
   - Modular Medicine System
   - Advanced Dose Tracking
   - Graph Visualizations
   - Data Management
-  - Keyboard Shortcuts
 - **[Keyboard Shortcuts](KEYBOARD_SHORTCUTS.md)** - Comprehensive shortcut reference
-  - File operations shortcuts
-  - Data management shortcuts
-  - Navigation shortcuts
+  - File operations shortcuts (Ctrl+S, Ctrl+Q, Ctrl+E)
+  - Data management shortcuts (Ctrl+N, Ctrl+R, F5)
+  - Navigation shortcuts (Ctrl+M, Ctrl+P, F1, F2)
+- **[Export System](EXPORT_SYSTEM.md)** - Data export functionality and formats
+  - JSON, XML, and PDF export options
+  - Graph visualization inclusion
+  - Export manager architecture
 
 ### For Developers
 - **[Development Guide](DEVELOPMENT.md)** - Development setup and testing
@@ -26,53 +32,69 @@ Welcome to TheChart documentation! This guide will help you navigate the availab
 
 ### Project History
 - **[Changelog](CHANGELOG.md)** - Version history and feature evolution
-  - Recent updates and improvements
-  - Migration notes
-  - Future roadmap
+  - Recent UI/UX overhaul (v1.9.5)
+  - Keyboard shortcuts system (v1.7.0)
+  - Medicine and dose tracking improvements
+  - Migration notes and future roadmap
 
 ## 🚀 Quick Navigation
 
 ### Getting Started
 1. **Installation**: See [README.md - Installation](../README.md#installation)
 2. **First Run**: See [README.md - Running the Application](../README.md#running-the-application)
-3. **Key Features**: See [FEATURES.md](FEATURES.md)
+3. **UI/UX Features**: See [FEATURES.md - Modern UI/UX System](FEATURES.md#-modern-uiux-system-new-in-v195)
+
+### Using the Application
+1. **Theme Selection**: See [FEATURES.md - Settings and Theme Management](FEATURES.md#️-settings-and-theme-management)
+2. **Keyboard Shortcuts**: See [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md)
+3. **Medicine Management**: See [FEATURES.md - Modular Medicine System](FEATURES.md#-modular-medicine-system)
+4. **Dose Tracking**: See [FEATURES.md - Advanced Dose Tracking](FEATURES.md#-advanced-dose-tracking)
+5. **Data Export**: See [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
 
 ### Development
 1. **Setup**: See [DEVELOPMENT.md - Development Environment Setup](DEVELOPMENT.md#development-environment-setup)
 2. **Testing**: See [DEVELOPMENT.md - Testing Framework](DEVELOPMENT.md#testing-framework)
-3. **Contributing**: See [DEVELOPMENT.md - Development Workflow](DEVELOPMENT.md#development-workflow)
+3. **Architecture**: See [FEATURES.md - Technical Architecture](FEATURES.md#technical-architecture)
+4. **Contributing**: See [DEVELOPMENT.md - Development Workflow](DEVELOPMENT.md#development-workflow)
 
-### Advanced Usage
-1. **Medicine Management**: See [FEATURES.md - Modular Medicine System](FEATURES.md#-modular-medicine-system)
-2. **Dose Tracking**: See [FEATURES.md - Advanced Dose Tracking](FEATURES.md#-advanced-dose-tracking)
-3. **Visualizations**: See [FEATURES.md - Enhanced Graph Visualization](FEATURES.md#-enhanced-graph-visualization)
+## 📋 What's New in Documentation
 
-## 📋 Documentation Standards
+### Recent Updates (v1.9.5)
+- **Consolidated Structure**: Merged UI improvements into main features documentation
+- **Enhanced Features Guide**: Added comprehensive UI/UX documentation
+- **Updated Changelog**: Detailed UI/UX overhaul documentation
+- **Improved Navigation**: Better cross-referencing between documents
 
-All documentation follows these principles:
-- **Clear Structure**: Hierarchical organization with clear headings
-- **Practical Examples**: Code snippets and usage examples
-- **Up-to-date**: Synchronized with current codebase
-- **Comprehensive**: Covers all major features and workflows
-- **Cross-referenced**: Links between related sections
+### Documentation Highlights
+- **Professional UI/UX**: Complete documentation of the new theme system
+- **Keyboard Efficiency**: Comprehensive shortcut system documentation
+- **Developer-Friendly**: Enhanced development and testing documentation
+- **User-Focused**: Clear separation of user vs developer documentation
 
 ## 🔍 Finding Information
 
 ### By Topic
 - **Installation & Setup** → [README.md](../README.md)
+- **UI/UX and Themes** → [FEATURES.md - Modern UI/UX System](FEATURES.md#-modern-uiux-system-new-in-v195)
 - **Feature Usage** → [FEATURES.md](FEATURES.md)
+- **Keyboard Shortcuts** → [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md)
+- **Data Export** → [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
 - **Development** → [DEVELOPMENT.md](DEVELOPMENT.md)
 - **Version History** → [CHANGELOG.md](CHANGELOG.md)
 
 ### By User Type
 - **End Users** → Start with [README.md](../README.md), then [FEATURES.md](FEATURES.md)
-- **Developers** → [DEVELOPMENT.md](DEVELOPMENT.md) and [CHANGELOG.md](CHANGELOG.md)
+- **Power Users** → [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md) and [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
+- **Developers** → [DEVELOPMENT.md](DEVELOPMENT.md) and [FEATURES.md - Technical Architecture](FEATURES.md#technical-architecture)
 - **Contributors** → All documentation, especially [DEVELOPMENT.md](DEVELOPMENT.md)
 
 ### By Task
 - **Install TheChart** → [README.md - Installation](../README.md#installation)
+- **Change Theme** → [FEATURES.md - Settings and Theme Management](FEATURES.md#️-settings-and-theme-management)
+- **Learn Shortcuts** → [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md)
 - **Add New Medicine** → [FEATURES.md - Modular Medicine System](FEATURES.md#-modular-medicine-system)
 - **Track Doses** → [FEATURES.md - Advanced Dose Tracking](FEATURES.md#-advanced-dose-tracking)
+- **Export Data** → [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
 - **Run Tests** → [DEVELOPMENT.md - Testing Framework](DEVELOPMENT.md#testing-framework)
 - **Deploy Application** → [README.md - Deployment](../README.md#deployment)
 
diff --git a/pyproject.toml b/pyproject.toml
index 58d90a7..b30f81e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,7 @@ dependencies = [
     "pandas>=2.3.1",
     "reportlab>=4.4.3",
     "tk>=0.1.0",
+    "ttkthemes>=3.2.2",
 ]
 
 [dependency-groups]
diff --git a/requirements.in b/requirements.in
index 7fdeb24..ad07daf 100644
--- a/requirements.in
+++ b/requirements.in
@@ -3,3 +3,4 @@ matplotlib
 pandas
 dotenv
 colorlog
+ttkthemes
diff --git a/requirements.txt b/requirements.txt
index 50c70e2..ba48d93 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,9 @@ packaging==25.0
 pandas==2.3.1
     # via -r requirements.in
 pillow==11.3.0
-    # via matplotlib
+    # via
+    #   matplotlib
+    #   ttkthemes
 pyparsing==3.2.3
     # via matplotlib
 python-dateutil==2.9.0.post0
@@ -39,5 +41,7 @@ six==1.17.0
     # via python-dateutil
 tk==0.1.0
     # via -r requirements.in
+ttkthemes==3.2.2
+    # via -r requirements.in
 tzdata==2025.2
     # via pandas
diff --git a/src/main.py b/src/main.py
index 8c9d72a..071604f 100644
--- a/src/main.py
+++ b/src/main.py
@@ -17,6 +17,8 @@ from medicine_management_window import MedicineManagementWindow
 from medicine_manager import MedicineManager
 from pathology_management_window import PathologyManagementWindow
 from pathology_manager import PathologyManager
+from settings_window import SettingsWindow
+from theme_manager import ThemeManager
 from ui_manager import UIManager
 
 
@@ -44,6 +46,9 @@ class MedTrackerApp:
 
         logger.info(f"Log level: {LOG_LEVEL}")
 
+        # Initialize theme manager first
+        self.theme_manager: ThemeManager = ThemeManager(self.root, logger)
+
         if LOG_LEVEL == "DEBUG":
             logger.debug(f"Script name: {sys.argv[0]}")
             logger.debug(f"Logs path: {LOG_PATH}")
@@ -54,7 +59,11 @@ class MedTrackerApp:
         self.medicine_manager: MedicineManager = MedicineManager(logger=logger)
         self.pathology_manager: PathologyManager = PathologyManager(logger=logger)
         self.ui_manager: UIManager = UIManager(
-            root, logger, self.medicine_manager, self.pathology_manager
+            root,
+            logger,
+            self.medicine_manager,
+            self.pathology_manager,
+            self.theme_manager,
         )
         self.data_manager: DataManager = DataManager(
             self.filename, logger, self.medicine_manager, self.pathology_manager
@@ -103,7 +112,7 @@ class MedTrackerApp:
         import tkinter.ttk as ttk
 
         # --- Main Frame ---
-        main_frame: ttk.Frame = ttk.Frame(self.root, padding="10")
+        main_frame: ttk.Frame = ttk.Frame(self.root, padding="10", style="Card.TFrame")
         main_frame.grid(row=0, column=0, sticky="nsew")
 
         # Configure root window grid
@@ -206,9 +215,36 @@ class MedTrackerApp:
             label="Refresh Data", command=self.refresh_data_display, accelerator="F5"
         )
 
+        # Theme menu
+        theme_menu = tk.Menu(menubar, tearoff=0)
+        menubar.add_cascade(label="Theme", menu=theme_menu)
+
+        # Add quick theme options
+        available_themes = self.theme_manager.get_available_themes()
+        current_theme = self.theme_manager.get_current_theme()
+
+        for theme in available_themes:
+            theme_menu.add_radiobutton(
+                label=theme.title(),
+                command=lambda t=theme: self._change_theme(t),
+                value=theme == current_theme,
+            )
+
+        theme_menu.add_separator()
+        theme_menu.add_command(
+            label="More Settings...",
+            command=self._open_settings_window,
+        )
+
         # Help menu
         help_menu = tk.Menu(menubar, tearoff=0)
         menubar.add_cascade(label="Help", menu=help_menu)
+        help_menu.add_command(
+            label="Settings...",
+            command=self._open_settings_window,
+            accelerator="F2",
+        )
+        help_menu.add_separator()
         help_menu.add_command(
             label="Keyboard Shortcuts",
             command=self._show_keyboard_shortcuts,
@@ -237,6 +273,7 @@ class MedTrackerApp:
         self.root.bind("<Delete>", lambda e: self._delete_selected_entry())
         self.root.bind("<Escape>", lambda e: self._clear_selection())
         self.root.bind("<F1>", lambda e: self._show_keyboard_shortcuts())
+        self.root.bind("<F2>", lambda e: self._open_settings_window())
 
         # Make the window focusable so it can receive key events
         self.root.focus_set()
@@ -276,10 +313,24 @@ Table Operations:
 • Double-click: Edit entry
 
 Help:
-• F1: Show this help dialog"""
+• F1: Show this help dialog
+• F2: Open settings window"""
 
         messagebox.showinfo("Keyboard Shortcuts", shortcuts_text, parent=self.root)
 
+    def _change_theme(self, theme_name: str) -> None:
+        """Change the application theme."""
+        if self.theme_manager.apply_theme(theme_name):
+            self.ui_manager.update_status(
+                f"Theme changed to: {theme_name.title()}", "info"
+            )
+            # Refresh the menu to update radio button selection
+            self._setup_menu()
+        else:
+            self.ui_manager.update_status(
+                f"Failed to apply theme: {theme_name}", "error"
+            )
+
     def _show_about_dialog(self) -> None:
         """Show about dialog."""
         about_text = """TheChart - Medication Tracker
@@ -315,6 +366,11 @@ Use Ctrl+S to save entries and Ctrl+Q to quit."""
             self.root, self.medicine_manager, self._refresh_ui_after_config_change
         )
 
+    def _open_settings_window(self) -> None:
+        """Open the settings window."""
+        self.ui_manager.update_status("Opening settings window", "info")
+        SettingsWindow(self.root, self.theme_manager, self.ui_manager)
+
     def _refresh_ui_after_config_change(self) -> None:
         """Refresh UI components after pathology or medicine configuration changes."""
         self.ui_manager.update_status(
@@ -678,9 +734,13 @@ Use Ctrl+S to save entries and Ctrl+Q to quit."""
                     # Fallback - just use all columns
                     display_df = df
 
-                # Batch insert for better performance
-                for _index, row in display_df.iterrows():
-                    self.tree.insert(parent="", index="end", values=list(row))
+                # Batch insert for better performance with alternating row colors
+                for index, row in display_df.iterrows():
+                    # Add alternating row tags for better visibility
+                    tag = "evenrow" if index % 2 == 0 else "oddrow"
+                    self.tree.insert(
+                        parent="", index="end", values=list(row), tags=(tag,)
+                    )
                 logger.debug(f"Loaded {len(display_df)} entries into treeview.")
 
             # Update the graph
diff --git a/src/settings_window.py b/src/settings_window.py
new file mode 100644
index 0000000..a2cbcee
--- /dev/null
+++ b/src/settings_window.py
@@ -0,0 +1,324 @@
+"""Settings window for TheChart application."""
+
+import tkinter as tk
+from tkinter import messagebox, ttk
+
+
+class SettingsWindow:
+    """Settings window for application preferences."""
+
+    def __init__(self, parent: tk.Tk, theme_manager, ui_manager) -> None:
+        self.parent = parent
+        self.theme_manager = theme_manager
+        self.ui_manager = ui_manager
+
+        # Create window
+        self.window = tk.Toplevel(parent)
+        self.window.title("Settings - TheChart")
+        self.window.geometry("500x400")
+        self.window.resizable(False, False)
+
+        # Make window modal
+        self.window.transient(parent)
+        self.window.grab_set()
+
+        # Center the window
+        self._center_window()
+
+        # Setup UI
+        self._setup_ui()
+
+        # Set initial values
+        self._load_current_settings()
+
+    def _center_window(self) -> None:
+        """Center the settings window on the parent."""
+        self.window.update_idletasks()
+
+        # Get window dimensions
+        window_width = self.window.winfo_reqwidth()
+        window_height = self.window.winfo_reqheight()
+
+        # Get parent window position and size
+        parent_x = self.parent.winfo_x()
+        parent_y = self.parent.winfo_y()
+        parent_width = self.parent.winfo_width()
+        parent_height = self.parent.winfo_height()
+
+        # Calculate centered position
+        x = parent_x + (parent_width // 2) - (window_width // 2)
+        y = parent_y + (parent_height // 2) - (window_height // 2)
+
+        self.window.geometry(f"{window_width}x{window_height}+{x}+{y}")
+
+    def _setup_ui(self) -> None:
+        """Setup the settings UI."""
+        # Main container
+        main_frame = ttk.Frame(self.window, padding="20", style="Card.TFrame")
+        main_frame.pack(fill="both", expand=True)
+
+        # Title
+        title_label = ttk.Label(
+            main_frame,
+            text="Application Settings",
+            font=("TkDefaultFont", 16, "bold"),
+        )
+        title_label.pack(pady=(0, 20))
+
+        # Create notebook for different setting categories
+        notebook = ttk.Notebook(main_frame, style="Modern.TNotebook")
+        notebook.pack(fill="both", expand=True, pady=(0, 20))
+
+        # Theme settings tab
+        self._create_theme_tab(notebook)
+
+        # UI settings tab
+        self._create_ui_tab(notebook)
+
+        # About tab
+        self._create_about_tab(notebook)
+
+        # Button frame
+        button_frame = ttk.Frame(main_frame)
+        button_frame.pack(fill="x", pady=(10, 0))
+
+        # Buttons
+        ttk.Button(
+            button_frame,
+            text="Apply",
+            command=self._apply_settings,
+            style="Action.TButton",
+        ).pack(side="right", padx=(5, 0))
+
+        ttk.Button(
+            button_frame,
+            text="Cancel",
+            command=self._cancel,
+            style="Action.TButton",
+        ).pack(side="right")
+
+        ttk.Button(
+            button_frame,
+            text="OK",
+            command=self._ok,
+            style="Action.TButton",
+        ).pack(side="right", padx=(0, 5))
+
+    def _create_theme_tab(self, notebook: ttk.Notebook) -> None:
+        """Create the theme settings tab."""
+        theme_frame = ttk.Frame(notebook, style="Card.TFrame")
+        notebook.add(theme_frame, text="Theme")
+
+        # Theme selection
+        theme_label_frame = ttk.LabelFrame(
+            theme_frame, text="Theme Selection", style="Card.TLabelframe"
+        )
+        theme_label_frame.pack(fill="x", padx=10, pady=10)
+
+        ttk.Label(
+            theme_label_frame,
+            text="Choose your preferred theme:",
+            font=("TkDefaultFont", 10),
+        ).pack(anchor="w", padx=10, pady=(10, 5))
+
+        # Theme radio buttons
+        self.theme_var = tk.StringVar()
+        themes = self.theme_manager.get_available_themes()
+
+        theme_buttons_frame = ttk.Frame(theme_label_frame)
+        theme_buttons_frame.pack(fill="x", padx=10, pady=(0, 10))
+
+        # Create radio buttons in a grid
+        for i, theme in enumerate(themes):
+            row = i // 3
+            col = i % 3
+
+            ttk.Radiobutton(
+                theme_buttons_frame,
+                text=theme.title(),
+                variable=self.theme_var,
+                value=theme,
+                style="Modern.TCheckbutton",
+            ).grid(row=row, column=col, sticky="w", padx=5, pady=2)
+
+        # Theme preview info
+        preview_frame = ttk.LabelFrame(
+            theme_frame, text="Theme Preview", style="Card.TLabelframe"
+        )
+        preview_frame.pack(fill="both", expand=True, padx=10, pady=(0, 10))
+
+        preview_text = tk.Text(
+            preview_frame,
+            height=6,
+            wrap="word",
+            font=("TkDefaultFont", 9),
+            state="disabled",
+        )
+        preview_text.pack(fill="both", expand=True, padx=10, pady=10)
+
+        # Theme change callback
+        def on_theme_change():
+            selected_theme = self.theme_var.get()
+            preview_text.config(state="normal")
+            preview_text.delete("1.0", "end")
+            preview_text.insert(
+                "1.0",
+                f"Selected theme: {selected_theme.title()}\\n\\n"
+                "Theme changes will be applied when you click 'Apply' or 'OK'. "
+                "The new theme will affect all windows and UI elements "
+                "in the application.",
+            )
+            preview_text.config(state="disabled")
+
+        self.theme_var.trace("w", lambda *args: on_theme_change())
+
+    def _create_ui_tab(self, notebook: ttk.Notebook) -> None:
+        """Create the UI settings tab."""
+        ui_frame = ttk.Frame(notebook, style="Card.TFrame")
+        notebook.add(ui_frame, text="Interface")
+
+        # Font settings
+        font_frame = ttk.LabelFrame(
+            ui_frame, text="Font Settings", style="Card.TLabelframe"
+        )
+        font_frame.pack(fill="x", padx=10, pady=10)
+
+        ttk.Label(
+            font_frame,
+            text="Font size adjustments (requires restart):",
+            font=("TkDefaultFont", 10),
+        ).pack(anchor="w", padx=10, pady=10)
+
+        # Font size scale
+        self.font_scale_var = tk.DoubleVar(value=1.0)
+        font_scale = ttk.Scale(
+            font_frame,
+            from_=0.8,
+            to=1.5,
+            variable=self.font_scale_var,
+            orient="horizontal",
+            style="Modern.Horizontal.TScale",
+        )
+        font_scale.pack(fill="x", padx=10, pady=(0, 10))
+
+        # Scale labels
+        scale_labels_frame = ttk.Frame(font_frame)
+        scale_labels_frame.pack(fill="x", padx=10, pady=(0, 10))
+
+        ttk.Label(scale_labels_frame, text="Small").pack(side="left")
+        ttk.Label(scale_labels_frame, text="Large").pack(side="right")
+        ttk.Label(scale_labels_frame, text="Normal").pack()
+
+        # Window settings
+        window_frame = ttk.LabelFrame(
+            ui_frame, text="Window Settings", style="Card.TLabelframe"
+        )
+        window_frame.pack(fill="x", padx=10, pady=(0, 10))
+
+        # Remember window size
+        self.remember_size_var = tk.BooleanVar(value=True)
+        ttk.Checkbutton(
+            window_frame,
+            text="Remember window size and position",
+            variable=self.remember_size_var,
+            style="Modern.TCheckbutton",
+        ).pack(anchor="w", padx=10, pady=10)
+
+        # Always on top
+        self.always_on_top_var = tk.BooleanVar(value=False)
+        ttk.Checkbutton(
+            window_frame,
+            text="Keep window always on top",
+            variable=self.always_on_top_var,
+            style="Modern.TCheckbutton",
+        ).pack(anchor="w", padx=10, pady=(0, 10))
+
+    def _create_about_tab(self, notebook: ttk.Notebook) -> None:
+        """Create the about tab."""
+        about_frame = ttk.Frame(notebook, style="Card.TFrame")
+        notebook.add(about_frame, text="About")
+
+        # App info
+        info_frame = ttk.LabelFrame(
+            about_frame, text="Application Information", style="Card.TLabelframe"
+        )
+        info_frame.pack(fill="both", expand=True, padx=10, pady=10)
+
+        about_text = tk.Text(
+            info_frame,
+            wrap="word",
+            font=("TkDefaultFont", 10),
+            state="disabled",
+            bg=self.theme_manager.get_theme_colors()["bg"],
+            fg=self.theme_manager.get_theme_colors()["fg"],
+        )
+        about_text.pack(fill="both", expand=True, padx=10, pady=10)
+
+        about_content = """TheChart - Medication Tracker
+
+Version: 1.9.5
+Built with: Python, Tkinter, ttkthemes
+
+Features:
+• Modern themed interface with multiple themes
+• Medication and pathology tracking
+• Visual graphs and charts
+• Data export capabilities
+• Keyboard shortcuts for efficiency
+• Customizable UI settings
+
+This application helps you track your daily medications and health
+conditions with an intuitive, modern interface.
+
+Enhanced with ttkthemes for better visual appeal and user experience."""
+
+        about_text.config(state="normal")
+        about_text.insert("1.0", about_content)
+        about_text.config(state="disabled")
+
+    def _load_current_settings(self) -> None:
+        """Load current application settings."""
+        # Set current theme
+        current_theme = self.theme_manager.get_current_theme()
+        self.theme_var.set(current_theme)
+
+        # Trigger theme change to update preview
+        if hasattr(self, "theme_var"):
+            self.theme_var.set(current_theme)
+
+    def _apply_settings(self) -> None:
+        """Apply the selected settings."""
+        # Apply theme if changed
+        selected_theme = self.theme_var.get()
+        current_theme = self.theme_manager.get_current_theme()
+
+        if selected_theme != current_theme:
+            if self.theme_manager.apply_theme(selected_theme):
+                self.ui_manager.update_status(
+                    f"Theme changed to: {selected_theme.title()}", "info"
+                )
+            else:
+                messagebox.showerror(
+                    "Error",
+                    f"Failed to apply theme: {selected_theme}",
+                    parent=self.window,
+                )
+                return
+
+        # Apply other settings (font size, window settings, etc.)
+        # These would typically be saved to a config file
+
+        messagebox.showinfo(
+            "Settings Applied",
+            "Settings have been applied successfully!",
+            parent=self.window,
+        )
+
+    def _ok(self) -> None:
+        """Apply settings and close window."""
+        self._apply_settings()
+        self.window.destroy()
+
+    def _cancel(self) -> None:
+        """Close window without applying settings."""
+        self.window.destroy()
diff --git a/src/theme_manager.py b/src/theme_manager.py
new file mode 100644
index 0000000..e91a911
--- /dev/null
+++ b/src/theme_manager.py
@@ -0,0 +1,298 @@
+"""Theme manager for the application using ttkthemes."""
+
+import logging
+import tkinter as tk
+from tkinter import ttk
+
+from ttkthemes import ThemedStyle
+
+
+class ThemeManager:
+    """Manages application themes and styling."""
+
+    def __init__(self, root: tk.Tk, logger: logging.Logger) -> None:
+        self.root = root
+        self.logger = logger
+        self.style: ThemedStyle | None = None
+        self.current_theme: str = "arc"  # Default theme
+
+        # Available themes - these are some of the best looking ones
+        self.available_themes = [
+            "arc",
+            "equilux",
+            "adapta",
+            "yaru",
+            "ubuntu",
+            "plastik",
+            "breeze",
+            "elegance",
+        ]
+
+        self.initialize_theme()
+
+    def initialize_theme(self) -> None:
+        """Initialize the themed style."""
+        try:
+            self.style = ThemedStyle(self.root)
+            self.apply_theme(self.current_theme)
+            self._configure_custom_styles()
+            self.logger.info(
+                f"Theme manager initialized with theme: {self.current_theme}"
+            )
+        except Exception as e:
+            self.logger.error(f"Failed to initialize theme manager: {e}")
+            # Fallback to default ttk styling
+            self.style = ttk.Style()
+
+    def apply_theme(self, theme_name: str) -> bool:
+        """Apply a specific theme."""
+        try:
+            if self.style and theme_name in self.get_available_themes():
+                self.style.set_theme(theme_name)
+                self.current_theme = theme_name
+                self._configure_custom_styles()
+                self.logger.info(f"Applied theme: {theme_name}")
+                return True
+            else:
+                self.logger.warning(f"Theme '{theme_name}' not available")
+                return False
+        except Exception as e:
+            self.logger.error(f"Failed to apply theme '{theme_name}': {e}")
+            return False
+
+    def get_available_themes(self) -> list[str]:
+        """Get list of available themes."""
+        if self.style:
+            try:
+                # Get all available themes from ttkthemes
+                all_themes = self.style.theme_names()
+                # Filter to only include our curated list
+                return [theme for theme in self.available_themes if theme in all_themes]
+            except Exception as e:
+                self.logger.error(f"Failed to get available themes: {e}")
+                return self.available_themes
+        return self.available_themes
+
+    def get_current_theme(self) -> str:
+        """Get the currently active theme."""
+        return self.current_theme
+
+    def _configure_custom_styles(self) -> None:
+        """Configure custom styles for better appearance."""
+        if not self.style:
+            return
+
+        try:
+            # Get current theme colors for consistent styling
+            colors = self.get_theme_colors()
+
+            # Configure frame styles with better padding and borders
+            self.style.configure(
+                "Card.TFrame",
+                relief="flat",
+                borderwidth=0,
+                background=colors["bg"],
+            )
+
+            # Configure label frame styles with modern appearance
+            self.style.configure(
+                "Card.TLabelframe",
+                relief="solid",
+                borderwidth=1,
+                background=colors["bg"],
+                foreground=colors["fg"],
+                padding=(10, 5, 10, 10),
+            )
+
+            self.style.configure(
+                "Card.TLabelframe.Label",
+                background=colors["bg"],
+                foreground=colors["fg"],
+                font=("TkDefaultFont", 10, "bold"),
+            )
+
+            # Configure button styles for better appearance
+            self.style.configure(
+                "Action.TButton",
+                padding=(15, 8),
+                font=("TkDefaultFont", 9, "normal"),
+            )
+
+            # Configure entry styles with modern look
+            self.style.configure(
+                "Modern.TEntry",
+                padding=(8, 5),
+                borderwidth=1,
+                relief="solid",
+            )
+
+            # Configure scale styles for pathology inputs
+            self.style.configure(
+                "Modern.Horizontal.TScale",
+                borderwidth=0,
+                background=colors["bg"],
+                troughcolor="#e0e0e0",
+                lightcolor=colors["select_bg"],
+                darkcolor=colors["select_bg"],
+                focuscolor=colors["select_bg"],
+            )
+
+            # Configure treeview for better data display
+            self.style.configure(
+                "Modern.Treeview",
+                rowheight=28,
+                borderwidth=1,
+                relief="solid",
+                background=colors["bg"],
+                foreground=colors["fg"],
+                fieldbackground=colors["bg"],
+                selectbackground=colors["select_bg"],
+                selectforeground=colors["select_fg"],
+            )
+
+            self.style.configure(
+                "Modern.Treeview.Heading",
+                padding=(8, 6),
+                relief="flat",
+                borderwidth=1,
+                background=colors["select_bg"],
+                foreground=colors["select_fg"],
+                font=("TkDefaultFont", 9, "bold"),
+            )
+
+            # Configure comprehensive row selection colors for better visibility
+            self.style.map(
+                "Modern.Treeview",
+                background=[
+                    ("selected", colors["select_bg"]),
+                    ("active", colors["select_bg"]),
+                    ("focus", colors["select_bg"]),
+                    ("", colors["bg"]),
+                ],
+                foreground=[
+                    ("selected", colors["select_fg"]),
+                    ("active", colors["select_fg"]),
+                    ("focus", colors["select_fg"]),
+                    ("", colors["fg"]),
+                ],
+                selectbackground=[
+                    ("focus", colors["select_bg"]),
+                    ("", colors["select_bg"]),
+                ],
+                selectforeground=[
+                    ("focus", colors["select_fg"]),
+                    ("", colors["select_fg"]),
+                ],
+            )
+
+            # Configure notebook tabs with modern styling
+            self.style.configure(
+                "Modern.TNotebook.Tab",
+                padding=(15, 8),
+                borderwidth=1,
+                relief="flat",
+            )
+
+            self.style.map(
+                "Modern.TNotebook.Tab",
+                background=[("selected", colors["select_bg"])],
+                foreground=[("selected", colors["select_fg"])],
+            )
+
+            # Configure checkbutton for medicine selection
+            self.style.configure(
+                "Modern.TCheckbutton",
+                padding=(8, 4),
+                background=colors["bg"],
+                foreground=colors["fg"],
+                focuscolor=colors["select_bg"],
+            )
+
+            self.logger.debug("Enhanced custom styles configured")
+
+        except Exception as e:
+            self.logger.error(f"Failed to configure custom styles: {e}")
+
+    def configure_widget_style(self, widget: tk.Widget, style_name: str) -> None:
+        """Apply a specific style to a widget."""
+        try:
+            if hasattr(widget, "configure") and self.style:
+                widget.configure(style=style_name)
+        except Exception as e:
+            self.logger.error(f"Failed to configure widget style '{style_name}': {e}")
+
+    def get_theme_colors(self) -> dict[str, str]:
+        """Get current theme colors for custom widgets."""
+        if not self.style:
+            return {
+                "bg": "#ffffff",
+                "fg": "#000000",
+                "select_bg": "#3584e4",
+                "select_fg": "#ffffff",
+                "alt_bg": "#f5f5f5",
+            }
+
+        try:
+            # Get colors from current theme
+            bg = self.style.lookup("TFrame", "background") or "#ffffff"
+            fg = self.style.lookup("TLabel", "foreground") or "#000000"
+
+            # Try to get better selection colors from different widget states
+            select_bg = (
+                self.style.lookup("TButton", "background", ["pressed"])
+                or self.style.lookup("TButton", "background", ["active"])
+                or self.style.lookup("Treeview", "selectbackground")
+                or "#0078d4"  # Modern blue fallback
+            )
+            select_fg = (
+                self.style.lookup("TButton", "foreground", ["pressed"])
+                or self.style.lookup("TButton", "foreground", ["active"])
+                or self.style.lookup("Treeview", "selectforeground")
+                or "#ffffff"  # White fallback
+            )
+
+            # Ensure contrast - if selection colors are too similar to background,
+            # use fallbacks
+            if select_bg == bg or select_bg.lower() == bg.lower():
+                select_bg = "#0078d4" if bg != "#0078d4" else "#0066cc"
+
+            if select_fg == fg or select_fg.lower() == fg.lower():
+                select_fg = "#ffffff" if fg != "#ffffff" else "#000000"
+
+            # Calculate alternating row color
+            if bg.startswith("#"):
+                try:
+                    rgb = tuple(int(bg[i : i + 2], 16) for i in (1, 3, 5))
+                    if sum(rgb) > 384:  # Light theme
+                        alt_bg = (
+                            f"#{max(0, rgb[0] - 10):02x}"
+                            f"{max(0, rgb[1] - 10):02x}"
+                            f"{max(0, rgb[2] - 10):02x}"
+                        )
+                    else:  # Dark theme
+                        alt_bg = (
+                            f"#{min(255, rgb[0] + 10):02x}"
+                            f"{min(255, rgb[1] + 10):02x}"
+                            f"{min(255, rgb[2] + 10):02x}"
+                        )
+                except ValueError:
+                    alt_bg = "#f5f5f5"
+            else:
+                alt_bg = "#f5f5f5"
+
+            return {
+                "bg": bg,
+                "fg": fg,
+                "select_bg": select_bg,
+                "select_fg": select_fg,
+                "alt_bg": alt_bg,  # Add alternating background color
+            }
+        except Exception as e:
+            self.logger.error(f"Failed to get theme colors: {e}")
+            return {
+                "bg": "#ffffff",
+                "fg": "#000000",
+                "select_bg": "#3584e4",
+                "select_fg": "#ffffff",
+                "alt_bg": "#f5f5f5",
+            }
diff --git a/src/tooltip_system.py b/src/tooltip_system.py
new file mode 100644
index 0000000..4dec2a4
--- /dev/null
+++ b/src/tooltip_system.py
@@ -0,0 +1,163 @@
+"""Tooltip system for enhanced user experience."""
+
+import tkinter as tk
+
+
+class ToolTip:
+    """Create a tooltip for a given widget."""
+
+    def __init__(
+        self,
+        widget: tk.Widget,
+        text: str,
+        delay: int = 500,
+        wrap_length: int = 250,
+    ) -> None:
+        self.widget = widget
+        self.text = text
+        self.delay = delay
+        self.wrap_length = wrap_length
+        self.tooltip: tk.Toplevel | None = None
+        self.id_after: str | None = None
+
+        # Bind events
+        self.widget.bind("<Enter>", self._on_enter)
+        self.widget.bind("<Leave>", self._on_leave)
+        self.widget.bind("<ButtonPress>", self._on_leave)
+
+    def _on_enter(self, event: tk.Event | None = None) -> None:
+        """Mouse entered widget - schedule tooltip."""
+        self._cancel_scheduled()
+        self.id_after = self.widget.after(self.delay, self._show_tooltip)
+
+    def _on_leave(self, event: tk.Event | None = None) -> None:
+        """Mouse left widget - hide tooltip."""
+        self._cancel_scheduled()
+        self._hide_tooltip()
+
+    def _cancel_scheduled(self) -> None:
+        """Cancel any scheduled tooltip."""
+        if self.id_after:
+            self.widget.after_cancel(self.id_after)
+            self.id_after = None
+
+    def _show_tooltip(self) -> None:
+        """Display the tooltip."""
+        if self.tooltip:
+            return
+
+        # Get widget position
+        x = self.widget.winfo_rootx() + 25
+        y = self.widget.winfo_rooty() + 25
+
+        # Create tooltip window
+        self.tooltip = tk.Toplevel(self.widget)
+        self.tooltip.wm_overrideredirect(True)
+        self.tooltip.wm_geometry(f"+{x}+{y}")
+
+        # Create tooltip content
+        label = tk.Label(
+            self.tooltip,
+            text=self.text,
+            justify="left",
+            background="#ffffe0",
+            foreground="#000000",
+            relief="solid",
+            borderwidth=1,
+            font=("TkDefaultFont", "9", "normal"),
+            wraplength=self.wrap_length,
+            padx=8,
+            pady=6,
+        )
+        label.pack()
+
+        # Make sure tooltip appears above other windows
+        self.tooltip.lift()
+
+    def _hide_tooltip(self) -> None:
+        """Hide the tooltip."""
+        if self.tooltip:
+            self.tooltip.destroy()
+            self.tooltip = None
+
+    def update_text(self, new_text: str) -> None:
+        """Update the tooltip text."""
+        self.text = new_text
+
+
+class TooltipManager:
+    """Manages tooltips for UI elements."""
+
+    def __init__(self, theme_manager) -> None:
+        self.theme_manager = theme_manager
+        self.tooltips: list[ToolTip] = []
+
+    def add_tooltip(
+        self,
+        widget: tk.Widget,
+        text: str,
+        delay: int = 500,
+        wrap_length: int = 250,
+    ) -> ToolTip:
+        """Add a tooltip to a widget."""
+        tooltip = ToolTip(widget, text, delay, wrap_length)
+        self.tooltips.append(tooltip)
+        return tooltip
+
+    def add_scale_tooltip(self, scale_widget: tk.Widget, pathology_name: str) -> None:
+        """Add a specialized tooltip for pathology scales."""
+        text = (
+            f"Adjust your {pathology_name} level\\n"
+            "• Drag the slider to set your current level\\n"
+            "• Higher values typically indicate worse symptoms\\n"
+            "• Use the full range for accurate tracking"
+        )
+        self.add_tooltip(scale_widget, text, delay=800)
+
+    def add_medicine_tooltip(self, widget: tk.Widget, medicine_name: str) -> None:
+        """Add a specialized tooltip for medicine checkboxes."""
+        text = (
+            f"Mark if you took {medicine_name} today\\n"
+            "• Check the box when you've taken this medication\\n"
+            "• This helps track your medication adherence\\n"
+            "• You can add dose details when editing entries"
+        )
+        self.add_tooltip(widget, text, delay=600)
+
+    def add_button_tooltip(self, widget: tk.Widget, action: str) -> None:
+        """Add a tooltip for action buttons."""
+        tooltips_map = {
+            "save": (
+                "Save your current entry (Ctrl+S)\\nThis will add a new daily record"
+            ),
+            "export": (
+                "Export your data to various formats\\n"
+                "Supports CSV, PDF, and image exports"
+            ),
+            "refresh": (
+                "Reload data from file (F5)\\nUpdates the display with latest changes"
+            ),
+            "settings": (
+                "Open application settings (F2)\\nCustomize themes and preferences"
+            ),
+            "quit": (
+                "Exit the application (Ctrl+Q)\\nYour data will be automatically saved"
+            ),
+        }
+
+        text = tooltips_map.get(action, f"Perform {action} action")
+        self.add_tooltip(widget, text, delay=400)
+
+    def add_menu_tooltip(self, widget: tk.Widget, menu_type: str) -> None:
+        """Add tooltips for menu items."""
+        tooltips_map = {
+            "theme": (
+                "Quick theme selection\\nClick to instantly change the app's appearance"
+            ),
+            "file": "File operations\\nExport data and manage files",
+            "tools": ("Data management tools\\nConfigure medicines and pathologies"),
+            "help": ("Get help and information\\nKeyboard shortcuts and about dialog"),
+        }
+
+        text = tooltips_map.get(menu_type, "Menu options")
+        self.add_tooltip(widget, text, delay=600)
diff --git a/src/ui_manager.py b/src/ui_manager.py
index 6649801..9f0a871 100644
--- a/src/ui_manager.py
+++ b/src/ui_manager.py
@@ -11,6 +11,7 @@ from PIL import Image, ImageTk
 
 from medicine_manager import MedicineManager
 from pathology_manager import PathologyManager
+from tooltip_system import TooltipManager
 
 
 class UIManager:
@@ -22,17 +23,22 @@ class UIManager:
         logger: logging.Logger,
         medicine_manager: MedicineManager,
         pathology_manager: PathologyManager,
+        theme_manager,  # Import would create circular dependency
     ) -> None:
         self.root: tk.Tk = root
         self.logger: logging.Logger = logger
         self.medicine_manager = medicine_manager
         self.pathology_manager = pathology_manager
+        self.theme_manager = theme_manager
 
         # Status bar attributes
         self.status_bar: tk.Frame | None = None
         self.status_label: tk.Label | None = None
         self.file_info_label: tk.Label | None = None
 
+        # Initialize tooltip manager
+        self.tooltip_manager = TooltipManager(theme_manager)
+
     def setup_application_icon(self, img_path: str) -> bool:
         """Set up the application icon."""
         try:
@@ -70,13 +76,20 @@ class UIManager:
     def create_input_frame(self, parent_frame: ttk.Frame) -> dict[str, Any]:
         """Create and configure the input frame with all widgets."""
         # Create main container for the scrollable input frame
-        main_container = ttk.LabelFrame(parent_frame, text="New Entry")
+        main_container = ttk.LabelFrame(
+            parent_frame, text="New Entry", style="Card.TLabelframe"
+        )
         main_container.grid(row=1, column=0, padx=10, pady=10, sticky="nsew")
         main_container.grid_rowconfigure(0, weight=1)
         main_container.grid_columnconfigure(0, weight=1)
 
         # Create canvas and scrollbar for scrolling
-        canvas = tk.Canvas(main_container, highlightthickness=0)
+        theme_colors = self.theme_manager.get_theme_colors()
+        canvas = tk.Canvas(
+            main_container,
+            highlightthickness=0,
+            bg=theme_colors["bg"],
+        )
         scrollbar = ttk.Scrollbar(
             main_container, orient="vertical", command=canvas.yview
         )
@@ -164,7 +177,9 @@ class UIManager:
         ttk.Label(input_frame, text="Treatment:").grid(
             row=medicine_row, column=0, sticky="w", padx=5, pady=2
         )
-        medicine_frame = ttk.LabelFrame(input_frame, text="Medicine")
+        medicine_frame = ttk.LabelFrame(
+            input_frame, text="Medicine", style="Card.TLabelframe"
+        )
         medicine_frame.grid(row=medicine_row, column=1, padx=0, pady=10, sticky="nsew")
         medicine_frame.grid_columnconfigure(0, weight=1)
 
@@ -178,11 +193,19 @@ class UIManager:
                 text = f"{medicine.display_name} {medicine.dosage_info}"
                 medicine_vars[medicine_key] = (var, text)
 
-        for idx, (_med_name, (var, text)) in enumerate(medicine_vars.items()):
+        for idx, (med_key, (var, text)) in enumerate(medicine_vars.items()):
             # Just checkbox for medicine taken
-            ttk.Checkbutton(medicine_frame, text=text, variable=var).grid(
-                row=idx, column=0, sticky="w", padx=5, pady=2
+            checkbox = ttk.Checkbutton(
+                medicine_frame, text=text, variable=var, style="Modern.TCheckbutton"
             )
+            checkbox.grid(row=idx, column=0, sticky="w", padx=5, pady=2)
+
+            # Add tooltip for medicine checkbox
+            medicine = self.medicine_manager.get_medicine(med_key)
+            if medicine:
+                self.tooltip_manager.add_medicine_tooltip(
+                    checkbox, medicine.display_name
+                )
 
         # Note and Date fields - adjust row numbers
         note_row = medicine_row + 1
@@ -194,16 +217,19 @@ class UIManager:
         ttk.Label(input_frame, text="Note:").grid(
             row=note_row, column=0, sticky="w", padx=5, pady=2
         )
-        ttk.Entry(input_frame, textvariable=note_var).grid(
+        ttk.Entry(input_frame, textvariable=note_var, style="Modern.TEntry").grid(
             row=note_row, column=1, sticky="ew", padx=5, pady=2
         )
 
         ttk.Label(input_frame, text="Date (mm/dd/yyyy):").grid(
             row=date_row, column=0, sticky="w", padx=5, pady=2
         )
-        ttk.Entry(input_frame, textvariable=date_var, justify="center").grid(
-            row=date_row, column=1, sticky="ew", padx=5, pady=2
-        )
+        ttk.Entry(
+            input_frame,
+            textvariable=date_var,
+            justify="center",
+            style="Modern.TEntry",
+        ).grid(row=date_row, column=1, sticky="ew", padx=5, pady=2)
 
         # Set default date to today
         date_var.set(datetime.now().strftime("%m/%d/%Y"))
@@ -225,7 +251,7 @@ class UIManager:
     def create_table_frame(self, parent_frame: ttk.Frame) -> dict[str, Any]:
         """Create and configure the table frame with a treeview."""
         table_frame: ttk.LabelFrame = ttk.LabelFrame(
-            parent_frame, text="Log (Double-click to edit)"
+            parent_frame, text="Log (Double-click to edit)", style="Card.TLabelframe"
         )
         table_frame.grid(row=1, column=1, padx=10, pady=10, sticky="nsew")
 
@@ -258,7 +284,34 @@ class UIManager:
         col_labels.append("Note")
         col_settings.append(("Note", 300, "w"))
 
-        tree: ttk.Treeview = ttk.Treeview(table_frame, columns=columns, show="headings")
+        tree: ttk.Treeview = ttk.Treeview(
+            table_frame, columns=columns, show="headings", style="Modern.Treeview"
+        )
+
+        # Configure treeview selection behavior
+        tree.configure(selectmode="browse")  # Single selection mode
+
+        # Configure row tags for alternating colors
+        theme_colors = self.theme_manager.get_theme_colors()
+        tree.tag_configure("evenrow", background=theme_colors["bg"])
+        tree.tag_configure("oddrow", background=theme_colors["alt_bg"])
+
+        # Configure selection highlighting
+        tree.tag_configure(
+            "selected",
+            background=theme_colors["select_bg"],
+            foreground=theme_colors["select_fg"],
+        )
+
+        # Bind selection events to ensure proper highlighting
+        def on_selection_change(event):
+            """Handle treeview selection changes to ensure proper highlighting."""
+            selection = tree.selection()
+            if selection:
+                # Force focus to ensure selection is visible
+                tree.focus(selection[0])
+
+        tree.bind("<<TreeviewSelect>>", on_selection_change)
 
         for col, label in zip(columns, col_labels, strict=False):
             tree.heading(col, text=label)
@@ -277,7 +330,9 @@ class UIManager:
 
     def create_graph_frame(self, parent_frame: ttk.Frame) -> ttk.LabelFrame:
         """Create and configure the graph frame."""
-        graph_frame: ttk.LabelFrame = ttk.LabelFrame(parent_frame, text="Evolution")
+        graph_frame: ttk.LabelFrame = ttk.LabelFrame(
+            parent_frame, text="Evolution", style="Card.TLabelframe"
+        )
         graph_frame.grid(row=0, column=0, columnspan=2, padx=10, pady=10, sticky="nsew")
         return graph_frame
 
@@ -289,23 +344,40 @@ class UIManager:
         button_frame.grid(row=7, column=0, columnspan=2, pady=10)
 
         for btn_config in buttons_config:
-            ttk.Button(
+            button = ttk.Button(
                 button_frame,
                 text=btn_config["text"],
                 command=btn_config["command"],
-            ).pack(
+                style="Action.TButton",
+            )
+            button.pack(
                 side="left",
                 padx=5,
                 fill=btn_config.get("fill", None),
                 expand=btn_config.get("expand", False),
             )
 
+            # Add tooltips based on button text
+            button_text = btn_config["text"].lower()
+            if "add" in button_text or "save" in button_text:
+                self.tooltip_manager.add_button_tooltip(button, "save")
+            elif "quit" in button_text or "exit" in button_text:
+                self.tooltip_manager.add_button_tooltip(button, "quit")
+
         return button_frame
 
     def create_status_bar(self, parent_frame: tk.Widget) -> tk.Frame:
         """Create and configure the status bar at the bottom of the application."""
+        # Get theme colors for consistent styling
+        theme_colors = self.theme_manager.get_theme_colors()
+
         # Create the status bar frame
-        self.status_bar = tk.Frame(parent_frame, relief=tk.SUNKEN, bd=1)
+        self.status_bar = tk.Frame(
+            parent_frame,
+            relief=tk.SUNKEN,
+            bd=1,
+            bg=theme_colors["bg"],
+        )
         self.status_bar.grid(row=2, column=0, columnspan=2, sticky="ew", padx=5, pady=2)
 
         # Configure the parent to make the status bar stretch
@@ -319,6 +391,8 @@ class UIManager:
             font=("TkDefaultFont", 9),
             padx=10,
             pady=2,
+            bg=theme_colors["bg"],
+            fg=theme_colors["fg"],
         )
         self.status_label.pack(side=tk.LEFT, fill=tk.X, expand=True)
 
@@ -330,6 +404,8 @@ class UIManager:
             font=("TkDefaultFont", 9),
             padx=10,
             pady=2,
+            bg=theme_colors["bg"],
+            fg=theme_colors["fg"],
         )
         self.file_info_label.pack(side=tk.RIGHT)
 
@@ -793,9 +869,15 @@ class UIManager:
             variable=vars_dict[key],
             orient=tk.HORIZONTAL,
             length=250,
+            style="Modern.Horizontal.TScale",
         )
         scale.grid(row=0, column=1, sticky="ew")
 
+        # Add tooltip for the scale
+        pathology = self.pathology_manager.get_pathology(key)
+        if pathology:
+            self.tooltip_manager.add_scale_tooltip(scale, pathology.display_name)
+
         # Scale labels
         labels_frame = ttk.Frame(scale_container)
         labels_frame.grid(row=1, column=0, sticky="ew", pady=(5, 0))
diff --git a/uv.lock b/uv.lock
index 0c204c5..5ff29c2 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.13"
 
 [[package]]
@@ -767,6 +767,7 @@ dependencies = [
     { name = "pandas" },
     { name = "reportlab" },
     { name = "tk" },
+    { name = "ttkthemes" },
 ]
 
 [package.dev-dependencies]
@@ -789,6 +790,7 @@ requires-dist = [
     { name = "pandas", specifier = ">=2.3.1" },
     { name = "reportlab", specifier = ">=4.4.3" },
     { name = "tk", specifier = ">=0.1.0" },
+    { name = "ttkthemes", specifier = ">=3.2.2" },
 ]
 
 [package.metadata.requires-dev]
@@ -811,6 +813,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/1e/0b/029cbdb868bb555fed99bf6540fff072d500b3f895873709f25084e85e33/tk-0.1.0-py3-none-any.whl", hash = "sha256:703a69ff0d5ba2bd2f7440582ad10160e4a6561595d33457dc6caa79b9bf4930", size = 3879, upload-time = "2019-07-08T06:51:55.175Z" },
 ]
 
+[[package]]
+name = "ttkthemes"
+version = "3.2.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "pillow" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/fa/45/ab8ada55281af99a03bc0f8be53a502eb37ee34b94819a9ced89e8b0c12f/ttkthemes-3.2.2.tar.gz", hash = "sha256:01daed001f2ff0e4f32832a0d9ea48176c0c505203b030756bdde3bd1bcb21d2", size = 891159, upload-time = "2021-02-15T12:57:14.719Z" }
+
 [[package]]
 name = "tzdata"
 version = "2025.2"