Add comprehensive ChatGPT-style document theme optimized for modern interactive content: **Theme Features:** - Inter font family for clean, modern sans-serif typography - Compact 580px width for chat-like reading experience - High contrast (#1f1f1f text on white background) - ChatGPT signature green (#10a37f) accent color - Tight 1.5 line height for efficient information density - Modern 8px border radius for contemporary feel - Optimized code block styling with proper monospace fonts **Technical Implementation:** - Added 'chatgpt' theme to LAYERED_THEMES system (document scope) - Full backward compatibility with TEMPLATE_STYLES and LEGACY_THEME_MAPPING - CLI integration: `markitect md-render --theme chatgpt` - Proper theme layering support (combines with light/dark modes) **Quality Assurance:** - Comprehensive 9-test suite covering all functionality (9/9 passing) - Verified HTML generation and CSS styling - Tested CLI integration and theme combinations - Full compatibility with existing theme architecture Successfully closes Issue #165 with compact, readable layout optimized for interactive content following ChatGPT's interface design principles. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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