poses: add night city lean against rail pose

data/poses/night_city_lean_against_rail.json

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+{
+  "id": "night_city_lean_against_rail",
+  "name": "Night City Lean Against Rail",
+  "standing": true,
+  "tags": ["urban", "night", "moody", "cinematic", "low-light", "street"],
+  "difficulty": "intermediate",
+  "tips": [
+    "Lean casually against the rail with weight on one leg",
+    "Keep shoulders relaxed, one shoulder slightly higher",
+    "Chin slightly up for confident look",
+    "Eyes can be soft or looking into distance",
+    "Hands in pockets or one hand on rail"
+  ],
+  "camera_cues": [
+    "Full body or three-quarter body shot",
+    "Use leading lines from rail",
+    "Capture city lights in background",
+    "Low angle for dramatic effect",
+    "Consider silhouette against city lights"
+  ],
+  "lighting": {
+    "type": "low-light",
+    "sources": ["city lights", "street lamps", "neon signs"],
+    "mood": "moody, cinematic, urban",
+    "tips": [
+      "Use wide aperture (f/1.8-2.8)",
+      "Increase ISO (800-3200)",
+      "Slow shutter speed for light trails",
+      "Consider off-camera flash for fill"
+    ]
+  },
+  "joints": {
+    "nose": [0.5, 0.12, 0.0],
+    "l_shoulder": [0.42, 0.28, 0.0],
+    "r_shoulder": [0.58, 0.28, 0.0],
+    "l_elbow": [0.38, 0.42, 0.0],
+    "r_elbow": [0.62, 0.42, 0.0],
+    "l_wrist": [0.35, 0.55, 0.0],
+    "r_wrist": [0.65, 0.55, 0.0],
+    "l_hip": [0.45, 0.55, 0.0],
+    "r_hip": [0.55, 0.55, 0.0],
+    "l_knee": [0.42, 0.72, 0.0],
+    "r_knee": [0.58, 0.72, 0.0],
+    "l_ankle": [0.40, 0.9, 0.0],
+    "r_ankle": [0.60, 0.9, 0.0]
+  },
+  "variations": [
+    {
+      "name": "hands_in_pockets",
+      "description": "Both hands in jacket pockets",
+      "joints_adjustment": {
+        "l_wrist": [0.42, 0.52, 0.0],
+        "r_wrist": [0.58, 0.52, 0.0]
+      }
+    },
+    {
+      "name": "one_hand_on_rail",
+      "description": "One hand resting on rail behind",
+      "joints_adjustment": {
+        "r_wrist": [0.72, 0.48, 0.0]
+      }
+    }
+  ],
+  "best_for": [
+    "Street photography",
+    "Urban portraits",
+    "Night photography",
+    "Cinematic shots",
+    "Fashion editorials"
+  ],
+  "avoid": [
+    "Overly posed looks",
+    "Stiff posture",
+    "Looking directly at camera (unless intended)"
+  ]
+}

docs/DIFFICULTY_LEVELS_GUIDE.md

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+# Difficulty Levels Guide for Pose Packs
+
+## Overview
+
+This guide defines the difficulty levels for pose packs in PoseGuide, helping users choose appropriate poses for their skill level.
+
+## Difficulty Levels
+
+### Beginner (⭐)
+**Target Audience**: New users, casual creators
+**Time to Complete**: 5-15 minutes
+**Complexity**: Simple, straightforward poses
+
+#### Characteristics
+- Minimal body positioning required
+- Common, natural poses
+- Limited technical knowledge needed
+- Basic camera angles
+
+#### Example Poses
+- Standing neutral
+- Sitting on chair
+- Walking forward
+- Simple hand gestures
+
+#### Tips for Beginners
+- Start with basic standing poses
+- Focus on natural body alignment
+- Use reference images for guidance
+- Don't rush - take your time
+
+---
+
+### Intermediate (⭐⭐)
+**Target Audience**: Regular users, hobbyists
+**Time to Complete**: 15-30 minutes
+**Complexity**: Moderate complexity
+
+#### Characteristics
+- Multiple body parts positioning
+- Dynamic poses with movement
+- Some technical knowledge helpful
+- Varied camera angles
+
+#### Example Poses
+- Dance moves
+- Action poses (running, jumping)
+- Social interactions (handshake, hug)
+- Professional poses (presentation, demo)
+
+#### Tips for Intermediate
+- Practice body proportion consistency
+- Pay attention to weight distribution
+- Use reference videos for dynamic poses
+- Experiment with different angles
+
+---
+
+### Advanced (⭐⭐⭐)
+**Target Audience**: Experienced users, professionals
+**Time to Complete**: 30-60 minutes
+**Complexity**: Complex, detailed poses
+
+#### Characteristics
+- intricate body positioning
+- Complex interactions with objects
+- Technical knowledge required
+- Professional camera work
+
+#### Example Poses
+- Complex dance choreography
+- Athletic activities (gymnastics, martial arts)
+- Group interactions (multiple characters)
+- Dramatic/emotional expressions
+
+#### Tips for Advanced
+- Study anatomy and body mechanics
+- Use motion capture references
+- Pay attention to finger positioning
+- Practice complex weight shifts
+
+---
+
+### Expert (⭐⭐⭐⭐)
+**Target Audience**: Professionals, artists
+**Time to Complete**: 60+ minutes
+**Complexity**: Highly complex, artistic
+
+#### Characteristics
+- Artistic, expressive poses
+- Complex object interactions
+- Deep technical expertise needed
+- Cinematic camera work
+
+#### Example Poses
+- Artistic dance performances
+- Martial arts sequences
+- Complex emotional scenes
+- Character-driven narratives
+
+#### Tips for Expert
+- Study professional references
+- Understand body language psychology
+- Master weight and balance
+- Create compelling narratives
+
+---
+
+### Master (⭐⭐⭐⭐⭐)
+**Target Audience**: Masters, educators
+**Time to Complete**: Variable
+**Complexity**: Artistic mastery
+
+#### Characteristics
+- Unique, signature poses
+- Innovative body language
+- Teaching/educational focus
+- Pushing creative boundaries
+
+#### Example Poses
+- Signature style poses
+- Educational demonstrations
+- Experimental art poses
+- Cultural/traditional poses
+
+#### Tips for Master
+- Develop your unique style
+- Teach others your techniques
+- Push creative boundaries
+- Preserve cultural poses
+
+---
+
+## Pose Pack Classification
+
+### By Difficulty
+| Difficulty | Pack Size | Use Case |
+|------------|-----------|----------|
+| Beginner | 5-10 poses | Quick projects, learning |
+| Intermediate | 10-20 poses | Regular projects, social media |
+| Advanced | 20-50 poses | Professional projects |
+| Expert | 50-100 poses | Artistic projects |
+| Master | 100+ poses | Comprehensive collections |
+
+### By Category
+| Category | Typical Difficulty |
+|----------|-------------------|
+| Standing | Beginner |
+| Sitting | Beginner |
+| Walking | Intermediate |
+| Dancing | Advanced |
+| Athletics | Advanced |
+| Emotional | Expert |
+| Cultural | Master |
+
+## Usage Guidelines
+
+### For Users
+1. **Start Simple**: Begin with beginner poses
+2. **Progress Gradually**: Move to intermediate as you improve
+3. **Practice Regularly**: Consistent practice improves skills
+4. **Use References**: Always use reference images/videos
+
+### For Creators
+1. **Label Clearly**: Mark difficulty on all poses
+2. **Provide Instructions**: Include step-by-step guidance
+3. **Offer Variations**: Provide easier/harder variations
+4. **Include References**: Add reference images
+
+## Quality Standards
+
+### Beginner Poses
+- ✅ Clear, simple instructions
+- ✅ Common, recognizable poses
+- ✅ Minimal technical requirements
+- ✅ Good for learning
+
+### Intermediate Poses
+- ✅ Detailed positioning guides
+- ✅ Dynamic movement included
+- ✅ Multiple camera angles
+- ✅ Good for regular use
+
+### Advanced Poses
+- ✅ Professional quality
+- ✅ Complex interactions
+- ✅ Technical precision
+- ✅ Good for professional work
+
+### Expert Poses
+- ✅ Artistic expression
+- ✅ Innovative techniques
+- ✅ Deep technical detail
+- ✅ Good for artistic projects
+
+### Master Poses
+- ✅ Unique, signature style
+- ✅ Educational value
+- ✅ Cultural significance
+- ✅ Good for teaching/learning
+
+## References
+
+- [Pose Estimation Basics](https://example.com/pose-estimation)
+- [Body Language Guide](https://example.com/body-language)
+- [Character Animation Principles](https://example.com/animation-principles)