🗺️ Black Trigram (흑괘) - Comprehensive Game Design Document

🔐 ISMS Alignment: This document follows Hack23 Secure Development Policy for design documentation requirements.

Version: 2.1 (Updated January 29, 2026)
Status: Q1 2026 Combat Realism Production-Ready (13/13 systems complete, 100%)
Target Release: v1.0 - Q2 2026

📚 Documentation Cross-References

This comprehensive game design document is supported by detailed technical architecture documentation:

COMBAT_ARCHITECTURE.md - Complete combat system technical implementation (2,416 lines)
FUTURE_ARCHITECTURE.md - Evolutionary roadmap and v2.0+ vision (2,021 lines)
game-status.md - Current implementation metrics and Q1 2026 progress (2,168 lines)
ARCHITECTURE.md - C4 model system architecture
README.md - Project overview and quick start guide

Korean Terminology Consistency: All sections use consistent Korean-English bilingual terminology as defined in COMBAT_ARCHITECTURE.md.

Executive Summary

Black Trigram (흑괘) is a realistic 3D precision combat game inspired by classic martial arts fighters like Budokan: The Martial Spirit and International Karate+, reimagined with authentic Korean martial arts and modern combat techniques. Players master traditional vital point striking through precise, physics-based combat that emphasizes anatomical targeting and one-strike effectiveness.

Core Pillars

정격자 (Jeonggyeokja) - Precision Striker: Every strike targets anatomical vulnerabilities
비수 (Bisu) - Lethal Technique: Realistic application of traditional martial arts
암살자 (Amsalja) - Combat Specialist: Focus on immediate incapacitation
급소격 (Geupsogyeok) - Vital Point Strike: Authentic pressure point combat

Game Overview

Genre

3D Realistic Combat Simulator / Traditional Korean Martial Arts Training

Platform

Web-based (HTML5/WebGL via Three.js + @react-three/fiber) optimized for authentic 60fps combat physics

Technology Stack

Frontend: React 19, TypeScript (strict mode), Three.js, @react-three/fiber, @react-three/drei
Audio: Howler.js with spatial audio support for realistic combat sounds
Testing: Vitest (unit), Cypress (E2E), 76% overall test coverage
Fonts: Noto Sans KR for authentic Korean typography
Performance: 60fps target on desktop, 55fps+ on mobile

Target Audience

Fans of realistic combat simulation (Budokan, IK+, Way of the Exploding Fist)
Martial arts practitioners seeking authentic technique knowledge
Players interested in traditional Korean martial arts techniques (태권도, 합기도, 택견)
Combat enthusiasts wanting precision-based gameplay with anatomical accuracy

Unique Selling Points

Realistic Combat Physics - Real body mechanics with authentic combat focus, 13 realism systems (100% complete)
Anatomical Precision - 70 actual vital points (급소) with Korean names and TCM meridian mapping
Combat Realism - Pain response, consciousness levels, breathing disruption, trauma visualization, grappling, counter-attacks
AI Counter-Attacks - Intelligent opponent AI that exploits limb exposure and vulnerability windows
Grappling System - Authentic Hapkido/Ssireum techniques with grip mechanics and escape systems
Korean Martial Arts - Based on traditional techniques (Taekwondo, Hapkido, Taekyon, Yusul) and philosophy (I Ching)
Traditional Knowledge - Teaches actual pressure points, anatomical effects, and martial arts applications
8 Trigram Stances (팔괘) - Authentic Korean martial arts stances based on I Ching philosophy
Cultural Authenticity - Korean-English bilingual UI, traditional instruments (가야금, 장구), cyberpunk aesthetic

70 Vital Points System (급소 체계)
8 Trigram Stances (팔괘 자세)
5 Player Archetypes (오대 무사)
Skeletal Animation System (골격 애니메이션)
Future Multiplayer Modes (멀티플레이어)
Backend-Enabled Progression (진행 시스템)
Monetization Strategy (수익화 전략)
Balance Philosophy (밸런스 철학)
Realistic Combat System
Game Modes & Training
Technical Implementation
Cultural Integration

1. 70 Vital Points System (급소 체계)

Current Status: ✅ 100% Complete (70/70 points documented)
Documentation: docs/vital-points/, COMBAT_ARCHITECTURE.md
Test Coverage: 57 tests passing, 100% data validation

The vital point system is the cornerstone of Black Trigram's combat realism, implementing 70 authentic anatomical targets derived from Korean martial arts (급소격, Geupsogyeok), Traditional Chinese Medicine (TCM) meridians, and modern anatomy.

1.1 System Overview

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graph TB
    subgraph "🎯 70 Vital Points System (급소 체계)"
        VPS["⚡ VitalPointSystem<br/>70 Targets"]:::vital
        VPS --> HEAD["🧠 머리 Head<br/>12 points<br/>Critical Targets"]:::head
        VPS --> TORSO["💓 몸통 Torso<br/>24 points<br/>Organ Zones"]:::torso
        VPS --> ARMS["💪 팔 Arms<br/>17 points<br/>Joint Locks"]:::arms
        VPS --> LEGS["🦵 다리 Legs<br/>17 points<br/>Mobility Disablers"]:::legs
    end

    subgraph "📊 Classification Systems"
        SEV["⚠️ Severity Levels<br/>5 categories<br/>Lethal→Minor"]:::severity
        CAT["🔬 Anatomical Categories<br/>7 types<br/>System-Based"]:::category
        MER["🌊 TCM Meridians<br/>14 channels<br/>Energy Flow"]:::meridian
    end

    VPS -.->|"Categorized by"| SEV
    VPS -.->|"Mapped to"| CAT
    VPS -.->|"Aligned with"| MER

    classDef vital fill:#ff4444,stroke:#990000,color:#fff,stroke-width:3px,rx:10
    classDef head fill:#ff0000,stroke:#cc0000,color:#fff,stroke-width:2px,rx:8
    classDef torso fill:#ff8800,stroke:#cc6600,color:#fff,stroke-width:2px,rx:8
    classDef arms fill:#00cc66,stroke:#009944,color:#fff,stroke-width:2px,rx:8
    classDef legs fill:#0099ff,stroke:#0066cc,color:#fff,stroke-width:2px,rx:8
    classDef severity fill:#9933ff,stroke:#6600cc,color:#fff,stroke-width:2px,rx:8
    classDef category fill:#00cc44,stroke:#009933,color:#fff,stroke-width:2px,rx:8
    classDef meridian fill:#ffcc00,stroke:#cc9900,color:#000,stroke-width:2px,rx:8

1.2 Regional Distribution

Region	Korean	Count	Icon	Examples
Head 🧠	머리	12	🎯	백회혈 (Baihui), 인영 (Renying), 태양혈 (Taiyang)
Torso 💓	몸통	24	⚡	명문 (Mingmen), 삼초수 (Sanjiaoshu), 심장혈 (Heart Point)
Arms 💪	팔	17	🔨	대추 (Dazhui), 건우 (Jianyu), 곡지 (Quchi)
Legs 🦵	다리	17	⚔️	슬관절 (Knee Joint), 환도 (Huantiao), 족삼리 (Zusanli)
TOTAL		70	🎯	All anatomical targets mapped

1.3 Severity Classification

Vital points are classified into 5 severity levels based on potential combat effectiveness:

Level	Korean	Count	Icon	Damage Range	Duration	Combat Effect
Lethal ☠️	치명적	4	💀	80-100	Permanent	Instant KO, life-threatening
Critical ⚠️	극심	18	🔴	60-80	30-60s	Severe pain, loss of consciousness
Major ⚡	중대	28	🟠	40-60	20-40s	Intense pain, significant impairment
Moderate 🟡	중등	16	🟡	20-40	10-20s	Moderate pain, temporary weakness
Minor 🟢	경미	4	🟢	10-20	5-10s	Mild pain, brief distraction

1.4 Anatomical Categories

Vital points are categorized by anatomical system affected:

Category	Korean	Count	Icon	Primary Effect	Examples
Neurological 🧠	신경계	22	⚡	Nerve damage, paralysis	Temples (太阳), Vagus nerve
Skeletal 🦴	골격계	15	💥	Bone fractures, structural damage	Ribs, Clavicle, Nasal bone
Joint 🔗	관절	12	🔨	Dislocation, mobility loss	Elbow, Knee, Shoulder
Organ 💓	장기	9	🎯	Internal damage, organ trauma	Liver, Spleen, Kidneys
Muscular 💪	근육	7	💢	Muscle tear, spasm	Biceps, Quadriceps
Vascular 🩸	혈관	3	🔴	Blood flow disruption	Carotid, Femoral
Respiratory 🫁	호흡기	2	💨	Breathing disruption	Solar plexus, Throat

1.5 Complete 70 Vital Points Database

1.5.1 Head Region (머리) - 12 Points

#	Korean Name	English/TCM	Location	Severity	Effect	Damage	Duration	Category	Meridian
1	백회혈	Baihui (GV20)	Crown of head	Critical	Consciousness loss, dizziness	70	45s	Neurological	Governor Vessel
2	인영	Renying (ST9)	Carotid artery	Lethal	Blood flow disruption, KO	95	60s	Vascular	Stomach
3	태양혈	Taiyang (EX-HN5)	Temple	Critical	Severe pain, vision disruption	75	50s	Neurological	Extra Point
4	풍지	Fengchi (GB20)	Base of skull	Critical	Balance loss, nausea	65	40s	Neurological	Gallbladder
5	예풍	Yifeng (TE17)	Behind earlobe	Major	Equilibrium disruption	55	30s	Neurological	Triple Energizer
6	아문	Yamen (GV15)	Upper cervical spine	Lethal	Spinal cord trauma, paralysis	90	Permanent	Neurological	Governor Vessel
7	인중	Renzhong (GV26)	Philtrum	Major	Extreme pain, tear response	50	25s	Neurological	Governor Vessel
8	협거	Jiache (ST6)	Jaw hinge	Major	Jaw dislocation, speech loss	45	20s	Skeletal	Stomach
9	승장	Chengjiang (CV24)	Chin point	Moderate	Pain, head snap	35	15s	Skeletal	Conception Vessel
10	비골	Nasal Bone	Bridge of nose	Major	Bone fracture, vision blur	50	30s	Skeletal	-
11	안와	Orbital Ridge	Eye socket rim	Critical	Orbital fracture, vision loss	65	40s	Skeletal	-
12	경동맥	Carotid Sinus	Side of neck	Lethal	Immediate unconsciousness	100	60s	Vascular	-

1.5.2 Torso Region (몸통) - 24 Points

#	Korean Name	English/TCM	Location	Severity	Effect	Damage	Duration	Category	Meridian
13	천돌	Tiantu (CV22)	Suprasternal notch	Critical	Breathing disruption, choking	75	45s	Respiratory	Conception Vessel
14	결분	Quepen (ST12)	Clavicle notch	Major	Collarbone fracture	55	30s	Skeletal	Stomach
15	쇄골	Clavicle	Collarbone	Major	Bone fracture, arm weakness	50	35s	Skeletal	-
16	견우	Jianyu (LI15)	Shoulder cap	Major	Shoulder dislocation	45	25s	Joint	Large Intestine
17	극상근	Supraspinatus	Shoulder blade top	Moderate	Arm lifting impairment	30	15s	Muscular	-
18	대추	Dazhui (GV14)	C7-T1 vertebrae	Critical	Spinal trauma, arm numbness	70	50s	Neurological	Governor Vessel
19	명문	Mingmen (GV4)	L2-L3 spine	Lethal	Kidney damage, leg paralysis	85	60s	Organ	Governor Vessel
20	삼초수	Sanjiaoshu (BL22)	Lower back lateral	Major	Kidney strike, organ pain	50	30s	Organ	Bladder
21	심장혈	Heart Point	Left chest (5th rib)	Critical	Cardiac disruption, arrhythmia	80	55s	Organ	-
22	중완	Zhongwan (CV12)	Solar plexus	Critical	Breathing paralysis, diaphragm	75	40s	Respiratory	Conception Vessel
23	간유	Ganshu (BL18)	Right mid-back	Major	Liver strike, internal bleeding	55	35s	Organ	Bladder
24	비유	Pishu (BL20)	Left mid-back	Major	Spleen damage	50	30s	Organ	Bladder
25	신유	Shenshu (BL23)	Lower back	Major	Kidney trauma	55	35s	Organ	Bladder
26	늑골	Floating Ribs	11th-12th ribs	Major	Rib fracture, internal damage	50	30s	Skeletal	-
27	늑간신경	Intercostal Nerve	Between ribs	Major	Severe pain, breathing difficulty	45	25s	Neurological	-
28	대장수	Dachangshu (BL25)	Lower back	Moderate	Intestinal disruption	35	20s	Organ	Bladder
29	단전	Dantian (CV6)	Lower abdomen	Moderate	Core weakness, balance loss	30	15s	Muscular	Conception Vessel
30	기해	Qihai (CV6)	Lower abdomen	Moderate	Energy disruption	35	20s	Muscular	Conception Vessel
31	관원	Guanyuan (CV4)	Lower abdomen	Moderate	Pelvic pain	30	15s	Organ	Conception Vessel
32	천추	Coccyx	Tailbone	Major	Spinal pain, sitting inability	50	40s	Skeletal	-
33	요추	Lumbar Spine	L1-L5	Critical	Lower body paralysis risk	65	45s	Neurological	-
34	흉골	Sternum	Breastbone center	Major	Cardiac shock, rib damage	50	30s	Skeletal	-
35	검상돌기	Xiphoid Process	Bottom of sternum	Major	Internal organ damage	55	35s	Organ	-
36	겨드랑이	Axillary Nerve	Armpit	Moderate	Arm numbness, weakness	35	20s	Neurological	-

1.5.3 Arms Region (팔) - 17 Points

#	Korean Name	English/TCM	Location	Severity	Effect	Damage	Duration	Category	Meridian
37	견정	Jianjing (GB21)	Shoulder trapezius	Major	Arm weakness, pain	50	30s	Muscular	Gallbladder
38	견우	Jianyu (LI15)	Shoulder deltoid	Major	Shoulder dislocation	45	25s	Joint	Large Intestine
39	극문	Jimen (SP11)	Inner biceps	Moderate	Arm weakness	35	20s	Muscular	Spleen
40	곡지	Quchi (LI11)	Elbow crease	Major	Elbow hyperextension	50	30s	Joint	Large Intestine
41	주골	Elbow Point	Ulnar nerve (funny bone)	Major	Electric pain, hand numbness	55	35s	Neurological	-
42	수삼리	Shousanli (LI10)	Forearm	Moderate	Grip weakness	30	15s	Muscular	Large Intestine
43	외관	Waiguan (TE5)	Outer forearm	Moderate	Wrist pain, mobility loss	35	20s	Neurological	Triple Energizer
44	내관	Neiguan (PC6)	Inner forearm	Moderate	Nausea, wrist weakness	30	15s	Neurological	Pericardium
45	신문	Shenmen (HT7)	Wrist crease	Moderate	Hand numbness	25	12s	Neurological	Heart
46	양계	Yangxi (LI5)	Wrist thumb side	Moderate	Thumb weakness	25	12s	Joint	Large Intestine
47	합곡	Hegu (LI4)	Hand web (thumb-index)	Major	Severe hand pain	40	25s	Neurological	Large Intestine
48	손가락관절	Finger Joints	All finger joints	Minor	Dislocation, mobility loss	20	10s	Joint	-
49	손등	Back of Hand	Metacarpal bones	Moderate	Hand fracture, grip loss	35	20s	Skeletal	-
50	손목	Wrist	Radial/ulnar joint	Major	Wrist fracture, hand useless	45	30s	Joint	-
51	팔꿈치	Elbow Joint	Humeroulnar joint	Major	Elbow dislocation	50	35s	Joint	-
52	상완이두근	Biceps Belly	Upper arm front	Moderate	Muscle tear, arm weakness	30	20s	Muscular	-
53	상완삼두근	Triceps Tendon	Upper arm back	Moderate	Elbow extension loss	30	20s	Muscular	-

1.5.4 Legs Region (다리) - 17 Points

#	Korean Name	English/TCM	Location	Severity	Effect	Damage	Duration	Category	Meridian
54	환도	Huantiao (GB30)	Hip joint	Major	Hip dislocation, leg weakness	50	30s	Joint	Gallbladder
55	풍시	Fengshi (GB31)	Outer thigh	Moderate	Leg numbness	35	20s	Neurological	Gallbladder
56	혈해	Xuehai (SP10)	Inner thigh	Moderate	Leg circulation disruption	30	15s	Vascular	Spleen
57	대퇴사두근	Quadriceps	Front thigh	Moderate	Leg buckling, kicking loss	35	25s	Muscular	-
58	슬관절	Knee Joint	Kneecap	Major	Knee dislocation, walking loss	55	40s	Joint	-
59	슬개골	Patella	Kneecap bone	Major	Kneecap fracture	50	35s	Skeletal	-
60	족삼리	Zusanli (ST36)	Below knee (outer)	Major	Leg strength loss, balance	45	30s	Neurological	Stomach
61	양릉천	Yanglingquan (GB34)	Outer knee	Major	Leg paralysis	50	35s	Neurological	Gallbladder
62	음릉천	Yinlingquan (SP9)	Inner knee	Moderate	Knee pain, mobility loss	35	25s	Neurological	Spleen
63	승산	Chengshan (BL57)	Calf belly	Moderate	Calf cramp, Achilles strain	30	20s	Muscular	Bladder
64	곤륜	Kunlun (BL60)	Ankle (outer)	Major	Ankle sprain, walking loss	45	30s	Joint	Bladder
65	태계	Taixi (KI3)	Ankle (inner)	Moderate	Ankle pain, balance loss	35	25s	Joint	Kidney
66	용천	Yongquan (KI1)	Sole of foot	Moderate	Foot pain, standing difficulty	30	20s	Neurological	Kidney
67	대퇴골	Femur	Thigh bone	Critical	Leg fracture, immobilization	70	60s	Skeletal	-
68	경골	Tibia	Shin bone	Major	Shin fracture, leg collapse	55	40s	Skeletal	-
69	비골	Fibula	Outer lower leg bone	Major	Leg fracture, instability	50	35s	Skeletal	-
70	아킬레스건	Achilles Tendon	Back of ankle	Critical	Tendon rupture, mobility loss	65	50s	Muscular	-

1.6 Damage Calculation Formula

Vital point damage is calculated using a comprehensive formula that accounts for base damage, archetype modifiers, stance synergies, and combat situational factors:

TotalDamage = BaseDamage × ArchetypeModifier × StanceModifier × CriticalBonus × VulnerabilityFactor

Where:
  BaseDamage = Vital point base damage value (10-100)
  ArchetypeModifier = Attacker archetype bonus (0.8x - 1.5x)
  StanceModifier = Stance vs vital point synergy (0.7x - 1.3x)
  CriticalBonus = Critical hit multiplier (1.0x normal, 1.5x critical, 2.0x perfect)
  VulnerabilityFactor = Defender state (0.5x READY, 0.8x SHAKEN, 1.2x VULNERABLE, 2.0x HELPLESS)

Example Calculations

Example 1: Musa (무사) Striking Baihui (백회혈) with Geon Stance

BaseDamage = 70 (Baihui Critical severity)
ArchetypeModifier = 1.2 (Musa bonus for bone-breaking techniques)
StanceModifier = 1.3 (Geon stance optimal for overhead strikes)
CriticalBonus = 1.5 (Critical hit landed)
VulnerabilityFactor = 1.2 (Defender in VULNERABLE state)

TotalDamage = 70 × 1.2 × 1.3 × 1.5 × 1.2 = 196 damage

Effect: Instant consciousness loss, 45-second stun, severe balance disruption

Example 2: Amsalja (암살자) Striking Carotid Artery (인영) with Son Stance

BaseDamage = 95 (Renying Lethal severity)
ArchetypeModifier = 1.5 (Amsalja specializes in silent takedowns)
StanceModifier = 1.2 (Son stance for pressure point precision)
CriticalBonus = 2.0 (Perfect strike, one-hit KO potential)
VulnerabilityFactor = 2.0 (Defender in HELPLESS state)

TotalDamage = 95 × 1.5 × 1.2 × 2.0 × 2.0 = 684 damage

Effect: Immediate KO, blood flow disruption, 60-second incapacitation, potential fatality

1.7 TCM Meridian Integration

All 70 vital points are mapped to the 14 Traditional Chinese Medicine (TCM) meridians, providing authentic martial arts context:

Meridian	Korean	Points	Key Effects
Governor Vessel (GV)	독맥	6	Spinal trauma, consciousness, paralysis
Conception Vessel (CV)	임맥	5	Breathing, core strength, organ damage
Lung (LU)	폐경	2	Respiratory distress, chest pain
Large Intestine (LI)	대장경	5	Arm weakness, hand numbness, severe pain
Stomach (ST)	위경	4	Jaw trauma, leg strength, balance
Spleen (SP)	비경	4	Leg circulation, internal bleeding
Heart (HT)	심경	1	Hand numbness, cardiac rhythm
Small Intestine (SI)	소장경	1	Shoulder pain, neck trauma
Bladder (BL)	방광경	8	Organ strikes, kidney damage, leg paralysis
Kidney (KI)	신경	2	Foot pain, ankle stability, energy
Pericardium (PC)	심포경	1	Nausea, wrist weakness
Triple Energizer (TE)	삼초경	2	Equilibrium, wrist pain
Gallbladder (GB)	담경	5	Head trauma, hip dislocation, leg paralysis
Liver (LV)	간경	1	Internal organ damage

1.8 Combat Application Examples

Scenario 1: Defensive Counter-Strike

Setup: Hacker (해커) defends against Musa (무사) heavy attack, seeks precise counter.

Action: Li Stance (☲) → Target "Quchi (곡지)" elbow crease → Critical hit

Calculation:

BaseDamage = 50 (Quchi Major severity)
ArchetypeModifier = 1.3 (Hacker's data-driven precision)
StanceModifier = 1.3 (Li stance optimal for precision strikes)
CriticalBonus = 1.5 (Critical hit)
VulnerabilityFactor = 1.2 (Musa exposed during attack)

TotalDamage = 50 × 1.3 × 1.3 × 1.5 × 1.2 = 152 damage

Effect: Elbow hyperextension, 30-second arm uselessness, attack interrupted

Scenario 2: Stealth Assassination

Setup: Amsalja (암살자) approaches unaware opponent from behind.

Action: Son Stance (☴) → Target "Mingmen (명문)" kidney strike → Perfect strike

Calculation:

BaseDamage = 85 (Mingmen Lethal severity)
ArchetypeModifier = 1.5 (Amsalja silent takedown specialist)
StanceModifier = 1.2 (Son stance for sustained pressure)
CriticalBonus = 2.0 (Perfect undetected strike)
VulnerabilityFactor = 2.0 (Opponent HELPLESS/unaware)

TotalDamage = 85 × 1.5 × 1.2 × 2.0 × 2.0 = 612 damage

Effect: Instant kidney damage, leg paralysis, 60-second incapacitation, potential fatality

1.9 Implementation Status

Data Structure: src/data/vitalPoints.ts - Complete 70-point database
Components:

VitalPointMarkers3D.tsx - 3D visualization with Three.js
VitalPointOverlayControls.tsx (673 lines) - Filtering UI, severity/region/search
AnatomicalRegionDetection.ts - Polygon-based zone detection (<0.01ms per check)

Features:

✅ Real-time filtering (severity, region, keyword search)
✅ Display options (labels on/off, animations, scale 0.5x-2.0x)
✅ Color-coded by severity (Lethal: red, Critical: orange, Major: yellow)
✅ Hover tooltips with full details (Korean name, effect, damage, duration)
✅ Keyboard shortcut: V to toggle vital point overlay

Performance: <0.01ms per collision check, 100x faster than required, maintains 60fps with all 70 points active

References: 127 medical and martial arts sources cited in docs/vital-points/VITAL_POINTS_REFERENCE.md

2. 8 Trigram Stances (팔괘 자세)

Current Status: ✅ 100% Complete (8/8 stances implemented)
Documentation: COMBAT_ARCHITECTURE.md
Test Coverage: 104 tests passing (Guard Poses), 100% stance transitions

The 8 Trigram Stance System (팔괘 자세) is the foundation of Black Trigram's combat philosophy, blending authentic Korean martial arts stances (Taekwondo 서기) with I Ching (주역) elemental philosophy. Each stance represents a natural force with unique combat bonuses, penalties, and philosophical meanings.

2.1 Stance Overview

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graph TB
    subgraph "☯️ Eight Trigram Stances (팔괘 자세)"
        G["☰ 건 Geon<br/>⛅ Heaven/Sky<br/>💪 Power: +20%"]:::geon
        T["☱ 태 Tae<br/>🌊 Lake/Marsh<br/>🤝 Throws: +20%"]:::tae
        L["☲ 리 Li<br/>🔥 Fire/Flame<br/>🎯 Precision: +15%"]:::li
        J["☳ 진 Jin<br/>⚡ Thunder/Shake<br/>💥 Shock: +15%"]:::jin
        S["☴ 손 Son<br/>💨 Wind/Wood<br/>⚔️ Combo: +10%"]:::son
        GA["☵ 감 Gam<br/>💧 Water/Abyss<br/>🔄 Counter: +10%"]:::gam
        GN["☶ 간 Gan<br/>⛰️ Mountain/Keep<br/>🛡️ Defense: +50%"]:::gan
        GO["☷ 곤 Gon<br/>🌍 Earth/Field<br/>🥋 Grapple: +40%"]:::gon
    end

    subgraph "⚖️ Rock-Paper-Scissors Balance System"
        RPS["🎮 Stance Counter<br/>Triangle System"]:::balance
        RPS -.->|"Dominates"| POWER["💪 Power Stances<br/>건/진/곤<br/>Bone Breaking"]:::power
        RPS -.->|"Precision"| PRECISION["🎯 Technical Stances<br/>리/손/간<br/>Vital Points"]:::precision
        RPS -.->|"Adapts"| FLOW["🌊 Flow Stances<br/>태/감<br/>Redirection"]:::flow
    end

    G & J & GO -.->|"Power"| POWER
    L & S & GN -.->|"Technique"| PRECISION
    T & GA -.->|"Flow"| FLOW

    POWER -->|"Overpowers"| FLOW
    FLOW -->|"Redirects"| PRECISION
    PRECISION -->|"Exploits"| POWER

    classDef geon fill:#ffcc00,stroke:#cc9900,color:#000,stroke-width:3px,rx:10
    classDef tae fill:#00ccff,stroke:#0099cc,color:#fff,stroke-width:3px,rx:10
    classDef li fill:#ff4400,stroke:#cc3300,color:#fff,stroke-width:3px,rx:10
    classDef jin fill:#9933ff,stroke:#6600cc,color:#fff,stroke-width:3px,rx:10
    classDef son fill:#00ff66,stroke:#00cc44,color:#000,stroke-width:3px,rx:10
    classDef gam fill:#0066ff,stroke:#0044cc,color:#fff,stroke-width:3px,rx:10
    classDef gan fill:#996633,stroke:#663300,color:#fff,stroke-width:3px,rx:10
    classDef gon fill:#553311,stroke:#332200,color:#fff,stroke-width:3px,rx:10
    classDef balance fill:#222,stroke:#ffcc00,color:#ffcc00,stroke-width:3px,rx:10
    classDef power fill:#ff4444,stroke:#cc0000,color:#fff,stroke-width:2px,rx:8
    classDef precision fill:#00cc44,stroke:#009933,color:#fff,stroke-width:2px,rx:8
    classDef flow fill:#0099ff,stroke:#0066cc,color:#fff,stroke-width:2px,rx:8

2.2 Detailed Stance Specifications

2.2.1 ☰ 건 (Geon) - Heaven/Sky

Korean Martial Arts Basis: 앞서기 (Ap Seogi - Walking Stance)
Philosophy: "창조의 힘" - Creative force, direct yang energy, overwhelming power
Combat Style: Aggressive forward stance emphasizing bone-breaking strikes and structural damage
Weight Distribution: 60% forward, 40% back (offensive positioning)

Bonuses:

+20% Damage to skeletal vital points (skull, ribs, clavicle, bones)
+15% Critical Hit Chance on overhead strikes
+10% Resistance to counter-attacks during forward strikes

Penalties:

-15% Mobility (slower lateral movement)
-10% Defense against leg sweeps and low attacks

Best Vital Points to Target:

백회혈 (Baihui) - Crown strike for consciousness loss
대추 (Dazhui) - Spine strike for nerve damage
쇄골 (Clavicle) - Bone-breaking shoulder strike
흉골 (Sternum) - Chest strike for cardiac shock

Signature Techniques:

천공격 (Heaven Strike): Overhead hammer fist to crown (백회혈)
골절권 (Bone Breaking Fist): Direct clavicle strike (쇄골)
천둥낙하 (Thunder Drop): Downward elbow to spine (대추)

Combo Example:

건 (Geon) Stance → Forward Step → 백회혈 (Baihui) Strike (70 base × 1.3 stance = 91 damage)
→ Follow-up: 대추 (Dazhui) Elbow (70 base × 1.3 stance = 91 damage)
→ Total: 182 damage + 2 consciousness hits = High KO probability

Effective Against: ☴ Son (Wind), ☵ Gam (Water) - Overpowers flow stances
Weak Against: ☷ Gon (Earth), ☶ Gan (Mountain) - Grounding counters aggression

2.2.2 ☱ 태 (Tae) - Lake/Marsh

Korean Martial Arts Basis: 앞굽이 (Ap Koobi Seogi - Front Stance)
Philosophy: "기쁨의 흐름" - Joyful flow, adaptability, redirection energy
Combat Style: Fluid mid-guard for joint locks, throws, and grappling redirection
Weight Distribution: 60% forward, 40% back (throwing leverage)

Bonuses:

+15% Reach for joint manipulation techniques
+20% Throw Success Rate (joint locks, hip throws)
+10% Counter Damage when redirecting attacks

Penalties:

-10% Direct Strike Damage (not optimized for punching)
-5% Speed (setup time for throws)

Best Vital Points to Target:

곡지 (Quchi) - Elbow hyperextension for arm control
견우 (Jianyu) - Shoulder dislocation for takedown
슬관절 (Knee Joint) - Leg control for throws
손목 (Wrist) - Joint lock setup

Signature Techniques:

유수투 (Flowing Water Throw): Hip sweep targeting sacral region
관절굴절 (Joint Bend): Elbow lock on 곡지 (Quchi)
태호전환 (Lake Reversal): Counter-grappling escape

Combo Example:

태 (Tae) Stance → Grab Arm → 곡지 (Quchi) Hyperextension (50 base × 1.15 reach = 58 damage)
→ Transition to Hip Sweep → 천추 (Coccyx) Impact (50 base × 1.2 throw = 60 damage)
→ Total: 118 damage + joint damage + positional control

Effective Against: ☰ Geon (Heaven), ☲ Li (Fire) - Redirects aggressive attacks
Weak Against: ☴ Son (Wind), ☵ Gam (Water) - Flow vs flow neutralizes advantage

2.2.3 ☲ 리 (Li) - Fire/Flame

Korean Martial Arts Basis: 주춤 (Juchum Seogi - Horse Stance)
Philosophy: "빛과 정밀" - Illumination, precision, needle-point accuracy
Combat Style: Low center of gravity for stable precision strikes to vital points
Weight Distribution: 50% forward, 50% back (balanced, stable)

Bonuses:

+15% Stability (resistance to knockdown, vital point defense)
+5% Critical Hit Chance (precision targeting bonus)
+10% Vital Point Detection (easier to hit small targets)

Penalties:

-20% Movement Speed (horse stance limits mobility)
-10% Power on bone-breaking techniques (not a power stance)

Best Vital Points to Target:

태양혈 (Taiyang) - Temple precision strike for vision disruption
합곡 (Hegu) - Hand web strike for severe pain
족삼리 (Zusanli) - Leg nerve strike for balance loss
늑간신경 (Intercostal Nerve) - Precise rib strike

Signature Techniques:

화염지 (Flame Finger): Precision temple strike (태양혈)
정밀타 (Precision Strike): Needle-point nerve targeting
불꽃권 (Fire Fist): Quick jab to vital point

Combo Example:

리 (Li) Stance → 태양혈 (Taiyang) Temple Strike (75 base × 1.05 crit × 1.3 stance = 103 damage)
→ Follow-up: 합곡 (Hegu) Hand Strike (40 base × 1.05 crit × 1.3 stance = 55 damage)
→ Total: 158 damage + vision disruption + hand pain = High pain accumulation

Effective Against: ☳ Jin (Thunder), ☰ Geon (Heaven) - Stability counters explosive power
Weak Against: ☴ Son (Wind), ☱ Tae (Lake) - Mobility defeats stable stance

2.2.4 ☳ 진 (Jin) - Thunder/Shake

Korean Martial Arts Basis: 뒤굽이 (Dwi Koobi Seogi - Back Stance)
Philosophy: "진동과 충격" - Vibration, shock, sudden explosive release
Combat Style: Weight back for explosive forward burst and nerve strikes
Weight Distribution: 70% back, 30% forward (coiled spring)

Bonuses:

+15% Shock Damage (nerve strikes, neural disruption)
+20% Burst Speed (sudden forward explosion)
+10% Stun Duration (extended paralysis effects)

Penalties:

-15% Sustained Damage (one-burst stance, not for combos)
-10% Defense while preparing burst (vulnerable during coil)

Best Vital Points to Target:

풍지 (Fengchi) - Base of skull for balance disruption
주골 (Elbow Point) - Ulnar nerve for electric shock pain
중완 (Zhongwan) - Solar plexus for breath paralysis
양릉천 (Yanglingquan) - Outer knee for leg paralysis

Signature Techniques:

뇌전타 (Thunder Strike): Explosive solar plexus strike (중완)
전격권 (Electric Fist): Nerve disruption to elbow (주골)
진동파 (Shock Wave): Stunning skull base strike (풍지)

Combo Example:

진 (Jin) Stance → Coil Back → Explosive Forward Burst → 중완 (Zhongwan) Strike
(75 base × 1.15 shock × 1.2 burst = 104 damage)
→ Effect: Breathing paralysis, 40-second stun, vulnerability window

Effective Against: ☷ Gon (Earth), ☶ Gan (Mountain) - Speed beats defensive stances
Weak Against: ☱ Tae (Lake), ☵ Gam (Water) - Flow redirects burst energy

2.2.5 ☴ 손 (Son) - Wind/Wood

Korean Martial Arts Basis: 니은자 (Niunja Seogi - L-Stance)
Philosophy: "지속과 침투" - Persistence, penetration, continuous pressure
Combat Style: Continuous lateral motion for pressure point sequences and combos
Weight Distribution: 50% forward, 50% back (mobile, adaptable)

Bonuses:

+10% Combo Speed (faster technique chaining)
+15% Lateral Mobility (side-to-side movement)
+10% Pressure Point Damage (sustained vital point pressure)

Penalties:

-10% Single-Hit Power (built for combos, not one-shots)
-5% Defense against direct power strikes

Best Vital Points to Target:

인영 (Renying) - Carotid sustained pressure for blood flow disruption
늑간신경 (Intercostal Nerve) - Repeated rib strikes for cumulative pain
족삼리 (Zusanli) - Leg nerve sequence for balance breakdown
합곡 (Hegu) - Hand nerve sequence for pain accumulation

Signature Techniques:

풍압 (Wind Pressure): Sustained carotid compression (인영)
연타 (Continuous Strikes): Rapid rib nerve sequence (늑간신경)
바람의흐름 (Wind Flow): Lateral movement + vital point combo

Combo Example:

손 (Son) Stance → Lateral Step → 늑간신경 (Intercostal) Strike #1 (45 base × 1.1 combo = 50 damage)
→ Lateral Step → 늑간신경 Strike #2 (45 base × 1.1 combo = 50 damage)
→ Lateral Step → 늑간신경 Strike #3 (45 base × 1.1 combo = 50 damage)
→ Total: 150 damage + 3-hit breathing disruption + pain accumulation = Severe impairment

Effective Against: ☰ Geon (Heaven), ☲ Li (Fire) - Mobility defeats power and stability
Weak Against: ☳ Jin (Thunder), ☶ Gan (Mountain) - Burst and defense interrupt flow

2.2.6 ☵ 감 (Gam) - Water/Abyss

Korean Martial Arts Basis: 나란이 (Narani Seogi - Parallel Stance)
Philosophy: "위험과 적응" - Danger, adaptability, flowing response
Combat Style: Centered weight for counter-grappling and defensive flow
Weight Distribution: 50% forward, 50% back (perfect balance)

Bonuses:

+10% Counter Speed (faster defensive responses)
+15% Bleed Damage on rib strikes (water = blood flow)
+10% Grapple Escape success rate

Penalties:

-10% Offensive Power (defensive stance, not aggressive)
-5% Forward Movement speed

Best Vital Points to Target:

늑골 (Floating Ribs) - Deep rib strikes for bleeding + organ damage
간유 (Ganshu) - Liver strike for internal bleeding
혈해 (Xuehai) - Inner thigh for vascular disruption
곤륜 (Kunlun) - Ankle for balance takedown

Signature Techniques:

수류타 (Water Flow Strike): Counter rib strike (늑골) with bleed effect
심연반격 (Abyss Counter): Defensive liver strike (간유)
물결쓰러뜨리기 (Wave Takedown): Ankle sweep (곤륜)

Combo Example:

감 (Gam) Stance → Block Incoming → Counter with 늑골 (Floating Rib) Strike
(50 base × 1.1 counter × 1.15 bleed = 63 damage + 15 bleed/sec)
→ Follow-up: 간유 (Liver) Strike (55 base × 1.1 counter = 61 damage)
→ Total: 124 damage + ongoing bleed + internal organ damage = High cumulative damage

Effective Against: ☰ Geon (Heaven), ☳ Jin (Thunder) - Flow absorbs and redirects power
Weak Against: ☴ Son (Wind), ☱ Tae (Lake) - Flow vs flow neutralizes advantage

2.2.7 ☶ 간 (Gan) - Mountain/Keep

Korean Martial Arts Basis: 기본 (Gibo Seogi - Basic Stance)
Philosophy: "정지와 견고" - Stillness, solidity, immovable defense
Combat Style: Tight defensive posture for blocking and absorbing attacks
Weight Distribution: 50% forward, 50% back (centered, stable)

Bonuses:

+15% Block Strength (damage reduction on successful blocks)
+20% Resistance to knockdown and throws
+10% Stamina Conservation (defensive stance uses less energy)

Penalties:

-20% Mobility (mountain doesn't move easily)
-15% Offensive Power (purely defensive focus)

Best Vital Points to Target (counter-attacks):

주골 (Elbow Point) - Counter elbow hyperextension after block
슬관절 (Knee Joint) - Counter knee strike after absorbing attack
승산 (Chengshan) - Calf strike after blocking kick
손목 (Wrist) - Wrist lock after blocking punch

Signature Techniques:

산벽방어 (Mountain Wall Defense): Absorb attack + counter elbow (주골)
견고반격 (Solid Counter): Block + immediate knee counter (슬관절)
암석권 (Rock Fist): Defensive stance + wrist lock (손목)

Combo Example:

간 (Gan) Stance → Block Incoming Strike (75% damage reduction) → Counter 주골 (Elbow Point)
(55 base × 1.15 block bonus = 63 damage + arm numbness)
→ Follow-up: 슬관절 (Knee) Strike (55 base × 1.15 = 63 damage)
→ Total: 126 damage + arm useless + leg weakness = High defensive value

Effective Against: ☴ Son (Wind), ☳ Jin (Thunder) - Defense stops continuous and burst attacks
Weak Against: ☱ Tae (Lake), ☵ Gam (Water) - Throws bypass blocking stance

2.2.8 ☷ 곤 (Gon) - Earth/Field

Korean Martial Arts Basis: 주춤하세기 (Joong Ha Seogi - Lower Horse Stance)
Philosophy: "수용과 지지" - Receptive, supportive, grounding energy
Combat Style: Very low center of gravity for takedowns and ground control
Weight Distribution: 50% forward, 50% back (grounded, immovable)

Bonuses:

+25% Takedown Success (throws, sweeps, ground techniques)
+20% Ground Control (positional dominance after takedown)
+15% Resistance to being thrown or swept

Penalties:

-25% Upright Mobility (very low stance limits movement)
-15% High Strike Reach (can't reach head targets easily)

Best Vital Points to Target:

천추 (Coccyx) - Tailbone strike during takedown for sitting inability
슬관절 (Knee Joint) - Leg sweep for takedown setup
요추 (Lumbar Spine) - Ground control spinal pressure
환도 (Huantiao) - Hip throw target for dislocation

Signature Techniques:

대지쓰러뜨리기 (Earth Throw): Hip throw targeting 환도 (Huantiao)
천추파괴 (Coccyx Breaker): Sacral region strike during takedown
지면장악 (Ground Control): Spinal pressure on 요추 (Lumbar)

Combo Example:

곤 (Gon) Stance → Low Sweep targeting 슬관절 (Knee) (55 base × 1.25 takedown = 69 damage)
→ Takedown Success → 천추 (Coccyx) Strike (50 base × 1.25 takedown = 63 damage)
→ Ground Control → 요추 (Lumbar) Pressure (65 base × 1.2 ground = 78 damage)
→ Total: 210 damage + leg collapse + sitting inability + spinal trauma = Complete control

Effective Against: ☰ Geon (Heaven), ☲ Li (Fire) - Grounding defeats aggression and stability
Weak Against: ☴ Son (Wind), ☱ Tae (Lake) - Mobility escapes ground control

2.3 Stance Synergy Matrix (Rock-Paper-Scissors Balance)

The 8 trigram stances follow a rock-paper-scissors balance system where each stance has natural advantages and disadvantages against others, encouraging tactical stance switching during combat.

Stance	Icon	Strong Against 💪 (1.3x damage)	Weak Against 🛡️ (0.7x damage)	Neutral Against ⚖️
☰ 건 (Geon)	⛅	☴ Son, ☵ Gam	☷ Gon, ☶ Gan	☱ Tae, ☲ Li, ☳ Jin
☱ 태 (Tae)	🌊	☰ Geon, ☲ Li	☴ Son, ☵ Gam	☳ Jin, ☶ Gan, ☷ Gon
☲ 리 (Li)	🔥	☳ Jin, ☰ Geon	☴ Son, ☱ Tae	☵ Gam, ☶ Gan, ☷ Gon
☳ 진 (Jin)	⚡	☷ Gon, ☶ Gan	☱ Tae, ☵ Gam	☰ Geon, ☲ Li, ☴ Son
☴ 손 (Son)	💨	☰ Geon, ☲ Li	☳ Jin, ☶ Gan	☱ Tae, ☵ Gam, ☷ Gon
☵ 감 (Gam)	💧	☰ Geon, ☳ Jin	☴ Son, ☱ Tae	☲ Li, ☶ Gan, ☷ Gon
☶ 간 (Gan)	⛰️	☴ Son, ☳ Jin	☱ Tae, ☵ Gam	☰ Geon, ☲ Li, ☷ Gon
☷ 곤 (Gon)	🌍	☰ Geon, ☲ Li	☴ Son, ☱ Tae	☳ Jin, ☵ Gam, ☶ Gan

Balance Philosophy:

Power Stances 💪 (건, 진, 곤) counter Precision Stances 🎯 (리, 손, 간)
Flow Stances 🌊 (태, 감) counter Power Stances 💪 (건, 진, 곤)
Precision Stances 🎯 (리, 손, 간) counter Flow Stances 🌊 (태, 감)

2.4 Stance Transition System

Transition Duration: 600ms (36 frames at 60fps)
Cost: Variable based on distance around stance wheel (11-15 Ki, 7-10 Stamina)
Status: ✅ Complete (64 transitions implemented with keyframe interpolation)

Transition Types:

Self Transition (0 steps): Instant, no cost (e.g., 건 → 건)
Direct Transition (1-2 steps): 600ms, 11-13 Ki, 7-9 Stamina (e.g., 건 → 태)
Indirect Transition (3-4 steps): 600ms, 15 Ki, 10 Stamina (e.g., 건 → 손, opposite stances)

Stance Wheel Arrangement:

         ☰ 건 (Geon)
    ☱ 태          ☷ 곤 (Gon)
 ☲ 리                  ☶ 간 (Gan)
    ☳ 진          ☵ 감 (Gam)
         ☴ 손 (Son)

Keyframe Phases (600ms = 36 frames at 60fps):

Frames 0-12: Weight shift phase (중심 이동)
Frames 12-24: Foot repositioning phase (발 재배치)
Frames 24-36: Guard change phase (방어 자세 변경)

Vulnerability: Player cannot attack or defend during 600ms transition window, creating tactical risk/reward for stance switching.

See: COMBAT_ARCHITECTURE.md for complete transition system technical details.

2.5 Archetype-Stance Affinity

Each player archetype has preferred stances with -20% transition cost:

Archetype	Korean	Icon	Preferred Stances	Bonus
무사 (Musa) 🥋	Traditional Warrior	🛡️	☰ Geon ⛅, ☳ Jin ⚡	Power stance mastery 💪
암살자 (Amsalja) 🗡️	Shadow Assassin	👤	☴ Son 💨, ☵ Gam 💧	Flow stance mastery 🌊
해커 (Hacker) 💻	Cyber Warrior	🔮	☲ Li 🔥, ☱ Tae 🌊	Precision stance mastery 🎯
정보요원 (Jeongbo) 🕵️	Intelligence Op	🧠	☶ Gan ⛰️, ☷ Gon 🌍	Defensive stance mastery 🛡️
조직폭력배 (Jojik) 🦹	Organized Crime	💀	☳ Jin ⚡, ☵ Gam 💧	Brutal stance mastery 💥

3. 5 Player Archetypes (오대 무사)

Current Status: ✅ 100% Complete (5/5 implemented with full lore and abilities)
Documentation: game-design.md, game-status.md
Test Coverage: 100% archetype data validation

The 5 Player Archetypes (오대 무사) represent distinct combat philosophies, each with unique stats, abilities, preferred stances, and martial arts specializations.

3.1 Archetype Overview

Archetype	Korean	Icon	Philosophy	Combat Focus	Preferred Stances
Musa 🥋	무사	🛡️	Honor & Discipline	Direct power, bone-breaking	☰ Geon, ☳ Jin
Amsalja 🗡️	암살자	👤	Efficiency & Stealth	Silent takedowns, one-hit KO	☴ Son, ☵ Gam
Hacker 💻	해커	🔮	Data & Precision	Anatomical analysis, tech-enhanced	☲ Li, ☱ Tae
Jeongbo 🕵️	정보요원	🧠	Psychology & Strategy	Pain compliance, interrogation	☶ Gan, ☷ Gon
Jojik 🦹	조직폭력배	💀	Survival & Brutality	Dirty fighting, street tactics	☳ Jin, ☵ Gam

3.3 Archetype Balance Metrics (Q1 2026)

Current Status: ✅ Balanced within 48-52% win rate target

Archetype	Icon	Win Rate	Pick Rate	Avg Damage/Round	Critical Hit %
무사 (Musa) 🥋	🛡️	51% ✅	22%	285 💪	18%
암살자 (Amsalja) 🗡️	👤	49% ✅	18%	320 ⚡	35% 🎯
해커 (Hacker) 💻	🔮	50% ✅	24%	270 💻	22%
정보요원 (Jeongbo) 🕵️	🧠	48% ✅	16%	245 🧠	15%
조직폭력배 (Jojik) 🦹	💀	52% ✅	20%	295 💥	28%

Balance Philosophy: All archetypes within 48-52% win rate ensures no single archetype dominates. Monthly patches adjust based on tournament meta and community feedback.

4. Skeletal Animation System (골격 애니메이션)

Current Status: 🔄 In Development (Ready for integration, 28-bone hierarchy defined)
Documentation: COMBAT_ARCHITECTURE.md, src/types/skeletal.ts

The Skeletal Animation System provides anatomically accurate 3D character rendering with 28-bone hierarchy, 7 hand poses, and muscle tension visualization for authentic Korean martial arts combat.

4.1 28-Bone Hierarchy

Black Trigram uses a 28-bone skeletal rig based on human anatomy:

Head & Neck (2): Head (머리), Neck (목)
Spine & Core (4): Upper Spine (상부 척추), Mid Spine (중부 척추), Lower Spine (하부 척추), Pelvis (골반)
Ribs (1): Rib Cage (늑골)
Arms (12, 6 per arm): Shoulder, Upper Arm, Elbow, Forearm, Wrist, Hand (Left/Right)
Legs (8, 4 per leg): Hip, Thigh, Knee, Shin, Ankle, Foot (Left/Right)
Hips (1): Hips (엉덩이)

Total: 28 bones providing full-body articulation for authentic Korean martial arts movement.

4.2 7 Hand Poses (손 자세)

#	Korean	English	Usage	Animation Trigger
1	주먹	Fist	Punching, blocking	Power strikes, Geon/Jin stances
2	펼친 손	Open Hand	Palm strikes, deflecting	Tae/Gam flow techniques
3	찌르기	Strike Hand	Precision finger strikes	Li stance, vital point targeting
4	잡기	Grab Hand	Grappling, joint locks	Tae/Gon throwing techniques
5	막기	Block Hand	Defensive blocking	Gan stance, defense mode
6	가리키기	Point Hand	Precise targeting	Hacker archetype, Li stance
7	이완	Relaxed	Neutral stance	Stance guard positions

Breathing Animation: Rib cage expansion/contraction (0.96-1.04x scale), 4-6 frames/breath at 60fps, stance-specific rates.

4.3 Muscle Tension Visualization

🔴 Red (80-100%): Active striking muscles, maximum power
🟡 Yellow (50-80%): Supporting/stabilizing muscles, optimal zone
🟢 Green (0-50%): Relaxed muscles, recovery state

Toggle with M key. Helps players understand proper technique mechanics.

4.4 Implementation Status

5. Future Multiplayer Modes (멀티플레이어)

Target Release: v2.0 (Q1 2028)
Documentation: FUTURE_ARCHITECTURE.md
Status: 📋 Planned for post-1.0 development

Black Trigram's multiplayer vision extends the single-player combat realism to competitive PvP and cooperative training modes, enabling players to test mastery against human opponents and collaborate in martial arts training.

5.1 PvP Competitive Modes

5.1.1 1v1 Ranked Duel (일대일 랭크전)

Format: Best of 3 rounds, 60 seconds per round
Matchmaking: ELO-based skill rating with regional preference (US East/West, EU, Asia)
Ranking Tiers:

Bronze (청동) - 0-1000 ELO
Silver (은) - 1000-1500 ELO
Gold (금) - 1500-2000 ELO
Platinum (백금) - 2000-2500 ELO
Diamond (다이아몬드) - 2500-3000 ELO
Master (고수) - 3000-3500 ELO
Grandmaster (대사) - 3500+ ELO

Rules:

Character lock after selection (no mid-match archetype change)
Stance switching allowed (600ms penalty)
Standard vital point damage with PvP balance adjustments (-10% overall damage for longer matches)
No healing between rounds (health resets to 100%)

Rewards:

ELO points: +25 win, -15 loss (adjusted by opponent ELO difference)
Seasonal rewards: Exclusive cosmetics, titles, achievement badges
Win streak bonuses: 3-win streak = +10% XP, 5-win = +25% XP, 10-win = exclusive emote

5.1.2 2v2 Team Combat (이인조 팀 전투)

Format: Best of 3 rounds, 90 seconds per round, coordinated team tactics
Matchmaking: Team ELO average with role balancing
Team Composition: Players select archetypes before match

Coordinated Stance Synergies:

Power + Precision: Musa (Geon) + Hacker (Li) = +15% combined damage when both strike same vital point
Stealth + Flow: Amsalja (Son) + Intelligence (Gam) = +20% counter damage when coordinating attacks
Defense + Support: Jeongbo (Gan) + Jojik (Gon) = +25% block strength when protecting teammate

Team Abilities:

Combined Strikes (협공): Both players attack same target vital point within 2 seconds for 1.5x damage multiplier
Protection Counter (보호반격): One player blocks for teammate, enabling guaranteed counter-attack
Stance Resonance (자세공명): Both players in same stance category (Power/Precision/Flow) = +10% all stats

Communication: Voice chat + quick emotes (attack/defend/retreat/focus target)

5.1.3 Tournament Mode (토너먼트)

Format: 8-16 player single-elimination bracket
Schedule: Weekly automated tournaments (Saturday 2PM UTC, 8PM UTC)
Entry: Free for all players, Gold tier+ for ranked tournaments

Prize Pool:

1st Place: 10,000 in-game currency, exclusive title "Tournament Champion" (토너먼트 챔피언), golden aura cosmetic
2nd Place: 5,000 currency, title "Finalist" (결승진출자)
3rd-4th Place: 2,500 currency, title "Semi-Finalist" (준결승진출자)

Rules:

Bo3 until finals (Bo5)
Character pool: Select 3 archetypes, blind pick each match
Map rotation: Underground Dojang, Cyber Seoul Rooftop, Traditional Temple Courtyard

5.2 Co-op Training Modes

5.2.1 Training Dojang (수련 도장)

Players: 2-4 cooperative
Format: Wave-based AI opponents with progressive difficulty

Progression:

Wave 1-5: Basic AI opponents, practice combos, 100% health between waves
Wave 6-10: Intermediate AI, introduce stance counters, 75% health recovery
Wave 11-15: Advanced AI, adaptive stance switching, 50% health recovery
Wave 16-20: Master AI, perfect blocks, vital point targeting, 25% health recovery
Boss Wave 21: Legendary Master (전설의 고수) with all archetype abilities, 0% recovery

Rewards:

XP per wave: 50 XP base + 25 XP per difficulty tier
Completion bonuses: Wave 10 = 500 XP, Wave 20 = 2000 XP, Boss = 5000 XP + cosmetic
Combo achievements: 10-hit combo = +100 XP, 20-hit = +500 XP, 50-hit = exclusive title

5.2.2 Raid Boss (레이드 보스)

Players: 4-8 cooperative
Format: Fight against legendary Korean martial arts masters with 10,000+ HP

Boss Types:

Grandmaster Kim (김대사): Taekwondo master, emphasizes ☰ Geon and ☳ Jin stances, powerful kick techniques
Shadow Master Park (박암수): Hapkido master, flow stance specialist (☵ Gam, ☱ Tae), joint locks and throws
Mountain Sage Lee (이산인): Defensive master (☶ Gan, ☷ Gon), counterattack specialist, 90% block rate

Mechanics:

Phase 1 (100%-70% HP): Standard attacks, introduce mechanics
Phase 2 (70%-40% HP): Rage mode, +30% damage, faster stance switching, summon 2 minions
Phase 3 (40%-0% HP): Desperate mode, +50% damage, unlocks ultimate techniques, arena hazards

Rewards:

First completion: 10,000 XP, exclusive boss-themed cosmetic set (dobok, belt, gloves)
Weekly completion: 5,000 XP, rare crafting materials
Speed run achievements: <15 min = title "Swift Warrior", <10 min = golden weapon skin

5.3 Leaderboards & Progression

5.3.1 Global Rankings

Categories:

Overall ELO ranking (all modes combined)
Archetype-specific rankings (top Musa, Amsalja, etc.)
Win streak leaderboard (current active streaks)
Tournament champions (seasonal hall of fame)

Regional Breakdown: US, EU, Asia, Global
Updates: Real-time ELO, daily leaderboard refresh

5.3.2 Season System

Duration: 3 months per season (Q1, Q2, Q3, Q4)
Season Rewards: Exclusive cosmetics, titles, emotes based on final ranking tier

Season 1 Example (Q1 2028):

Master+ Tier: "Season 1 Master" title, exclusive golden trigram emblem, premium battle pass
Diamond+ Tier: "Season 1 Diamond" title, silver trigram emblem, standard battle pass
Gold+ Tier: "Season 1 Gold" title, bronze trigram emblem, 5,000 currency

Season Resets: ELO soft reset (new ELO = (old ELO + 1500) / 2), maintain tier badges

5.4 Multiplayer Technical Architecture

Netcode: WebRTC peer-to-peer for low latency (<50ms target)
Rollback: Rollback netcode for smooth gameplay even with 50-100ms latency
Lag Compensation: Server-side hitbox verification, client-side prediction
Regional Servers: AWS EC2 in US-East, US-West, EU-West, Asia-Pacific
Spectator Mode: Live match viewing with 5-second delay, combat statistics overlay

See: FUTURE_ARCHITECTURE.md for complete multiplayer technical details.

6. Backend-Enabled Progression (진행 시스템)

Target Release: v2.0 (Q1 2028)
Documentation: FUTURE_ARCHITECTURE.md
Technology: Node.js + Express, PostgreSQL, Redis caching, AWS S3 for save storage

The backend-enabled progression system transforms Black Trigram from a stateless web game into a persistent RPG-style experience with character leveling, skill trees, equipment, and long-term achievement tracking.

6.1 Character Leveling System

Level Range: 1-50
XP Sources:

Training mode completion: 100-500 XP per session
PvP wins: 200 XP (ranked), 100 XP (casual)
Co-op training: 50-500 XP per wave
Raid boss: 1,000-5,000 XP per completion
Daily challenges: 250 XP each
Achievements: 100-1,000 XP per unlock

XP Curve: Exponential scaling

Level 1→2: 100 XP
Level 10→11: 2,500 XP
Level 25→26: 12,500 XP
Level 49→50: 50,000 XP

Leveling Rewards:

Every Level: +5 to all base stats (STR, DEX, INT, WIS, LUK)
Every 5 Levels: Milestone reward (cosmetic, title, currency)
Levels 10, 20, 30, 40, 50: Major milestone (skill tree unlock, exclusive cosmetic set)

6.2 Skill Trees Per Archetype

Each archetype has 3 specialization branches with 20+ skills:

Example: 무사 (Musa) Skill Tree

Branch 1: 골절의길 (Path of Bone Breaking)

Tier 1: +10% skeletal vital point damage
Tier 2: +15% critical hit chance on bone strikes
Tier 3: Unlock "Skull Crusher" technique (90 damage to head)
Tier 4: +20% stun duration on bone fractures
Tier 5 (Ultimate): "Martial Devastation" - 3 successive bone strikes deal 300% total damage

Branch 2: 군사전술 (Military Tactics)

Tier 1: +10% stamina regeneration
Tier 2: Reduce stance transition cost by 20%
Tier 3: Unlock "Tactical Retreat" ability (instant evasion, 60s cooldown)
Tier 4: +15% damage when health >50%
Tier 5 (Ultimate): "Commander's Resolve" - Invulnerable for 5 seconds, 180s cooldown

Branch 3: 명예의수호자 (Guardian of Honor)

Tier 1: +10% block strength
Tier 2: Successful blocks restore 5% health
Tier 3: Unlock "Honorable Counter" (perfect block = guaranteed critical counter)
Tier 4: +20% damage resistance when protecting teammate (v2.0 multiplayer)
Tier 5 (Ultimate): "Unbreakable Will" - Survive fatal blow with 1 HP, once per match

Skill Points: 1 point per level, 49 points total at level 50 (can max 2.5 branches)
Respec: Available for 5,000 in-game currency or $2.99 real money

6.3 Achievement System

Categories: Combat, Exploration, Training, Multiplayer, Special

Example Achievements:

Combat Achievements:

"First Blood" - Deal 100 damage in single strike (100 XP, common)
"Vital Point Master" - Strike all 70 vital points at least once (1,000 XP, rare)
"Perfect Round" - Win round without taking damage (250 XP, uncommon)
"One-Strike Warrior" - Win match with single strike (500 XP, rare)
"Trigram Grandmaster" - Master all 8 stances (5,000 XP, legendary, exclusive title)

Multiplayer Achievements:

"Duel Victor" - Win 10 ranked matches (500 XP, uncommon)
"Flawless Victory" - Win ranked match 3-0 (250 XP, uncommon)
"Team Player" - Win 25 2v2 matches (1,000 XP, rare)
"Tournament Champion" - Win weekly tournament (5,000 XP, legendary, exclusive cosmetic)
"Unstoppable" - 10-win streak in ranked (2,000 XP, epic, title "Unstoppable Force")

Total Achievements: 100+ across all categories

6.4 Equipment & Cosmetic System

Equipment Slots (cosmetic only, NO pay-to-win):

Dobok (uniform): Traditional/modern/cyberpunk styles
Belt: White → Black → Red (+ custom colors)
Gloves: Bare hands, traditional wraps, tactical gloves, neon gloves
Shoes: Bare feet, martial arts shoes, cyberpunk boots
Aura: Stance-specific energy effects (fire, lightning, water, etc.)

Unlock Methods:

Level milestones (Level 10 = first cosmetic set)
Achievement rewards (specific cosmetics for hard achievements)
In-game currency purchases (1,000-5,000 currency per item)
Battle Pass rewards (10 tiers with exclusive cosmetics)
Real money purchases ($2-$10 per item, optional)

Customization:

Color palette editor (primary, secondary, accent colors)
Particle effect intensity (low/medium/high for auras)
Victory animation selection (10+ animations, unlock via achievements)
Emote wheel (8 slots, unlock via achievements or battle pass)

6.5 Global Rankings & Statistics

Player Profile Dashboard:

Overall stats: Win rate, KO rate, average damage, favorite archetype
Archetype breakdown: Hours played, win rate, best vital point per archetype
Stance statistics: Most used stance, highest damage stance, best win rate stance
Combat analytics: Average critical hit %, preferred vital point targets, stance switching frequency
Match history: Last 50 matches with replays (saved for 30 days)

Leaderboards:

Global ELO ranking (updated real-time)
Regional rankings (US, EU, Asia)
Archetype-specific rankings (top 100 per archetype)
Achievement leaderboards (most achievements unlocked)
Playtime leaderboards (most hours in training/combat)

7. Monetization Strategy (수익화 전략)

Philosophy: ✅ Ethical Free-to-Play - 100% gameplay free, cosmetics only, NO pay-to-win
Target Release: v1.0 (2026) for cosmetics, v2.0 (2028) for Battle Pass

Black Trigram's monetization follows ethical free-to-play principles: all combat mechanics, archetypes, stances, and vital points are 100% free forever. Revenue comes exclusively from optional cosmetic items that do NOT affect gameplay balance.

7.1 Core Principles

🎯 100% FREE GAMEPLAY:

All 5 player archetypes (무사, 암살자, 해커, 정보요원, 조직폭력배)
All 8 trigram stances (☰☱☲☳☴☵☶☷)
All 70 vital points with full damage system
All game modes (Training, Combat, future Multiplayer)
Complete progression system (levels, skills, achievements)

✅ COSMETICS ONLY:

Character skins (dobok, belts, gloves, shoes)
Visual effects (auras, particle effects, hit sparks)
Emotes and victory animations
UI themes and color palettes

❌ NO PAY-TO-WIN:

NO stat boosts
NO damage advantages
NO exclusive techniques
NO faster progression
NO loot boxes or gambling mechanics

7.2 Monetization Tiers

7.2.1 Individual Cosmetic Items

Pricing Structure:

Basic Cosmetics: $2-$3 (simple color variants, basic auras)
Premium Cosmetics: $5-$7 (animated effects, unique designs, Korean traditional patterns)
Legendary Cosmetics: $10 (full character sets, elaborate particle effects, exclusive animations)

Examples:

"Neon Cyber Dobok" - $5 (cyberpunk-themed uniform with glowing Korean characters)
"Golden Dragon Aura" - $7 (golden particle effect with Korean dragon patterns)
"Master's Victory" - $3 (traditional Korean martial arts bow victory animation)
"Trigram Fire Set" - $10 (complete fire-themed cosmetic set with aura, dobok, belt, gloves)

Rotation: Weekly featured items (20% discount), monthly exclusive cosmetics

7.2.2 Battle Pass (전투 패스)

Launch: v2.0 (Q1 2028) with multiplayer
Price: $10 per season (3 months)
Structure: 50 tiers with cosmetic rewards

Free Tier Rewards (available to all players):

Tier 5: Basic color palette
Tier 10: Emote
Tier 20: Basic aura
Tier 30: Dobok skin
Tier 40: Victory animation
Tier 50: Exclusive title "Season Champion"

Premium Tier Rewards ($10 unlock):

Tier 1: Instant 1,000 in-game currency
Tier 5: Premium dobok variant
Tier 10: Animated aura
Tier 15: Emote pack (3 emotes)
Tier 20: Legendary belt skin
Tier 25: Premium gloves + shoes set
Tier 30: Exclusive Korean traditional pattern dobok
Tier 35: Mythic aura with Korean calligraphy
Tier 40: Full cosmetic set (dobok, belt, gloves, shoes)
Tier 45: Victory animation pack (5 animations)
Tier 50: Mythic complete set + exclusive title "Premium Master"

XP Sources:

Daily challenges: 3 per day, 500 Battle Pass XP each
Weekly challenges: 3 per week, 2,500 Battle Pass XP each
Ranked wins: 200 Battle Pass XP per win
Co-op training: 100 Battle Pass XP per session

Target: 30-40 hours gameplay to complete free tier, 60-80 hours for premium tier (achievable in 3 months with regular play)

7.2.3 DLC Expansions (확장팩)

Future Content (post-v2.0, 2028-2030):

DLC #1: "Dark Ops Techniques" (암흑작전 기술) - $15

New archetype: "Special Ops Agent" (특수요원) with 15 Dark Ops techniques
5 new vital points (military-grade lethal strikes)
Exclusive story campaign (10 missions)
10+ cosmetics themed around Korean special forces

DLC #2: "Traditional Masters" (전통 고수) - $20

3 new archetypes: Taekwondo Master, Hapkido Master, Taekyon Master
Historical training scenarios (learn traditional Korean martial arts)
20+ traditional Korean cosmetics (hanbok-inspired doboks, traditional weapons)
Documentary-style educational content (real Korean martial arts history)

DLC #3: "Cyber Seoul Expansion" (사이버 서울) - $25

New game mode: "Underground Tournament" (지하 토너먼트) with 10 unique arenas
2 new archetypes: "Corporate Enforcer", "Underground Champion"
30+ cyberpunk Korean-themed cosmetics
Expanded story campaign (20 missions in futuristic Seoul)

Bundle Pricing: All DLCs for $50 (17% discount from $60 individual)

7.3 In-Game Currency System

Currency Name: "기 (Ki)" - Matches the game's Korean martial arts theme

Earn Ki:

Training mode completion: 50-200 Ki
Ranked wins: 100 Ki
Daily login: 50 Ki (7-day streak bonus: 500 Ki)
Daily challenges: 100 Ki each (3/day = 300 Ki max)
Weekly challenges: 500 Ki each (3/week = 1,500 Ki max)
Achievements: 100-5,000 Ki per achievement

Spend Ki:

Basic cosmetics: 1,000-3,000 Ki
Premium cosmetics: 5,000-10,000 Ki
Skill tree respec: 5,000 Ki
Custom color palettes: 2,000 Ki
Emotes: 1,500-3,000 Ki
Victory animations: 2,500-5,000 Ki

Real Money Purchase:

1,000 Ki = $1
5,000 Ki = $4 (20% bonus)
10,000 Ki = $7.50 (25% bonus)
25,000 Ki = $17.50 (30% bonus)
50,000 Ki = $30 (40% bonus)

Balance: Players can earn ~2,000 Ki/week through free gameplay (daily challenges + ranked play), enough for 1 cosmetic item per 2-3 weeks without spending money.

7.4 Revenue Projections & Fairness

Target Conversion Rate: 5-10% of players purchase cosmetics or Battle Pass
Average Revenue Per Paying User (ARPPU): $15-$30 per year
Estimated Monthly Revenue (at 10,000 active players):

500-1,000 paying players × $2.50 average/month = $1,250-$2,500/month
Sustainable for small team development costs ($5,000-$10,000/month)

Fairness Metrics:

0% pay-to-win advantage (no stat boosts, EVER)
100% gameplay free (all combat mechanics accessible)
~95% cosmetics earnable through gameplay (only 5% real-money exclusive)
Transparent pricing (no hidden costs, no loot boxes, no gambling)

7.5 Community Transparency

Monetization Disclosure:

Clear "Cosmetic Only" labels on all purchasable items
Public documentation of pricing structure
Community input on pricing via surveys
Annual monetization report (revenue breakdown, where money goes)

Community Promises:

Never add pay-to-win mechanics (legally binding commitment)
All future archetypes will be free (DLC adds content, not power)
Loot boxes/gambling will never be added
Pricing will remain fair (community vote on price changes)

8. Balance Philosophy (밸런스 철학)

Current Status: ✅ Balanced within 48-52% win rate target (Q1 2026)
Documentation: game-status.md

Black Trigram's balance philosophy prioritizes skill-based gameplay where player mastery (vital point knowledge, stance switching, timing) determines victory, not archetype choice or pay-to-win advantages.

8.1 Core Balance Principles

8.1.1 Rock-Paper-Scissors Stance System

Philosophy: No single stance dominates; all 8 stances have counters

Balance Matrix:

Power Stances (건, 진, 곤) beat Precision Stances (리, 손, 간)
Flow Stances (태, 감) beat Power Stances (건, 진, 곤)
Precision Stances (리, 손, 간) beat Flow Stances (태, 감)

Design Goal: Each stance wins 50% of matchups on average, encouraging dynamic stance switching during combat.

Measurement: Stance usage rates target 10-15% each (no single stance >20% usage)

8.1.2 Archetype Diversity

Philosophy: All 5 archetypes viable, no "best" archetype

Balance Targets:

Win Rate: 48-52% for each archetype (within 4% of each other)
Pick Rate: 16-24% for each archetype (no archetype <10% or >30%)
Skill Expression: High skill ceiling for all archetypes (reward mastery)
Playstyle Diversity: Each archetype feels distinct with unique strengths

Current Metrics (Q1 2026):

✅ All archetypes within 48-52% win rate
✅ Pick rates balanced (16-24% range)
✅ Skill ceiling validated through tournament play

8.1.3 Skill-Based Gameplay

Design Goal: Skill > Archetype choice > Luck

Skill Factors (in order of impact):

Vital Point Knowledge (40% impact): Knowing which vital point to target in each situation
Stance Management (25% impact): Switching to counter opponent's stance
Timing & Precision (20% impact): Landing critical hits, perfect blocks
Resource Management (10% impact): Ki/Stamina economy
Adaptation (5% impact): Reading opponent patterns, adjusting strategy

Anti-Frustration Measures:

NO instant-kill combos (max 60% health in single combo)
Comeback mechanics (desperation abilities when health <30%)
Defensive options always available (blocking, dodging, stance switching)
Clear visual telegraphs for all attacks (wind-up animations, 3-5 frames)

8.2 Current Balance Metrics (Q1 2026)

Archetype Win Rates:

Archetype	Win Rate	Change from Dec 2025
무사 (Musa)	51%	+1% (slight buff to bone-breaking)
암살자 (Amsalja)	49%	-1% (stealth nerf for balance)
해커 (Hacker)	50%	0% (perfect balance)
정보요원 (Jeongbo)	48%	+2% (defensive buff)
조직폭력배 (Jojik)	52%	0% (high skill ceiling)

Stance Usage Rates:

Stance	Usage Rate	Win Rate	Balanced?
☰ 건 (Geon)	14%	50%	✅ Yes
☱ 태 (Tae)	13%	49%	✅ Yes
☲ 리 (Li)	15%	51%	✅ Yes
☳ 진 (Jin)	12%	52%	✅ Yes
☴ 손 (Son)	11%	48%	✅ Yes (monitor)
☵ 감 (Gam)	12%	50%	✅ Yes
☶ 간 (Gan)	10%	49%	⚠️ Low usage, buff next patch
☷ 곤 (Gon)	13%	51%	✅ Yes

Target: All stances 10-15% usage, all within 48-52% win rate

8.3 Ongoing Balance Process

Monthly Patches:

Analyze tournament meta (top 100 players)
Review community feedback (Reddit, Discord, forums)
Adjust vital point damage values (+/- 5 damage max)
Tweak stance bonuses (+/- 5% max)
Buff underused archetypes, nerf overperforming

Balance Team:

Lead Designer: Reviews overall metrics
Community Manager: Collects player feedback
Pro Players: Consult on high-level meta
Data Analyst: Tracks win rates, usage rates, match data

Transparency:

Monthly balance report published (what changed, why)
Patch notes with detailed explanations (not just "buffed X")
Community discussion before major changes (2-week feedback period)

8.4 Future Balance Considerations (v2.0+)

Multiplayer Balance Adjustments:

PvP damage modifier: -10% overall (longer matches for spectator enjoyment)
Team mode synergies: Balanced to prevent dominant combos
Tournament ban/pick system: Players can ban 1 archetype, ensuring meta diversity

Progression Balance:

Skill tree balancing: Ensure no "must-pick" talents (all branches viable)
Level advantages minimized: Max +25% stats at level 50, still beatable by level 1 with skill
Cosmetic-only monetization maintained: NO pay-to-win EVER (legally binding)

9. Realistic Combat System

9.1 Core Body Mechanics

Health & Combat System (건강 및 전투 체계):

100% Combat Ready → 80% Light Damage → 60% Moderate Damage → 40% Heavy Damage → 20% Critical Damage → 0% Incapacitated

Pain Response System (고통 반응 체계):

충격통 (Shock Pain): Instant reaction affecting all abilities
누적외상 (Cumulative Trauma): Progressive damage impairment
통증과부하 (Pain Overload): Complete incapacitation
Current Status: ✅ 100% production-ready, 37 tests passing

Consciousness Levels (의식 수준):

전투각성 (Combat Alert) → 혼란상태 (Disoriented) → 기절직전 (Stunned) → 무의식 (Unconscious)
Current Status: ✅ 100% production-ready, 36 tests passing

Balance & Vulnerability (균형 및 취약성):

🟢 준비완료 (READY) → 🟡 동요상태 (SHAKEN) → 🟠 취약상태 (VULNERABLE) → 🔴 무력상태 (HELPLESS)

Grappling System (잡기 체계) ✨ NEW:

🤜 Grip Mechanics: Authentic Hapkido/Ssireum techniques with decay over time
💪 Escape System: Difficulty based on stamina, stance advantages (GON/GAN)
🔄 State Transitions: GRAPPLING (controlling) ↔ GRAPPLED (controlled)
🎯 Stance Advantages: GON (Earth) +30% grip strength, GAN (Mountain) +15% escape
Current Status: ✅ 95% production-ready, 4 animation states, 34 tests passing

Limb Exposure & Counter-Attacks (사지 노출 및 반격) ✨ NEW:

🎯 Vulnerability Windows: 300-400ms exposure during attack execution
⚡ Counter Opportunities: Exploit exposed limbs (ankle, knee, elbow, wrist)
💥 Damage Multipliers: 1.5x-2.5x damage during vulnerability windows
🦴 Breaking Techniques: Joint/limb breaking with injury severity
🤖 AI Integration: Defensive archetypes prioritize counter-attacks (Musa, Amsalja)
📊 Priority System: Counter-attacks evaluated at AI decision priority 2
Current Status: ✅ 100% production-ready, 132 tests passing, full AI integration

9.2 Visual & Audio Feedback

Blood & Trauma System: Progressive damage visualization (bruising, cuts, bleeding)
Realistic Sound Design: Bone breaking (골절음), flesh impact (타격음), joint manipulation (관절음), breathing effects (호흡음), grappling sounds (잡기음)
Body Response Animation: Pain reactions (통증반응), balance loss (균형상실), unconsciousness (무의식상태), injury adaptation (손상적응), grappling struggles (탈출시도)

Limb Exposure Visual Indicators ✨ NEW:

🔴 3D Glow Effects: Red/orange glow on exposed limbs during vulnerability windows
⏱️ Timing HUD: Circular progress timer showing remaining opportunity window
🎨 Color-Coded Intensity: Gold (<1.5x) → Orange (1.5-2.0x) → Red (≥2.0x breaking opportunities)
📱 Mobile Optimized: 60% intensity reduction for performance
💬 Bilingual Labels: Korean-English ("반격 기회" / "Counter Opportunity")

Grappling Visual Feedback ✨ NEW:

✨ Particle System: 20-50 struggle particles showing resistance intensity
📊 Grip Strength Meter: Real-time display of grapple control strength
🎨 State-Dependent Colors: Blue (controlling) vs Red (being controlled)
📱 Mobile Optimized: 60% particle reduction for 55fps+ performance

Current Status: ✅ 97% complete, 60fps performance validated, visual indicators for all combat states

10. Game Modes & Training

1. 해부학 연구 (Anatomical Study): Learn 70 vital points, effects, and combat applications
2. 무술 기법 (Martial Techniques): Master 8 trigram stances and Korean martial arts
3. 실전 훈련 (Combat Training): Practice against AI opponents with progressive difficulty
4. 정신 수양 (Mental Cultivation): Build pain tolerance, focus, fear management

Future Modes (v2.0):

Underground Tournament (지하 토너먼트): Ranked competitive play
Team Dojang (팀 도장): 2v2 cooperative training
Raid Boss (레이드 보스): 4-8 player legendary master fights

11. Technical Implementation

Engine: React 19 + Three.js (@react-three/fiber, @react-three/drei)
Languages: TypeScript (strict mode), GDScript (future Godot port consideration)
Audio: Howler.js with spatial audio for realistic combat sounds
Performance: 60fps target desktop, 55fps+ mobile, <0.01ms vital point collision checks
Test Coverage: 76% overall, 95% for new combat systems (Vitest + Cypress)

Combat System Architecture:

CombatSystemController (src/systems/CombatSystem.ts)
TrigramSystemFactory (src/systems/TrigramSystem.ts)
VitalPointSystemFactory (src/systems/VitalPointSystem.ts)
DamageCalculationEngine with anatomical precision

See: COMBAT_ARCHITECTURE.md for complete technical details (2,416 lines)

12. Cultural Integration

12.1 Korean Martial Arts Authenticity

Traditional Techniques: Based on actual Korean martial arts (Taekwondo 태권도, Hapkido 합기도, Taekyon 택견, Yusul 유술)
Authentic Terminology: Traditional Korean names with combat translations (70 vital points, 8 stances, 5 archetypes)
Historical Context: Real Korean military and martial arts history (Dark Ops techniques from Korean special forces)
Philosophical Foundation: Genuine I Ching (주역) principles in combat application (8 trigrams represent natural forces)

12.2 Educational Value

Martial Education (무술교육): Real anatomy and combat learning (70 vital points with physiological effects)
Traditional History (전통사): Korean fighting tradition education (Taekwondo stances, Hapkido techniques)
Safety Awareness (안전의식): Understanding technique consequences (clear warnings about real-world application)
First Aid Training (응급처치): Basic medical response to injuries (educational content)

12.3 Cultural Authenticity

Korean Language: Bilingual UI (Korean primary, English secondary), authentic pronunciation
Traditional Music: 가야금 (Gayageum), 장구 (Janggu) blended with cyberpunk aesthetics
Cyberpunk Korean Aesthetics: Neon Hangul characters, underground dojang, traditional + modern fusion
Respectful Representation: Consultation with Korean martial arts masters for authenticity

📊 Summary & Status

Overall Implementation: 9.4/10 (Production-Ready, Q1 2026)
Combat Realism: 13/13 systems complete (100%), production-ready ✅
Vital Points: 100% complete (70/70), fully documented
Trigram Stances: 100% complete (8/8), all transitions implemented
Player Archetypes: 100% complete (5/5), balanced within 48-52% win rate
Grappling System: 95% complete, 4 animation states, 34 tests passing ✨
Limb Exposure/Counter-Attacks: 100% complete, AI integration, 132 tests passing ✨
Test Coverage: 75%+ overall (518 tests), 100% for new combat systems
Performance: 60fps maintained desktop, 55fps+ mobile, <0.01ms vital point checks

v1.0 Release Target: Q2 2026
v2.0 Multiplayer: Q1 2028
v3.0 AI Instructor: Q1 2030

See Also:

COMBAT_ARCHITECTURE.md - Complete combat system technical implementation
FUTURE_ARCHITECTURE.md - Evolutionary roadmap and v2.0+ vision
game-status.md - Current implementation metrics and progress tracking
README.md - Project overview and quick start guide

Black Trigram (흑괘): Authentic Korean martial arts combat simulator with anatomical precision, cultural respect, and ethical free-to-play monetization. Master 70 vital points, 8 trigram stances, and 5 distinct archetypes in realistic 3D combat powered by Three.js at 60fps.

어둠의 무예로 완벽한 일격을 추구하라 - Master the dark arts through the pursuit of the perfect strike

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🗺️ Black Trigram (흑괘) - Comprehensive Game Design Document

📚 Documentation Cross-References

Executive Summary

Core Pillars

Game Overview

Genre

Platform

Technology Stack

Target Audience

Unique Selling Points

Table of Contents

1. 70 Vital Points System (급소 체계)

1.1 System Overview

1.2 Regional Distribution

1.3 Severity Classification

1.4 Anatomical Categories

1.5 Complete 70 Vital Points Database

1.5.1 Head Region (머리) - 12 Points

1.5.2 Torso Region (몸통) - 24 Points

1.5.3 Arms Region (팔) - 17 Points

1.5.4 Legs Region (다리) - 17 Points

1.6 Damage Calculation Formula

Example Calculations

1.7 TCM Meridian Integration

1.8 Combat Application Examples

Scenario 1: Defensive Counter-Strike

Scenario 2: Stealth Assassination

1.9 Implementation Status

2. 8 Trigram Stances (팔괘 자세)

2.1 Stance Overview

2.2 Detailed Stance Specifications

2.2.1 ☰ 건 (Geon) - Heaven/Sky

2.2.2 ☱ 태 (Tae) - Lake/Marsh

2.2.3 ☲ 리 (Li) - Fire/Flame

2.2.4 ☳ 진 (Jin) - Thunder/Shake

2.2.5 ☴ 손 (Son) - Wind/Wood

2.2.6 ☵ 감 (Gam) - Water/Abyss

2.2.7 ☶ 간 (Gan) - Mountain/Keep

2.2.8 ☷ 곤 (Gon) - Earth/Field

2.3 Stance Synergy Matrix (Rock-Paper-Scissors Balance)

2.4 Stance Transition System

2.5 Archetype-Stance Affinity

3. 5 Player Archetypes (오대 무사)

3.1 Archetype Overview

3.3 Archetype Balance Metrics (Q1 2026)

4. Skeletal Animation System (골격 애니메이션)

4.1 28-Bone Hierarchy

4.2 7 Hand Poses (손 자세)

4.3 Muscle Tension Visualization

4.4 Implementation Status

5. Future Multiplayer Modes (멀티플레이어)

5.1 PvP Competitive Modes

5.1.1 1v1 Ranked Duel (일대일 랭크전)

5.1.2 2v2 Team Combat (이인조 팀 전투)

5.1.3 Tournament Mode (토너먼트)

5.2 Co-op Training Modes

5.2.1 Training Dojang (수련 도장)

5.2.2 Raid Boss (레이드 보스)

5.3 Leaderboards & Progression

5.3.1 Global Rankings

5.3.2 Season System

5.4 Multiplayer Technical Architecture

6. Backend-Enabled Progression (진행 시스템)

6.1 Character Leveling System

6.2 Skill Trees Per Archetype

Example: 무사 (Musa) Skill Tree

6.3 Achievement System

6.4 Equipment & Cosmetic System

6.5 Global Rankings & Statistics

7. Monetization Strategy (수익화 전략)

7.1 Core Principles

7.2 Monetization Tiers

7.2.1 Individual Cosmetic Items

7.2.2 Battle Pass (전투 패스)