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HIGH (Root)
│
├── 1. Splash / Entry
│     ├── 1.1 Logo Intro Animation
│     ├── 1.2 Welcome Message
│     ├── 1.3 CTA: Begin → (Mode Selection)
│     └── 1.4 Learn More (optional modal)
│           └── About AI + Neuroscience
│
├── 2. Mode Selection
│     ├── 2.1 Calm (Theta)
│     ├── 2.2 Focus (Alpha)
│     ├── 2.3 Sleep (Delta)
│     ├── 2.4 High Energy (Beta/Gamma)
│     └── 2.5 Info Tooltip (per mode)
│           └── Explains Hz, purpose, safety
│
├── 3. Generation Screen
│     ├── 3.1 AI Music Generation Animation
│     ├── 3.2 Progress Indicator (Loading 0–100%)
│     ├── 3.3 Micro-messages (“Mixing layers…”, “Finalising…”)
│     └── 3.4 Fallback: Retry or Offline Mode
│
├── 4. Session Preparation
│     ├── 4.1 Mode Summary (e.g. “Flow • 10 Hz • 40 min”)
│     ├── 4.2 Tips (Headphones, Volume, Environment)
│     ├── 4.3 Duration Picker (short / medium / long)
│     ├── 4.4 Optional Toggle: Breathing Overlay
│     └── 4.5 CTA: Start Session
│
├── 5. Listening Experience
│     ├── 5.1 Audio Visualisation Layer (waveform, sphere, etc.)
│     ├── 5.2 Playback Controls
│           ├── Play / Pause
│           ├── Stop / End
│           └── Adjust Intensity (modulation depth)
│     ├── 5.3 Mode Info Header (State • Hz • Duration)
│     ├── 5.4 Dynamic Nudge System
│           ├── “Too sleepy? Try Flow.”
│           └── “Too wired? Drop to Calm.”
│     ├── 5.5 Timer or Loop Indicator
│     └── 5.6 Safety Label (“Headphones recommended”)
│
├── 6. Feedback
│     ├── 6.1 Primary Question (“How did that feel?”)
│     ├── 6.2 Sliders / Emoji Scales
│           ├── Relaxed / Focused / Intensity
│           └── Optional notes input
│     ├── 6.3 Optional Micro-Task
│           └── Short 30–60s focus/awareness task
│     └── 6.4 CTA: Save Feedback → (Summary)
│
├── 7. Summary / Session Complete
│     ├── 7.1 Recap Card (Mode • Duration • Date)
│     ├── 7.2 Progress Graph (trend over last 5 sessions)
│     ├── 7.3 Personalised Message
│           └── “Your mind learned today — great work.”
│     ├── 7.4 CTA Options
│           ├── Replay Mode
│           ├── Try Another Mode
│           └── Share Session
│     └── 7.5 Background Loop (AI ambient outro)
│
├── 8. Dashboard / History (Optional v1.1)
│     ├── 8.1 Weekly Activity Graph
│     ├── 8.2 Top Mode Usage (e.g. “You focused most this week”)
│     ├── 8.3 Total Listening Time
│     ├── 8.4 Quick Start Buttons
│     └── 8.5 Access to Feedback History
│
└── 9. Info / Settings
      ├── 9.1 About HIGH
      ├── 9.2 The Science (AI + Frequency explanation)
      ├── 9.3 Safety & Usage Guidelines
      ├── 9.4 Terms & Privacy
      ├── 9.5 Theme Settings (Light/Dark)
      ├── 9.6 Volume Calibration Test
      └── 9.7 Feedback / Support Link

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/HIGH_App
 ├── Screens
 │    ├── 01_Splash
 │    ├── 02_Mode_Select
 │    ├── 03_Generation
 │    ├── 04_Preparation
 │    ├── 05_Session
 │    ├── 06_Feedback
 │    ├── 07_Summary
 │    ├── 08_Dashboard
 │    └── 09_Info
 │
 ├── Components
 │    ├── Buttons
 │    ├── Cards
 │    ├── Modals
 │    ├── Sliders
 │    ├── Charts
 │    ├── Visuals (Waves, Spheres, Gradients)
 │
 ├── Styles
 │    ├── Colour_Tokens
 │    ├── Typography
 │    ├── Shadows
 │    ├── Gradients
 │
 ├── Assets
 │    ├── Icons
 │    ├── Illustrations
 │    └── Audio_Visual_Placeholders
 │
 └── Prototypes
      ├── Main_Flow
      ├── Audio_Sync_Test
      └── Feedback_Interaction

• Linear Core Flow: Splash → Summary = guided experience (like Calm onboarding).

• Non-linear Entry: From any screen, user can access Dashboard or Info.

• Loopback: From Summary → Mode Selection (encourage next session).

• Fail-safe: If generation fails → fallback to cached sound.