docs: initialize project

.planning/PROJECT.md

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+# Super Pong Next Gen
+
+## What This Is
+
+A next-generation Pong game built in HTML5 — a complete browser game experience that combines stunning visuals (particles, glow, trails, screen shake) with rich gameplay mechanics (power-ups, multiple arenas/stages). Supports both solo play against an AI opponent and local 2-player on the same keyboard. The full package: title screen, mode select, settings, game over — not a demo, a real game.
+
+## Core Value
+
+Pong reimagined with juice and depth — it looks spectacular, plays with twists, and feels complete enough to share proudly.
+
+## Requirements
+
+### Validated
+
+(None yet — ship to validate)
+
+### Active
+
+- [ ] Full game with title screen, mode select, settings, and game over screen
+- [ ] Solo player vs AI opponent (with meaningful difficulty)
+- [ ] Local 2-player on shared keyboard
+- [ ] Particle effects, glow, trails, and screen shake — visually juicy
+- [ ] Power-ups that change gameplay mid-match
+- [ ] Multiple arenas/stages with different layouts or obstacles
+- [ ] Win conditions (score-based match structure)
+
+### Out of Scope
+
+- Online multiplayer — complexity out of scope for v1
+- Mobile touch controls — keyboard-first for v1
+- Persistent leaderboards/accounts — no backend required
+
+## Context
+
+- Pure HTML5/CSS/JavaScript — single file or minimal files, runs in any modern browser
+- No build tools or frameworks required — this is a browser game
+- Target: desktop browsers (Chrome, Firefox, Safari)
+- The "next generation" bar means it should make someone say "whoa" when they first open it
+
+## Constraints
+
+- **Tech Stack**: HTML5 Canvas + vanilla JS — no external game engines
+- **Deployment**: Must run as a static file (no server required)
+- **Scope**: Single-player and local multiplayer only — no network play
+
+## Key Decisions
+
+| Decision | Rationale | Outcome |
+|----------|-----------|---------|
+| HTML5 Canvas + vanilla JS | No build toolchain, runs anywhere, full control over rendering | — Pending |
+| Static single-file delivery | Maximally shareable — just send the .html file | — Pending |
+
+---
+*Last updated: 2026-03-10 after initialization*