- Play a soft thunder SFX (sfx_thunder_01..04 at volume 0.35) on the
strobe's 0→>0 edge, once per strike; mid-strobe frames stay silent.
- Move `wasOn` latch after the thunder check so it reflects the previous
frame's state (fixes arm-frame and edge detection).
- Add `thunder: false` config to silence the voice while keeping the bolt.
- Cover with tests: arm frame silent, one clap per strike, mute path.
- New NebulaLightning visual: jagged edge-to-edge bolt with branches,
strobed in the gas base/accent colors, plus a soft distant thunder clap
- Pure seeded math (boltStrobe, strikeCycle, boltShape) in SystemEffectsMath,
Node-tested for determinism and shape correctness
- Wired into GameScene create/update/destroy lifecycle
- Config block in data/systems.json types.nebula.effect.lightning; docs
updated with tuning notes and smoke-game probe (?lightning=1&forceStrike=1)
- Add `front` block to game.json: depth-11 clouds above the ship (parallax > 1) that drift past the player, creating a "flying through" feel vs. the back layer at depth 3
- Implement `shiftHue` in Color.js to derive the front accent from the system's base atmosphere color (hue rotation + lightness lift), making every nebula a stable two-tone gas
- Refactor NebulaAtmosphere into a data-driven layer array with per-layer depth/tint/parallax/drift; extract `spawnCloud` helper; scale swirl speed by configurable drift
- Add 21 new test checks covering accent math (hue delta, identity, white/black preservation, all 8 palette shades) and two-layer structure (depths, tints, parallax ranges, wrapping, destroy, revert path)
- Stub `Phaser.Math.Between`/`FloatBetween` in phaser-stub for Node tests
- Update PROJECT_NOTES.md to document the two-layer model, accent derivation, and new tuning knobs
- Nebula gas layer: soft coloured cloud sprites at depth 3, tinted with a
per-system palette color assigned deterministically at galaxy generation
(SystemGenerator stamps content.atmosphere.color). Only nebula-type
systems render it; all other types are untouched.
- Ripple effect: a full-screen WebGL composite on the world camera that
displaces the starfield and world objects while the HUD stays crisp via
a new UI/world camera split (UiCameras.js). Data-driven per archetype in
data/systems.json (nebula = ripple, all others = none). Canvas fallback
degrades to no effect.
- Demo mode: ?fx=<type> URL param retargets the run to the richest system
of that archetype, fully charted with all gates active, for judging the
effect in isolation.
- New ice and lava planet art (slots 9–14 in planets.png) replacing the
placeholder terran/rocky/gas reuse.
- Node test suites for the nebula palette/determinism/cloud texture and
the ripple math/data contract/shader/facade (50+ checks, bare Node).
Brian Fertig