diff --git a/src/analytics.ts b/src/analytics.ts
index b19958a..427f871 100644
--- a/src/analytics.ts
+++ b/src/analytics.ts
@@ -4,9 +4,13 @@ import {
   type PlausibleEventOptions,
 } from '@plausible-analytics/tracker';
 
-import { appConfig } from './config';
 import type { VibeId } from './vibes';
 
+const ANALYTICS_AUTO_CAPTURE_PAGEVIEWS = true;
+const ANALYTICS_DOMAIN = 'schmelczer.dev/fleeting';
+const ANALYTICS_ENDPOINT = 'https://stats.schmelczer.dev/status';
+const ANALYTICS_LOGGING = import.meta.env.DEV;
+
 let isInitialized = false;
 
 const track = (eventName: string, options: PlausibleEventOptions = {}) => {
@@ -24,10 +28,10 @@ export const initAnalytics = () => {
 
   try {
     plausibleInit({
-      domain: appConfig.analytics.domain,
-      endpoint: appConfig.analytics.endpoint,
-      autoCapturePageviews: appConfig.analytics.autoCapturePageviews,
-      logging: appConfig.analytics.logging,
+      domain: ANALYTICS_DOMAIN,
+      endpoint: ANALYTICS_ENDPOINT,
+      autoCapturePageviews: ANALYTICS_AUTO_CAPTURE_PAGEVIEWS,
+      logging: ANALYTICS_LOGGING,
     });
     isInitialized = true;
   } catch (error) {
diff --git a/src/config.ts b/src/config.ts
index 06d2309..37e7f78 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,199 +1,9 @@
-import {
-  createGardenAudioConfig,
-  DEFAULT_AUDIO_VOLUME,
-} from './audio/garden-audio-config';
-import { defaultSettings } from './config/default-settings';
-import { runtimeControls } from './config/runtime-controls';
-import type { GardenAppConfig } from './config/types';
-import { defaultVibeId, vibePresets } from './config/vibe-presets';
-
+export { defaultSettings } from './config/default-settings';
 export {
   normalizeNumberControlValue,
   normalizeRuntimeSettings,
 } from './config/normalize-runtime-settings';
+export { runtimeControls } from './config/runtime-controls';
+export { defaultVibeId, vibePresets } from './config/vibe-presets';
 
-export type {
-  GardenAppConfig,
-  GardenRuntimeSettings,
-  NumberControlConfig,
-} from './config/types';
-
-export const appConfig = {
-  audio: createGardenAudioConfig(),
-  analytics: {
-    autoCapturePageviews: true,
-    domain: 'schmelczer.dev/fleeting',
-    endpoint: 'https://stats.schmelczer.dev/status',
-    logging: import.meta.env.DEV,
-  },
-  deltaTime: {
-    maxDeltaTimeSeconds: 1 / 30,
-    minDeltaTimeSeconds: 1 / 240,
-  },
-  exportSnapshot: {
-    bytesPerPixel: 4,
-    filenameExtension: 'png',
-    filenamePrefix: 'fleeting-garden',
-    filenameSuffix: '-snapshot',
-    mimeType: 'image/png',
-    rowAlignmentBytes: 256,
-  },
-  menuHider: {
-    bottomRevealDistancePx: 96,
-    desktopMediaQuery: '(min-width: 600px) and (hover: hover) and (pointer: fine)',
-    hideDelayMs: 3000,
-  },
-  pipelines: {
-    common: {
-      noiseChannelSeeds: [0, 1, 2, 3],
-      noiseClearValue: { r: 1, g: 1, b: 1, a: 1 },
-      noiseDrawInstanceCount: 1,
-      noiseDrawVertexCount: 3,
-      noiseHashMultiplier: 43758.5453123,
-      noiseHashX: 12.9898,
-      noiseHashY: 78.233,
-      noiseTextureFormat: 'r8unorm',
-      noiseTextureSize: 2048,
-    },
-    brush: {
-      maxLineCount: 240,
-    },
-    diffusion: {
-      minDiffusionRate: 0.000001,
-    },
-    eraser: {
-      maxTextureLineCount: 384,
-    },
-  },
-  defaultSettings,
-  runtimeSettings: {
-    controls: runtimeControls,
-  },
-  simulation: {
-    brushEffectFramesPerSecond: 60,
-    clearColor: { r: 0, g: 0, b: 0, a: 0 },
-    initialAgentCount: 180_000,
-    // How long the source map continues to be diffused after a brush stroke ends.
-    // 600 frames at ~60 FPS ≈ 10 seconds.
-    sourceActiveFramesAfterWrite: 600,
-    intro: {
-      angleJitterRadians: Math.PI * 0.08,
-      angleEaseEnd: 1,
-      angleEaseStart: 0.6,
-      circleMaxSideRatio: 0.46,
-      circleMinSideRatio: 0.32,
-      drawHintDelayMs: 3000,
-      durationSeconds: 4,
-      entryJitterSideRatio: 0.035,
-      fontScaleDown: 0.94,
-      fontFamily: '"Open Sans", sans-serif',
-      initialFontHeightRatio: 0.28,
-      initialFontWidthRatio: 0.19,
-      letterSpacingEm: 0.07,
-      maskAlphaThreshold: 32,
-      maskGradientThreshold: 8,
-      maskMaxPixels: 1_000_000,
-      maskSampleDensity: 540,
-      maxHeightRatio: 0.25,
-      maxWidthRatio: 0.76,
-      minEntryJitterPx: 6,
-      minFontSizePx: 18,
-      minTargetJitterPx: 1,
-      pathEasing: 'easeOutQuad',
-      pathProgressEpsilon: 0.001,
-      radialJitterRatio: 0.35,
-      radialStartEpsilon: 0.001,
-      resizeMinimumRemainingSeconds: 1.4,
-      resizeSettleMs: 120,
-      targetDelayDistanceMultiplier: 0.12,
-      targetDelayMax: 0.22,
-      targetDelayRandomMultiplier: 0.06,
-      targetJitterSideRatio: 0.0035,
-      title: 'Fleeting',
-      titleColorCutLetters: [2, 5],
-      titleRadiusMultiplier: 1.55,
-      titleStrokeWidthMinPx: 6,
-      titleStrokeWidthRatio: 0.11,
-      verticalAnchor: 0.47,
-    },
-    introMoveSpeed: 280,
-    stroke: {
-      densityMultiplier: 110,
-      maxAgentCount: 2_400,
-    },
-  },
-  storage: {
-    audioMutedKey: 'fleeting-garden:audio-muted',
-    audioVolumeKey: 'fleeting-garden:audio-volume',
-    vibeKey: 'fleeting-garden:vibe',
-  },
-  toolbar: {
-    eraser: {
-      controlScaleMax: 1.34,
-      controlScaleMin: 0.74,
-      default: 96,
-      max: 480,
-      min: 24,
-      step: 1,
-    },
-    mirror: {
-      default: 8,
-      fallbackSegmentName: 'slices',
-      max: 12,
-      min: 1,
-      names: {
-        2: 'halves',
-        3: 'thirds',
-        4: 'quarters',
-        5: 'fifths',
-        6: 'sixths',
-        7: 'sevenths',
-        8: 'eighths',
-        9: 'ninths',
-        10: 'tenths',
-        11: 'elevenths',
-        12: 'twelfths',
-      },
-      offLabel: 'Mirror off',
-      step: 1,
-    },
-    contrast: {
-      backgroundOpacityMax: 0.82,
-      brightLuminanceThreshold: 0.32,
-      brightWeight: 0.65,
-      bytesPerSample: 4,
-      contrastOffset: 0.05,
-      linearChannelBreakpoint: 0.03928,
-      linearChannelDivisor: 12.92,
-      linearChannelGamma: 2.4,
-      linearChannelOffset: 0.055,
-      linearChannelScale: 1.055,
-      lowContrastThreshold: 3,
-      lowContrastWeight: 1.8,
-      luminanceBase: 0.11,
-      luminanceBlueWeight: 0.0722,
-      luminanceGreenWeight: 0.7152,
-      luminanceRange: 0.28,
-      luminanceRedWeight: 0.2126,
-      sampleColumns: 13,
-      sampleIntervalMs: 300,
-      sampleRows: 7,
-      whiteContrastNumerator: 1.05,
-    },
-    volume: {
-      default: DEFAULT_AUDIO_VOLUME,
-      max: 1,
-      min: 0,
-      step: 0.01,
-    },
-  },
-  tuningPane: {
-    showFpsOverlay: import.meta.env.DEV,
-    startHidden: true,
-    title: 'Garden Settings',
-  },
-  vibes: {
-    defaultVibeId,
-    presets: vibePresets,
-  },
-} satisfies GardenAppConfig;
+export type { GardenRuntimeSettings, NumberControlConfig } from './config/types';
diff --git a/src/config/default-settings.ts b/src/config/default-settings.ts
index 37ce510..ba59a1e 100644
--- a/src/config/default-settings.ts
+++ b/src/config/default-settings.ts
@@ -1,5 +1,5 @@
 import { INTERNAL_RENDER_AREA_MEGAPIXEL_LIMITS } from './runtime-setting-bounds';
-import type { GardenAppConfig } from './types';
+import type { GardenDefaultSettings } from './types';
 
 // Mirrors the historical render-scale cap so the default render area stays
 // roughly equivalent to native rendering on high-DPR phones without the
@@ -21,7 +21,7 @@ const computeDefaultInternalRenderAreaMegapixels = (): number => {
   );
 };
 
-export const defaultSettings: GardenAppConfig['defaultSettings'] = {
+export const defaultSettings: GardenDefaultSettings = {
   selectedColorIndex: 0,
 
   introNearDistanceMin: 28,
diff --git a/src/config/normalize-runtime-settings.ts b/src/config/normalize-runtime-settings.ts
index ec4dcf5..60cbf38 100644
--- a/src/config/normalize-runtime-settings.ts
+++ b/src/config/normalize-runtime-settings.ts
@@ -1,11 +1,9 @@
 import type {
-  GardenAppConfig,
   GardenRuntimeSettings,
   NumberControlConfig,
+  RuntimeSettingControlConfig,
 } from './types';
 
-type RuntimeSettingControls = GardenAppConfig['runtimeSettings']['controls'];
-
 export const normalizeNumberControlValue = (
   value: number,
   config: NumberControlConfig
@@ -28,7 +26,7 @@ export const normalizeNumberControlValue = (
 
 export const normalizeRuntimeSettings = (
   settings: GardenRuntimeSettings,
-  controls: RuntimeSettingControls
+  controls: RuntimeSettingControlConfig
 ): GardenRuntimeSettings => {
   const normalized = { ...settings };
 
diff --git a/src/config/runtime-controls.ts b/src/config/runtime-controls.ts
index e6b8a70..463735a 100644
--- a/src/config/runtime-controls.ts
+++ b/src/config/runtime-controls.ts
@@ -1,6 +1,6 @@
 import { colorInteractionControl } from './color-interactions';
 import { INTERNAL_RENDER_AREA_MEGAPIXEL_LIMITS } from './runtime-setting-bounds';
-import type { GardenAppConfig } from './types';
+import type { RuntimeSettingControlConfig } from './types';
 
 const formatPercent = (value: number): string => `${Math.round(value * 100)}%`;
 const formatRadiansAsDegrees = (value: number): string =>
@@ -16,7 +16,7 @@ const formatCompactNumber = (value: number): string => {
   return `${value}`;
 };
 
-export const runtimeControls: GardenAppConfig['runtimeSettings']['controls'] = {
+export const runtimeControls: RuntimeSettingControlConfig = {
   color1ToColor1: colorInteractionControl('Color 1 Follows Color 1'),
   color1ToColor2: colorInteractionControl('Color 1 Follows Color 2'),
   color1ToColor3: colorInteractionControl('Color 1 Follows Color 3'),
diff --git a/src/config/types.ts b/src/config/types.ts
index 6f9aa29..cd94c9a 100644
--- a/src/config/types.ts
+++ b/src/config/types.ts
@@ -1,7 +1,4 @@
-import type {
-  GardenAudioConfig,
-  GardenAudioVibeSettings,
-} from '../audio/garden-audio-config';
+import type { GardenAudioVibeSettings } from '../audio/garden-audio-config';
 import type { AgentSettings } from '../pipelines/agents/agent-pipeline';
 import type { BrushSettings } from '../pipelines/brush/brush-pipeline';
 import type { DiffusionSettings } from '../pipelines/diffusion/diffusion-pipeline';
@@ -49,7 +46,7 @@ export type GardenRuntimeSettings = {
   DiffusionSettings &
   RenderSettings;
 
-type RuntimeSettingControlConfig = Partial<
+export type RuntimeSettingControlConfig = Partial<
   Record<keyof GardenRuntimeSettings, NumberControlConfig>
 >;
 
@@ -79,7 +76,7 @@ export type GardenVibeSettings = Pick<
   | 'turnWhenLost'
 >;
 
-type GardenDefaultSettings = Omit<
+export type GardenDefaultSettings = Omit<
   GardenRuntimeSettings,
   keyof GardenVibeSettings | 'eraserSize' | 'mirrorSegmentCount'
 >;
@@ -101,169 +98,3 @@ export interface VibePreset {
   settings: GardenVibeSettings;
   audio: GardenAudioVibeSettings;
 }
-
-export interface GardenAppConfig {
-  audio: GardenAudioConfig;
-  analytics: {
-    autoCapturePageviews: boolean;
-    domain: string;
-    endpoint: string;
-    logging: boolean;
-  };
-  deltaTime: {
-    maxDeltaTimeSeconds: number;
-    minDeltaTimeSeconds: number;
-  };
-  exportSnapshot: {
-    bytesPerPixel: number;
-    filenameExtension: string;
-    filenamePrefix: string;
-    filenameSuffix: string;
-    mimeType: string;
-    rowAlignmentBytes: number;
-  };
-  menuHider: {
-    bottomRevealDistancePx: number;
-    desktopMediaQuery: string;
-    hideDelayMs: number;
-  };
-  pipelines: {
-    common: {
-      noiseChannelSeeds: [number, number, number, number];
-      noiseClearValue: GPUColor;
-      noiseDrawInstanceCount: number;
-      noiseDrawVertexCount: number;
-      noiseHashMultiplier: number;
-      noiseHashX: number;
-      noiseHashY: number;
-      noiseTextureFormat: GPUTextureFormat;
-      noiseTextureSize: number;
-    };
-    brush: {
-      maxLineCount: number;
-    };
-    diffusion: {
-      minDiffusionRate: number;
-    };
-    eraser: {
-      maxTextureLineCount: number;
-    };
-  };
-  defaultSettings: GardenDefaultSettings;
-  runtimeSettings: {
-    controls: RuntimeSettingControlConfig;
-  };
-  simulation: {
-    brushEffectFramesPerSecond: number;
-    clearColor: GPUColor;
-    initialAgentCount: number;
-    sourceActiveFramesAfterWrite: number;
-    intro: {
-      angleJitterRadians: number;
-      angleEaseEnd: number;
-      angleEaseStart: number;
-      circleMaxSideRatio: number;
-      circleMinSideRatio: number;
-      drawHintDelayMs: number;
-      durationSeconds: number;
-      entryJitterSideRatio: number;
-      fontScaleDown: number;
-      fontFamily: string;
-      initialFontHeightRatio: number;
-      initialFontWidthRatio: number;
-      letterSpacingEm: number;
-      maskAlphaThreshold: number;
-      maskGradientThreshold: number;
-      maskMaxPixels: number;
-      maskSampleDensity: number;
-      maxHeightRatio: number;
-      maxWidthRatio: number;
-      minEntryJitterPx: number;
-      minFontSizePx: number;
-      minTargetJitterPx: number;
-      pathEasing: 'easeOutQuad' | 'linear';
-      pathProgressEpsilon: number;
-      radialJitterRatio: number;
-      radialStartEpsilon: number;
-      resizeMinimumRemainingSeconds: number;
-      resizeSettleMs: number;
-      targetDelayDistanceMultiplier: number;
-      targetDelayMax: number;
-      targetDelayRandomMultiplier: number;
-      targetJitterSideRatio: number;
-      title: string;
-      titleColorCutLetters: [number, number];
-      titleRadiusMultiplier: number;
-      titleStrokeWidthMinPx: number;
-      titleStrokeWidthRatio: number;
-      verticalAnchor: number;
-    };
-    introMoveSpeed: number;
-    stroke: {
-      densityMultiplier: number;
-      maxAgentCount: number;
-    };
-  };
-  storage: {
-    audioMutedKey: string;
-    audioVolumeKey: string;
-    vibeKey: string;
-  };
-  toolbar: {
-    eraser: {
-      controlScaleMax: number;
-      controlScaleMin: number;
-      default: number;
-      max: number;
-      min: number;
-      step: number;
-    };
-    mirror: {
-      default: number;
-      fallbackSegmentName: string;
-      max: number;
-      min: number;
-      names: Record<number, string>;
-      offLabel: string;
-      step: number;
-    };
-    contrast: {
-      backgroundOpacityMax: number;
-      brightLuminanceThreshold: number;
-      brightWeight: number;
-      bytesPerSample: number;
-      contrastOffset: number;
-      linearChannelBreakpoint: number;
-      linearChannelDivisor: number;
-      linearChannelGamma: number;
-      linearChannelOffset: number;
-      linearChannelScale: number;
-      lowContrastThreshold: number;
-      lowContrastWeight: number;
-      luminanceBase: number;
-      luminanceBlueWeight: number;
-      luminanceGreenWeight: number;
-      luminanceRange: number;
-      luminanceRedWeight: number;
-      sampleColumns: number;
-      sampleIntervalMs: number;
-      sampleRows: number;
-      whiteContrastNumerator: number;
-    };
-    volume: {
-      default: number;
-      max: number;
-      min: number;
-      step: number;
-    };
-  };
-  tuningPane: {
-    showFpsOverlay: boolean;
-    startHidden: boolean;
-    title: string;
-  };
-  vibes: {
-    defaultVibeId: VibeId;
-    presets: Array<VibePreset>;
-  };
-}
diff --git a/src/game-loop/agent-population.test.ts b/src/game-loop/agent-population.test.ts
index 2bc0e26..7232781 100644
--- a/src/game-loop/agent-population.test.ts
+++ b/src/game-loop/agent-population.test.ts
@@ -1,11 +1,14 @@
 import { vec2 } from 'gl-matrix';
 import { afterEach, beforeEach, describe, expect, it } from 'vitest';
 
-import { appConfig } from '../config';
 import { type AgentGenerationPipeline } from '../pipelines/agents/agent-generation/agent-generation-pipeline';
 import { AGENT_FLOAT_COUNT } from '../pipelines/agents/agent-limits';
 import { settings } from '../settings';
-import { AgentPopulation } from './agent-population';
+import {
+  AgentPopulation,
+  STROKE_AGENT_BATCH_CAPACITY,
+  STROKE_DENSITY_MULTIPLIER,
+} from './agent-population';
 import { type FramePerformance } from './frame-performance';
 
 const originalSettings = {
@@ -70,7 +73,7 @@ const createPopulation = (): {
 };
 
 const setSpawnRate = (agentsPerPixel: number): void => {
-  settings.spawnPerPixel = agentsPerPixel / appConfig.simulation.stroke.densityMultiplier;
+  settings.spawnPerPixel = agentsPerPixel / STROKE_DENSITY_MULTIPLIER;
 };
 
 describe('AgentPopulation stroke spawning', () => {
@@ -124,7 +127,7 @@ describe('AgentPopulation stroke spawning', () => {
 
   it('chunks long stroke writes without clipping length-linear spawn counts', () => {
     const { pipeline, population } = createPopulation();
-    const batchCapacity = appConfig.simulation.stroke.maxAgentCount;
+    const batchCapacity = STROKE_AGENT_BATCH_CAPACITY;
     const expectedAgentCount = batchCapacity + 10;
 
     population.spawnStrokeAgents(
diff --git a/src/game-loop/agent-population.ts b/src/game-loop/agent-population.ts
index 1d0390f..019a74f 100644
--- a/src/game-loop/agent-population.ts
+++ b/src/game-loop/agent-population.ts
@@ -1,6 +1,5 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig } from '../config';
 import { getRenderQualityBrushSize } from '../config/brush-size';
 import { AgentGenerationPipeline } from '../pipelines/agents/agent-generation/agent-generation-pipeline';
 import { AGENT_FLOAT_COUNT, writeAgentValues } from '../pipelines/agents/agent-limits';
@@ -9,6 +8,11 @@ import { settings } from '../settings';
 import type { FramePerformance } from './frame-performance';
 import { createIntroTitleAgents } from './intro-title-agents';
 
+export const STROKE_AGENT_BATCH_CAPACITY = 2_400;
+export const STROKE_DENSITY_MULTIPLIER = 110;
+
+const INITIAL_INTRO_AGENT_COUNT = 180_000;
+
 export class AgentPopulation {
   private activeCount = 0;
   // Current performance-aware limit; new agents above it replace old agents.
@@ -22,7 +26,7 @@ export class AgentPopulation {
   private readonly queuedAgentBatches: Array<Float32Array> = [];
   private pendingStrokeAgentCount = 0;
   private readonly strokeAgentData = new Float32Array(
-    appConfig.simulation.stroke.maxAgentCount * AGENT_FLOAT_COUNT
+    STROKE_AGENT_BATCH_CAPACITY * AGENT_FLOAT_COUNT
   );
 
   public constructor(
@@ -46,10 +50,7 @@ export class AgentPopulation {
 
   public replaceIntroAgents(canvasSize: vec2, progress: number): void {
     this.adaptiveCap = this.clampAndEnsureAdaptiveCap(this.adaptiveCap);
-    const introAgentCount = Math.min(
-      this.adaptiveCap,
-      appConfig.simulation.initialAgentCount
-    );
+    const introAgentCount = Math.min(this.adaptiveCap, INITIAL_INTRO_AGENT_COUNT);
     const data = createIntroTitleAgents({
       count: introAgentCount,
       width: canvasSize[0],
@@ -332,8 +333,5 @@ const getStrokeSpawnRate = (): number => {
   const spawnPerPixel = Number.isFinite(settings.spawnPerPixel)
     ? settings.spawnPerPixel
     : 0;
-  const densityMultiplier = Number.isFinite(appConfig.simulation.stroke.densityMultiplier)
-    ? appConfig.simulation.stroke.densityMultiplier
-    : 0;
-  return Math.max(0, spawnPerPixel * densityMultiplier);
+  return Math.max(0, spawnPerPixel * STROKE_DENSITY_MULTIPLIER);
 };
diff --git a/src/game-loop/brush-stroke-smoother.ts b/src/game-loop/brush-stroke-smoother.ts
index 3d45283..918b95c 100644
--- a/src/game-loop/brush-stroke-smoother.ts
+++ b/src/game-loop/brush-stroke-smoother.ts
@@ -1,6 +1,6 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig } from '../config';
+import { defaultSettings } from '../config';
 import { getRenderQualityBrushSize } from '../config/brush-size';
 import { getSafePixelRatio } from '../pipelines/brush/brush-pipeline';
 import { settings } from '../settings';
@@ -143,13 +143,13 @@ const getQuadraticPoint = (start: vec2, control: vec2, end: vec2, t: number): ve
 const getBrushCurveResolution = (): number => {
   const resolution = Number.isFinite(settings.brushCurveResolution)
     ? settings.brushCurveResolution
-    : appConfig.defaultSettings.brushCurveResolution;
+    : defaultSettings.brushCurveResolution;
   return Math.max(1, Math.floor(resolution));
 };
 
 const getBrushSmoothingDistanceSquared = (pixelRatio?: number): number => {
   const distance = Number.isFinite(settings.brushSmoothingMinSampleDistance)
     ? settings.brushSmoothingMinSampleDistance
-    : appConfig.defaultSettings.brushSmoothingMinSampleDistance;
+    : defaultSettings.brushSmoothingMinSampleDistance;
   return Math.max(0, distance * getSafePixelRatio(pixelRatio)) ** 2;
 };
diff --git a/src/game-loop/export-snapshot-renderer.ts b/src/game-loop/export-snapshot-renderer.ts
index 0be8911..db675cc 100644
--- a/src/game-loop/export-snapshot-renderer.ts
+++ b/src/game-loop/export-snapshot-renderer.ts
@@ -1,7 +1,13 @@
-import { appConfig } from '../config';
 import { RenderPipeline } from '../pipelines/render/render-pipeline';
 import type { VibeId } from '../vibes';
 
+const SNAPSHOT_BYTES_PER_PIXEL = 4;
+const SNAPSHOT_FILENAME_EXTENSION = 'png';
+const SNAPSHOT_FILENAME_PREFIX = 'fleeting-garden';
+const SNAPSHOT_FILENAME_SUFFIX = '-snapshot';
+const SNAPSHOT_MIME_TYPE = 'image/png';
+const SNAPSHOT_ROW_ALIGNMENT_BYTES = 256;
+
 interface ExportSnapshotRendererOptions {
   device: GPUDevice;
   renderPipeline: RenderPipeline;
@@ -121,15 +127,15 @@ export class ExportSnapshotRenderer {
 
     context.putImageData(new ImageData(pixels, width, height), 0, 0);
     const blob = await canvas.convertToBlob({
-      type: appConfig.exportSnapshot.mimeType,
+      type: SNAPSHOT_MIME_TYPE,
     });
     const link = document.createElement('a');
     const objectUrl = URL.createObjectURL(blob);
     try {
       link.href = objectUrl;
-      link.download = `${appConfig.exportSnapshot.filenamePrefix}_${this.options.getVibeId()}_${
+      link.download = `${SNAPSHOT_FILENAME_PREFIX}_${this.options.getVibeId()}_${
         this.options.seed
-      }_${width}x${height}${appConfig.exportSnapshot.filenameSuffix}.${appConfig.exportSnapshot.filenameExtension}`;
+      }_${width}x${height}${SNAPSHOT_FILENAME_SUFFIX}.${SNAPSHOT_FILENAME_EXTENSION}`;
       link.click();
     } finally {
       URL.revokeObjectURL(objectUrl);
@@ -154,11 +160,8 @@ const getSnapshotDimension = (value: number): number =>
 const getSnapshotLayout = (sourceWidth: number, sourceHeight: number): SnapshotLayout => {
   const width = getSnapshotDimension(sourceWidth);
   const height = getSnapshotDimension(sourceHeight);
-  const unpaddedBytesPerRow = width * appConfig.exportSnapshot.bytesPerPixel;
-  const bytesPerRow = alignTo(
-    unpaddedBytesPerRow,
-    appConfig.exportSnapshot.rowAlignmentBytes
-  );
+  const unpaddedBytesPerRow = width * SNAPSHOT_BYTES_PER_PIXEL;
+  const bytesPerRow = alignTo(unpaddedBytesPerRow, SNAPSHOT_ROW_ALIGNMENT_BYTES);
 
   return {
     width,
@@ -191,8 +194,8 @@ const readSnapshotPixels = ({
     const sourceOffset = y * bytesPerRow;
     const targetOffset = y * unpaddedBytesPerRow;
     for (let x = 0; x < width; x++) {
-      const source = sourceOffset + x * appConfig.exportSnapshot.bytesPerPixel;
-      const target = targetOffset + x * appConfig.exportSnapshot.bytesPerPixel;
+      const source = sourceOffset + x * SNAPSHOT_BYTES_PER_PIXEL;
+      const target = targetOffset + x * SNAPSHOT_BYTES_PER_PIXEL;
       pixels[target] = isBgra ? mapped[source + 2] : mapped[source];
       pixels[target + 1] = mapped[source + 1];
       pixels[target + 2] = isBgra ? mapped[source] : mapped[source + 2];
diff --git a/src/game-loop/game-loop-resources.ts b/src/game-loop/game-loop-resources.ts
index 64c9680..a380c23 100644
--- a/src/game-loop/game-loop-resources.ts
+++ b/src/game-loop/game-loop-resources.ts
@@ -1,6 +1,6 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig, type GardenRuntimeSettings } from '../config';
+import { type GardenRuntimeSettings } from '../config';
 import { AgentGenerationPipeline } from '../pipelines/agents/agent-generation/agent-generation-pipeline';
 import { AgentPipeline } from '../pipelines/agents/agent-pipeline';
 import { BrushPipeline } from '../pipelines/brush/brush-pipeline';
@@ -12,9 +12,12 @@ import { RenderPipeline } from '../pipelines/render/render-pipeline';
 import { initializeContext } from '../utils/graphics/initialize-context';
 import { CanvasReadbackRequest, RenderInputs } from './game-loop-types';
 import { GpuProfiler } from './gpu-profiler';
+import { perfStatsOverlayState } from './perf-stats-overlay';
 import { SimulationFrameRenderer } from './simulation-frame';
 import { SimulationTextures } from './simulation-textures';
 
+const INTRO_MOVE_SPEED = 280;
+
 interface FrameParameters extends RenderInputs {
   time: number;
   deltaTime: number;
@@ -78,7 +81,7 @@ export class GameLoopResources {
     this.renderPipeline = new RenderPipeline(context, this.device, this.canvasFormat);
     this.gpuProfiler = GpuProfiler.create(
       this.device,
-      () => appConfig.tuningPane.showFpsOverlay
+      () => perfStatsOverlayState.isVisible
     );
 
     this.frameRenderer = new SimulationFrameRenderer(
@@ -134,7 +137,7 @@ export class GameLoopResources {
       deltaTime,
       time,
       agentCount: activeAgentCount,
-      introMoveSpeed: appConfig.simulation.introMoveSpeed,
+      introMoveSpeed: INTRO_MOVE_SPEED,
       introProgress,
     });
     this.brushPipeline.setParameters({
diff --git a/src/game-loop/game-loop.ts b/src/game-loop/game-loop.ts
index aed5289..25d2323 100644
--- a/src/game-loop/game-loop.ts
+++ b/src/game-loop/game-loop.ts
@@ -1,7 +1,7 @@
 import { vec2 } from 'gl-matrix';
 
 import { GardenAudio } from '../audio/garden-audio';
-import { appConfig } from '../config';
+import { createGardenAudioConfig } from '../audio/garden-audio-config';
 import { activeVibe, settings } from '../settings';
 import { DeltaTimeCalculator } from '../utils/delta-time-calculator';
 import { rgbColorToCss, type RgbColor } from '../utils/rgb-color';
@@ -13,14 +13,19 @@ import { GameLoopResources } from './game-loop-resources';
 import { GardenUi } from './game-loop-types';
 import { getInternalRenderSize } from './internal-render-size';
 import { IntroPrompt } from './intro-prompt';
-import { PerfStatsOverlay } from './perf-stats-overlay';
+import { PerfStatsOverlay, perfStatsOverlayState } from './perf-stats-overlay';
 import { GardenPointerInput } from './pointer-input';
+import { MAX_MIRROR_SEGMENT_COUNT, MIN_MIRROR_SEGMENT_COUNT } from './stroke-mirroring';
 import { PipelineStrokeOutput } from './stroke-output';
 import { ToolbarContrastMonitor } from './toolbar-contrast-monitor';
 
+const INTRO_RESIZE_SETTLE_MS = 120;
+const INTRO_RESIZE_MINIMUM_REMAINING_SECONDS = 1.4;
+const GARDEN_AUDIO_CONFIG = createGardenAudioConfig();
+
 export default class GameLoop {
   private readonly resources: GameLoopResources;
-  private readonly audio = new GardenAudio(appConfig.audio);
+  private readonly audio = new GardenAudio(GARDEN_AUDIO_CONFIG);
   private readonly introPrompt: IntroPrompt;
   private readonly eraserPreview: EraserPreview;
   private readonly pointerInput: GardenPointerInput;
@@ -250,7 +255,7 @@ export default class GameLoop {
   };
 
   private syncPerfStatsOverlay(): void {
-    if (appConfig.tuningPane.showFpsOverlay) {
+    if (perfStatsOverlayState.isVisible) {
       this.perfStatsOverlay ??= new PerfStatsOverlay(
         this.canvas.parentElement ?? document.body
       );
@@ -323,13 +328,11 @@ export default class GameLoop {
       return;
     }
 
-    if (time - this.pendingIntroResizeAt < appConfig.simulation.intro.resizeSettleMs) {
+    if (time - this.pendingIntroResizeAt < INTRO_RESIZE_SETTLE_MS) {
       return;
     }
 
-    this.introPrompt.rewindToLeaveRemainingTime(
-      appConfig.simulation.intro.resizeMinimumRemainingSeconds
-    );
+    this.introPrompt.rewindToLeaveRemainingTime(INTRO_RESIZE_MINIMUM_REMAINING_SECONDS);
     this.resources.clearSimulation();
     this.agentPopulation.replaceIntroAgents(this.canvasSize, this.introPrompt.progress);
     this.pendingIntroResizeAt = null;
@@ -351,10 +354,10 @@ export default class GameLoop {
   private get mirrorSegmentCount(): number {
     const count = Number.isFinite(settings.mirrorSegmentCount)
       ? settings.mirrorSegmentCount
-      : appConfig.toolbar.mirror.min;
+      : MIN_MIRROR_SEGMENT_COUNT;
     return Math.min(
-      appConfig.toolbar.mirror.max,
-      Math.max(appConfig.toolbar.mirror.min, Math.round(count))
+      MAX_MIRROR_SEGMENT_COUNT,
+      Math.max(MIN_MIRROR_SEGMENT_COUNT, Math.round(count))
     );
   }
 
diff --git a/src/game-loop/intro-prompt.ts b/src/game-loop/intro-prompt.ts
index cd9468d..483f7f0 100644
--- a/src/game-loop/intro-prompt.ts
+++ b/src/game-loop/intro-prompt.ts
@@ -1,6 +1,6 @@
-import { appConfig } from '../config';
-
 const DRAW_HINT_CLASS = 'draw-hint';
+const INTRO_DURATION_SECONDS = 4;
+const DRAW_HINT_DELAY_MS = 3000;
 
 export class IntroPrompt {
   private introComplete = false;
@@ -13,10 +13,7 @@ export class IntroPrompt {
   public get progress(): number {
     return this.introComplete
       ? 1
-      : Math.min(
-          1,
-          this.introElapsedSeconds / appConfig.simulation.intro.durationSeconds
-        );
+      : Math.min(1, this.introElapsedSeconds / INTRO_DURATION_SECONDS);
   }
 
   public get shouldRegenerateTitleOnResize(): boolean {
@@ -33,7 +30,7 @@ export class IntroPrompt {
       : 0;
     this.introElapsedSeconds = Math.min(
       this.introElapsedSeconds,
-      Math.max(0, appConfig.simulation.intro.durationSeconds - safeRemainingSeconds)
+      Math.max(0, INTRO_DURATION_SECONDS - safeRemainingSeconds)
     );
   }
 
@@ -45,10 +42,7 @@ export class IntroPrompt {
       this.introElapsedSeconds += safeDeltaTime;
     }
 
-    if (
-      !this.introComplete &&
-      this.introElapsedSeconds >= appConfig.simulation.intro.durationSeconds
-    ) {
+    if (!this.introComplete && this.introElapsedSeconds >= INTRO_DURATION_SECONDS) {
       this.complete(now);
     }
 
@@ -56,7 +50,7 @@ export class IntroPrompt {
       !this.introComplete ||
       this.hasStartedDrawing ||
       this.introCompletedAt === null ||
-      now - this.introCompletedAt < appConfig.simulation.intro.drawHintDelayMs
+      now - this.introCompletedAt < DRAW_HINT_DELAY_MS
     ) {
       return;
     }
diff --git a/src/game-loop/intro-title-agents.ts b/src/game-loop/intro-title-agents.ts
index a34bbf4..168c106 100644
--- a/src/game-loop/intro-title-agents.ts
+++ b/src/game-loop/intro-title-agents.ts
@@ -1,4 +1,3 @@
-import { appConfig, type GardenAppConfig } from '../config';
 import { AGENT_FLOAT_COUNT, writeAgentValues } from '../pipelines/agents/agent-limits';
 import { clamp, easeOutQuad, mix, mixAngle, smoothstep } from '../utils/math';
 
@@ -18,9 +17,43 @@ interface IntroTitleAgentOptions {
 }
 
 type RandomSource = () => number;
-type IntroPathEasing = GardenAppConfig['simulation']['intro']['pathEasing'];
+type IntroPathEasing = 'easeOutQuad' | 'linear';
+
+const INTRO_TITLE = 'Fleeting';
+const INTRO_ANGLE_JITTER_RADIANS = Math.PI * 0.08;
+const INTRO_ANGLE_EASE_START = 0.6;
+const INTRO_ANGLE_EASE_END = 1;
+const INTRO_CIRCLE_MIN_SIDE_RATIO = 0.32;
+const INTRO_CIRCLE_MAX_SIDE_RATIO = 0.46;
+const INTRO_ENTRY_JITTER_SIDE_RATIO = 0.035;
+const INTRO_FONT_FAMILY = '"Open Sans", sans-serif';
+const INTRO_FONT_SCALE_DOWN = 0.94;
+const INTRO_INITIAL_FONT_HEIGHT_RATIO = 0.28;
+const INTRO_INITIAL_FONT_WIDTH_RATIO = 0.19;
+const INTRO_LETTER_SPACING_EM = 0.07;
+const INTRO_MASK_ALPHA_THRESHOLD = 32;
+const INTRO_MASK_GRADIENT_THRESHOLD = 8;
+const INTRO_MASK_MAX_PIXELS = 1_000_000;
+const INTRO_MASK_SAMPLE_DENSITY = 540;
+const INTRO_MAX_HEIGHT_RATIO = 0.25;
+const INTRO_MAX_WIDTH_RATIO = 0.76;
+const INTRO_MIN_ENTRY_JITTER_PX = 6;
+const INTRO_MIN_FONT_SIZE_PX = 18;
+const INTRO_MIN_TARGET_JITTER_PX = 1;
+const INTRO_PATH_EASING: IntroPathEasing = 'easeOutQuad';
+const INTRO_PATH_PROGRESS_EPSILON = 0.001;
+const INTRO_RADIAL_JITTER_RATIO = 0.35;
+const INTRO_RADIAL_START_EPSILON = 0.001;
+const INTRO_TARGET_DELAY_DISTANCE_MULTIPLIER = 0.12;
+const INTRO_TARGET_DELAY_MAX = 0.22;
+const INTRO_TARGET_DELAY_RANDOM_MULTIPLIER = 0.06;
+const INTRO_TARGET_JITTER_SIDE_RATIO = 0.0035;
+const INTRO_TITLE_COLOR_CUT_LETTERS = [2, 5] as const;
+const INTRO_TITLE_RADIUS_MULTIPLIER = 1.55;
+const INTRO_TITLE_STROKE_WIDTH_MIN_PX = 6;
+const INTRO_TITLE_STROKE_WIDTH_RATIO = 0.11;
+const INTRO_VERTICAL_ANCHOR = 0.47;
 
-const INTRO_TITLE = appConfig.simulation.intro.title;
 const isLinearPathEasing = (pathEasing: IntroPathEasing): boolean =>
   pathEasing === 'linear';
 
@@ -47,30 +80,27 @@ export const createIntroTitleAgents = ({
   const data = new Float32Array(count * AGENT_FLOAT_COUNT);
   const minSide = Math.min(safeWidth, safeHeight);
   const targetJitter = Math.max(
-    appConfig.simulation.intro.minTargetJitterPx,
-    minSide * appConfig.simulation.intro.targetJitterSideRatio
+    INTRO_MIN_TARGET_JITTER_PX,
+    minSide * INTRO_TARGET_JITTER_SIDE_RATIO
   );
   const entryJitter = Math.max(
-    appConfig.simulation.intro.minEntryJitterPx,
-    minSide * appConfig.simulation.intro.entryJitterSideRatio
+    INTRO_MIN_ENTRY_JITTER_PX,
+    minSide * INTRO_ENTRY_JITTER_SIDE_RATIO
   );
   const titleRadius = points.reduce(
     (radius, point) =>
       Math.max(
         radius,
-        Math.hypot(
-          point.x - safeWidth / 2,
-          point.y - safeHeight * appConfig.simulation.intro.verticalAnchor
-        )
+        Math.hypot(point.x - safeWidth / 2, point.y - safeHeight * INTRO_VERTICAL_ANCHOR)
       ),
     0
   );
   const introCircleRadius = Math.min(
     Math.max(
-      titleRadius * appConfig.simulation.intro.titleRadiusMultiplier,
-      minSide * appConfig.simulation.intro.circleMinSideRatio
+      titleRadius * INTRO_TITLE_RADIUS_MULTIPLIER,
+      minSide * INTRO_CIRCLE_MIN_SIDE_RATIO
     ),
-    minSide * appConfig.simulation.intro.circleMaxSideRatio
+    minSide * INTRO_CIRCLE_MAX_SIDE_RATIO
   );
 
   for (let i = 0; i < count; i++) {
@@ -101,21 +131,16 @@ export const createIntroTitleAgents = ({
     const distanceFraction =
       Math.hypot(targetX - startX, targetY - startY) / Math.hypot(safeWidth, safeHeight);
     const introDelay = Math.min(
-      appConfig.simulation.intro.targetDelayMax,
-      distanceFraction * appConfig.simulation.intro.targetDelayDistanceMultiplier +
-        random() * appConfig.simulation.intro.targetDelayRandomMultiplier
+      INTRO_TARGET_DELAY_MAX,
+      distanceFraction * INTRO_TARGET_DELAY_DISTANCE_MULTIPLIER +
+        random() * INTRO_TARGET_DELAY_RANDOM_MULTIPLIER
     );
     const pathProgress = getIntroAgentPathProgress(introProgress, introDelay);
-    const initialAngle =
-      approachAngle + (random() - 0.5) * appConfig.simulation.intro.angleJitterRadians;
+    const initialAngle = approachAngle + (random() - 0.5) * INTRO_ANGLE_JITTER_RADIANS;
     const currentAngle = mixAngle(
       initialAngle,
       targetAngle,
-      smoothstep(
-        appConfig.simulation.intro.angleEaseStart,
-        appConfig.simulation.intro.angleEaseEnd,
-        pathProgress
-      )
+      smoothstep(INTRO_ANGLE_EASE_START, INTRO_ANGLE_EASE_END, pathProgress)
     );
     writeAgentValues(data, i, {
       positionX: mix(startX, targetX, pathProgress),
@@ -142,12 +167,12 @@ const getIntroRadialStart = (
   random: RandomSource
 ): [number, number] => {
   const centerX = width / 2;
-  const centerY = height * appConfig.simulation.intro.verticalAnchor;
+  const centerY = height * INTRO_VERTICAL_ANCHOR;
   const offsetX = targetX - centerX;
   const offsetY = targetY - centerY;
   const length = Math.hypot(offsetX, offsetY);
   const angle =
-    length > appConfig.simulation.intro.radialStartEpsilon
+    length > INTRO_RADIAL_START_EPSILON
       ? Math.atan2(offsetY, offsetX)
       : random() * Math.PI * 2;
   const directionX = Math.cos(angle);
@@ -155,8 +180,7 @@ const getIntroRadialStart = (
   const tangentX = -directionY;
   const tangentY = directionX;
   const tangentJitter = (random() - 0.5) * jitter;
-  const radialJitter =
-    (random() - 0.5) * jitter * appConfig.simulation.intro.radialJitterRatio;
+  const radialJitter = (random() - 0.5) * jitter * INTRO_RADIAL_JITTER_RATIO;
   const startX =
     centerX + directionX * (radius + radialJitter) + tangentX * tangentJitter;
   const startY =
@@ -172,7 +196,7 @@ const createIntroTitlePoints = (
   width: number,
   height: number
 ): Array<IntroTitlePoint> => {
-  const safeMaxPixels = Math.max(1, appConfig.simulation.intro.maskMaxPixels);
+  const safeMaxPixels = Math.max(1, INTRO_MASK_MAX_PIXELS);
   const maskScale = Math.min(1, Math.sqrt(safeMaxPixels / Math.max(1, width * height)));
   const maskWidth = Math.max(1, Math.round(width * maskScale));
   const maskHeight = Math.max(1, Math.round(height * maskScale));
@@ -188,28 +212,28 @@ const createIntroTitlePoints = (
 
   const fontSize = getIntroTitleFontSize(context, maskWidth, maskHeight);
   context.clearRect(0, 0, maskWidth, maskHeight);
-  context.font = `${fontSize}px ${appConfig.simulation.intro.fontFamily}`;
+  context.font = `${fontSize}px ${INTRO_FONT_FAMILY}`;
   context.textAlign = 'center';
   context.textBaseline = 'middle';
   context.fillStyle = '#fff';
   context.strokeStyle = '#fff';
   context.lineJoin = 'round';
   context.lineWidth = Math.max(
-    appConfig.simulation.intro.titleStrokeWidthMinPx,
-    fontSize * appConfig.simulation.intro.titleStrokeWidthRatio
+    INTRO_TITLE_STROKE_WIDTH_MIN_PX,
+    fontSize * INTRO_TITLE_STROKE_WIDTH_RATIO
   );
-  const letterSpacing = fontSize * appConfig.simulation.intro.letterSpacingEm;
+  const letterSpacing = fontSize * INTRO_LETTER_SPACING_EM;
   drawIntroTitleText(
     context,
     maskWidth / 2,
-    maskHeight * appConfig.simulation.intro.verticalAnchor,
+    maskHeight * INTRO_VERTICAL_ANCHOR,
     letterSpacing,
     'stroke'
   );
   drawIntroTitleText(
     context,
     maskWidth / 2,
-    maskHeight * appConfig.simulation.intro.verticalAnchor,
+    maskHeight * INTRO_VERTICAL_ANCHOR,
     letterSpacing,
     'fill'
   );
@@ -217,9 +241,7 @@ const createIntroTitlePoints = (
   const { data } = context.getImageData(0, 0, maskWidth, maskHeight);
   const step = Math.max(
     1,
-    Math.floor(
-      Math.min(maskWidth, maskHeight) / appConfig.simulation.intro.maskSampleDensity
-    )
+    Math.floor(Math.min(maskWidth, maskHeight) / INTRO_MASK_SAMPLE_DENSITY)
   );
   const points: Array<IntroTitlePoint> = [];
   const characterColorBoundaries = getIntroTitleColorBoundaries(
@@ -231,7 +253,7 @@ const createIntroTitlePoints = (
   for (let y = 0; y < maskHeight; y += step) {
     for (let x = 0; x < maskWidth; x += step) {
       const alpha = getMaskAlpha(data, maskWidth, maskHeight, x, y);
-      if (alpha < appConfig.simulation.intro.maskAlphaThreshold) {
+      if (alpha < INTRO_MASK_ALPHA_THRESHOLD) {
         continue;
       }
 
@@ -255,9 +277,9 @@ const getIntroTitleColorBoundaries = (
   const letters = Array.from(INTRO_TITLE);
   const totalWidth = measureIntroTitleText(context, letters, letterSpacing);
   let x = width / 2 - totalWidth / 2;
-  const cutLetters = appConfig.simulation.intro.titleColorCutLetters
-    .map((cutLetter) => Math.min(letters.length - 1, Math.max(1, Math.round(cutLetter))))
-    .sort((a, b) => a - b);
+  const cutLetters = INTRO_TITLE_COLOR_CUT_LETTERS.map((cutLetter) =>
+    Math.min(letters.length - 1, Math.max(1, Math.round(cutLetter)))
+  ).sort((a, b) => a - b);
   const [firstCutLetter, secondCutLetter] = cutLetters;
   const letterBoxes = letters.map((letter, index) => {
     const letterWidth = context.measureText(letter).width;
@@ -330,17 +352,17 @@ const getIntroTitleFontSize = (
   width: number,
   height: number
 ): number => {
-  const maxWidth = width * appConfig.simulation.intro.maxWidthRatio;
-  const maxHeight = height * appConfig.simulation.intro.maxHeightRatio;
+  const maxWidth = width * INTRO_MAX_WIDTH_RATIO;
+  const maxHeight = height * INTRO_MAX_HEIGHT_RATIO;
   let fontSize = Math.floor(
     Math.min(
-      height * appConfig.simulation.intro.initialFontHeightRatio,
-      width * appConfig.simulation.intro.initialFontWidthRatio
+      height * INTRO_INITIAL_FONT_HEIGHT_RATIO,
+      width * INTRO_INITIAL_FONT_WIDTH_RATIO
     )
   );
 
-  while (fontSize > appConfig.simulation.intro.minFontSizePx) {
-    context.font = `${fontSize}px ${appConfig.simulation.intro.fontFamily}`;
+  while (fontSize > INTRO_MIN_FONT_SIZE_PX) {
+    context.font = `${fontSize}px ${INTRO_FONT_FAMILY}`;
     const metrics = context.measureText(INTRO_TITLE);
     const measuredHeight =
       metrics.actualBoundingBoxAscent + metrics.actualBoundingBoxDescent || fontSize;
@@ -349,7 +371,7 @@ const getIntroTitleFontSize = (
       return fontSize;
     }
 
-    fontSize = Math.floor(fontSize * appConfig.simulation.intro.fontScaleDown);
+    fontSize = Math.floor(fontSize * INTRO_FONT_SCALE_DOWN);
   }
 
   return fontSize;
@@ -369,10 +391,7 @@ const estimateMaskTangent = (
     getMaskAlpha(data, width, height, x, y + 1) -
     getMaskAlpha(data, width, height, x, y - 1);
 
-  if (
-    Math.abs(gradientX) + Math.abs(gradientY) <
-    appConfig.simulation.intro.maskGradientThreshold
-  ) {
+  if (Math.abs(gradientX) + Math.abs(gradientY) < INTRO_MASK_GRADIENT_THRESHOLD) {
     return null;
   }
 
@@ -397,8 +416,7 @@ const getIntroAgentPathProgress = (introProgress: number, introDelay: number): n
   }
 
   const activeProgress =
-    (introProgress - introDelay) /
-    Math.max(appConfig.simulation.intro.pathProgressEpsilon, 1 - introDelay);
+    (introProgress - introDelay) / Math.max(INTRO_PATH_PROGRESS_EPSILON, 1 - introDelay);
   return easePathProgress(clamp(activeProgress, 0, 1));
 };
 
@@ -414,7 +432,7 @@ const createSeededRandom = (seed: number): RandomSource => {
 };
 
 const easePathProgress = (amount: number): number => {
-  if (isLinearPathEasing(appConfig.simulation.intro.pathEasing)) {
+  if (isLinearPathEasing(INTRO_PATH_EASING)) {
     return amount;
   }
 
diff --git a/src/game-loop/perf-stats-overlay.ts b/src/game-loop/perf-stats-overlay.ts
index 9e6717f..e9853d9 100644
--- a/src/game-loop/perf-stats-overlay.ts
+++ b/src/game-loop/perf-stats-overlay.ts
@@ -4,6 +4,10 @@ const ZERO_STAT_TEXT = '0';
 const ZERO_FRAME_TIME_TEXT = '0ms';
 const ZERO_RESOLUTION_TEXT = '0x0';
 
+export const perfStatsOverlayState = {
+  isVisible: import.meta.env.DEV,
+};
+
 interface PerfStatsSnapshot {
   time: DOMHighResTimeStamp;
   fps: number;
diff --git a/src/game-loop/pointer-input.ts b/src/game-loop/pointer-input.ts
index bee83ef..c04196b 100644
--- a/src/game-loop/pointer-input.ts
+++ b/src/game-loop/pointer-input.ts
@@ -1,9 +1,9 @@
 import { vec2 } from 'gl-matrix';
 
 import { GardenAudio } from '../audio/garden-audio';
-import { appConfig } from '../config';
 import { getSafePixelRatio } from '../pipelines/brush/brush-pipeline';
 import { activeVibe } from '../settings';
+import { MIN_DELTA_TIME_SECONDS } from '../utils/delta-time-calculator';
 import { BrushStrokeSmoother } from './brush-stroke-smoother';
 import { type StrokeSegment } from './game-loop-types';
 import { getMirroredStrokeSegments } from './stroke-mirroring';
@@ -155,7 +155,7 @@ export class GardenPointerInput {
     const previousPosition = this.lastPointerPosition ?? position;
     const previousTimeMs = this.lastPointerEventTimeMs ?? event.timeStamp;
     const elapsedSeconds = Math.max(
-      appConfig.deltaTime.minDeltaTimeSeconds,
+      MIN_DELTA_TIME_SECONDS,
       (event.timeStamp - previousTimeMs) / 1000
     );
 
diff --git a/src/game-loop/simulation-frame.ts b/src/game-loop/simulation-frame.ts
index 36629e8..9064af2 100644
--- a/src/game-loop/simulation-frame.ts
+++ b/src/game-loop/simulation-frame.ts
@@ -1,4 +1,3 @@
-import { appConfig } from '../config';
 import { AgentPipeline } from '../pipelines/agents/agent-pipeline';
 import { BrushPipeline } from '../pipelines/brush/brush-pipeline';
 import { DiffusionPipeline } from '../pipelines/diffusion/diffusion-pipeline';
@@ -10,6 +9,11 @@ import { CanvasReadbackRequest } from './game-loop-types';
 import { GpuProfiler } from './gpu-profiler';
 import { SimulationTextures } from './simulation-textures';
 
+const BRUSH_EFFECT_FRAMES_PER_SECOND = 60;
+// How long the source map continues to be diffused after a brush stroke ends.
+// 600 frames at ~60 FPS is roughly 10 seconds.
+const SOURCE_ACTIVE_FRAMES_AFTER_WRITE = 600;
+
 interface SimulationFramePipelines {
   agentPipeline: AgentPipeline;
   brushPipeline: BrushPipeline;
@@ -135,10 +139,9 @@ export class SimulationFrameRenderer {
 }
 
 const getSourceActiveFrameCount = (): number => {
-  const frameCount =
-    settings.brushEffectDuration * appConfig.simulation.brushEffectFramesPerSecond;
+  const frameCount = settings.brushEffectDuration * BRUSH_EFFECT_FRAMES_PER_SECOND;
   if (Number.isFinite(frameCount) && frameCount > 0) {
     return Math.ceil(frameCount);
   }
-  return Math.max(1, appConfig.simulation.sourceActiveFramesAfterWrite);
+  return Math.max(1, SOURCE_ACTIVE_FRAMES_AFTER_WRITE);
 };
diff --git a/src/game-loop/simulation-textures.ts b/src/game-loop/simulation-textures.ts
index 7166595..bf62766 100644
--- a/src/game-loop/simulation-textures.ts
+++ b/src/game-loop/simulation-textures.ts
@@ -1,12 +1,13 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig } from '../config';
 import { ERASER_MASK_TEXTURE_FORMAT } from '../pipelines/texture-formats';
 import {
   ResizableTexture,
   type PendingTextureResize,
 } from '../utils/graphics/resizable-texture';
 
+const SIMULATION_CLEAR_COLOR = { r: 0, g: 0, b: 0, a: 0 };
+
 export class SimulationTextures {
   // trailMapA holds the current trail (read by agent and diffuse). trailMapB
   // receives the diffuse output; the two swap each frame so the freshly
@@ -83,7 +84,7 @@ export class SimulationTextures {
         colorAttachments: [
           {
             view: texture.getTextureView(),
-            clearValue: appConfig.simulation.clearColor,
+            clearValue: SIMULATION_CLEAR_COLOR,
             loadOp: 'clear',
             storeOp: 'store',
           },
@@ -122,7 +123,7 @@ export class SimulationTextures {
       colorAttachments: [
         {
           view: this.sourceMapA.getTextureView(),
-          clearValue: appConfig.simulation.clearColor,
+          clearValue: SIMULATION_CLEAR_COLOR,
           loadOp: 'clear',
           storeOp: 'store',
         },
diff --git a/src/game-loop/stroke-mirroring.ts b/src/game-loop/stroke-mirroring.ts
index 9bfb8d4..ffa9412 100644
--- a/src/game-loop/stroke-mirroring.ts
+++ b/src/game-loop/stroke-mirroring.ts
@@ -2,6 +2,9 @@ import { vec2 } from 'gl-matrix';
 
 import { type StrokeSegment } from './game-loop-types';
 
+export const MIN_MIRROR_SEGMENT_COUNT = 1;
+export const MAX_MIRROR_SEGMENT_COUNT = 12;
+
 export const getMirroredStrokeSegments = (
   from: vec2,
   to: vec2,
diff --git a/src/game-loop/toolbar-contrast-monitor.ts b/src/game-loop/toolbar-contrast-monitor.ts
index 8898123..df074d4 100644
--- a/src/game-loop/toolbar-contrast-monitor.ts
+++ b/src/game-loop/toolbar-contrast-monitor.ts
@@ -1,4 +1,3 @@
-import { appConfig } from '../config';
 import { clamp01 } from '../utils/math';
 import type { CanvasReadbackRequest } from './game-loop-types';
 
@@ -24,21 +23,41 @@ interface ToolbarContrastMetrics {
 
 const TOOLBAR_BACKGROUND_OPACITY_PROPERTY = '--toolbar-background-opacity';
 const TOOLBAR_BACKGROUND_STRENGTH_PROPERTY = '--toolbar-background-strength';
+const BACKGROUND_OPACITY_MAX = 0.82;
+const BRIGHT_LUMINANCE_THRESHOLD = 0.32;
+const BRIGHT_WEIGHT = 0.65;
+const BYTES_PER_SAMPLE = 4;
+const CONTRAST_OFFSET = 0.05;
 const GPU_COPY_BYTES_PER_ROW_ALIGNMENT = 256;
+const LINEAR_CHANNEL_BREAKPOINT = 0.03928;
+const LINEAR_CHANNEL_DIVISOR = 12.92;
+const LINEAR_CHANNEL_GAMMA = 2.4;
+const LINEAR_CHANNEL_OFFSET = 0.055;
+const LINEAR_CHANNEL_SCALE = 1.055;
+const LOW_CONTRAST_THRESHOLD = 3;
+const LOW_CONTRAST_WEIGHT = 1.8;
+const LUMINANCE_BASE = 0.11;
+const LUMINANCE_BLUE_WEIGHT = 0.0722;
+const LUMINANCE_GREEN_WEIGHT = 0.7152;
+const LUMINANCE_RANGE = 0.28;
+const LUMINANCE_RED_WEIGHT = 0.2126;
+const SAMPLE_COLUMNS = 13;
+const SAMPLE_INTERVAL_MS = 300;
+const SAMPLE_ROWS = 7;
+const WHITE_CONTRAST_NUMERATOR = 1.05;
 
 const getLinearChannel = (channel: number): number => {
   const normalized = channel / 255;
-  return normalized <= appConfig.toolbar.contrast.linearChannelBreakpoint
-    ? normalized / appConfig.toolbar.contrast.linearChannelDivisor
-    : ((normalized + appConfig.toolbar.contrast.linearChannelOffset) /
-        appConfig.toolbar.contrast.linearChannelScale) **
-        appConfig.toolbar.contrast.linearChannelGamma;
+  return normalized <= LINEAR_CHANNEL_BREAKPOINT
+    ? normalized / LINEAR_CHANNEL_DIVISOR
+    : ((normalized + LINEAR_CHANNEL_OFFSET) / LINEAR_CHANNEL_SCALE) **
+        LINEAR_CHANNEL_GAMMA;
 };
 
 const getRelativeLuminance = (red: number, green: number, blue: number): number =>
-  appConfig.toolbar.contrast.luminanceRedWeight * getLinearChannel(red) +
-  appConfig.toolbar.contrast.luminanceGreenWeight * getLinearChannel(green) +
-  appConfig.toolbar.contrast.luminanceBlueWeight * getLinearChannel(blue);
+  LUMINANCE_RED_WEIGHT * getLinearChannel(red) +
+  LUMINANCE_GREEN_WEIGHT * getLinearChannel(green) +
+  LUMINANCE_BLUE_WEIGHT * getLinearChannel(blue);
 
 const getToolbarContrastMetrics = (
   pixels: Uint8Array,
@@ -46,8 +65,7 @@ const getToolbarContrastMetrics = (
   isBgra: boolean
 ): ToolbarContrastMetrics => {
   const count = sampleOffsets.filter(
-    (offset) =>
-      offset >= 0 && offset + appConfig.toolbar.contrast.bytesPerSample <= pixels.length
+    (offset) => offset >= 0 && offset + BYTES_PER_SAMPLE <= pixels.length
   ).length;
   if (count === 0) {
     return {
@@ -63,10 +81,7 @@ const getToolbarContrastMetrics = (
   let lowContrastCount = 0;
 
   sampleOffsets.forEach((offset) => {
-    if (
-      offset < 0 ||
-      offset + appConfig.toolbar.contrast.bytesPerSample > pixels.length
-    ) {
+    if (offset < 0 || offset + BYTES_PER_SAMPLE > pixels.length) {
       return;
     }
 
@@ -74,15 +89,13 @@ const getToolbarContrastMetrics = (
     const green = pixels[offset + 1];
     const blue = pixels[offset + (isBgra ? 0 : 2)];
     const luminance = getRelativeLuminance(red, green, blue);
-    const contrastWithWhite =
-      appConfig.toolbar.contrast.whiteContrastNumerator /
-      (luminance + appConfig.toolbar.contrast.contrastOffset);
+    const contrastWithWhite = WHITE_CONTRAST_NUMERATOR / (luminance + CONTRAST_OFFSET);
 
     luminanceTotal += luminance;
-    if (luminance > appConfig.toolbar.contrast.brightLuminanceThreshold) {
+    if (luminance > BRIGHT_LUMINANCE_THRESHOLD) {
       brightCount++;
     }
-    if (contrastWithWhite < appConfig.toolbar.contrast.lowContrastThreshold) {
+    if (contrastWithWhite < LOW_CONTRAST_THRESHOLD) {
       lowContrastCount++;
     }
   });
@@ -91,13 +104,11 @@ const getToolbarContrastMetrics = (
   const brightRatio = brightCount / count;
   const lowContrastRatio = lowContrastCount / count;
   const backgroundStrength = clamp01(
-    Math.max(0, averageLuminance - appConfig.toolbar.contrast.luminanceBase) /
-      appConfig.toolbar.contrast.luminanceRange +
-      brightRatio * appConfig.toolbar.contrast.brightWeight +
-      lowContrastRatio * appConfig.toolbar.contrast.lowContrastWeight
+    Math.max(0, averageLuminance - LUMINANCE_BASE) / LUMINANCE_RANGE +
+      brightRatio * BRIGHT_WEIGHT +
+      lowContrastRatio * LOW_CONTRAST_WEIGHT
   );
-  const backgroundOpacity =
-    backgroundStrength * appConfig.toolbar.contrast.backgroundOpacityMax;
+  const backgroundOpacity = backgroundStrength * BACKGROUND_OPACITY_MAX;
 
   return {
     averageLuminance,
@@ -128,7 +139,7 @@ export class ToolbarContrastMonitor {
     if (
       this.isDestroyed ||
       this.isReadbackPending ||
-      time - this.lastSampleAt < appConfig.toolbar.contrast.sampleIntervalMs
+      time - this.lastSampleAt < SAMPLE_INTERVAL_MS
     ) {
       return null;
     }
@@ -211,12 +222,12 @@ export class ToolbarContrastMonitor {
 
   private setToolbarBackgroundOpacity(backgroundOpacity: number): void {
     const safeBackgroundOpacity = Math.min(
-      appConfig.toolbar.contrast.backgroundOpacityMax,
+      BACKGROUND_OPACITY_MAX,
       Math.max(0, backgroundOpacity)
     );
     const backgroundStrength =
-      appConfig.toolbar.contrast.backgroundOpacityMax > 0
-        ? clamp01(safeBackgroundOpacity / appConfig.toolbar.contrast.backgroundOpacityMax)
+      BACKGROUND_OPACITY_MAX > 0
+        ? clamp01(safeBackgroundOpacity / BACKGROUND_OPACITY_MAX)
         : 0;
 
     this.toolbar.style.setProperty(
@@ -279,22 +290,20 @@ export class ToolbarContrastMonitor {
     }
 
     const bytesPerRow = alignTo(
-      width * appConfig.toolbar.contrast.bytesPerSample,
+      width * BYTES_PER_SAMPLE,
       GPU_COPY_BYTES_PER_ROW_ALIGNMENT
     );
     const points = new Map<string, CanvasSamplePoint>();
 
-    for (let row = 0; row < appConfig.toolbar.contrast.sampleRows; row++) {
-      const cssY =
-        top + ((row + 0.5) / appConfig.toolbar.contrast.sampleRows) * cssHeight;
+    for (let row = 0; row < SAMPLE_ROWS; row++) {
+      const cssY = top + ((row + 0.5) / SAMPLE_ROWS) * cssHeight;
       const y = Math.min(
         this.canvas.height - 1,
         Math.max(0, Math.floor((cssY - canvasRect.top) * yScale))
       );
 
-      for (let column = 0; column < appConfig.toolbar.contrast.sampleColumns; column++) {
-        const cssX =
-          left + ((column + 0.5) / appConfig.toolbar.contrast.sampleColumns) * cssWidth;
+      for (let column = 0; column < SAMPLE_COLUMNS; column++) {
+        const cssX = left + ((column + 0.5) / SAMPLE_COLUMNS) * cssWidth;
         const x = Math.min(
           this.canvas.width - 1,
           Math.max(0, Math.floor((cssX - canvasRect.left) * xScale))
@@ -309,8 +318,7 @@ export class ToolbarContrastMonitor {
       origin,
       sampleOffsets: [...points.values()].map(
         (point) =>
-          (point.y - origin.y) * bytesPerRow +
-          (point.x - origin.x) * appConfig.toolbar.contrast.bytesPerSample
+          (point.y - origin.y) * bytesPerRow + (point.x - origin.x) * BYTES_PER_SAMPLE
       ),
       width,
     };
diff --git a/src/page/audio-control.ts b/src/page/audio-control.ts
index 7677bad..159c6c2 100644
--- a/src/page/audio-control.ts
+++ b/src/page/audio-control.ts
@@ -1,19 +1,24 @@
-import { appConfig } from '../config';
+import { DEFAULT_AUDIO_VOLUME } from '../audio/garden-audio-config';
 import type GameLoop from '../game-loop/game-loop';
 import { readBrowserStorage, writeBrowserStorage } from '../utils/browser-storage';
 import { queryRequiredElement } from '../utils/dom';
 import { clamp01 } from '../utils/math';
 
+const AUDIO_MUTED_STORAGE_KEY = 'fleeting-garden:audio-muted';
+const AUDIO_VOLUME_STORAGE_KEY = 'fleeting-garden:audio-volume';
+const AUDIO_VOLUME_MIN = 0;
+const AUDIO_VOLUME_MAX = 1;
+const AUDIO_VOLUME_STEP = 0.01;
+
 const clampAudioVolume = (value: number): number => {
-  const { default: defaultVolume, max, min } = appConfig.toolbar.volume;
-  const safeValue = Number.isFinite(value) ? value : defaultVolume;
-  return Math.min(max, Math.max(min, clamp01(safeValue)));
+  const safeValue = Number.isFinite(value) ? value : DEFAULT_AUDIO_VOLUME;
+  return Math.min(AUDIO_VOLUME_MAX, Math.max(AUDIO_VOLUME_MIN, clamp01(safeValue)));
 };
 
 const readInitialAudioVolume = (): number => {
-  const storedVolume = readBrowserStorage(appConfig.storage.audioVolumeKey);
+  const storedVolume = readBrowserStorage(AUDIO_VOLUME_STORAGE_KEY);
   return storedVolume === null
-    ? appConfig.toolbar.volume.default
+    ? DEFAULT_AUDIO_VOLUME
     : clampAudioVolume(Number(storedVolume));
 };
 
@@ -45,7 +50,7 @@ export class AudioControl {
 
   private audioVolume = readInitialAudioVolume();
   private isMutedState =
-    readBrowserStorage(appConfig.storage.audioMutedKey) === STORED_MUTED_TRUE ||
+    readBrowserStorage(AUDIO_MUTED_STORAGE_KEY) === STORED_MUTED_TRUE ||
     this.audioVolume <= 0;
 
   public constructor(private readonly options: AudioControlOptions) {
@@ -85,9 +90,9 @@ export class AudioControl {
     this.soundButton.setAttribute('aria-label', muteLabel);
     this.soundButton.title = muteLabel;
 
-    this.volumeSlider.min = appConfig.toolbar.volume.min.toString();
-    this.volumeSlider.max = appConfig.toolbar.volume.max.toString();
-    this.volumeSlider.step = appConfig.toolbar.volume.step.toString();
+    this.volumeSlider.min = AUDIO_VOLUME_MIN.toString();
+    this.volumeSlider.max = AUDIO_VOLUME_MAX.toString();
+    this.volumeSlider.step = AUDIO_VOLUME_STEP.toString();
     this.volumeSlider.value = formatStoredAudioVolume(this.audioVolume);
     this.volumeSlider.setAttribute(
       'aria-valuetext',
@@ -107,7 +112,7 @@ export class AudioControl {
   private readonly onToggleMute = () => {
     const shouldUnmute = this.isMutedState || this.audioVolume <= 0;
     if (shouldUnmute && this.audioVolume <= 0) {
-      this.audioVolume = appConfig.toolbar.volume.default;
+      this.audioVolume = DEFAULT_AUDIO_VOLUME;
     }
     this.isMutedState = !shouldUnmute;
     this.persist();
@@ -141,11 +146,11 @@ export class AudioControl {
 
   private persist(): void {
     writeBrowserStorage(
-      appConfig.storage.audioMutedKey,
+      AUDIO_MUTED_STORAGE_KEY,
       this.isMutedState ? STORED_MUTED_TRUE : STORED_MUTED_FALSE
     );
     writeBrowserStorage(
-      appConfig.storage.audioVolumeKey,
+      AUDIO_VOLUME_STORAGE_KEY,
       formatStoredAudioVolume(this.audioVolume)
     );
   }
diff --git a/src/page/color-reaction-matrix-control.ts b/src/page/color-reaction-matrix-control.ts
index ca78cbb..756fd63 100644
--- a/src/page/color-reaction-matrix-control.ts
+++ b/src/page/color-reaction-matrix-control.ts
@@ -1,6 +1,6 @@
 import type { FolderApi } from '@tweakpane/core';
 
-import { appConfig, normalizeNumberControlValue } from '../config';
+import { normalizeNumberControlValue, runtimeControls } from '../config';
 import { activeVibe, settings } from '../settings';
 import { rgbColorToCss } from '../utils/rgb-color';
 
@@ -128,7 +128,7 @@ export class ColorReactionMatrixControl {
     const cell = document.createElement('div');
     cell.className = 'color-reaction-matrix__cell';
 
-    const config = appConfig.runtimeSettings.controls[key];
+    const config = runtimeControls[key];
     if (!config) {
       return cell;
     }
@@ -165,7 +165,7 @@ export class ColorReactionMatrixControl {
     sourceColorIndex: number,
     targetColorIndex: number
   ): void {
-    const config = appConfig.runtimeSettings.controls[key];
+    const config = runtimeControls[key];
     if (!config) {
       return;
     }
diff --git a/src/page/config-pane.ts b/src/page/config-pane.ts
index 8bb7f28..bdae8f7 100644
--- a/src/page/config-pane.ts
+++ b/src/page/config-pane.ts
@@ -3,11 +3,12 @@ import { Pane } from 'tweakpane';
 
 import type { GardenAudioVibeSettings } from '../audio/garden-audio-config';
 import {
-  appConfig,
   normalizeNumberControlValue,
+  runtimeControls,
   type GardenRuntimeSettings,
   type NumberControlConfig,
 } from '../config';
+import { perfStatsOverlayState } from '../game-loop/perf-stats-overlay';
 import { activeVibe, settings } from '../settings';
 import { hexColorToRgbColor, rgbColorToHex, type RgbColor } from '../utils/rgb-color';
 import { ColorReactionMatrixControl } from './color-reaction-matrix-control';
@@ -29,6 +30,8 @@ interface PaneState extends GardenAudioVibeSettings {
 }
 
 const runtimeFolderOrder = ['Brush', 'Movement', 'Look', 'Performance'] as const;
+const CONFIG_PANE_TITLE = 'Garden Settings';
+const CONFIG_PANE_START_HIDDEN = true;
 
 const MUSIC_CONTROLS: ReadonlyArray<{
   key: VibeNumberKey;
@@ -56,7 +59,7 @@ interface ConfigPaneOptions {
 
 const getRuntimeControlKeys = (folder: string): Array<RuntimeControlKey> =>
   (
-    Object.entries(appConfig.runtimeSettings.controls) as Array<
+    Object.entries(runtimeControls) as Array<
       [RuntimeControlKey, NumberControlConfig | undefined]
     >
   )
@@ -123,10 +126,10 @@ export class ConfigPane {
 
     this.pane = new Pane({
       container: this.container,
-      title: appConfig.tuningPane.title,
+      title: CONFIG_PANE_TITLE,
       expanded: true,
     });
-    this.pane.hidden = appConfig.tuningPane.startHidden;
+    this.pane.hidden = CONFIG_PANE_START_HIDDEN;
     this.pane.element.classList.add('config-pane');
     this.pane.element.id = 'config-pane';
 
@@ -310,7 +313,7 @@ export class ConfigPane {
   private getRuntimeControlConfig(
     key: RuntimeControlKey
   ): NumberControlConfig | undefined {
-    const config = appConfig.runtimeSettings.controls[key];
+    const config = runtimeControls[key];
     if (!config || key !== 'maxAgentCount') {
       return config;
     }
@@ -323,7 +326,7 @@ export class ConfigPane {
 
   private addFpsOverlayBinding(container: PaneContainer): void {
     container
-      .addBinding(appConfig.tuningPane, 'showFpsOverlay', {
+      .addBinding(perfStatsOverlayState, 'isVisible', {
         label: 'Show FPS',
       })
       .on('change', () => this.options.onConfigChange());
diff --git a/src/page/eraser-size-control.test.ts b/src/page/eraser-size-control.test.ts
index 6b2bbe8..1d93778 100644
--- a/src/page/eraser-size-control.test.ts
+++ b/src/page/eraser-size-control.test.ts
@@ -1,26 +1,26 @@
 import { describe, expect, it } from 'vitest';
 
-import { appConfig } from '../config';
 import {
+  ERASER_SIZE_MAX,
+  ERASER_SIZE_MIN,
   getEraserSizeFromSliderRatio,
   getEraserSliderRatioFromSize,
 } from './eraser-size-control';
 
 describe('eraser size slider mapping', () => {
   it('maps slider position quadratically to eraser size', () => {
-    const { max, min } = appConfig.toolbar.eraser;
-
-    expect(getEraserSizeFromSliderRatio(0)).toBe(min);
-    expect(getEraserSizeFromSliderRatio(0.5)).toBe(min + (max - min) * 0.25);
-    expect(getEraserSizeFromSliderRatio(1)).toBe(max);
+    expect(getEraserSizeFromSliderRatio(0)).toBe(ERASER_SIZE_MIN);
+    expect(getEraserSizeFromSliderRatio(0.5)).toBe(
+      ERASER_SIZE_MIN + (ERASER_SIZE_MAX - ERASER_SIZE_MIN) * 0.25
+    );
+    expect(getEraserSizeFromSliderRatio(1)).toBe(ERASER_SIZE_MAX);
   });
 
   it('maps eraser size back to the inverse slider position', () => {
-    const { max, min } = appConfig.toolbar.eraser;
-    const quarterRangeSize = min + (max - min) * 0.25;
+    const quarterRangeSize = ERASER_SIZE_MIN + (ERASER_SIZE_MAX - ERASER_SIZE_MIN) * 0.25;
 
-    expect(getEraserSliderRatioFromSize(min)).toBe(0);
+    expect(getEraserSliderRatioFromSize(ERASER_SIZE_MIN)).toBe(0);
     expect(getEraserSliderRatioFromSize(quarterRangeSize)).toBe(0.5);
-    expect(getEraserSliderRatioFromSize(max)).toBe(1);
+    expect(getEraserSliderRatioFromSize(ERASER_SIZE_MAX)).toBe(1);
   });
 });
diff --git a/src/page/eraser-size-control.ts b/src/page/eraser-size-control.ts
index 2c0e8a8..8f93d51 100644
--- a/src/page/eraser-size-control.ts
+++ b/src/page/eraser-size-control.ts
@@ -1,12 +1,16 @@
-import { appConfig } from '../config';
 import type GameLoop from '../game-loop/game-loop';
-import { settings } from '../settings';
+import { DEFAULT_ERASER_SIZE, settings } from '../settings';
 import { queryRequiredElement } from '../utils/dom';
 
+export const ERASER_SIZE_MIN = 24;
+export const ERASER_SIZE_MAX = 480;
+
+const ERASER_CONTROL_SCALE_MIN = 0.74;
+const ERASER_CONTROL_SCALE_MAX = 1.34;
+
 const clampEraserSize = (value: number): number => {
-  const { default: defaultSize, max, min } = appConfig.toolbar.eraser;
-  const safeValue = Number.isFinite(value) ? value : defaultSize;
-  return Math.min(max, Math.max(min, Math.round(safeValue)));
+  const safeValue = Number.isFinite(value) ? value : DEFAULT_ERASER_SIZE;
+  return Math.min(ERASER_SIZE_MAX, Math.max(ERASER_SIZE_MIN, Math.round(safeValue)));
 };
 
 const ERASER_SLIDER_MIN = 0;
@@ -19,13 +23,14 @@ const clampSliderRatio = (value: number): number => {
 };
 
 const getEraserSizeRatio = (size: number): number => {
-  const { max, min } = appConfig.toolbar.eraser;
-  return (clampEraserSize(size) - min) / (max - min);
+  return (clampEraserSize(size) - ERASER_SIZE_MIN) / (ERASER_SIZE_MAX - ERASER_SIZE_MIN);
 };
 
 export const getEraserSizeFromSliderRatio = (sliderRatio: number): number => {
-  const { max, min } = appConfig.toolbar.eraser;
-  return clampEraserSize(min + (max - min) * clampSliderRatio(sliderRatio) ** 2);
+  return clampEraserSize(
+    ERASER_SIZE_MIN +
+      (ERASER_SIZE_MAX - ERASER_SIZE_MIN) * clampSliderRatio(sliderRatio) ** 2
+  );
 };
 
 export const getEraserSliderRatioFromSize = (size: number): number =>
@@ -72,10 +77,8 @@ export class EraserSizeControl {
 
     const sizeRatio = getEraserSizeRatio(size);
     const scale =
-      appConfig.toolbar.eraser.controlScaleMin +
-      (appConfig.toolbar.eraser.controlScaleMax -
-        appConfig.toolbar.eraser.controlScaleMin) *
-        sizeRatio;
+      ERASER_CONTROL_SCALE_MIN +
+      (ERASER_CONTROL_SCALE_MAX - ERASER_CONTROL_SCALE_MIN) * sizeRatio;
     this.control.style.setProperty('--eraser-progress', `${sliderRatio * 100}%`);
     this.control.style.setProperty('--eraser-control-scale', scale.toFixed(3));
     this.syncActiveState();
diff --git a/src/page/menu-hider.ts b/src/page/menu-hider.ts
index ed8aa59..4f371c6 100644
--- a/src/page/menu-hider.ts
+++ b/src/page/menu-hider.ts
@@ -1,9 +1,10 @@
-import { appConfig } from '../config';
+const DESKTOP_AUTO_HIDE_MEDIA_QUERY =
+  '(min-width: 600px) and (hover: hover) and (pointer: fine)';
+const HIDE_DELAY_MS = 3000;
+const BOTTOM_REVEAL_DISTANCE_PX = 96;
 
 export class MenuHider {
-  private readonly desktopMediaQuery = window.matchMedia(
-    appConfig.menuHider.desktopMediaQuery
-  );
+  private readonly desktopMediaQuery = window.matchMedia(DESKTOP_AUTO_HIDE_MEDIA_QUERY);
   private hideTimeout: number | undefined;
   private isHidden = false;
   private pointerInside = false;
@@ -95,7 +96,7 @@ export class MenuHider {
       if (this.canAutoHide) {
         this.hide();
       }
-    }, appConfig.menuHider.hideDelayMs);
+    }, HIDE_DELAY_MS);
   }
 
   private reveal(): void {
@@ -134,6 +135,6 @@ export class MenuHider {
 
   private isNearViewportBottom(clientY: number): boolean {
     const viewportHeight = window.innerHeight || document.documentElement.clientHeight;
-    return clientY >= viewportHeight - appConfig.menuHider.bottomRevealDistancePx;
+    return clientY >= viewportHeight - BOTTOM_REVEAL_DISTANCE_PX;
   }
 }
diff --git a/src/page/mirror-segment-control.ts b/src/page/mirror-segment-control.ts
index 1ea8ddc..f058429 100644
--- a/src/page/mirror-segment-control.ts
+++ b/src/page/mirror-segment-control.ts
@@ -1,25 +1,48 @@
-import { appConfig } from '../config';
-import { settings } from '../settings';
+import {
+  MAX_MIRROR_SEGMENT_COUNT,
+  MIN_MIRROR_SEGMENT_COUNT,
+} from '../game-loop/stroke-mirroring';
+import { DEFAULT_MIRROR_SEGMENT_COUNT, settings } from '../settings';
 import { queryRequiredElement } from '../utils/dom';
 
+const MIRROR_SEGMENT_STEP = 1;
+const MIRROR_SEGMENT_OFF_LABEL = 'Mirror off';
+const MIRROR_SEGMENT_FALLBACK_NAME = 'slices';
+const MIRROR_SEGMENT_NAMES = {
+  2: 'halves',
+  3: 'thirds',
+  4: 'quarters',
+  5: 'fifths',
+  6: 'sixths',
+  7: 'sevenths',
+  8: 'eighths',
+  9: 'ninths',
+  10: 'tenths',
+  11: 'elevenths',
+  12: 'twelfths',
+} satisfies Record<number, string>;
+
 const clampMirrorSegmentCount = (value: number): number => {
-  const { default: defaultCount, max, min } = appConfig.toolbar.mirror;
-  const safeValue = Number.isFinite(value) ? value : defaultCount;
-  return Math.min(max, Math.max(min, Math.round(safeValue)));
+  const safeValue = Number.isFinite(value) ? value : DEFAULT_MIRROR_SEGMENT_COUNT;
+  return Math.min(
+    MAX_MIRROR_SEGMENT_COUNT,
+    Math.max(MIN_MIRROR_SEGMENT_COUNT, Math.round(safeValue))
+  );
 };
 
 const getMirrorSegmentRatio = (count: number): number => {
-  const { max, min } = appConfig.toolbar.mirror;
-  return (count - min) / (max - min);
+  return (
+    (count - MIN_MIRROR_SEGMENT_COUNT) /
+    (MAX_MIRROR_SEGMENT_COUNT - MIN_MIRROR_SEGMENT_COUNT)
+  );
 };
 
 const formatMirrorSegmentCount = (count: number): string =>
   count <= 1
-    ? appConfig.toolbar.mirror.offLabel
+    ? MIRROR_SEGMENT_OFF_LABEL
     : `${count} ${
-        appConfig.toolbar.mirror.names[
-          count as keyof typeof appConfig.toolbar.mirror.names
-        ] ?? appConfig.toolbar.mirror.fallbackSegmentName
+        MIRROR_SEGMENT_NAMES[count as keyof typeof MIRROR_SEGMENT_NAMES] ??
+        MIRROR_SEGMENT_FALLBACK_NAME
       }`;
 
 interface MirrorSegmentControlOptions {
@@ -50,9 +73,9 @@ export class MirrorSegmentControl {
       settings.mirrorSegmentCount = count;
     }
 
-    this.slider.min = appConfig.toolbar.mirror.min.toString();
-    this.slider.max = appConfig.toolbar.mirror.max.toString();
-    this.slider.step = appConfig.toolbar.mirror.step.toString();
+    this.slider.min = MIN_MIRROR_SEGMENT_COUNT.toString();
+    this.slider.max = MAX_MIRROR_SEGMENT_COUNT.toString();
+    this.slider.step = MIRROR_SEGMENT_STEP.toString();
     this.slider.value = count.toString();
 
     const label = formatMirrorSegmentCount(count);
diff --git a/src/pipelines/brush/brush-pipeline.ts b/src/pipelines/brush/brush-pipeline.ts
index b759c4f..4897020 100644
--- a/src/pipelines/brush/brush-pipeline.ts
+++ b/src/pipelines/brush/brush-pipeline.ts
@@ -1,6 +1,5 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig } from '../../config';
 import { getRenderQualityBrushSize } from '../../config/brush-size';
 import {
   createCachedBufferWrite,
@@ -40,6 +39,7 @@ export const getSafePixelRatio = (pixelRatio: number | undefined): number =>
     : 1;
 
 const UNIFORM_COUNT = 16;
+const MAX_BRUSH_LINE_COUNT = 240;
 
 const setBrushUniformValues = (
   target: Float32Array,
@@ -93,7 +93,7 @@ export class BrushPipeline {
     private readonly device: GPUDevice,
     private readonly commonState: CommonState
   ) {
-    this.segments = new LineSegmentBuffer(device, appConfig.pipelines.brush.maxLineCount);
+    this.segments = new LineSegmentBuffer(device, MAX_BRUSH_LINE_COUNT);
 
     this.bindGroupLayout = device.createBindGroupLayout({
       entries: [
diff --git a/src/pipelines/common-state/common-state.ts b/src/pipelines/common-state/common-state.ts
index 5157459..deeaa8a 100644
--- a/src/pipelines/common-state/common-state.ts
+++ b/src/pipelines/common-state/common-state.ts
@@ -1,11 +1,10 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig } from '../../config';
 import {
   createCachedBufferWrite,
   writeBufferIfChanged,
 } from '../../utils/graphics/cached-buffer-write';
-import { generateNoise } from '../../utils/graphics/noise';
+import { generateNoise, NOISE_TEXTURE_SIZE } from '../../utils/graphics/noise';
 
 export class CommonState {
   private static readonly UNIFORM_COUNT = 4;
@@ -39,8 +38,8 @@ export class CommonState {
 
     const noise = generateNoise({
       device,
-      width: appConfig.pipelines.common.noiseTextureSize,
-      height: appConfig.pipelines.common.noiseTextureSize,
+      width: NOISE_TEXTURE_SIZE,
+      height: NOISE_TEXTURE_SIZE,
     });
     this.noise = noise.texture;
 
diff --git a/src/pipelines/diffusion/diffusion-pipeline.ts b/src/pipelines/diffusion/diffusion-pipeline.ts
index b1c763d..ef9bfef 100644
--- a/src/pipelines/diffusion/diffusion-pipeline.ts
+++ b/src/pipelines/diffusion/diffusion-pipeline.ts
@@ -1,6 +1,5 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig } from '../../config';
 import { createBindGroupCache } from '../../utils/graphics/bind-group-cache';
 import {
   createCachedBufferWrite,
@@ -29,12 +28,13 @@ type DiffusionUniformSettings = Pick<
   | 'brushDecayAlphaOffset'
 >;
 
+const MIN_DIFFUSION_RATE = 0.000001;
+
 const getSafeInverseDiffusionRate = (diffusionRate: number): number =>
   1 /
-  (Number.isFinite(diffusionRate) &&
-  diffusionRate > appConfig.pipelines.diffusion.minDiffusionRate
+  (Number.isFinite(diffusionRate) && diffusionRate > MIN_DIFFUSION_RATE
     ? diffusionRate
-    : appConfig.pipelines.diffusion.minDiffusionRate);
+    : MIN_DIFFUSION_RATE);
 
 const setDiffusionUniformValues = (
   target: Float32Array,
diff --git a/src/pipelines/eraser/eraser-texture-pipeline.ts b/src/pipelines/eraser/eraser-texture-pipeline.ts
index 694777f..cf3e84a 100644
--- a/src/pipelines/eraser/eraser-texture-pipeline.ts
+++ b/src/pipelines/eraser/eraser-texture-pipeline.ts
@@ -1,6 +1,5 @@
 import { vec2 } from 'gl-matrix';
 
-import { appConfig } from '../../config';
 import {
   createCachedBufferWrite,
   writeBufferIfChanged,
@@ -29,6 +28,7 @@ interface EraserTextureParameters {
 }
 
 const UNIFORM_COUNT = 8;
+const MAX_ERASER_TEXTURE_LINE_COUNT = 384;
 const TARGET_FORMATS: Array<GPUTextureFormat> = [
   ERASER_MASK_TEXTURE_FORMAT,
   TRAIL_SOURCE_TEXTURE_FORMAT,
@@ -50,10 +50,7 @@ export class EraserTexturePipeline {
     private readonly device: GPUDevice,
     private readonly commonState: CommonState
   ) {
-    this.segments = new LineSegmentBuffer(
-      device,
-      appConfig.pipelines.eraser.maxTextureLineCount
-    );
+    this.segments = new LineSegmentBuffer(device, MAX_ERASER_TEXTURE_LINE_COUNT);
 
     this.bindGroupLayout = device.createBindGroupLayout({
       entries: [
diff --git a/src/settings.ts b/src/settings.ts
index c91ac83..bceadd9 100644
--- a/src/settings.ts
+++ b/src/settings.ts
@@ -1,10 +1,14 @@
 import {
-  appConfig,
+  defaultSettings,
   normalizeRuntimeSettings,
+  runtimeControls,
   type GardenRuntimeSettings,
 } from './config';
 import { writeBrowserStorage } from './utils/browser-storage';
-import { getInitialVibe, type VibePreset } from './vibes';
+import { getInitialVibe, VIBE_STORAGE_KEY, type VibePreset } from './vibes';
+
+export const DEFAULT_ERASER_SIZE = 96;
+export const DEFAULT_MIRROR_SEGMENT_COUNT = 8;
 
 const preservedRuntimeSettingKeys = [
   'eraserSize',
@@ -37,12 +41,12 @@ const cloneVibePreset = (vibe: VibePreset): VibePreset => ({
 const buildSettings = (vibe: VibePreset): GardenRuntimeSettings =>
   normalizeRuntimeSettings(
     {
-      ...appConfig.defaultSettings,
-      eraserSize: appConfig.toolbar.eraser.default,
-      mirrorSegmentCount: appConfig.toolbar.mirror.default,
+      ...defaultSettings,
+      eraserSize: DEFAULT_ERASER_SIZE,
+      mirrorSegmentCount: DEFAULT_MIRROR_SEGMENT_COUNT,
       ...vibe.settings,
     },
-    appConfig.runtimeSettings.controls
+    runtimeControls
   );
 
 export let activeVibe = cloneVibePreset(getInitialVibe());
@@ -52,7 +56,7 @@ export const settings: GardenRuntimeSettings = {
 };
 
 export const rememberActiveVibeSelection = (): void => {
-  writeBrowserStorage(appConfig.storage.vibeKey, activeVibe.id);
+  writeBrowserStorage(VIBE_STORAGE_KEY, activeVibe.id);
 };
 
 export const applyVibeSettings = (vibe: VibePreset) => {
@@ -66,10 +70,7 @@ export const applyVibeSettings = (vibe: VibePreset) => {
     activeVibe.colors.length - 1
   );
 
-  Object.assign(
-    settings,
-    normalizeRuntimeSettings(nextSettings, appConfig.runtimeSettings.controls)
-  );
+  Object.assign(settings, normalizeRuntimeSettings(nextSettings, runtimeControls));
 
   rememberActiveVibeSelection();
 
diff --git a/src/utils/delta-time-calculator.ts b/src/utils/delta-time-calculator.ts
index 78489c2..bff0468 100644
--- a/src/utils/delta-time-calculator.ts
+++ b/src/utils/delta-time-calculator.ts
@@ -1,6 +1,9 @@
-import { appConfig } from '../config';
 import { clamp } from './math';
 
+export const MIN_DELTA_TIME_SECONDS = 1 / 240;
+
+const MAX_DELTA_TIME_SECONDS = 1 / 30;
+
 export class DeltaTimeCalculator {
   private previousTime: DOMHighResTimeStamp | null = null;
   private readonly visibilityChangeListener = () => this.handleVisibilityChange();
@@ -16,11 +19,7 @@ export class DeltaTimeCalculator {
 
     const delta = currentTime - this.previousTime;
     this.previousTime = currentTime;
-    return clamp(
-      delta / 1000,
-      appConfig.deltaTime.minDeltaTimeSeconds,
-      appConfig.deltaTime.maxDeltaTimeSeconds
-    );
+    return clamp(delta / 1000, MIN_DELTA_TIME_SECONDS, MAX_DELTA_TIME_SECONDS);
   }
 
   private handleVisibilityChange() {
diff --git a/src/utils/graphics/noise.ts b/src/utils/graphics/noise.ts
index c7cdc96..4e171fd 100644
--- a/src/utils/graphics/noise.ts
+++ b/src/utils/graphics/noise.ts
@@ -1,7 +1,17 @@
-import { appConfig } from '../../config';
 import { setUpFullScreenQuad } from './full-screen-quad';
 import { smartCompile } from './smart-compile';
 
+export const NOISE_TEXTURE_SIZE = 2048;
+
+const NOISE_CHANNEL_SEEDS = [0, 1, 2, 3] as const;
+const NOISE_CLEAR_VALUE = { r: 1, g: 1, b: 1, a: 1 };
+const NOISE_DRAW_INSTANCE_COUNT = 1;
+const NOISE_DRAW_VERTEX_COUNT = 3;
+const NOISE_HASH_MULTIPLIER = 43758.5453123;
+const NOISE_HASH_X = 12.9898;
+const NOISE_HASH_Y = 78.233;
+const NOISE_TEXTURE_FORMAT = 'r8unorm';
+
 export interface GeneratedNoiseTexture {
   texture: GPUTexture;
   view: GPUTextureView;
@@ -29,16 +39,16 @@ export const generateNoise = ({
           return fract(sin(dot(
             uv,
             vec2(
-              ${appConfig.pipelines.common.noiseHashX} + seed,
-              ${appConfig.pipelines.common.noiseHashY} + seed
+              ${NOISE_HASH_X} + seed,
+              ${NOISE_HASH_Y} + seed
             )
-          )) * ${appConfig.pipelines.common.noiseHashMultiplier} + seed);
+          )) * ${NOISE_HASH_MULTIPLIER} + seed);
         }
 
         @fragment
         fn fragment(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
           return vec4(
-            random_with_seed(uv, ${appConfig.pipelines.common.noiseChannelSeeds[0]}),
+            random_with_seed(uv, ${NOISE_CHANNEL_SEEDS[0]}),
             0.0,
             0.0,
             1.0,
@@ -48,7 +58,7 @@ export const generateNoise = ({
       entryPoint: 'fragment',
       targets: [
         {
-          format: appConfig.pipelines.common.noiseTextureFormat,
+          format: NOISE_TEXTURE_FORMAT,
         },
       ],
     },
@@ -63,7 +73,7 @@ export const generateNoise = ({
       height,
       depthOrArrayLayers: 1,
     },
-    format: appConfig.pipelines.common.noiseTextureFormat,
+    format: NOISE_TEXTURE_FORMAT,
     usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.RENDER_ATTACHMENT,
   });
 
@@ -71,7 +81,7 @@ export const generateNoise = ({
     colorAttachments: [
       {
         view: colorTexture.createView(),
-        clearValue: appConfig.pipelines.common.noiseClearValue,
+        clearValue: NOISE_CLEAR_VALUE,
         loadOp: 'clear',
         storeOp: 'store',
       },
@@ -82,10 +92,7 @@ export const generateNoise = ({
 
   const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
   passEncoder.setPipeline(pipeline);
-  passEncoder.draw(
-    appConfig.pipelines.common.noiseDrawVertexCount,
-    appConfig.pipelines.common.noiseDrawInstanceCount
-  );
+  passEncoder.draw(NOISE_DRAW_VERTEX_COUNT, NOISE_DRAW_INSTANCE_COUNT);
   passEncoder.end();
 
   device.queue.submit([commandEncoder.finish()]);
diff --git a/src/vibe-registry.ts b/src/vibe-registry.ts
index 0b0ae54..ad16554 100644
--- a/src/vibe-registry.ts
+++ b/src/vibe-registry.ts
@@ -1,7 +1,7 @@
-import { appConfig } from './config';
+import { vibePresets } from './config';
 import type { VibeId, VibePreset } from './config/types';
 
-export const VIBE_PRESETS: Array<VibePreset> = appConfig.vibes.presets;
+export const VIBE_PRESETS: Array<VibePreset> = vibePresets;
 
 export const getVibeById = (vibeId: VibeId): VibePreset | undefined =>
   VIBE_PRESETS.find((vibe) => vibe.id === vibeId);
diff --git a/src/vibes.ts b/src/vibes.ts
index 95d1f7c..28aed48 100644
--- a/src/vibes.ts
+++ b/src/vibes.ts
@@ -1,4 +1,4 @@
-import { appConfig } from './config';
+import { defaultVibeId } from './config';
 import { VibeId, type VibePreset } from './config/types';
 import { readBrowserStorage } from './utils/browser-storage';
 import { getVibeById, VIBE_PRESETS } from './vibe-registry';
@@ -8,6 +8,8 @@ export { VibeId };
 export { getVibeById, VIBE_PRESETS };
 export type { VibePreset };
 
+export const VIBE_STORAGE_KEY = 'fleeting-garden:vibe';
+
 const VIBE_IDS = new Set<VibeId>(VIBE_PRESETS.map((vibe) => vibe.id));
 
 const isVibeId = (value: unknown): value is VibeId =>
@@ -15,12 +17,11 @@ const isVibeId = (value: unknown): value is VibeId =>
 
 export const getInitialVibe = (): VibePreset => {
   const uriVibeId = getCurrentUriVibeId();
-  const storedVibeId = readBrowserStorage(appConfig.storage.vibeKey);
+  const storedVibeId = readBrowserStorage(VIBE_STORAGE_KEY);
   const storedOrLegacyVibeId = isVibeId(storedVibeId)
     ? storedVibeId
     : getVibeIdFromUri(`?vibe=${encodeURIComponent(storedVibeId ?? '')}`);
-  const initialVibeId =
-    uriVibeId ?? storedOrLegacyVibeId ?? appConfig.vibes.defaultVibeId;
+  const initialVibeId = uriVibeId ?? storedOrLegacyVibeId ?? defaultVibeId;
 
   return getVibeById(initialVibeId) ?? VIBE_PRESETS[0];
 };