diff --git a/src/App.vue b/src/App.vue
index 173f838..d417eed 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -5,6 +5,7 @@ import './styles/tokens.css';
 import './styles/base.css';
 import './styles/layout.css';
 import './styles/components.css';
+import './styles/world.css';
 import './styles/print.css';
 
 defineProps<{ inputs: Readonly<ProductionInputs> }>();
diff --git a/src/components/AppShell.vue b/src/components/AppShell.vue
index ddc5e24..381d65b 100644
--- a/src/components/AppShell.vue
+++ b/src/components/AppShell.vue
@@ -1,14 +1,23 @@
 <script setup lang="ts">
-import { computed } from 'vue';
+import { computed, onMounted, onUnmounted, shallowRef, watch } from 'vue';
 import ContactDestination from './ContactDestination.vue';
+import DriveControls from './DriveControls.vue';
 import ExperienceTimeline from './ExperienceTimeline.vue';
 import InfrastructureDiagram from './InfrastructureDiagram.vue';
+import JourneyHud from './JourneyHud.vue';
 import PortfolioSection from './PortfolioSection.vue';
 import ProjectCard from './ProjectCard.vue';
 import ProjectCaseStudy from './ProjectCaseStudy.vue';
+import SceneCanvas from './SceneCanvas.vue';
 import SiteNavigation from './SiteNavigation.vue';
 import ToolkitGrid from './ToolkitGrid.vue';
+import { useAdaptiveQuality } from '@/composables/useAdaptiveQuality';
+import { useJourneySections } from '@/composables/useJourneySections';
+import { useKeyboardNavigation } from '@/composables/useKeyboardNavigation';
+import { useMotionPreferences } from '@/composables/useMotionPreferences';
 import type { PortfolioContent, SectionId } from '@/content/types';
+import type { SceneHostState } from '@/composables/useSceneController';
+import type { MotionPolicy, QualityTier } from '@/journey/motion-policy';
 
 const props = defineProps<{ content: Readonly<PortfolioContent> }>();
 
@@ -27,15 +36,98 @@ const sectionLabel = (id: SectionId): string => {
 };
 
 const canonicalNavigation = computed(() => canonicalSectionIds.map((id) => ({ id, label: sectionLabel(id) })));
+const motion = useMotionPreferences();
+const navigation = useKeyboardNavigation(canonicalSectionIds);
+const journey = useJourneySections(
+  canonicalSectionIds,
+  navigation.state,
+  computed(() => motion.policy.value.allowSceneRequest),
+);
+const sceneState = shallowRef<SceneHostState>('idle');
+const pageLifecycle = shallowRef<'active' | 'frozen' | 'disposed'>('active');
+const controlsReady = shallowRef(false);
+const adaptive = useAdaptiveQuality({
+  maximum: computed(() => motion.policy.value.maximumTier),
+  sceneState,
+  pageLifecycle,
+});
+const actualQuality = computed(() => adaptive.snapshot.value.actual);
+const activeSectionLabel = computed(() => sectionLabel(journey.value.activeSectionId));
+const serverDefaultPolicy: MotionPolicy = {
+  allowSceneRequest: false,
+  allowAutomaticVideo: false,
+  maximumTier: 'high',
+  reason: 'full',
+};
+const displayedPolicy = computed(() => controlsReady.value ? motion.policy.value : serverDefaultPolicy);
+const displayedQuality = computed<QualityTier>(() => controlsReady.value ? actualQuality.value : 'high');
+const displayedSceneState = computed(() => controlsReady.value ? sceneState.value : 'running');
+let removePageListeners = (): void => {};
+
+watch(
+  () => journey.value.activeSectionId,
+  (id) => navigation.notePassiveSection(id),
+);
+
+watch(
+  () => motion.policy.value.maximumTier,
+  (tier, previous) => {
+    if (tier !== previous) adaptive.setMaximum(tier, 'manual');
+  },
+);
+
+const setQuality = (tier: import('@/journey/motion-policy').QualityTier): void => {
+  motion.setMaximumQuality(tier);
+  adaptive.setMaximum(tier, 'manual');
+};
+
+const enableMotion = (): void => {
+  const tier = motion.maximumQuality.value === 'static' ? 'high' : motion.maximumQuality.value;
+  motion.setMaximumQuality(tier);
+  motion.setPaused(false);
+  adaptive.setMaximum(tier, 'manual');
+};
+
+onMounted(() => {
+  controlsReady.value = true;
+  const onPageHide = (event: PageTransitionEvent): void => {
+    pageLifecycle.value = event.persisted ? 'frozen' : 'disposed';
+  };
+  const onPageShow = (): void => { pageLifecycle.value = 'active'; };
+  window.addEventListener('pagehide', onPageHide);
+  window.addEventListener('pageshow', onPageShow);
+  removePageListeners = () => {
+    window.removeEventListener('pagehide', onPageHide);
+    window.removeEventListener('pageshow', onPageShow);
+  };
+});
+
+onUnmounted(() => removePageListeners());
 </script>
 
 <template>
   <a class="skip-link" href="#portfolio-content">Skip to portfolio content</a>
+  <SceneCanvas
+    :journey="journey"
+    :policy="motion.policy.value"
+    :quality="actualQuality"
+    :scene-description="content.sceneDescription"
+    @state-change="sceneState = $event"
+  />
+  <JourneyHud
+    :journey="journey"
+    :section-label="activeSectionLabel"
+    :quality="displayedQuality"
+  />
   <header class="site-header">
     <h1>{{ content.identity.name }}</h1>
     <p>{{ content.identity.role }}</p>
     <p class="print-portfolio-label" aria-hidden="true">Portfolio</p>
-    <SiteNavigation :items="canonicalNavigation" />
+    <SiteNavigation
+      :items="canonicalNavigation"
+      :journey="journey"
+      :on-section-link-click="navigation.onSectionLinkClick"
+    />
   </header>
 
   <main id="portfolio-content" class="portfolio-main" tabindex="-1">
@@ -79,4 +171,13 @@ const canonicalNavigation = computed(() => canonicalSectionIds.map((id) => ({ id
       </footer>
     </PortfolioSection>
   </main>
+  <DriveControls
+    :policy="displayedPolicy"
+    :maximum-quality="controlsReady ? motion.maximumQuality.value : 'high'"
+    :scene-status="displayedSceneState"
+    @pause="motion.setPaused(true)"
+    @resume="motion.setPaused(false)"
+    @enable="enableMotion"
+    @quality-change="setQuality"
+  />
 </template>
diff --git a/src/components/DriveControls.vue b/src/components/DriveControls.vue
new file mode 100644
index 0000000..2cfc5d8
--- /dev/null
+++ b/src/components/DriveControls.vue
@@ -0,0 +1,64 @@
+<script setup lang="ts">
+import { computed } from 'vue';
+import type { MotionPolicy, QualityTier } from '@/journey/motion-policy';
+
+const props = defineProps<{
+  policy: MotionPolicy;
+  maximumQuality: QualityTier;
+  sceneStatus: string;
+}>();
+
+const emit = defineEmits<{
+  pause: [];
+  resume: [];
+  enable: [];
+  qualityChange: [quality: QualityTier];
+}>();
+
+const action = computed(() => {
+  if (props.policy.reason === 'visitor-pause') return { label: 'Resume motion', event: 'resume' as const };
+  if (props.policy.reason === 'saved-static') return { label: 'Enable motion', event: 'enable' as const };
+  if (props.policy.reason === 'full') return { label: 'Pause motion', event: 'pause' as const };
+  return null;
+});
+
+const statusText = computed(() => {
+  if (props.policy.reason === 'system-reduce') return 'Motion: static — reduced motion requested';
+  if (props.policy.reason === 'data-saver') return 'Motion: static — data saver is active';
+  if (props.policy.reason === 'visitor-pause') return 'Motion: paused';
+  if (props.policy.reason === 'saved-static') return 'Motion: static';
+  if (props.sceneStatus === 'failed' || props.sceneStatus === 'static') return 'Motion: static — scene unavailable';
+  if (props.sceneStatus === 'loading' || props.sceneStatus === 'idle') return 'Motion: preparing';
+  return 'Motion: active';
+});
+
+const runAction = (): void => {
+  const event = action.value?.event;
+  if (event === 'pause') emit('pause');
+  else if (event === 'resume') emit('resume');
+  else if (event === 'enable') emit('enable');
+};
+
+const changeQuality = (event: Event): void => {
+  const value = (event.currentTarget as HTMLSelectElement).value;
+  if (value === 'high' || value === 'medium' || value === 'low' || value === 'static') {
+    emit('qualityChange', value);
+  }
+};
+</script>
+
+<template>
+  <div class="drive-controls">
+    <button v-if="action" type="button" @click="runAction">{{ action.label }}</button>
+    <label>
+      <span>Quality</span>
+      <select :value="maximumQuality" aria-label="Quality control" @change="changeQuality">
+        <option value="high">High</option>
+        <option value="medium">Medium</option>
+        <option value="low">Low</option>
+        <option value="static">Static</option>
+      </select>
+    </label>
+    <p class="drive-controls__status" role="status">{{ statusText }}</p>
+  </div>
+</template>
diff --git a/src/components/JourneyHud.vue b/src/components/JourneyHud.vue
new file mode 100644
index 0000000..8c750d0
--- /dev/null
+++ b/src/components/JourneyHud.vue
@@ -0,0 +1,23 @@
+<script setup lang="ts">
+import { computed } from 'vue';
+import type { JourneySnapshot } from '@/journey/types';
+import type { QualityTier } from '@/journey/motion-policy';
+
+const props = defineProps<{
+  journey: JourneySnapshot;
+  sectionLabel: string;
+  quality: QualityTier;
+}>();
+
+const routePercent = computed(() => `${Math.round(Math.min(1, Math.max(0, props.journey.routeProgress)) * 100)}%`);
+const qualityLabel = computed(() => props.quality.charAt(0).toUpperCase() + props.quality.slice(1));
+</script>
+
+<template>
+  <aside class="journey-hud" aria-hidden="true">
+    <span class="journey-hud__route">ROUTE {{ routePercent }}</span>
+    <span class="journey-hud__section">{{ sectionLabel }}</span>
+    <span class="journey-hud__quality">{{ qualityLabel }}</span>
+    <strong v-if="journey.arrived" class="journey-hud__arrival">ARRIVED</strong>
+  </aside>
+</template>
diff --git a/src/components/SceneCanvas.vue b/src/components/SceneCanvas.vue
new file mode 100644
index 0000000..83bc681
--- /dev/null
+++ b/src/components/SceneCanvas.vue
@@ -0,0 +1,42 @@
+<script setup lang="ts">
+import { computed, onMounted, ref, toRef, watch } from 'vue';
+import { useSceneController, type SceneHostState } from '@/composables/useSceneController';
+import type { JourneySnapshot } from '@/journey/types';
+import type { MotionPolicy, QualityTier } from '@/journey/motion-policy';
+
+const props = defineProps<{
+  journey: JourneySnapshot;
+  policy: MotionPolicy;
+  quality: QualityTier;
+  sceneDescription: string;
+}>();
+
+const emit = defineEmits<{
+  stateChange: [state: SceneHostState];
+}>();
+
+const canvas = ref<HTMLCanvasElement | null>(null);
+const clientReady = ref(false);
+const journey = toRef(props, 'journey');
+const policy = toRef(props, 'policy');
+const quality = toRef(props, 'quality');
+const scene = useSceneController({ canvas, journey, policy, quality });
+const showCanvas = computed(() => (
+  clientReady.value
+  && policy.value.allowSceneRequest
+  && quality.value !== 'static'
+  && !scene.error.value
+));
+
+watch(scene.state, (state) => emit('stateChange', state), { immediate: true });
+onMounted(() => { clientReady.value = true; });
+</script>
+
+<template>
+  <p id="journey-scene-description" class="visually-hidden">{{ sceneDescription }}</p>
+  <div class="journey-world" aria-hidden="true" :data-scene-state="scene.state">
+    <img class="journey-poster" alt="" width="1600" height="900">
+    <canvas v-if="showCanvas" ref="canvas" class="journey-canvas" aria-hidden="true" />
+  </div>
+  <slot />
+</template>
diff --git a/src/components/SiteNavigation.vue b/src/components/SiteNavigation.vue
index d9f2534..d881686 100644
--- a/src/components/SiteNavigation.vue
+++ b/src/components/SiteNavigation.vue
@@ -1,20 +1,12 @@
 <script setup lang="ts">
-import { watch } from "vue";
 import type { SectionId } from "@/content/types";
-import { useJourneySections } from "@/composables/useJourneySections";
-import { useKeyboardNavigation } from "@/composables/useKeyboardNavigation";
+import type { JourneySnapshot } from '@/journey/types';
 
 const props = defineProps<{
   items: ReadonlyArray<{ id: SectionId; label: string }>;
+  journey: JourneySnapshot;
+  onSectionLinkClick: (event: MouseEvent) => void;
 }>();
-const canonicalIds = props.items.map((item) => item.id);
-const navigation = useKeyboardNavigation(canonicalIds);
-const journey = useJourneySections(canonicalIds, navigation.state);
-
-watch(
-  () => journey.value.activeSectionId,
-  (id) => navigation.notePassiveSection(id),
-);
 </script>
 
 <template>
@@ -24,9 +16,9 @@ watch(
         <a
           :href="`#${item.id}`"
           :aria-current="
-            journey.activeSectionId === item.id ? 'page' : undefined
+            props.journey.activeSectionId === item.id ? 'page' : undefined
           "
-          @click="navigation.onSectionLinkClick"
+          @click="props.onSectionLinkClick"
           >{{ item.label }}</a
         >
       </li>
diff --git a/src/composables/useSceneController.ts b/src/composables/useSceneController.ts
new file mode 100644
index 0000000..4399f72
--- /dev/null
+++ b/src/composables/useSceneController.ts
@@ -0,0 +1,141 @@
+import {
+  onMounted,
+  onUnmounted,
+  readonly,
+  shallowRef,
+  watch,
+  type Ref,
+  type WatchStopHandle,
+} from 'vue';
+import { createSceneController } from '@/scene/create-scene-controller';
+import type { JourneySnapshot } from '@/journey/types';
+import type { MotionPolicy, QualityTier } from '@/journey/motion-policy';
+import type { SceneController, SceneControllerSnapshot } from '@/scene/types';
+
+export type SceneHostState = 'idle' | 'loading' | 'running' | 'paused' | 'static' | 'failed' | 'disposed';
+
+export interface SceneControllerBinding {
+  state: Readonly<Ref<SceneHostState>>;
+  snapshot: Readonly<Ref<SceneControllerSnapshot | null>>;
+  error: Readonly<Ref<boolean>>;
+}
+
+export interface SceneControllerSources {
+  canvas: Readonly<Ref<HTMLCanvasElement | null>>;
+  journey: Readonly<Ref<JourneySnapshot>>;
+  policy: Readonly<Ref<MotionPolicy>>;
+  quality: Readonly<Ref<QualityTier>>;
+}
+
+export function useSceneController(sources: SceneControllerSources): SceneControllerBinding {
+  const state = shallowRef<SceneHostState>('idle');
+  const snapshot = shallowRef<SceneControllerSnapshot | null>(null);
+  const error = shallowRef(false);
+  let controller: SceneController | null = null;
+  let importAbort: AbortController | null = null;
+  let generation = 0;
+  let mounted = false;
+  let stopWatch: WatchStopHandle = () => {};
+  let removePageHide = (): void => {};
+
+  const publish = (): void => {
+    snapshot.value = controller?.snapshot() ?? null;
+    const next = snapshot.value?.state.kind;
+    state.value = next === undefined
+      ? (error.value ? 'failed' : 'static')
+      : next === 'lost' || next === 'restoring' ? 'loading' : next;
+  };
+
+  const disposeActive = (nextState: SceneHostState): void => {
+    generation += 1;
+    importAbort?.abort();
+    importAbort = null;
+    const active = controller;
+    controller = null;
+    active?.dispose();
+    snapshot.value = active?.snapshot() ?? null;
+    state.value = nextState;
+  };
+
+  const reconcile = async (): Promise<void> => {
+    if (!mounted) return;
+    const allowed = sources.policy.value.allowSceneRequest && sources.quality.value !== 'static';
+    const canvas = sources.canvas.value;
+    if (!allowed || canvas === null) {
+      disposeActive(allowed ? 'idle' : 'static');
+      return;
+    }
+
+    if (controller !== null) {
+      controller.update(sources.journey.value);
+      await controller.setQuality(sources.quality.value);
+      publish();
+      return;
+    }
+
+    const currentGeneration = ++generation;
+    const abort = new AbortController();
+    importAbort = abort;
+    error.value = false;
+    state.value = 'loading';
+    try {
+      const { createProceduralSceneGeneration } = await import('@/scene/world/environment');
+      if (
+        abort.signal.aborted
+        || !mounted
+        || currentGeneration !== generation
+        || !sources.policy.value.allowSceneRequest
+        || sources.quality.value === 'static'
+        || sources.canvas.value !== canvas
+      ) return;
+
+      const next = createSceneController({
+        canvas,
+        quality: sources.quality.value,
+        build: createProceduralSceneGeneration,
+        motionAllowed: () => sources.policy.value.allowSceneRequest,
+        signal: abort.signal,
+      });
+      controller = next;
+      next.update(sources.journey.value);
+      await next.start();
+      if (controller !== next || currentGeneration !== generation) {
+        next.dispose();
+        return;
+      }
+      const kind = next.snapshot().state.kind;
+      error.value = kind === 'static';
+      publish();
+    } catch {
+      if (!abort.signal.aborted && currentGeneration === generation) {
+        error.value = true;
+        disposeActive('failed');
+      }
+    } finally {
+      if (importAbort === abort) importAbort = null;
+    }
+  };
+
+  onMounted(() => {
+    mounted = true;
+    const onPageHide = (event: PageTransitionEvent): void => {
+      if (!event.persisted) disposeActive('disposed');
+    };
+    window.addEventListener('pagehide', onPageHide);
+    removePageHide = () => window.removeEventListener('pagehide', onPageHide);
+    stopWatch = watch(
+      [sources.canvas, sources.policy, sources.quality, sources.journey],
+      () => { void reconcile(); },
+      { immediate: true, flush: 'post' },
+    );
+  });
+
+  onUnmounted(() => {
+    mounted = false;
+    stopWatch();
+    removePageHide();
+    disposeActive('disposed');
+  });
+
+  return { state: readonly(state), snapshot: readonly(snapshot), error: readonly(error) };
+}
diff --git a/src/styles/world.css b/src/styles/world.css
new file mode 100644
index 0000000..4f4fcb3
--- /dev/null
+++ b/src/styles/world.css
@@ -0,0 +1,158 @@
+.visually-hidden {
+  position: absolute !important;
+  inline-size: 1px !important;
+  block-size: 1px !important;
+  margin: -1px !important;
+  overflow: hidden !important;
+  clip-path: inset(50%) !important;
+  white-space: nowrap !important;
+}
+
+.journey-world {
+  position: fixed;
+  z-index: 0;
+  inset: 0;
+  overflow: hidden;
+  pointer-events: none;
+  background: #040713;
+}
+
+.journey-poster,
+.journey-canvas {
+  position: absolute;
+  inset: 0;
+  inline-size: 100%;
+  block-size: 100%;
+}
+
+.journey-poster {
+  object-fit: cover;
+  background:
+    radial-gradient(circle at 50% 53%, rgb(247 105 115 / 82%) 0 7%, transparent 7.3%),
+    linear-gradient(165deg, transparent 0 60%, rgb(73 198 215 / 34%) 60.2% 60.5%, transparent 60.7%),
+    linear-gradient(195deg, transparent 0 60%, rgb(73 198 215 / 34%) 60.2% 60.5%, transparent 60.7%),
+    linear-gradient(180deg, #050817 0 48%, #24142c 67%, #080c17 100%);
+}
+
+.journey-canvas {
+  max-inline-size: none;
+}
+
+.portfolio-shell {
+  position: relative;
+  z-index: 1;
+}
+
+.site-header {
+  background: rgb(7 13 23 / 96%);
+}
+
+.portfolio-section {
+  background: rgb(16 23 34 / 94%);
+}
+
+.journey-hud {
+  position: fixed;
+  z-index: 4;
+  inset: auto 1rem 1rem auto;
+  display: grid;
+  grid-template-columns: repeat(2, auto);
+  gap: 0.25rem 0.9rem;
+  min-inline-size: 12rem;
+  padding: 0.75rem 0.9rem;
+  border: 1px solid rgb(128 217 230 / 38%);
+  background: rgb(4 9 18 / 84%);
+  color: var(--text-muted);
+  font: 600 var(--step--1)/1.2 var(--mono);
+  letter-spacing: 0.06em;
+  pointer-events: none;
+}
+
+.journey-hud__section,
+.journey-hud__arrival {
+  color: var(--cyan);
+}
+
+.journey-hud__arrival {
+  grid-column: 1 / -1;
+}
+
+.drive-controls {
+  position: fixed;
+  z-index: 5;
+  inset: auto auto 1rem 1rem;
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.55rem;
+  max-inline-size: calc(100vw - 2rem);
+  padding: 0.55rem;
+  border: 1px solid rgb(128 217 230 / 32%);
+  background: rgb(4 9 18 / 88%);
+  font-family: var(--mono);
+  font-size: var(--step--1);
+}
+
+.drive-controls button,
+.drive-controls select {
+  min-block-size: 44px;
+  border: 1px solid var(--line-strong);
+  background: #101925;
+  color: var(--text);
+}
+
+.drive-controls button {
+  padding-inline: 0.8rem;
+}
+
+.drive-controls label {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.45rem;
+}
+
+.drive-controls select {
+  padding-inline: 0.45rem;
+}
+
+.drive-controls__status {
+  color: var(--text-muted);
+}
+
+@media (max-width: 767px) {
+  .journey-hud {
+    inset: 0.5rem 0.5rem auto auto;
+    min-inline-size: 0;
+    padding: 0.5rem;
+    font-size: 0.72rem;
+  }
+
+  .journey-hud__quality {
+    display: none;
+  }
+
+  .drive-controls {
+    inset: auto 0.5rem 0.5rem;
+  }
+
+  .drive-controls__status {
+    flex-basis: 100%;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .journey-poster {
+    background:
+      radial-gradient(circle at 50% 53%, rgb(247 105 115 / 48%) 0 7%, transparent 7.3%),
+      linear-gradient(180deg, #050817 0 48%, #24142c 67%, #080c17 100%);
+  }
+}
+
+@media print {
+  .journey-world,
+  .journey-hud,
+  .drive-controls,
+  #journey-scene-description {
+    display: none !important;
+  }
+}
diff --git a/tests/browser/scene-controls.spec.ts b/tests/browser/scene-controls.spec.ts
new file mode 100644
index 0000000..66be98e
--- /dev/null
+++ b/tests/browser/scene-controls.spec.ts
@@ -0,0 +1,50 @@
+import { expect, test } from '../helpers/serve-dist';
+
+test('keeps the decorative world separate from the semantic reading path', async ({ page, distUrl }) => {
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+
+  await expect(page.locator('#journey-scene-description')).toContainText('night');
+  await expect(page.locator('.journey-world')).toHaveAttribute('aria-hidden', 'true');
+  await expect(page.locator('.journey-poster')).toHaveAttribute('alt', '');
+  await expect(page.locator('.journey-poster')).toHaveAttribute('width', '1600');
+  await expect(page.locator('main#portfolio-content')).toBeVisible();
+});
+
+test('provides native motion and quality controls with visible state', async ({ page, distUrl }) => {
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+
+  const quality = page.getByLabel('Quality control');
+  await expect(quality).toBeVisible();
+  await expect(page.getByRole('button', { name: 'Pause motion' })).toBeVisible();
+  await expect(page.getByRole('status')).toContainText('Motion:');
+
+  await page.getByRole('button', { name: 'Pause motion' }).click();
+  await expect(page.getByRole('button', { name: 'Resume motion' })).toBeVisible();
+  await expect(page.locator('.journey-canvas')).toHaveCount(0);
+
+  await page.getByRole('button', { name: 'Resume motion' }).click();
+  await expect(page.getByRole('button', { name: 'Pause motion' })).toBeVisible();
+
+  await quality.selectOption('static');
+  await expect(page.getByRole('button', { name: 'Enable motion' })).toBeVisible();
+  await expect(page.locator('.journey-canvas')).toHaveCount(0);
+  await expect(page.getByRole('status')).toContainText('Motion: static');
+});
+
+test('never creates a canvas when the system requests reduced motion', async ({ page, distUrl }) => {
+  await page.emulateMedia({ reducedMotion: 'reduce' });
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+
+  await expect(page.locator('.journey-canvas')).toHaveCount(0);
+  await expect(page.getByRole('status')).toContainText('reduced motion requested');
+  await expect(page.getByLabel('Quality control')).toBeVisible();
+});
+
+test('shows ARRIVED from the authoritative section snapshot at Contact', async ({ page, distUrl }) => {
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+  await page.locator('nav a[href="#contact"]').click();
+
+  await expect(page.locator('.journey-hud')).toContainText('Contact');
+  await expect(page.locator('.journey-hud')).toContainText('ARRIVED');
+  await expect(page.locator('.journey-hud')).toContainText('100%');
+});
diff --git a/tests/unit/SceneCanvas.test.ts b/tests/unit/SceneCanvas.test.ts
new file mode 100644
index 0000000..ef23d9e
--- /dev/null
+++ b/tests/unit/SceneCanvas.test.ts
@@ -0,0 +1,168 @@
+import { mount, flushPromises } from '@vue/test-utils';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { nextTick } from 'vue';
+import SceneCanvas from '@/components/SceneCanvas.vue';
+import DriveControls from '@/components/DriveControls.vue';
+import JourneyHud from '@/components/JourneyHud.vue';
+import type { MotionPolicy, QualityTier } from '@/journey/motion-policy';
+import type { JourneySnapshot } from '@/journey/types';
+
+const sceneMocks = vi.hoisted(() => ({
+  build: vi.fn(async () => ({ render: vi.fn(), dispose: vi.fn() })),
+}));
+
+vi.mock('@/scene/world/environment', () => ({
+  createProceduralSceneGeneration: sceneMocks.build,
+}));
+
+const journey = (overrides: Partial<JourneySnapshot> = {}): JourneySnapshot => ({
+  scrollY: 0,
+  routeProgress: 0.42,
+  direction: 1,
+  acceleration: 0.3,
+  driveSpeed: 0.6,
+  activeSectionId: 'infrastructure',
+  chapter: 'infrastructure',
+  sign: null,
+  arrived: false,
+  ...overrides,
+});
+
+const policy = (overrides: Partial<MotionPolicy> = {}): MotionPolicy => ({
+  allowSceneRequest: true,
+  allowAutomaticVideo: true,
+  maximumTier: 'high',
+  reason: 'full',
+  ...overrides,
+});
+
+describe('SceneCanvas', () => {
+  beforeEach(() => sceneMocks.build.mockClear());
+  afterEach(() => vi.restoreAllMocks());
+
+  it.each([
+    ['reduced motion', policy({ allowSceneRequest: false, maximumTier: 'static', reason: 'system-reduce' })],
+    ['saved Static mode', policy({ allowSceneRequest: false, maximumTier: 'static', reason: 'saved-static' })],
+  ])('does not request or render the scene for %s', async (_name, blockedPolicy) => {
+    const wrapper = mount(SceneCanvas, {
+      props: {
+        journey: journey(),
+        policy: blockedPolicy,
+        quality: 'static',
+        sceneDescription: 'A decorative night road behind the portfolio content.',
+      },
+    });
+
+    await flushPromises();
+
+    expect(sceneMocks.build).not.toHaveBeenCalled();
+    expect(wrapper.findAll('canvas')).toHaveLength(0);
+    expect(wrapper.get('img').attributes()).toMatchObject({ alt: '', width: '1600', height: '900' });
+    expect(wrapper.text()).toContain('A decorative night road behind the portfolio content.');
+    wrapper.unmount();
+  });
+
+  it('owns exactly one decorative canvas when full motion is allowed', async () => {
+    const wrapper = mount(SceneCanvas, {
+      props: {
+        journey: journey(),
+        policy: policy(),
+        quality: 'high',
+        sceneDescription: 'A decorative night road behind the portfolio content.',
+      },
+    });
+
+    await flushPromises();
+
+    expect(sceneMocks.build).toHaveBeenCalledTimes(1);
+    expect(wrapper.findAll('canvas')).toHaveLength(1);
+    expect(wrapper.get('canvas').attributes('aria-hidden')).toBe('true');
+    expect(wrapper.get('.journey-world').attributes('aria-hidden')).toBe('true');
+    wrapper.unmount();
+  });
+
+  it('falls back to the poster without obscuring semantic content after scene failure', async () => {
+    sceneMocks.build.mockRejectedValueOnce(new Error('WebGL unavailable'));
+    const wrapper = mount(SceneCanvas, {
+      props: {
+        journey: journey(),
+        policy: policy(),
+        quality: 'medium',
+        sceneDescription: 'A decorative night road behind the portfolio content.',
+      },
+      slots: { default: '<main><h1>Semantic portfolio</h1></main>' },
+    });
+
+    await flushPromises();
+
+    expect(wrapper.get('img').isVisible()).toBe(true);
+    expect(wrapper.findAll('canvas')).toHaveLength(0);
+    expect(wrapper.text()).toContain('Semantic portfolio');
+    wrapper.unmount();
+  });
+
+  it('aborts and removes the canvas on a Static transition', async () => {
+    const wrapper = mount(SceneCanvas, {
+      props: {
+        journey: journey(),
+        policy: policy(),
+        quality: 'high',
+        sceneDescription: 'A decorative night road behind the portfolio content.',
+      },
+    });
+    await flushPromises();
+    expect(wrapper.findAll('canvas')).toHaveLength(1);
+
+    await wrapper.setProps({
+      policy: policy({ allowSceneRequest: false, maximumTier: 'static', reason: 'saved-static' }),
+      quality: 'static',
+    });
+    await nextTick();
+
+    expect(wrapper.findAll('canvas')).toHaveLength(0);
+    expect(wrapper.get('img').isVisible()).toBe(true);
+    wrapper.unmount();
+  });
+});
+
+describe('DriveControls', () => {
+  const mountControls = (motionPolicy: MotionPolicy, maximum: QualityTier = 'high') => mount(DriveControls, {
+    props: { policy: motionPolicy, maximumQuality: maximum, sceneStatus: 'running' },
+  });
+
+  it('uses exact native control names and a visible non-color status', async () => {
+    const wrapper = mountControls(policy());
+
+    expect(wrapper.get('button').text()).toBe('Pause motion');
+    expect(wrapper.get('select').attributes('aria-label')).toBe('Quality control');
+    expect(wrapper.text()).toContain('Motion: active');
+    await wrapper.get('button').trigger('click');
+    expect(wrapper.emitted('pause')).toHaveLength(1);
+  });
+
+  it.each([
+    ['visitor-pause', 'Resume motion'],
+    ['saved-static', 'Enable motion'],
+  ] as const)('offers the correct recovery action for %s', (reason, label) => {
+    const wrapper = mountControls(policy({ allowSceneRequest: false, maximumTier: 'static', reason }));
+    expect(wrapper.get('button').text()).toBe(label);
+  });
+});
+
+describe('JourneyHud', () => {
+  it('renders route percent, current section, quality and arrival from one snapshot', () => {
+    const wrapper = mount(JourneyHud, {
+      props: {
+        journey: journey({ routeProgress: 1, activeSectionId: 'contact', arrived: true }),
+        sectionLabel: 'Contact',
+        quality: 'low',
+      },
+    });
+
+    expect(wrapper.text()).toContain('100%');
+    expect(wrapper.text()).toContain('Contact');
+    expect(wrapper.text()).toContain('Low');
+    expect(wrapper.text()).toContain('ARRIVED');
+    expect(wrapper.attributes('aria-hidden')).toBe('true');
+  });
+});