diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index aa94614d..9d50139f 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -88,10 +88,39 @@ export {
 export { default as useLiveTransforms, type LiveTransform } from './store/use-live-transforms'
 export { clearSceneHistory, default as useScene } from './store/use-scene'
 export { resolveElevatorDispatchTarget } from './systems/elevator/elevator-dispatch'
+export {
+  getElevatorCabCenterZ,
+  getElevatorCabDepth,
+  getElevatorCabWidth,
+  getElevatorDoorLeafSides,
+  getElevatorDoorLeafWidth,
+  getElevatorDoorLeafX,
+  getElevatorShaftDepth,
+  getElevatorShaftWallThickness,
+  getElevatorShaftWidth,
+  getResolvedElevatorDoorPanelStyle,
+  getResolvedElevatorDoorStyle,
+  getResolvedElevatorShaftStyle,
+  type ElevatorDoorSide,
+} from './systems/elevator/elevator-geometry'
 export { syncAutoElevatorOpenings } from './systems/elevator/elevator-opening-sync'
 export { ElevatorOpeningSystem } from './systems/elevator/elevator-opening-system'
 export {
+  createElevatorInteractiveState,
+  openElevatorDoor,
+  openElevatorDoorState,
+  queueElevatorRequest,
+  requestElevatorLevel,
+  stepElevatorRuntimeState,
+  stepElevatorRuntimes,
+} from './systems/elevator/elevator-runtime'
+export { ElevatorRuntimeSystem } from './systems/elevator/elevator-runtime-system'
+export {
+  DEFAULT_ELEVATOR_LEVEL_HEIGHT,
+  type ElevatorLevelEntry,
+  getElevatorLevelHeight,
   resolveElevatorBuildingLevels,
+  resolveElevatorLevels,
   resolveElevatorServiceLevelIds,
   resolveElevatorServiceLevels,
 } from './systems/elevator/elevator-service'
diff --git a/packages/core/src/store/use-interactive.ts b/packages/core/src/store/use-interactive.ts
index 84354557..22997afc 100644
--- a/packages/core/src/store/use-interactive.ts
+++ b/packages/core/src/store/use-interactive.ts
@@ -95,12 +95,6 @@ type InteractiveStore = {
   /** Initialize an elevator's runtime state from its default served level. */
   initElevator: (elevatorId: AnyNodeId, levelId: AnyNodeId, carY: number) => void
 
-  /** Queue a request for an elevator to travel to a level. */
-  requestElevator: (elevatorId: AnyNodeId, levelId: AnyNodeId) => void
-
-  /** Open the elevator doors at the current level when the car is not moving. */
-  openElevatorDoor: (elevatorId: AnyNodeId) => void
-
   /** Merge runtime elevator state. */
   setElevatorState: (elevatorId: AnyNodeId, value: Partial<ElevatorInteractiveState>) => void
 
@@ -252,49 +246,6 @@ export const useInteractive = create<InteractiveStore>((set, get) => ({
     }))
   },
 
-  requestElevator: (elevatorId, levelId) => {
-    set((state) => {
-      const elevator = state.elevators[elevatorId] ?? {
-        currentLevelId: null,
-        targetLevelId: null,
-        carY: 0,
-        doorOpen: 0,
-        phase: 'idle' as const,
-        phaseStartedAt: null,
-        queue: [],
-      }
-      const isAlreadyQueued = elevator.queue.includes(levelId) || elevator.targetLevelId === levelId
-
-      return {
-        elevators: {
-          ...state.elevators,
-          [elevatorId]: {
-            ...elevator,
-            queue: isAlreadyQueued ? elevator.queue : [...elevator.queue, levelId],
-          },
-        },
-      }
-    })
-  },
-
-  openElevatorDoor: (elevatorId) => {
-    set((state) => {
-      const elevator = state.elevators[elevatorId]
-      if (!elevator?.currentLevelId || elevator.phase === 'moving') return state
-
-      return {
-        elevators: {
-          ...state.elevators,
-          [elevatorId]: {
-            ...elevator,
-            phase: 'opening',
-            phaseStartedAt: null,
-          },
-        },
-      }
-    })
-  },
-
   setElevatorState: (elevatorId, value) => {
     set((state) => {
       const current = state.elevators[elevatorId]
diff --git a/packages/core/src/systems/elevator/elevator-geometry.ts b/packages/core/src/systems/elevator/elevator-geometry.ts
new file mode 100644
index 00000000..c08b296b
--- /dev/null
+++ b/packages/core/src/systems/elevator/elevator-geometry.ts
@@ -0,0 +1,92 @@
+import type {
+  ElevatorDoorPanelStyle,
+  ElevatorDoorStyle,
+  ElevatorNode,
+  ElevatorShaftStyle,
+} from '../../schema'
+
+export type ElevatorDoorSide = 'left' | 'right'
+
+const DEFAULT_ELEVATOR_SHAFT_WALL_THICKNESS = 0.09
+
+export function getResolvedElevatorDoorStyle(
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+): ElevatorDoorStyle {
+  return doorStyle ?? 'center-opening'
+}
+
+export function getResolvedElevatorDoorPanelStyle(
+  doorPanelStyle: ElevatorNode['doorPanelStyle'] | undefined,
+): ElevatorDoorPanelStyle {
+  return doorPanelStyle ?? 'glass-frame'
+}
+
+export function getResolvedElevatorShaftStyle(
+  shaftStyle: ElevatorNode['shaftStyle'] | undefined,
+): ElevatorShaftStyle {
+  return shaftStyle ?? 'solid'
+}
+
+export function getElevatorDoorLeafSides(
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+): ElevatorDoorSide[] {
+  const resolvedDoorStyle = getResolvedElevatorDoorStyle(doorStyle)
+  if (resolvedDoorStyle === 'single-left') return ['left']
+  if (resolvedDoorStyle === 'single-right') return ['right']
+  return ['left', 'right']
+}
+
+export function getElevatorDoorLeafX(
+  side: ElevatorDoorSide,
+  openingWidth: number,
+  doorOpen: number,
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+) {
+  const resolvedDoorStyle = getResolvedElevatorDoorStyle(doorStyle)
+  if (resolvedDoorStyle === 'center-opening') {
+    const direction = side === 'left' ? -1 : 1
+    return direction * (openingWidth / 4 + doorOpen * openingWidth * 0.34)
+  }
+
+  const direction = resolvedDoorStyle === 'single-left' ? -1 : 1
+  return direction * doorOpen * openingWidth * 0.68
+}
+
+export function getElevatorDoorLeafWidth(
+  openingWidth: number,
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+) {
+  return getResolvedElevatorDoorStyle(doorStyle) === 'center-opening'
+    ? Math.max(openingWidth / 2 - 0.018, 0.12)
+    : Math.max(openingWidth - 0.018, 0.18)
+}
+
+export function getElevatorCabWidth(node: ElevatorNode) {
+  return Math.max(node.width, 0.8)
+}
+
+export function getElevatorCabDepth(node: ElevatorNode) {
+  return Math.max(node.depth, 0.8)
+}
+
+export function getElevatorShaftWallThickness(node: ElevatorNode) {
+  return Math.max(node.shaftWallThickness ?? DEFAULT_ELEVATOR_SHAFT_WALL_THICKNESS, 0.04)
+}
+
+export function getElevatorShaftWidth(
+  node: ElevatorNode,
+  cabWidth = getElevatorCabWidth(node),
+) {
+  return Math.max(node.shaftWidth ?? cabWidth, cabWidth, 0.8)
+}
+
+export function getElevatorShaftDepth(
+  node: ElevatorNode,
+  cabDepth = getElevatorCabDepth(node),
+) {
+  return Math.max(node.shaftDepth ?? cabDepth, cabDepth, 0.8)
+}
+
+export function getElevatorCabCenterZ(node: ElevatorNode) {
+  return -getElevatorShaftDepth(node) / 2 + getElevatorCabDepth(node) / 2
+}
diff --git a/packages/core/src/systems/elevator/elevator-runtime-system.tsx b/packages/core/src/systems/elevator/elevator-runtime-system.tsx
new file mode 100644
index 00000000..91c897a2
--- /dev/null
+++ b/packages/core/src/systems/elevator/elevator-runtime-system.tsx
@@ -0,0 +1,10 @@
+import { useFrame } from '@react-three/fiber'
+import { stepElevatorRuntimes } from './elevator-runtime'
+
+export function ElevatorRuntimeSystem() {
+  useFrame(({ clock }, delta) => {
+    stepElevatorRuntimes(clock.getElapsedTime() * 1000, delta)
+  }, 2)
+
+  return null
+}
diff --git a/packages/core/src/systems/elevator/elevator-runtime.test.ts b/packages/core/src/systems/elevator/elevator-runtime.test.ts
new file mode 100644
index 00000000..959dd681
--- /dev/null
+++ b/packages/core/src/systems/elevator/elevator-runtime.test.ts
@@ -0,0 +1,79 @@
+import { describe, expect, test } from 'bun:test'
+import type { AnyNodeId } from '../../schema'
+import { ElevatorNode } from '../../schema'
+import {
+  createElevatorInteractiveState,
+  openElevatorDoorState,
+  queueElevatorRequest,
+  stepElevatorRuntimeState,
+} from './elevator-runtime'
+import type { ElevatorLevelEntry } from './elevator-service'
+
+const groundLevelId = 'level_ground' as AnyNodeId
+const upperLevelId = 'level_upper' as AnyNodeId
+
+const entries: ElevatorLevelEntry[] = [
+  { id: groundLevelId as ElevatorLevelEntry['id'], label: '0', baseY: 0 },
+  { id: upperLevelId as ElevatorLevelEntry['id'], label: '1', baseY: 2.5 },
+]
+
+const elevator = ElevatorNode.parse({
+  speed: 10,
+  doorDurationMs: 100,
+  dwellMs: 0,
+})
+
+describe('elevator runtime helpers', () => {
+  test('queues level requests without duplicating the target', () => {
+    const state = createElevatorInteractiveState(groundLevelId, 0)
+    const queued = queueElevatorRequest(state, upperLevelId)
+    const duplicated = queueElevatorRequest(queued, upperLevelId)
+
+    expect(queued.queue).toEqual([upperLevelId])
+    expect(duplicated.queue).toEqual([upperLevelId])
+  })
+
+  test('opens doors only when the elevator is not moving', () => {
+    const idle = createElevatorInteractiveState(groundLevelId, 0)
+    const moving = { ...idle, phase: 'moving' as const }
+
+    expect(openElevatorDoorState(idle).phase).toBe('opening')
+    expect(openElevatorDoorState(moving)).toBe(moving)
+  })
+
+  test('moves to a queued level and clears the served request on arrival', () => {
+    const queued = queueElevatorRequest(createElevatorInteractiveState(groundLevelId, 0), upperLevelId)
+    const moving = stepElevatorRuntimeState({
+      defaultEntry: entries[0]!,
+      delta: 0.016,
+      elevator,
+      entries,
+      now: 0,
+      state: queued,
+    })
+
+    const arrived = stepElevatorRuntimeState({
+      defaultEntry: entries[0]!,
+      delta: 1,
+      elevator,
+      entries,
+      now: 100,
+      state: moving,
+    })
+
+    const open = stepElevatorRuntimeState({
+      defaultEntry: entries[0]!,
+      delta: 1,
+      elevator,
+      entries,
+      now: 200,
+      state: arrived,
+    })
+
+    expect(moving.phase).toBe('moving')
+    expect(arrived.currentLevelId).toBe(upperLevelId)
+    expect(arrived.phase).toBe('opening')
+    expect(open.phase).toBe('open')
+    expect(open.queue).toEqual([])
+  })
+})
diff --git a/packages/core/src/systems/elevator/elevator-runtime.ts b/packages/core/src/systems/elevator/elevator-runtime.ts
new file mode 100644
index 00000000..c75a30bc
--- /dev/null
+++ b/packages/core/src/systems/elevator/elevator-runtime.ts
@@ -0,0 +1,265 @@
+import type { AnyNode, AnyNodeId, ElevatorNode } from '../../schema'
+import { type ElevatorInteractiveState, useInteractive } from '../../store/use-interactive'
+import useScene from '../../store/use-scene'
+import { resolveElevatorLevels, type ElevatorLevelEntry } from './elevator-service'
+
+const EPSILON = 0.001
+
+function moveToward(current: number, target: number, maxDelta: number) {
+  const delta = target - current
+  if (Math.abs(delta) <= maxDelta) return target
+  return current + Math.sign(delta) * maxDelta
+}
+
+export function createElevatorInteractiveState(
+  levelId: AnyNodeId,
+  carY: number,
+): ElevatorInteractiveState {
+  return {
+    currentLevelId: levelId,
+    targetLevelId: null,
+    carY,
+    doorOpen: 0,
+    phase: 'idle',
+    phaseStartedAt: null,
+    queue: [],
+  }
+}
+
+function getInitialElevatorState(
+  elevatorId: AnyNodeId,
+  nodes: Record<string, AnyNode>,
+): ElevatorInteractiveState | null {
+  const node = nodes[elevatorId]
+  if (node?.type !== 'elevator') return null
+
+  const { defaultEntry } = resolveElevatorLevels(node, nodes)
+  if (!defaultEntry) return null
+
+  return createElevatorInteractiveState(defaultEntry.id as AnyNodeId, defaultEntry.baseY)
+}
+
+function ensureElevatorState(
+  elevatorId: AnyNodeId,
+  nodes: Record<string, AnyNode>,
+): ElevatorInteractiveState | null {
+  const interactive = useInteractive.getState()
+  const existing = interactive.elevators[elevatorId]
+  if (existing) return existing
+
+  const initial = getInitialElevatorState(elevatorId, nodes)
+  if (!initial) return null
+
+  interactive.initElevator(elevatorId, initial.currentLevelId as AnyNodeId, initial.carY)
+  return initial
+}
+
+export function queueElevatorRequest(
+  state: ElevatorInteractiveState,
+  levelId: AnyNodeId,
+): ElevatorInteractiveState {
+  const isAlreadyQueued = state.queue.includes(levelId) || state.targetLevelId === levelId
+  if (isAlreadyQueued) return state
+
+  return {
+    ...state,
+    queue: [...state.queue, levelId],
+  }
+}
+
+export function openElevatorDoorState(
+  state: ElevatorInteractiveState,
+): ElevatorInteractiveState {
+  if (!state.currentLevelId || state.phase === 'moving') return state
+
+  return {
+    ...state,
+    phase: 'opening',
+    phaseStartedAt: null,
+  }
+}
+
+export function requestElevatorLevel(elevatorId: AnyNodeId, levelId: AnyNodeId) {
+  const nodes = useScene.getState().nodes
+  const current = ensureElevatorState(elevatorId, nodes)
+  if (!current) return
+
+  const next = queueElevatorRequest(current, levelId)
+  if (next === current) return
+
+  useInteractive.getState().setElevatorState(elevatorId, next)
+}
+
+export function openElevatorDoor(elevatorId: AnyNodeId) {
+  const nodes = useScene.getState().nodes
+  const current = ensureElevatorState(elevatorId, nodes)
+  if (!current) return
+
+  const next = openElevatorDoorState(current)
+  if (next === current) return
+
+  useInteractive.getState().setElevatorState(elevatorId, next)
+}
+
+export function stepElevatorRuntimeState({
+  defaultEntry,
+  delta,
+  elevator,
+  entries,
+  now,
+  state,
+}: {
+  defaultEntry: ElevatorLevelEntry
+  delta: number
+  elevator: ElevatorNode
+  entries: ElevatorLevelEntry[]
+  now: number
+  state: ElevatorInteractiveState
+}): ElevatorInteractiveState {
+  const currentEntry = entries.find((entry) => entry.id === state.currentLevelId) ?? defaultEntry
+  if (currentEntry.id !== state.currentLevelId) {
+    return {
+      ...state,
+      currentLevelId: currentEntry.id as AnyNodeId,
+      carY: currentEntry.baseY,
+      targetLevelId: null,
+      phase: 'idle',
+      phaseStartedAt: null,
+      queue: [],
+      doorOpen: 0,
+    }
+  }
+
+  const targetEntry = state.targetLevelId
+    ? entries.find((entry) => entry.id === state.targetLevelId)
+    : state.queue[0]
+      ? entries.find((entry) => entry.id === state.queue[0])
+      : null
+
+  const doorDurationMs = Math.max(elevator.doorDurationMs ?? 900, 1)
+  const doorStep = (delta * 1000) / doorDurationMs
+
+  switch (state.phase) {
+    case 'idle': {
+      const nextLevelId = state.queue[0] ?? null
+      if (!nextLevelId) {
+        if (state.doorOpen > EPSILON) {
+          return {
+            ...state,
+            doorOpen: Math.max(0, state.doorOpen - doorStep),
+          }
+        }
+        return state
+      }
+
+      return {
+        ...state,
+        targetLevelId: nextLevelId,
+        phase:
+          state.doorOpen > EPSILON
+            ? 'closing'
+            : nextLevelId === state.currentLevelId
+              ? 'opening'
+              : 'moving',
+        phaseStartedAt: now,
+      }
+    }
+
+    case 'closing': {
+      const doorOpen = Math.max(0, state.doorOpen - doorStep)
+      return {
+        ...state,
+        doorOpen,
+        phase: doorOpen <= EPSILON ? (state.targetLevelId ? 'moving' : 'idle') : 'closing',
+        phaseStartedAt: doorOpen <= EPSILON ? now : state.phaseStartedAt,
+      }
+    }
+
+    case 'moving': {
+      if (!targetEntry) {
+        return {
+          ...state,
+          targetLevelId: null,
+          phase: 'idle',
+          queue: [],
+        }
+      }
+
+      const speed = Math.max(elevator.speed ?? 2.2, 0.1)
+      const nextY = moveToward(state.carY, targetEntry.baseY, speed * delta)
+      const arrived = Math.abs(nextY - targetEntry.baseY) <= EPSILON
+      return {
+        ...state,
+        carY: nextY,
+        currentLevelId: arrived ? (targetEntry.id as AnyNodeId) : state.currentLevelId,
+        phase: arrived ? 'opening' : 'moving',
+        phaseStartedAt: arrived ? now : state.phaseStartedAt,
+      }
+    }
+
+    case 'opening': {
+      const doorOpen = Math.min(1, state.doorOpen + doorStep)
+      return {
+        ...state,
+        doorOpen,
+        phase: doorOpen >= 1 - EPSILON ? 'open' : 'opening',
+        phaseStartedAt: doorOpen >= 1 - EPSILON ? now : state.phaseStartedAt,
+        targetLevelId: doorOpen >= 1 - EPSILON ? null : state.targetLevelId,
+        queue:
+          doorOpen >= 1 - EPSILON && state.queue[0] === state.currentLevelId
+            ? state.queue.slice(1)
+            : state.queue,
+      }
+    }
+
+    case 'open': {
+      const elapsed = now - (state.phaseStartedAt ?? now)
+      if (elapsed < Math.max(elevator.dwellMs ?? 1400, 0)) return state
+
+      return {
+        ...state,
+        phase: 'closing',
+        phaseStartedAt: now,
+        targetLevelId: state.queue[0] ?? null,
+      }
+    }
+  }
+}
+
+export function stepElevatorRuntimes(now: number, delta: number) {
+  const nodes = useScene.getState().nodes
+  const interactive = useInteractive.getState()
+
+  for (const elevatorId of Object.keys(interactive.elevators)) {
+    const typedElevatorId = elevatorId as AnyNodeId
+    if (nodes[typedElevatorId]?.type !== 'elevator') {
+      interactive.removeElevator(typedElevatorId)
+    }
+  }
+
+  for (const node of Object.values(nodes)) {
+    if (node.type !== 'elevator') continue
+
+    const elevatorId = node.id as AnyNodeId
+    const { entries, defaultEntry } = resolveElevatorLevels(node, nodes)
+    if (!defaultEntry) continue
+
+    const state = useInteractive.getState().elevators[elevatorId]
+    if (!state) {
+      useInteractive.getState().initElevator(elevatorId, defaultEntry.id as AnyNodeId, defaultEntry.baseY)
+      continue
+    }
+
+    const next = stepElevatorRuntimeState({
+      defaultEntry,
+      delta,
+      elevator: node,
+      entries,
+      now,
+      state,
+    })
+    if (next !== state) {
+      useInteractive.getState().setElevatorState(elevatorId, next)
+    }
+  }
+}
diff --git a/packages/core/src/systems/elevator/elevator-service.ts b/packages/core/src/systems/elevator/elevator-service.ts
index c775d708..59798da5 100644
--- a/packages/core/src/systems/elevator/elevator-service.ts
+++ b/packages/core/src/systems/elevator/elevator-service.ts
@@ -1,4 +1,12 @@
-import type { AnyNode, AnyNodeId, ElevatorNode, LevelNode } from '../../schema'
+import type { AnyNode, AnyNodeId, CeilingNode, ElevatorNode, LevelNode, WallNode } from '../../schema'
+
+export const DEFAULT_ELEVATOR_LEVEL_HEIGHT = 2.5
+
+export type ElevatorLevelEntry = {
+  id: LevelNode['id']
+  label: string
+  baseY: number
+}
 
 function getBuildingLevels(elevator: ElevatorNode, nodes: Record<string, AnyNode>): LevelNode[] {
   const building =
@@ -65,3 +73,78 @@ export function resolveElevatorServiceLevels(
 
   return levels.slice(minIndex, maxIndex + 1)
 }
+
+export function getElevatorLevelHeight(levelId: string, nodes: Record<string, AnyNode>): number {
+  const level = nodes[levelId as AnyNodeId] as LevelNode | undefined
+  if (!level || level.type !== 'level') return DEFAULT_ELEVATOR_LEVEL_HEIGHT
+
+  let maxTop = 0
+
+  for (const childId of level.children) {
+    const child = nodes[childId as AnyNodeId]
+    if (!child) continue
+
+    if (child.type === 'ceiling') {
+      const height = (child as CeilingNode).height ?? DEFAULT_ELEVATOR_LEVEL_HEIGHT
+      if (height > maxTop) maxTop = height
+    } else if (child.type === 'wall') {
+      const height = (child as WallNode).height ?? DEFAULT_ELEVATOR_LEVEL_HEIGHT
+      if (height > maxTop) maxTop = height
+    }
+  }
+
+  return maxTop > 0 ? maxTop : DEFAULT_ELEVATOR_LEVEL_HEIGHT
+}
+
+export function resolveElevatorLevels(
+  elevator: ElevatorNode,
+  nodes: Record<string, AnyNode>,
+): {
+  entries: ElevatorLevelEntry[]
+  defaultEntry: ElevatorLevelEntry | null
+  shaftBaseY: number
+  shaftTopY: number
+  totalHeight: number
+} {
+  const allLevels = resolveElevatorBuildingLevels(elevator, nodes)
+
+  const baseYByLevelId = new Map<string, number>()
+  let cumulativeY = 0
+  for (const level of allLevels) {
+    baseYByLevelId.set(level.id, cumulativeY)
+    cumulativeY += getElevatorLevelHeight(level.id, nodes)
+  }
+
+  const serviceLevels = resolveElevatorServiceLevels(elevator, nodes)
+  const entries = serviceLevels.map((level) => ({
+    id: level.id,
+    label: String(level.level),
+    baseY: baseYByLevelId.get(level.id) ?? 0,
+  }))
+
+  const defaultEntry =
+    entries.find((entry) => entry.id === elevator.defaultLevelId) ??
+    entries.find((entry) => entry.id === elevator.fromLevelId) ??
+    entries[0] ??
+    null
+  const firstServedLevel = serviceLevels[0] ?? null
+  const lastServedLevel = serviceLevels[serviceLevels.length - 1] ?? null
+  const shaftBaseY = firstServedLevel ? (baseYByLevelId.get(firstServedLevel.id) ?? 0) : 0
+  const lastServedIndex = lastServedLevel
+    ? allLevels.findIndex((level) => level.id === lastServedLevel.id)
+    : -1
+  const nextLevel = lastServedIndex >= 0 ? allLevels[lastServedIndex + 1] : null
+  const shaftTopY = nextLevel
+    ? (baseYByLevelId.get(nextLevel.id) ?? cumulativeY)
+    : lastServedLevel
+      ? cumulativeY
+      : elevator.cabHeight + 0.3
+
+  return {
+    entries,
+    defaultEntry,
+    shaftBaseY,
+    shaftTopY,
+    totalHeight: Math.max(shaftTopY - shaftBaseY, elevator.cabHeight + 0.3),
+  }
+}
diff --git a/packages/editor/src/components/editor/first-person-controls.tsx b/packages/editor/src/components/editor/first-person-controls.tsx
index 02e7a01c..2b0074fd 100644
--- a/packages/editor/src/components/editor/first-person-controls.tsx
+++ b/packages/editor/src/components/editor/first-person-controls.tsx
@@ -5,10 +5,23 @@ import {
   type AnyNode,
   type AnyNodeId,
   type ElevatorNode,
+  type ElevatorDoorSide,
   emitter,
+  getElevatorCabCenterZ,
+  getElevatorCabDepth,
+  getElevatorCabWidth,
+  getElevatorDoorLeafSides,
+  getElevatorDoorLeafWidth,
+  getElevatorDoorLeafX,
+  getElevatorShaftDepth,
+  getElevatorShaftWallThickness,
+  getElevatorShaftWidth,
+  getResolvedElevatorDoorStyle,
+  openElevatorDoor,
   resolveElevatorBuildingLevels,
   resolveElevatorDispatchTarget,
   resolveElevatorServiceLevels,
+  requestElevatorLevel,
   sceneRegistry,
   useInteractive,
   useScene,
@@ -62,7 +75,6 @@ const DOOR_LEAF_INTERACTION_DEPTH = 0.08
 const ELEVATOR_RIDE_HORIZONTAL_PADDING = 0.18
 const ELEVATOR_COLLIDER_HORIZONTAL_PADDING = 0.14
 const ELEVATOR_COLLIDER_FLOOR_THICKNESS = 0.08
-const ELEVATOR_COLLIDER_WALL_THICKNESS = 0.16
 const ELEVATOR_COLLIDER_DOOR_DEPTH = 0.12
 const ELEVATOR_ENTRY_DOOR_OPEN_THRESHOLD = 0.72
 const DEFAULT_ELEVATOR_LEVEL_HEIGHT = 2.5
@@ -133,9 +145,6 @@ type ElevatorColliderUserData = {
   side?: ElevatorDoorSide
 }
 
-type ElevatorDoorSide = 'left' | 'right'
-type ElevatorDoorStyleValue = ElevatorNode['doorStyle']
-
 type ElevatorColliderMesh = Mesh & {
   userData: Mesh['userData'] & ElevatorColliderUserData
 }
@@ -217,67 +226,6 @@ function getInteractableTargetKey(target: FirstPersonInteractableTarget | null)
     : `${target.type}:${target.id}`
 }
 
-function getResolvedElevatorDoorStyle(
-  doorStyle: ElevatorDoorStyleValue | undefined,
-): ElevatorDoorStyleValue {
-  return doorStyle ?? 'center-opening'
-}
-
-function getElevatorDoorLeafSides(
-  doorStyle: ElevatorDoorStyleValue | undefined,
-): ElevatorDoorSide[] {
-  const resolvedDoorStyle = getResolvedElevatorDoorStyle(doorStyle)
-  if (resolvedDoorStyle === 'single-left') return ['left']
-  if (resolvedDoorStyle === 'single-right') return ['right']
-  return ['left', 'right']
-}
-
-function getElevatorDoorLeafWidth(width: number, doorStyle: ElevatorDoorStyleValue | undefined) {
-  return getResolvedElevatorDoorStyle(doorStyle) === 'center-opening'
-    ? Math.max(width / 2 - 0.018, 0.12)
-    : Math.max(width - 0.018, 0.18)
-}
-
-function getElevatorDoorLeafX(
-  side: ElevatorDoorSide,
-  width: number,
-  doorOpen: number,
-  doorStyle: ElevatorDoorStyleValue | undefined,
-) {
-  const resolvedDoorStyle = getResolvedElevatorDoorStyle(doorStyle)
-  if (resolvedDoorStyle === 'center-opening') {
-    const direction = side === 'left' ? -1 : 1
-    return direction * (width / 4 + doorOpen * width * 0.34)
-  }
-
-  const direction = resolvedDoorStyle === 'single-left' ? -1 : 1
-  return direction * doorOpen * width * 0.68
-}
-
-function getElevatorCabWidth(elevator: ElevatorNode) {
-  return Math.max(elevator.width, 0.8)
-}
-
-function getElevatorCabDepth(elevator: ElevatorNode) {
-  return Math.max(elevator.depth, 0.8)
-}
-
-function getElevatorShaftWallThickness(elevator: ElevatorNode) {
-  return Math.max(elevator.shaftWallThickness ?? ELEVATOR_COLLIDER_WALL_THICKNESS, 0.04)
-}
-
-function getElevatorShaftWidth(elevator: ElevatorNode, cabWidth = getElevatorCabWidth(elevator)) {
-  return Math.max(elevator.shaftWidth ?? cabWidth, cabWidth, 0.8)
-}
-
-function getElevatorShaftDepth(elevator: ElevatorNode, cabDepth = getElevatorCabDepth(elevator)) {
-  return Math.max(elevator.shaftDepth ?? cabDepth, cabDepth, 0.8)
-}
-
-function getElevatorCabCenterZ(elevator: ElevatorNode) {
-  return -getElevatorShaftDepth(elevator) / 2 + getElevatorCabDepth(elevator) / 2
-}
-
 function isDynamicElevatorCollider(kind: ElevatorColliderKind) {
   return kind.startsWith('cab-') || kind.startsWith('landing-door')
 }
@@ -836,7 +784,7 @@ export const FirstPersonControls = () => {
         }
       }
       if (target.action === 'open-door') {
-        useInteractive.getState().openElevatorDoor(target.id)
+        openElevatorDoor(target.id)
         return
       }
       if (target.levelId) {
@@ -849,7 +797,7 @@ export const FirstPersonControls = () => {
                 requestedElevatorId: target.id,
               })
             : target.id
-        useInteractive.getState().requestElevator(targetElevatorId, target.levelId)
+        requestElevatorLevel(targetElevatorId, target.levelId)
       }
       return
     }
diff --git a/packages/editor/src/components/ui/panels/elevator-panel.tsx b/packages/editor/src/components/ui/panels/elevator-panel.tsx
index 1e95f00d..02bbc4aa 100644
--- a/packages/editor/src/components/ui/panels/elevator-panel.tsx
+++ b/packages/editor/src/components/ui/panels/elevator-panel.tsx
@@ -6,6 +6,7 @@ import {
   type ElevatorNode,
   ElevatorNode as ElevatorNodeSchema,
   type LevelNode,
+  requestElevatorLevel,
   useInteractive,
   useLiveNodeOverrides,
   useLiveTransforms,
@@ -337,7 +338,7 @@ export function ElevatorPanel() {
     (levelId: LevelNode['id']) => {
       if (!node) return
       if ((node.disabledLevelIds ?? []).includes(levelId)) return
-      useInteractive.getState().requestElevator(node.id as AnyNodeId, levelId as AnyNodeId)
+      requestElevatorLevel(node.id as AnyNodeId, levelId as AnyNodeId)
     },
     [node],
   )
diff --git a/packages/viewer/src/components/renderers/elevator/elevator-renderer.tsx b/packages/viewer/src/components/renderers/elevator/elevator-renderer.tsx
index 8aa0815e..facfe5c8 100644
--- a/packages/viewer/src/components/renderers/elevator/elevator-renderer.tsx
+++ b/packages/viewer/src/components/renderers/elevator/elevator-renderer.tsx
@@ -1,7 +1,20 @@
 import {
   type AnyNode,
   type AnyNodeId,
+  type ElevatorDoorSide,
   type ElevatorNode,
+  getElevatorCabDepth,
+  getElevatorCabWidth,
+  getElevatorDoorLeafSides,
+  getElevatorDoorLeafWidth,
+  getElevatorDoorLeafX,
+  getElevatorShaftDepth,
+  getElevatorShaftWallThickness,
+  getElevatorShaftWidth,
+  getResolvedElevatorDoorPanelStyle as getResolvedDoorPanelStyle,
+  getResolvedElevatorDoorStyle as getResolvedDoorStyle,
+  getResolvedElevatorShaftStyle as getResolvedShaftStyle,
+  resolveElevatorLevels,
   useInteractive,
   useLiveNodeOverrides,
   useLiveTransforms,
@@ -21,7 +34,6 @@ import {
 } from 'three'
 import { useShallow } from 'zustand/react/shallow'
 import { useNodeEvents } from '../../../hooks/use-node-events'
-import { resolveElevatorLevels } from '../../../systems/elevator/elevator-utils'
 
 const SHAFT_WALL_COLOR = '#d7dce4'
 const SHAFT_SIDE_COLOR = '#4b5563'
@@ -30,7 +42,6 @@ const CAB_COLOR = '#d7dde5'
 const GLASS_COLOR = '#f8fafc'
 const DOOR_COLOR = '#8e98a6'
 const PANEL_COLOR = '#1f2937'
-const DEFAULT_SHAFT_WALL_THICKNESS = 0.09
 
 type Vector3Tuple = [number, number, number]
 
@@ -41,10 +52,8 @@ const BUTTON_RING_GEOMETRY = new TorusGeometry(1.12, 0.12, 8, 24)
 const LABEL_MATRIX_DUMMY = new Object3D()
 const SHAFT_TOP_FRAME_CLEARANCE = 0.006
 
-type ElevatorDoorSide = 'left' | 'right'
 type ElevatorDoorPanelStyleValue = ElevatorNode['doorPanelStyle']
 type ElevatorDoorStyleValue = ElevatorNode['doorStyle']
-type ElevatorShaftStyleValue = ElevatorNode['shaftStyle']
 
 const SHAFT_WALL_MATERIAL = new MeshStandardMaterial({
   color: SHAFT_WALL_COLOR,
@@ -611,78 +620,6 @@ function ElevatorMeshButton({
   )
 }
 
-function getResolvedDoorStyle(
-  doorStyle: ElevatorDoorStyleValue | undefined,
-): ElevatorDoorStyleValue {
-  return doorStyle ?? 'center-opening'
-}
-
-function getResolvedDoorPanelStyle(
-  doorPanelStyle: ElevatorDoorPanelStyleValue | undefined,
-): ElevatorDoorPanelStyleValue {
-  return doorPanelStyle ?? 'glass-frame'
-}
-
-function getResolvedShaftStyle(
-  shaftStyle: ElevatorShaftStyleValue | undefined,
-): ElevatorShaftStyleValue {
-  return shaftStyle ?? 'solid'
-}
-
-function getElevatorDoorLeafSides(
-  doorStyle: ElevatorDoorStyleValue | undefined,
-): ElevatorDoorSide[] {
-  const resolvedDoorStyle = getResolvedDoorStyle(doorStyle)
-  if (resolvedDoorStyle === 'single-left') return ['left']
-  if (resolvedDoorStyle === 'single-right') return ['right']
-  return ['left', 'right']
-}
-
-function getElevatorDoorLeafX(
-  side: ElevatorDoorSide,
-  openingWidth: number,
-  doorOpen: number,
-  doorStyle: ElevatorDoorStyleValue | undefined,
-) {
-  const resolvedDoorStyle = getResolvedDoorStyle(doorStyle)
-  if (resolvedDoorStyle === 'center-opening') {
-    const direction = side === 'left' ? -1 : 1
-    return direction * (openingWidth / 4 + doorOpen * openingWidth * 0.34)
-  }
-
-  const direction = resolvedDoorStyle === 'single-left' ? -1 : 1
-  return direction * doorOpen * openingWidth * 0.68
-}
-
-function getElevatorDoorLeafWidth(
-  openingWidth: number,
-  doorStyle: ElevatorDoorStyleValue | undefined,
-) {
-  return getResolvedDoorStyle(doorStyle) === 'center-opening'
-    ? Math.max(openingWidth / 2 - 0.018, 0.12)
-    : Math.max(openingWidth - 0.018, 0.18)
-}
-
-function getElevatorCabWidth(node: ElevatorNode) {
-  return Math.max(node.width, 0.8)
-}
-
-function getElevatorCabDepth(node: ElevatorNode) {
-  return Math.max(node.depth, 0.8)
-}
-
-function getElevatorShaftWallThickness(node: ElevatorNode) {
-  return Math.max(node.shaftWallThickness ?? DEFAULT_SHAFT_WALL_THICKNESS, 0.04)
-}
-
-function getElevatorShaftWidth(node: ElevatorNode, cabWidth = getElevatorCabWidth(node)) {
-  return Math.max(node.shaftWidth ?? cabWidth, cabWidth, 0.8)
-}
-
-function getElevatorShaftDepth(node: ElevatorNode, cabDepth = getElevatorCabDepth(node)) {
-  return Math.max(node.shaftDepth ?? cabDepth, cabDepth, 0.8)
-}
-
 function getElevatorLevelContextNodes(
   elevator: ElevatorNode,
   nodes: ReturnType<typeof useScene.getState>['nodes'],
diff --git a/packages/viewer/src/components/viewer/index.tsx b/packages/viewer/src/components/viewer/index.tsx
index 1c8404fd..b620ad9d 100644
--- a/packages/viewer/src/components/viewer/index.tsx
+++ b/packages/viewer/src/components/viewer/index.tsx
@@ -1,6 +1,6 @@
 'use client'
 
-import { ElevatorOpeningSystem } from '@pascal-app/core'
+import { ElevatorOpeningSystem, ElevatorRuntimeSystem } from '@pascal-app/core'
 import { Canvas, extend, type ThreeToJSXElements, useFrame, useThree } from '@react-three/fiber'
 import { useEffect, useMemo, useRef } from 'react'
 import * as THREE from 'three/webgpu'
@@ -8,7 +8,6 @@ import useViewer from '../../store/use-viewer'
 import { CeilingSystem } from '../../systems/ceiling/ceiling-system'
 import { DoorAnimationSystem } from '../../systems/door/door-animation-system'
 import { DoorSystem } from '../../systems/door/door-system'
-import { ElevatorAnimationSystem } from '../../systems/elevator/elevator-animation-system'
 import { ElevatorInteractionSystem } from '../../systems/elevator/elevator-interaction-system'
 import { FenceSystem } from '../../systems/fence/fence-system'
 import { GuideSystem } from '../../systems/guide/guide-system'
@@ -225,7 +224,7 @@ const Viewer: React.FC<ViewerProps> = ({
         {/* Core systems */}
         <CeilingSystem />
         <DoorAnimationSystem />
-        <ElevatorAnimationSystem />
+        <ElevatorRuntimeSystem />
         <ElevatorInteractionSystem />
         <ElevatorOpeningSystem />
         <WindowAnimationSystem />
diff --git a/packages/viewer/src/systems/elevator/elevator-animation-system.tsx b/packages/viewer/src/systems/elevator/elevator-animation-system.tsx
deleted file mode 100644
index f512579e..00000000
--- a/packages/viewer/src/systems/elevator/elevator-animation-system.tsx
+++ /dev/null
@@ -1,162 +0,0 @@
-import {
-  type AnyNodeId,
-  type ElevatorNode,
-  sceneRegistry,
-  useInteractive,
-  useScene,
-} from '@pascal-app/core'
-import { useFrame } from '@react-three/fiber'
-import { resolveElevatorLevels } from './elevator-utils'
-
-const EPSILON = 0.001
-
-function moveToward(current: number, target: number, maxDelta: number) {
-  const delta = target - current
-  if (Math.abs(delta) <= maxDelta) return target
-  return current + Math.sign(delta) * maxDelta
-}
-
-export function ElevatorAnimationSystem() {
-  useFrame(({ clock }, delta) => {
-    const interactive = useInteractive.getState()
-    const nodes = useScene.getState().nodes
-    const now = clock.getElapsedTime() * 1000
-
-    for (const elevatorId of Object.keys(interactive.elevators)) {
-      const typedElevatorId = elevatorId as AnyNodeId
-      if (nodes[typedElevatorId]?.type !== 'elevator') {
-        interactive.removeElevator(typedElevatorId)
-      }
-    }
-
-    for (const elevatorId of sceneRegistry.byType.elevator) {
-      const typedElevatorId = elevatorId as AnyNodeId
-      const node = nodes[typedElevatorId]
-      if (node?.type !== 'elevator') {
-        interactive.removeElevator(typedElevatorId)
-        continue
-      }
-
-      const elevator = node as ElevatorNode
-      const { entries, defaultEntry } = resolveElevatorLevels(elevator, nodes)
-      if (!defaultEntry) continue
-
-      const state = interactive.elevators[typedElevatorId]
-      if (!state) {
-        interactive.initElevator(typedElevatorId, defaultEntry.id as AnyNodeId, defaultEntry.baseY)
-        continue
-      }
-
-      const currentEntry =
-        entries.find((entry) => entry.id === state.currentLevelId) ?? defaultEntry
-      if (currentEntry.id !== state.currentLevelId) {
-        interactive.setElevatorState(typedElevatorId, {
-          currentLevelId: currentEntry.id as AnyNodeId,
-          carY: currentEntry.baseY,
-          targetLevelId: null,
-          phase: 'idle',
-          phaseStartedAt: null,
-          queue: [],
-          doorOpen: 0,
-        })
-        continue
-      }
-
-      const targetEntry = state.targetLevelId
-        ? entries.find((entry) => entry.id === state.targetLevelId)
-        : state.queue[0]
-          ? entries.find((entry) => entry.id === state.queue[0])
-          : null
-
-      const doorDurationMs = Math.max(elevator.doorDurationMs ?? 900, 1)
-      const doorStep = (delta * 1000) / doorDurationMs
-
-      switch (state.phase) {
-        case 'idle': {
-          const nextLevelId = state.queue[0] ?? null
-          if (!nextLevelId) {
-            if (state.doorOpen > EPSILON) {
-              interactive.setElevatorState(typedElevatorId, {
-                doorOpen: Math.max(0, state.doorOpen - doorStep),
-              })
-            }
-            break
-          }
-
-          interactive.setElevatorState(typedElevatorId, {
-            targetLevelId: nextLevelId,
-            phase:
-              state.doorOpen > EPSILON
-                ? 'closing'
-                : nextLevelId === state.currentLevelId
-                  ? 'opening'
-                  : 'moving',
-            phaseStartedAt: now,
-          })
-          break
-        }
-
-        case 'closing': {
-          const doorOpen = Math.max(0, state.doorOpen - doorStep)
-          interactive.setElevatorState(typedElevatorId, {
-            doorOpen,
-            phase: doorOpen <= EPSILON ? (state.targetLevelId ? 'moving' : 'idle') : 'closing',
-            phaseStartedAt: doorOpen <= EPSILON ? now : state.phaseStartedAt,
-          })
-          break
-        }
-
-        case 'moving': {
-          if (!targetEntry) {
-            interactive.setElevatorState(typedElevatorId, {
-              targetLevelId: null,
-              phase: 'idle',
-              queue: [],
-            })
-            break
-          }
-
-          const speed = Math.max(elevator.speed ?? 2.2, 0.1)
-          const nextY = moveToward(state.carY, targetEntry.baseY, speed * delta)
-          const arrived = Math.abs(nextY - targetEntry.baseY) <= EPSILON
-          interactive.setElevatorState(typedElevatorId, {
-            carY: nextY,
-            currentLevelId: arrived ? (targetEntry.id as AnyNodeId) : state.currentLevelId,
-            phase: arrived ? 'opening' : 'moving',
-            phaseStartedAt: arrived ? now : state.phaseStartedAt,
-          })
-          break
-        }
-
-        case 'opening': {
-          const doorOpen = Math.min(1, state.doorOpen + doorStep)
-          interactive.setElevatorState(typedElevatorId, {
-            doorOpen,
-            phase: doorOpen >= 1 - EPSILON ? 'open' : 'opening',
-            phaseStartedAt: doorOpen >= 1 - EPSILON ? now : state.phaseStartedAt,
-            targetLevelId: doorOpen >= 1 - EPSILON ? null : state.targetLevelId,
-            queue:
-              doorOpen >= 1 - EPSILON && state.queue[0] === state.currentLevelId
-                ? state.queue.slice(1)
-                : state.queue,
-          })
-          break
-        }
-
-        case 'open': {
-          const elapsed = now - (state.phaseStartedAt ?? now)
-          if (elapsed < Math.max(elevator.dwellMs ?? 1400, 0)) break
-
-          interactive.setElevatorState(typedElevatorId, {
-            phase: 'closing',
-            phaseStartedAt: now,
-            targetLevelId: state.queue[0] ?? null,
-          })
-          break
-        }
-      }
-    }
-  }, 2)
-
-  return null
-}
diff --git a/packages/viewer/src/systems/elevator/elevator-interaction-system.tsx b/packages/viewer/src/systems/elevator/elevator-interaction-system.tsx
index 447259fb..ded3d499 100644
--- a/packages/viewer/src/systems/elevator/elevator-interaction-system.tsx
+++ b/packages/viewer/src/systems/elevator/elevator-interaction-system.tsx
@@ -1,6 +1,8 @@
 import {
   type AnyNodeId,
+  openElevatorDoor,
   resolveElevatorDispatchTarget,
+  requestElevatorLevel,
   useInteractive,
   useScene,
 } from '@pascal-app/core'
@@ -62,7 +64,7 @@ export function ElevatorInteractionSystem() {
       event.stopPropagation()
 
       if (button.action === 'open-door') {
-        useInteractive.getState().openElevatorDoor(button.elevatorId)
+        openElevatorDoor(button.elevatorId)
         return
       }
 
@@ -78,7 +80,7 @@ export function ElevatorInteractionSystem() {
             })
           : button.elevatorId
 
-      useInteractive.getState().requestElevator(targetElevatorId, button.levelId)
+      requestElevatorLevel(targetElevatorId, button.levelId)
     }
 
     canvas.addEventListener('pointerdown', handlePointerDown, true)
diff --git a/packages/viewer/src/systems/elevator/elevator-utils.ts b/packages/viewer/src/systems/elevator/elevator-utils.ts
deleted file mode 100644
index 4c0c03fa..00000000
--- a/packages/viewer/src/systems/elevator/elevator-utils.ts
+++ /dev/null
@@ -1,68 +0,0 @@
-import {
-  resolveElevatorBuildingLevels,
-  resolveElevatorServiceLevels,
-  type AnyNode,
-  type AnyNodeId,
-  type ElevatorNode,
-  type LevelNode,
-} from '@pascal-app/core'
-import { getLevelHeight } from '../level/level-utils'
-
-export type ElevatorLevelEntry = {
-  id: LevelNode['id']
-  label: string
-  baseY: number
-}
-
-export function resolveElevatorLevels(
-  elevator: ElevatorNode,
-  nodes: Record<AnyNodeId, AnyNode>,
-): {
-  entries: ElevatorLevelEntry[]
-  defaultEntry: ElevatorLevelEntry | null
-  shaftBaseY: number
-  shaftTopY: number
-  totalHeight: number
-} {
-  const allLevels = resolveElevatorBuildingLevels(elevator, nodes)
-
-  const baseYByLevelId = new Map<string, number>()
-  let cumulativeY = 0
-  for (const level of allLevels) {
-    baseYByLevelId.set(level.id, cumulativeY)
-    cumulativeY += getLevelHeight(level.id, nodes)
-  }
-
-  const serviceLevels = resolveElevatorServiceLevels(elevator, nodes)
-  const entries = serviceLevels.map((level) => ({
-    id: level.id,
-    label: String(level.level),
-    baseY: baseYByLevelId.get(level.id) ?? 0,
-  }))
-
-  const defaultEntry =
-    entries.find((entry) => entry.id === elevator.defaultLevelId) ??
-    entries.find((entry) => entry.id === elevator.fromLevelId) ??
-    entries[0] ??
-    null
-  const firstServedLevel = serviceLevels[0] ?? null
-  const lastServedLevel = serviceLevels[serviceLevels.length - 1] ?? null
-  const shaftBaseY = firstServedLevel ? (baseYByLevelId.get(firstServedLevel.id) ?? 0) : 0
-  const lastServedIndex = lastServedLevel
-    ? allLevels.findIndex((level) => level.id === lastServedLevel.id)
-    : -1
-  const nextLevel = lastServedIndex >= 0 ? allLevels[lastServedIndex + 1] : null
-  const shaftTopY = nextLevel
-    ? (baseYByLevelId.get(nextLevel.id) ?? cumulativeY)
-    : lastServedLevel
-      ? cumulativeY
-      : elevator.cabHeight + 0.3
-
-  return {
-    entries,
-    defaultEntry,
-    shaftBaseY,
-    shaftTopY,
-    totalHeight: Math.max(shaftTopY - shaftBaseY, elevator.cabHeight + 0.3),
-  }
-}