diff --git a/packages/core/src/editor/clipboard.ts b/packages/core/src/editor/clipboard.ts
index a6245941b..ce638f25c 100644
--- a/packages/core/src/editor/clipboard.ts
+++ b/packages/core/src/editor/clipboard.ts
@@ -1,3 +1,4 @@
+import { computeBounds } from '../geometry'
 import { computeAllLayouts } from '../layout'
 import {
   buildFigmaClipboardHTML,
@@ -25,21 +26,11 @@ export function createClipboardActions(ctx: EditorContext) {
   }
 
   function centerNodesAt(nodeIds: string[], cx: number, cy: number) {
-    let minX = Infinity
-    let minY = Infinity
-    let maxX = -Infinity
-    let maxY = -Infinity
-    for (const id of nodeIds) {
-      const n = ctx.graph.getNode(id)
-      if (!n) continue
-      minX = Math.min(minX, n.x)
-      minY = Math.min(minY, n.y)
-      maxX = Math.max(maxX, n.x + n.width)
-      maxY = Math.max(maxY, n.y + n.height)
-    }
-    if (minX === Infinity) return
-    const dx = cx - (minX + maxX) / 2
-    const dy = cy - (minY + maxY) / 2
+    const items = nodeIds.map((id) => ctx.graph.getNode(id)).filter((n) => n != null)
+    const b = computeBounds(items)
+    if (b.width === 0 && b.height === 0 && items.length === 0) return
+    const dx = cx - (b.x + b.width / 2)
+    const dy = cy - (b.y + b.height / 2)
     for (const id of nodeIds) {
       const n = ctx.graph.getNode(id)
       if (n) ctx.graph.updateNode(id, { x: n.x + dx, y: n.y + dy })
diff --git a/packages/core/src/editor/viewport.ts b/packages/core/src/editor/viewport.ts
index cda054257..2da475a1a 100644
--- a/packages/core/src/editor/viewport.ts
+++ b/packages/core/src/editor/viewport.ts
@@ -1,4 +1,5 @@
 import { ZOOM_DIVISOR, ZOOM_SCALE_MAX, ZOOM_SCALE_MIN } from '../constants'
+import { computeBounds } from '../geometry'
 
 import type { EditorContext } from './types'
 
@@ -46,18 +47,8 @@ export function createViewportActions(ctx: EditorContext) {
     const nodes = ctx.graph.getChildren(ctx.state.currentPageId)
     if (nodes.length === 0) return
 
-    let minX = Infinity
-    let minY = Infinity
-    let maxX = -Infinity
-    let maxY = -Infinity
-    for (const n of nodes) {
-      minX = Math.min(minX, n.x)
-      minY = Math.min(minY, n.y)
-      maxX = Math.max(maxX, n.x + n.width)
-      maxY = Math.max(maxY, n.y + n.height)
-    }
-
-    zoomToBounds(minX, minY, maxX, maxY)
+    const b = computeBounds(nodes)
+    zoomToBounds(b.x, b.y, b.x + b.width, b.y + b.height)
   }
 
   function zoomTo100() {
diff --git a/packages/core/src/fig-compress.ts b/packages/core/src/fig-compress.ts
new file mode 100644
index 000000000..864306a16
--- /dev/null
+++ b/packages/core/src/fig-compress.ts
@@ -0,0 +1,22 @@
+import { zipSync, type Zippable } from 'fflate'
+
+import { buildFigKiwi } from './kiwi/kiwi-serialize'
+
+export function compressFigDataSync(
+  schemaDeflated: Uint8Array,
+  kiwiData: Uint8Array,
+  thumbnailPng: Uint8Array,
+  metaJson: string,
+  imageEntries: Array<{ name: string; data: Uint8Array }>
+): Uint8Array {
+  const canvasData = buildFigKiwi(schemaDeflated, kiwiData)
+  const zipEntries: Zippable = {
+    'canvas.fig': [canvasData, { level: 0 }],
+    'thumbnail.png': [thumbnailPng, { level: 0 }],
+    'meta.json': new TextEncoder().encode(metaJson)
+  }
+  for (const entry of imageEntries) {
+    zipEntries[entry.name] = [entry.data, { level: 0 }]
+  }
+  return zipSync(zipEntries)
+}
diff --git a/packages/core/src/fig-export-worker.ts b/packages/core/src/fig-export-worker.ts
index 657e0229d..e3eb000a1 100644
--- a/packages/core/src/fig-export-worker.ts
+++ b/packages/core/src/fig-export-worker.ts
@@ -1,5 +1,4 @@
-import { zipSync, type Zippable } from 'fflate'
-import { buildFigKiwi } from './kiwi/kiwi-serialize'
+import { compressFigDataSync } from './fig-compress'
 
 interface CompressMessage {
   schemaDeflated: Uint8Array
@@ -11,18 +10,6 @@ interface CompressMessage {
 
 self.onmessage = (e: MessageEvent<CompressMessage>) => {
   const { schemaDeflated, kiwiData, thumbnailPng, metaJson, images } = e.data
-
-  const canvasData = buildFigKiwi(schemaDeflated, kiwiData)
-
-  const zipEntries: Zippable = {
-    'canvas.fig': [canvasData, { level: 0 }],
-    'thumbnail.png': [thumbnailPng, { level: 0 }],
-    'meta.json': new TextEncoder().encode(metaJson)
-  }
-  for (const entry of images) {
-    zipEntries[entry.name] = [entry.data, { level: 0 }]
-  }
-
-  const result = zipSync(zipEntries)
+  const result = compressFigDataSync(schemaDeflated, kiwiData, thumbnailPng, metaJson, images)
   self.postMessage(result, { transfer: [result.buffer] })
 }
diff --git a/packages/core/src/fig-export.ts b/packages/core/src/fig-export.ts
index 5be63b56a..3a87b8217 100644
--- a/packages/core/src/fig-export.ts
+++ b/packages/core/src/fig-export.ts
@@ -1,16 +1,22 @@
-import { zipSync, deflateSync, type Zippable } from 'fflate'
+import { deflateSync } from 'fflate'
 
 import { CANVAS_BG_COLOR, IS_BROWSER, IS_TAURI } from './constants'
-import { sceneNodeToKiwi, fractionalPosition, buildFigKiwi, buildFontDigestMap, safeColor } from './kiwi/kiwi-serialize'
+import { compressFigDataSync } from './fig-compress'
 import { initCodec, getCompiledSchema, getSchemaBytes } from './kiwi/codec'
 import { stringToGuid } from './kiwi/kiwi-convert'
+import {
+  sceneNodeToKiwi,
+  fractionalPosition,
+  buildFontDigestMap,
+  safeColor
+} from './kiwi/kiwi-serialize'
 import { renderThumbnail } from './render-image'
 
 import type { NodeChange } from './kiwi/codec'
 import type { SkiaRenderer } from './renderer'
 import type { SceneGraph, VariableValue } from './scene-graph'
-import type { CanvasKit } from 'canvaskit-wasm'
 import type { GUID } from './types'
+import type { CanvasKit } from 'canvaskit-wasm'
 
 const THUMBNAIL_1X1 = Uint8Array.from(
   atob(
@@ -128,7 +134,17 @@ export async function exportFigFile(
     const children = graph.getChildren(page.id)
     for (let i = 0; i < children.length; i++) {
       nodeChanges.push(
-        ...sceneNodeToKiwi(children[i], canvasGuid, i, localIdCounter, graph, blobs, nodeIdToGuid, fontDigestMap, varIdToGuid)
+        ...sceneNodeToKiwi(
+          children[i],
+          canvasGuid,
+          i,
+          localIdCounter,
+          graph,
+          blobs,
+          nodeIdToGuid,
+          fontDigestMap,
+          varIdToGuid
+        )
       )
     }
   }
@@ -182,7 +198,11 @@ export async function exportFigFile(
 
         const varGuid = { sessionID: 0, localID: localIdCounter.value++ }
         varIdToGuid.set(varId, varGuid)
-        const typeMap: Record<string, string> = { COLOR: 'COLOR', BOOLEAN: 'BOOLEAN', STRING: 'STRING' }
+        const typeMap: Record<string, string> = {
+          COLOR: 'COLOR',
+          BOOLEAN: 'BOOLEAN',
+          STRING: 'STRING'
+        }
         const resolvedType = typeMap[variable.type] ?? 'FLOAT'
 
         const entries = Object.entries(variable.valuesByMode).map(([modeId, value]) => ({
@@ -243,7 +263,7 @@ export async function exportFigFile(
         kiwiData: Array.from(kiwiData),
         thumbnailPng: Array.from(thumbnailPng),
         metaJson,
-        images: imageEntries.map(e => ({ name: e.name, data: Array.from(e.data) }))
+        images: imageEntries.map((e) => ({ name: e.name, data: Array.from(e.data) }))
       })
     )
   }
@@ -251,24 +271,7 @@ export async function exportFigFile(
   return compressFigData(schemaDeflated, kiwiData, thumbnailPng, metaJson, imageEntries)
 }
 
-export function compressFigDataSync(
-  schemaDeflated: Uint8Array,
-  kiwiData: Uint8Array,
-  thumbnailPng: Uint8Array,
-  metaJson: string,
-  imageEntries: Array<{ name: string; data: Uint8Array }>
-): Uint8Array {
-  const canvasData = buildFigKiwi(schemaDeflated, kiwiData)
-  const zipEntries: Zippable = {
-    'canvas.fig': [canvasData, { level: 0 }],
-    'thumbnail.png': [thumbnailPng, { level: 0 }],
-    'meta.json': new TextEncoder().encode(metaJson)
-  }
-  for (const entry of imageEntries) {
-    zipEntries[entry.name] = [entry.data, { level: 0 }]
-  }
-  return zipSync(zipEntries)
-}
+export { compressFigDataSync } from './fig-compress'
 
 function canUseWorker(): boolean {
   return typeof Worker !== 'undefined' && IS_BROWSER
@@ -282,7 +285,9 @@ function compressViaWorker(
   imageEntries: Array<{ name: string; data: Uint8Array }>
 ): Promise<Uint8Array> {
   return new Promise((resolve, reject) => {
-    const worker = new Worker(new URL('./fig-export-worker.ts', import.meta.url), { type: 'module' })
+    const worker = new Worker(new URL('./fig-export-worker.ts', import.meta.url), {
+      type: 'module'
+    })
 
     worker.onmessage = (e: MessageEvent<Uint8Array>) => {
       resolve(e.data)
@@ -322,5 +327,7 @@ export function compressFigData(
   if (canUseWorker()) {
     return compressViaWorker(schemaDeflated, kiwiData, thumbnailPng, metaJson, imageEntries)
   }
-  return Promise.resolve(compressFigDataSync(schemaDeflated, kiwiData, thumbnailPng, metaJson, imageEntries))
+  return Promise.resolve(
+    compressFigDataSync(schemaDeflated, kiwiData, thumbnailPng, metaJson, imageEntries)
+  )
 }
diff --git a/packages/core/src/figma-api.ts b/packages/core/src/figma-api.ts
index 00d34d366..8dc31fe22 100644
--- a/packages/core/src/figma-api.ts
+++ b/packages/core/src/figma-api.ts
@@ -8,6 +8,7 @@ import type {
 } from './scene-graph'
 import type { Rect, Vector } from './types'
 import { IS_BROWSER } from './constants'
+import { computeBounds } from './geometry'
 import { copyFills, copyStrokes, copyEffects } from './copy'
 
 import {
@@ -322,26 +323,16 @@ export class FigmaAPI implements NodeProxyHost {
       center: { x: this._viewport.x, y: this._viewport.y },
       zoom: this._viewport.zoom,
       scrollAndZoomIntoView: (nodes) => {
-        let minX = Infinity
-        let minY = Infinity
-        let maxX = -Infinity
-        let maxY = -Infinity
-        for (const node of nodes) {
-          const b = node.absoluteBoundingBox
-          minX = Math.min(minX, b.x)
-          minY = Math.min(minY, b.y)
-          maxX = Math.max(maxX, b.x + b.width)
-          maxY = Math.max(maxY, b.y + b.height)
-        }
-        if (minX === Infinity) return
+        const b = computeBounds(nodes.map((n) => n.absoluteBoundingBox))
+        if (b.width === 0 && b.height === 0 && nodes.length === 0) return
 
         const padding = 80
-        const contentW = maxX - minX + padding * 2
-        const contentH = maxY - minY + padding * 2
+        const contentW = b.width + padding * 2
+        const contentH = b.height + padding * 2
         const viewW = IS_BROWSER ? window.innerWidth : 1280
         const viewH = IS_BROWSER ? window.innerHeight : 720
         const zoom = Math.min(viewW / contentW, viewH / contentH, 1)
-        this._viewport = { x: (minX + maxX) / 2, y: (minY + maxY) / 2, zoom }
+        this._viewport = { x: b.x + b.width / 2, y: b.y + b.height / 2, zoom }
       }
     }
   }
diff --git a/packages/core/src/geometry.ts b/packages/core/src/geometry.ts
index 2e50be8d1..e5d2c4889 100644
--- a/packages/core/src/geometry.ts
+++ b/packages/core/src/geometry.ts
@@ -1,4 +1,4 @@
-import type { Vector } from './types'
+import type { Rect, Vector } from './types'
 
 export function degToRad(degrees: number): number {
   return (degrees * Math.PI) / 180
@@ -71,3 +71,15 @@ export function rotatedBBox(
   }
   return { left, right, top, bottom, centerX: (left + right) / 2, centerY: (top + bottom) / 2 }
 }
+
+export function computeBounds(items: Iterable<Rect>): Rect {
+  let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity
+  for (const item of items) {
+    minX = Math.min(minX, item.x)
+    minY = Math.min(minY, item.y)
+    maxX = Math.max(maxX, item.x + item.width)
+    maxY = Math.max(maxY, item.y + item.height)
+  }
+  if (minX === Infinity) return { x: 0, y: 0, width: 0, height: 0 }
+  return { x: minX, y: minY, width: maxX - minX, height: maxY - minY }
+}
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 8d7867ec4..688f854af 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -1,5 +1,5 @@
 export type { GUID, Color, Vector, Matrix, Rect } from './types'
-export { degToRad, radToDeg, rotatePoint, rotatedCorners, rotatedBBox } from './geometry'
+export { computeBounds, degToRad, radToDeg, rotatePoint, rotatedCorners, rotatedBBox } from './geometry'
 export { randomHex, randomInt, randomIndex } from './random'
 
 export * from './constants'
@@ -67,7 +67,7 @@ export {
 } from './scene-graph'
 
 export { FigmaAPI, FigmaNodeProxy, computeImageHash, type FigmaFontName } from './figma-api'
-export { ALL_TOOLS, CORE_TOOLS, EXTENDED_TOOLS, defineTool, toolsToAI, buildDebugLog } from './tools'
+export { ALL_TOOLS, CORE_TOOLS, EXTENDED_TOOLS, defineTool, toolsToAI, buildDebugLog, requireNode, NodeNotFoundError } from './tools'
 export type { ToolDef, ParamDef, ParamType, ToolLogEntry, ToolDebugLog, AIAdapterOptions, StepBudget } from './tools'
 export { executeRpcCommand, ALL_RPC_COMMANDS } from './rpc'
 export { queryByXPath, matchByXPath } from './xpath'
diff --git a/packages/core/src/snap.ts b/packages/core/src/snap.ts
index b5d53036d..88e5d0f8e 100644
--- a/packages/core/src/snap.ts
+++ b/packages/core/src/snap.ts
@@ -1,3 +1,4 @@
+import { rotatedBBox } from './geometry'
 import type { SceneNode } from './scene-graph'
 import type { Rect } from './types'
 
@@ -17,51 +18,7 @@ export interface SnapResult {
 }
 
 function getEdges(node: SceneNode) {
-  if (node.rotation === 0) {
-    return {
-      left: node.x,
-      right: node.x + node.width,
-      centerX: node.x + node.width / 2,
-      top: node.y,
-      bottom: node.y + node.height,
-      centerY: node.y + node.height / 2
-    }
-  }
-
-  const cx = node.x + node.width / 2
-  const cy = node.y + node.height / 2
-  const rad = (node.rotation * Math.PI) / 180
-  const cos = Math.cos(rad)
-  const sin = Math.sin(rad)
-  const hw = node.width / 2
-  const hh = node.height / 2
-
-  const corners = [
-    { x: cx + -hw * cos - -hh * sin, y: cy + -hw * sin + -hh * cos },
-    { x: cx + hw * cos - -hh * sin, y: cy + hw * sin + -hh * cos },
-    { x: cx + hw * cos - hh * sin, y: cy + hw * sin + hh * cos },
-    { x: cx + -hw * cos - hh * sin, y: cy + -hw * sin + hh * cos }
-  ]
-
-  let left = Infinity,
-    right = -Infinity,
-    top = Infinity,
-    bottom = -Infinity
-  for (const c of corners) {
-    left = Math.min(left, c.x)
-    right = Math.max(right, c.x)
-    top = Math.min(top, c.y)
-    bottom = Math.max(bottom, c.y)
-  }
-
-  return {
-    left,
-    right,
-    centerX: (left + right) / 2,
-    top,
-    bottom,
-    centerY: (top + bottom) / 2
-  }
+  return rotatedBBox(node.x, node.y, node.width, node.height, node.rotation)
 }
 
 export function computeSnap(
diff --git a/packages/core/src/tools/index.ts b/packages/core/src/tools/index.ts
index 33436bb79..d64560701 100644
--- a/packages/core/src/tools/index.ts
+++ b/packages/core/src/tools/index.ts
@@ -1,6 +1,6 @@
 export { ALL_TOOLS, CORE_TOOLS, EXTENDED_TOOLS } from './registry'
 export { exportImage } from './vector'
-export { defineTool, nodeToResult, nodeSummary } from './schema'
+export { defineTool, nodeToResult, nodeSummary, requireNode, NodeNotFoundError } from './schema'
 export type { ToolDef, ParamDef, ParamType } from './schema'
 export { toolsToAI, buildDebugLog } from './ai-adapter'
 export type { ToolLogEntry, ToolDebugLog, AIAdapterOptions, StepBudget } from './ai-adapter'
diff --git a/packages/core/src/tools/read.ts b/packages/core/src/tools/read.ts
index 137eac9bf..fa58c479d 100644
--- a/packages/core/src/tools/read.ts
+++ b/packages/core/src/tools/read.ts
@@ -1,5 +1,6 @@
 import { createTwoFilesPatch } from 'diff'
 
+import { computeBounds } from '../geometry'
 import { sceneNodeToJSX } from '../render/export-jsx'
 import { defineTool, nodeSummary, nodeToResult } from './schema'
 import { queryByXPath } from '../xpath'
@@ -165,20 +166,7 @@ export const pageBounds = defineTool({
   description: 'Get bounding box of all objects on the current page.',
   params: {},
   execute: (figma) => {
-    const page = figma.currentPage
-    let minX = Infinity
-    let minY = Infinity
-    let maxX = -Infinity
-    let maxY = -Infinity
-    for (const child of page.children) {
-      const bounds = child.absoluteBoundingBox
-      minX = Math.min(minX, bounds.x)
-      minY = Math.min(minY, bounds.y)
-      maxX = Math.max(maxX, bounds.x + bounds.width)
-      maxY = Math.max(maxY, bounds.y + bounds.height)
-    }
-    if (minX === Infinity) return { x: 0, y: 0, width: 0, height: 0 }
-    return { x: minX, y: minY, width: maxX - minX, height: maxY - minY }
+    return computeBounds(figma.currentPage.children.map((c) => c.absoluteBoundingBox))
   }
 })
 
diff --git a/packages/core/src/tools/schema.ts b/packages/core/src/tools/schema.ts
index 7280b6fe7..83933971c 100644
--- a/packages/core/src/tools/schema.ts
+++ b/packages/core/src/tools/schema.ts
@@ -56,6 +56,19 @@ export function defineTool<P extends Record<string, ParamDef>>(def: {
   return def as unknown as ToolDef
 }
 
+export class NodeNotFoundError extends Error {
+  constructor(id: string) {
+    super(`Node not found: ${id}`)
+    this.name = 'NodeNotFoundError'
+  }
+}
+
+export function requireNode(figma: FigmaAPI, id: string): ReturnType<FigmaAPI['getNodeById']> {
+  const node = figma.getNodeById(id)
+  if (!node) throw new NodeNotFoundError(id)
+  return node
+}
+
 export function nodeToResult(node: FigmaNodeProxy, maxDepth?: number): Record<string, unknown> {
   return node.toJSON(maxDepth)
 }
diff --git a/src/components/CodePanel.vue b/src/components/CodePanel.vue
index 8a669b0cb..48f91dcd6 100644
--- a/src/components/CodePanel.vue
+++ b/src/components/CodePanel.vue
@@ -101,7 +101,7 @@ watch(jsxCode, () => {
   </div>
 </template>
 
-<style>
+<style scoped>
 .token.tag {
   color: #7dd3fc;
 }