diff --git a/components/animate/AnimationPreview.tsx b/components/animate/AnimationPreview.tsx
index 55ddbb5..3df2024 100644
--- a/components/animate/AnimationPreview.tsx
+++ b/components/animate/AnimationPreview.tsx
@@ -2,7 +2,7 @@
 
 import { useEffect, useRef, useState } from 'react';
 import { Play, Pause, RotateCcw, Square, Circle, Type } from 'lucide-react';
-import { cn } from '@/lib/utils/cn';
+import { cn, iconBtn } from '@/lib/utils';
 import { buildCSS } from '@/lib/animate/cssBuilder';
 import type { AnimationConfig, PreviewElement } from '@/types/animate';
 
@@ -27,7 +27,7 @@ const ELEMENTS: { value: PreviewElement; icon: React.ReactNode; title: string }[
   { value: 'text', icon: <Type className="w-3 h-3" />, title: 'Text' },
 ];
 
-const actionBtn = 'flex items-center justify-center w-7 h-7 glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
+const previewBtn = cn(iconBtn, 'w-7 h-7');
 
 const pillCls = (active: boolean) =>
   cn(
@@ -138,7 +138,7 @@ export function AnimationPreview({ config, element, onElementChange }: Props) {
             onClick={() => animState === 'ended' ? restart() : setAnimState('playing')}
             disabled={animState === 'playing'}
             title={animState === 'ended' ? 'Replay' : 'Play'}
-            className={actionBtn}
+            className={previewBtn}
           >
             <Play className="w-3 h-3" />
           </button>
@@ -146,11 +146,11 @@ export function AnimationPreview({ config, element, onElementChange }: Props) {
             onClick={() => setAnimState('paused')}
             disabled={animState !== 'playing'}
             title="Pause"
-            className={actionBtn}
+            className={previewBtn}
           >
             <Pause className="w-3 h-3" />
           </button>
-          <button onClick={restart} title="Restart" className={actionBtn}>
+          <button onClick={restart} title="Restart" className={previewBtn}>
             <RotateCcw className="w-3 h-3" />
           </button>
         </div>
diff --git a/components/animate/KeyframeTimeline.tsx b/components/animate/KeyframeTimeline.tsx
index cfe0580..68bf769 100644
--- a/components/animate/KeyframeTimeline.tsx
+++ b/components/animate/KeyframeTimeline.tsx
@@ -2,7 +2,7 @@
 
 import { useRef } from 'react';
 import { Plus, Trash2 } from 'lucide-react';
-import { cn } from '@/lib/utils/cn';
+import { cn, iconBtn } from '@/lib/utils';
 import type { Keyframe } from '@/types/animate';
 
 interface Props {
@@ -17,11 +17,7 @@ interface Props {
 
 const TICKS = [25, 50, 75];
 
-const iconBtn = (disabled?: boolean) =>
-  cn(
-    'w-6 h-6 flex items-center justify-center rounded-md glass border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 transition-all',
-    disabled && 'opacity-30 cursor-not-allowed pointer-events-none'
-  );
+const timelineBtn = cn(iconBtn, 'w-6 h-6');
 
 export function KeyframeTimeline({ keyframes, selectedId, onSelect, onAdd, onDelete, onMove, embedded = false }: Props) {
   const trackRef = useRef<HTMLDivElement>(null);
@@ -68,14 +64,14 @@ export function KeyframeTimeline({ keyframes, selectedId, onSelect, onAdd, onDel
           </span>
         </div>
         <div className="flex items-center gap-1">
-          <button onClick={() => onAdd(50)} title="Add at 50%" className={iconBtn()}>
+          <button onClick={() => onAdd(50)} title="Add at 50%" className={timelineBtn}>
             <Plus className="w-3 h-3" />
           </button>
           <button
             onClick={() => selectedId && onDelete(selectedId)}
             disabled={!selectedId || keyframes.length <= 2}
             title="Delete selected"
-            className={iconBtn(!selectedId || keyframes.length <= 2)}
+            className={timelineBtn}
           >
             <Trash2 className="w-3 h-3" />
           </button>
diff --git a/components/ascii/FontPreview.tsx b/components/ascii/FontPreview.tsx
index 158b47b..584b405 100644
--- a/components/ascii/FontPreview.tsx
+++ b/components/ascii/FontPreview.tsx
@@ -13,7 +13,7 @@ import {
   MessageSquareCode,
   Type,
 } from 'lucide-react';
-import { cn } from '@/lib/utils/cn';
+import { cn, actionBtn } from '@/lib/utils';
 import { toast } from 'sonner';
 
 export type CommentStyle = 'none' | '//' | '#' | '--' | ';' | '/* */' | '<!-- -->' | '"""';
@@ -116,9 +116,6 @@ export function FontPreview({
     }
   };
 
-  const actionBtn =
-    'flex items-center gap-1 px-2.5 py-1 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all';
-
   return (
     <div className={cn('glass rounded-xl p-4 flex flex-col gap-3 flex-1 min-h-0 overflow-hidden', className)}>
 
diff --git a/components/color/ColorManipulation.tsx b/components/color/ColorManipulation.tsx
index cb54d38..b4d5075 100644
--- a/components/color/ColorManipulation.tsx
+++ b/components/color/ColorManipulation.tsx
@@ -10,7 +10,7 @@ import { ExportMenu } from '@/components/color/ExportMenu';
 import { useColorInfo, useGeneratePalette, useGenerateGradient } from '@/lib/color/api/queries';
 import { Loader2, Share2, Plus, X, Palette, Layers } from 'lucide-react';
 import { toast } from 'sonner';
-import { cn } from '@/lib/utils';
+import { cn, actionBtn } from '@/lib/utils';
 import { MobileTabs } from '@/components/ui/mobile-tabs';
 
 type HarmonyType = 'monochromatic' | 'analogous' | 'complementary' | 'triadic' | 'tetradic';
@@ -32,8 +32,6 @@ const RIGHT_TABS: { value: RightTab; label: string }[] = [
   { value: 'gradient', label: 'Gradient' },
 ];
 
-const actionBtn =
-  'flex items-center gap-1 px-2.5 py-1 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
 
 function ColorManipulationContent() {
   const searchParams = useSearchParams();
diff --git a/components/color/ExportMenu.tsx b/components/color/ExportMenu.tsx
index 9522452..a424b1f 100644
--- a/components/color/ExportMenu.tsx
+++ b/components/color/ExportMenu.tsx
@@ -14,7 +14,7 @@ import {
 } from '@/lib/color/utils/export';
 import { colorAPI } from '@/lib/color/api/client';
 import { CodeSnippet } from '@/components/ui/code-snippet';
-import { cn } from '@/lib/utils/cn';
+import { cn, actionBtn } from '@/lib/utils';
 
 interface ExportMenuProps {
   colors: string[];
@@ -27,8 +27,6 @@ type ColorSpace = 'hex' | 'rgb' | 'hsl' | 'lab' | 'oklab' | 'lch' | 'oklch';
 const selectCls =
   'flex-1 bg-transparent border border-border/40 rounded-lg px-2.5 py-1.5 text-xs font-mono outline-none focus:border-primary/50 transition-colors text-foreground/80 cursor-pointer';
 
-const actionBtn =
-  'flex items-center gap-1.5 px-3 py-1.5 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
 
 export function ExportMenu({ colors, className }: ExportMenuProps) {
   const [format, setFormat] = useState<ExportFormat>('css');
diff --git a/components/color/ManipulationPanel.tsx b/components/color/ManipulationPanel.tsx
index a8f531a..f79aeb2 100644
--- a/components/color/ManipulationPanel.tsx
+++ b/components/color/ManipulationPanel.tsx
@@ -12,15 +12,13 @@ import {
 } from '@/lib/color/api/queries';
 import { toast } from 'sonner';
 import { Sun, Moon, Droplets, Droplet, RotateCcw, ArrowLeftRight } from 'lucide-react';
-import { cn } from '@/lib/utils/cn';
+import { cn, actionBtn } from '@/lib/utils';
 
 interface ManipulationPanelProps {
   color: string;
   onColorChange: (color: string) => void;
 }
 
-const actionBtn =
-  'shrink-0 px-3 py-1 text-[10px] font-mono glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
 
 export function ManipulationPanel({ color, onColorChange }: ManipulationPanelProps) {
   const [lightenAmount, setLightenAmount] = useState(0.2);
@@ -118,7 +116,7 @@ export function ManipulationPanel({ color, onColorChange }: ManipulationPanelPro
               onValueChange={(vals) => row.setValue(vals[0])}
               className="flex-1"
             />
-            <button onClick={row.onApply} disabled={isLoading} className={actionBtn}>
+            <button onClick={row.onApply} disabled={isLoading} className={cn(actionBtn, 'shrink-0')}>
               Apply
             </button>
           </div>
@@ -137,7 +135,7 @@ export function ManipulationPanel({ color, onColorChange }: ManipulationPanelPro
             } catch { toast.error('Failed'); }
           }}
           disabled={isLoading}
-          className={cn(actionBtn, 'w-full justify-center flex items-center gap-1.5 py-2')}
+          className={cn(actionBtn, 'w-full justify-center py-2')}
         >
           <ArrowLeftRight className="w-3 h-3" />
           Complementary Color
diff --git a/components/favicon/FaviconGenerator.tsx b/components/favicon/FaviconGenerator.tsx
index 97271a9..9383043 100644
--- a/components/favicon/FaviconGenerator.tsx
+++ b/components/favicon/FaviconGenerator.tsx
@@ -9,7 +9,7 @@ import { generateFaviconSet } from '@/lib/favicon/faviconService';
 import { downloadBlobsAsZip } from '@/lib/media/utils/fileUtils';
 import type { FaviconSet, FaviconOptions } from '@/types/favicon';
 import { toast } from 'sonner';
-import { cn } from '@/lib/utils/cn';
+import { cn, actionBtn } from '@/lib/utils';
 import { MobileTabs } from '@/components/ui/mobile-tabs';
 
 type Tab = 'icons' | 'html' | 'manifest';
@@ -21,8 +21,6 @@ const TABS: { value: Tab; label: string; icon: React.ReactNode }[] = [
   { value: 'manifest', label: 'Manifest', icon: <Globe className="w-3 h-3" /> },
 ];
 
-const actionBtn =
-  'flex items-center justify-center gap-1.5 px-3 py-1.5 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
 
 const inputCls =
   'w-full bg-transparent border border-border/40 rounded-lg px-3 py-2 text-xs font-mono outline-none focus:border-primary/50 transition-colors text-foreground/80 placeholder:text-muted-foreground/30';
@@ -160,7 +158,7 @@ export function FaviconGenerator() {
               <button
                 onClick={handleGenerate}
                 disabled={!sourceFile || isGenerating}
-                className={cn(actionBtn, 'flex-1 py-2.5')}
+                className={cn(actionBtn, 'flex-1 justify-center')}
               >
                 {isGenerating
                   ? <><Loader2 className="w-3 h-3 animate-spin" /> Generating… {progress}%</>
diff --git a/components/media/ConversionPreview.tsx b/components/media/ConversionPreview.tsx
index 2a259e1..5f61d3f 100644
--- a/components/media/ConversionPreview.tsx
+++ b/components/media/ConversionPreview.tsx
@@ -2,7 +2,7 @@
 
 import * as React from 'react';
 import { Download, CheckCircle, XCircle, Loader2, Clock, TrendingUp, RefreshCw } from 'lucide-react';
-import { cn } from '@/lib/utils/cn';
+import { cn, actionBtn } from '@/lib/utils';
 import { downloadBlob, formatFileSize, generateOutputFilename } from '@/lib/media/utils/fileUtils';
 import type { ConversionJob } from '@/types/media';
 
@@ -11,9 +11,6 @@ export interface ConversionPreviewProps {
   onRetry?: () => void;
 }
 
-const actionBtn =
-  'flex items-center justify-center gap-1.5 px-3 py-1.5 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
-
 export function ConversionPreview({ job, onRetry }: ConversionPreviewProps) {
   const [previewUrl, setPreviewUrl] = React.useState<string | null>(null);
   const [elapsedTime, setElapsedTime] = React.useState(0);
@@ -171,7 +168,7 @@ export function ConversionPreview({ job, onRetry }: ConversionPreviewProps) {
           })()}
 
           {/* Download */}
-          <button onClick={handleDownload} className={cn(actionBtn, 'w-full')}>
+          <button onClick={handleDownload} className={cn(actionBtn, 'w-full justify-center')}>
             <Download className="w-3 h-3" />
             <span className="truncate min-w-0">{filename}</span>
           </button>
@@ -187,7 +184,7 @@ export function ConversionPreview({ job, onRetry }: ConversionPreviewProps) {
             </div>
           )}
           {onRetry && (
-            <button onClick={onRetry} className={cn(actionBtn, 'w-full')}>
+            <button onClick={onRetry} className={cn(actionBtn, 'w-full justify-center')}>
               <RefreshCw className="w-3 h-3" />
               Retry
             </button>
diff --git a/components/media/FileConverter.tsx b/components/media/FileConverter.tsx
index b7bc9e3..8db9d40 100644
--- a/components/media/FileConverter.tsx
+++ b/components/media/FileConverter.tsx
@@ -17,13 +17,10 @@ import { addToHistory } from '@/lib/media/storage/history';
 import { downloadBlobsAsZip, generateOutputFilename } from '@/lib/media/utils/fileUtils';
 import type { ConversionJob, ConversionFormat, ConversionOptions } from '@/types/media';
 import { ShieldCheck, Download, RotateCcw, Loader2 } from 'lucide-react';
-import { cn } from '@/lib/utils';
+import { cn, actionBtn } from '@/lib/utils';
 
 type MobileTab = 'upload' | 'convert';
 
-const actionBtn =
-  'flex items-center justify-center gap-1.5 px-3 py-1.5 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
-
 const selectCls =
   'w-full bg-transparent border border-border/40 rounded-lg px-2.5 py-1.5 text-xs font-mono outline-none focus:border-primary/50 transition-colors text-foreground/80 cursor-pointer disabled:opacity-40';
 
@@ -439,7 +436,7 @@ export function FileConverter() {
                     <button
                       onClick={handleConvert}
                       disabled={!selectedFiles.length || !outputFormat || isConverting}
-                      className={cn(actionBtn, 'flex-1 py-2')}
+                      className={cn(actionBtn, 'flex-1 justify-center py-2')}
                     >
                       {isConverting
                         ? <><Loader2 className="w-3 h-3 animate-spin" />Converting…</>
diff --git a/components/qrcode/QRPreview.tsx b/components/qrcode/QRPreview.tsx
index c102fc9..23bc0b0 100644
--- a/components/qrcode/QRPreview.tsx
+++ b/components/qrcode/QRPreview.tsx
@@ -1,7 +1,7 @@
 'use client';
 
 import { Copy, Share2, Image as ImageIcon, FileCode, QrCode } from 'lucide-react';
-import { cn } from '@/lib/utils/cn';
+import { cn, actionBtn } from '@/lib/utils';
 import type { ExportSize } from '@/types/qrcode';
 
 interface QRPreviewProps {
@@ -22,8 +22,6 @@ const EXPORT_SIZES: { value: ExportSize; label: string }[] = [
   { value: 2048, label: '2k' },
 ];
 
-const actionBtn =
-  'flex items-center gap-1 px-2.5 py-1 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
 
 export function QRPreview({
   svgString,
diff --git a/components/random/RandomGenerator.tsx b/components/random/RandomGenerator.tsx
index 1fda63f..2a66a75 100644
--- a/components/random/RandomGenerator.tsx
+++ b/components/random/RandomGenerator.tsx
@@ -3,7 +3,7 @@
 import { useState, useCallback } from 'react';
 import { RefreshCw, Copy, Check, Clock } from 'lucide-react';
 import { toast } from 'sonner';
-import { cn } from '@/lib/utils/cn';
+import { cn, actionBtn } from '@/lib/utils';
 import { SliderRow } from '@/components/ui/slider-row';
 import { MobileTabs } from '@/components/ui/mobile-tabs';
 import {
@@ -392,7 +392,7 @@ export function RandomGenerator() {
               <button
                 onClick={() => copy()}
                 disabled={!output}
-                className="flex items-center gap-1.5 px-3 py-2 rounded-lg glass border border-border/30 text-xs font-mono text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-30"
+                className={actionBtn}
               >
                 {copied ? <Check className="w-3.5 h-3.5" /> : <Copy className="w-3.5 h-3.5" />}
                 {copied ? 'Copied' : 'Copy'}
diff --git a/lib/utils/index.ts b/lib/utils/index.ts
index 3eae037..57b03f0 100644
--- a/lib/utils/index.ts
+++ b/lib/utils/index.ts
@@ -4,3 +4,4 @@ export * from './urlSharing';
 export * from './animations';
 export * from './format';
 export * from './time';
+export * from './styles';
diff --git a/lib/utils/styles.ts b/lib/utils/styles.ts
new file mode 100644
index 0000000..8d902d4
--- /dev/null
+++ b/lib/utils/styles.ts
@@ -0,0 +1,11 @@
+/**
+ * Shared Tailwind class strings for consistent UI patterns across tools.
+ */
+
+/** Standard action button used throughout all tools (copy, download, share, apply…) */
+export const actionBtn =
+  'flex items-center gap-1.5 px-3 py-1.5 text-xs font-mono glass rounded-lg border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';
+
+/** Small square icon-only button (animate preview controls, timeline actions) */
+export const iconBtn =
+  'flex items-center justify-center glass rounded-lg border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all disabled:opacity-40 disabled:cursor-not-allowed';