diff --git a/src/components/CopyableCode.tsx b/src/components/CopyableCode.tsx
new file mode 100644
index 0000000..a8d9d04
--- /dev/null
+++ b/src/components/CopyableCode.tsx
@@ -0,0 +1,45 @@
+import { useState } from 'react'
+
+interface Props {
+  code: string
+  prefix?: string
+}
+
+export default function CopyableCode({ code, prefix }: Props) {
+  const [copied, setCopied] = useState(false)
+
+  const handleCopy = async (e: React.MouseEvent) => {
+    e.stopPropagation()
+    try {
+      await navigator.clipboard.writeText(code)
+      setCopied(true)
+      setTimeout(() => setCopied(false), 1500)
+    } catch {
+      // fallback: select text
+    }
+  }
+
+  return (
+    <span
+      className="copyable-code"
+      title="Click to copy code"
+      onClick={handleCopy}
+      style={{
+        cursor: 'pointer',
+        fontFamily: 'monospace',
+        padding: '2px 8px',
+        borderRadius: '4px',
+        background: 'var(--bg-hover, rgba(255,255,255,.06))',
+        border: '1px solid var(--border, rgba(255,255,255,.1))',
+        fontSize: '0.95em',
+        userSelect: 'all',
+        transition: 'background .15s',
+      }}
+    >
+      {prefix}{code}
+      {copied && (
+        <span style={{ marginLeft: 6, fontSize: '0.8em', color: 'var(--success, #10b981)' }}>✓</span>
+      )}
+    </span>
+  )
+}
diff --git a/src/pages/MeetingDetailPage.tsx b/src/pages/MeetingDetailPage.tsx
index 08df180..5af76eb 100644
--- a/src/pages/MeetingDetailPage.tsx
+++ b/src/pages/MeetingDetailPage.tsx
@@ -3,6 +3,7 @@ import { useParams, useNavigate } from 'react-router-dom'
 import api from '@/services/api'
 import { useAuth } from '@/hooks/useAuth'
 import dayjs from 'dayjs'
+import CopyableCode from '@/components/CopyableCode'
 
 interface MeetingItem {
   id: number
@@ -153,7 +154,7 @@ export default function MeetingDetailPage() {
       <button className="btn-back" onClick={() => navigate(-1)}>← Back</button>
 
       <div className="task-header">
-        <h2>📅 {meeting.meeting_code || `#${meeting.id}`}</h2>
+        <h2>📅 {meeting.meeting_code ? <CopyableCode code={meeting.meeting_code} /> : `#${meeting.id}`}</h2>
         <div className="task-meta">
           <span className={`badge status-${meeting.status}`}>{meeting.status}</span>
           {meeting.project_code && <span className="text-dim">Project: {meeting.project_code}</span>}
diff --git a/src/pages/MilestoneDetailPage.tsx b/src/pages/MilestoneDetailPage.tsx
index a3bc37c..0f55b52 100644
--- a/src/pages/MilestoneDetailPage.tsx
+++ b/src/pages/MilestoneDetailPage.tsx
@@ -6,6 +6,7 @@ import dayjs from 'dayjs'
 import CreateTaskModal from '@/components/CreateTaskModal'
 import MilestoneFormModal from '@/components/MilestoneFormModal'
 import { useAuth } from '@/hooks/useAuth'
+import CopyableCode from '@/components/CopyableCode'
 
 interface MilestoneTask {
   id: number
@@ -155,7 +156,7 @@ export default function MilestoneDetailPage() {
       <button className="btn-back" onClick={() => navigate('/milestones')}>← Back to Milestones</button>
 
       <div className="task-header">
-        <h2>🏁 {milestone.title}</h2>
+        <h2>🏁 {milestone.milestone_code && <><CopyableCode code={milestone.milestone_code} /> </>}{milestone.title}</h2>
         <div className="task-meta">
           <span className={`badge status-${milestone.status}`}>{milestone.status}</span>
           {milestone.due_date && <span className="text-dim">Due {dayjs(milestone.due_date).format('YYYY-MM-DD')}</span>}
diff --git a/src/pages/ProjectDetailPage.tsx b/src/pages/ProjectDetailPage.tsx
index 6ba7028..af30090 100644
--- a/src/pages/ProjectDetailPage.tsx
+++ b/src/pages/ProjectDetailPage.tsx
@@ -6,6 +6,7 @@ import dayjs from 'dayjs'
 import { useAuth } from '@/hooks/useAuth'
 import ProjectFormModal from '@/components/ProjectFormModal'
 import MilestoneFormModal from '@/components/MilestoneFormModal'
+import CopyableCode from '@/components/CopyableCode'
 
 export default function ProjectDetailPage() {
   const { id } = useParams()
@@ -74,7 +75,7 @@ export default function ProjectDetailPage() {
       <button className="btn-back" onClick={() => navigate('/projects')}>← Back to projects</button>
 
       <div className="task-header">
-        <h2>📁 {project.name} {project.project_code && <span className="badge">{project.project_code}</span>}</h2>
+        <h2>📁 {project.name} {project.project_code && <CopyableCode code={project.project_code} />}</h2>
         <p style={{ color: 'var(--text-dim)', marginTop: 4 }}>{project.description || 'No description'}</p>
         {project.repo && <p style={{ color: 'var(--text-dim)', marginTop: 4 }}>📦 {project.repo}</p>}
         <div className="text-dim">Owner: {project.owner_name || 'Unknown'}</div>
diff --git a/src/pages/ProposeDetailPage.tsx b/src/pages/ProposeDetailPage.tsx
index 59c0b06..045bc56 100644
--- a/src/pages/ProposeDetailPage.tsx
+++ b/src/pages/ProposeDetailPage.tsx
@@ -3,6 +3,7 @@ import { useParams, useNavigate, useSearchParams } from 'react-router-dom'
 import api from '@/services/api'
 import type { Propose, Milestone } from '@/types'
 import dayjs from 'dayjs'
+import CopyableCode from '@/components/CopyableCode'
 
 export default function ProposeDetailPage() {
   const { id } = useParams()
@@ -124,7 +125,7 @@ export default function ProposeDetailPage() {
       <div className="task-header">
         <h2>
           💡 {propose.title}
-          {propose.propose_code && <span className="badge" style={{ marginLeft: 8 }}>{propose.propose_code}</span>}
+          {propose.propose_code && <span style={{ marginLeft: 8 }}><CopyableCode code={propose.propose_code} /></span>}
         </h2>
         <span className={`badge ${statusBadgeClass(propose.status)}`} style={{ fontSize: '1rem' }}>
           {propose.status}
@@ -136,7 +137,7 @@ export default function ProposeDetailPage() {
       <div className="section">
         <h3>Details</h3>
         <div className="detail-grid">
-          <div><strong>Propose Code:</strong> {propose.propose_code || '—'}</div>
+          <div><strong>Propose Code:</strong> {propose.propose_code ? <CopyableCode code={propose.propose_code} /> : '—'}</div>
           <div><strong>Status:</strong> {propose.status}</div>
           <div><strong>Created By:</strong> {propose.created_by_username || (propose.created_by_id ? `User #${propose.created_by_id}` : '—')}</div>
           <div><strong>Created:</strong> {dayjs(propose.created_at).format('YYYY-MM-DD HH:mm')}</div>
diff --git a/src/pages/SupportDetailPage.tsx b/src/pages/SupportDetailPage.tsx
index 3c42fe0..f36def5 100644
--- a/src/pages/SupportDetailPage.tsx
+++ b/src/pages/SupportDetailPage.tsx
@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react'
 import { useParams, useNavigate } from 'react-router-dom'
 import api from '@/services/api'
 import { useAuth } from '@/hooks/useAuth'
+import CopyableCode from '@/components/CopyableCode'
 
 interface SupportItem {
   id: number
@@ -141,7 +142,7 @@ export default function SupportDetailPage() {
       <button className="btn-back" onClick={() => navigate(-1)}>← Back</button>
 
       <div className="task-header">
-        <h2>🎫 {support.support_code || `#${support.id}`}</h2>
+        <h2>🎫 {support.support_code ? <CopyableCode code={support.support_code} /> : `#${support.id}`}</h2>
         <div className="task-meta">
           <span className={`badge status-${support.status}`}>{support.status}</span>
           <span className={`badge priority-${support.priority}`}>{support.priority}</span>
diff --git a/src/pages/TaskDetailPage.tsx b/src/pages/TaskDetailPage.tsx
index 27f23a1..63a5fbb 100644
--- a/src/pages/TaskDetailPage.tsx
+++ b/src/pages/TaskDetailPage.tsx
@@ -5,6 +5,7 @@ import type { Task, Comment, Project, ProjectMember, Milestone } from '@/types'
 import dayjs from 'dayjs'
 import { useAuth } from '@/hooks/useAuth'
 import CreateTaskModal from '@/components/CreateTaskModal'
+import CopyableCode from '@/components/CopyableCode'
 
 export default function TaskDetailPage() {
   const { id } = useParams()
@@ -120,7 +121,7 @@ export default function TaskDetailPage() {
       <button className="btn-back" onClick={() => navigate('/tasks')}>← Back</button>
 
       <div className="task-header">
-        <h2>{task.task_code ? `[${task.task_code}]` : `#${task.id}`} {task.title}</h2>
+        <h2>{task.task_code ? <><CopyableCode code={task.task_code} /> </> : `#${task.id} `}{task.title}</h2>
         <div className="task-meta">
           <span className={`badge status-${task.status}`}>{task.status}</span>
           <span className={`badge priority-${task.priority}`}>{task.priority}</span>