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+# Music YouTube Tab Frontend Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** MusicStudio 페이지에 🎯 YouTube 탭을 추가하고, 영상 제작 / 수익 추적 / 시장 트렌드 3개 서브탭을 구현한다.
+
+**Architecture:** MusicStudio.jsx의 기존 탭 state에 `'youtube'`를 추가하고 YoutubeTab 컴포넌트를 조건부 렌더링한다. YoutubeTab은 서브탭 state를 갖고 VideoProjectsTab / RevenueTab / TrendsTab을 렌더링한다. Library 탭의 LibraryCard에 "YouTube 프로젝트" 버튼을 추가해 트랙을 pre-select한 채 YouTube 탭으로 이동할 수 있다.
+
+**Tech Stack:** React 18, Vite, plain fetch API helper (apiGet/apiPost/apiPut/apiDelete), CSS (MusicStudio.css 확장)
+
+---
+
+## 파일 구조
+
+| 파일 | 변경 |
+|------|------|
+| `src/api.js` | 비디오/수익/트렌드 API 함수 추가 (파일 끝에 append) |
+| `src/pages/music/MusicStudio.jsx` | YouTube 탭 버튼, YoutubeTab 렌더링, LibraryCard 버튼, initialTrackId state |
+| `src/pages/music/MusicStudio.css` | `.yt-*` CSS 클래스 추가 |
+| `src/pages/music/components/YoutubeTab.jsx` | 신규 — 서브탭 shell |
+| `src/pages/music/components/VideoProjectsTab.jsx` | 신규 — 영상 제작 서브탭 |
+| `src/pages/music/components/RevenueTab.jsx` | 신규 — 수익 추적 서브탭 |
+| `src/pages/music/components/TrendsTab.jsx` | 신규 — 시장 트렌드 서브탭 |
+
+---
+
+## Task 1: Feature 브랜치 생성 + API 함수 추가
+
+**작업 위치:** `/Users/jaeohpark/development/web-page/`
+
+**Files:**
+- Modify: `src/api.js` (파일 끝에 append)
+
+- [ ] **Step 1: Feature 브랜치 생성**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git checkout -b feat/music-youtube-tab
+```
+
+- [ ] **Step 2: `src/api.js` 파일 끝에 YouTube/Revenue/Trends API 함수 추가**
+
+현재 파일은 628행. 파일 끝(`triggerLottoCurate` 함수 닫는 브레이스 다음)에 아래를 추가한다.
+
+```js
+// ── Music Lab — Video Projects ────────────────────
+export const createVideoProject  = (data) => apiPost('/api/music/video-project', data);
+export const getVideoProjects     = ()     => apiGet('/api/music/video-projects');
+export const renderVideoProject   = (id)   => apiPost(`/api/music/video-project/${id}/render`);
+export const exportVideoProject   = (id)   => apiGet(`/api/music/video-project/${id}/export`);
+export const deleteVideoProject   = (id)   => apiDelete(`/api/music/video-project/${id}`);
+
+// ── Music Lab — Revenue ───────────────────────────
+export const getRevenueDashboard  = ()         => apiGet('/api/music/revenue/dashboard');
+export const getRevenueRecords    = ()         => apiGet('/api/music/revenue');
+export const addRevenueRecord     = (data)     => apiPost('/api/music/revenue', data);
+export const updateRevenueRecord  = (id, data) => apiPut(`/api/music/revenue/${id}`, data);
+export const deleteRevenueRecord  = (id)       => apiDelete(`/api/music/revenue/${id}`);
+
+// ── Music Lab — Market Trends ─────────────────────
+export const getLatestTrendReport  = ()    => apiGet('/api/music/market/report/latest');
+export const getTrendReports       = ()    => apiGet('/api/music/market/report');
+export const getMarketSuggestions  = ()    => apiGet('/api/music/market/suggest');
+export const triggerYoutubeResearch = ()   => apiPost('/api/agent-office/youtube/research', {});
+```
+
+- [ ] **Step 3: 브라우저 확인 불필요 (함수만 추가, 타입 오류 없음). dev 서버 시작 확인.**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+npm run dev
+```
+
+Expected: 콘솔에 에러 없이 `http://localhost:5173` (또는 포트 출력) 기동.
+
+- [ ] **Step 4: 커밋**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git add src/api.js
+git commit -m "feat(api): video-project / revenue / market-trends API 함수 추가"
+```
+
+---
+
+## Task 2: YoutubeTab.jsx — 서브탭 shell
+
+**작업 위치:** `/Users/jaeohpark/development/web-page/`
+
+**Files:**
+- Create: `src/pages/music/components/YoutubeTab.jsx`
+
+- [ ] **Step 1: `YoutubeTab.jsx` 생성**
+
+```jsx
+// src/pages/music/components/YoutubeTab.jsx
+import { useState, useEffect } from 'react';
+import VideoProjectsTab from './VideoProjectsTab';
+import RevenueTab from './RevenueTab';
+import TrendsTab from './TrendsTab';
+
+export default function YoutubeTab({ library, initialTrackId, onClearInitialTrack }) {
+    const [subtab, setSubtab] = useState('video');
+
+    // initialTrackId가 들어오면 video 서브탭으로 전환
+    useEffect(() => {
+        if (initialTrackId) setSubtab('video');
+    }, [initialTrackId]);
+
+    return (
+        <div className="yt-container">
+            <nav className="yt-subtabs">
+                <button
+                    type="button"
+                    className={`yt-subtab ${subtab === 'video' ? 'is-active' : ''}`}
+                    onClick={() => setSubtab('video')}
+                >
+                    🎬 영상 제작
+                </button>
+                <button
+                    type="button"
+                    className={`yt-subtab ${subtab === 'revenue' ? 'is-active' : ''}`}
+                    onClick={() => setSubtab('revenue')}
+                >
+                    💰 수익 추적
+                </button>
+                <button
+                    type="button"
+                    className={`yt-subtab ${subtab === 'trends' ? 'is-active' : ''}`}
+                    onClick={() => setSubtab('trends')}
+                >
+                    📊 시장 트렌드
+                </button>
+            </nav>
+
+            {subtab === 'video' && (
+                <VideoProjectsTab
+                    library={library}
+                    initialTrackId={initialTrackId}
+                    onClearInitialTrack={onClearInitialTrack}
+                />
+            )}
+            {subtab === 'revenue' && <RevenueTab />}
+            {subtab === 'trends' && <TrendsTab />}
+        </div>
+    );
+}
+```
+
+- [ ] **Step 2: 커밋**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git add src/pages/music/components/YoutubeTab.jsx
+git commit -m "feat(youtube-tab): YoutubeTab 서브탭 shell 컴포넌트"
+```
+
+---
+
+## Task 3: VideoProjectsTab.jsx — 영상 제작 서브탭
+
+**작업 위치:** `/Users/jaeohpark/development/web-page/`
+
+**Files:**
+- Create: `src/pages/music/components/VideoProjectsTab.jsx`
+
+> **참고:** `video-projects` API 응답 형식은 `{ projects: [...] }` 또는 배열 직접 반환일 수 있다. 양쪽 모두 처리한다.
+
+- [ ] **Step 1: `VideoProjectsTab.jsx` 생성**
+
+```jsx
+// src/pages/music/components/VideoProjectsTab.jsx
+import { useState, useEffect, useRef } from 'react';
+import {
+    createVideoProject, getVideoProjects,
+    renderVideoProject, exportVideoProject, deleteVideoProject,
+} from '../../../api';
+
+const COUNTRY_OPTIONS = ['BR', 'US', 'ID', 'MX', 'KR'];
+const COUNTRY_FLAGS   = { BR: '🇧🇷', US: '🇺🇸', ID: '🇮🇩', MX: '🇲🇽', KR: '🇰🇷' };
+
+export default function VideoProjectsTab({ library, initialTrackId, onClearInitialTrack }) {
+    const [projects,       setProjects]       = useState([]);
+    const [selectedTrackId, setSelectedTrackId] = useState(initialTrackId ?? '');
+    const [format,         setFormat]         = useState('visualizer');
+    const [countries,      setCountries]      = useState(['BR']);
+    const [creating,       setCreating]       = useState(false);
+    const [exportData,     setExportData]     = useState(null);
+    const [exportingId,    setExportingId]    = useState(null);
+    const pollRef = useRef(null);
+
+    // initialTrackId prop 반영
+    useEffect(() => {
+        if (initialTrackId) {
+            setSelectedTrackId(String(initialTrackId));
+            onClearInitialTrack?.();
+        }
+    }, [initialTrackId]);
+
+    const loadProjects = async () => {
+        try {
+            const data = await getVideoProjects();
+            setProjects(Array.isArray(data) ? data : data.projects ?? []);
+        } catch (e) {
+            console.error('getVideoProjects:', e);
+        }
+    };
+
+    useEffect(() => { loadProjects(); }, []);
+
+    // 렌더링 중인 프로젝트가 있으면 5초마다 폴링
+    useEffect(() => {
+        const hasRendering = projects.some(p => p.status === 'rendering');
+        if (hasRendering && !pollRef.current) {
+            pollRef.current = setInterval(loadProjects, 5000);
+        } else if (!hasRendering && pollRef.current) {
+            clearInterval(pollRef.current);
+            pollRef.current = null;
+        }
+        return () => {
+            if (pollRef.current) { clearInterval(pollRef.current); pollRef.current = null; }
+        };
+    }, [projects]);
+
+    const toggleCountry = (c) => {
+        setCountries(prev =>
+            prev.includes(c) ? prev.filter(x => x !== c) : [...prev, c]
+        );
+    };
+
+    const handleCreate = async () => {
+        if (!selectedTrackId || countries.length === 0) return;
+        setCreating(true);
+        try {
+            await createVideoProject({
+                track_id: Number(selectedTrackId),
+                format,
+                target_countries: countries,
+            });
+            await loadProjects();
+        } catch (e) {
+            console.error('createVideoProject:', e);
+        } finally {
+            setCreating(false);
+        }
+    };
+
+    const handleRender = async (id) => {
+        try {
+            await renderVideoProject(id);
+            await loadProjects();
+        } catch (e) {
+            console.error('renderVideoProject:', e);
+        }
+    };
+
+    const handleExport = async (id) => {
+        setExportingId(id);
+        try {
+            const data = await exportVideoProject(id);
+            setExportData({ id, ...data });
+        } catch (e) {
+            console.error('exportVideoProject:', e);
+        } finally {
+            setExportingId(null);
+        }
+    };
+
+    const handleDelete = async (id) => {
+        if (!window.confirm('이 프로젝트를 삭제할까요?')) return;
+        try {
+            await deleteVideoProject(id);
+            setProjects(prev => prev.filter(p => p.id !== id));
+            if (exportData?.id === id) setExportData(null);
+        } catch (e) {
+            console.error('deleteVideoProject:', e);
+        }
+    };
+
+    return (
+        <div className="yt-content">
+            {/* ① 새 영상 만들기 */}
+            <div className="yt-card yt-card--create">
+                <h3 className="yt-card__title">① 새 영상 만들기</h3>
+                <div className="yt-row">
+                    <select
+                        className="yt-select"
+                        value={selectedTrackId}
+                        onChange={e => setSelectedTrackId(e.target.value)}
+                    >
+                        <option value="">📚 트랙 선택...</option>
+                        {(library ?? []).map(t => (
+                            <option key={t.id} value={String(t.id)}>{t.title}</option>
+                        ))}
+                    </select>
+                    <div className="yt-format-toggle">
+                        {['visualizer', 'slideshow'].map(f => (
+                            <button
+                                key={f}
+                                type="button"
+                                className={`yt-format-btn ${format === f ? 'is-active' : ''}`}
+                                onClick={() => setFormat(f)}
+                            >
+                                {f === 'visualizer' ? '비주얼라이저' : '슬라이드쇼'}
+                            </button>
+                        ))}
+                    </div>
+                </div>
+                <div className="yt-country-label">타겟 국가 (복수 선택)</div>
+                <div className="yt-country-chips">
+                    {COUNTRY_OPTIONS.map(c => (
+                        <button
+                            key={c}
+                            type="button"
+                            className={`yt-chip ${countries.includes(c) ? 'is-active' : ''}`}
+                            onClick={() => toggleCountry(c)}
+                        >
+                            {COUNTRY_FLAGS[c]} {c}
+                        </button>
+                    ))}
+                </div>
+                <button
+                    type="button"
+                    className="ms-btn ms-btn--primary yt-create-btn"
+                    onClick={handleCreate}
+                    disabled={creating || !selectedTrackId || countries.length === 0}
+                >
+                    {creating ? '생성 중...' : '프로젝트 생성'}
+                </button>
+            </div>
+
+            {/* ② 프로젝트 목록 */}
+            <div className="yt-card">
+                <h3 className="yt-card__title">② 영상 프로젝트</h3>
+                {projects.length === 0 ? (
+                    <p className="yt-empty">트랙을 선택해 영상을 만들어보세요</p>
+                ) : (
+                    <div className="yt-project-list">
+                        {projects.map(p => (
+                            <ProjectCard
+                                key={p.id}
+                                project={p}
+                                onRender={handleRender}
+                                onExport={handleExport}
+                                onDelete={handleDelete}
+                                isExporting={exportingId === p.id}
+                            />
+                        ))}
+                    </div>
+                )}
+            </div>
+
+            {/* ③ 내보내기 패키지 */}
+            {exportData && (
+                <div className="yt-card yt-card--export">
+                    <h3 className="yt-card__title">③ 내보내기 패키지</h3>
+                    <div className="yt-export-links">
+                        {exportData.mp4_url && (
+                            <a href={exportData.mp4_url} download className="ms-btn ms-btn--ghost ms-btn--sm">
+                                📹 output.mp4 다운로드
+                            </a>
+                        )}
+                        {exportData.thumbnail_url && (
+                            <a href={exportData.thumbnail_url} download className="ms-btn ms-btn--ghost ms-btn--sm">
+                                🖼️ thumbnail.jpg
+                            </a>
+                        )}
+                    </div>
+                    {exportData.metadata && (
+                        <div className="yt-meta-preview">
+                            <div className="yt-meta-preview__label">metadata.json 미리보기</div>
+                            <pre className="yt-meta-preview__content">
+                                {JSON.stringify(exportData.metadata, null, 2)}
+                            </pre>
+                        </div>
+                    )}
+                </div>
+            )}
+        </div>
+    );
+}
+
+function ProjectCard({ project, onRender, onExport, onDelete, isExporting }) {
+    const STATUS_MAP = {
+        pending:   { text: '대기',    cls: 'yt-status--pending' },
+        rendering: { text: '⚙ 처리중', cls: 'yt-status--rendering' },
+        done:      { text: '✓ 완료',  cls: 'yt-status--done' },
+        failed:    { text: '실패',    cls: 'yt-status--failed' },
+    };
+    const s = STATUS_MAP[project.status] ?? { text: project.status, cls: '' };
+
+    return (
+        <div className="yt-project-card">
+            <div className="yt-project-card__icon">
+                {project.status === 'rendering' ? '⚙️' : project.status === 'done' ? '🎬' : '🎵'}
+            </div>
+            <div className="yt-project-card__info">
+                <div className="yt-project-card__title">
+                    {project.title ?? `프로젝트 #${project.id}`}
+                </div>
+                <div className="yt-project-card__meta">
+                    {project.format} · {(project.target_countries ?? []).join(' ')}
+                </div>
+                {project.status === 'rendering' && (
+                    <div className="yt-progress-bar">
+                        <div className="yt-progress-bar__fill" />
+                    </div>
+                )}
+            </div>
+            <span className={`yt-status ${s.cls}`}>{s.text}</span>
+            {project.status === 'pending' && (
+                <button
+                    type="button"
+                    className="ms-btn ms-btn--ghost ms-btn--sm"
+                    onClick={() => onRender(project.id)}
+                >
+                    ▶ 렌더
+                </button>
+            )}
+            {project.status === 'done' && (
+                <button
+                    type="button"
+                    className="ms-btn ms-btn--ghost ms-btn--sm"
+                    onClick={() => onExport(project.id)}
+                    disabled={isExporting}
+                >
+                    {isExporting ? '...' : '↓ 내보내기'}
+                </button>
+            )}
+            <button
+                type="button"
+                className="ms-btn--icon ms-btn--danger"
+                onClick={() => onDelete(project.id)}
+                aria-label="삭제"
+            >
+                ✕
+            </button>
+        </div>
+    );
+}
+```
+
+- [ ] **Step 2: 커밋**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git add src/pages/music/components/VideoProjectsTab.jsx
+git commit -m "feat(youtube-tab): VideoProjectsTab 영상 제작 서브탭"
+```
+
+---
+
+## Task 4: RevenueTab.jsx — 수익 추적 서브탭
+
+**Files:**
+- Create: `src/pages/music/components/RevenueTab.jsx`
+
+- [ ] **Step 1: `RevenueTab.jsx` 생성**
+
+```jsx
+// src/pages/music/components/RevenueTab.jsx
+import { useState, useEffect } from 'react';
+import {
+    getRevenueDashboard, getRevenueRecords,
+    addRevenueRecord, updateRevenueRecord, deleteRevenueRecord,
+} from '../../../api';
+
+const COUNTRIES = ['BR', 'US', 'ID', 'MX', 'KR'];
+const currentMonth = () => new Date().toISOString().slice(0, 7);
+
+export default function RevenueTab() {
+    const [dashboard,  setDashboard]  = useState(null);
+    const [records,    setRecords]    = useState([]);
+    const [form,       setForm]       = useState({
+        yt_video_id: '', record_month: currentMonth(),
+        revenue_usd: '', views: '', country: 'BR',
+    });
+    const [saving,     setSaving]     = useState(false);
+    const [editingId,  setEditingId]  = useState(null);
+    const [editForm,   setEditForm]   = useState({});
+
+    const loadAll = async () => {
+        const [dash, recs] = await Promise.all([
+            getRevenueDashboard().catch(() => null),
+            getRevenueRecords().catch(() => []),
+        ]);
+        setDashboard(dash);
+        setRecords(Array.isArray(recs) ? recs : recs.records ?? []);
+    };
+
+    useEffect(() => { loadAll(); }, []);
+
+    const handleAdd = async () => {
+        if (!form.yt_video_id || !form.revenue_usd || !form.views) return;
+        setSaving(true);
+        try {
+            await addRevenueRecord({
+                yt_video_id:  form.yt_video_id,
+                record_month: form.record_month,
+                revenue_usd:  parseFloat(form.revenue_usd),
+                views:        parseInt(form.views, 10),
+                country:      form.country,
+            });
+            setForm({ yt_video_id: '', record_month: currentMonth(), revenue_usd: '', views: '', country: 'BR' });
+            await loadAll();
+        } catch (e) {
+            console.error('addRevenueRecord:', e);
+        } finally {
+            setSaving(false);
+        }
+    };
+
+    const handleEditSave = async () => {
+        try {
+            await updateRevenueRecord(editingId, {
+                revenue_usd: parseFloat(editForm.revenue_usd),
+                views:       parseInt(editForm.views, 10),
+            });
+            setEditingId(null);
+            await loadAll();
+        } catch (e) {
+            console.error('updateRevenueRecord:', e);
+        }
+    };
+
+    const handleDelete = async (id) => {
+        if (!window.confirm('이 기록을 삭제할까요?')) return;
+        try {
+            await deleteRevenueRecord(id);
+            await loadAll();
+        } catch (e) {
+            console.error('deleteRevenueRecord:', e);
+        }
+    };
+
+    // 영상별 RPM 상위 5개 (bar chart 용)
+    const chartData = records
+        .filter(r => r.views > 0)
+        .map(r => ({
+            label: r.yt_video_id,
+            rpm:   (r.revenue_usd / r.views) * 1000,
+        }))
+        .sort((a, b) => b.rpm - a.rpm)
+        .slice(0, 5);
+    const maxRpm = chartData.length > 0 ? Math.max(...chartData.map(d => d.rpm)) : 1;
+
+    return (
+        <div className="yt-content">
+            {/* 대시보드 카드 3개 */}
+            <div className="yt-dash-cards">
+                <div className="yt-dash-card">
+                    <div className="yt-dash-card__label">총 수익</div>
+                    <div className="yt-dash-card__value yt-dash-card__value--green">
+                        ${dashboard?.total_revenue_usd?.toFixed(2) ?? '—'}
+                    </div>
+                    <div className="yt-dash-card__sub">누적</div>
+                </div>
+                <div className="yt-dash-card">
+                    <div className="yt-dash-card__label">총 조회수</div>
+                    <div className="yt-dash-card__value yt-dash-card__value--blue">
+                        {dashboard?.total_views != null
+                            ? (dashboard.total_views >= 1000
+                                ? `${(dashboard.total_views / 1000).toFixed(1)}K`
+                                : String(dashboard.total_views))
+                            : '—'}
+                    </div>
+                    <div className="yt-dash-card__sub">누적</div>
+                </div>
+                <div className="yt-dash-card">
+                    <div className="yt-dash-card__label">평균 RPM</div>
+                    <div className="yt-dash-card__value yt-dash-card__value--amber">
+                        ${dashboard?.avg_rpm?.toFixed(2) ?? '—'}
+                    </div>
+                    <div className="yt-dash-card__sub">가중평균</div>
+                </div>
+            </div>
+
+            {/* 영상별 RPM 바 차트 */}
+            {chartData.length > 0 && (
+                <div className="yt-card">
+                    <h3 className="yt-card__title">영상별 RPM 비교</h3>
+                    <div className="yt-bar-chart">
+                        {chartData.map((d, i) => (
+                            <div key={i} className="yt-bar-row">
+                                <div className="yt-bar-row__label" title={d.label}>
+                                    {d.label.slice(0, 11)}
+                                </div>
+                                <div className="yt-bar-row__track">
+                                    <div
+                                        className="yt-bar-row__fill"
+                                        style={{ width: `${(d.rpm / maxRpm) * 100}%` }}
+                                    />
+                                </div>
+                                <div className="yt-bar-row__value">${d.rpm.toFixed(2)}</div>
+                            </div>
+                        ))}
+                    </div>
+                </div>
+            )}
+
+            {/* 수익 기록 추가 폼 */}
+            <div className="yt-card yt-card--create">
+                <h3 className="yt-card__title">+ 수익 기록 추가</h3>
+                <div className="yt-form-grid">
+                    <div className="yt-field">
+                        <label className="yt-field__label">YouTube 영상 ID</label>
+                        <input
+                            className="yt-input"
+                            value={form.yt_video_id}
+                            onChange={e => setForm(f => ({ ...f, yt_video_id: e.target.value }))}
+                            placeholder="dQw4w9WgXcQ"
+                        />
+                    </div>
+                    <div className="yt-field">
+                        <label className="yt-field__label">기록 월</label>
+                        <input
+                            className="yt-input"
+                            type="month"
+                            value={form.record_month}
+                            onChange={e => setForm(f => ({ ...f, record_month: e.target.value }))}
+                        />
+                    </div>
+                    <div className="yt-field">
+                        <label className="yt-field__label">수익 (USD)</label>
+                        <input
+                            className="yt-input"
+                            type="number"
+                            step="0.01"
+                            value={form.revenue_usd}
+                            onChange={e => setForm(f => ({ ...f, revenue_usd: e.target.value }))}
+                            placeholder="3.45"
+                        />
+                    </div>
+                    <div className="yt-field">
+                        <label className="yt-field__label">조회수</label>
+                        <input
+                            className="yt-input"
+                            type="number"
+                            value={form.views}
+                            onChange={e => setForm(f => ({ ...f, views: e.target.value }))}
+                            placeholder="1200"
+                        />
+                    </div>
+                </div>
+                <div className="yt-row yt-row--bottom">
+                    <select
+                        className="yt-select"
+                        value={form.country}
+                        onChange={e => setForm(f => ({ ...f, country: e.target.value }))}
+                    >
+                        {COUNTRIES.map(c => <option key={c} value={c}>{c}</option>)}
+                    </select>
+                    <button
+                        type="button"
+                        className="ms-btn ms-btn--primary"
+                        onClick={handleAdd}
+                        disabled={saving}
+                    >
+                        {saving ? '저장 중...' : '저장'}
+                    </button>
+                </div>
+            </div>
+
+            {/* 수익 기록 테이블 */}
+            <div className="yt-card">
+                <h3 className="yt-card__title">수익 기록</h3>
+                {records.length === 0 ? (
+                    <p className="yt-empty">수익 기록이 없습니다. 위 폼으로 추가해보세요.</p>
+                ) : (
+                    <div className="yt-table">
+                        <div className="yt-table__header">
+                            <span>영상 ID</span>
+                            <span>월</span>
+                            <span>수익</span>
+                            <span>조회수</span>
+                            <span>RPM</span>
+                            <span />
+                        </div>
+                        {records.map(rec => (
+                            editingId === rec.id ? (
+                                <div key={rec.id} className="yt-table__row yt-table__row--editing">
+                                    <span className="yt-table__cell">{rec.yt_video_id.slice(0, 11)}</span>
+                                    <span className="yt-table__cell">{rec.record_month}</span>
+                                    <input
+                                        className="yt-input yt-input--sm"
+                                        type="number"
+                                        step="0.01"
+                                        value={editForm.revenue_usd}
+                                        onChange={e => setEditForm(f => ({ ...f, revenue_usd: e.target.value }))}
+                                    />
+                                    <input
+                                        className="yt-input yt-input--sm"
+                                        type="number"
+                                        value={editForm.views}
+                                        onChange={e => setEditForm(f => ({ ...f, views: e.target.value }))}
+                                    />
+                                    <span className="yt-table__cell">—</span>
+                                    <div className="yt-table__actions">
+                                        <button type="button" className="ms-btn ms-btn--primary ms-btn--sm" onClick={handleEditSave}>저장</button>
+                                        <button type="button" className="ms-btn ms-btn--ghost ms-btn--sm" onClick={() => setEditingId(null)}>취소</button>
+                                    </div>
+                                </div>
+                            ) : (
+                                <div
+                                    key={rec.id}
+                                    className="yt-table__row"
+                                    onClick={() => {
+                                        setEditingId(rec.id);
+                                        setEditForm({ revenue_usd: rec.revenue_usd, views: rec.views });
+                                    }}
+                                    style={{ cursor: 'pointer' }}
+                                >
+                                    <span className="yt-table__cell yt-table__cell--mono">{rec.yt_video_id.slice(0, 11)}</span>
+                                    <span className="yt-table__cell">{rec.record_month}</span>
+                                    <span className="yt-table__cell yt-table__cell--green">${rec.revenue_usd?.toFixed(2)}</span>
+                                    <span className="yt-table__cell">{rec.views?.toLocaleString()}</span>
+                                    <span className="yt-table__cell yt-table__cell--amber">
+                                        {rec.views > 0
+                                            ? `$${((rec.revenue_usd / rec.views) * 1000).toFixed(2)}`
+                                            : '—'}
+                                    </span>
+                                    <button
+                                        type="button"
+                                        className="ms-btn--icon ms-btn--danger"
+                                        onClick={e => { e.stopPropagation(); handleDelete(rec.id); }}
+                                        aria-label="삭제"
+                                    >✕</button>
+                                </div>
+                            )
+                        ))}
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+}
+```
+
+- [ ] **Step 2: 커밋**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git add src/pages/music/components/RevenueTab.jsx
+git commit -m "feat(youtube-tab): RevenueTab 수익 추적 서브탭"
+```
+
+---
+
+## Task 5: TrendsTab.jsx — 시장 트렌드 서브탭
+
+**Files:**
+- Create: `src/pages/music/components/TrendsTab.jsx`
+
+- [ ] **Step 1: `TrendsTab.jsx` 생성**
+
+```jsx
+// src/pages/music/components/TrendsTab.jsx
+import { useState, useEffect } from 'react';
+import {
+    getLatestTrendReport, getTrendReports,
+    getMarketSuggestions, triggerYoutubeResearch,
+} from '../../../api';
+
+const FLAG = { BR: '🇧🇷', US: '🇺🇸', ID: '🇮🇩', MX: '🇲🇽', KR: '🇰🇷' };
+
+export default function TrendsTab() {
+    const [latestReport,    setLatestReport]    = useState(null);
+    const [reports,         setReports]         = useState([]);
+    const [suggestions,     setSuggestions]     = useState([]);
+    const [selectedReport,  setSelectedReport]  = useState(null);
+    const [researching,     setResearching]     = useState(false);
+    const [copiedIdx,       setCopiedIdx]       = useState(null);
+
+    const loadAll = async () => {
+        const [latest, rpts, sugg] = await Promise.all([
+            getLatestTrendReport().catch(() => null),
+            getTrendReports().catch(() => []),
+            getMarketSuggestions().catch(() => []),
+        ]);
+        setLatestReport(latest);
+        setReports(Array.isArray(rpts) ? rpts : rpts.reports ?? []);
+        setSuggestions(Array.isArray(sugg) ? sugg : sugg.suggestions ?? []);
+    };
+
+    useEffect(() => { loadAll(); }, []);
+
+    const handleResearch = async () => {
+        setResearching(true);
+        try {
+            await triggerYoutubeResearch();
+        } catch (e) {
+            console.error('triggerYoutubeResearch:', e);
+        } finally {
+            setResearching(false);
+        }
+    };
+
+    const handleCopy = (text, idx) => {
+        navigator.clipboard.writeText(text).then(() => {
+            setCopiedIdx(idx);
+            setTimeout(() => setCopiedIdx(null), 2000);
+        });
+    };
+
+    // 선택된 리포트가 있으면 그것, 없으면 최신 리포트의 장르 표시
+    const displayReport = selectedReport ?? latestReport;
+    const topGenres = displayReport?.top_genres?.slice(0, 5) ?? [];
+    const maxScore  = topGenres.length > 0 ? Math.max(...topGenres.map(g => g.score)) : 1;
+
+    return (
+        <div className="yt-content">
+            {/* 수집 상태 바 */}
+            <div className="yt-status-bar">
+                <div className="yt-status-bar__left">
+                    <span className="yt-status-dot" />
+                    <span className="yt-status-bar__text">
+                        마지막 수집: <strong>{latestReport?.report_date ?? '없음'}</strong>
+                        {latestReport && ` · ${latestReport.top_genres?.length ?? 0}개 장르`}
+                    </span>
+                </div>
+                <button
+                    type="button"
+                    className="ms-btn ms-btn--ghost ms-btn--sm"
+                    onClick={handleResearch}
+                    disabled={researching}
+                >
+                    {researching ? '수집 중...' : '↻ 수동 수집'}
+                </button>
+            </div>
+
+            {/* 인기 장르 Top 5 */}
+            <div className="yt-card">
+                <h3 className="yt-card__title">🔥 오늘의 인기 장르 Top 5</h3>
+                {topGenres.length === 0 ? (
+                    <p className="yt-empty">
+                        트렌드 데이터가 없습니다. 수동 수집을 실행하거나 agent-office가 내일 09:00에 자동 수집합니다.
+                    </p>
+                ) : (
+                    <div className="yt-bar-chart yt-bar-chart--genre">
+                        {topGenres.map((g, i) => (
+                            <div key={i} className="yt-bar-row">
+                                <div className="yt-bar-row__rank">#{i + 1}</div>
+                                <div className="yt-bar-row__info">
+                                    <div className="yt-bar-row__genre-header">
+                                        <span className="yt-bar-row__genre-name">{g.genre}</span>
+                                        <span className="yt-bar-row__flags">
+                                            {(g.countries ?? []).map(c => FLAG[c] ?? c).join(' ')}
+                                        </span>
+                                    </div>
+                                    <div className="yt-bar-row__track">
+                                        <div
+                                            className="yt-bar-row__fill yt-bar-row__fill--genre"
+                                            style={{ width: `${(g.score / maxScore) * 100}%` }}
+                                        />
+                                    </div>
+                                </div>
+                                <div className="yt-bar-row__value">{g.score}</div>
+                            </div>
+                        ))}
+                    </div>
+                )}
+            </div>
+
+            {/* Suno 프롬프트 추천 */}
+            {suggestions.length > 0 && (
+                <div className="yt-card">
+                    <h3 className="yt-card__title">✨ AI 추천 Suno 프롬프트</h3>
+                    <div className="yt-prompt-list">
+                        {suggestions.map((s, i) => (
+                            <div key={i} className="yt-prompt-card">
+                                <div className="yt-prompt-card__header">
+                                    <span className="yt-prompt-card__genre">{s.genre}</span>
+                                    <span className="yt-prompt-card__countries">
+                                        {(s.target_countries ?? []).map(c => FLAG[c] ?? c).join(' ')}
+                                    </span>
+                                </div>
+                                <button
+                                    type="button"
+                                    className="yt-prompt-card__text"
+                                    onClick={() => handleCopy(s.suno_prompt, i)}
+                                    title="클릭해서 복사"
+                                >
+                                    {s.suno_prompt}
+                                </button>
+                                {copiedIdx === i && (
+                                    <span className="yt-prompt-card__copied">✓ 복사됨</span>
+                                )}
+                                {s.reason && (
+                                    <div className="yt-prompt-card__reason">{s.reason}</div>
+                                )}
+                            </div>
+                        ))}
+                    </div>
+                </div>
+            )}
+
+            {/* 트렌드 리포트 이력 */}
+            <div className="yt-card">
+                <h3 className="yt-card__title">📋 트렌드 리포트 이력</h3>
+                {reports.length === 0 ? (
+                    <p className="yt-empty">리포트 이력이 없습니다</p>
+                ) : (
+                    <div className="yt-report-list">
+                        {reports.map(r => (
+                            <div
+                                key={r.id ?? r.report_date}
+                                className={`yt-report-row ${selectedReport?.report_date === r.report_date ? 'is-selected' : ''}`}
+                                onClick={() => setSelectedReport(
+                                    selectedReport?.report_date === r.report_date ? null : r
+                                )}
+                            >
+                                <span className="yt-report-row__date">
+                                    {r.report_date}
+                                    {r.report_date === latestReport?.report_date && (
+                                        <span className="yt-report-row__today"> ● 오늘</span>
+                                    )}
+                                </span>
+                                <span className="yt-report-row__meta">
+                                    {r.top_genres?.length ?? 0}개 장르 · {r.recommended_styles?.length ?? 0}개 추천
+                                </span>
+                                <span className="yt-report-row__action">보기 →</span>
+                            </div>
+                        ))}
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+}
+```
+
+- [ ] **Step 2: 커밋**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git add src/pages/music/components/TrendsTab.jsx
+git commit -m "feat(youtube-tab): TrendsTab 시장 트렌드 서브탭"
+```
+
+---
+
+## Task 6: MusicStudio.jsx 연결 + CSS + Library 버튼
+
+**Files:**
+- Modify: `src/pages/music/MusicStudio.jsx`
+- Modify: `src/pages/music/MusicStudio.css`
+
+### 6-A: MusicStudio.jsx import 추가
+
+- [ ] **Step 1: 파일 상단 import 블록에 YoutubeTab import 추가**
+
+`MusicStudio.jsx` 파일 상단에서 기존 import 블록을 찾는다 (RemixTab import 근처). 그 아래에 추가:
+
+```jsx
+import YoutubeTab from './components/YoutubeTab';
+```
+
+기존 import 블록 예시 (3~10행 근처):
+```jsx
+import LyricsTab from './components/LyricsTab';
+import RemixTab  from './components/RemixTab';
+// 이 아래에 추가:
+import YoutubeTab from './components/YoutubeTab';
+```
+
+### 6-B: MusicStudio 함수 내 상태 추가
+
+- [ ] **Step 2: `tab` state 선언 아래에 `initialTrackId` state 추가**
+
+현재 517행:
+```jsx
+const [tab, setTab] = useState('create');
+```
+
+이 바로 아래에 추가:
+```jsx
+const [initialTrackId, setInitialTrackId] = useState(null);
+```
+
+### 6-C: LibraryCard에 YouTube 프로젝트 버튼 추가
+
+- [ ] **Step 3: `LibraryCard` 컴포넌트 props에 `onVideoProject` 추가**
+
+현재 340행:
+```jsx
+const LibraryCard = ({ track, onDelete, onPlay, isPlaying, onExtend, onVocalRemoval, onCoverArt, onWavConvert, onStemSplit, onSyncedLyrics, onVideoGenerate, isGenerating }) => {
+```
+
+이를 아래로 교체:
+```jsx
+const LibraryCard = ({ track, onDelete, onPlay, isPlaying, onExtend, onVocalRemoval, onCoverArt, onWavConvert, onStemSplit, onSyncedLyrics, onVideoGenerate, onVideoProject, isGenerating }) => {
+```
+
+- [ ] **Step 4: `hasSunoId` 조건 블록의 `•••` 드롭다운 안에 YouTube 프로젝트 버튼 추가**
+
+현재 426~427행 (`🎬 Music Video` 버튼 다음):
+```jsx
+<button type="button" onClick={() => { onVideoGenerate(track); setMenuOpen(false); }}
+    disabled={isGenerating}>🎬 Music Video</button>
+```
+
+이 버튼 **아래**에 추가:
+```jsx
+<button type="button" onClick={() => { onVideoProject(track); setMenuOpen(false); }}>
+    🎯 YouTube 프로젝트
+</button>
+```
+
+### 6-D: Library 컴포넌트에 onVideoProject prop 전달
+
+- [ ] **Step 5: `Library` 컴포넌트 props에 `onVideoProject` 추가**
+
+현재 450행:
+```jsx
+const Library = ({ tracks, onDelete, onRefresh, onExtend, onVocalRemoval, onCoverArt, onWavConvert, onStemSplit, onSyncedLyrics, onVideoGenerate, isGenerating, loading }) => {
+```
+
+이를 아래로 교체:
+```jsx
+const Library = ({ tracks, onDelete, onRefresh, onExtend, onVocalRemoval, onCoverArt, onWavConvert, onStemSplit, onSyncedLyrics, onVideoGenerate, onVideoProject, isGenerating, loading }) => {
+```
+
+- [ ] **Step 6: `Library` 내부의 `LibraryCard` 렌더링에 `onVideoProject` prop 추가**
+
+현재 491~515행의 `<LibraryCard>` 렌더링 블록에서, 기존 `onVideoGenerate={onVideoGenerate}` 아래에:
+```jsx
+onVideoProject={onVideoProject}
+```
+
+추가한다.
+
+### 6-E: MusicStudio 함수 내 핸들러 추가
+
+- [ ] **Step 7: `handleVideoGenerate` 핸들러 근처에 `handleVideoProject` 핸들러 추가**
+
+`handleVideoGenerate` 함수를 찾아 (파일 내 `onVideoGenerate` 콜백 정의 위치) 그 바로 아래에 추가:
+
+```jsx
+const handleVideoProject = (track) => {
+    setInitialTrackId(track.id);
+    setTab('youtube');
+};
+```
+
+### 6-F: Library 렌더링 블록에 prop 연결
+
+- [ ] **Step 8: `tab === 'library'` 블록의 `<Library>` 컴포넌트에 `onVideoProject` prop 추가**
+
+현재 1129~1143행의 `<Library>` 컴포넌트에서, 기존 `onVideoGenerate={handleVideoGenerate}` 아래에:
+```jsx
+onVideoProject={handleVideoProject}
+```
+
+추가한다.
+
+### 6-G: YouTube 탭 버튼 추가
+
+- [ ] **Step 9: 탭 nav에 YouTube 탭 버튼 추가**
+
+현재 1117~1123행 (Remix 탭 버튼):
+```jsx
+<button
+    type="button"
+    className={`ms-tab ${tab === 'remix' ? 'is-active' : ''}`}
+    onClick={() => setTab('remix')}
+>
+    <span className="ms-tab__icon">🔄</span> Remix
+</button>
+```
+
+이 버튼 **다음**에 추가:
+```jsx
+<button
+    type="button"
+    className={`ms-tab ms-tab--youtube ${tab === 'youtube' ? 'is-active' : ''}`}
+    onClick={() => setTab('youtube')}
+>
+    <span className="ms-tab__icon">🎯</span> YouTube
+</button>
+```
+
+### 6-H: YouTube 탭 콘텐츠 렌더링 추가
+
+- [ ] **Step 10: Remix 탭 렌더 블록 다음에 YouTube 탭 렌더 블록 추가**
+
+현재 1151~1167행 (Remix 탭 렌더):
+```jsx
+{/* ═══ REMIX TAB ═══ */}
+{tab === 'remix' && (
+    <RemixTab ... />
+)}
+```
+
+이 블록 **다음**에 추가:
+```jsx
+{/* ═══ YOUTUBE TAB ═══ */}
+{tab === 'youtube' && (
+    <YoutubeTab
+        library={library}
+        initialTrackId={initialTrackId}
+        onClearInitialTrack={() => setInitialTrackId(null)}
+    />
+)}
+```
+
+### 6-I: CSS 추가
+
+- [ ] **Step 11: `MusicStudio.css` 파일 끝에 YouTube 탭 스타일 추가**
+
+```css
+/* ══════════════════════════════════════════
+   YouTube Tab — yt-* classes
+══════════════════════════════════════════ */
+
+/* YouTube 탭 버튼 강조 (amber) */
+.ms-tab--youtube.is-active {
+    color: #f59e0b;
+    border-bottom-color: #f59e0b;
+}
+
+.yt-container {
+    display: flex;
+    flex-direction: column;
+    gap: 0;
+}
+
+/* ── 서브탭 네비게이션 ── */
+.yt-subtabs {
+    display: flex;
+    border-bottom: 1px solid #1f2937;
+    background: #0d1117;
+    padding: 0 16px;
+}
+
+.yt-subtab {
+    padding: 10px 18px;
+    font-size: 12px;
+    color: #6b7280;
+    background: none;
+    border: none;
+    border-bottom: 2px solid transparent;
+    cursor: pointer;
+    transition: color 0.15s, border-color 0.15s;
+    white-space: nowrap;
+}
+
+.yt-subtab:hover { color: #9ca3af; }
+
+.yt-subtab.is-active {
+    color: #22c55e;
+    border-bottom-color: #22c55e;
+    font-weight: 600;
+}
+
+/* ── 공통 콘텐츠 래퍼 ── */
+.yt-content {
+    display: flex;
+    flex-direction: column;
+    gap: 14px;
+    padding: 16px;
+}
+
+/* ── 카드 ── */
+.yt-card {
+    background: #0d1117;
+    border: 1px solid #1f2937;
+    border-radius: 10px;
+    padding: 14px;
+}
+
+.yt-card--create {
+    border-color: #22c55e33;
+}
+
+.yt-card--export {
+    border-color: #3b82f633;
+    border-style: dashed;
+}
+
+.yt-card__title {
+    font-size: 12px;
+    font-weight: 700;
+    color: #ccc;
+    margin: 0 0 12px;
+}
+
+.yt-card--create .yt-card__title { color: #86efac; }
+.yt-card--export .yt-card__title { color: #93c5fd; }
+
+/* ── 행 레이아웃 ── */
+.yt-row {
+    display: flex;
+    gap: 8px;
+    margin-bottom: 10px;
+    align-items: center;
+}
+
+.yt-row--bottom {
+    margin-bottom: 0;
+    margin-top: 8px;
+}
+
+/* ── 폼 그리드 ── */
+.yt-form-grid {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 8px;
+    margin-bottom: 0;
+}
+
+.yt-field { display: flex; flex-direction: column; gap: 4px; }
+
+.yt-field__label {
+    font-size: 10px;
+    color: #6b7280;
+}
+
+.yt-input {
+    background: #1f2937;
+    border: 1px solid #374151;
+    border-radius: 6px;
+    padding: 7px 10px;
+    color: #ccc;
+    font-size: 12px;
+    width: 100%;
+    box-sizing: border-box;
+}
+
+.yt-input:focus {
+    outline: none;
+    border-color: #22c55e;
+}
+
+.yt-input--sm {
+    padding: 4px 8px;
+    font-size: 11px;
+}
+
+/* ── 셀렉트 ── */
+.yt-select {
+    flex: 1;
+    background: #1f2937;
+    border: 1px solid #374151;
+    border-radius: 6px;
+    padding: 8px 10px;
+    color: #9ca3af;
+    font-size: 12px;
+}
+
+/* ── 형식 토글 ── */
+.yt-format-toggle {
+    display: flex;
+    gap: 4px;
+}
+
+.yt-format-btn {
+    background: #1f2937;
+    border: 1px solid #374151;
+    border-radius: 6px;
+    padding: 8px 10px;
+    color: #9ca3af;
+    font-size: 11px;
+    cursor: pointer;
+    white-space: nowrap;
+}
+
+.yt-format-btn.is-active {
+    background: #1a2e1a;
+    border-color: #22c55e;
+    color: #86efac;
+}
+
+/* ── 국가 칩 ── */
+.yt-country-label {
+    font-size: 11px;
+    color: #6b7280;
+    margin-bottom: 6px;
+}
+
+.yt-country-chips {
+    display: flex;
+    gap: 6px;
+    flex-wrap: wrap;
+    margin-bottom: 10px;
+}
+
+.yt-chip {
+    background: #1f2937;
+    border: 1px solid #374151;
+    border-radius: 4px;
+    padding: 3px 10px;
+    color: #6b7280;
+    font-size: 11px;
+    cursor: pointer;
+    transition: all 0.15s;
+}
+
+.yt-chip.is-active {
+    background: #1e3a2a;
+    border-color: #22c55e;
+    color: #86efac;
+}
+
+/* ── 생성 버튼 ── */
+.yt-create-btn {
+    width: 100%;
+    margin-top: 2px;
+}
+
+/* ── 프로젝트 목록 ── */
+.yt-project-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.yt-project-card {
+    background: #1f2937;
+    border-radius: 8px;
+    padding: 10px 12px;
+    display: flex;
+    align-items: center;
+    gap: 10px;
+}
+
+.yt-project-card__icon {
+    width: 40px;
+    height: 40px;
+    background: #111827;
+    border-radius: 6px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 18px;
+    flex-shrink: 0;
+}
+
+.yt-project-card__info { flex: 1; min-width: 0; }
+
+.yt-project-card__title {
+    font-size: 12px;
+    font-weight: 600;
+    color: #ccc;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.yt-project-card__meta {
+    font-size: 10px;
+    color: #6b7280;
+    margin-top: 2px;
+}
+
+/* ── 상태 배지 ── */
+.yt-status {
+    font-size: 10px;
+    padding: 2px 8px;
+    border-radius: 4px;
+    white-space: nowrap;
+    flex-shrink: 0;
+}
+
+.yt-status--pending   { background: #1f2937; color: #9ca3af; }
+.yt-status--rendering { background: #1a1500; color: #f59e0b; }
+.yt-status--done      { background: #0a3d1a; color: #22c55e; }
+.yt-status--failed    { background: #2d0a0a; color: #f87171; }
+
+/* ── 진행 바 ── */
+.yt-progress-bar {
+    height: 3px;
+    background: #374151;
+    border-radius: 2px;
+    margin-top: 6px;
+    overflow: hidden;
+}
+
+.yt-progress-bar__fill {
+    height: 100%;
+    width: 65%;
+    background: linear-gradient(90deg, #f59e0b, #fbbf24);
+    border-radius: 2px;
+    animation: yt-progress-pulse 2s ease-in-out infinite;
+}
+
+@keyframes yt-progress-pulse {
+    0%, 100% { opacity: 1; }
+    50% { opacity: 0.6; }
+}
+
+/* ── 내보내기 ── */
+.yt-export-links {
+    display: flex;
+    gap: 8px;
+    flex-wrap: wrap;
+    margin-bottom: 10px;
+}
+
+.yt-meta-preview {
+    background: #111827;
+    border-radius: 6px;
+    padding: 8px;
+}
+
+.yt-meta-preview__label {
+    font-size: 10px;
+    color: #6b7280;
+    margin-bottom: 4px;
+}
+
+.yt-meta-preview__content {
+    font-size: 11px;
+    color: #9ca3af;
+    font-family: monospace;
+    margin: 0;
+    white-space: pre-wrap;
+    word-break: break-all;
+}
+
+/* ── 빈 상태 ── */
+.yt-empty {
+    text-align: center;
+    color: #6b7280;
+    font-size: 11px;
+    padding: 8px 0;
+    margin: 0;
+}
+
+/* ── 대시보드 카드 ── */
+.yt-dash-cards {
+    display: grid;
+    grid-template-columns: 1fr 1fr 1fr;
+    gap: 10px;
+}
+
+.yt-dash-card {
+    background: #0d1117;
+    border: 1px solid #1f2937;
+    border-radius: 8px;
+    padding: 12px;
+    text-align: center;
+}
+
+.yt-dash-card__label { font-size: 10px; color: #6b7280; margin-bottom: 4px; }
+.yt-dash-card__sub   { font-size: 9px;  color: #6b7280; margin-top: 2px; }
+
+.yt-dash-card__value         { font-size: 18px; font-weight: 700; }
+.yt-dash-card__value--green  { color: #22c55e; }
+.yt-dash-card__value--blue   { color: #60a5fa; }
+.yt-dash-card__value--amber  { color: #f59e0b; }
+
+/* ── 바 차트 ── */
+.yt-bar-chart {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.yt-bar-row {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+.yt-bar-row__label {
+    width: 80px;
+    font-size: 11px;
+    color: #9ca3af;
+    text-align: right;
+    flex-shrink: 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.yt-bar-row__rank {
+    width: 24px;
+    font-size: 11px;
+    font-weight: 700;
+    color: #f59e0b;
+    text-align: center;
+    flex-shrink: 0;
+}
+
+.yt-bar-row__info { flex: 1; }
+
+.yt-bar-row__genre-header {
+    display: flex;
+    justify-content: space-between;
+    margin-bottom: 3px;
+}
+
+.yt-bar-row__genre-name { font-size: 12px; color: #ccc; }
+.yt-bar-row__flags      { font-size: 10px; color: #9ca3af; }
+
+.yt-bar-row__track {
+    flex: 1;
+    height: 6px;
+    background: #1f2937;
+    border-radius: 3px;
+    overflow: hidden;
+}
+
+.yt-bar-row__fill {
+    height: 100%;
+    background: linear-gradient(90deg, #22c55e, #4ade80);
+    border-radius: 3px;
+    transition: width 0.4s ease;
+}
+
+.yt-bar-row__fill--genre {
+    background: linear-gradient(90deg, #f59e0b, #fbbf24);
+}
+
+.yt-bar-row__value {
+    width: 44px;
+    font-size: 11px;
+    color: #22c55e;
+    text-align: right;
+    flex-shrink: 0;
+}
+
+/* ── 테이블 ── */
+.yt-table { display: flex; flex-direction: column; gap: 2px; }
+
+.yt-table__header {
+    display: grid;
+    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 28px;
+    gap: 4px;
+    padding: 0 4px 6px;
+    border-bottom: 1px solid #1f2937;
+    font-size: 10px;
+    color: #6b7280;
+}
+
+.yt-table__row {
+    display: grid;
+    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 28px;
+    gap: 4px;
+    padding: 7px 4px;
+    border-bottom: 1px solid #111827;
+    align-items: center;
+}
+
+.yt-table__row--editing {
+    background: #111827;
+    border-radius: 6px;
+    padding: 8px;
+}
+
+.yt-table__row:last-child { border-bottom: none; }
+
+.yt-table__cell         { font-size: 11px; color: #9ca3af; }
+.yt-table__cell--mono   { font-family: monospace; }
+.yt-table__cell--green  { color: #22c55e; }
+.yt-table__cell--amber  { color: #f59e0b; }
+
+.yt-table__actions {
+    display: flex;
+    gap: 4px;
+    grid-column: span 2;
+}
+
+/* ── 상태 바 (트렌드) ── */
+.yt-status-bar {
+    background: #0d1117;
+    border: 1px solid #1f2937;
+    border-radius: 8px;
+    padding: 10px 14px;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+}
+
+.yt-status-bar__left {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+.yt-status-dot {
+    width: 8px;
+    height: 8px;
+    border-radius: 50%;
+    background: #22c55e;
+    box-shadow: 0 0 6px #22c55e;
+    flex-shrink: 0;
+}
+
+.yt-status-bar__text {
+    font-size: 11px;
+    color: #9ca3af;
+}
+
+/* ── 프롬프트 카드 ── */
+.yt-prompt-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.yt-prompt-card {
+    background: #1a0d2e;
+    border-radius: 8px;
+    padding: 10px 12px;
+}
+
+.yt-prompt-card__header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 5px;
+}
+
+.yt-prompt-card__genre    { font-size: 11px; font-weight: 700; color: #c084fc; }
+.yt-prompt-card__countries { font-size: 10px; color: #6b7280; }
+
+.yt-prompt-card__text {
+    display: block;
+    width: 100%;
+    text-align: left;
+    background: #110820;
+    border: none;
+    border-radius: 4px;
+    padding: 6px 8px;
+    font-size: 11px;
+    font-family: monospace;
+    color: #e9d5ff;
+    line-height: 1.6;
+    cursor: pointer;
+    transition: background 0.15s;
+}
+
+.yt-prompt-card__text:hover { background: #1a0d30; }
+
+.yt-prompt-card__copied {
+    font-size: 10px;
+    color: #22c55e;
+    margin-top: 4px;
+    display: block;
+}
+
+.yt-prompt-card__reason {
+    font-size: 10px;
+    color: #6b7280;
+    margin-top: 5px;
+}
+
+/* ── 리포트 이력 ── */
+.yt-report-list {
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+}
+
+.yt-report-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 6px 8px;
+    border-radius: 6px;
+    cursor: pointer;
+    transition: background 0.15s;
+}
+
+.yt-report-row:hover      { background: #1f2937; }
+.yt-report-row.is-selected { background: #1f2937; }
+
+.yt-report-row__date {
+    font-size: 11px;
+    color: #ccc;
+}
+
+.yt-report-row__today {
+    font-size: 10px;
+    color: #22c55e;
+    margin-left: 4px;
+}
+
+.yt-report-row__meta   { font-size: 10px; color: #9ca3af; }
+.yt-report-row__action { font-size: 11px; color: #60a5fa; }
+
+/* ── 모바일 반응형 ── */
+@media (max-width: 600px) {
+    .yt-dash-cards         { grid-template-columns: 1fr 1fr; }
+    .yt-form-grid          { grid-template-columns: 1fr; }
+    .yt-table__header,
+    .yt-table__row         { grid-template-columns: 2fr 1fr 1fr 28px; }
+    .yt-table__header span:nth-child(4),
+    .yt-table__header span:nth-child(5),
+    .yt-table__row span:nth-child(4),
+    .yt-table__row span:nth-child(5) { display: none; }
+}
+```
+
+- [ ] **Step 12: 커밋**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git add src/pages/music/MusicStudio.jsx src/pages/music/MusicStudio.css
+git commit -m "feat(youtube-tab): MusicStudio YouTube 탭 연결 + CSS + Library 버튼"
+```
+
+---
+
+## Task 7: 브라우저 통합 검증
+
+**작업 위치:** `/Users/jaeohpark/development/web-page/`
+
+- [ ] **Step 1: dev 서버 시작 (이미 실행 중이면 스킵)**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+npm run dev
+```
+
+- [ ] **Step 2: 브라우저에서 `http://localhost:5173` (또는 출력된 포트) 열기**
+
+- [ ] **Step 3: Music 페이지 → YouTube 탭 버튼 클릭 확인**
+
+Expected:
+- 탭 바에 `🎯 YouTube` 버튼이 보임
+- 클릭 시 3개 서브탭(`🎬 영상 제작 / 💰 수익 추적 / 📊 시장 트렌드`) 표시
+- 콘솔 에러 없음
+
+- [ ] **Step 4: 영상 제작 서브탭 확인**
+
+- 트랙 드롭다운에 Library 트랙 목록 표시 (Library에 트랙이 있는 경우)
+- 국가 칩 BR/US/ID/MX/KR 클릭 토글 동작
+- 비주얼라이저/슬라이드쇼 토글 동작
+- "프로젝트 생성" 버튼 클릭 → 트랙 미선택 시 비활성화 확인
+
+- [ ] **Step 5: 수익 추적 서브탭 확인**
+
+- 대시보드 카드 3개 표시 (데이터 없으면 `—` 표시)
+- 수익 추가 폼에 YouTube ID / 월 / 수익 / 조회수 / 국가 입력 후 저장
+- 저장 후 테이블에 레코드 표시, 대시보드 수치 갱신
+
+- [ ] **Step 6: 시장 트렌드 서브탭 확인**
+
+- 수집 상태 바 표시 (마지막 수집 일시)
+- 장르 Top 5 바 차트 표시 (데이터 있는 경우)
+- Suno 프롬프트 클릭 → 클립보드 복사 + "✓ 복사됨" 메시지
+- 리포트 이력 클릭 → 해당 날짜 데이터로 Top 5 갱신
+
+- [ ] **Step 7: Library 탭 → 트랙 카드 `•••` → `🎯 YouTube 프로젝트` 버튼 확인**
+
+Expected: 클릭 시 YouTube 탭으로 이동, 해당 트랙이 드롭다운에 pre-select됨
+
+- [ ] **Step 8: 최종 커밋 및 PR 준비**
+
+```bash
+cd /Users/jaeohpark/development/web-page
+git log --oneline feat/music-youtube-tab ^main
+```
+
+Expected: Task 1~6에서 만든 커밋 6개 표시.
+
+```bash
+git push -u origin feat/music-youtube-tab
+```