diff --git a/.gitignore b/.gitignore
index eb17b4a..4ba6711 100644
--- a/.gitignore
+++ b/.gitignore
@@ -199,9 +199,3 @@ zhihu-articles/
 
 # Results directory (test outputs, charts, etc.)
 results/
-
-# Node.js (local testing only)
-node_modules/
-package.json
-package-lock.json
-rotation/test_screenshot.mjs
diff --git a/rotation/backtest_viewer.html b/rotation/backtest_viewer.html
index 6a9bd88..a7a77e3 100644
--- a/rotation/backtest_viewer.html
+++ b/rotation/backtest_viewer.html
@@ -152,15 +152,11 @@ tr.below-threshold { color: #484f58; }
 </div>
 
 <script>
-// Use window. to allow external access (for Playwright screenshot injection)
-window.DATA = null;
-window.currentIdx = 0;
-window.playing = false;
-window.playTimer = null;
-window.rebalanceDays = [];
-
-// Convenience aliases for script-internal use
-const DATA_PROXY = { get data() { return window.DATA; }, set data(v) { window.DATA = v; } };
+let DATA = null;
+let currentIdx = 0;
+let playing = false;
+let playTimer = null;
+let rebalanceDays = [];
 
 const $ = id => document.getElementById(id);
 
diff --git a/rotation/html_report.py b/rotation/html_report.py
deleted file mode 100644
index 3992e08..0000000
--- a/rotation/html_report.py
+++ /dev/null
@@ -1,285 +0,0 @@
-"""
-HTML Report Screenshot Generator
-
-Uses Playwright to render backtest_viewer.html in headless Chromium
-and capture a full-page screenshot as PNG.
-
-Intended to be called after export_results() has produced simple_rotation_detail.json.
-"""
-
-import json
-from pathlib import Path
-from typing import Optional, List, Dict
-import numpy as np
-
-
-def compute_monthly_returns(daily_records: List[Dict]) -> List[Dict]:
-    """Compute monthly cumulative returns from daily_records.
-
-    Returns list of {year, month, return_pct, trading_days} dicts.
-    """
-    if not daily_records:
-        return []
-
-    # Group by (year, month)
-    monthly: Dict[str, List[float]] = {}
-    for rec in daily_records:
-        date_str = rec['date']
-        ym = date_str[:7]  # "2024-01"
-        if ym not in monthly:
-            monthly[ym] = []
-        monthly[ym].append(rec['nav'])
-
-    results = []
-    for ym in sorted(monthly.keys()):
-        navs = monthly[ym]
-        if len(navs) < 1:
-            continue
-        # Monthly return = last_nav / prev_last_nav - 1
-        # prev_last_nav = last nav of previous month, or first nav of this month's start
-        # More accurate: use the nav just before the first day of this month
-        results.append({
-            'year_month': ym,
-            'start_nav': navs[0],
-            'end_nav': navs[-1],
-            'trading_days': len(navs),
-        })
-
-    # Compute returns sequentially
-    for i, r in enumerate(results):
-        if i == 0:
-            # First month: return relative to first NAV (which is usually ~1.0)
-            # Use previous day's nav if available, otherwise start_nav itself
-            r['return_pct'] = 0.0  # first month baseline
-        else:
-            r['return_pct'] = r['start_nav'] / results[i-1]['end_nav'] - 1
-        r['month_return'] = r['end_nav'] / r['start_nav'] - 1
-
-    return results
-
-
-def generate_html_screenshot(
-    detail_json_path: str,
-    output_path: str,
-    target_date: Optional[str] = None,
-    viewport_width: int = 1920,
-    viewport_height: int = 1080,
-    show_monthly_table: bool = True,
-    daily_records: Optional[List[Dict]] = None,
-):
-    """Render backtest_viewer.html and capture screenshot.
-
-    Args:
-        detail_json_path: Path to simple_rotation_detail.json
-        output_path: Output PNG path
-        target_date: Date string to navigate to (YYYY-MM-DD). None = last day.
-        viewport_width: Browser viewport width
-        viewport_height: Browser viewport height (minimum, will expand for full page)
-        show_monthly_table: Whether to inject monthly returns table
-        daily_records: List of daily record dicts (needed for monthly table)
-    """
-    try:
-        from playwright.sync_api import sync_playwright
-    except ImportError:
-        print("  x Playwright not installed. Run: pip install playwright && playwright install chromium")
-        return
-
-    detail_path = Path(detail_json_path)
-    if not detail_path.exists():
-        print(f"  x Detail JSON not found: {detail_json_path}")
-        return
-
-    output = Path(output_path)
-    output.parent.mkdir(parents=True, exist_ok=True)
-
-    html_path = Path(__file__).parent / 'backtest_viewer.html'
-    if not html_path.exists():
-        print(f"  x backtest_viewer.html not found: {html_path}")
-        return
-
-    with open(detail_path, 'r', encoding='utf-8') as f:
-        detail_data = json.load(f)
-
-    print(f"  Launching headless Chromium...")
-
-    with sync_playwright() as p:
-        browser = p.chromium.launch(headless=True)
-        page = browser.new_page(viewport={'width': viewport_width, 'height': viewport_height})
-
-        # Load the HTML file
-        page.goto(f'file://{html_path.absolute()}')
-        page.wait_for_selector('#loader')
-
-        # Inject data directly (skip file input)
-        page.evaluate(f"""
-            (data) => {{
-                DATA = data;
-                document.getElementById('loader').style.display = 'none';
-                document.getElementById('app').classList.add('active');
-
-                // Build rebalance day index
-                rebalanceDays = [];
-                DATA.days.forEach((d, i) => {{ if (d.is_rebalance) rebalanceDays.push(i); }});
-
-                // Set date picker range
-                document.getElementById('date-picker').min = DATA.days[0].date;
-                document.getElementById('date-picker').max = DATA.days[DATA.days.length - 1].date;
-            }}
-        """, detail_data)
-
-        # Navigate to target date
-        if target_date:
-            page.evaluate(f"""
-                (targetDate) => {{
-                    const idx = DATA.days.findIndex(d => d.date === targetDate);
-                    if (idx >= 0) {{
-                        currentIdx = idx;
-                        render(currentIdx);
-                        drawChart();
-                        drawChartMarker();
-                    }}
-                }}
-            """, target_date)
-        else:
-            # Navigate to last day
-            page.evaluate("""
-                () => {
-                    currentIdx = DATA.days.length - 1;
-                    render(currentIdx);
-                    drawChart();
-                    drawChartMarker();
-                }
-            """)
-
-        # Wait for rendering
-        page.wait_for_timeout(500)
-
-        # Inject monthly returns table if requested
-        if show_monthly_table and daily_records:
-            monthly = compute_monthly_returns(daily_records)
-            if monthly:
-                _inject_monthly_table(page, monthly)
-                page.wait_for_timeout(300)
-
-        # Take full page screenshot
-        page.screenshot(path=str(output), full_page=True)
-        browser.close()
-
-    print(f"  + HTML Report Screenshot: {output}")
-
-
-def _inject_monthly_table(page, monthly_data: List[Dict]):
-    """Inject monthly returns table into the page."""
-
-    # Build HTML for monthly table
-    rows_html = ""
-    for r in monthly_data:
-        ret = r['month_return']
-        cls = 'positive' if ret >= 0 else 'negative'
-        rows_html += f"""
-        <tr>
-            <td>{r['year_month']}</td>
-            <td style="color:{'#3fb950' if ret >= 0 else '#da3633'};font-weight:600">
-                {(ret * 100):+.2f}%
-            </td>
-            <td>{r['end_nav']:.4f}</td>
-            <td>{r['trading_days']}</td>
-        </tr>
-        """
-
-    # Also compute yearly returns
-    yearly: Dict[str, float] = {}
-    yearly_navs: Dict[str, float] = {}  # last nav of each year
-    for r in monthly_data:
-        year = r['year_month'][:4]
-        yearly[year] = r['end_nav']
-    yearly_list = sorted(yearly.keys())
-    yearly_rows = ""
-    for i, year in enumerate(yearly_list):
-        if i == 0:
-            yr_ret = 0.0
-        else:
-            prev_year = yearly_list[i-1]
-            yr_ret = yearly[year] / yearly[prev_year] - 1
-        cls_color = '#3fb950' if yr_ret >= 0 else '#da3633'
-        yearly_rows += f"""
-        <tr>
-            <td>{year}</td>
-            <td style="color:{cls_color};font-weight:600">{(yr_ret * 100):+.2f}%</td>
-            <td>{yearly[year]:.4f}</td>
-        </tr>
-        """
-
-    html = f"""
-    <div id="monthly-panel" style="
-        padding: 16px;
-        background: #161b22;
-        border-top: 1px solid #30363d;
-    ">
-        <div style="display: flex; gap: 32px; align-items: flex-start;">
-            <div style="flex: 1;">
-                <h3 style="color:#8b949e;font-size:11px;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px;">
-                    月度累计收益
-                </h3>
-                <table style="width:100%;border-collapse:collapse;font-size:12px;font-family:monospace;">
-                    <thead>
-                        <tr style="background:#0d1117;">
-                            <th style="text-align:left;padding:6px 8px;color:#8b949e;border-bottom:1px solid #30363d;">月份</th>
-                            <th style="text-align:right;padding:6px 8px;color:#8b949e;border-bottom:1px solid #30363d;">月收益</th>
-                            <th style="text-align:right;padding:6px 8px;color:#8b949e;border-bottom:1px solid #30363d;">月末净值</th>
-                            <th style="text-align:right;padding:6px 8px;color:#8b949e;border-bottom:1px solid #30363d;">交易天数</th>
-                        </tr>
-                    </thead>
-                    <tbody>
-                        {rows_html}
-                    </tbody>
-                </table>
-            </div>
-            <div style="min-width: 240px;">
-                <h3 style="color:#8b949e;font-size:11px;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px;">
-                    年度收益
-                </h3>
-                <table style="width:100%;border-collapse:collapse;font-size:12px;font-family:monospace;">
-                    <thead>
-                        <tr style="background:#0d1117;">
-                            <th style="text-align:left;padding:6px 8px;color:#8b949e;border-bottom:1px solid #30363d;">年度</th>
-                            <th style="text-align:right;padding:6px 8px;color:#8b949e;border-bottom:1px solid #30363d;">年收益</th>
-                            <th style="text-align:right;padding:6px 8px;color:#8b949e;border-bottom:1px solid #30363d;">年末净值</th>
-                        </tr>
-                    </thead>
-                    <tbody>
-                        {yearly_rows}
-                    </tbody>
-                </table>
-            </div>
-        </div>
-    </div>
-    """
-
-    # Append to app container
-    page.evaluate(f"""
-        (htmlContent) => {{
-            const app = document.getElementById('app');
-            const div = document.createElement('div');
-            div.innerHTML = htmlContent;
-            app.appendChild(div);
-        }}
-    """, html)
-
-    # Apply row borders
-    page.evaluate("""
-        () => {
-            document.querySelectorAll('#monthly-panel td').forEach(td => {
-                td.style.borderBottom = '1px solid #21262d';
-                td.style.padding = '5px 8px';
-            });
-        }
-    """)
-
-
-if __name__ == "__main__":
-    # Test: run with existing detail JSON
-    import sys
-    detail = sys.argv[1] if len(sys.argv) > 1 else "rotation/results/simple_rotation_detail.json"
-    output = sys.argv[2] if len(sys.argv) > 2 else "rotation/results/simple_rotation_html_report.png"
-    generate_html_screenshot(detail, output)
diff --git a/rotation/simple_rotation.py b/rotation/simple_rotation.py
index 39c723b..81d500d 100644
--- a/rotation/simple_rotation.py
+++ b/rotation/simple_rotation.py
@@ -1418,37 +1418,6 @@ class SimpleRotationStrategy:
         plt.close()
         print(f"  + Report: {chart_path}")
 
-    def generate_html_report(self, output_dir: str = None, target_date: str = None):
-        """Generate HTML-based report screenshot using Playwright.
-
-        Renders backtest_viewer.html in headless Chromium and captures
-        the ranking table + monthly returns as a PNG.
-
-        Args:
-            output_dir: Directory to save the PNG (default: rotation/results)
-            target_date: Date to navigate to (YYYY-MM-DD). None = last day.
-        """
-        from rotation.html_report import generate_html_screenshot
-
-        if output_dir is None:
-            output_dir = Path(__file__).parent / 'results'
-        output_dir = Path(output_dir)
-        output_dir.mkdir(parents=True, exist_ok=True)
-
-        detail_path = output_dir / 'simple_rotation_detail.json'
-        if not detail_path.exists():
-            print(f"  x Detail JSON not found: {detail_path}")
-            print("    Run export_results() first.")
-            return
-
-        output_path = output_dir / 'simple_rotation_html_report.png'
-        generate_html_screenshot(
-            detail_json_path=str(detail_path),
-            output_path=str(output_path),
-            target_date=target_date,
-            daily_records=self.daily_records,
-        )
-
 
 # ============================================================
 # Entry point
@@ -1464,4 +1433,3 @@ if __name__ == "__main__":
     if result:
         strategy.export_results()
         strategy.generate_report()
-        strategy.generate_html_report()