电商运营工作台

Build a single-page e-commerce operations workbench as one self-contained HTML file with inline CSS (no build step, no external requests). Layout: fixed 200px left sidebar with brand, five nav items (Overview, Products, Orders, Traffic, Tickets) and a user chip; top bar with page title, search input and avatar; main area with a 4-card KPI row (GMV ¥86,420 +12.4%, Orders 1,284 +5.1%, Conversion 3.2% -0.3%, Refund rate 1.8% +0.2%), a 14-day GMV bar chart (pure CSS bars, violet accent #7c3aed), a low-stock product table (5 rows: name, stock, price, status badge), and an after-sales ticket queue. Use a light neutral surface, 1px borders, rounded-2xl cards, system font, and violet as the only accent. All data is hardcoded mock data. Width 1208px.