body{font-family:system-ui,sans-serif;max-width:800px;margin:40px auto;line-height:1.6;color:#333;background:#f9f9f9}h1,h2{color:#111}.tool{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px rgba(0,0,0,.1);margin-bottom:20px}pre{background:#222;color:#fff;padding:15px;border-radius:5px;overflow-x:auto}