body{color:#111;background:#fff;margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:#0645ad;text-decoration:none}a:hover{text-decoration:underline}header{border-bottom:1px solid #ddd;justify-content:space-between;align-items:center;padding:8px 16px;display:flex}main{max-width:900px;padding:24px}pre{background:#f6f8fa;padding:12px;overflow-x:auto}