:root{--bg:#f5f5f5;--panel:#ffffff;--border:#edebe9;--text:#201f1e;--muted:#605e5c;--accent:#2563eb}*{box-sizing:border-box}body,html{margin:0;min-height:100%;font-family:Segoe UI,system-ui,sans-serif;color:var(--text);background:var(--bg)}button{font:inherit;cursor:pointer}textarea{font:13px/1.45 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}