:root{--bg:#f7f7f7;--fg:#111;--muted:#666;--card:#fff;--border:#e6e6e6}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--fg);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,"Apple Color Emoji","Segoe UI Emoji"}button{cursor:pointer}input,button,textarea{font-family:inherit;font-size:14px}code{background:#f3f3f3;padding:2px 6px;border-radius:6px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px}