:root{font-family:Segoe UI,Helvetica Neue,Arial,sans-serif;color:#111;background:#f6f7fb}body{margin:0}.app{max-width:760px;margin:40px auto;padding:20px;background:#fff;border:1px solid #ddd;border-radius:12px}.actions{display:flex;gap:10px;margin:16px 0}button{padding:10px 14px;border-radius:8px;border:1px solid #222;background:#fff;cursor:pointer}