.exercise{border:1px solid var(--line);border-radius:var(--r);background:var(--surface);margin-bottom:1rem;padding:1rem 1.2rem}.exercise .prose{font-size:1.02rem}.ex-head{flex-wrap:wrap;align-items:center;gap:.7rem;margin-bottom:.6rem;display:flex}.ex-n{background:var(--surface-3);border-radius:50%;place-items:center;width:1.6rem;height:1.6rem;font-size:.8rem;display:inline-grid}.ex-fold{border-top:1px solid var(--line);margin-top:.7rem;padding-top:.6rem}.ex-fold summary{color:var(--accent);font-size:.9rem;font-weight:550}.ex-fold[open] summary{margin-bottom:.5rem}