.exercise-heading{max-width:920px}.exercise-summary{flex-wrap:wrap;gap:10px;margin-top:22px;display:flex}.exercise-summary span{border:1px solid var(--line);color:var(--muted);background:var(--panel);border-radius:999px;padding:9px 12px;font-size:.8rem}.exercise-summary strong{color:var(--ink)}.exercise-library{grid-template-columns:260px minmax(0,1fr);align-items:start;gap:22px;display:grid}.exercise-controls{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);gap:20px;padding:18px;display:grid;position:sticky;top:92px}.exercise-controls label,.exercise-controls>div{gap:8px;display:grid}.exercise-controls label>span,.exercise-controls>div>span{color:var(--muted);font-size:.75rem;font-weight:750}.exercise-controls select{border:1px solid var(--line);width:100%;min-height:44px;color:var(--ink);font:inherit;background:#fff;border-radius:10px;padding:0 10px}.exercise-skill-tabs{gap:6px;display:grid}.exercise-skill-tabs button,.review-filter{border:1px solid var(--line);min-height:40px;color:var(--muted);font:inherit;text-align:left;cursor:pointer;background:#fafcfb;border-radius:10px;padding:8px 10px}.exercise-skill-tabs button.active,.review-filter.active{color:var(--brand-dark);border-color:var(--brand);background:var(--brand-soft)}.review-filter{justify-content:space-between;gap:10px;display:flex}.review-filter strong{color:var(--brand-dark)}.exercise-workspace{gap:16px;min-width:0;display:grid}.exercise-workspace>header{padding:4px 0 8px}.exercise-workspace>header h2{margin:0;font-size:1.65rem}.exercise-workspace>header p{color:var(--muted);margin:7px 0 0}.empty-state{border:1px dashed var(--line);border-radius:var(--radius);background:var(--panel);padding:34px}.empty-state h3{margin-top:0}.empty-state p{color:var(--muted);margin-bottom:0}@media (max-width:860px){.exercise-library{grid-template-columns:1fr}.exercise-controls{position:static}.exercise-skill-tabs{grid-template-columns:repeat(3,1fr)}}@media (max-width:520px){.exercise-skill-tabs{grid-template-columns:1fr 1fr}}