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var(--border2);width:24px;height:24px;color:var(--muted);cursor:pointer;background:#0a0e15bf;border-radius:6px;place-items:center;display:grid;position:absolute;top:6px;right:6px}.demo-stats{flex-wrap:wrap;gap:6px;padding:0 8px 8px;display:flex}.demo-stat{background:var(--bg2);border:1px solid var(--border);border-radius:8px;flex:1;min-width:78px;padding:5px 9px}.demo-stat small{letter-spacing:.08em;text-transform:uppercase;color:var(--faint);font-size:9.5px;font-weight:700;display:block}.demo-stat b{font-family:var(--mono);font-size:14px}.demo-note{border-left:3px solid var(--accent);color:#d6dfeb;background:#f5a52412;border-radius:8px;margin:0 8px 8px;padding:8px 11px;font-size:12.5px;line-height:1.5}.widget{background:var(--panel);border:1px solid var(--border2);border-radius:12px;padding:12px}.widget canvas{display:block}.widget-out{color:#c9d4e3;background:var(--bg2);border-radius:8px;margin-top:10px;padding:8px 10px;font-size:13px}@media (width<=860px){.lesson-grid{grid-template-columns:1fr}}.solution-grid{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);align-items:start;gap:24px;display:grid}.solution-side{position:sticky;top:0}.sol-section{font-family:var(--display);letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:20px 0 8px;font-size:12px;font-weight:700}.sol-section:first-child{margin-top:0}.choice{border:1px solid var(--border);background:var(--bg2);border-radius:10px;margin-bottom:8px;padding:10px 13px}.choice .md{font-size:13.2px;line-height:1.55}.choice .md p{margin:5px 0 0}.choice-h{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.choice-h b{font-size:13.5px}.choice.whynot{border-left:3px solid var(--bad)}.missed{color:#fda4af;flex-direction:column;gap:2px;margin-top:6px;font-size:12px;display:flex}.measure{border:1px solid var(--border);border-radius:10px;overflow:hidden}.measure-row{border-top:1px solid var(--border);grid-template-columns:minmax(0,1.4fr) 1.1fr .5fr 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