.qb-sticky[data-astro-cid-gqf47fqe]{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line);backdrop-filter:blur(6px)}.qb-sticky-in[data-astro-cid-gqf47fqe]{max-width:var(--maxw);margin:0 auto;padding:10px var(--pad);display:flex;align-items:center;gap:14px}.qb-sticky-title[data-astro-cid-gqf47fqe]{display:block;font-size:14px}.qb-sticky-count[data-astro-cid-gqf47fqe]{display:block;font:500 11.5px var(--font-body);color:var(--soft)}.qb-sticky-lesson[data-astro-cid-gqf47fqe]{flex:none;font:600 12.5px var(--font-display);color:var(--qb-accent, var(--acc));white-space:nowrap}.qb-source[data-astro-cid-gqf47fqe]{font:500 12.5px var(--font-body);color:var(--faint);margin:0 0 16px;max-width:640px;line-height:1.55}.qb-hint[data-astro-cid-gqf47fqe][hidden]{display:none}.qb-hint[data-astro-cid-gqf47fqe]{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--acc-bg);border:1px solid #F1DFBC;border-radius:14px;padding:12px 16px;margin:0 0 16px;max-width:760px}.qb-hint-text[data-astro-cid-gqf47fqe]{font:500 13px var(--font-body);color:var(--acc-ink);line-height:1.5}.qb-hint-dismiss[data-astro-cid-gqf47fqe]{flex:none;border:none;background:none;cursor:pointer;font:700 13px var(--font-body);color:var(--acc-ink);opacity:.65;padding:4px;line-height:1}.qb-hint-dismiss[data-astro-cid-gqf47fqe]:hover{opacity:1}.qb-list[data-astro-cid-gqf47fqe]{display:flex;flex-direction:column;gap:12px;max-width:760px}.qb-q[data-astro-cid-gqf47fqe]{border:1px solid var(--line);border-radius:14px;background:var(--card);padding:16px}.qb-q-head[data-astro-cid-gqf47fqe]{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}.qb-q-n[data-astro-cid-gqf47fqe]{font:800 13px var(--font-mono, ui-monospace, monospace)}.qb-q-badges[data-astro-cid-gqf47fqe]{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.qb-q-marks[data-astro-cid-gqf47fqe]{font:700 11px var(--font-display);border-radius:999px;padding:3px 9px}.qb-q-type[data-astro-cid-gqf47fqe],.qb-q-page[data-astro-cid-gqf47fqe]{font:600 11px var(--font-mono, ui-monospace, monospace);color:var(--faint);border:1px solid var(--line);border-radius:999px;padding:3px 9px}.qb-q-text[data-astro-cid-gqf47fqe]{font:500 15px var(--font-body);color:var(--ink);line-height:1.55;white-space:pre-line}.qb-q-line[data-astro-cid-gqf47fqe]{display:block}.qb-fig[data-astro-cid-gqf47fqe]{display:block;background:var(--line2);color:var(--faint);border-radius:8px;padding:6px 10px;margin:6px 0;font:500 13px var(--font-body);font-style:italic}.qb-opts[data-astro-cid-gqf47fqe]{list-style:none;padding-left:0;margin:12px 0 0}.qb-opts[data-astro-cid-gqf47fqe] li[data-astro-cid-gqf47fqe]{margin-bottom:5px}.qb-opt[data-astro-cid-gqf47fqe]{display:block;width:100%;text-align:left;font:500 14.5px var(--font-body);color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:10px;padding:9px 13px;cursor:pointer;transition:border-color .15s ease,background-color .15s ease}@media(hover:hover)and (pointer:fine){.qb-opt[data-astro-cid-gqf47fqe]:hover{border-color:var(--qb-accent, var(--acc))}}.qb-opt[data-astro-cid-gqf47fqe][aria-pressed=true]{border-color:var(--qb-accent, var(--acc));background:var(--line2);font-weight:600}.qb-attempt-btn{font:600 12.5px var(--font-display);border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:7px 14px;cursor:pointer;margin:14px 0 0;transition:border-color .15s,background .15s}.qb-attempt-btn:disabled{opacity:.55;cursor:default}.qb-reveal[data-astro-cid-gqf47fqe]{margin-top:14px;border-top:1px dashed var(--line);padding-top:12px}.qb-reveal-sum[data-astro-cid-gqf47fqe]{list-style:none;cursor:pointer;font:600 12.5px var(--font-display);color:var(--qb-accent, var(--acc))}.qb-reveal-sum[data-astro-cid-gqf47fqe]::-webkit-details-marker{display:none}.qb-reveal[data-astro-cid-gqf47fqe].qb-locked .qb-reveal-sum[data-astro-cid-gqf47fqe]{color:var(--faint);cursor:not-allowed}.qb-lock-hint{display:block;margin-top:4px;font:500 12px var(--font-body);color:var(--faint);cursor:default}.qb-answer[data-astro-cid-gqf47fqe]{margin-top:10px}.qb-answer-line[data-astro-cid-gqf47fqe]{margin:0 0 8px;line-height:1.6;font-size:14px;color:var(--ink);max-width:64ch}.qb-answer-line[data-astro-cid-gqf47fqe]:last-child{margin-bottom:0}.qb-noanswer[data-astro-cid-gqf47fqe]{margin:14px 0 0;padding-top:12px;border-top:1px dashed var(--line);font:500 13px var(--font-body);color:var(--faint);font-style:italic}.qb-ai-slot[data-astro-cid-gqf47fqe]:empty{display:none}.qb-ai-slot[data-astro-cid-gqf47fqe]{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line)}.qb-ai-actions{display:flex;flex-wrap:wrap;gap:8px}.qb-ai-btn{font:600 12.5px var(--font-display);border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:7px 14px;cursor:pointer;transition:border-color .15s,background .15s}.qb-ai-btn:hover:not(:disabled){border-color:var(--qb-accent, var(--acc))}.qb-ai-btn:disabled{opacity:.55;cursor:default}.qb-ai-explain{border-color:var(--qb-accent, var(--acc));color:var(--qb-accent, var(--acc))}.qb-check-nudge{margin-top:8px}.qb-check-nudge[hidden]{display:none}.qb-check-box{display:flex;flex-direction:column;gap:8px;margin-top:10px}.qb-check-box[hidden]{display:none}.qb-check-hint{font:500 12.5px var(--font-body);color:var(--faint);line-height:1.5;margin:0}.qb-check-input{font:500 13.5px var(--font-body);color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px;min-height:76px;resize:vertical;line-height:1.5}.qb-check-submit{align-self:flex-start}.qb-ai-panel{margin-top:12px;background:var(--line2);border-radius:var(--radius-sm);padding:14px 16px}.qb-ai-panel[hidden]{display:none}.qb-ai-head{font:700 11.5px var(--font-display);letter-spacing:.06em;text-transform:uppercase;color:var(--qb-accent, var(--acc));margin-bottom:8px}.qb-ai-body{font:500 14px var(--font-body);color:var(--ink);line-height:1.6}.qb-ai-h{font:700 13.5px var(--font-display);color:var(--ink);margin:12px 0 6px}.qb-ai-h:first-child{margin-top:0}.qb-ai-p{margin:0 0 8px;line-height:1.6}.qb-ai-p:last-child{margin-bottom:0}.qb-ai-note{margin:10px 0 0;padding:8px 12px;background:var(--acc-bg);border:1px solid #F1DFBC;border-radius:8px;font:600 12px var(--font-body);color:var(--acc-ink)}.qb-ai-thinking{font:500 13px var(--font-body);color:var(--faint);font-style:italic}.qb-ai-error{font:500 13px var(--font-body);color:var(--bad);background:var(--bad-bg);border-radius:8px;padding:8px 12px}