.qp-band{position:relative;isolation:isolate;overflow:hidden;margin-bottom:24px;background:radial-gradient(520px 320px at 4% 0%,#e1f2f0,transparent 70%),radial-gradient(560px 360px at 96% 100%,#c5e6e380,transparent 70%),linear-gradient(118deg,#f7fbfa,#fff);box-shadow:inset 0 -1px 0 var(--color-divider)}.qp-band .breadcrumbs{background:transparent;border-bottom:0}.qp-hero{padding-top:8px;padding-bottom:28px}.qp-subject{display:inline-flex;align-items:center;gap:6px;padding:3px 10px 3px 8px;border-radius:var(--radius-pill);font-size:var(--text-xs);font-weight:700;letter-spacing:.02em;text-decoration:none;background:var(--subject-soft, var(--color-primary-soft));color:var(--subject, var(--color-primary))}.qp-subject:hover{color:var(--subject, var(--color-primary));text-decoration:underline}.qp-subject[data-subject=english],.qp-workspace[data-subject=english]{--subject: var(--subject-english);--subject-soft: var(--subject-english-soft)}.qp-subject[data-subject=math],.qp-workspace[data-subject=math]{--subject: var(--subject-math);--subject-soft: var(--subject-math-soft)}.qp-subject[data-subject=reading],.qp-workspace[data-subject=reading]{--subject: var(--subject-reading);--subject-soft: var(--subject-reading-soft)}.qp-subject[data-subject=science],.qp-workspace[data-subject=science]{--subject: var(--subject-science);--subject-soft: var(--subject-science-soft)}.qp-hero h1{font-size:clamp(1.9rem,1.4rem + 1.6vw,2.5rem);margin:12px 0 8px}.qp-lede{max-width:80ch;margin:0;color:var(--color-text-secondary)}.qp-facts{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px;font-size:var(--text-sm)}.qp-facts li{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;background:#ffffffc7;border:1px solid var(--color-border);border-radius:var(--radius-pill);color:var(--color-text-secondary)}.qp-facts .icon{color:var(--color-text-muted)}.qp-facts strong{color:var(--color-heading)}.qp-fact-how{background:var(--color-primary-soft)!important;border-color:var(--color-primary-line)!important;padding:0!important}.qp-fact-how a{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;font-weight:700;text-decoration:none}.qp-fact-how a .icon{color:currentColor}.qp-fact-how a:hover{text-decoration:underline}.qp-section{padding-bottom:48px}.qp-app{min-height:420px}.qp-loading{display:grid;place-items:center;align-content:center;gap:12px;min-height:360px;color:var(--color-text-muted);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg)}.qp-loading:before{content:"";width:28px;height:28px;border-radius:50%;border:3px solid var(--color-border);border-top-color:var(--color-primary);animation:spin .8s linear infinite}.qp-workspace{--subject: var(--color-primary);--subject-soft: var(--color-primary-soft);--passage-bg: color-mix(in srgb, var(--subject-soft) 45%, #fff);--passage-line: color-mix(in srgb, var(--subject-soft), var(--subject) 14%);display:grid;grid-template-columns:minmax(268px,300px) minmax(0,1fr);gap:20px;align-items:start}.qp-side{grid-column:1;grid-row:1;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:10px;padding:16px;background:linear-gradient(180deg,color-mix(in srgb,var(--subject-soft) 60%,#fff) 0,var(--color-surface) 120px);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow)}.qp-mini{grid-column:1;grid-row:1;min-width:0;font-size:var(--text-xs);font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--subject);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.qp-filter{grid-column:2;grid-row:1;position:relative}.qp-filter-btn{display:inline-flex;align-items:center;gap:6px;max-width:150px;min-height:36px;padding:4px 9px 4px 12px;background:var(--color-surface);color:var(--color-text);border:1.5px solid var(--color-border-strong);border-radius:var(--radius-sm);font-size:var(--text-sm);font-weight:600;cursor:pointer;transition:border-color .15s,box-shadow .15s}.qp-filter-btn>span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qp-filter-btn .icon{color:var(--color-text-muted);transition:transform .15s}.qp-filter-btn:hover{border-color:var(--gray-500)}.qp-filter-btn[aria-expanded=true]{border-color:var(--color-focus);box-shadow:0 0 0 3px var(--color-focus-ring)}.qp-filter-btn[aria-expanded=true] .icon{transform:rotate(180deg)}.qp-filter-btn.is-filtered{background:var(--color-primary-soft);border-color:var(--color-primary);color:var(--color-primary)}.qp-filter-list{position:absolute;top:calc(100% + 6px);right:0;z-index:6;min-width:100%;width:max-content;max-width:min(240px,calc(100vw - 32px));max-height:320px;overflow-y:auto;overscroll-behavior:contain;margin:0;padding:8px;list-style:none;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-lg)}.qp-filter-list:focus{outline:none}.qp-filter-list li{position:relative;margin:0;padding:6px 12px 6px 32px;border-radius:6px;font-size:var(--text-sm);font-weight:600;line-height:1.4;color:var(--color-text);white-space:nowrap;cursor:pointer}.qp-filter-list li.is-active{background:var(--color-surface-hover)}.qp-filter-list li[aria-selected=true]{color:var(--color-primary)}.qp-filter-list li[aria-selected=true]:before{content:"";position:absolute;left:10px;top:50%;width:14px;height:14px;translate:0 -50%;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232563eb' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7'/%3E%3C/svg%3E") center / contain no-repeat}.qp-filter-list li.is-divided{margin-bottom:4px;border-bottom-left-radius:0;border-bottom-right-radius:0;box-shadow:0 1px 0 var(--color-divider)}.qp-progress{grid-column:1 / -1;grid-row:2;margin:-4px 0 0;font-size:var(--text-xs);color:var(--color-text-muted)}.qp-search{grid-column:1 / -1;grid-row:3}.qp-search .input{min-height:40px;padding:7px 12px;font-size:var(--text-sm)}.qp-rows{grid-column:1 / -1;grid-row:4;display:flex;flex-direction:column;gap:2px;margin-inline:-8px}.qp-empty-rows{margin:0;padding:12px 8px;font-size:var(--text-sm);color:var(--color-text-muted)}.qp-row{display:flex;align-items:center;gap:12px;width:100%;min-height:52px;padding:8px 12px 8px 8px;text-align:left;font:inherit;color:var(--color-text);background:transparent;border:0;border-radius:var(--radius-sm);cursor:pointer}.qp-row:hover{background:var(--color-surface-hover)}.qp-row:focus-visible{outline-offset:-3px}.qp-row.is-current,.qp-row.is-current:hover{background:var(--color-primary-soft);box-shadow:inset 3px 0 0 var(--color-secondary)}.qp-row-num{flex:0 0 32px;height:32px;display:grid;place-items:center;border-radius:6px;background:var(--color-secondary-soft);color:var(--color-secondary);font-weight:700;font-size:var(--text-sm);font-variant-numeric:tabular-nums}.qp-row.is-current .qp-row-num{background:var(--color-secondary);color:#fff}.qp-row[data-state=done]:not(.is-current) .qp-row-num{background:var(--color-success-soft);color:var(--color-success)}.qp-row[data-state=done]:after{content:"";flex:none;margin-left:auto;width:16px;height:16px;border-radius:50%;background:var(--color-success) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7'/%3E%3C/svg%3E") center / 10px no-repeat}.qp-row[data-state=locked] .qp-row-num{background:var(--gray-100);color:var(--gray-500)}.qp-row[data-state=locked] .qp-row-copy strong{color:var(--color-text-secondary)}.qp-row-copy{min-width:0;display:grid;gap:1px}.qp-row-copy strong{font-size:var(--text-sm);font-weight:600;line-height:1.3;color:var(--color-heading);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.qp-row-copy span{font-size:var(--text-xs);line-height:1.4;color:var(--color-text-muted)}.qp-pages{grid-column:1 / -1;grid-row:5;display:flex;flex-wrap:wrap;justify-content:center;gap:2px;padding-top:12px;border-top:1px solid var(--color-divider)}.qp-pages:empty{display:none}.qp-pages button{min-width:30px;height:32px;padding:0 4px;background:var(--color-surface);color:var(--color-text-secondary);border:1px solid transparent;border-radius:6px;font-size:var(--text-sm);font-weight:700;font-variant-numeric:tabular-nums;cursor:pointer;transition:background .15s}.qp-pages button:first-child,.qp-pages button:last-child{font-size:1.25rem;line-height:1}.qp-pages button:hover:not(:disabled){background:var(--color-surface-hover);color:var(--color-text)}.qp-pages button[aria-current]{background:var(--color-secondary);border-color:var(--color-secondary);color:#fff}.qp-pages button:disabled{opacity:.4;cursor:default}.qp-player{grid-column:2;grid-row:1;position:relative;min-width:0;padding:clamp(16px,3vw,32px);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:clip}.qp-player:before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--subject)}.qp-note{grid-column:2;grid-row:2;margin:0;font-size:var(--text-xs);color:var(--color-text-muted)}.qp-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:16px}.qp-head-text{min-width:0}.qp-kicker{display:block;font-size:var(--text-xs);font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--subject);margin-bottom:4px}.qp-title{font-size:1.35rem;margin:0}.qp-title:focus{outline:none}.qp-badges{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end;margin-left:auto}.qp-badges:empty{display:none}.qp-save{display:inline-flex;align-items:center;gap:6px;flex:none;padding:4px 12px;border:1px solid var(--color-border-strong);border-radius:var(--radius-pill);background:var(--color-surface);color:var(--color-text-secondary);font:inherit;font-size:var(--text-sm);font-weight:600;cursor:pointer}.qp-save:hover{border-color:var(--color-text-secondary);color:var(--color-text)}.qp-save.is-on{color:var(--color-secondary);border-color:var(--color-secondary);background:var(--color-secondary-soft)}.qp-save.is-on .icon{fill:currentColor}.qp-stage{position:relative}.qp-passage{max-height:340px;overflow-y:auto;overscroll-behavior:contain;margin:0 0 20px;padding:12px 20px 14px 16px;font-size:var(--text-sm);line-height:1.65;color:var(--color-text);border:1px solid var(--passage-line);border-left:3px solid var(--subject);border-radius:var(--radius-sm);background:var(--passage-bg)}.qp-passage:focus-visible{outline-offset:2px}.qp-passage-short{max-height:none;overflow:visible;font-size:var(--text-base);line-height:1.75}.qp-passage p{margin:0 0 8px}.qp-passage p:last-child{margin-bottom:0}.qp-passage-intro{font-size:var(--text-xs);font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--color-text-muted)}.qp-passage-title{font-size:var(--text-lg);margin:0 0 10px}.qp-passage .passage-part{font-size:var(--text-base);margin:1.2em 0 .5em}.qp-passage .para-numbered{position:relative;padding-left:2.2em}.qp-passage .para-num{position:absolute;left:0;top:.15em;width:1.6em;height:1.6em;display:grid;place-items:center;border-radius:6px;background:var(--color-surface);border:1px solid var(--passage-line);font-size:.7rem;font-weight:700;color:var(--color-text-muted);line-height:1}.qp-passage .table-wrap{margin:10px 0}.qp-passage .data-table{background:var(--color-surface)}.qp-passage .figure{margin:10px 0}.qp-passage::-webkit-scrollbar{width:6px}.qp-passage::-webkit-scrollbar-track{background:transparent;margin-block:8px}.qp-passage::-webkit-scrollbar-thumb{background:color-mix(in srgb,var(--subject-soft),var(--subject) 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p:last-child{margin-bottom:0}.qp-question .table-wrap,.qp-question .figure{margin:12px 0;font-weight:400}.qp-question .data-table{width:auto;min-width:50%}.qp-choices{display:grid;gap:8px}.qp-choice{display:grid;grid-template-columns:auto auto 1fr;align-items:start;gap:12px;padding:12px 16px;border:1.5px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);cursor:pointer;transition:border-color .15s,background .15s}.qp-choice:hover{border-color:var(--color-border-strong);background:var(--color-surface-hover)}.qp-choice input{width:18px;height:18px;margin:.2rem 0 0;accent-color:var(--color-secondary)}.qp-choice:has(input:checked){border-color:var(--color-secondary);background:var(--blue-50)}.qp-choice:has(input:focus-visible){outline:3px solid var(--color-focus);outline-offset:2px}.qp-choice:has(input:disabled){cursor:default}.qp-choice:has(input:disabled):hover{border-color:var(--color-border);background:var(--color-surface)}.qp-choice:has(input:disabled:checked){border-color:var(--color-secondary);background:var(--blue-50)}.qp-key{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:6px;background:var(--color-surface-sunken);font-weight:800;font-size:var(--text-xs);color:var(--color-text-secondary)}.qp-choice:has(input:checked) .qp-key{background:var(--color-secondary);color:#fff}.qp-choice-text{min-width:0;line-height:1.55;overflow-wrap:anywhere}.qp-choice-text .katex{font-size:1.05em}.qp-actions-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 20px;margin-top:20px}.qp-actions{display:flex;flex-wrap:wrap;gap:12px}.qp-actions:empty{display:none}.qp-report{display:inline-flex;align-items:center;gap:6px;margin-left:auto;font-size:var(--text-sm);color:var(--color-text-secondary);text-decoration:none;white-space:nowrap}.qp-report:hover{color:var(--color-primary)}.qp-nav{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--color-divider)}.qp-nav .btn{min-height:40px;padding:7px 15px;font-size:var(--text-sm)}.qp-count{font-size:var(--text-sm);font-weight:600;color:var(--color-text-muted);font-variant-numeric:tabular-nums}.qp-locked{text-align:center;padding:36px 20px;border:1px dashed var(--color-border-strong);border-radius:var(--radius-lg);background:var(--color-bg-soft);color:var(--color-text-secondary)}.qp-locked-icon{display:grid;place-items:center;width:48px;height:48px;margin:0 auto 12px;border-radius:50%;background:var(--color-accent-soft);color:var(--color-warning)}.qp-locked h3{font-size:var(--text-xl);margin-bottom:6px}.qp-locked p{max-width:46ch;margin:0 auto 16px}.qp-locked .btn-row{justify-content:center}.qp-run{position:absolute;inset:-8px;z-index:2;padding:24px 16px;background:#ffffffe0;backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);border-radius:var(--radius-sm);animation:qp-fade .22s ease}.qp-run:focus{outline:none}.qp-run-card{position:sticky;top:calc(var(--header-h) + 64px);width:min(400px,100%);margin-inline:auto;display:grid;gap:12px;animation:qp-rise .26s ease}.qp-run[data-state=done] .qp-run-card{justify-items:center;text-align:center;gap:8px}.qp-run-title{margin:0;font-family:var(--font-display);font-size:1.15rem;font-weight:700;color:var(--color-heading)}.qp-run-sub{margin:0 0 8px;font-size:var(--text-sm);color:var(--color-text-secondary)}.qp-run-bar{height:8px;border-radius:4px;background:var(--gray-100);overflow:hidden}.qp-run-bar>span{display:block;height:100%;border-radius:4px;background:var(--color-primary);transition:width .4s ease}.qp-run-steps{list-style:none;margin:4px 0 0;padding:0;display:grid;gap:8px}.qp-run-steps li{display:flex;align-items:center;gap:12px;margin:0;font-size:var(--text-sm);color:var(--color-text-muted);transition:color .15s}.qp-run-steps li[data-state=active]{color:var(--color-text);font-weight:700}.qp-run-steps li[data-state=done]{color:var(--color-text-secondary)}.qp-run-mark{flex:none;width:18px;height:18px;border-radius:50%;border:2px solid var(--color-border);transition:background .15s,border-color .15s}[data-state=active]>.qp-run-mark{border-color:var(--color-primary-line);border-top-color:var(--color-primary);animation:spin .8s linear infinite}[data-state=done]>.qp-run-mark{border-color:var(--color-success);background:var(--color-success) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7'/%3E%3C/svg%3E") center / 10px no-repeat}.qp-run-icon{display:grid;place-items:center;width:52px;height:52px;margin-bottom:4px;border-radius:50%;background:var(--color-success-soft);color:var(--color-success);animation:qp-pop .32s ease}.qp-run-icon .icon{width:26px;height:26px}.qp-run-icon:has(use[href$="#i-x"]){background:var(--color-error-soft);color:var(--color-error)}html:has(.qp-results[open]){overflow:hidden}.qp-results{width:min(1000px,calc(100vw - 32px));max-width:none;max-height:calc(100dvh - 32px);margin:auto;padding:0;color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden}.qp-results[open]{display:flex;flex-direction:column;animation:qp-rise .24s ease}.qp-results::backdrop{background:#071a428c;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);animation:qp-fade .22s ease}.qp-results-head{flex:none;display:flex;justify-content:space-between;align-items:flex-start;gap:16px;padding:20px 24px 16px;border-bottom:1px solid var(--color-divider)}.qp-results-heading{min-width:0}.qp-results-head .qp-kicker{color:var(--color-primary)}.qp-results-head h2{margin:0;font-size:1.45rem;line-height:1.25}.qp-results-q{margin:2px 0 0;font-size:var(--text-sm);color:var(--color-text-secondary)}.qp-results-close{flex:none;display:grid;place-items:center;width:40px;height:40px;margin:-4px -8px 0 0;padding:0;border:0;border-radius:50%;background:transparent;color:var(--color-text-secondary);cursor:pointer;transition:background .15s}.qp-results-close:hover{background:var(--color-surface-hover);color:var(--color-text)}.qp-results-body{flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:20px 24px 24px}.qp-results-body>*+*{margin-top:16px}.qp-results-foot{flex:none;display:flex;justify-content:flex-end;flex-wrap:wrap;gap:12px;padding:12px 24px;border-top:1px solid var(--color-divider);background:var(--color-surface-sunken)}.qp-score{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:center;padding:16px 20px;border-radius:var(--radius-sm);background:var(--color-surface-sunken)}.qp-score-num{display:flex;align-items:baseline;gap:.3rem;margin:0;font-family:var(--font-display);font-variant-numeric:tabular-nums}.qp-score-num strong{font-size:2.2rem;line-height:1;color:var(--color-heading)}.qp-score-num span{color:var(--color-text-muted);font-weight:600}.qp-score-label{font-weight:700;font-size:var(--text-sm);margin:0 0 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