._page_1jfbn_1{--page-accent:var(--accent,var(--crimson,#df1f34));--page-accent-strong:var(--accent-strong,var(--crimson-dark,#9b1022));--page-highlight:var(--pb-highlight,var(--page-accent));--page-surface:var(--reading-surface,var(--ivory,#f5efdf));--page-ink:var(--reading-ink,var(--charcoal,#111114))}._catalogUnavailable_1jfbn_9{color:#17181b;background:#fffdf8;border:1px solid #c9c5bc;border-radius:6px;width:min(100% - 24px,42rem);margin:clamp(24px,6vw,64px) auto;padding:clamp(20px,5vw,36px)}._catalogUnavailable_1jfbn_9 h1{color:#17181b;margin:0 0 16px;font-size:clamp(1.55rem,5vw,2.2rem)}._catalogUnavailableNotice_1jfbn_25{gap:10px;display:grid}._catalogUnavailableNotice_1jfbn_25 strong{font-size:1rem}._catalogUnavailableNotice_1jfbn_25 p{color:#42444a;margin:0}._catalogUnavailableNotice_1jfbn_25 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var(--page-surface) 70%, transparent);margin:0;font-size:.72rem}._catalogCoverageHeader_1jfbn_55 label{gap:5px;width:min(100%,270px);display:grid}._catalogCoverageHeader_1jfbn_55 select{border:1px solid color-mix(in srgb, var(--page-surface) 42%, transparent);background:color-mix(in srgb, var(--page-surface) 8%, transparent);min-height:44px;color:var(--page-surface);padding:8px 11px;font-weight:850}._catalogCoverageHeader_1jfbn_55 option{background:var(--page-surface);color:var(--page-ink)}._catalogCoverageSummary_1jfbn_104{color:color-mix(in srgb, var(--page-surface) 72%, transparent);align-items:baseline;gap:9px;margin-top:15px;font-size:.7rem;display:flex}._catalogCoverageSummary_1jfbn_104 strong{color:var(--page-highlight);font-size:1.4rem}._catalogCoverageGrid_1jfbn_118{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:10px;display:grid}._catalogCoverageGrid_1jfbn_118 article{border:1px solid color-mix(in srgb, var(--page-surface) 34%, 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strong{color:var(--page-highlight);font-family:var(--font-display);font-size:clamp(1.7rem,3.4vw,2.6rem);line-height:.9}._libraryCount_1jfbn_223 span{color:color-mix(in srgb, var(--page-surface) 70%, transparent);letter-spacing:.05em;text-transform:uppercase;margin-top:4px;font-size:.58rem;font-weight:850}._libraryDisclosure_1jfbn_251{border:1px solid color-mix(in srgb, var(--page-surface) 28%, transparent);background:color-mix(in srgb, var(--page-surface) 6%, transparent);color:color-mix(in srgb, var(--page-surface) 82%, transparent);flex-wrap:wrap;align-items:center;gap:8px 22px;margin:0 0 12px;padding:10px 12px;font-size:.66rem;line-height:1.45;display:flex}._libraryDisclosure_1jfbn_251>p{max-width:78ch;margin:0}._libraryDisclosure_1jfbn_251>p:first-child strong{color:var(--page-highlight)}._controls_1jfbn_274{border:1px solid color-mix(in srgb, var(--page-surface) 30%, transparent);background:color-mix(in srgb, var(--page-surface) 7%, 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0;font-size:.67rem;line-height:1.4}._moreFilters_1jfbn_381{border-top:1px solid color-mix(in srgb, var(--page-surface) 22%, transparent);grid-column:1/-1}._moreFilters_1jfbn_381>summary,._progressKey_1jfbn_387>summary{width:fit-content;min-height:44px;color:var(--page-accent-strong);cursor:pointer;letter-spacing:.04em;text-transform:uppercase;align-items:center;font-size:.68rem;font-weight:900;display:flex}._moreFilters_1jfbn_381>summary{color:var(--page-surface)}:is(._moreFilters_1jfbn_381>summary:focus-visible,._progressKey_1jfbn_387>summary:focus-visible){outline:3px solid var(--page-highlight);outline-offset:2px}._moreFilterGrid_1jfbn_410{grid-template-columns:repeat(4,minmax(150px,1fr));gap:10px;padding-top:4px;display:grid}._filterActions_1jfbn_417{grid-column:1/-1;align-items:center;gap:10px;display:flex}._filterActions_1jfbn_417 button,._filterActions_1jfbn_417 a{min-height:38px;padding:7px 11px}._filterActions_1jfbn_417 button,._filterActions_1jfbn_417 a,._loadMoreRows_1jfbn_432 button,._pagination_1jfbn_433 button,._nextPageFailure_1jfbn_434 button{background:var(--page-accent);color:#fff;cursor:pointer;text-transform:uppercase;border:2px solid #050506;justify-content:center;align-items:center;min-height:44px;padding:9px 13px;font-size:.68rem;font-weight:900;display:inline-flex}._filterActions_1jfbn_417 a{background:var(--page-surface);color:var(--page-ink)}._controls_1jfbn_274 label>span,._areaSwitch_1jfbn_287 legend,._moreFilters_1jfbn_381>summary,._filterActions_1jfbn_417 button,._filterActions_1jfbn_417 a{letter-spacing:normal;text-transform:none;font-size:.875rem;font-weight:600}._legend_1jfbn_465{margin:0;padding:4px 0 12px}._legend_1jfbn_465 .status-assisted{color:var(--page-surface)}._progressKey_1jfbn_387{width:fit-content;color:var(--page-surface);margin:12px 0 4px}._progressKey_1jfbn_387>summary{color:color-mix(in srgb, var(--page-surface) 82%, transparent)}._resultsHeading_1jfbn_484{width:fit-content;color:var(--ivory,#f5efdf);margin:28px 0 0;font-size:clamp(1.7rem,3vw,2.35rem)}._resultsToolbar_1jfbn_491{justify-content:space-between;align-items:end;gap:16px;margin-top:28px;display:flex}._resultsToolbar_1jfbn_491 ._resultsHeading_1jfbn_484{margin-top:0}._resultSort_1jfbn_503{align-items:end;gap:8px;display:flex}._resultSort_1jfbn_503 label{gap:4px;display:grid}._resultSort_1jfbn_503 label>span{color:color-mix(in srgb, var(--page-surface) 82%, transparent);letter-spacing:.06em;text-transform:uppercase;font-size:.58rem;font-weight:900}._resultSort_1jfbn_503 select,._resultSort_1jfbn_503 button{border:2px solid var(--page-surface);min-height:44px;font:inherit}._resultSort_1jfbn_503 select{background:var(--page-surface);min-width:210px;color:var(--page-ink);padding:8px 34px 8px 10px}._resultSort_1jfbn_503 button{background:var(--page-accent);color:#fff;cursor:pointer;text-transform:uppercase;padding:8px 14px;font-size:.68rem;font-weight:900}:is(._resultSort_1jfbn_503 select:focus-visible,._resultSort_1jfbn_503 button:focus-visible){outline:3px solid var(--page-highlight);outline-offset:3px}._resultCount_1jfbn_552{flex-wrap:wrap;align-items:center;gap:10px;min-height:44px;display:flex}._resultCount_1jfbn_552 a{min-height:44px;color:inherit;text-transform:uppercase;background:0 0;border:1px solid;align-items:center;padding:7px 9px;font-size:.65rem;font-weight:850;display:inline-flex}._resultCount_1jfbn_552 strong{color:var(--page-highlight)}._row_1jfbn_577{grid-template-columns:minmax(260px,1.5fr) minmax(205px,1fr) 175px}._rowHead_1jfbn_581{border-bottom:2px solid var(--page-accent);background:color-mix(in srgb, var(--page-surface) 8%, transparent);color:color-mix(in srgb, var(--page-surface) 82%, transparent);letter-spacing:.06em;text-transform:uppercase;font-size:.62rem}._alphaLabel_1jfbn_590{color:var(--page-highlight);letter-spacing:.06em;text-transform:uppercase;border:1px 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var(--page-ink);background:var(--page-surface);min-width:88px;min-height:44px;color:var(--page-ink);cursor:pointer;letter-spacing:.03em;text-transform:uppercase;justify-content:center;align-items:center;margin-top:10px;padding:8px 12px;font-size:.66rem;font-weight:900;display:inline-flex}._favoriteButton_1jfbn_643[data-saved=true]{background:var(--page-accent);color:#fff}._favoriteButton_1jfbn_643:disabled{cursor:wait;opacity:.7}._favoriteButton_1jfbn_643:focus-visible{outline:3px solid var(--page-highlight);outline-offset:3px}._favoriteUnavailable_1jfbn_676{width:fit-content;color:color-mix(in srgb, var(--page-ink) 72%, transparent);text-transform:uppercase;margin-top:10px;font-size:.6rem;font-weight:850;display:block}._identity_1jfbn_629>h3{margin-top:7px;margin-bottom:0;font-size:.88rem}._previewHeading_1jfbn_692{width:100%}._previewTrigger_1jfbn_696{overscroll-behavior-inline:contain;width:100%;min-width:0;min-height:44px;color:inherit;cursor:pointer;font:inherit;text-align:left;background:0 0;border:0;align-content:center;padding:0;display:grid;overflow:auto hidden}:is(._previewTrigger_1jfbn_696:hover ._previewTitle_1jfbn_714,._previewTrigger_1jfbn_696:focus-visible ._previewTitle_1jfbn_714){color:var(--page-accent-strong);text-underline-offset:4px;text-decoration:underline}._previewTrigger_1jfbn_696:focus-visible{outline:3px solid var(--page-accent);outline-offset:4px}._previewMeta_1jfbn_726{border-left:3px solid var(--page-accent);width:fit-content;color:var(--page-accent-strong);letter-spacing:.04em;flex-wrap:wrap;align-items:center;gap:4px;margin-bottom:8px;padding:3px 7px;font-size:.72rem;font-weight:900;display:flex}._previewTitle_1jfbn_714{min-width:0;max-width:100%;font-family:Georgia,Times New Roman,ui-serif,serif;font-size:1.02rem;font-weight:700;line-height:1.42}._previewTitle_1jfbn_714 .math-markup{white-space:normal;max-width:100%;overflow:visible}._previewTitle_1jfbn_714 .katex{font-size:1em}._previewTrigger_1jfbn_696:after{content:"View problem statement";color:color-mix(in srgb, var(--page-ink) 64%, transparent);letter-spacing:.04em;text-transform:uppercase;margin-top:4px;font-size:.58rem;font-weight:850}._previewTrigger_1jfbn_696[data-statement=coming-soon]:after{content:"Statement coming soon"}._previewTrigger_1jfbn_696[data-statement=access-options]:after{content:"View access options"}._previewAvailable_1jfbn_778{cursor:default}._previewAvailable_1jfbn_778:after{content:none}._previewOpenButton_1jfbn_786{width:fit-content;min-height:44px;color:color-mix(in srgb, var(--page-ink) 64%, transparent);cursor:pointer;font:inherit;letter-spacing:.04em;text-align:left;text-transform:uppercase;background:0 0;border:0;margin-top:4px;padding:8px 0;font-size:.58rem;font-weight:850}._previewAvailable_1jfbn_778:focus-within ._previewTitle_1jfbn_714{color:var(--page-accent-strong);text-underline-offset:4px;text-decoration:underline}._previewOpenButton_1jfbn_786:focus-visible{outline:3px solid var(--page-accent);outline-offset:4px}._previewUnavailable_1jfbn_814{cursor:default}._previewUnavailable_1jfbn_814:after{content:"Availability not loaded"}._previewUnavailable_1jfbn_814:hover ._previewTitle_1jfbn_714{color:inherit;text-decoration:none}._identity_1jfbn_629>h3 a{align-items:center;min-height:44px;display:inline-flex}._tags_1jfbn_833{flex-wrap:wrap;gap:5px;margin-top:6px;display:flex}._tags_1jfbn_833 span{border:1px solid color-mix(in srgb, var(--page-ink) 28%, transparent);text-transform:uppercase;background:0 0;padding:3px 7px;font-size:.63rem;font-weight:850}._privateTags_1jfbn_849{flex-wrap:wrap;align-items:center;gap:5px;margin-top:8px;font-size:.62rem;display:flex}._privateTags_1jfbn_849 strong{color:var(--page-accent-strong);text-transform:uppercase;margin-right:2px;font-weight:900}._privateTags_1jfbn_849 span{border:1px dashed color-mix(in srgb, var(--page-ink) 42%, transparent);overflow-wrap:anywhere;background:0 0;padding:3px 7px}._privateTags_1jfbn_849[data-state=empty] span,._privateTags_1jfbn_849[data-state=unavailable] span{opacity:.7;background:0 0;border:0}._privateTagActions_1jfbn_879{color:var(--ivory,#f5efdf);flex-wrap:wrap;align-items:center;gap:10px;margin:12px 0;font-size:.68rem;display:flex}._privateTagActions_1jfbn_879 button,._privateTagDialog_1jfbn_890 button{border:2px solid var(--page-ink);background:var(--page-accent);color:#fff;cursor:pointer;min-height:44px;font:inherit;padding:8px 12px;font-weight:900}._privateTagActions_1jfbn_879 button:disabled,._privateTagDialog_1jfbn_890 button:disabled{cursor:wait;opacity:.65}:is(._privateTagActions_1jfbn_879 button:focus-visible,._privateTagDialog_1jfbn_890 button:focus-visible,._privateTagDialog_1jfbn_890 input:focus-visible,._privateTagDialog_1jfbn_890 select:focus-visible){outline:3px solid var(--page-highlight);outline-offset:3px}._privateTagDialog_1jfbn_890{background:var(--page-surface);width:min(680px,100vw - 24px);max-height:min(820px,100dvh - 24px);color:var(--page-ink);border:3px solid #050506;margin:auto;padding:clamp(18px,3vw,28px);overflow:auto;box-shadow:8px 8px #050506}._privateTagDialog_1jfbn_890::backdrop{background:#050506b8}._problemPreviewDialog_1jfbn_931{background:var(--page-surface);width:min(780px,100vw - 24px);max-height:min(820px,100dvh - 24px);color:var(--page-ink);border:3px solid #050506;margin:auto;padding:clamp(20px,3vw,32px);overflow:auto;box-shadow:8px 8px #050506}._problemPreviewDialog_1jfbn_931::backdrop{background:#050506b8}._problemPreviewDialog_1jfbn_931>header>span{color:var(--page-accent-strong);letter-spacing:.08em;text-transform:uppercase;font-size:.68rem;font-weight:900}._problemPreviewDialog_1jfbn_931>header h2{font-family:var(--font-display);text-transform:uppercase;margin:5px 0;font-size:clamp(1.45rem,4vw,2.15rem)}._problemPreviewDialog_1jfbn_931>header p{color:color-mix(in srgb, var(--page-ink) 68%, transparent);margin:0 0 20px;line-height:1.45}._problemPreviewContent_1jfbn_968{gap:18px;min-width:0;display:grid}._problemPreviewMathTitle_1jfbn_974{border-bottom:1px solid color-mix(in srgb, var(--page-ink) 24%, transparent);min-width:0;margin:0;padding-bottom:10px;font-family:Georgia,Times New Roman,ui-serif,serif;font-size:clamp(1.05rem,2.5vw,1.3rem);line-height:1.45}._problemPreviewMathTitle_1jfbn_974 .math-markup{max-width:100%}._previewLoading_1jfbn_988{gap:12px;display:grid}._previewSkeleton_1jfbn_993{border:2px solid var(--page-ink);background:var(--page-surface);gap:10px;padding:clamp(16px,3vw,24px);display:grid}._previewSkeleton_1jfbn_993 span{background:linear-gradient(90deg, color-mix(in srgb, var(--page-ink) 10%, var(--page-surface)), color-mix(in srgb, var(--page-ink) 20%, var(--page-surface)), color-mix(in srgb, var(--page-ink) 10%, var(--page-surface)));background-size:220% 100%;border-radius:2px;height:14px;animation:1.25s ease-in-out infinite _problem-preview-skeleton_1jfbn_1;display:block}._previewSkeleton_1jfbn_993 span:first-child{width:44%}._previewSkeleton_1jfbn_993 span:nth-child(2){width:94%}._previewSkeleton_1jfbn_993 span:nth-child(3){width:82%}._previewSkeleton_1jfbn_993 span:nth-child(4){width:63%}@keyframes _problem-preview-skeleton_1jfbn_1{0%{background-position:100% 0}to{background-position:-100% 0}}@media (prefers-reduced-motion:reduce){._previewSkeleton_1jfbn_993 span{background-position:0 0;animation:none}}._problemPreviewContent_1jfbn_968>.math-markup{border:2px solid var(--page-ink);background:var(--page-surface);color:var(--page-ink);padding:clamp(16px,3vw,24px);font-family:Georgia,Times New Roman,serif;font-size:clamp(.98rem,2vw,1.12rem);line-height:1.7}._problemPreviewContent_1jfbn_968>p,._previewError_1jfbn_1059 p{margin:0;line-height:1.6}._previewError_1jfbn_1059{gap:10px;display:grid}._problemPreviewActions_1jfbn_1069,._previewError_1jfbn_1059{align-items:center}._problemPreviewActions_1jfbn_1069{border-top:1px solid color-mix(in srgb, var(--page-ink) 24%, transparent);flex-wrap:wrap;gap:10px;padding-top:4px;display:flex}._problemPreviewActions_1jfbn_1069 a,._problemPreviewActions_1jfbn_1069 button,._previewError_1jfbn_1059 button{border:2px solid var(--page-ink);background:var(--page-accent);color:#fff;cursor:pointer;min-height:44px;font:inherit;text-transform:uppercase;justify-content:center;align-items:center;padding:9px 13px;font-size:.68rem;font-weight:900;display:inline-flex}._problemPreviewActions_1jfbn_1069 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a{border-color:buttontext}._moreFilters_1jfbn_381>summary,._progressKey_1jfbn_387>summary,._libraryDisclosure_1jfbn_251>summary{color:linktext}._libraryDisclosure_1jfbn_251>summary:focus-visible{outline-color:highlight}._catalogAd_1jfbn_1361,._catalogAdMeta_1jfbn_1377,._catalogAdAction_1jfbn_1405{border-color:canvastext}._catalogAdAction_1jfbn_1405:focus-visible{outline-color:highlight}._favoriteButton_1jfbn_643[data-saved=true]{color:highlighttext;background:highlight}._privateTagDialog_1jfbn_890::backdrop{opacity:.75;background:canvas}._problemPreviewDialog_1jfbn_931::backdrop{opacity:.75;background:canvas}}