.landing_page__By2iE{--l-max:1180px;--l-gutter:clamp(16px,4vw,48px);--l-gap:clamp(40px,6vw,88px);--l-section:clamp(72px,9vw,112px);--l-column:760px;--l-wide:920px;--l-nav-h:64px;--l-scene-h:clamp(320px,calc(100svh - var(--l-nav-h) - 380px),660px);--l-edge:#dce7f8;--l-ground:#edf3fd;--l-ground-2:#e4ecfa;--l-strong:var(--ink);--l-glow:var(--accent-bright);--l-frame:var(--accent);--l-text:var(--ink);--l-text-soft:#3a4a66;--l-text-muted:var(--muted);--l-line:color-mix(in srgb,var(--accent) 14%,transparent);--l-line-strong:color-mix(in srgb,var(--accent) 50%,transparent);--l-gold:#efd08a;--l-metal-bronze:var(--tier-bronze);--l-metal-silver:var(--tier-silver);--l-metal-gold:var(--tier-gold);--l-metal-platinum:var(--tier-platinum);--l-metal-diamond:var(--tier-diamond);--l-metal-master:var(--tier-master);--l-danger:var(--danger);--l-success:var(--success);--focus-ring:2px solid var(--accent);--focus-offset:3px;background:var(--l-ground);color:var(--l-text);overflow-x:clip}@media (max-width:959px){.landing_page__By2iE{--l-scene-h:clamp(260px,42svh,460px)}}html:has(.landing_page__By2iE){background:#edf3fd;color-scheme:light}.landing_container__4HF8_{margin:0 auto;max-width:var(--l-max);padding-inline:var(--l-gutter)}.landing_srOnly___RukU{border:0;clip:rect(0 0 0 0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;white-space:nowrap;width:1px}.landing_nav__34epT{-webkit-backdrop-filter:blur(var(--glass-blur)) saturate(var(--glass-saturate));backdrop-filter:blur(var(--glass-blur)) saturate(var(--glass-saturate));background:color-mix(in srgb,#f6f9fe 80%,transparent);border-bottom:1px solid var(--l-line);margin-bottom:calc(-1 * var(--l-nav-h));position:sticky;top:0;z-index:100}@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.landing_nav__34epT{background:#f6f9fe}}@media (prefers-reduced-transparency:reduce){.landing_nav__34epT{-webkit-backdrop-filter:none;backdrop-filter:none;background:#f6f9fe}}.landing_navInner__GwmGS{align-items:center;display:flex;gap:var(--space-3);justify-content:space-between;min-height:var(--l-nav-h)}.landing_navLinks__rjx06{align-items:center;display:flex;gap:clamp(12px,2.4vw,28px)}.landing_navLinks__rjx06 a:not(.landing_navCta__LgTB_){align-items:center;color:var(--l-text-soft);display:inline-flex;font:500 var(--step--1) var(--font-sans);justify-content:center;min-height:var(--control-h);min-width:var(--control-h);transition:color .16s var(--ease-out)}@media (hover:hover){.landing_navLinks__rjx06 a:not(.landing_navCta__LgTB_):hover{color:var(--l-text)}}.landing_navLinks__rjx06 a{white-space:nowrap}.landing_navSignin__zuAEi{text-decoration:none}.landing_nav__34epT[data-hero-actions=true] :is(.landing_navSignin__zuAEi,.landing_navCta__LgTB_){display:none}.landing_navCta__LgTB_{background:transparent;border-color:var(--l-line-strong);color:var(--l-text);padding-inline:var(--space-3)}@media (hover:hover){.landing_navCta__LgTB_:hover{background:color-mix(in srgb,var(--l-frame) 10%,transparent);border-color:var(--l-frame)}}@media (max-width:399px){.landing_navLinks__rjx06 a.landing_navAbout__JUlBK{display:none}}@media (max-width:599px){.landing_navLinks__rjx06 a.landing_navCta__LgTB_{display:none}}.landing_hero__v7463{display:flex;flex-direction:column;isolation:isolate;padding-top:calc(var(--l-nav-h) + var(--l-scene-h));position:relative}.landing_hero__v7463[data-grab=true]{cursor:pointer}.landing_heroScene__6GAJN{inset:0;position:absolute;z-index:0}.landing_heroInner__NC2cI{position:relative;width:100%;z-index:1}.landing_heroCopy__BPBal{margin:0 auto;max-width:44rem;padding-block:var(--space-4-5) 0;text-align:center}.landing_heroTitle__HLnmZ{color:var(--l-text);font-family:var(--font-math);font-size:clamp(40px,min(5vw,8.2svh),84px);font-weight:400;letter-spacing:-.018em;line-height:1.04;margin:0}.landing_heroTitle__HLnmZ span{display:block;white-space:nowrap}.landing_heroLead__zXTDN{color:var(--l-text-soft);font-size:clamp(17px,1.35vw,20px);line-height:1.5;margin:var(--space-3) auto 0;max-width:38ch;text-wrap:pretty}@media (max-width:599px){.landing_heroLead__zXTDN{max-width:30ch}}.landing_heroActions__O_W0j{display:flex;flex-wrap:wrap;gap:var(--space-2-5);justify-content:center;margin-top:var(--space-4-5)}.landing_ctaLine__x7qvw,.landing_ctaPrimary__eTziG{font:600 var(--step-0)/1 var(--font-sans);min-height:48px;padding-inline:var(--space-4)}.landing_ctaPrimary__eTziG{background:var(--accent);border-color:var(--accent);color:var(--white)}.landing_ctaLine__x7qvw{background:transparent;border-color:var(--l-line-strong);color:var(--l-text);font-weight:500}@media (hover:hover){.landing_ctaPrimary__eTziG:hover{background:var(--accent-dark);border-color:var(--accent-dark)}.landing_ctaLine__x7qvw:hover{background:color-mix(in srgb,var(--l-frame) 10%,transparent);border-color:var(--l-frame)}}@media (max-width:959px){.landing_heroCopy__BPBal{max-width:34rem;padding-block:var(--space-3) 0}.landing_heroTitle__HLnmZ{font-size:clamp(30px,10vw,54px)}}@media (max-height:500px) and (max-width:959px){.landing_hero__v7463{min-height:100svh;padding-top:calc(var(--l-nav-h) + var(--space-3))}.landing_heroInner__NC2cI{align-content:center;display:grid;flex:1}.landing_heroCopy__BPBal{margin:0;max-width:min(34rem,60%);padding-block:0 var(--space-3);text-align:left}.landing_heroLead__zXTDN{margin-inline:0}.landing_heroActions__O_W0j{justify-content:flex-start}}@media (prefers-reduced-motion:no-preference){.landing_heroCopy__BPBal{animation:landing_settle__xIKYU .22s var(--ease-out) .2s both}html[data-landing-seen] .landing_heroCopy__BPBal{animation:none}}@keyframes landing_settle__xIKYU{0%{opacity:0}to{opacity:1}}.landing_band__jYZgM{padding-block:var(--l-section) 0;position:relative}.landing_bandInner__zHwvu{display:flex;justify-content:center;position:relative}.landing_paper__Ri5BM{--focus-ring:2px solid var(--accent);--focus-offset:2px;color:var(--ink);color-scheme:light;max-width:var(--l-column);width:100%}.landing_paper__Ri5BM .sheet{background:var(--white);border-color:color-mix(in srgb,var(--accent) 22%,transparent)}.landing_sheet__dYKt4{display:flex;flex-direction:column;position:relative;scroll-margin-top:calc(var(--l-nav-h) + var(--space-5))}.landing_sheetHead__D5VJn{align-items:baseline;border-bottom:1px solid var(--line);display:flex;flex-wrap:wrap;gap:var(--space-1) var(--space-3);justify-content:space-between;padding-bottom:var(--space-2-5)}.landing_sheetTitle__MrxBO{font:650 var(--step-0)/1.3 var(--font-sans);letter-spacing:0;margin:0}.landing_sheetSource__VAdXP{color:var(--ink-2);font:500 var(--step--1)/1.3 var(--font-sans)}.landing_statement__I2nNr{color:var(--ink);font-size:var(--step-1);line-height:1.6;margin:var(--space-4) 0 var(--space-4-5)}.landing_qed__Rmydx{bottom:12px;position:absolute;right:12px}.landing_answerArea__ztb5T{align-items:flex-start;display:flex;flex-direction:column;gap:var(--space-4)}.landing_choices__5W722{border:0;margin:0;min-width:0;padding:0;width:100%}.landing_answerLegend__m6tXp{color:var(--ink-2);font:500 var(--step--1) var(--font-sans);margin-bottom:var(--space-2);padding:0}.landing_choiceRow__4ZBdd{display:grid;gap:var(--space-1) var(--space-2);grid-template-columns:minmax(0,1fr)}@media (min-width:560px){.landing_choiceRow__4ZBdd{grid-template-columns:repeat(5,minmax(0,1fr))}}.landing_choice__SVjPR{align-items:center;border-radius:var(--radius-md);cursor:pointer;display:flex;gap:var(--space-2-5);margin-inline:calc(var(--space-2) * -1);min-height:var(--control-h);padding:var(--space-1) var(--space-2);transition:transform .12s var(--ease-out)}@media (min-width:560px){.landing_choice__SVjPR{margin-inline:0;padding-inline:var(--space-1)}}.landing_choice__SVjPR:active{transform:scale(.97)}.landing_choices__5W722:disabled .landing_choice__SVjPR{cursor:default;transform:none}.landing_choices__5W722:disabled .landing_choice__SVjPR:not([data-mark]){opacity:.5}.landing_choiceInput__1dmWd{height:1px;margin:0;opacity:0;position:absolute;width:1px}.landing_bubble__JPDIy{align-items:center;border:1.5px solid var(--line-strong);border-radius:50%;display:inline-flex;flex:0 0 auto;height:28px;justify-content:center;overflow:hidden;position:relative;transition:border-color .16s var(--ease-out);width:28px}.landing_bubble__JPDIy:before{background:var(--accent);clip-path:inset(0 100% 0 0);content:"";inset:0;position:absolute;transition:clip-path .18s var(--ease-out),background-color .18s var(--ease-out)}.landing_bubble__JPDIy:after{background:var(--danger);content:"";height:1.6px;left:-2px;opacity:0;position:absolute;right:-2px;top:50%;transform:rotate(-45deg) scaleX(.2);transition:opacity .16s var(--ease-out),transform .18s var(--ease-out)}.landing_bubbleLetter__gDNpq{color:var(--ink-2);font:600 var(--step--1)/1 var(--font-sans);position:relative;transition:color .16s var(--ease-out)}.landing_choiceValue__zhi5a{color:var(--ink);font-family:var(--font-math);font-size:var(--step-1);font-variant-numeric:lining-nums proportional-nums;min-width:0}@media (hover:hover){.landing_choices__5W722:not(:disabled) .landing_choice__SVjPR:hover .landing_bubble__JPDIy{border-color:var(--accent)}.landing_choices__5W722:not(:disabled) .landing_choice__SVjPR:hover .landing_bubbleLetter__gDNpq{color:var(--accent)}}.landing_choiceInput__1dmWd:focus-visible+.landing_bubble__JPDIy{outline:var(--focus-ring);outline-offset:3px}.landing_choice__SVjPR[data-mark=picked] .landing_bubble__JPDIy{border-color:var(--accent)}.landing_choice__SVjPR[data-mark=picked] .landing_bubble__JPDIy:before{clip-path:inset(0)}.landing_choice__SVjPR[data-mark=picked] .landing_bubbleLetter__gDNpq{color:var(--white)}.landing_choice__SVjPR[data-mark=correct] .landing_bubble__JPDIy{border-color:var(--success)}.landing_choice__SVjPR[data-mark=correct] .landing_bubble__JPDIy:before{background:var(--success);clip-path:inset(0)}.landing_choice__SVjPR[data-mark=correct] .landing_bubbleLetter__gDNpq{color:var(--white)}.landing_choice__SVjPR[data-mark=wrong] .landing_bubble__JPDIy{border-color:var(--danger)}.landing_choice__SVjPR[data-mark=wrong] .landing_bubbleLetter__gDNpq{color:var(--danger-dark)}.landing_choice__SVjPR[data-mark=wrong] .landing_bubble__JPDIy:after{opacity:1;transform:rotate(-45deg) scaleX(1)}.landing_digits__VE8Vm[data-mark=wrong] input{border-color:var(--danger)}.landing_digits__VE8Vm[data-mark=correct] fieldset:disabled input{border-color:var(--success);color:var(--success-dark)}.landing_check__1E3NB{min-width:148px}.landing_check__1E3NB[aria-disabled=true]{cursor:progress;opacity:.6}.landing_result__2cb5C:empty{display:none}.landing_result__2cb5C{margin-top:var(--space-4)}.landing_result__2cb5C:focus{outline:none}.landing_result__2cb5C:focus-visible{outline:var(--focus-ring);outline-offset:6px}.landing_verdict__5BBSP{align-items:center;display:flex;font:650 var(--step-0)/1.4 var(--font-sans);gap:var(--space-2);margin:0}.landing_verdictMark__Fw_Ye{flex:0 0 auto}.landing_verdict__5BBSP[data-verdict=correct] .landing_verdictMark__Fw_Ye{color:var(--success)}.landing_verdict__5BBSP[data-verdict=wrong] .landing_verdictMark__Fw_Ye{color:var(--danger)}.landing_invite__mXhd0{color:var(--ink-2);font-size:var(--step--1);line-height:1.55;margin:var(--space-1) 0 0 calc(20px + var(--space-2))}.landing_hint__i_nuN{color:var(--muted);font-size:var(--step--1);margin:0}.landing_error__1AQhz{color:var(--danger-dark);font-size:var(--step--1);line-height:1.5;margin:var(--space-3) 0 0}.landing_license__6Ktvc{border-top:1px solid var(--line);color:var(--muted);font-size:var(--step--1);line-height:1.5;margin:var(--space-4-5) 0 0;padding:var(--space-2-5) var(--space-4) 0 0}.landing_closing__boCe_{align-items:center;display:flex;flex-direction:column;gap:var(--space-4);padding-block:var(--l-section);text-align:center}.landing_closingLogo__E1gUt{height:auto;margin-bottom:var(--space-2);width:min(440px,80vw)}.landing_closingTitle__DdkH5{color:var(--l-text);font-family:var(--font-math);font-size:clamp(28px,3.2vw,40px);font-weight:400;letter-spacing:-.01em;line-height:1.15;margin:0;max-width:28ch;text-wrap:balance}.landing_footer__U__I_{background:var(--l-edge);border-top:1px solid var(--l-line)}.landing_footerInner__8av47{align-items:center;display:flex;flex-direction:column;gap:var(--space-1);padding-block:var(--space-4) var(--space-4);text-align:center}.landing_colophon__AHEwL{color:var(--l-text-muted);font-size:var(--step--1);line-height:1.5;margin:0;max-width:72ch}.landing_footerLinks__ETkls{display:flex;flex-wrap:wrap;gap:0 var(--space-4);justify-content:center}.landing_footerLinks__ETkls a{align-items:center;color:var(--l-text-soft);display:inline-flex;font:500 var(--step--1) var(--font-sans);justify-content:center;min-height:var(--control-h);min-width:var(--control-h);transition:color .16s var(--ease-out)}@media (hover:hover){.landing_footerLinks__ETkls a:hover{color:var(--l-text)}}.moments_story__p5_wr{display:grid;gap:var(--l-section);padding-block:var(--l-section) 0;text-align:center}.moments_story__p5_wr h2{color:var(--l-text);font-family:var(--font-math);font-size:var(--step-3);font-weight:400;letter-spacing:-.005em;line-height:1.2;margin:0 auto var(--space-5);max-width:20ch;text-wrap:balance}.moments_figure__o0zmd,.moments_levels__YvZgA{margin:0}.moments_figure__o0zmd figcaption,.moments_levels__YvZgA figcaption{color:var(--l-text-soft);font:400 var(--step-0)/1.5 var(--font-sans);margin:var(--space-3) auto 0;max-width:46ch}.moments_example__7olla{color:var(--l-text-muted);display:block;font:500 var(--step--1)/1.5 var(--font-sans);margin:var(--space-2) 0 0}.moments_levels__YvZgA{--tier-bronze:var(--l-metal-bronze);--tier-silver:var(--l-metal-silver);--tier-gold:var(--l-metal-gold);--tier-platinum:var(--l-metal-platinum);--tier-diamond:var(--l-metal-diamond);--tier-master:var(--l-metal-master);--road-y:64px}.moments_road__W2DMt{height:120px;margin:var(--space-5) auto 0;max-width:var(--l-wide);position:relative}.moments_track__GcbmS{border-top:1px dashed var(--l-line-strong);bottom:var(--road-y);left:0;position:absolute;right:0}.moments_trackLit__qeVv7{background:var(--l-strong);bottom:calc(var(--road-y) - .5px);height:2px;left:0;position:absolute;width:calc(var(--at) * 100%)}.moments_tiers__ZYaP9{inset:0;list-style:none;margin:0;padding:0;position:absolute}.moments_tiers__ZYaP9 li{align-content:start;bottom:0;display:grid;gap:2px var(--space-2);grid-template-columns:auto auto;height:var(--road-y);justify-content:start;left:calc(var(--at) * 100%);padding-top:22px;position:absolute}.moments_tiers__ZYaP9 li:before{background:var(--metal,var(--l-frame));content:"";height:14px;left:0;position:absolute;top:-7px;width:2px}.moments_tiers__ZYaP9 li[data-tier=bronze]{--metal:var(--l-metal-bronze)}.moments_tiers__ZYaP9 li[data-tier=silver]{--metal:var(--l-metal-silver)}.moments_tiers__ZYaP9 li[data-tier=gold]{--metal:var(--l-metal-gold)}.moments_tiers__ZYaP9 li[data-tier=platinum]{--metal:var(--l-metal-platinum)}.moments_tiers__ZYaP9 li[data-tier=diamond]{--metal:var(--l-metal-diamond)}.moments_tiers__ZYaP9 li[data-tier=master]{--metal:var(--l-metal-master)}.moments_tierMark__Rrif3{grid-row:span 2;margin-top:1px}.moments_tierName__jJbzj{color:var(--l-text);font:600 var(--step--1)/1.3 var(--font-sans)}.moments_tierFrom__G06ws{color:var(--l-text-muted);font:500 var(--step--1)/1.3 var(--font-sans);grid-column:2}.moments_end__oVfyP{bottom:calc(var(--road-y) - 30px);color:var(--l-text-muted);font:500 var(--step--1)/1 var(--font-sans);position:absolute;right:0}.moments_you__e5a2j{bottom:calc(var(--road-y) - 12px);left:calc(var(--at) * 100% - 12px);position:absolute}.moments_you__e5a2j b{align-items:center;background:var(--l-strong);border-radius:50%;color:var(--l-ground);display:flex;font:700 var(--step--2)/1 var(--font-sans);height:24px;justify-content:center;outline:1px solid color-mix(in srgb,var(--l-strong) 45%,transparent);outline-offset:3px;width:24px}@media (max-width:959px){.moments_levels__YvZgA{--road-x:14px;--span:calc(100% - 44px)}.moments_road__W2DMt{height:440px;margin:var(--space-3) auto 0;max-width:320px;text-align:left}.moments_track__GcbmS{border-left:1px dashed var(--l-line-strong);border-top:0;bottom:44px;left:var(--road-x);right:auto;top:0}.moments_trackLit__qeVv7{bottom:auto;height:calc(var(--at) * var(--span));left:calc(var(--road-x) - .5px);top:0;width:2px}.moments_tiers__ZYaP9 li{bottom:auto;height:auto;left:0;padding:0 0 0 calc(var(--road-x) + 26px);right:0;top:calc(var(--at) * var(--span) - 9px)}.moments_tiers__ZYaP9 li:before{height:2px;left:calc(var(--road-x) - 7px);top:9px;width:14px}.moments_end__oVfyP{bottom:30px;left:calc(var(--road-x) + 26px);right:auto}.moments_you__e5a2j{bottom:auto;left:calc(var(--road-x) - 12px);top:calc(var(--at) * var(--span) - 12px)}}.moments_pair__FOfYV{display:grid;gap:var(--l-section);grid-template-columns:minmax(0,1fr);margin-inline:auto;max-width:var(--l-column);width:100%}.moments_histogram__9flz3{display:block;height:auto;margin-inline:auto;max-width:560px;width:100%}.moments_other__16MzP{fill:color-mix(in srgb,var(--l-frame) 48%,var(--l-ground))}.moments_contest__a8PRq{fill:color-mix(in srgb,var(--l-glow) 62%,var(--l-strong));stroke:var(--l-ground);stroke-width:1}.moments_baseline__i33Tq{stroke:var(--l-line-strong);stroke-width:1}.moments_marker__0prlj{stroke:var(--l-strong);stroke-width:2}.moments_markerNode__NPLQr{fill:var(--l-strong)}.moments_axis__SpoXK{color:var(--l-text-muted);display:flex;font:500 var(--step--1) var(--font-sans);justify-content:space-between;margin:4px auto 0;max-width:560px}.moments_key__OaVvY{color:var(--l-text-soft);display:flex;flex-wrap:wrap;font:500 var(--step--1)/1.4 var(--font-sans);gap:var(--space-1) var(--space-3);justify-content:center;list-style:none;margin:var(--space-2-5) 0 0;padding:0}.moments_key__OaVvY li{align-items:center;display:inline-flex;gap:6px}.moments_key__OaVvY i{display:inline-block;height:10px;width:10px}.moments_keyContest__XjIPG{background:color-mix(in srgb,var(--l-glow) 62%,var(--l-strong))}.moments_keyOther__n8UCL{background:color-mix(in srgb,var(--l-frame) 48%,var(--l-ground))}.moments_key__OaVvY .moments_keyThis__e4EAI{background:var(--l-strong);width:2px}.moments_timeline__TsBhM{display:grid;gap:var(--space-4);list-style:none;margin:0 auto;padding:0;position:relative;text-align:left;width:fit-content}.moments_timeline__TsBhM:before{background:color-mix(in srgb,var(--l-strong) 50%,transparent);bottom:24px;content:"";left:28px;position:absolute;top:28px;width:1px}.moments_timeline__TsBhM li{align-items:center;column-gap:var(--space-4);display:grid;grid-template-columns:56px minmax(0,1fr);position:relative}.moments_frame__2mYe8{align-items:center;background:var(--l-ground);border:1px solid color-mix(in srgb,var(--l-frame) 55%,transparent);border-radius:6px;color:var(--l-text);display:inline-flex;grid-row:span 2;height:48px;justify-content:center;justify-self:center;width:48px}.moments_missed__91C3a{color:var(--l-danger)}.moments_repaired__4GKSI{border-color:var(--l-frame);color:var(--l-success)}.moments_hollow__T7Lzm{border:1.6px solid var(--l-text);border-radius:50%;box-sizing:border-box;display:inline-block;height:14px;width:14px}.moments_timeline__TsBhM time{align-self:end;color:var(--l-text);font:650 var(--step--1)/1.3 var(--font-sans)}.moments_timeline__TsBhM li>span:last-child{align-self:start;color:var(--l-text-soft);font:400 var(--step--1)/1.4 var(--font-sans)}@media (forced-colors:active){.moments_key__OaVvY i,.moments_tiers__ZYaP9 li:before,.moments_trackLit__qeVv7,.moments_you__e5a2j b{background:CanvasText}.moments_you__e5a2j b{color:Canvas}}.answer-sheet-digits_sheet__KqOn_{border:0;margin:0;min-width:0;padding:0}.answer-sheet-digits_legend__fU6dY{color:var(--muted);font:500 var(--step--1) var(--font-sans);margin-bottom:var(--space-2);padding:0}.answer-sheet-digits_boxes__WD35v{display:flex;gap:var(--space-2)}.answer-sheet-digits_box__M5xlV{appearance:none;background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);font-family:var(--font-math);font-size:var(--step-2);font-variant-numeric:lining-nums tabular-nums;height:60px;text-align:center;transition:border-color .15s var(--ease-out);width:52px}.answer-sheet-digits_box__M5xlV:focus-visible{border-color:var(--accent);outline:var(--focus-ring);outline-offset:2px}.answer-sheet-digits_sheet__KqOn_:disabled .answer-sheet-digits_box__M5xlV{background:var(--paper-2);border-color:var(--line);color:var(--ink-2)}.answer-sheet-digits_hint__ZPVJp{color:var(--muted);font:400 var(--step--1) var(--font-sans);margin:var(--space-2) 0 0}@media (prefers-reduced-motion:reduce){.answer-sheet-digits_box__M5xlV{transition:none}}.clock-text_clock__jzs3B{font-variant-numeric:tabular-nums;white-space:nowrap}.clock-text_colon__4AnkJ{font-variant-numeric:normal}.completed_section__hnw15{display:flex;flex-direction:column;gap:var(--space-3);margin-top:var(--space-4);max-width:72rem}.completed_head__KuLvT h2{font:650 var(--step-1)/1.2 var(--font-sans);letter-spacing:var(--tracking-snug);margin:0}.completed_head__KuLvT p{color:var(--ink-2);font:400 var(--step--1)/1.5 var(--font-sans);margin:var(--space-1) 0 0}.completed_controls__fH_RO{align-items:end;display:flex;flex-wrap:wrap;gap:var(--space-1) var(--space-5)}.completed_search__PaaOn{display:flex;flex-direction:column;gap:var(--space-1);width:min(20rem,100%)}.completed_search__PaaOn span{color:var(--muted);font:500 var(--step--1)/1.2 var(--font-sans)}.completed_search__PaaOn input{background:var(--paper);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);font:400 var(--step-0)/1.4 var(--font-sans);min-height:var(--control-h);width:100%;padding:var(--space-2) var(--space-2-5)}.completed_search__PaaOn input:focus-visible{border-color:var(--accent);outline:var(--focus-ring);outline-offset:0}.completed_filterToggle__y5_3O{background:none;border:0;color:var(--accent-dark);cursor:pointer;display:none;font:600 var(--step--1) var(--font-sans);min-height:44px;padding:0;text-align:left;text-decoration:underline;text-underline-offset:.2em;width:fit-content}.completed_filterToggle__y5_3O:focus-visible{outline:var(--focus-ring);outline-offset:2px}.completed_filters__NA6hu{display:contents}.completed_choices__xqd69{align-items:center;border:0;display:flex;flex-wrap:wrap;gap:0 var(--space-4);margin:0;min-width:0;padding:0}.completed_choices__xqd69 legend{color:var(--muted);float:left;font:500 var(--step--1)/1 var(--font-sans);margin-right:var(--space-3);padding:0}.completed_choices__xqd69 label{align-items:center;cursor:pointer;display:inline-flex;font:500 var(--step--1)/1 var(--font-sans);gap:var(--space-2);min-height:44px}.completed_choices__xqd69 input{clip-path:inset(50%);height:1px;overflow:hidden;position:absolute;width:1px}.completed_bubble__9WNIR{border:1.5px solid var(--ink);border-radius:50%;display:inline-block;height:14px;width:14px}.completed_choices__xqd69 input:checked+.completed_bubble__9WNIR{background:var(--ink);box-shadow:inset 0 0 0 2.5px var(--paper)}.completed_choices__xqd69 input:focus-visible+.completed_bubble__9WNIR{outline:var(--focus-ring);outline-offset:2px}.completed_matchLine__CVk_2{color:var(--muted);font:500 var(--step--1)/1.4 var(--font-sans);margin:0}.completed_day__8Fnu2{margin-top:var(--space-2)}.completed_day__8Fnu2 h3{align-items:baseline;border-bottom:1px solid var(--line-strong);display:flex;flex-wrap:wrap;font:650 var(--step-0)/1.3 var(--font-sans);gap:var(--space-1) var(--space-3);margin:0;padding-bottom:var(--space-2)}.completed_day__8Fnu2 h3 span{color:var(--muted);font:500 var(--step--1)/1.3 var(--font-sans)}.completed_day__8Fnu2 ul{list-style:none;margin:0;padding:0}.completed_row__qquFP{align-items:center;background:transparent;border:0;border-bottom:1px solid var(--line);color:var(--ink);cursor:pointer;display:grid;gap:var(--space-3);grid-template-columns:16px minmax(0,1fr) 6.5rem 11rem;min-height:56px;padding:var(--space-2) var(--space-2);text-align:left;transition:background-color .15s var(--ease-out);width:100%}.completed_row__qquFP:focus-visible{outline:var(--focus-ring);outline-offset:-2px}@media (hover:hover){.completed_row__qquFP:hover{background:var(--paper-2)}}.completed_mark__5f35i{border:1.5px solid var(--ink);border-radius:50%;box-sizing:border-box;display:block;height:16px;width:16px}.completed_mark__5f35i[data-result=solved]{background:var(--success);border-color:var(--success)}.completed_mark__5f35i[data-result=repaired]{border-color:var(--success);box-shadow:inset 0 0 0 3px var(--paper),inset 0 0 0 8px var(--success)}.completed_mark__5f35i[data-result=relapsed]{border-color:var(--success)}.completed_mark__5f35i[data-result=missed]{border-color:var(--muted)}.completed_title__ogxTK{display:flex;flex-direction:column;gap:2px;min-width:0}.completed_title__ogxTK strong{font:600 var(--step--1)/1.3 var(--font-sans)}.completed_title__ogxTK small{color:var(--muted);font:400 var(--step--1)/1.35 var(--font-sans)}.completed_outcome__qXaMN{font:600 var(--step--1)/1.3 var(--font-sans)}.completed_outcome__qXaMN[data-result=missed]{color:var(--muted);font-weight:500}.completed_facts__DYHNm{color:var(--muted);font:400 var(--step--1)/1.35 var(--font-sans)}.completed_more__j00Hh,.completed_textButton__FwEGL{background:none;border:0;color:var(--accent-dark);cursor:pointer;font:600 var(--step--1) var(--font-sans);justify-self:start;min-height:44px;padding:0;text-decoration:underline;text-underline-offset:.2em;width:fit-content}.completed_more__j00Hh:focus-visible,.completed_textButton__FwEGL:focus-visible{outline:var(--focus-ring);outline-offset:2px}.completed_state__L2_yT{color:var(--ink-2);font-size:var(--step-0);line-height:1.55;margin:0;max-width:60ch}.completed_state__L2_yT p{margin:0 0 var(--space-2)}@media (max-width:720px){.completed_row__qquFP{grid-template-columns:16px minmax(0,1fr) auto}.completed_facts__DYHNm{grid-column:2/-1}.completed_filterToggle__y5_3O{display:inline-flex;align-items:center}.completed_filters__NA6hu{display:none;flex-basis:100%}.completed_filters__NA6hu[data-open]{display:block}}.practice_page__uVaNJ{container:practice/inline-size}.practice_page__uVaNJ a,.practice_page__uVaNJ button,.practice_page__uVaNJ input,.practice_page__uVaNJ select,.practice_page__uVaNJ textarea{touch-action:manipulation}.practice_srOnly__O6KTT{clip:rect(0 0 0 0);clip-path:inset(50%);height:1px;overflow:hidden;position:absolute;white-space:nowrap;width:1px}.practice_queuePanel__8FDIx{max-height:0;overflow:hidden}.practice_queuePanel__8FDIx.practice_queueOpen__TYml6{max-height:none;overflow:visible}@keyframes practice_panelIn__zJ6QF{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}.practice_filterPanel__BAsHz.practice_filtersOpen__8FEwi>*,.practice_queuePanel__8FDIx.practice_queueOpen__TYml6>*{animation:practice_panelIn__zJ6QF .18s var(--ease-out)}.practice_pageHeader__q98fM{align-items:baseline;display:flex;flex-wrap:wrap;gap:var(--space-2) var(--space-4);justify-content:space-between;margin-bottom:var(--space-4)}.practice_pageHeader__q98fM h1{font:650 var(--step-3)/1.1 var(--font-sans);letter-spacing:var(--tracking-snug);margin:0}.practice_sessionLine__fh4hF{color:var(--muted);font:500 var(--step--1) var(--font-sans);margin:0}.practice_modeRow__JZ14N{border-bottom:1px solid var(--line);display:flex;gap:var(--space-5);overflow-x:auto;scrollbar-width:none}.practice_modeRow__JZ14N::-webkit-scrollbar{display:none}.practice_modeCurrent__kWl8e,.practice_modeLink__1peYJ{align-items:baseline;background:none;border:0;border-bottom:2px solid transparent;color:var(--muted);cursor:pointer;font:inherit;display:inline-flex;flex:none;gap:var(--space-2);margin-bottom:-1px;min-height:var(--control-h);padding-top:var(--space-2-5);text-decoration:none;transition:color .16s var(--ease-out),border-color .16s var(--ease-out)}.practice_modeCurrent__kWl8e{border-bottom-color:var(--ink);color:var(--ink)}.practice_modeRow__JZ14N strong{font:600 var(--step--1) var(--font-sans)}.practice_modeRow__JZ14N small{color:var(--muted);font:400 var(--step--1) var(--font-sans)}@media (hover:hover){.practice_modeLink__1peYJ:hover{border-bottom-color:var(--line-strong);color:var(--ink)}}.practice_controlStrip__RQf1h{align-items:center;display:flex;flex-wrap:wrap;gap:var(--space-2) var(--space-4);justify-content:space-between;padding:var(--space-3) 0}.practice_filterSummary__CFb2i{align-items:center;display:flex;flex:1 1 320px;flex-wrap:wrap;gap:var(--space-2) var(--space-3);min-width:0}.practice_filterLine__xUsM6{color:var(--ink-2);font:400 var(--step--1)/1.4 var(--font-sans);margin:0}.practice_filterLine__xUsM6 b{color:var(--ink);font-weight:650}.practice_filterChips__3dx24{display:flex;flex-wrap:wrap;gap:var(--space-2)}.practice_filterChips__3dx24 button{align-items:center;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);cursor:pointer;display:inline-flex;font:500 var(--step--1) var(--font-sans);gap:6px;min-height:32px;padding:0 var(--space-2);transition:border-color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_filterChips__3dx24 button svg{color:var(--muted)}.practice_filterChips__3dx24 button:active{transform:scale(.97)}@media (hover:hover){.practice_filterChips__3dx24 button:hover{border-color:var(--line-strong)}.practice_filterChips__3dx24 button:hover svg{color:var(--ink)}}.practice_resetFilters__3DSj7{background:none;border:0;color:var(--accent-dark);cursor:pointer;font:500 var(--step--1) var(--font-sans);min-height:var(--control-h);padding:0;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.2em}@media (hover:hover){.practice_resetFilters__3DSj7:hover{color:var(--accent)}}.practice_controlActions__YNJ5v{align-items:center;display:flex;flex-wrap:wrap;gap:var(--space-2)}.practice_focusButton__PjpG2,.practice_mobileFilterButton__zB7_y,.practice_mobileQueueDisclosure__LVOIw,.practice_shuffleButton__xYAHr{align-items:center;background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);cursor:pointer;display:inline-flex;font:550 var(--step--1) var(--font-sans);gap:var(--space-2);min-height:var(--control-h);padding:0 var(--space-3);transition:background-color .15s var(--ease-out),border-color .15s var(--ease-out),color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_mobileFilterButton__zB7_y,.practice_mobileQueueDisclosure__LVOIw{display:inline-flex}.practice_focusButton__PjpG2:active,.practice_mobileFilterButton__zB7_y:active,.practice_mobileQueueDisclosure__LVOIw:active,.practice_shuffleButton__xYAHr:active{transform:scale(.97)}.practice_mobileFilterButton__zB7_y[aria-expanded=true],.practice_mobileQueueDisclosure__LVOIw[aria-expanded=true]{border-color:var(--ink)}.practice_focusButton__PjpG2[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:var(--white)}@media (hover:hover){.practice_focusButton__PjpG2:hover,.practice_mobileFilterButton__zB7_y:hover,.practice_mobileQueueDisclosure__LVOIw:hover,.practice_shuffleButton__xYAHr:hover{border-color:var(--ink)}}.practice_mobileFilterButton__zB7_y,.practice_mobileQueueDisclosure__LVOIw{white-space:nowrap}.practice_stripCount__QCc7c{color:var(--muted);font-weight:500}.practice_stripChevron__wlZoI{color:var(--muted);transition:transform .2s var(--ease-out)}[aria-expanded=true]>.practice_stripChevron__wlZoI{transform:rotate(180deg)}.practice_filterPanel__BAsHz{max-height:0;overflow:hidden}.practice_filterPanel__BAsHz.practice_filtersOpen__8FEwi{max-height:1400px;overflow:visible}.practice_filterPanelInner__QZMeH{border-bottom:1px solid var(--line);border-top:1px solid var(--line);container:filters/inline-size;display:flex;flex-direction:column;gap:var(--space-4);padding:var(--space-4) 0}.practice_filterSection__l0haY+.practice_filterSection__l0haY{border-top:1px solid var(--line);padding-top:var(--space-4)}.practice_filterGroup__Kfg66{border:0;display:grid;gap:var(--space-3) var(--space-4);grid-template-columns:minmax(0,1fr);margin:0;min-width:0;padding:0}.practice_filterGroupLegend__XBppz{color:var(--ink);font:600 var(--step-0)/1.3 var(--font-sans);margin-bottom:var(--space-3);padding:0}.practice_filterSearch__Pfqfm{display:flex;flex-direction:column;gap:var(--space-2)}.practice_filterSearch__Pfqfm input{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);font:500 var(--step--1) var(--font-sans);min-height:var(--control-h);padding:0 var(--space-2-5);width:100%}@container filters (min-width: 360px){.practice_filterGroup__Kfg66{grid-template-columns:repeat(2,minmax(0,1fr))}.practice_filterSearch__Pfqfm{grid-column:1/-1}}@container filters (min-width: 640px){.practice_filterGroup__Kfg66{grid-template-columns:repeat(3,minmax(0,1fr))}.practice_filterFind__4QD5S{grid-template-columns:minmax(0,2fr) repeat(2,minmax(0,1fr))}.practice_filterFind__4QD5S .practice_filterSearch__Pfqfm{grid-column:auto}}@container filters (min-width: 880px){.practice_filterGroup__Kfg66{grid-template-columns:repeat(4,minmax(0,1fr))}.practice_filterFind__4QD5S{grid-template-columns:minmax(0,2fr) repeat(2,minmax(0,1fr))}}.practice_toggleField__8Tx9t{display:flex;flex-direction:column;gap:var(--space-2)}.practice_starToggle__NORaS{align-items:center;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);cursor:pointer;display:inline-flex;font:550 var(--step--1) var(--font-sans);gap:var(--space-2);min-height:var(--control-h);padding:0 var(--space-2-5);transition:border-color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_starToggle__NORaS:before{border:1.5px solid;border-radius:50%;content:"";flex:none;height:12px;width:12px}.practice_starToggle__NORaS:active{transform:scale(.97)}.practice_starToggle__NORaS[aria-pressed=true]{border-color:var(--accent)}.practice_starToggle__NORaS[aria-pressed=true]:before{background:var(--accent);border-color:var(--accent)}@media (hover:hover){.practice_starToggle__NORaS:hover{border-color:var(--line-strong)}}.practice_filterFooter__GrQ18{align-items:center;display:flex;flex-wrap:wrap;gap:var(--space-3);justify-content:space-between}.practice_filterNote__PvVXv{color:var(--muted);flex:1 1 100%;font:400 var(--step--1)/1.5 var(--font-sans);margin:0;max-width:64ch}.practice_queueHead__UMHwd{align-items:baseline;border-bottom:1px solid var(--line);border-top:1px solid var(--line);color:var(--muted);display:flex;font:500 var(--step--1) var(--font-sans);justify-content:space-between;padding:var(--space-2-5) 0}.practice_queueHead__UMHwd>span:first-child{color:var(--ink);font-weight:600}.practice_queueList__MRZEK{list-style:none;margin:0;padding:0}.practice_queueRow__N62_t{align-items:center;background:transparent;border:0;border-bottom:1px solid var(--line);color:var(--ink);cursor:pointer;display:grid;gap:var(--space-3);grid-template-columns:28px minmax(0,1fr) auto;min-height:56px;padding:var(--space-2) var(--space-2);text-align:left;transition:background-color .15s var(--ease-out);width:100%}.practice_queueRow__N62_t[aria-current=true]{background:var(--paper-2)}.practice_queueRow__N62_t:disabled{cursor:default;opacity:.6}@media (hover:hover){.practice_queueRow__N62_t:hover:not(:disabled){background:var(--paper-2)}}.practice_queueIndex__ciY0_{align-items:center;border:1.5px solid var(--line-strong);border-radius:50%;color:var(--ink-2);display:inline-flex;font:600 var(--step--2) var(--font-sans);height:28px;justify-content:center;width:28px}.practice_queueRow__N62_t[aria-current=true] .practice_queueIndex__ciY0_{border-color:var(--ink);color:var(--ink)}.practice_queueIndex__ciY0_[data-solved],.practice_queueRow__N62_t .practice_queueIndex__ciY0_[data-solved],.practice_queueRow__N62_t[aria-current=true] .practice_queueIndex__ciY0_[data-solved]{background:var(--success);border-color:var(--success);color:var(--white)}.practice_queueIndex__ciY0_[data-missed]{border-color:var(--danger);color:var(--danger-dark)}.practice_queueTitle__jvpBE{display:flex;flex-direction:column;gap:2px;min-width:0}.practice_queueTitle__jvpBE strong{font:600 var(--step--1)/1.3 var(--font-sans)}.practice_queueTitle__jvpBE small{color:var(--muted);font:400 var(--step--1)/1.35 var(--font-sans)}.practice_queueMeta__crg4c{align-items:center;color:var(--muted);display:inline-flex;font:500 var(--step--1) var(--font-sans);gap:var(--space-2)}.practice_queueMore__U0N5B{color:var(--muted);font:400 var(--step--1) var(--font-sans);margin:0;padding:var(--space-3) 0}.practice_queueEmpty__1bL6C{align-items:flex-start;color:var(--muted);display:flex;flex-direction:column;font:400 var(--step--1)/1.5 var(--font-sans);gap:var(--space-1);padding:var(--space-4) 0}.practice_queueEmpty__1bL6C strong{color:var(--ink);font-weight:600}.practice_workspace__Wb4N2{display:flex;flex-direction:column;gap:var(--space-4);min-height:0;min-width:0}@container practice (min-width: 860px){.practice_page__uVaNJ .practice-layout{column-gap:var(--space-5);grid-template-columns:minmax(0,1fr) 264px}.practice_page__uVaNJ .problem-queue{grid-column:1/2}.practice_page__uVaNJ .practice_rail__h2qJG{align-self:start;grid-column:2;grid-row:1/span 2}}@container practice (min-width: 1180px){.practice_page__uVaNJ .practice-layout{grid-template-columns:minmax(0,1fr) 320px}}.practice_problemSheet__NC5nf{display:flex;flex-direction:column;gap:var(--space-4);position:relative}.practice_problemSheet__NC5nf:focus,.practice_problemSheet__NC5nf:focus-visible{outline:none}.practice_sheetHead__kJela{align-items:start;display:grid;gap:2px var(--space-3);grid-template-columns:minmax(0,1fr) auto}.practice_sheetSource__Wd2Nz{font:600 var(--step-0)/1.3 var(--font-sans);margin:0}.practice_sheetSource__Wd2Nz span{color:var(--muted);font-weight:500;margin-left:4px}.practice_sheetDifficulty__yCb__{color:var(--ink);font-weight:650;margin-right:6px}.practice_sheetTools__YUnNm{align-items:center;display:flex;gap:var(--space-2);grid-column:2;grid-row:1/span 2;justify-self:end}.practice_sheetRecord__ozzBz{color:var(--ink-2);grid-column:1/-1;font:500 var(--step--1)/1.4 var(--font-sans);margin:var(--space-1) 0 0}.practice_sheetFacts__RZPb4{color:var(--muted);font:400 var(--step--1)/1.4 var(--font-sans);grid-column:1;margin:0}.practice_starButton__PSnYQ{align-items:center;background:none;border:0;border-radius:var(--radius-md);color:var(--muted);cursor:pointer;display:inline-flex;font:500 var(--step--1) var(--font-sans);gap:6px;grid-column:2;grid-row:1/span 2;justify-self:end;margin:-10px -10px 0 0;min-height:var(--control-h);padding:0 10px;transition:color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_starButton__PSnYQ:active:not(:disabled){transform:scale(.97)}.practice_starButton__PSnYQ[aria-pressed=true]{color:var(--accent-dark)}.practice_starButton__PSnYQ[aria-pressed=true] svg{color:var(--accent);fill:currentColor}@media (hover:hover){.practice_starButton__PSnYQ:hover:not(:disabled){color:var(--ink)}}.practice_statement__nKHts{font-family:var(--font-math);font-size:clamp(18px,1.4vw,21px);font-weight:400;letter-spacing:0;line-height:1.6;margin:0;max-width:var(--measure-solve);text-wrap:pretty}.practice_statement__nKHts .katex{font-size:1em}.practice_statement__nKHts .problem-figure{display:block;height:auto;margin:var(--space-3) auto;max-width:100%}.practice_attribution__EJakV{color:var(--muted);font:400 var(--step--1)/1.5 var(--font-sans);margin:calc(var(--space-2) * -1) 0 0}.practice_attribution__EJakV a{color:var(--muted);text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--muted) 45%,transparent);text-decoration-thickness:1px;text-underline-offset:.2em}@media (hover:hover){.practice_attribution__EJakV a:hover{color:var(--ink)}}.practice_externalMark___hext{margin-left:4px;vertical-align:-1px}.practice_choices__lozTU{border-top:1px solid var(--line);display:flex;flex-direction:column;max-width:var(--measure-solve);padding-top:var(--space-2)}.practice_choice__ln1tl{align-items:center;background:transparent;border:0;border-radius:var(--radius-md);color:var(--ink);cursor:pointer;display:grid;gap:var(--space-3);grid-template-columns:30px minmax(0,1fr);margin:0 calc(var(--space-2) * -1);min-height:52px;padding:var(--space-1) var(--space-2);text-align:left;transition:background-color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_choice__ln1tl:active:not([aria-disabled=true]){transform:scale(.985)}.practice_choice__ln1tl[aria-disabled=true]{cursor:default}@media (hover:hover){.practice_choice__ln1tl:hover:not([aria-disabled=true]){background:var(--paper-2)}.practice_choice__ln1tl:hover:not([aria-disabled=true]) .practice_bubble__TRHoc{border-color:var(--ink)}}.practice_bubble__TRHoc{align-items:center;border:1.5px solid var(--ink-2);border-radius:50%;color:var(--ink-2);display:inline-flex;font:600 var(--step--1) var(--font-sans);height:30px;justify-content:center;position:relative;transition:border-color .15s var(--ease-out),color .15s var(--ease-out);width:30px}.practice_bubble__TRHoc:before{background:var(--bubble-fill,var(--accent));border-radius:50%;clip-path:inset(0 100% 0 0);content:"";inset:1px;position:absolute;transition:clip-path .18s var(--ease-out);z-index:-1}.practice_bubble__TRHoc{isolation:isolate}.practice_choiceValue__QLqzt{font-family:var(--font-math);font-size:1.08em;font-variant-numeric:lining-nums proportional-nums;line-height:1.45;min-width:0;overflow-x:auto;overflow-y:hidden}.practice_choiceValue__QLqzt .katex{font-size:1em}.practice_choice__ln1tl[data-state=selected] .practice_bubble__TRHoc{border-color:var(--accent);color:var(--white)}.practice_choice__ln1tl[data-state=selected] .practice_bubble__TRHoc:before{clip-path:inset(0)}.practice_choice__ln1tl[data-state=correct] .practice_bubble__TRHoc{--bubble-fill:var(--success);border-color:var(--success);color:var(--white)}.practice_choice__ln1tl[data-state=correct] .practice_bubble__TRHoc:before{clip-path:inset(0)}.practice_choice__ln1tl[data-state=correct] .practice_choiceValue__QLqzt{color:var(--success-dark)}.practice_choice__ln1tl[data-state=incorrect] .practice_bubble__TRHoc{border-color:var(--danger);color:var(--danger-dark)}.practice_choice__ln1tl[data-state=incorrect] .practice_bubble__TRHoc:after{background:var(--danger);content:"";height:2px;left:-5px;position:absolute;right:-5px;top:calc(50% - 1px);transform:rotate(-35deg)}.practice_choice__ln1tl[data-state=incorrect] .practice_choiceValue__QLqzt{color:var(--danger-dark);text-decoration:line-through;text-decoration-color:color-mix(in srgb,var(--danger) 55%,transparent);text-decoration-thickness:1px}.practice_choice__ln1tl[data-state=correct]:focus-visible{outline-color:var(--success-dark)}.practice_choice__ln1tl[data-state=incorrect]:focus-visible{outline-color:var(--danger-dark)}.practice_answerSheet__ej7yO{border-top:1px solid var(--line);max-width:var(--measure-solve);padding-top:var(--space-3)}.practice_shortAnswer__fqM_Y{display:flex;flex-direction:column;gap:var(--space-2)}.practice_shortAnswer__fqM_Y label{color:var(--muted);font:500 var(--step--1) var(--font-sans)}.practice_shortAnswer__fqM_Y input{background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);font:400 var(--step-2) var(--font-math);font-variant-numeric:lining-nums tabular-nums;max-width:360px;min-height:56px;padding:0 var(--space-3);transition:border-color .15s var(--ease-out);width:100%}.practice_shortAnswer__fqM_Y input:focus-visible{border-color:var(--accent)}.practice_shortAnswer__fqM_Y input:disabled{background:var(--paper-2);color:var(--ink-2)}.practice_shortAnswer__fqM_Y small{color:var(--muted);font:400 var(--step--1)/1.5 var(--font-sans)}.practice_sheetFooter__is2QQ{align-items:center;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:var(--space-2) var(--space-3);padding-top:var(--space-3)}.practice_submissionMessage__71lYR{color:var(--muted);flex:1 1 200px;font:400 var(--step--1)/1.4 var(--font-sans)}.practice_submissionMessage__71lYR:focus{outline:none}.practice_errorMessage__2TT_d{background:var(--danger-soft);border-radius:var(--radius);color:var(--danger-dark);padding:var(--space-2) var(--space-2-5)}.practice_quietButton__NPZ5i,.practice_skipButton__ZKA6_{background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);font:550 var(--step--1) var(--font-sans);padding:0 var(--space-3);transition:border-color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_primaryNext__wuc8C,.practice_quietButton__NPZ5i,.practice_skipButton__ZKA6_,.practice_submitButton__Tctc5{align-items:center;cursor:pointer;display:inline-flex;gap:var(--space-2);justify-content:center;min-height:var(--control-h)}.practice_primaryNext__wuc8C,.practice_submitButton__Tctc5{background:var(--accent);border:1px solid var(--accent);border-radius:var(--radius-md);color:var(--white);font:600 var(--step--1) var(--font-sans);min-width:142px;padding:0 var(--space-4);transition:background-color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_primaryNext__wuc8C:active:not(:disabled),.practice_quietButton__NPZ5i:active:not(:disabled),.practice_skipButton__ZKA6_:active:not(:disabled),.practice_submitButton__Tctc5:active:not(:disabled){transform:scale(.97)}.practice_primaryNext__wuc8C:disabled,.practice_quietButton__NPZ5i:disabled,.practice_skipButton__ZKA6_:disabled,.practice_submitButton__Tctc5:disabled{cursor:not-allowed;opacity:.45}@media (hover:hover){.practice_quietButton__NPZ5i:hover:not(:disabled),.practice_skipButton__ZKA6_:hover:not(:disabled){border-color:var(--ink)}.practice_primaryNext__wuc8C:hover:not(:disabled),.practice_submitButton__Tctc5:hover:not(:disabled){background:var(--accent-dark)}}.practice_result__m84Fk{align-items:start;border-top:1px solid var(--line);display:grid;gap:var(--space-3);grid-template-columns:auto minmax(0,1fr);padding-top:var(--space-3)}.practice_result__m84Fk:focus,.practice_result__m84Fk:focus-visible{outline:none}.practice_resultMark__bQEOz{margin-top:-1px}.practice_result__m84Fk[data-state=correct] .practice_resultMark__bQEOz{color:var(--success)}.practice_result__m84Fk[data-state=incorrect] .practice_resultMark__bQEOz{color:var(--danger)}.practice_result__m84Fk p{display:flex;flex-direction:column;gap:2px;margin:0}.practice_result__m84Fk strong{font:600 var(--step-1)/1.25 var(--font-sans);letter-spacing:var(--tracking-normal)}.practice_result__m84Fk[data-state=correct] strong{color:var(--success-dark)}.practice_result__m84Fk p>span{color:var(--muted);font:400 var(--step--1)/1.45 var(--font-sans)}.practice_tombstone__GwjGk{bottom:12px;position:absolute;right:12px}@keyframes practice_solutionIn__eZnuF{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.practice_solutionPanel__GmRbq{animation:practice_solutionIn__eZnuF .22s var(--ease-out);display:flex;flex-direction:column;gap:var(--space-4)}.practice_solutionBody__TLK06{border-top:1px solid var(--line);max-width:68ch;padding-top:var(--space-4)}.practice_solutionBody__TLK06 h3{font:600 var(--step-0)/1.3 var(--font-sans);margin:0}.practice_solutionBody__TLK06 p{font:400 var(--step-0)/1.7 var(--font-math);margin:var(--space-2) 0 0;text-wrap:pretty}.practice_solutionBody__TLK06 .practice_solutionNote__87zQn{color:var(--ink-2);font:400 var(--step--1)/1.6 var(--font-sans)}.practice_hintCards__3bzD8 a,.practice_hintRungBody__Wg6bR a,.practice_solutionBody__TLK06 a{color:var(--accent-dark);display:inline-flex;font:500 var(--step--1) var(--font-sans);margin-top:var(--space-2);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.2em}.practice_nextActions__ZFNnX{border-top:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-4);padding-top:var(--space-4)}.practice_nextActionCopy___JWZf{display:flex;flex-direction:column;gap:var(--space-1);max-width:68ch}.practice_nextActionCopy___JWZf>strong{font:600 var(--step-0)/1.35 var(--font-sans)}.practice_nextActionCopy___JWZf p{color:var(--ink-2);font:400 var(--step--1)/1.55 var(--font-sans);margin:0}.practice_nextActionCopy___JWZf a{color:var(--accent-dark);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.2em}.practice_nextActionButtons__cVOt3{align-items:center;display:flex;flex-wrap:wrap;gap:var(--space-2)}.practice_nextActionButtons__cVOt3>.practice_primaryNext__wuc8C{margin-left:auto}.practice_rail__h2qJG{display:flex;flex-direction:column;gap:var(--space-4);min-width:0}.practice_rail__h2qJG>*+*{border-top:1px solid var(--line);padding-top:var(--space-4)}.practice_conceptTagsLabel___gHh4,.practice_metricLabel__pT35n{align-items:center;color:var(--muted);display:flex;font:500 var(--step--1) var(--font-sans);gap:var(--space-2);margin:0}.practice_liveMetrics__3mAnp{display:flex;flex-direction:column;gap:var(--space-1)}.practice_paceRow__3IStI{align-items:center;display:flex;gap:var(--space-2);justify-content:space-between}.practice_paceRow__3IStI strong{color:var(--ink);font:650 var(--step-numeral-sm)/1.1 var(--font-sans);letter-spacing:var(--tracking-snug);transition:color .2s var(--ease-out)}.practice_paceMarker__IFQoN .practice_paceRow__3IStI strong,.practice_pacePencil__KrRYD .practice_paceRow__3IStI strong{color:color-mix(in srgb,var(--attention) 55%,var(--attention-dark))}.practice_paceToggle__SkcXc{align-items:center;background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);cursor:pointer;display:inline-flex;font:550 var(--step--1) var(--font-sans);justify-content:center;min-height:var(--control-h);min-width:var(--control-h);padding:0 var(--space-3);transition:border-color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_paceToggle__SkcXc:active{transform:scale(.97)}@media (hover:hover){.practice_paceToggle__SkcXc:hover{border-color:var(--ink)}}.practice_paceNote__2Q_oW{color:var(--muted);font:400 var(--step--1)/1.45 var(--font-sans)}.practice_scratchPanel__ToP2a{display:flex;flex-direction:column;gap:var(--space-2)}.practice_scratchTabs__qZCgA{border-bottom:1px solid var(--line);display:flex;gap:var(--space-4)}.practice_scratchTabs__qZCgA button{background:none;border:0;border-bottom:2px solid transparent;color:var(--muted);cursor:pointer;font:500 var(--step--1) var(--font-sans);margin-bottom:-1px;min-height:var(--control-h);padding:0;transition:color .15s var(--ease-out),border-color .15s var(--ease-out)}.practice_scratchTabs__qZCgA button[aria-selected=true]{border-bottom-color:var(--ink);color:var(--ink)}@media (hover:hover){.practice_scratchTabs__qZCgA button:hover{color:var(--ink)}}.practice_page__uVaNJ .scratch-card{display:flex;flex-direction:column;gap:var(--space-1)}.practice_page__uVaNJ .scratch-card textarea{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-md);color:var(--ink);font:400 var(--step--1)/1.6 var(--font-sans);margin-top:var(--space-2);min-height:132px;padding:var(--space-2) var(--space-2-5);resize:vertical;width:100%}.practice_page__uVaNJ .scratch-card textarea:focus-visible{border-color:var(--accent);outline:none}.practice_page__uVaNJ .scratch-card textarea::placeholder{color:var(--muted)}.practice_page__uVaNJ .scratch-card small{color:var(--muted);font:400 var(--step--1) var(--font-sans);min-height:1.4em}.practice_sketchLoading__OVkwv{align-items:center;border:1px dashed var(--line-strong);border-radius:var(--radius-md);color:var(--muted);display:flex;font:400 var(--step--1) var(--font-sans);justify-content:center;min-height:160px}.practice_sketchContextMeta__BZJeW{color:var(--muted);font:500 var(--step--1) var(--font-sans);margin:0}.practice_hintLadder__8Qa7U{display:flex;flex-direction:column;gap:var(--space-2)}.practice_hintLadderHead__FR1fg{align-items:baseline;display:flex;gap:var(--space-2);justify-content:space-between}.practice_hintLadderHead__FR1fg h2{font:600 var(--step-0)/1.3 var(--font-sans);letter-spacing:0;margin:0}.practice_hintLadderHead__FR1fg span{color:var(--muted);font:400 var(--step--1) var(--font-sans)}.practice_hintLadderIntro__lLiHu{color:var(--muted);font:400 var(--step--1)/1.5 var(--font-sans);margin:0}.practice_hintRungs__Px8Ii{counter-reset:none;display:flex;flex-direction:column;list-style:none;margin:var(--space-1) 0 0;padding:0}.practice_hintRungs__Px8Ii>li{border-top:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-2-5) 0}.practice_hintRungs__Px8Ii>li>small{color:var(--muted);font:400 var(--step--1) var(--font-sans)}.practice_hintRungHead__OLHoy{display:flex;flex-direction:column;gap:2px}.practice_hintRungHead__OLHoy>span:first-child{color:var(--ink);font:550 var(--step--1)/1.4 var(--font-sans)}.practice_hintButton___0dNU{align-items:center;align-self:flex-start;background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);cursor:pointer;display:inline-flex;font:550 var(--step--1) var(--font-sans);min-height:var(--control-h);padding:0 var(--space-3);transition:border-color .15s var(--ease-out),transform .16s var(--ease-out)}.practice_hintButton___0dNU:active:not(:disabled){transform:scale(.97)}.practice_hintButton___0dNU:disabled{cursor:not-allowed;opacity:.45}@media (hover:hover){.practice_hintButton___0dNU:hover:not(:disabled){border-color:var(--ink)}}.practice_hintRungBody__Wg6bR{display:flex;flex-direction:column;gap:var(--space-2)}.practice_hintRungBody__Wg6bR p{color:var(--ink-2);font:400 var(--step--1)/1.55 var(--font-sans);margin:0}.practice_hintRungBody__Wg6bR .practice_hintCardsIntro__GxBGY{color:var(--muted)}.practice_hintCards__3bzD8{display:flex;flex-direction:column;list-style:none;margin:0;padding:0}.practice_hintCards__3bzD8 li{border-top:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-1);padding:var(--space-2) 0}.practice_hintCards__3bzD8 li:first-child{border-top:0;padding-top:0}.practice_hintCards__3bzD8 a{color:var(--ink);font-weight:600;margin-top:0}.practice_hintCardStatement__RnbRL{font-size:var(--step--1);overflow-x:auto;padding:2px 0}.practice_hintCards__3bzD8 li p span{color:var(--muted)}.practice_hintCards__3bzD8 li p .problem-statement,.practice_hintInsight__N4IIb .problem-statement{font-family:var(--font-sans)}.practice_hintCards__3bzD8 small{color:var(--muted);font:400 var(--step--1) var(--font-sans)}.practice_hintError__N09He{background:var(--danger-soft);border-radius:var(--radius);color:var(--danger-dark);font:400 var(--step--1)/1.45 var(--font-sans);margin:0;padding:var(--space-2) var(--space-2-5)}.practice_ratingBand__Idgrg{display:block}.practice_conceptTags__RE5vr{align-items:center;display:flex;flex-wrap:wrap;gap:0 var(--space-3)}.practice_conceptTagsLabel___gHh4{flex-basis:100%}.practice_conceptTagActive__YDdU_,.practice_conceptTag__G1kUB{align-items:center;background:none;border:0;color:var(--ink-2);cursor:pointer;display:inline-flex;font:500 var(--step--1) var(--font-sans);min-height:44px;padding:0;text-decoration:underline;text-decoration-color:var(--line-strong);text-decoration-thickness:1px;text-underline-offset:.25em;transition:color .15s var(--ease-out),text-decoration-color .15s var(--ease-out)}.practice_conceptTagActive__YDdU_{color:var(--accent-dark);font-weight:650;text-decoration-color:var(--accent)}@media (hover:hover){.practice_conceptTag__G1kUB:hover{color:var(--ink);text-decoration-color:currentColor}}.practice_conceptTagOverflow__NXVLy,.practice_reportLine__FLpue{color:var(--muted);font:400 var(--step--1) var(--font-sans)}.practice_reportLine__FLpue{align-items:center;display:flex;flex-wrap:wrap;gap:0 var(--space-3)}.practice_reportLine__FLpue button{background:none;border:0;color:var(--muted);cursor:pointer;font:inherit;min-height:var(--control-h);padding:0;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.2em}@media (hover:hover){.practice_reportLine__FLpue button:hover{color:var(--ink)}}.practice_reportForm__H6yuZ{border-top:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-3);max-width:68ch;padding-top:var(--space-4)}.practice_reportForm__H6yuZ fieldset{border:0;display:flex;flex-direction:column;margin:0;min-width:0;padding:0}.practice_reportForm__H6yuZ legend{font:600 var(--step-0) var(--font-sans);margin-bottom:var(--space-2);padding:0}.practice_reportForm__H6yuZ fieldset label{align-items:start;border-top:1px solid var(--line);cursor:pointer;display:grid;gap:var(--space-2-5);grid-template-columns:18px minmax(0,1fr);padding:var(--space-2-5) 0}.practice_reportForm__H6yuZ fieldset label:last-of-type{border-bottom:1px solid var(--line)}.practice_reportForm__H6yuZ fieldset input{accent-color:var(--accent);height:16px;margin:2px 0 0;width:16px}.practice_reportForm__H6yuZ fieldset span{display:flex;flex-direction:column;gap:2px}.practice_reportForm__H6yuZ fieldset strong{font:550 var(--step--1) var(--font-sans)}.practice_reportForm__H6yuZ fieldset small{color:var(--muted);font:400 var(--step--1)/1.45 var(--font-sans)}.practice_reportNote___hQYZ{display:flex;flex-direction:column;gap:var(--space-2)}.practice_reportNote___hQYZ>span{color:var(--muted);font:500 var(--step--1) var(--font-sans)}.practice_reportNote___hQYZ em{font-style:normal}.practice_reportNote___hQYZ textarea{border:1px solid var(--line-strong);border-radius:var(--radius-md);font:400 var(--step--1)/1.5 var(--font-sans);padding:var(--space-2) var(--space-2-5);resize:vertical}.practice_reportNote___hQYZ textarea:focus-visible{border-color:var(--accent)}.practice_reportError__m191t{background:var(--danger-soft);border-radius:var(--radius);color:var(--danger-dark);font:400 var(--step--1) var(--font-sans);margin:0;padding:var(--space-2) var(--space-2-5)}.practice_reportActions__fITE2{display:flex;gap:var(--space-2);justify-content:flex-end}.practice_reportActions__fITE2 button{background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);cursor:pointer;font:550 var(--step--1) var(--font-sans);min-height:var(--control-h);padding:0 var(--space-3);transition:transform .16s var(--ease-out)}.practice_reportActions__fITE2 button:active:not(:disabled){transform:scale(.97)}.practice_reportActions__fITE2 .practice_reportSend__fTFLW{background:var(--ink);border-color:var(--ink);color:var(--white)}.practice_reportActions__fITE2 button:disabled{cursor:not-allowed;opacity:.45}.practice_loadingState__qO057,.practice_statementSkeleton__MDaTo{display:flex;flex-direction:column;gap:var(--space-2-5);max-width:var(--measure-solve)}.practice_loadingState__qO057{color:var(--muted);font:400 var(--step--1) var(--font-sans);padding:var(--space-5) 0}@keyframes practice_skeletonPulse__CWkaK{0%{opacity:.55}to{opacity:1}}.practice_skeletonLine__N_rFF{animation:practice_skeletonPulse__CWkaK 1s var(--ease-in-out) infinite alternate;background:var(--paper-3);border-radius:var(--radius);display:block;height:14px;width:100%}.practice_skeletonLineShort__e___t{width:62%}.practice_emptyState__KILOQ{align-items:flex-start;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-2);max-width:60ch;padding:var(--space-5) 0}.practice_emptyState__KILOQ strong{font:600 var(--step-1)/1.3 var(--font-sans)}.practice_emptyState__KILOQ span{color:var(--ink-2);font:400 var(--step--1)/1.5 var(--font-sans);margin-bottom:var(--space-2)}.practice_focusMode__n55hE .practice_filterPanel__BAsHz,.practice_focusMode__n55hE .practice_filterPanel__BAsHz.practice_filtersOpen__8FEwi,.practice_focusMode__n55hE .practice_filterSummary__CFb2i,.practice_focusMode__n55hE .practice_liveMetrics__3mAnp,.practice_focusMode__n55hE .practice_mobileFilterButton__zB7_y,.practice_focusMode__n55hE .practice_mobileQueueDisclosure__LVOIw,.practice_focusMode__n55hE .practice_modeRow__JZ14N,.practice_focusMode__n55hE .practice_pageHeader__q98fM,.practice_focusMode__n55hE .practice_rail__h2qJG>.practice_conceptTags__RE5vr,.practice_focusMode__n55hE .practice_rail__h2qJG>.practice_ratingBand__Idgrg,.practice_focusMode__n55hE .problem-queue{display:none}.practice_focusMode__n55hE .practice_controlStrip__RQf1h{justify-content:flex-end;padding-top:0}.practice_focusMode__n55hE .practice_rail__h2qJG>.practice_scratchPanel__ToP2a{border-top:0;padding-top:0}@media (max-width:720px){.practice_filterPanel__BAsHz.practice_filtersOpen__8FEwi{max-height:2000px}.practice_modeRow__JZ14N{border-bottom:0;flex-direction:column;gap:0}.practice_modeCurrent__kWl8e,.practice_modeLink__1peYJ{align-items:center;border-bottom:1px solid var(--line);margin-bottom:0;padding-top:0}.practice_modeCurrent__kWl8e:before,.practice_modeLink__1peYJ:before{border:1.5px solid var(--line-strong);border-radius:50%;content:"";flex:none;height:10px;width:10px}.practice_modeCurrent__kWl8e{border-bottom-color:var(--line)}.practice_modeCurrent__kWl8e:before{background:var(--ink);border-color:var(--ink)}.practice_controlStrip__RQf1h{align-items:stretch;flex-direction:column}.practice_filterSummary__CFb2i{flex:none}.practice_controlActions__YNJ5v{flex-wrap:wrap;width:100%}.practice_controlActions__YNJ5v>button{flex:1 1 calc(50% - var(--space-2));justify-content:center;padding:0 var(--space-2)}.practice_page__uVaNJ .practice_problemSheet__NC5nf{padding:var(--space-4) var(--space-3) var(--space-5)}.practice_starLabel__s3N7O{display:none}.practice_starButton__PSnYQ{min-width:var(--control-h);justify-content:center}.practice_sheetFooter__is2QQ .practice_submissionMessage__71lYR{flex-basis:100%}.practice_sheetFooter__is2QQ .practice_skipButton__ZKA6_,.practice_sheetFooter__is2QQ .practice_submitButton__Tctc5{flex:1 1 0}.practice_nextActionButtons__cVOt3>button{flex:1 1 auto}.practice_nextActionButtons__cVOt3>.practice_primaryNext__wuc8C{flex-basis:100%;margin-left:0}}@media (max-width:720px),(pointer:coarse){.practice_filterChips__3dx24 button{min-height:var(--control-h)}.practice_hintCards__3bzD8 a,.practice_hintRungBody__Wg6bR a,.practice_solutionBody__TLK06 a{align-items:center;min-height:var(--control-h)}}@media (prefers-reduced-motion:reduce){.practice_bubble__TRHoc:before{transition:none}.practice_filterPanel__BAsHz.practice_filtersOpen__8FEwi>*,.practice_queuePanel__8FDIx.practice_queueOpen__TYml6>*,.practice_skeletonLine__N_rFF,.practice_solutionPanel__GmRbq{animation:none}}.practice_rangeField__y4jht{border:0;margin:0;min-width:0;padding:0}.practice_rangeInputs__Tecnx{align-items:center;display:flex;gap:var(--space-2)}.practice_rangeInputs__Tecnx input{background:var(--paper);border:1px solid var(--line-strong);border-radius:var(--radius-md);color:var(--ink);font:400 var(--step-0)/1.4 var(--font-sans);font-variant-numeric:tabular-nums;min-height:var(--control-h);padding:var(--space-2) var(--space-2-5);width:5.5rem}.practice_rangeInputs__Tecnx input:focus-visible{border-color:var(--accent);outline:var(--focus-ring);outline-offset:0}.practice_rangeInputs__Tecnx span[aria-hidden]{color:var(--muted);font:500 var(--step--1) var(--font-sans)}.practice_setup__789IB{display:flex;flex-direction:column;gap:var(--space-2)}.practice_setupHead__B57DV{display:flex;flex-direction:column;gap:var(--space-1);padding:var(--space-4) 0 var(--space-2)}.practice_setupHead__B57DV h2{font:600 var(--step-1)/1.25 var(--font-sans);letter-spacing:var(--tracking-normal);margin:0}.practice_setupHead__B57DV h2:focus{outline:none}.practice_setupHead__B57DV p{color:var(--ink-2);font:400 var(--step--1)/1.55 var(--font-sans);margin:0;max-width:68ch}.practice_setupNotice__kF0wi{color:var(--ink);font:500 var(--step--1)/1.5 var(--font-sans);margin:0}.practice_setupNote__azCVc{color:var(--muted);font:400 var(--step--1)/1.5 var(--font-sans);margin:0 0 var(--space-3);max-width:68ch}.practice_filterPrepare__KCyX3{align-items:end}.practice_previewRow__m_JPy{align-items:center;border-bottom:1px solid var(--line);display:grid;gap:var(--space-3);grid-template-columns:28px minmax(0,1fr) auto;min-height:56px;padding:var(--space-2)}.practice_previewLink__9zPeK{color:var(--ink-2);font:500 var(--step--1) var(--font-sans)}.practice_summary__9a09P{display:flex;flex-direction:column;gap:var(--space-4)}.practice_placement__g8YT0{border-bottom:1px solid var(--line);border-top:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-3) 0}.practice_placement__g8YT0 p{color:var(--ink-2);font:400 var(--step-0)/1.55 var(--font-sans);margin:0;max-width:68ch}.practice_placement__g8YT0 strong{color:var(--ink);font-weight:600}a.practice_primaryNext__wuc8C{text-decoration:none}.practice_placementLine__PO1Y8{align-items:baseline;color:var(--ink-2);display:flex;flex-wrap:wrap;font:400 var(--step--1)/1.5 var(--font-sans);gap:0 var(--space-2);margin:0}.practice_placementLine__PO1Y8 strong{color:var(--ink);font-weight:600}.practice_finishConfirm__mhzn9{border-bottom:1px solid var(--line);border-top:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-3);margin-bottom:var(--space-3);padding:var(--space-3) 0}.practice_finishConfirm__mhzn9 p{color:var(--ink);font:500 var(--step--1)/1.5 var(--font-sans);margin:0;max-width:68ch}.practice_filterGroup__Kfg66.practice_kindGroup__x0U5L{grid-template-columns:minmax(0,1fr)}.practice_kindChoices__S50ML{display:grid;gap:var(--space-2);grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.practice_kindChoice__ATJOh{background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);cursor:pointer;display:flex;flex-direction:column;gap:2px;min-height:56px;padding:var(--space-2) var(--space-3);position:relative;transition:border-color .15s var(--ease-out),box-shadow .15s var(--ease-out)}.practice_kindChoice__ATJOh input{height:1px;margin:0;opacity:0;position:absolute;width:1px}.practice_kindChoice__ATJOh:has(input:focus-visible){outline:var(--focus-ring);outline-offset:2px}.practice_kindChoice__ATJOh strong{align-items:center;color:var(--ink);display:inline-flex;font:600 var(--step--1) var(--font-sans);gap:var(--space-2)}.practice_kindChoice__ATJOh strong:before{border:1.5px solid var(--line-strong);border-radius:50%;content:"";flex:none;height:12px;width:12px}.practice_kindChoice__ATJOh small{color:var(--muted);font:400 var(--step--1) var(--font-sans);padding-left:calc(12px + var(--space-2))}.practice_kindChoice__ATJOh[data-checked]{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}.practice_kindChoice__ATJOh[data-checked] strong:before{background:var(--accent);border-color:var(--accent)}@media (hover:hover){.practice_kindChoice__ATJOh:hover{border-color:var(--ink)}}.practice_kindRangeToggle__Y0TwX{display:flex}.practice_rangeEditor__ufCJh{align-items:end;display:grid;gap:var(--space-3) var(--space-4);grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}.practice_rangeEditor__ufCJh .practice_filterNote__PvVXv{grid-column:1/-1}.practice_history__i3dA7{display:flex;flex-direction:column;gap:var(--space-2);margin-top:var(--space-5)}.practice_history__i3dA7 h2{font:600 var(--step-0)/1.3 var(--font-sans);margin:0}.practice_historyRow__6ZGE7{align-items:center;border-bottom:1px solid var(--line);color:var(--ink);display:grid;gap:var(--space-3);grid-template-columns:minmax(0,1fr) auto;min-height:56px;padding:var(--space-2);text-decoration:none;transition:background-color .15s var(--ease-out)}@media (hover:hover){.practice_historyRow__6ZGE7:hover{background:var(--paper-2)}}.practice_reviewRow__PzRRR>summary{cursor:pointer;grid-template-columns:28px minmax(0,1fr) auto;list-style:none}.practice_reviewRow__PzRRR>summary::-webkit-details-marker{display:none}.practice_reviewRow__PzRRR[open]>summary{background:var(--paper-2)}.practice_reviewRow__PzRRR[open]>summary>svg{transform:rotate(180deg)}@media (hover:hover){.practice_reviewRow__PzRRR>summary:hover{background:var(--paper-2)}}.practice_reviewBody__Ao4IE{border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:var(--space-4);padding:var(--space-4) var(--space-2) var(--space-5)}.practice_reviewStatement__TFPyx{font-family:var(--font-math);font-size:var(--step-0);line-height:1.6;max-width:var(--measure-solve);text-wrap:pretty}.practice_reviewStatement__TFPyx .problem-figure{display:block;height:auto;margin:var(--space-3) auto;max-width:100%}.practice_reviewFacts__BVqUQ{display:grid;gap:var(--space-2) var(--space-5);grid-template-columns:repeat(auto-fit,minmax(150px,1fr));margin:0}.practice_reviewFacts__BVqUQ dt{color:var(--muted);font:500 var(--step--1) var(--font-sans)}.practice_reviewFacts__BVqUQ dd{color:var(--ink);font:600 var(--step--1) var(--font-sans);margin:2px 0 0}.practice_reviewWork__ESQju{display:flex;flex-direction:column;gap:var(--space-2)}.practice_reviewWork__ESQju h4{font:600 var(--step--1) var(--font-sans);margin:0}.practice_reviewNotes__PbmDB{background:var(--paper-2);border-radius:var(--radius-md);color:var(--ink);font:400 var(--step--1)/1.6 var(--font-sans);margin:0;max-width:68ch;overflow-wrap:anywhere;padding:var(--space-3);white-space:pre-wrap}.practice_reviewMuted__zcEQi{color:var(--muted);font:400 var(--step--1)/1.5 var(--font-sans);margin:0}.field-select_field__UeWjW{display:flex;flex-direction:column;gap:var(--space-2);min-width:0}.field-select_labelRow__hknZF{align-items:center;display:flex;gap:6px}.field-select_control__Av_27{position:relative}.field-select_trigger__5WW7Q{align-items:center;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);cursor:pointer;display:flex;font:550 var(--step--1) var(--font-sans);justify-content:space-between;min-height:var(--control-h);padding:0 var(--space-2-5);text-align:left;transition:background .15s var(--ease),border-color .15s var(--ease),box-shadow .15s var(--ease),transform .1s var(--ease);width:100%}.field-select_trigger__5WW7Q>span:first-child{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}@media (hover:hover){.field-select_trigger__5WW7Q:hover:not(:disabled){background:var(--white);border-color:var(--line-strong)}}.field-select_trigger__5WW7Q:active:not(:disabled){transform:scale(.97)}.field-select_trigger__5WW7Q:focus-visible,.field-select_trigger__5WW7Q[aria-expanded=true]{background:var(--white);border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 16%,transparent);outline:none}.field-select_trigger__5WW7Q:disabled{cursor:not-allowed;opacity:.5}.field-select_chevron__5UKtD{color:var(--muted);flex:none;margin-left:var(--space-2-5);transition:color .15s var(--ease),transform .18s var(--ease)}.field-select_trigger__5WW7Q[aria-expanded=true] .field-select_chevron__5UKtD{color:var(--accent);transform:rotate(180deg)}@keyframes field-select_listboxReveal__8d5Lh{0%{opacity:0;transform:scale(.96) translateY(-4px)}to{opacity:1;transform:scale(1) translateY(0)}}@keyframes field-select_listboxDismiss__eGMYJ{0%{opacity:1;transform:scale(1) translateY(0)}to{opacity:0;transform:scale(.97) translateY(-3px)}}.field-select_listbox__IXoMC{animation:field-select_listboxReveal__8d5Lh .16s var(--spring-smooth) both;background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius);box-shadow:var(--elevation-3);left:0;list-style:none;min-width:max-content;margin:0;max-height:min(392px,60vh);overflow-y:auto;padding:6px;position:absolute;right:0;top:calc(100% + 6px);transform-origin:top center;z-index:40}.field-select_listboxClosing__0nN8c{animation:field-select_listboxDismiss__eGMYJ .14s var(--spring-snappy) both}.field-select_option__FrhxN{align-items:center;border-radius:calc(var(--radius) - 1px);color:var(--ink);cursor:pointer;display:flex;font:500 var(--step--1) var(--font-sans);gap:8px;min-height:36px;padding:0 12px 0 10px;transition:background .1s var(--ease),color .1s var(--ease),box-shadow .1s var(--ease);white-space:nowrap}.field-select_optionHighlighted__K9FHl{background:var(--paper-2)}.field-select_optionSelected__IPsD7{color:var(--accent);font-weight:650}.field-select_option__FrhxN:active{transform:scale(.98)}.field-select_optionRing___TD_a{align-items:center;border:1.5px solid var(--line-strong);border-radius:50%;display:flex;flex:none;height:14px;justify-content:center;transition:border-color .15s var(--ease);width:14px}.field-select_optionSelected__IPsD7 .field-select_optionRing___TD_a{border-color:var(--accent)}.field-select_optionSelected__IPsD7 .field-select_optionRing___TD_a:after{background:var(--accent);border-radius:50%;content:"";height:6px;width:6px}.mistake-reflection_reflection__Gr5kx{display:flex;flex-direction:column;gap:10px}.mistake-reflection_title__0RmPb{font:600 var(--step--1) var(--font-sans);margin:0}.mistake-reflection_causes__iqKoZ{display:grid;gap:0 var(--space-4);grid-template-columns:repeat(auto-fill,minmax(min(100%,210px),1fr))}.mistake-reflection_causes__iqKoZ label{align-items:center;color:var(--ink-2);cursor:pointer;display:flex;font:500 var(--step--1)/1.3 var(--font-sans);gap:var(--space-2-5);min-height:40px;position:relative}.mistake-reflection_causes__iqKoZ label:before{border:1.5px solid var(--ink-2);border-radius:50%;content:"";flex:none;height:16px;transition:background-color .15s var(--ease-out),border-color .15s var(--ease-out);width:16px}.mistake-reflection_causes__iqKoZ label[data-checked]{color:var(--ink)}.mistake-reflection_causes__iqKoZ label[data-checked]:before{background:var(--accent);border-color:var(--accent)}@media (hover:hover){.mistake-reflection_causes__iqKoZ label:hover:before{border-color:var(--accent)}}.mistake-reflection_causes__iqKoZ input{height:1px;opacity:0;position:absolute;width:1px}.mistake-reflection_causes__iqKoZ label:has(input:focus-visible){outline:var(--focus-ring);outline-offset:var(--focus-offset)}.mistake-reflection_note__hxrOz{display:flex;flex-direction:column;gap:4px}.mistake-reflection_note__hxrOz span{color:var(--muted);font:500 var(--step--1) var(--font-sans)}.mistake-reflection_note__hxrOz small{color:var(--muted);font-size:var(--step--1)}.mistake-reflection_note__hxrOz input{background:var(--white);border:1px solid var(--line-strong);border-radius:var(--radius-md);font:400 var(--step--1) var(--font-sans);min-height:var(--control-h);padding:0 var(--space-2-5)}.mistake-reflection_note__hxrOz input:focus-visible{border-color:var(--accent);outline:2px solid color-mix(in srgb,var(--accent) 30%,transparent)}.mistake-reflection_footer__OMWir{align-items:center;display:flex;flex-wrap:wrap;gap:8px 12px}.mistake-reflection_save__vqDNB{background:var(--ink);border:0;border-radius:var(--radius-md);color:var(--white);cursor:pointer;font:600 var(--step--1) var(--font-sans);min-height:var(--control-h);padding:0 var(--space-3)}.mistake-reflection_save__vqDNB:disabled{background:var(--line-strong);cursor:default}.mistake-reflection_save__vqDNB:active:not(:disabled){transform:scale(.97)}.mistake-reflection_save__vqDNB{transition:transform .16s var(--ease-out)}.mistake-reflection_change__dRRZb:focus-visible,.mistake-reflection_save__vqDNB:focus-visible{outline:var(--focus-ring);outline-offset:var(--focus-offset)}.mistake-reflection_schedule__T4gKS{color:var(--muted);font-size:var(--step--1);line-height:1.5;margin:0}.mistake-reflection_schedule__T4gKS a{color:var(--accent-dark)}.mistake-reflection_savedLine__dTd_R{font-size:var(--step--1);margin:0}.mistake-reflection_savedLine__dTd_R span{color:var(--ink-2)}.mistake-reflection_change__dRRZb{align-self:flex-start;background:none;border:0;color:var(--accent-dark);cursor:pointer;font:500 var(--step--1) var(--font-sans);min-height:var(--control-h);padding:0;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.2em}.mistake-reflection_error__y7lGL{color:var(--danger-dark);font-size:var(--step--1);margin:0}.mistake-reflection_reflection__Gr5kx[data-compact] .mistake-reflection_causes__iqKoZ label{min-height:36px}@media (max-width:720px),(pointer:coarse){.mistake-reflection_causes__iqKoZ label,.mistake-reflection_reflection__Gr5kx[data-compact] .mistake-reflection_causes__iqKoZ label{min-height:var(--control-h)}}.mistake-reflection_tip__QORVH{color:var(--ink-2);font-size:var(--step--1);line-height:1.5;margin:0}.mistake-reflection_tip__QORVH span{color:var(--ink);font-weight:600}