@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2)format("woff2"),url(/assets/KaTeX_AMS-Regular-DMm9YOAa.woff)format("woff"),url(/assets/KaTeX_AMS-Regular-DRggAlZN.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2)format("woff2"),url(/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff)format("woff"),url(/assets/KaTeX_Caligraphic-Bold-ATXxdsX0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2)format("woff2"),url(/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff)format("woff"),url(/assets/KaTeX_Caligraphic-Regular-wX97UBjC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2)format("woff2"),url(/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff)format("woff"),url(/assets/KaTeX_Fraktur-Bold-BdnERNNW.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2)format("woff2"),url(/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff)format("woff"),url(/assets/KaTeX_Fraktur-Regular-CB_wures.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Main-Bold-Cx986IdX.woff2)format("woff2"),url(/assets/KaTeX_Main-Bold-Jm3AIy58.woff)format("woff"),url(/assets/KaTeX_Main-Bold-waoOVXN0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2)format("woff2"),url(/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff)format("woff"),url(/assets/KaTeX_Main-BoldItalic-DzxPMmG6.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2)format("woff2"),url(/assets/KaTeX_Main-Italic-BMLOBm91.woff)format("woff"),url(/assets/KaTeX_Main-Italic-3WenGoN9.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2)format("woff2"),url(/assets/KaTeX_Main-Regular-Dr94JaBh.woff)format("woff"),url(/assets/KaTeX_Main-Regular-ypZvNtVU.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2)format("woff2"),url(/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff)format("woff"),url(/assets/KaTeX_Math-BoldItalic-B3XSjfu4.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2)format("woff2"),url(/assets/KaTeX_Math-Italic-DA0__PXp.woff)format("woff"),url(/assets/KaTeX_Math-Italic-flOr_0UB.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff)format("woff"),url(/assets/KaTeX_SansSerif-Bold-CFMepnvq.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff)format("woff"),url(/assets/KaTeX_SansSerif-Italic-YYjJ1zSn.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff)format("woff"),url(/assets/KaTeX_SansSerif-Regular-BNo7hRIc.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Script-Regular-D3wIWfF6.woff2)format("woff2"),url(/assets/KaTeX_Script-Regular-D5yQViql.woff)format("woff"),url(/assets/KaTeX_Script-Regular-C5JkGWo-.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2)format("woff2"),url(/assets/KaTeX_Size1-Regular-C195tn64.woff)format("woff"),url(/assets/KaTeX_Size1-Regular-Dbsnue_I.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2)format("woff2"),url(/assets/KaTeX_Size2-Regular-oD1tc_U0.woff)format("woff"),url(/assets/KaTeX_Size2-Regular-B7gKUWhC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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)format("woff2"),url(/assets/KaTeX_Size3-Regular-CTq5MqoE.woff)format("woff"),url(/assets/KaTeX_Size3-Regular-DgpXs0kz.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2)format("woff2"),url(/assets/KaTeX_Size4-Regular-BF-4gkZK.woff)format("woff"),url(/assets/KaTeX_Size4-Regular-DWFBv043.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2)format("woff2"),url(/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff)format("woff"),url(/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf)format("truetype")}.katex{text-indent:0;text-rendering:auto;font:1.21em/1.2 KaTeX_Main,Times New Roman,serif;position:relative}.katex *{border-color:currentColor;-ms-high-contrast-adjust:none!important}.katex .katex-version:after{content:"0.18.7"}.katex .katex-mathml{clip-path:inset(50%);border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}.katex .katex-html>.katex-newline{display:block}.katex .katex-base{white-space:nowrap;width:min-content;position:relative}.katex .katex-base,.katex .katex-strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;table-layout:fixed;display:inline-table}.katex .vlist-r{display:table-row}.katex .vlist{vertical-align:bottom;display:table-cell;position:relative}.katex .vlist>span{height:0;display:block;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{width:0;overflow:hidden}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{vertical-align:bottom;width:2px;min-width:2px;font-size:1px;display:table-cell}.katex .katex-vbox{flex-direction:column;align-items:baseline;display:inline-flex}.katex .katex-thinbox{flex-direction:row;width:0;max-width:0;display:inline-flex}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .katex-hdashline,.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-rule,.katex .katex-underline .underline-line,.katex .mfrac .frac-line{min-height:1px}.katex .mspace{display:inline-block}.katex .katex-smash{line-height:0;display:inline}.katex .clap,.katex .llap,.katex .rlap{width:0;position:relative}.katex .clap>.katex-inner,.katex .llap>.katex-inner,.katex .rlap>.katex-inner{position:absolute}.katex .clap>.katex-fix,.katex .llap>.katex-fix,.katex .rlap>.katex-fix{display:inline-block}.katex .llap>.katex-inner{right:0}.katex .clap>.katex-inner,.katex .rlap>.katex-inner{left:0}.katex .clap>.katex-inner>span{margin-left:-50%;margin-right:50%}.katex .katex-rule{border:0 solid;display:inline-block;position:relative}.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-underline .underline-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .katex-hdashline{border-bottom-style:dashed;width:100%;display:inline-block}.katex .sqrt>.katex-root{margin-left:.277778em;margin-right:-.555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .katex-sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .katex-sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .katex-sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .katex-sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .katex-sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .katex-sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .katex-sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .katex-sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .katex-sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .katex-sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .katex-sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .katex-sizing.reset-size2.size1{font-size:.833333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .katex-sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .katex-sizing.reset-size2.size3{font-size:1.16667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .katex-sizing.reset-size2.size4{font-size:1.33333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .katex-sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .katex-sizing.reset-size2.size6{font-size:1.66667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .katex-sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .katex-sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .katex-sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .katex-sizing.reset-size2.size10{font-size:3.45667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .katex-sizing.reset-size2.size11{font-size:4.14667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .katex-sizing.reset-size3.size1{font-size:.714286em}.katex .fontsize-ensurer.reset-size3.size2,.katex .katex-sizing.reset-size3.size2{font-size:.857143em}.katex .fontsize-ensurer.reset-size3.size3,.katex .katex-sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .katex-sizing.reset-size3.size4{font-size:1.14286em}.katex .fontsize-ensurer.reset-size3.size5,.katex .katex-sizing.reset-size3.size5{font-size:1.28571em}.katex .fontsize-ensurer.reset-size3.size6,.katex .katex-sizing.reset-size3.size6{font-size:1.42857em}.katex .fontsize-ensurer.reset-size3.size7,.katex .katex-sizing.reset-size3.size7{font-size:1.71429em}.katex .fontsize-ensurer.reset-size3.size8,.katex .katex-sizing.reset-size3.size8{font-size:2.05714em}.katex .fontsize-ensurer.reset-size3.size9,.katex .katex-sizing.reset-size3.size9{font-size:2.46857em}.katex .fontsize-ensurer.reset-size3.size10,.katex .katex-sizing.reset-size3.size10{font-size:2.96286em}.katex .fontsize-ensurer.reset-size3.size11,.katex .katex-sizing.reset-size3.size11{font-size:3.55429em}.katex .fontsize-ensurer.reset-size4.size1,.katex .katex-sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .katex-sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .katex-sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .katex-sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .katex-sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .katex-sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .katex-sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .katex-sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .katex-sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .katex-sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .katex-sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .katex-sizing.reset-size5.size1{font-size:.555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .katex-sizing.reset-size5.size2{font-size:.666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .katex-sizing.reset-size5.size3{font-size:.777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .katex-sizing.reset-size5.size4{font-size:.888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .katex-sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .katex-sizing.reset-size5.size6{font-size:1.11111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .katex-sizing.reset-size5.size7{font-size:1.33333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .katex-sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .katex-sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .katex-sizing.reset-size5.size10{font-size:2.30444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .katex-sizing.reset-size5.size11{font-size:2.76444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .katex-sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .katex-sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .katex-sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .katex-sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .katex-sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .katex-sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .katex-sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .katex-sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .katex-sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .katex-sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .katex-sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .katex-sizing.reset-size7.size1{font-size:.416667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .katex-sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .katex-sizing.reset-size7.size3{font-size:.583333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .katex-sizing.reset-size7.size4{font-size:.666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .katex-sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .katex-sizing.reset-size7.size6{font-size:.833333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .katex-sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .katex-sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .katex-sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .katex-sizing.reset-size7.size10{font-size:1.72833em}.katex .fontsize-ensurer.reset-size7.size11,.katex .katex-sizing.reset-size7.size11{font-size:2.07333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .katex-sizing.reset-size8.size1{font-size:.347222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .katex-sizing.reset-size8.size2{font-size:.416667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .katex-sizing.reset-size8.size3{font-size:.486111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .katex-sizing.reset-size8.size4{font-size:.555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .katex-sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .katex-sizing.reset-size8.size6{font-size:.694444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .katex-sizing.reset-size8.size7{font-size:.833333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .katex-sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .katex-sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .katex-sizing.reset-size8.size10{font-size:1.44028em}.katex .fontsize-ensurer.reset-size8.size11,.katex .katex-sizing.reset-size8.size11{font-size:1.72778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .katex-sizing.reset-size9.size1{font-size:.289352em}.katex .fontsize-ensurer.reset-size9.size2,.katex .katex-sizing.reset-size9.size2{font-size:.347222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .katex-sizing.reset-size9.size3{font-size:.405093em}.katex .fontsize-ensurer.reset-size9.size4,.katex .katex-sizing.reset-size9.size4{font-size:.462963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .katex-sizing.reset-size9.size5{font-size:.520833em}.katex .fontsize-ensurer.reset-size9.size6,.katex .katex-sizing.reset-size9.size6{font-size:.578704em}.katex .fontsize-ensurer.reset-size9.size7,.katex .katex-sizing.reset-size9.size7{font-size:.694444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .katex-sizing.reset-size9.size8{font-size:.833333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .katex-sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .katex-sizing.reset-size9.size10{font-size:1.20023em}.katex .fontsize-ensurer.reset-size9.size11,.katex .katex-sizing.reset-size9.size11{font-size:1.43981em}.katex .fontsize-ensurer.reset-size10.size1,.katex .katex-sizing.reset-size10.size1{font-size:.24108em}.katex .fontsize-ensurer.reset-size10.size2,.katex .katex-sizing.reset-size10.size2{font-size:.289296em}.katex .fontsize-ensurer.reset-size10.size3,.katex .katex-sizing.reset-size10.size3{font-size:.337512em}.katex .fontsize-ensurer.reset-size10.size4,.katex .katex-sizing.reset-size10.size4{font-size:.385728em}.katex .fontsize-ensurer.reset-size10.size5,.katex .katex-sizing.reset-size10.size5{font-size:.433944em}.katex .fontsize-ensurer.reset-size10.size6,.katex .katex-sizing.reset-size10.size6{font-size:.48216em}.katex .fontsize-ensurer.reset-size10.size7,.katex .katex-sizing.reset-size10.size7{font-size:.578592em}.katex .fontsize-ensurer.reset-size10.size8,.katex .katex-sizing.reset-size10.size8{font-size:.694311em}.katex .fontsize-ensurer.reset-size10.size9,.katex .katex-sizing.reset-size10.size9{font-size:.833173em}.katex .fontsize-ensurer.reset-size10.size10,.katex .katex-sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .katex-sizing.reset-size10.size11{font-size:1.19961em}.katex .fontsize-ensurer.reset-size11.size1,.katex .katex-sizing.reset-size11.size1{font-size:.200965em}.katex .fontsize-ensurer.reset-size11.size2,.katex .katex-sizing.reset-size11.size2{font-size:.241158em}.katex .fontsize-ensurer.reset-size11.size3,.katex .katex-sizing.reset-size11.size3{font-size:.281351em}.katex .fontsize-ensurer.reset-size11.size4,.katex .katex-sizing.reset-size11.size4{font-size:.321543em}.katex .fontsize-ensurer.reset-size11.size5,.katex .katex-sizing.reset-size11.size5{font-size:.361736em}.katex .fontsize-ensurer.reset-size11.size6,.katex .katex-sizing.reset-size11.size6{font-size:.401929em}.katex .fontsize-ensurer.reset-size11.size7,.katex .katex-sizing.reset-size11.size7{font-size:.482315em}.katex .fontsize-ensurer.reset-size11.size8,.katex .katex-sizing.reset-size11.size8{font-size:.578778em}.katex .fontsize-ensurer.reset-size11.size9,.katex .katex-sizing.reset-size11.size9{font-size:.694534em}.katex .fontsize-ensurer.reset-size11.size10,.katex .katex-sizing.reset-size11.size10{font-size:.833601em}.katex .fontsize-ensurer.reset-size11.size11,.katex .katex-sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{width:.12em;display:inline-block}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .katex-accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .katex-accent .accent-body{position:relative}.katex .katex-accent .accent-body:not(.accent-full){width:0}.katex .katex-overlay{display:block}.katex .mtable .vertical-separator{min-width:1px;display:inline-block}.katex .mtable .arraycolsep{display:inline-block}.katex .mtable .col-align-c>.vlist-t{text-align:center}.katex .mtable .col-align-l>.vlist-t{text-align:left}.katex .mtable .col-align-r>.vlist-t{text-align:right}.katex .svg-align{text-align:left}.katex svg{fill:currentColor;stroke:currentColor;height:inherit;width:100%;display:block;position:absolute}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;min-width:0;max-width:none;min-height:0;max-height:none}.katex .katex-stretchy{width:100%;display:block;position:relative;overflow:hidden}.katex .katex-stretchy:after,.katex .katex-stretchy:before{content:""}.katex .hide-tail{width:100%;position:relative;overflow:hidden}.katex .halfarrow-left{width:50.2%;position:absolute;left:0;overflow:hidden}.katex .halfarrow-right{width:50.2%;position:absolute;right:0;overflow:hidden}.katex .brace-left{width:25.1%;position:absolute;left:0;overflow:hidden}.katex .brace-center{width:50%;position:absolute;left:25%;overflow:hidden}.katex .brace-right{width:25.1%;position:absolute;right:0;overflow:hidden}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{box-sizing:border-box;border:.04em solid}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .katex-sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{box-sizing:border-box;border-top:.049em solid;border-right:.049em solid;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .reflectbox{display:inline-block;transform:scaleX(-1)}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{text-align:left;display:inline-block;position:absolute;right:calc(50% + .3em)}.katex .cd-label-right{text-align:right;display:inline-block;position:absolute;left:calc(50% + .3em)}.katex-display{text-align:center;margin:1em 0;display:block}.katex-display>.katex{text-align:center;white-space:nowrap;display:block}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.katex-tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.katex-tag{left:0;right:auto}.katex-display.fleqn>.katex{text-align:left;padding-left:2em}body{counter-reset:katexEqnNo mmlEqnNo}:root{--paper:#f6f0e3;--surface:#fffcf4;--fill:#ece5d6;--fill-2:#e2dac8;--ink:#1c2620;--ink-2:#4f5a55;--ink-3:#667069;--hair:#1b242017;--hair-2:#1b242029;--lift:0 1px 2px #1b24200f, 0 6px 18px -8px #1b242029;--lift-up:0 -1px 2px #1b24200d, 0 -10px 24px -12px #1b242047;--lift-down:0 1px 2px #1b24200d, 0 10px 24px -12px #1b242047;--shadow:0 18px 40px -16px #1b242059;--board:#1b3128;--board-2:#142520;--tone:#f3efe60f;--tone-2:#f3efe61a;--chalk:#f1ecdf;--chalk-2:#f3efe6b8;--chalk-3:#f3efe68f;--line:#f3efe617;--line-2:#f3efe629;--accent:#e3a92b;--accent-ink:#9a6d0a;--accent-soft:#e3a92b33;--on-accent:#1c1405;--ok:#7ccfa0;--ok-ink:#2d7a50;--ok-soft:#2d7a501a;--on-ok:#0b1f17;--warn:#f0937a;--warn-ink:#c4553d;--warn-soft:#c4553d14;--danger:#e5484d;--rec:#c4553d;--note:#f6f1e4;--note-ink:#1c2421;--face:#1f3a2e;--face-2:#13221e;--face-ink:#f1ecdf;--display:"Fraunces", Georgia, serif;--ui:"Hanken Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;--hand:"Caveat", "Comic Sans MS", cursive;--urdu:"Noto Nastaliq Urdu", serif;--mono:ui-monospace, "SF Mono", Menlo, Consolas, monospace;--t-xs:12px;--t-sm:13px;--t-md:15px;--t-lg:17px;--t-xl:20px;--t-2xl:24px;--t-3xl:34px;--s1:4px;--s2:8px;--s3:12px;--s4:16px;--s5:24px;--r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:24px;--r-pill:999px;--safe-t:env(safe-area-inset-top,0px);--safe-b:env(safe-area-inset-bottom,0px);--grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");--slate:var(--grain), radial-gradient(90% 50% at 80% 12%, color-mix(in srgb, var(--chalk) 4%, transparent), transparent 70%), radial-gradient(70% 45% at 10% 80%, color-mix(in srgb, var(--chalk) 2.5%, transparent), transparent 70%), linear-gradient(180deg, var(--board) 0%, var(--board) 70%, var(--board-2) 100%);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--paper);color:var(--ink);font-family:var(--ui);-webkit-font-smoothing:antialiased;overscroll-behavior:none;width:100%;overflow-x:hidden}button{font:inherit;color:inherit;cursor:pointer;background:0 0;border:0;padding:0}button:disabled{cursor:default}button:focus-visible,input:focus-visible{outline:2px solid var(--accent-ink);outline-offset:2px}h1,h2,p{margin:0}.tex{display:inline}.tex-fit{scrollbar-width:none;max-width:100%;padding-block:3px;line-height:1.5;display:block;overflow:auto hidden}.tex-fit::-webkit-scrollbar{display:none}.tex-fit.wrapped .katex{line-height:2.9}.katex{font-size:1.1em}.home{background:radial-gradient(120% 40% at 50% 0%, var(--surface) 0%, var(--paper) 70%);max-width:600px;min-height:100dvh;margin:0 auto}.home-head{justify-content:space-between;align-items:center;gap:var(--s3);padding:calc(var(--s4) + var(--safe-t)) var(--s4) 0;display:flex}.wordmark{align-items:baseline;gap:var(--s2);min-width:0;display:flex}.wordmark .mark{font-family:var(--display);letter-spacing:-.02em;color:var(--ink);font-size:22px;font-weight:700}.wordmark .mark em{color:var(--ink);background:linear-gradient(transparent 66%, var(--accent) 66%, var(--accent) 90%, transparent 90%);padding:0 1px;font-style:normal}.wordmark .urdu{font-family:var(--urdu);color:var(--ink-3);font-size:14px;line-height:1}.pill{font-size:var(--t-xs);color:var(--ink-2);background:var(--fill);border-radius:var(--r-pill);padding:6px var(--s3);flex:none;font-weight:600}.hero{padding:var(--s5) var(--s4) 0}.eyebrow{font-size:var(--t-xs);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin-bottom:var(--s2);font-weight:600}.hero h1{font-family:var(--display);font-weight:600;font-size:clamp(28px, 8.4vw, var(--t-3xl));letter-spacing:-.02em;color:var(--ink);line-height:1.1}.hero h1 em{color:var(--ink);background:linear-gradient(transparent 62%, var(--accent) 62%, var(--accent) 92%, transparent 92%);-webkit-box-decoration-break:clone;box-decoration-break:clone;margin:0 -.04em;padding:0 .08em;font-style:italic}.teacher-card{margin-top:var(--s5);align-items:center;gap:var(--s3);padding:0;display:flex}.tc-text{gap:2px;min-width:0;display:grid}.tc-text b{font-size:var(--t-md);align-items:center;gap:var(--s2);font-weight:600;display:flex}.tc-text span{font-size:var(--t-sm);color:var(--ink-2);line-height:1.4}.online{background:#5fbf8a;border-radius:50%;width:8px;height:8px;display:inline-block;box-shadow:0 0 0 3px #5fbf8a33}.shelf{padding:var(--s5) var(--s4) 0}.shelf-h{font-size:var(--t-xs);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin-bottom:var(--s3);font-weight:600}.minis{gap:var(--s3);scroll-snap-type:x mandatory;scroll-padding-inline:var(--s4);margin:0 calc(-1 * var(--s4));padding:0 var(--s4) var(--s4);scrollbar-width:none;grid-auto-columns:min(76%,280px);grid-auto-flow:column;display:grid;overflow-x:auto}.minis::-webkit-scrollbar{display:none}.mini{scroll-snap-align:start;text-align:left;border-radius:var(--r-lg);padding:var(--s3) var(--s4) var(--s4);align-content:space-between;gap:var(--s3);min-height:104px;color:var(--chalk);background:var(--slate);background-blend-mode:overlay, normal, normal, normal;background-size:160px 160px,auto,auto,auto;transition:transform .2s cubic-bezier(.34,1.56,.64,1),box-shadow .2s;display:grid;box-shadow:0 1px 2px #1b24201f,0 10px 22px -12px #13221e8c}.mini:active{transform:scale(.97);box-shadow:0 1px 2px #1b24201f,0 4px 10px -6px #13221e80}.mini-top{justify-content:space-between;align-items:baseline;gap:var(--s2);display:flex}.mini-top b{font-size:var(--t-sm);color:var(--chalk-2);font-weight:600}.mini-top small{font-family:var(--hand);color:var(--accent);white-space:nowrap;font-size:18px;font-weight:700}.mini-math{font-size:var(--t-lg);min-width:0}.recent{gap:var(--s2);flex-wrap:wrap;display:flex}.recent-chip{min-height:40px;padding:0 var(--s4);border-radius:var(--r-pill);background:var(--fill);color:var(--ink);font-size:var(--t-sm);align-items:center;gap:6px;display:inline-flex}.recent-chip b{font-weight:600}.recent-chip svg{color:var(--ok-ink)}.finder{z-index:5;gap:var(--s2);padding:calc(var(--s3) + var(--safe-t)) var(--s4) var(--s3);margin-top:var(--s2);background:color-mix(in srgb, var(--paper) 92%, transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--hair);align-items:center;display:flex;position:sticky;top:0}.tabs{scrollbar-width:none;background:var(--fill);border-radius:var(--r-md);flex:1;gap:2px;min-width:0;padding:3px;display:flex;overflow-x:auto}.tabs::-webkit-scrollbar{display:none}.tabs button{min-width:44px;height:36px;padding:0 var(--s2);font-weight:600;font-size:var(--t-md);color:var(--ink-2);border-radius:9px;flex:1 0 auto;transition:background .15s,color .15s,box-shadow .15s}.tabs button.on{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px #1b24201a,0 2px 8px -2px #1b24201f}.jump{align-items:center;gap:var(--s1);height:42px;padding:0 var(--s3);border-radius:var(--r-md);background:var(--surface);box-shadow:inset 0 0 0 1px var(--hair-2);font-weight:600;font-size:var(--t-sm);color:var(--ink-3);flex:none;display:flex}.jump input{width:22px;font:600 16px var(--ui);color:var(--ink);background:0 0;border:0;outline:none;padding:0}.jump input::placeholder{color:var(--ink-3)}.jump:focus-within{box-shadow:inset 0 0 0 1.5px var(--accent-ink)}.jump-miss{padding:var(--s2) var(--s4) 0;font-size:var(--t-sm);color:var(--warn-ink)}.qsection{padding:var(--s4) var(--s4) var(--s2)}.qs-head{justify-content:space-between;align-items:baseline;column-gap:var(--s3);flex-wrap:wrap;row-gap:2px;display:flex}.qs-head h2{font-family:var(--display);font-weight:600;font-size:var(--t-2xl);letter-spacing:-.01em}.qs-head span{font-size:var(--t-sm);color:var(--ink-3);white-space:nowrap;font-variant-numeric:tabular-nums;font-weight:500}.qlist{margin:0;padding:0;list-style:none}.qlist .instr{font-size:var(--t-sm);color:var(--ink-2);margin:var(--s3) 0 var(--s1);line-height:1.45}.qrow+.qrow button{border-top:1px solid var(--hair)}.qrow button{align-items:center;gap:var(--s3);width:100%;min-height:64px;padding:var(--s3) 0;text-align:left;color:var(--ink);grid-template-columns:44px minmax(0,1fr) 16px;transition:background .2s;display:grid}.qrow button:active{background:var(--surface)}.qrow.flash button{animation:1.2s flash}.qnum{border-radius:var(--r-md);height:40px;font-weight:600;font-size:var(--t-sm);color:var(--ink-2);background:var(--fill);place-items:center;display:grid;position:relative}.qnum.solved{background:var(--ok-soft);color:var(--ok-ink)}.qtick{background:var(--ok-ink);color:#fff;width:16px;height:16px;box-shadow:0 0 0 2px var(--paper);border-radius:50%;place-items:center;display:grid;position:absolute;top:-4px;right:-4px}.qmath{min-width:0;padding-right:var(--s2);font-size:16px;-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 12px),#0000);mask-image:linear-gradient(90deg,#000 calc(100% - 12px),#0000)}.qgo{color:var(--ink-3)}.home-foot{text-align:center;font-size:var(--t-xs);color:var(--ink-3);padding:var(--s5) var(--s4) calc(var(--s5) + var(--safe-b))}.call{background:var(--surface);width:100%;max-width:600px;height:100dvh;color:var(--ink);flex-direction:column;margin:0 auto;display:flex;position:relative;overflow:hidden}.topbar{z-index:3;align-items:center;gap:var(--s3);padding:calc(var(--s3) + var(--safe-t)) var(--s4) var(--s3);background:var(--surface);box-shadow:var(--lift-down);order:0;display:flex;position:relative}.stage{order:2}.subs{order:3}.strip{order:4}.controls{order:5}.who{flex:1;min-width:0;line-height:1.25;display:grid}.who b{font-weight:600;font-size:var(--t-lg);white-space:nowrap;align-items:center;gap:var(--s2);color:var(--ink);display:flex}.who span{font-size:var(--t-sm);color:var(--ink-3);white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.live{font-size:var(--t-sm);color:var(--ink-2);background:var(--fill);padding:6px var(--s3);border-radius:var(--r-pill);flex:none;align-items:center;gap:6px;font-weight:600;display:inline-flex}.live i{background:var(--rec);border-radius:50%;width:6px;height:6px;animation:1.6s infinite pulse}.live b{font-variant-numeric:tabular-nums;color:var(--ink);font-weight:600}.live.ended i{background:var(--ok-ink);animation:none}.tally{flex:none;align-items:center;gap:3px;height:16px;display:inline-flex;position:relative}.tally i{background:var(--accent-ink);border-radius:2px;width:2.5px;height:14px;animation:.3s both pop}.tally i.cross{width:26px;height:2.5px;position:absolute;top:7px;left:-3px;transform:rotate(-28deg)}.sound-check{background:var(--fill);width:36px;height:36px;color:var(--ink-2);border-radius:50%;flex:none;place-items:center;display:grid}.sound-check.on{background:var(--accent-soft);color:var(--accent-ink)}.enable-sound{left:50%;bottom:calc(160px + var(--safe-b));z-index:31;align-items:center;gap:var(--s2);width:max-content;max-width:calc(100% - 32px);padding:14px var(--s5);border-radius:var(--r-pill);font-size:var(--t-md);background:var(--accent);color:var(--on-accent);box-shadow:var(--shadow);font-weight:700;animation:.2s both fadein;display:inline-flex;position:absolute;transform:translate(-50%)}.demo-toggle{font-size:var(--t-xs);padding:6px var(--s2);border-radius:var(--r-sm);background:var(--fill);color:var(--ink-2);flex:none;font-weight:600}.demo-toggle.on{background:var(--ink);color:var(--surface)}.avatar{flex:none;position:relative}.avatar svg{width:100%;height:100%;display:block;position:relative;overflow:visible}.avatar-ring{border:2px solid #0000;border-radius:50%;transition:border-color .3s;position:absolute;inset:-4px}.avatar-head{transform-origin:32px 40px;transition:transform .35s cubic-bezier(.34,1.56,.64,1)}.avatar-eyes,.avatar-brows{transition:transform .3s}.mood-speaking .avatar-ring{border-color:var(--accent);animation:1.1s ease-out infinite ring}.mood-listening .avatar-ring{border-color:var(--rec);transform:scale(calc(1 + var(--mic,0) * .28));transition:transform 80ms}.mood-listening .avatar-head{transform:rotate(6deg)}.mood-thinking .avatar-eyes{transform:translate(-2px,-2.5px)}.mood-thinking .avatar-brows{transform:translateY(-1.5px)}.mood-correct .avatar-brows{transform:translateY(-3.5px)}.mood-correct .avatar-ring{border-color:var(--ok-ink)}.mood-wrong .avatar-head{transform:rotate(-5deg)}.avatar:not(.mood-thinking) .avatar-eyes{transform-origin:32px 29px;animation:4.6s infinite blink}.avatar-dots{background:var(--surface);box-shadow:var(--lift);border-radius:10px;gap:2px;padding:4px 5px;display:flex;position:absolute;top:-6px;right:-8px}.avatar-dots i,.dots i{background:var(--ink);border-radius:50%;width:4px;height:4px;animation:.9s infinite dot}.avatar-dots i:nth-child(2),.dots i:nth-child(2){animation-delay:.15s}.avatar-dots i:nth-child(3),.dots i:nth-child(3){animation-delay:.3s}.dots{vertical-align:middle;gap:3px;margin-left:6px;display:inline-flex}.dots i{background:currentColor}.stage{z-index:1;min-height:0;color:var(--chalk);background:var(--slate);background-blend-mode:overlay, normal, normal, normal;background-size:160px 160px,auto,auto,auto;flex:1;display:flex;position:relative}.board-area{flex:1;min-height:0;display:flex;position:relative}.board-area:before{content:"";pointer-events:none;opacity:0;background:radial-gradient(120% 60% at 50% 100%, color-mix(in srgb, var(--ok) 16%, transparent), transparent 70%);transition:opacity .8s ease-out;position:absolute;inset:0}.board-area.done:before{opacity:1}.board{overscroll-behavior:contain;scrollbar-width:none;min-height:0;padding:var(--s2) var(--s4) var(--s5);flex:1;position:relative;overflow-y:auto;-webkit-mask-image:linear-gradient(#000 calc(100% - 28px),#0000);mask-image:linear-gradient(#000 calc(100% - 28px),#0000)}.board::-webkit-scrollbar{display:none}.board .katex{color:inherit}.board-end{height:1px}.problem{z-index:3;margin:0 calc(-1 * var(--s4));padding:var(--s2) var(--s4) var(--s3);background:0 0;transition:padding .25s,background .25s;position:sticky;top:0}.problem.collapsed{background:linear-gradient(180deg, var(--board) 0%, var(--board) 70%, color-mix(in srgb, var(--board) 0%, transparent) 100%)}.problem.collapsed:after{opacity:0}.problem:after{content:"";left:var(--s4);right:var(--s4);background:linear-gradient(90deg, var(--line-2), var(--line) 60%, transparent);height:1px;transition:opacity .25s;position:absolute;bottom:0}.problem-tag{font-size:var(--t-xs);letter-spacing:.08em;text-transform:uppercase;color:var(--chalk-3);margin-bottom:6px;font-weight:600;line-height:1;transition:opacity .2s,font-size .2s,margin .2s;display:block}.problem-math{color:var(--accent);font-size:21px;transition:font-size .25s}.problem.collapsed{padding:var(--s1) var(--s4) var(--s4)}.problem.collapsed .problem-tag{opacity:0;margin:0;font-size:0}.problem.collapsed .problem-math{font-size:16px}.problem.collapsed .tex-fit{white-space:nowrap}.steps{margin:var(--s3) 0 0;padding:0;list-style:none}.step{justify-content:start;align-items:center;column-gap:var(--s2);padding:var(--s1) 0;color:var(--chalk);opacity:.7;grid-template-columns:32px minmax(0,max-content) auto;font-size:20px;transition:opacity .4s,font-size .3s;display:grid}.step.latest{opacity:1;font-size:22px}.step-n{font-family:var(--hand);color:var(--chalk-3);text-align:center;font-size:20px;font-weight:700;line-height:1}.step.mine .step-n{color:var(--accent);font-size:19px}.step-math{min-width:0;padding:2px 0 2px var(--s2);border-left:2px solid #0000;position:relative}.step.latest .step-math{border-left-color:var(--accent)}.step .ink{text-shadow:0 0 1px color-mix(in srgb, var(--chalk) 45%, transparent);clip-path:inset(-6px 100% -6px 0);animation:write var(--reveal,.9s) cubic-bezier(.25, .7, .3, 1) forwards;display:block}.step-math:after{content:"";top:50%;left:var(--s2);background:var(--chalk);width:6px;height:6px;box-shadow:0 0 6px 2px color-mix(in srgb, var(--chalk) 50%, transparent);opacity:0;pointer-events:none;animation:dustdot var(--reveal,.9s) cubic-bezier(.25, .7, .3, 1) forwards;border-radius:50%;margin-top:-3px;position:absolute}.step.hl .ink{background:linear-gradient(transparent 58%, color-mix(in srgb, var(--accent) 28%, transparent) 58%, color-mix(in srgb, var(--accent) 28%, transparent) 92%, transparent 92%);border-radius:3px}.step.st .ink{opacity:.45}.step.st .step-math:before{content:"";background:var(--chalk-2);border-radius:2px;height:2.5px;position:absolute;top:52%;left:6px;right:0;transform:rotate(-1.5deg)}.step.ok{color:var(--ok);opacity:1}.step.ok .step-math{border-left-color:var(--ok);animation:.5s ease-out okflash}.step.bad{color:var(--warn);animation:.3s .1s wobble}.step.bad .step-math{border-left-color:#0000}.step.stale{opacity:.4}.step-mark{font-family:var(--hand);font-size:28px;font-weight:700;line-height:1;animation:.35s .2s both pop}.step-mark.ok{color:var(--ok)}.step-mark.bad{color:var(--warn);font-size:24px}.strike{pointer-events:none;height:0;position:absolute;top:50%;left:6px;right:-4px}.strike i{background:var(--warn);transform-origin:0;border-radius:2px;height:2.6px;animation:.3s ease-out .45s forwards strike;position:absolute;left:0;right:0;transform:rotate(-2.2deg)scaleX(0)}.strike i+i{opacity:.7;animation-name:strike2;animation-delay:.6s;top:5px;left:6%;right:3%;transform:rotate(1.2deg)scaleX(0)}.dust{pointer-events:none;position:absolute;top:50%;left:30%}.dust i{background:var(--chalk);opacity:0;border-radius:50%;width:5px;height:5px;animation:.45s ease-out forwards burst;position:absolute}.dust i:nth-child(odd){background:var(--ok);width:4px;height:4px}.note{margin:var(--s3) var(--s1) var(--s3) 40px;padding:var(--s4) var(--s4) var(--s3);color:var(--note-ink);background:var(--note);border-radius:4px 4px var(--r-md) 4px;transform:rotate(var(--tilt,-1.2deg));animation:.35s cubic-bezier(.34,1.56,.64,1) both stick;position:relative;box-shadow:0 10px 20px -12px #000c}.note:before{content:"";background:color-mix(in srgb, var(--accent) 60%, transparent);width:56px;height:14px;margin-left:-28px;position:absolute;top:-7px;left:50%;transform:rotate(2deg)}.note-pill{top:-9px;right:var(--s3);letter-spacing:.06em;text-transform:uppercase;background:var(--note-ink);color:var(--note);padding:3px var(--s2);border-radius:var(--r-pill);font-size:11px;font-weight:600;position:absolute}.note.closed{padding:var(--s3) var(--s3) var(--s2);margin-top:var(--s2);margin-bottom:var(--s2);opacity:.75}.note.closed p{-webkit-line-clamp:1;-webkit-box-orient:vertical;font-size:17px;display:-webkit-box;overflow:hidden}.note p{font-family:var(--hand);font-size:21px;font-weight:500;line-height:1.15}.slot{column-gap:var(--s2);padding:var(--s3) 0 var(--s1);grid-template-columns:32px minmax(0,1fr);align-items:end;animation:.25s both rise;display:grid}.slot .step-n{color:var(--accent);padding-bottom:6px;font-size:19px}.slot-line{width:min(100%,max(60%,180px));min-height:40px;padding:0 var(--s1) var(--s1) var(--s2);border-bottom:2px dashed var(--chalk-3);color:var(--accent);align-items:flex-end;gap:2px;font-size:22px;display:flex;position:relative}.slot-line .tex-fit{flex:0 auto;min-width:0}.slot-hint{font-family:var(--hand);color:var(--chalk-3);font-size:21px}.caret{background:var(--accent);border-radius:2px;flex:none;width:2.5px;height:26px;margin-bottom:4px;animation:1.06s step-end infinite caret}.slot.checking .slot-line{color:var(--chalk-2);border-bottom-color:var(--chalk-3);animation:1s ease-in-out infinite checking}.slot.v-correct .slot-line{color:var(--ok);border-bottom-color:var(--ok)}.slot.v-wrong .slot-line{color:var(--warn);border-bottom-style:solid;border-bottom-color:var(--warn);animation:.3s wobble}.slot-state{font-size:var(--t-sm);color:var(--chalk-2);padding:6px 0 0 var(--s2);grid-column:2}.numline{margin:var(--s4) 0 var(--s1)}.numline svg{width:100%;height:auto;display:block;overflow:visible}.numline .nl-chalk{stroke:var(--chalk)}.numline .nl-num{font-family:var(--hand);fill:var(--chalk);font-size:16px;font-weight:700}.numline .nl-acc{stroke:var(--accent)}.nl-ray{stroke-dasharray:1;stroke-dashoffset:1px;animation:.4s ease-out .2s forwards draw}.nl-ray-head{opacity:0;animation:.2s .55s forwards fadein}.nl-point{transform-box:view-box;stroke:var(--accent);fill:var(--board);animation:.25s ease-out 50ms forwards pointpop;transform:scale(0)}.nl-point.closed{fill:var(--accent)}.numline figcaption{text-align:center;font-family:var(--hand);color:var(--chalk-2);margin-top:2px;font-size:18px}.stamp{z-index:6;pointer-events:none;white-space:nowrap;font-family:var(--hand);color:var(--ok);text-shadow:0 2px 0 #00000059, 0 0 28px color-mix(in srgb, var(--ok) 40%, transparent);font-size:56px;font-weight:700;animation:.95s ease-out forwards stamp;position:absolute;top:38%;left:50%;transform:translate(-50%,-50%)rotate(-8deg)}.confetti{pointer-events:none;z-index:6;position:absolute;inset:0;overflow:hidden}.confetti i{top:-14px;left:var(--x);background:var(--chalk);opacity:.9;width:7px;height:11px;animation:fall 1.2s var(--d) cubic-bezier(.3, .5, .6, 1) forwards;border-radius:2px;position:absolute}.confetti i:nth-child(3n){background:var(--ok)}.confetti i:nth-child(4n){background:var(--accent);border-radius:50%;width:5px;height:5px}.subs{z-index:3;padding:var(--s3) var(--s4) 0;justify-content:flex-end;gap:var(--s2);background:var(--surface);min-height:76px;box-shadow:var(--lift-up);flex-direction:column;display:flex;position:relative}.sub-teacher{font-size:var(--t-lg);color:var(--ink);-webkit-line-clamp:3;-webkit-box-orient:vertical;font-weight:500;line-height:1.4;display:-webkit-box;overflow:hidden}.sub-teacher span{transition:color .12s}.sub-teacher .now{color:var(--ink);background:color-mix(in srgb, var(--accent) 38%, transparent);box-shadow:0 0 0 2px color-mix(in srgb, var(--accent) 38%, transparent);border-radius:4px}.sub-teacher.muted{color:var(--ink-3)}.sub-student{max-width:88%;font-size:var(--t-md);color:var(--ink-2);text-align:right;padding:0 var(--s3) 0 0;box-shadow:inset -2px 0 0 var(--accent);align-self:flex-end;line-height:1.35;animation:.25s both rise}.sub-student small{font-size:var(--t-xs);color:var(--ink-3);font-weight:600;display:block}.checker{font-family:var(--mono);font-size:var(--t-xs);color:var(--ink-3);align-self:flex-start}.strip{z-index:3;min-height:32px;padding:var(--s2) var(--s4) 0;background:var(--surface);justify-content:center;align-items:center;gap:var(--s2);font-size:var(--t-md);color:var(--ink-3);text-align:center;margin:0;line-height:1.25;transition:color .25s;display:flex;position:relative}.strip b{font-weight:600}.strip svg{vertical-align:-3px}.strip.s-your_turn{color:var(--ink)}.strip.s-your_turn>span{animation:.2s ease-out slideup}.strip.s-your_turn b{color:var(--ink);-webkit-text-decoration:underline 3px var(--accent);text-decoration:underline 3px var(--accent);text-underline-offset:4px}.strip.s-listening{color:var(--ink)}.strip.s-listening .rec-time{color:var(--rec)}.strip.s-checking{color:var(--ink-2)}.strip.s-hint{color:var(--warn-ink)}.strip.s-hint .eq i{background:var(--warn-ink)}.strip.s-done{color:var(--ok-ink);font-weight:600}.rec-time{font-variant-numeric:tabular-nums;font-size:var(--t-sm)}.eq{flex:none;align-items:center;gap:3px;height:16px;display:inline-flex}.eq i{background:var(--accent);border-radius:3px;width:3px;height:16px;transition:transform 60ms linear;transform:scaleY(.25)}.controls{z-index:3;background:var(--surface);align-items:center;gap:var(--s3);padding:var(--s3) var(--s4) calc(var(--s4) + var(--safe-b));grid-template-columns:56px minmax(0,1fr) 56px;display:grid;position:relative}.ctl.round{background:var(--fill);width:56px;height:56px;color:var(--ink);border-radius:50%;place-items:center;transition:background .2s,transform .15s;display:grid}.ctl.round:active{transform:scale(.94)}.ctl.round.on{background:var(--ink);color:var(--surface)}.ctl.round:disabled{opacity:.4}.ctl.end{background:var(--danger);color:#fff;box-shadow:0 8px 18px -10px color-mix(in srgb, var(--danger) 80%, transparent)}.ctl.cancel{height:56px;font-size:var(--t-sm);color:var(--ink-2);border-radius:var(--r-md);background:var(--fill);font-weight:600}.mic{border-radius:var(--r-pill);justify-content:center;align-items:center;gap:var(--s2);height:60px;font-weight:600;font-size:var(--t-lg);touch-action:none;-webkit-user-select:none;user-select:none;background:var(--fill);color:var(--ink-2);transition:background .25s,color .25s,opacity .25s,box-shadow .25s;display:flex;position:relative}.mic:disabled{opacity:1}.mic-ring{border-radius:inherit;pointer-events:none;position:absolute;inset:0}.mic.s-your_turn{background:var(--accent);color:var(--on-accent);box-shadow:0 10px 24px -10px color-mix(in srgb, var(--accent) 90%, transparent);animation:2s ease-in-out infinite breathe}.mic.s-listening{background:var(--rec);color:#fff;opacity:1}.mic.s-listening .mic-ring{box-shadow:0 0 0 calc(var(--lvl,0) * 8px) color-mix(in srgb, var(--rec) 30%, transparent);transition:box-shadow 80ms}.mic.s-listening:after{content:"";left:var(--s5);right:var(--s5);bottom:var(--s2);transform-origin:0;height:3px;transform:scaleX(calc(1 - var(--cap,0)));background:#ffffffd9;border-radius:2px;transition:transform .1s linear;position:absolute}.mic.s-checking{color:var(--ink-2);opacity:1}.mic.s-done{background:var(--ok-ink);color:#fff;opacity:1}.stop-sq{background:#fff;border-radius:3px;width:14px;height:14px}.toast{left:50%;bottom:calc(160px + var(--safe-b));z-index:30;width:max-content;max-width:calc(100% - 32px);padding:10px var(--s4);border-radius:var(--r-md);font-size:var(--t-md);text-align:center;background:var(--surface);color:var(--ink);box-shadow:0 0 0 1px var(--hair), var(--shadow);font-weight:600;animation:2.6s both toast;position:absolute;transform:translate(-50%)}.toast.warn{color:var(--warn-ink);background:#fbede6}.toast.info{color:var(--ink-2)}.scrim{z-index:20;background:#131e1a73;animation:.2s fadein;position:absolute;inset:0}.scrim.soft{background:#131e1a4d}.sheet{z-index:21;padding:var(--s2) var(--s4) calc(var(--s4) + var(--safe-b));background:var(--surface);color:var(--ink);border-radius:var(--r-xl) var(--r-xl) 0 0;box-shadow:var(--lift-up);animation:.24s cubic-bezier(.2,.9,.3,1.05) sheet;position:absolute;bottom:0;left:0;right:0}.sheet.keypad{z-index:4;margin-top:calc(-1 * var(--s4));padding-inline:var(--s3);padding-top:var(--s3);flex:none;order:6;position:relative}.sheet.keypad .sheet-grab,.call.pad-open .subs,.call.pad-open .strip,.call.pad-open .controls{display:none}.sheet-grab{background:var(--hair-2);width:36px;height:4px;margin:0 auto var(--s3);border-radius:2px}.kp-entry-row{align-items:stretch;gap:6px;display:flex}.kp-entry{min-width:0;min-height:52px;padding:0 var(--s3);white-space:pre;background:var(--paper);color:var(--ink);border-radius:var(--r-md);box-shadow:inset 0 0 0 1px var(--hair-2);font:600 20px var(--mono);scrollbar-width:none;flex:1;align-items:center;display:flex;overflow-x:auto}.kp-entry>span{display:inline-block;position:relative}.kp-entry .hole{border:1.5px dashed var(--ink-3);vertical-align:middle;border-radius:4px;width:16px;height:24px;margin:0 2px}.kp-caret{background:var(--accent-ink);border-radius:2px;width:2.5px;height:26px;margin-top:-13px;animation:1.06s step-end infinite caret;position:absolute;top:50%;left:-1px}.kp-end{width:2px;height:26px}.kp-ph{font:500 16px var(--ui);color:var(--ink-3)}.kp-arrow{border-radius:var(--r-md);width:36px;color:var(--ink-2);font-size:26px;line-height:1}.kp-close{border-radius:var(--r-md);width:44px;color:var(--ink-2);place-items:center;display:grid}.kp-chips{margin:var(--s3) 0 var(--s2);grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;display:grid}.kp-chips button{border-radius:var(--r-sm);height:40px;color:var(--ink-2);font-size:var(--t-lg);font-weight:500}.kp-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:6px;display:grid}.kp-grid button{border-radius:var(--r-md);place-items:center;height:52px;font-size:22px;font-weight:500;transition:transform 80ms,background .15s;display:grid}.kp-grid button:active,.kp-chips button:active{background:var(--fill-2);transform:scale(.94)}.kp-grid .num{background:var(--surface);color:var(--ink);box-shadow:0 0 0 1px var(--hair-2), 0 1px 2px #1b242014;font-size:24px;font-weight:600}.kp-grid .op,.kp-grid .del{background:var(--fill);color:var(--ink-2)}.kp-grid .var{background:var(--fill);color:var(--accent-ink);font-family:var(--display);font-size:26px;font-style:italic}.kp-send{width:100%;height:52px;margin-top:var(--s3);border-radius:var(--r-md);justify-content:center;align-items:center;gap:var(--s2);background:var(--accent);color:var(--on-accent);font-size:var(--t-lg);font-weight:600;display:flex}.kp-send:disabled{background:var(--fill);color:var(--ink-2)}.perm{text-align:center;padding-top:var(--s2)}.perm-icon{width:60px;height:60px;margin:var(--s1) auto var(--s3);background:var(--accent-soft);color:var(--accent-ink);border-radius:50%;place-items:center;display:grid}.perm h2{font-family:var(--display);font-weight:600;font-size:var(--t-xl);margin:0 var(--s2) var(--s2);line-height:1.25}.perm p{color:var(--ink-2);font-size:var(--t-md);margin:0 var(--s2) var(--s5);line-height:1.45}.btn-primary{border-radius:var(--r-md);background:var(--accent);width:100%;min-height:52px;color:var(--on-accent);font-weight:600;font-size:var(--t-lg);justify-content:center;align-items:center;gap:var(--s2);display:flex}.btn-ghost{border-radius:var(--r-md);width:100%;min-height:48px;font-weight:600;font-size:var(--t-md);color:var(--ink-2);margin-top:var(--s2)}.finish{z-index:21;padding:44px var(--s4) calc(var(--s4) + var(--safe-b));background:var(--surface);color:var(--ink);border-radius:var(--r-xl) var(--r-xl) 0 0;text-align:center;box-shadow:var(--lift-up);animation:.45s cubic-bezier(.2,.9,.3,1.1) both sheet;position:absolute;bottom:0;left:0;right:0}.finish-badge{background:var(--ok-ink);color:#fff;width:56px;height:56px;box-shadow:0 0 0 6px var(--surface), 0 10px 20px -8px #18704e99;border-radius:50%;place-items:center;margin-left:-28px;animation:.4s .25s both pop;display:grid;position:absolute;top:-28px;left:50%}.finish h2{font-family:var(--display);letter-spacing:-.02em;font-size:28px;font-weight:600}.finish-sub{font-family:var(--hand);color:var(--ok-ink);margin-top:2px;font-size:24px;font-weight:700;line-height:1.2}.finish-stats{margin:var(--s4) 0 var(--s5);padding:var(--s3) 0;border-block:1px solid var(--hair);grid-template-columns:repeat(4,minmax(0,1fr));display:grid}.finish-stats div{gap:var(--s1);align-content:start;display:grid}.finish-stats div+div{border-left:1px solid var(--hair)}.finish-stats dt{font-size:var(--t-xs);color:var(--ink-3);order:2;font-weight:500;line-height:1.2}.finish-stats dd{font-weight:600;font-size:var(--t-xl);font-variant-numeric:tabular-nums;margin:0}.finish .btn-primary small{font-weight:500;font-size:var(--t-sm);opacity:.75}.finish-row{gap:var(--s2);margin-top:var(--s2);grid-template-columns:1fr 1fr;display:grid}.finish .btn-ghost{background:var(--fill);color:var(--ink);margin:0}.call.demo .strip{padding:var(--s1) var(--s4) var(--s3);box-shadow:var(--lift-down);order:1}.call.demo .topbar{box-shadow:none}.call.demo .live-word{display:none}.call.demo .step{opacity:.85;font-size:24px}.call.demo .step.latest{font-size:28px}.call.demo .step.stale{opacity:.7}.call.demo .problem-math{font-size:24px}.call.demo .sub-teacher{font-size:21px}.call.demo .mic{height:72px}.call.demo .slot-line{font-size:26px}.call.demo .strip{font-size:var(--t-lg);min-height:40px}@media (width<=370px){.topbar{gap:10px}.who b{font-size:var(--t-md)}.live{padding:5px 10px}.step{font-size:18px}.step.latest{font-size:20px}.kp-grid button{height:48px}.controls{gap:10px}.finish-stats dd{font-size:18px}}@media (height<=780px){.kp-grid button{height:46px}.kp-chips button{height:36px;margin:0}.kp-chips{margin:var(--s2) 0 6px}.kp-send{height:48px;margin-top:var(--s2)}}@media (height<=700px){.kp-grid button{height:44px}.subs{min-height:56px}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}@keyframes rise{0%{opacity:0;transform:translateY(8px)}}@keyframes flash{0%,to{background:0 0}30%{background:var(--accent-soft)}}@keyframes pop{0%{transform:scale(0)}70%{transform:scale(1.2)}to{transform:scale(1)}}@keyframes ring{0%{box-shadow:0 0 0 0 color-mix(in srgb, var(--accent) 50%, transparent)}to{box-shadow:0 0 0 12px color-mix(in srgb, var(--accent) 0%, transparent)}}@keyframes blink{0%,94%,to{transform:scaleY(1)}97%{transform:scaleY(.1)}}@keyframes dot{0%,to{opacity:.25;transform:translateY(0)}40%{opacity:1;transform:translateY(-2px)}}@keyframes write{to{clip-path:inset(-6px -6px -6px 0)}}@keyframes dustdot{0%{opacity:.9;left:8px}92%{opacity:.9;left:calc(100% - 4px)}to{opacity:0;left:calc(100% - 4px)}}@keyframes okflash{0%{background:var(--ok-soft)}to{background:0 0}}@keyframes wobble{0%,to{transform:translate(0)}25%{transform:translate(-5px)rotate(-.6deg)}50%{transform:translate(4px)rotate(.4deg)}75%{transform:translate(-2px)}}@keyframes strike{to{transform:rotate(-2.2deg)scaleX(1)}}@keyframes strike2{to{transform:rotate(1.2deg)scaleX(1)}}@keyframes draw{to{stroke-dashoffset:0}}@keyframes burst{0%{opacity:1;transform:rotate(var(--a)) translateX(4px)}to{opacity:0;transform:rotate(var(--a)) translateX(34px)}}@keyframes stick{0%{opacity:0;transform:rotate(var(--tilt)) translateY(10px) scale(.96)}}@keyframes caret{0%,50%{opacity:1}50.01%,to{opacity:0}}@keyframes checking{0%,to{opacity:1}50%{opacity:.55}}@keyframes fadein{0%{opacity:0}to{opacity:1}}@keyframes pointpop{0%{transform:scale(0)}70%{transform:scale(1.2)}to{transform:scale(1)}}@keyframes stamp{0%{opacity:0;transform:translate(-50%,-50%)rotate(-8deg)scale(1.5)}14%{opacity:1;transform:translate(-50%,-50%)rotate(-8deg)scale(1)}65%{opacity:1}to{opacity:0;transform:translate(-50%,-62%)rotate(-8deg)scale(1)}}@keyframes fall{0%{opacity:1;transform:translateY(0)rotate(0)}to{transform:translateY(560px) rotate(var(--r));opacity:0}}@keyframes slideup{0%{opacity:.4;transform:translateY(8px)}}@keyframes breathe{0%,to{transform:scale(1)}50%{transform:scale(1.03)}}@keyframes toast{0%{opacity:0;transform:translate(-50%,10px)}8%,88%{opacity:1;transform:translate(-50%)}to{opacity:0;transform:translate(-50%,6px)}}@keyframes sheet{0%{transform:translateY(100%)}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important;animation-delay:0s!important}.step .ink{clip-path:none;animation:none}.step-math:after,.confetti,.dust{display:none}.mic.s-your_turn{animation:none}}
