@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{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.16.38"}.katex .katex-mathml{clip:rect(1px,1px,1px,1px);border:0;height:1px;overflow:hidden;padding:0;position:absolute;width:1px}.katex .katex-html>.newline{display:block}.katex .base{position:relative;white-space:nowrap;width:-webkit-min-content;width:-moz-min-content;width:min-content}.katex .base,.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;display:inline-table;table-layout:fixed}.katex .vlist-r{display:table-row}.katex .vlist{display:table-cell;position:relative;vertical-align:bottom}.katex .vlist>span{display:block;height:0;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{overflow:hidden;width:0}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{display:table-cell;font-size:1px;min-width:2px;vertical-align:bottom;width:2px}.katex .vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .hbox{width:100%}.katex .hbox,.katex .thinbox{display:inline-flex;flex-direction:row}.katex .thinbox{max-width:0;width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .hdashline,.katex .hline,.katex .mfrac .frac-line,.katex .overline .overline-line,.katex .rule,.katex .underline .underline-line{min-height:1px}.katex .mspace{display:inline-block}.katex .smash{display:inline;line-height:0}.katex .clap,.katex .llap,.katex .rlap{position:relative;width:0}.katex .clap>.inner,.katex .llap>.inner,.katex .rlap>.inner{position:absolute}.katex .clap>.fix,.katex .llap>.fix,.katex .rlap>.fix{display:inline-block}.katex .llap>.inner{right:0}.katex .clap>.inner,.katex .rlap>.inner{left:0}.katex .clap>.inner>span{margin-left:-50%;margin-right:50%}.katex .rule{border:0 solid;display:inline-block;position:relative}.katex .hline,.katex .overline .overline-line,.katex .underline .underline-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.root{margin-left:.2777777778em;margin-right:-.5555555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .sizing.reset-size2.size1{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .sizing.reset-size2.size3{font-size:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .sizing.reset-size2.size4{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .sizing.reset-size2.size6{font-size:1.6666666667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .sizing.reset-size2.size10{font-size:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .sizing.reset-size3.size2{font-size:.8571428571em}.katex .fontsize-ensurer.reset-size3.size3,.katex .sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .sizing.reset-size3.size4{font-size:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .sizing.reset-size3.size11{font-size:3.5542857143em}.katex .fontsize-ensurer.reset-size4.size1,.katex .sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .sizing.reset-size5.size1{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .sizing.reset-size5.size4{font-size:.8888888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .sizing.reset-size5.size6{font-size:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .sizing.reset-size5.size7{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .sizing.reset-size5.size10{font-size:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .sizing.reset-size5.size11{font-size:2.7644444444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .sizing.reset-size7.size1{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .sizing.reset-size7.size3{font-size:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .sizing.reset-size7.size4{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .sizing.reset-size7.size6{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .sizing.reset-size7.size10{font-size:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .sizing.reset-size8.size4{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .sizing.reset-size8.size6{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .sizing.reset-size8.size7{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .sizing.reset-size8.size10{font-size:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .sizing.reset-size9.size8{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .sizing.reset-size9.size10{font-size:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .sizing.reset-size10.size9{font-size:.8331726133em}.katex .fontsize-ensurer.reset-size10.size10,.katex .sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .sizing.reset-size10.size11{font-size:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .sizing.reset-size11.size10{font-size:.8336012862em}.katex .fontsize-ensurer.reset-size11.size11,.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{display:inline-block;width:.12em}.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 .accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .accent .accent-body{position:relative}.katex .accent .accent-body:not(.accent-full){width:0}.katex .overlay{display:block}.katex .mtable .vertical-separator{display:inline-block;min-width:1px}.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;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;max-height:none;max-width:none;min-height:0;min-width:0}.katex .stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .stretchy:after,.katex .stretchy:before{content:""}.katex .hide-tail{overflow:hidden;position:relative;width:100%}.katex .halfarrow-left{left:0;overflow:hidden;position:absolute;width:50.2%}.katex .halfarrow-right{overflow:hidden;position:absolute;right:0;width:50.2%}.katex .brace-left{left:0;overflow:hidden;position:absolute;width:25.1%}.katex .brace-center{left:25%;overflow:hidden;position:absolute;width:50%}.katex .brace-right{overflow:hidden;position:absolute;right:0;width:25.1%}.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{border:.04em solid;box-sizing:border-box}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{border-right:.049em solid;border-top:.049em solid;box-sizing:border-box;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.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{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}.precalc-tool{--pt-bg: #fafaf8;--pt-surface: #ffffff;--pt-border: #e5e3de;--pt-text: #1a1917;--pt-text-muted: #6b6864;--pt-text-faint: #9c9994;--pt-accent: #2563eb;--pt-accent-light: #eff6ff;--pt-accent-border: #bfdbfe;--pt-chapter-bg: #f4f3f0;--pt-shadow-sm: 0 1px 3px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.04);--pt-shadow: 0 2px 8px rgba(0,0,0,.09), 0 1px 3px rgba(0,0,0,.05);--pt-shadow-lg: 0 8px 24px rgba(0,0,0,.12), 0 2px 8px rgba(0,0,0,.06);--pt-radius: 10px;--pt-sidebar-w: 236px;--pt-font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--pt-font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;display:flex;flex-direction:column;height:100%;font-family:var(--pt-font-sans);background:var(--pt-bg);color:var(--pt-text);-webkit-font-smoothing:antialiased;box-sizing:border-box;line-height:1.5}.precalc-tool *,.precalc-tool *:before,.precalc-tool *:after{box-sizing:border-box;margin:0;padding:0}.pt-header{display:flex;align-items:center;flex-wrap:wrap;gap:10px;background:var(--pt-surface);border-bottom:1px solid var(--pt-border);box-shadow:var(--pt-shadow-sm);position:sticky;top:0;z-index:200;padding:10px 16px}.pt-menu-btn{width:36px;height:36px;border-radius:8px;border:1px solid var(--pt-border);background:transparent;cursor:pointer;font-size:16px;color:var(--pt-text-muted);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s,color .15s}.pt-menu-btn:hover{background:var(--pt-chapter-bg);color:var(--pt-text)}.pt-header-title{flex:1;min-width:0}.pt-header-title h1{font-size:15px;font-weight:700;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pt-header-subtitle{font-size:11px;color:var(--pt-text-faint)}.pt-search-input{height:36px;padding:0 14px;border-radius:8px;border:1px solid var(--pt-border);background:var(--pt-bg);font-size:14px;color:var(--pt-text);outline:none;transition:border-color .15s,box-shadow .15s;width:100%;order:10;font-family:var(--pt-font-sans)}.pt-search-input:focus{border-color:var(--pt-accent);box-shadow:0 0 0 3px #2563eb1f}.pt-tab-bar{display:flex;align-items:center;gap:4px;padding:6px 16px;background:var(--pt-surface);border-bottom:1px solid var(--pt-border);box-shadow:var(--pt-shadow-sm);flex-shrink:0}.pt-tab-btn{display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 14px;border-radius:7px;border:1px solid transparent;background:transparent;font-size:13px;font-weight:500;color:var(--pt-text-muted);cursor:pointer;transition:all .14s;font-family:var(--pt-font-sans)}.pt-tab-btn:hover{background:var(--pt-chapter-bg);color:var(--pt-text)}.pt-tab-btn.active{background:var(--pt-accent-light);border-color:var(--pt-accent-border);color:var(--pt-accent);font-weight:700}.pt-chapter-label-bar{display:flex;align-items:center;justify-content:space-between;padding:6px 0;font-size:12px;font-weight:600;color:var(--pt-text-muted);min-height:36px;gap:8px;margin-bottom:12px;border-bottom:1px solid var(--pt-border)}.pt-clear-filter{background:none;border:none;cursor:pointer;font-size:11px;color:var(--pt-accent);padding:2px 6px;border-radius:4px;white-space:nowrap;font-family:var(--pt-font-sans)}.pt-clear-filter:hover{background:var(--pt-accent-light)}.pt-body{display:flex;flex:1;overflow:hidden;position:relative}.pt-sidebar-desktop{width:var(--pt-sidebar-w);flex-shrink:0;background:var(--pt-surface);border-right:1px solid var(--pt-border);overflow-y:auto;display:none}.pt-sidebar-nav{display:flex;flex-direction:column;gap:2px;padding:10px 8px}.pt-sidebar-tabs{display:flex;gap:4px;padding:8px 4px 4px;border-bottom:1px solid var(--pt-border);margin-bottom:6px}.pt-sidebar-tab-btn{flex:1;height:30px;display:inline-flex;align-items:center;justify-content:center;gap:5px;border-radius:7px;border:1px solid transparent;background:transparent;font-size:11.5px;font-weight:500;color:var(--pt-text-muted);cursor:pointer;transition:all .13s;white-space:nowrap;font-family:var(--pt-font-sans)}.pt-sidebar-tab-btn:hover{background:var(--pt-chapter-bg);color:var(--pt-text)}.pt-sidebar-tab-btn.active{background:var(--pt-accent-light);border-color:var(--pt-accent-border);color:var(--pt-accent);font-weight:700}.pt-chapter-btn{display:flex;align-items:center;gap:8px;width:100%;text-align:left;padding:8px 10px;border-radius:8px;border:none;background:transparent;cursor:pointer;font-size:12.5px;color:var(--pt-text-muted);transition:background .12s,color .12s;font-family:var(--pt-font-sans)}.pt-chapter-btn:hover{background:var(--pt-chapter-bg);color:var(--pt-text)}.pt-chapter-btn.active{background:var(--pt-accent-light);color:var(--pt-accent);font-weight:600}.pt-ch-num{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;border-radius:50%;background:var(--pt-chapter-bg);font-size:10.5px;font-weight:700;color:var(--pt-text-muted);flex-shrink:0}.pt-chapter-btn.active .pt-ch-num{background:var(--pt-accent-border);color:var(--pt-accent)}.pt-chapter-btn-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pt-count{margin-left:auto;flex-shrink:0;font-size:10px;color:var(--pt-text-faint);background:var(--pt-chapter-bg);border-radius:10px;padding:1px 6px}.pt-chapter-btn.active .pt-count{background:var(--pt-accent-border);color:var(--pt-accent)}.pt-folder-item{display:flex;flex-direction:column}.pt-folder-btn{display:flex;align-items:center;gap:0;padding:0;border-radius:8px;overflow:hidden;width:100%}.pt-folder-btn.active{background:var(--pt-accent-light)}.pt-folder-chevron{flex-shrink:0;width:24px;height:34px;display:inline-flex;align-items:center;justify-content:center;border:none;background:transparent;cursor:pointer;font-size:11px;color:var(--pt-text-faint);transition:color .12s;padding:0}.pt-folder-chevron:hover{color:var(--pt-text)}.pt-folder-label-btn{flex:1;min-width:0;display:flex;align-items:center;gap:7px;border:none;background:transparent;cursor:pointer;font-size:12.5px;color:var(--pt-text-muted);text-align:left;padding:8px 8px 8px 0;transition:color .12s;font-family:var(--pt-font-sans)}.pt-folder-label-btn:hover{color:var(--pt-text)}.pt-folder-btn.active .pt-folder-label-btn{color:var(--pt-accent);font-weight:600}.pt-folder-btn.active .pt-ch-num,.pt-folder-btn.active .pt-count{background:var(--pt-accent-border);color:var(--pt-accent)}.pt-folder-formulas{display:flex;flex-direction:column;padding:3px 0 5px 32px;gap:1px;border-left:2px solid var(--ch-color, var(--pt-accent-border));margin:0 0 4px 12px}.pt-folder-formula-link{font-size:11.5px;color:var(--pt-text-faint);text-decoration:none;padding:3px 8px;border-radius:5px;line-height:1.35;transition:background .12s,color .12s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pt-folder-formula-link:hover{background:var(--pt-chapter-bg);color:var(--pt-text-muted)}.pt-drawer-backdrop{position:fixed;inset:0;background:#00000059;z-index:300;animation:ptFadeIn .18s ease}@keyframes ptFadeIn{0%{opacity:0}to{opacity:1}}.pt-drawer-mobile{position:fixed;top:0;left:0;bottom:0;width:min(80vw,300px);background:var(--pt-surface);z-index:400;box-shadow:var(--pt-shadow-lg);display:flex;flex-direction:column;transform:translate(-100%);transition:transform .22s cubic-bezier(.4,0,.2,1)}.pt-drawer-mobile.open{transform:translate(0)}.pt-drawer-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--pt-border);flex-shrink:0}.pt-drawer-title{font-size:15px;font-weight:700;color:var(--pt-text)}.pt-drawer-close{width:30px;height:30px;border-radius:6px;border:1px solid var(--pt-border);background:transparent;cursor:pointer;font-size:14px;color:var(--pt-text-muted);display:flex;align-items:center;justify-content:center}.pt-drawer-close:hover{background:var(--pt-chapter-bg)}.pt-drawer-body{flex:1;overflow-y:auto}.pt-main-content{flex:1;overflow-y:auto;padding:24px 20px 40px;min-width:0}.pt-flashcards-main{background:var(--pt-bg)}.pt-chapter-section{margin-bottom:8px}.pt-chapter-heading{display:flex;align-items:baseline;flex-wrap:wrap;gap:10px;margin-bottom:16px;padding-bottom:10px;border-bottom:2px solid var(--pt-border)}.pt-folder-heading{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:10px 14px;border-radius:var(--pt-radius);border:1px solid var(--pt-border);background:var(--pt-surface);cursor:pointer;transition:background .13s,border-color .13s;border-left:4px solid var(--ch-color, var(--pt-accent));margin-bottom:0;font-family:var(--pt-font-sans)}.pt-folder-heading:hover{background:var(--pt-chapter-bg);border-color:#d1cfc9}.pt-folder-heading[aria-expanded=true]{margin-bottom:12px}.pt-folder-heading-icon{font-size:13px;color:var(--pt-text-faint);flex-shrink:0;width:14px;text-align:center}.pt-chapter-num-badge{font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--ch-color, var(--pt-accent));background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 10%,white);border:1px solid color-mix(in srgb,var(--ch-color, var(--pt-accent)) 25%,white);padding:2px 8px;border-radius:6px;white-space:nowrap;flex-shrink:0}.pt-chapter-title{font-size:16px;font-weight:700;color:var(--pt-text);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;align-self:center}.pt-chapter-count{margin-left:auto;font-size:11px;color:var(--pt-text-faint);white-space:nowrap}.pt-folder-controls{display:flex;gap:8px;margin-bottom:16px;align-items:center}.pt-folder-ctrl-btn{height:28px;padding:0 11px;border-radius:6px;border:1px solid var(--pt-border);background:var(--pt-surface);font-size:11.5px;font-weight:500;color:var(--pt-text-muted);cursor:pointer;transition:all .12s;font-family:var(--pt-font-sans)}.pt-folder-ctrl-btn:hover{background:var(--pt-chapter-bg);color:var(--pt-text);border-color:#c0bebc}.pt-search-results-header{font-size:13px;color:var(--pt-text-muted);margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid var(--pt-border)}.pt-formula-grid{display:grid;grid-template-columns:1fr;gap:14px}.pt-formula-card{background:var(--pt-surface);border:1px solid var(--pt-border);border-radius:var(--pt-radius);box-shadow:var(--pt-shadow-sm);overflow:hidden;transition:box-shadow .15s,border-color .15s}.pt-formula-card:hover{box-shadow:var(--pt-shadow);border-color:#d1cfc9}.pt-formula-header{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;padding:10px 12px 8px;background:var(--pt-chapter-bg);border-bottom:1px solid var(--pt-border)}.pt-formula-meta{display:flex;flex-direction:column;gap:3px}.pt-formula-chapter-badge{font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--pt-accent)}.pt-formula-name{font-size:12.5px;font-weight:600;color:var(--pt-text);line-height:1.3}.pt-formula-display{padding:16px 18px;min-height:64px;display:flex;align-items:center;justify-content:center;overflow-x:auto;background:var(--pt-surface);-webkit-overflow-scrolling:touch}.pt-formula-display .katex{font-size:1.12em}.pt-formula-display .katex-display{margin:0!important}.pt-format-bar{display:flex;align-items:center;gap:6px;padding:7px 10px;background:var(--pt-chapter-bg);border-top:1px solid var(--pt-border)}.pt-format-tabs{display:flex;gap:3px;flex:1}.pt-fmt-tab{height:26px;padding:0 10px;border-radius:5px;border:1px solid var(--pt-border);background:var(--pt-surface);font-size:11px;font-weight:600;color:var(--pt-text-muted);cursor:pointer;transition:all .13s;white-space:nowrap;font-family:var(--pt-font-sans)}.pt-fmt-tab:hover{border-color:#c0bebc;color:var(--pt-text);background:#f0eeeb}.pt-fmt-tab.active.pt-latex-tab{background:var(--pt-accent-light);border-color:var(--pt-accent-border);color:var(--pt-accent)}.pt-fmt-tab.active.pt-word-tab{background:#f0fdf4;border-color:#a7f3d0;color:#15803d}.pt-copy-action-btn{height:26px;padding:0 11px;border-radius:5px;border:1px solid var(--pt-border);background:var(--pt-text);color:var(--pt-surface);font-size:11px;font-weight:600;cursor:pointer;transition:all .13s;white-space:nowrap;flex-shrink:0;font-family:var(--pt-font-sans)}.pt-copy-action-btn:hover{background:#333}.pt-copy-action-btn.ok{background:#16a34a;border-color:#16a34a;color:#fff}.pt-copy-action-btn.err{background:#dc2626;border-color:#dc2626;color:#fff}.pt-formula-code-block{padding:8px 12px;background:#f6f5f2;border-top:1px solid var(--pt-border);cursor:text;user-select:text;-webkit-user-select:text;overflow-x:auto;-webkit-overflow-scrolling:touch;max-height:90px;transition:background .12s}.pt-formula-code-block:hover{background:#efeee9}.pt-formula-code-block.mathml{max-height:72px}.pt-formula-code-block code{font-family:var(--pt-font-mono);font-size:11px;color:#4a4845;word-break:break-all;white-space:pre-wrap;display:block;line-height:1.5}.pt-formula-code-block.latex code{color:#1e40af}.pt-formula-code-block.mathml code{color:#5b6f5a}.pt-mathml-hint{font-size:10.5px;color:var(--pt-text-faint);line-height:1.5;padding:5px 12px 7px;background:#fafaf8;border-top:1px solid var(--pt-border)}.pt-mathml-hint strong{color:var(--pt-text-muted);font-weight:600}.pt-format-guide{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:12px 14px;margin-bottom:20px;font-size:13px;color:#78350f;line-height:1.5}.pt-guide-content{display:flex;align-items:flex-start;gap:10px;flex:1;min-width:0}.pt-guide-icon{font-size:16px;flex-shrink:0;margin-top:1px}.pt-guide-text{flex:1;min-width:0}.pt-guide-tag{display:inline-block;font-size:10.5px;font-weight:700;padding:1px 6px;border-radius:4px;vertical-align:middle}.pt-guide-tag.latex{background:var(--pt-accent-light);border:1px solid var(--pt-accent-border);color:var(--pt-accent)}.pt-guide-tag.word{background:#f0fdf4;border:1px solid #d1fae5;color:#16a34a}.pt-guide-dismiss{flex-shrink:0;background:none;border:none;cursor:pointer;font-size:13px;color:#a16207;padding:2px 4px;border-radius:4px;line-height:1;margin-top:1px}.pt-guide-dismiss:hover{background:#fef3c7}.pt-empty-state{padding:64px 20px;text-align:center;color:var(--pt-text-muted)}.pt-empty-icon{font-size:36px;margin-bottom:12px;opacity:.4}.pt-empty-state p{font-size:15px;margin-bottom:16px}.pt-clear-filter-btn{display:inline-flex;align-items:center;padding:8px 16px;border-radius:8px;border:1px solid var(--pt-accent-border);background:var(--pt-accent-light);color:var(--pt-accent);font-size:13px;font-weight:500;cursor:pointer;font-family:var(--pt-font-sans)}.pt-clear-filter-btn:hover{background:#dbeafe}.precalc-tool ::-webkit-scrollbar{width:5px;height:5px}.precalc-tool ::-webkit-scrollbar-track{background:transparent}.precalc-tool ::-webkit-scrollbar-thumb{background:#d5d3ce;border-radius:999px}.precalc-tool ::-webkit-scrollbar-thumb:hover{background:#b5b3ae}.precalc-tool .fc-page{max-width:680px;margin:0 auto;padding:24px 20px 48px;display:flex;flex-direction:column;align-items:stretch}.precalc-tool .fc-controls{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:16px}.precalc-tool .fc-controls-left{display:flex;align-items:center;flex-wrap:wrap;gap:7px;flex:1}.precalc-tool .fc-controls-right{flex-shrink:0}.precalc-tool .fc-keyboard-hint{font-size:10.5px;color:var(--pt-text-faint);white-space:nowrap}.precalc-tool .fc-chapter-select{height:32px;padding:0 10px;border-radius:7px;border:1px solid var(--pt-border);background:var(--pt-surface);font-size:12.5px;color:var(--pt-text);cursor:pointer;outline:none;max-width:240px;font-family:var(--pt-font-sans)}.precalc-tool .fc-chapter-select:focus{border-color:var(--pt-accent);box-shadow:0 0 0 3px #2563eb1a}.precalc-tool .fc-toggle-btn{height:30px;padding:0 11px;border-radius:7px;border:1px solid var(--pt-border);background:var(--pt-surface);font-size:12px;font-weight:500;color:var(--pt-text-muted);cursor:pointer;transition:all .13s;white-space:nowrap;font-family:var(--pt-font-sans)}.precalc-tool .fc-toggle-btn:hover{background:var(--pt-chapter-bg);color:var(--pt-text)}.precalc-tool .fc-toggle-btn.active{background:var(--pt-accent-light);border-color:var(--pt-accent-border);color:var(--pt-accent);font-weight:600}.precalc-tool .fc-toggle-btn.active-orange{background:#fff7ed;border-color:#fed7aa;color:#c2410c;font-weight:600}.precalc-tool .fc-toggle-btn:disabled{opacity:.4;cursor:not-allowed}.precalc-tool .fc-progress-wrap{height:5px;background:var(--pt-border);border-radius:99px;margin-bottom:6px;overflow:hidden}.precalc-tool .fc-progress-bar{height:100%;background:var(--pt-accent);border-radius:99px;transition:width .3s ease}.precalc-tool .fc-progress-label{font-size:11.5px;color:var(--pt-text-faint);margin-bottom:20px;text-align:center}.precalc-tool .fc-card-area{perspective:1200px;margin-bottom:20px}.precalc-tool .flashcard-scene{width:100%;cursor:pointer;-webkit-user-select:none;user-select:none;outline:none}.precalc-tool .flashcard-inner{display:grid;width:100%;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.4,0,.2,1)}.precalc-tool .flashcard-scene.flipped .flashcard-inner{transform:rotateY(180deg)}.precalc-tool .flashcard-face{grid-area:1 / 1;min-height:320px;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--pt-surface);border:1px solid var(--pt-border);border-radius:14px;box-shadow:var(--pt-shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:28px 24px;gap:12px;overflow:visible}.precalc-tool .flashcard-back{transform:rotateY(180deg);background:#fafeff;border-color:#bfdbfe}.precalc-tool .flashcard-label{font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.1em;opacity:.7;align-self:flex-start}.precalc-tool .flashcard-name{font-size:15px;font-weight:700;color:var(--pt-text);text-align:center;line-height:1.3}.precalc-tool .flashcard-math{display:flex;align-items:center;justify-content:center;width:100%;overflow-x:auto;padding:8px 0}.precalc-tool .flashcard-math .katex{font-size:1.4em}.precalc-tool .flashcard-math .katex-display{margin:0!important}.precalc-tool .flashcard-math-small{display:flex;align-items:center;justify-content:center;width:100%;overflow-x:auto;opacity:.5;padding-top:4px}.precalc-tool .flashcard-math-small .katex{font-size:.9em}.precalc-tool .flashcard-math-small .katex-display{margin:0!important}.precalc-tool .flashcard-hint{font-size:10.5px;color:var(--pt-text-faint);margin-top:4px;align-self:flex-end}.precalc-tool .flashcard-explanation{font-size:15px;color:var(--pt-text);line-height:1.65;text-align:center;max-width:480px}.precalc-tool .fc-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}.precalc-tool .fc-nav-btn{height:38px;padding:0 18px;border-radius:9px;border:1px solid var(--pt-border);background:var(--pt-surface);font-size:13px;font-weight:600;color:var(--pt-text-muted);cursor:pointer;transition:all .13s;font-family:var(--pt-font-sans)}.precalc-tool .fc-nav-btn:hover:not(:disabled){background:var(--pt-chapter-bg);color:var(--pt-text);border-color:#c0bebc}.precalc-tool .fc-nav-btn:disabled{opacity:.3;cursor:not-allowed}.precalc-tool .fc-known-btn{height:38px;padding:0 18px;border-radius:9px;border:1px solid var(--pt-border);background:var(--pt-surface);font-size:13px;font-weight:500;color:var(--pt-text-muted);cursor:pointer;transition:all .13s;font-family:var(--pt-font-sans)}.precalc-tool .fc-known-btn:hover{background:#f0fdf4;border-color:#a7f3d0;color:#16a34a}.precalc-tool .fc-known-btn.is-known{background:#f0fdf4;border-color:#86efac;color:#16a34a;font-weight:700}.precalc-tool .fc-chapter-tag{display:flex;align-items:center;justify-content:center;gap:7px;font-size:11.5px;color:var(--pt-text-faint)}.precalc-tool .fc-chapter-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.precalc-tool .fc-empty{text-align:center;padding:60px 20px;color:var(--pt-text-muted)}.precalc-tool .fc-empty-icon{font-size:48px;margin-bottom:16px}.precalc-tool .fc-empty p{font-size:16px;margin-bottom:20px}.precalc-tool .fc-reset-btn{height:38px;padding:0 20px;border-radius:9px;border:1px solid var(--pt-accent-border);background:var(--pt-accent-light);color:var(--pt-accent);font-size:13px;font-weight:600;cursor:pointer;font-family:var(--pt-font-sans)}.precalc-tool .fc-reset-btn:hover{background:#dbeafe}@media(max-width:480px){.pt-formula-display .katex{font-size:1em}.precalc-tool .fc-page{padding:16px 14px 40px}.precalc-tool .flashcard-face{min-height:280px}.precalc-tool .flashcard-math .katex{font-size:1.2em}.precalc-tool .flashcard-explanation{font-size:14px}.precalc-tool .fc-keyboard-hint{display:none}}@media(min-width:480px){.pt-formula-grid{grid-template-columns:1fr 1fr}.pt-main-content{padding:24px 24px 48px}}@media(min-width:768px){.pt-header{flex-wrap:nowrap;padding:0 24px;height:60px}.pt-menu-btn{display:none}.pt-search-input{width:280px;order:0}.pt-sidebar-desktop{display:block}.pt-drawer-mobile,.pt-drawer-backdrop{display:none!important}.pt-formula-grid{grid-template-columns:1fr 1fr}.pt-main-content{padding:28px 28px 52px}.precalc-tool .fc-page{padding:32px 32px 56px}.precalc-tool .flashcard-face{min-height:360px;padding:36px 32px}.precalc-tool .flashcard-math .katex{font-size:1.55em}}@media(min-width:1024px){.pt-formula-grid{grid-template-columns:repeat(auto-fill,minmax(340px,1fr))}.pt-main-content{padding:32px 32px 56px}.pt-search-input{width:300px}}@media(min-width:1280px){.precalc-tool{--pt-sidebar-w: 250px}.pt-formula-grid{grid-template-columns:repeat(auto-fill,minmax(360px,1fr))}.pt-main-content{padding:36px 40px 60px}.pt-search-input{width:340px}.pt-header-title h1{font-size:16px}}.pt-textbook-main{padding:0!important;display:block}.pt-tb-page{display:flex;flex-direction:column;min-height:calc(100vh - 130px)}.pt-tb-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 14px;background:var(--pt-surface);border-bottom:1px solid var(--pt-border);flex-shrink:0;flex-wrap:wrap}.pt-tb-chapter-info{display:flex;align-items:center;gap:8px;min-width:0}.pt-tb-chapter-badge{flex-shrink:0;font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--ch-color, var(--pt-accent));background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 10%,white);border:1px solid color-mix(in srgb,var(--ch-color, var(--pt-accent)) 25%,white);padding:2px 8px;border-radius:6px;white-space:nowrap}.pt-tb-chapter-title{font-size:13px;font-weight:600;color:var(--pt-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pt-tb-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.pt-tb-nav-arrows{display:flex;gap:2px}.pt-tb-arrow-btn{width:30px;height:30px;display:inline-flex;align-items:center;justify-content:center;border-radius:7px;border:1px solid var(--pt-border);background:var(--pt-surface);font-size:18px;line-height:1;color:var(--pt-text-muted);cursor:pointer;transition:all .13s;font-family:var(--pt-font-sans)}.pt-tb-arrow-btn:hover:not(:disabled){background:var(--pt-chapter-bg);color:var(--pt-text);border-color:#c0bebc}.pt-tb-arrow-btn:disabled{opacity:.3;cursor:not-allowed}.pt-tb-open-btn{display:inline-flex;align-items:center;gap:4px;height:30px;padding:0 12px;border-radius:7px;border:1px solid var(--pt-accent-border);background:var(--pt-accent-light);color:var(--pt-accent);font-size:12px;font-weight:600;cursor:pointer;text-decoration:none;white-space:nowrap;transition:all .13s;font-family:var(--pt-font-sans)}.pt-tb-open-btn:hover{background:#dbeafe;border-color:#93c5fd}.pt-tb-frame-wrap{flex:1;position:relative;min-height:calc(100vh - 220px);background:var(--pt-bg)}.pt-tb-iframe{position:absolute;inset:0;width:100%;height:100%;border:none;display:block}.pt-tb-iframe-hidden{visibility:hidden;position:absolute}.pt-tb-loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:var(--pt-text-muted);font-size:14px;background:var(--pt-bg)}.pt-tb-spinner{width:32px;height:32px;border:3px solid var(--pt-border);border-top-color:var(--pt-accent);border-radius:50%;animation:ptSpin .7s linear infinite}@keyframes ptSpin{to{transform:rotate(360deg)}}.pt-tb-error{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:32px;text-align:center;color:var(--pt-text-muted);background:var(--pt-bg)}.pt-tb-error-icon{font-size:32px;opacity:.5}.pt-tb-error p{font-size:14px}.pt-folder-heading-row{display:flex;align-items:stretch;gap:0;border-radius:var(--pt-radius);border:1px solid var(--pt-border);border-left:4px solid var(--ch-color, var(--pt-accent));overflow:hidden;margin-bottom:12px}.pt-folder-heading-row .pt-folder-heading{flex:1;border:none;border-radius:0;margin-bottom:0;border-left:none}.pt-folder-heading-row .pt-folder-heading:hover{border-color:transparent}.pt-folder-heading-row .pt-folder-heading[aria-expanded=true]{margin-bottom:0}.pt-open-textbook-btn{flex-shrink:0;display:inline-flex;align-items:center;gap:5px;padding:0 12px;border:none;border-left:1px solid var(--pt-border);background:transparent;font-size:11px;font-weight:600;color:var(--pt-text-faint);cursor:pointer;white-space:nowrap;transition:background .13s,color .13s;font-family:var(--pt-font-sans)}.pt-open-textbook-btn:hover{background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 8%,white);color:var(--ch-color, var(--pt-accent))}.pt-sidebar-section-label{font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--pt-text-faint);padding:10px 10px 4px}.pt-sidebar-info{padding:12px 12px 4px;font-size:11.5px;color:var(--pt-text-faint);line-height:1.6}.pt-tb-chapter-btn{gap:6px}.pt-tb-ch-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;border:1.5px solid currentColor;transition:background .13s}.pt-tb-chapter-btn.active .pt-tb-ch-dot{background:var(--ch-color, var(--pt-accent))!important;border-color:var(--ch-color, var(--pt-accent))!important}.pt-sidebar-tabs .pt-sidebar-tab-btn{font-size:16px;padding:0;flex:1}.pt-tb-slow-hint{font-size:12px;color:var(--pt-text-faint);text-align:center;margin-top:4px}.pt-tb-slow-link{color:var(--pt-accent);text-decoration:underline;cursor:pointer}.pt-tb-slow-link:hover{color:#1d4ed8}.pt-tb-footer-hint{flex-shrink:0;padding:6px 14px;font-size:11px;color:var(--pt-text-faint);background:var(--pt-surface);border-top:1px solid var(--pt-border);line-height:1.5}.precalc-tool .pt-practice-main{display:flex;flex-direction:column;padding:0;background:var(--pt-bg)}.precalc-tool .pt-sidebar-info-sub{font-size:11px;color:var(--pt-text-faint);margin-top:4px}.precalc-tool .pt-practice-overview{padding:24px;max-width:900px;margin:0 auto;width:100%}.precalc-tool .pt-practice-overview-header{margin-bottom:20px}.precalc-tool .pt-practice-overview-title{font-size:22px;font-weight:700;color:var(--pt-text);margin:0 0 4px}.precalc-tool .pt-practice-overview-sub{font-size:13px;color:var(--pt-text-faint);margin:0}.precalc-tool .pt-ch-summary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}.precalc-tool .pt-ch-summary-btn{background:var(--pt-surface);border:1.5px solid var(--pt-border);border-radius:10px;padding:14px 16px;cursor:pointer;text-align:left;transition:border-color .15s,box-shadow .15s,transform .1s;display:flex;flex-direction:column;gap:8px}.precalc-tool .pt-ch-summary-btn:hover{border-color:var(--ch-color, var(--pt-accent));box-shadow:0 2px 12px #00000014;transform:translateY(-1px)}.precalc-tool .pt-ch-summary-btn.active{border-color:var(--ch-color, var(--pt-accent))}.precalc-tool .pt-ch-summary-top{display:flex;align-items:center;gap:8px}.precalc-tool .pt-ch-summary-title{flex:1;font-size:13px;font-weight:600;color:var(--pt-text)}.precalc-tool .pt-ch-summary-count{font-size:11px;color:var(--pt-text-muted);white-space:nowrap}.precalc-tool .pt-ch-summary-stats{font-size:11px;color:var(--pt-text-muted)}.precalc-tool .pt-pr-bar-wrap{height:6px;background:var(--pt-border);border-radius:3px;overflow:hidden;display:flex}.precalc-tool .pt-pr-segment{height:100%;transition:width .4s}.precalc-tool .pt-pr-incorrect{background:#ef4444}.precalc-tool .pt-practice-session{display:flex;flex-direction:column;min-height:0}.precalc-tool .pt-practice-session-header{display:flex;align-items:center;gap:10px;padding:10px 16px;border-bottom:1px solid var(--pt-border);background:var(--pt-surface);flex-shrink:0}.precalc-tool .pt-back-to-overview{background:none;border:1px solid var(--pt-border);border-radius:6px;padding:4px 10px;font-size:12px;cursor:pointer;color:var(--pt-text-faint);transition:color .15s,border-color .15s;white-space:nowrap}.precalc-tool .pt-back-to-overview:hover{color:var(--pt-text);border-color:var(--pt-accent)}.precalc-tool .pt-session-info{display:flex;align-items:center;gap:8px;flex:1;min-width:0}.precalc-tool .pt-session-ch-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.precalc-tool .pt-session-title{font-size:13px;font-weight:600;color:var(--pt-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.precalc-tool .pt-session-score{font-size:12px;color:var(--pt-text-muted);white-space:nowrap}.precalc-tool .pt-reset-btn{background:none;border:1px solid var(--pt-border);border-radius:6px;width:28px;height:28px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--pt-text-faint);font-size:14px;transition:color .15s,border-color .15s}.precalc-tool .pt-reset-btn:hover{color:#ef4444;border-color:#ef4444}.precalc-tool .pt-problem-strip{display:flex;flex-wrap:wrap;gap:4px;padding:8px 16px;border-bottom:1px solid var(--pt-border);background:var(--pt-surface);flex-shrink:0}.precalc-tool .pt-strip-dot{width:10px;height:10px;border-radius:50%;border:none;cursor:pointer;transition:transform .1s,opacity .15s;background:var(--pt-border)}.precalc-tool .pt-strip-dot.current{transform:scale(1.5);box-shadow:0 0 0 2px var(--pt-accent)}.precalc-tool .pt-strip-dot.correct{background:#22c55e}.precalc-tool .pt-strip-dot.incorrect{background:#ef4444}.precalc-tool .pt-strip-dot.skipped{background:#f59e0b}.precalc-tool .pt-problem-card{padding:20px 24px 40px;display:flex;flex-direction:column;gap:16px;max-width:800px;margin:0 auto;width:100%}.precalc-tool .pt-problem-nav-bar{display:flex;align-items:center;justify-content:space-between}.precalc-tool .pt-problem-nav-btn{background:var(--pt-surface);border:1px solid var(--pt-border);border-radius:6px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:18px;color:var(--pt-text-faint);transition:color .15s,border-color .15s}.precalc-tool .pt-problem-nav-btn:hover:not(:disabled){color:var(--pt-text);border-color:var(--pt-accent)}.precalc-tool .pt-problem-nav-btn:disabled{opacity:.3;cursor:not-allowed}.precalc-tool .pt-problem-counter{font-size:13px;color:var(--pt-text-muted)}.precalc-tool .pt-problem-body{background:var(--pt-surface);border:1.5px solid var(--pt-border);border-top:3px solid var(--ch-color, var(--pt-accent));border-radius:10px;padding:20px;display:flex;flex-direction:column;gap:10px}.precalc-tool .pt-problem-label{display:flex;align-items:center;gap:8px}.precalc-tool .pt-problem-number-badge{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;color:#fff;font-size:12px;font-weight:700;flex-shrink:0}.precalc-tool .pt-practice-math-html{font-size:15px;line-height:1.7;color:var(--pt-text)}.precalc-tool .pt-practice-math-html math{font-size:1em}.precalc-tool .pt-practice-math-html p{margin:0 0 6px}.precalc-tool .pt-practice-math-html p:last-child{margin-bottom:0}.precalc-tool .pt-answer-section{display:flex;flex-direction:column;gap:6px}.precalc-tool .pt-answer-label{font-size:12px;font-weight:600;color:var(--pt-text-muted);text-transform:uppercase;letter-spacing:.05em}.precalc-tool .pt-answer-input{width:100%;padding:10px 12px;font-size:14px;font-family:inherit;border:1.5px solid var(--pt-border);border-radius:8px;background:#fff;color:#000;resize:vertical;transition:border-color .15s;box-sizing:border-box}.precalc-tool .pt-answer-input::placeholder{color:#6b7280}.precalc-tool .pt-answer-input:focus{outline:none;border-color:var(--ch-color, var(--pt-accent));box-shadow:0 0 0 3px #6366f11a}.precalc-tool .pt-context-banner{background:#fff;border:1px solid #c7d7fa;border-radius:8px;padding:10px 14px;margin-bottom:4px;display:flex;gap:8px;align-items:flex-start}.precalc-tool .pt-context-banner-icon{font-size:13px;flex-shrink:0;margin-top:1px;color:#3b82f6}.precalc-tool .pt-context-banner-text{font-size:13px;line-height:1.55;color:#000}.precalc-tool .pt-problem-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.precalc-tool .pt-problem-type-badge{display:inline-flex;align-items:center;gap:4px;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;padding:2px 8px;border-radius:20px;border:1px solid transparent}.precalc-tool .pt-type-graph{background:#ede9fe;color:#5b21b6;border-color:#c4b5fd}.precalc-tool .pt-type-prove{background:#fef3c7;color:#92400e;border-color:#fcd34d}.precalc-tool .pt-type-evaluate{background:#dcfce7;color:#15803d;border-color:#86efac}.precalc-tool .pt-type-domain{background:#fff7ed;color:#c2410c;border-color:#fed7aa}.precalc-tool .pt-type-write{background:#f0fdf4;color:#166534;border-color:#bbf7d0}.precalc-tool .pt-type-algebraic{background:#eff6ff;color:#1d4ed8;border-color:#bfdbfe}.precalc-tool .pt-type-application{background:#fdf4ff;color:#7e22ce;border-color:#e9d5ff}.precalc-tool .pt-no-ref-badge{font-size:10px;font-weight:600;color:var(--pt-text-muted);padding:2px 8px;border-radius:20px;border:1px solid var(--pt-border);background:var(--pt-chapter-bg)}.precalc-tool .pt-graph-mode-box{background:#fff;border:1.5px dashed #94a3b8;border-radius:8px;padding:16px 18px;display:flex;gap:12px;align-items:flex-start}.precalc-tool .pt-graph-mode-icon{font-size:22px;flex-shrink:0}.precalc-tool .pt-graph-mode-text{font-size:13px;color:#000;line-height:1.6}.precalc-tool .pt-graph-mode-text strong{color:#000;display:block;margin-bottom:2px;font-size:13px}.precalc-tool .pt-no-answer-notice{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid #ddd6fe;border-radius:6px;padding:7px 12px;margin-top:-4px}.precalc-tool .pt-no-answer-notice-icon{font-size:12px;color:#7c3aed;flex-shrink:0}.precalc-tool .pt-no-answer-notice-text{font-size:11px;color:#000;line-height:1.4}.precalc-tool .pt-action-row{display:flex;flex-wrap:wrap;gap:8px}.precalc-tool .pt-check-btn{background:var(--ch-color, var(--pt-accent));color:#fff;border:none;border-radius:8px;padding:8px 20px;font-size:14px;font-weight:600;cursor:pointer;transition:opacity .15s,transform .1s}.precalc-tool .pt-check-btn:hover:not(:disabled){opacity:.9;transform:translateY(-1px)}.precalc-tool .pt-check-btn:disabled{opacity:.45;cursor:not-allowed}.precalc-tool .pt-show-solution-btn{background:var(--pt-surface);color:var(--pt-text-faint);border:1px solid var(--pt-border);border-radius:8px;padding:8px 16px;font-size:13px;cursor:pointer;transition:color .15s,border-color .15s}.precalc-tool .pt-show-solution-btn:hover{color:var(--pt-text);border-color:var(--pt-accent)}.precalc-tool .pt-skip-btn{background:none;color:var(--pt-text-faint);border:none;padding:8px 12px;font-size:13px;cursor:pointer;transition:color .15s;margin-left:auto}.precalc-tool .pt-skip-btn:hover{color:var(--pt-text)}.precalc-tool .pt-result-panel{border-radius:8px;padding:14px 16px;display:flex;flex-direction:column;gap:6px}.precalc-tool .pt-result-panel.correct{background:#fff;border:1px solid #86efac}.precalc-tool .pt-result-panel.incorrect{background:#fff;border:1px solid #fca5a5}.precalc-tool .pt-result-verdict{display:flex;align-items:center;gap:8px}.precalc-tool .pt-result-icon{font-size:16px;font-weight:700}.precalc-tool .pt-result-panel.correct .pt-result-icon{color:#16a34a}.precalc-tool .pt-result-panel.incorrect .pt-result-icon{color:#dc2626}.precalc-tool .pt-result-feedback{font-size:14px;font-weight:600;color:#000}.precalc-tool .pt-result-explanation{font-size:13px;color:#000;line-height:1.6;margin:0}.precalc-tool .pt-solution-panel{background:#fff;border:1px solid #fcd34d;border-radius:8px;padding:14px 16px;display:flex;flex-direction:column;gap:8px}.precalc-tool .pt-solution-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:#000}.precalc-tool .pt-solution-content{font-size:14px;color:#000;line-height:1.6;margin:0}.precalc-tool .pt-next-hint{display:flex;justify-content:flex-end}.precalc-tool .pt-next-btn{background:var(--pt-surface);border:1.5px solid var(--ch-color, var(--pt-accent));color:var(--ch-color, var(--pt-accent));border-radius:8px;padding:8px 20px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s,color .15s}.precalc-tool .pt-next-btn:hover:not(:disabled){background:var(--ch-color, var(--pt-accent));color:#fff}.precalc-tool .pt-next-btn:disabled{opacity:.3;cursor:not-allowed}.precalc-tool .pt-chapter-complete{margin:20px 24px;background:linear-gradient(135deg,#f0fdf4,#ecfdf5);border:2px solid #86efac;border-radius:12px;padding:28px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px}.precalc-tool .pt-complete-icon{font-size:40px}.precalc-tool .pt-chapter-complete h3{font-size:20px;font-weight:700;color:var(--pt-text);margin:0}.precalc-tool .pt-chapter-complete p{font-size:15px;color:var(--pt-text);margin:0}.precalc-tool .pt-complete-back-btn{background:#16a34a;color:#fff;border:none;border-radius:8px;padding:10px 24px;font-size:14px;font-weight:600;cursor:pointer;margin-top:8px;transition:opacity .15s}.precalc-tool .pt-complete-back-btn:hover{opacity:.9}.precalc-tool annotation-xml{display:none}.precalc-tool .pt-videos-page{padding:20px 24px 40px;max-width:1100px}.precalc-tool .pt-vp-page-header{margin-bottom:28px}.precalc-tool .pt-vp-page-title-row{display:flex;align-items:baseline;gap:14px;margin-bottom:6px}.precalc-tool .pt-vp-page-title{margin:0;font-size:20px;font-weight:700;color:var(--pt-text)}.precalc-tool .pt-vp-overall-progress{font-size:12px;font-weight:600;color:var(--pt-text-muted);background:var(--pt-surface);border:1px solid var(--pt-border);border-radius:20px;padding:2px 10px}.precalc-tool .pt-vp-page-subtitle{font-size:13px;color:var(--pt-text-muted);line-height:1.5;margin:0 0 14px}.precalc-tool .pt-vp-search{width:100%;max-width:400px;padding:8px 12px;font-size:13px;font-family:var(--pt-font-sans);border:1.5px solid var(--pt-border);border-radius:8px;background:#fff;color:#000;box-sizing:border-box}.precalc-tool .pt-vp-search:focus{outline:none;border-color:var(--pt-accent);box-shadow:0 0 0 3px #6366f11a}.precalc-tool .pt-vp-source{margin-bottom:32px}.precalc-tool .pt-vp-source-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;background:var(--pt-surface);border:1px solid var(--pt-border);border-radius:10px;margin-bottom:12px}.precalc-tool .pt-vp-source-info{display:flex;flex-direction:column;gap:3px}.precalc-tool .pt-vp-source-instructor{font-size:15px;font-weight:700;color:var(--pt-text)}.precalc-tool .pt-vp-source-stats{font-size:12px;color:var(--pt-text-muted)}.precalc-tool .pt-vp-playlist-link{font-size:12px;font-weight:600;color:var(--pt-accent);text-decoration:none;white-space:nowrap;padding:5px 10px;border:1px solid var(--pt-border);border-radius:6px;transition:background .13s}.precalc-tool .pt-vp-playlist-link:hover{background:color-mix(in srgb,var(--pt-accent) 8%,white)}.precalc-tool .pt-vp-series{margin-bottom:16px;border:1px solid var(--pt-border);border-left:4px solid var(--ch-color, var(--pt-accent));border-radius:var(--pt-radius);overflow:hidden}.precalc-tool .pt-vp-series-header{display:flex;align-items:center;gap:10px;padding:0 12px 0 0;background:var(--pt-surface);border-bottom:1px solid var(--pt-border)}.precalc-tool .pt-vp-series-toggle{flex:1;display:flex;align-items:center;gap:8px;padding:12px 14px;background:none;border:none;cursor:pointer;font-family:var(--pt-font-sans);text-align:left}.precalc-tool .pt-vp-series-chevron{font-size:12px;color:var(--pt-text-muted);flex-shrink:0}.precalc-tool .pt-vp-series-title{font-size:14px;font-weight:700;color:var(--pt-text)}.precalc-tool .pt-vp-series-count{font-size:11px;color:var(--pt-text-muted);background:var(--pt-bg);border:1px solid var(--pt-border);border-radius:10px;padding:1px 8px}.precalc-tool .pt-vp-series-meta{display:flex;align-items:center;gap:8px;flex-shrink:0}.precalc-tool .pt-vp-progress-bar{width:80px;height:6px;background:var(--pt-border);border-radius:3px;overflow:hidden}.precalc-tool .pt-vp-progress-fill{height:100%;border-radius:3px;transition:width .3s ease}.precalc-tool .pt-vp-progress-label{font-size:11px;color:var(--pt-text-muted);white-space:nowrap}.precalc-tool .pt-vp-series-desc{font-size:12px;color:var(--pt-text-muted);line-height:1.5;margin:0;padding:10px 16px 0}.precalc-tool .pt-vp-player-wrap{padding:14px 16px;border-bottom:1px solid var(--pt-border);background:#fff}.precalc-tool .pt-vp-player-header{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px}.precalc-tool .pt-vp-player-title{font-size:13px;font-weight:600;color:#000;line-height:1.4}.precalc-tool .pt-vp-player-actions{display:flex;align-items:center;gap:6px;flex-shrink:0}.precalc-tool .pt-vp-watched-btn{background:none;border:1px solid var(--ch-color, var(--pt-accent));color:var(--ch-color, var(--pt-accent));border-radius:6px;padding:4px 10px;font-size:11px;font-weight:600;cursor:pointer;font-family:var(--pt-font-sans);white-space:nowrap;transition:background .13s}.precalc-tool .pt-vp-watched-btn:hover{background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 10%,white)}.precalc-tool .pt-vp-close-btn{background:none;border:1px solid var(--pt-border);color:var(--pt-text-muted);border-radius:6px;padding:4px 8px;font-size:12px;cursor:pointer;font-family:var(--pt-font-sans);transition:background .13s,color .13s}.precalc-tool .pt-vp-close-btn:hover{background:var(--pt-surface);color:var(--pt-text)}.precalc-tool .pt-vp-embed-container{position:relative;width:100%;padding-bottom:56.25%;border-radius:8px;overflow:hidden;background:#000}.precalc-tool .pt-vp-embed{position:absolute;inset:0;width:100%;height:100%;border:none}.precalc-tool .pt-vp-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(155px,1fr));gap:10px;padding:14px 16px}.precalc-tool .pt-vp-card{background:none;border:1.5px solid var(--pt-border);border-radius:8px;padding:0;cursor:pointer;text-align:left;overflow:hidden;display:flex;flex-direction:column;font-family:var(--pt-font-sans);transition:border-color .13s,box-shadow .13s}.precalc-tool .pt-vp-card:hover{border-color:var(--ch-color, var(--pt-accent));box-shadow:0 2px 8px #00000014}.precalc-tool .pt-vp-card--active{border-color:var(--ch-color, var(--pt-accent));box-shadow:0 0 0 2px color-mix(in srgb,var(--ch-color, var(--pt-accent)) 30%,transparent)}.precalc-tool .pt-vp-card--watched{opacity:.6}.precalc-tool .pt-vp-thumb-wrap{position:relative;width:100%;aspect-ratio:16/9;background:#000;overflow:hidden}.precalc-tool .pt-vp-thumb{width:100%;height:100%;object-fit:cover;display:block}.precalc-tool .pt-vp-thumb-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#00000038;opacity:0;transition:opacity .15s}.precalc-tool .pt-vp-card:hover .pt-vp-thumb-overlay,.precalc-tool .pt-vp-card--active .pt-vp-thumb-overlay{opacity:1}.precalc-tool .pt-vp-play-icon{color:#fff;font-size:22px;filter:drop-shadow(0 1px 3px rgba(0,0,0,.5))}.precalc-tool .pt-vp-watched-badge{width:28px;height:28px;border-radius:50%;background:var(--ch-color, var(--pt-accent));color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}.precalc-tool .pt-vp-num-badge{position:absolute;bottom:4px;left:5px;font-size:10px;font-weight:700;color:#fff;background:#0000008c;border-radius:3px;padding:1px 4px;line-height:1.4}.precalc-tool .pt-vp-card-title{font-size:11px;font-weight:500;color:#000;line-height:1.4;padding:6px 8px 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.precalc-tool .pt-vp-empty{padding:40px 0;text-align:center;color:var(--pt-text-muted);font-size:14px}@media(prefers-color-scheme:dark){.precalc-tool .pt-vp-search{background:#1e293b80;color:#e2e8f0;border-color:#475569}.precalc-tool .pt-vp-player-wrap{background:var(--pt-surface)}.precalc-tool .pt-vp-player-title,.precalc-tool .pt-vp-card-title{color:var(--pt-text)}.precalc-tool .pt-vp-playlist-link:hover{background:color-mix(in srgb,var(--pt-accent) 12%,#1e293b)}.precalc-tool .pt-vp-watched-btn:hover{background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 15%,#1e293b)}}.pt-open-textbook-btn--active{background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 12%,white);color:var(--ch-color, var(--pt-accent))}.pt-lecture-panel{background:#fff;border:1px solid var(--pt-border);border-left:4px solid var(--ch-color, var(--pt-accent));border-radius:var(--pt-radius);padding:16px;margin-bottom:12px}.pt-lecture-empty{font-size:13px;color:var(--pt-text-muted);padding:12px 0}.pt-lecture-player-wrap{margin-bottom:16px}.pt-lecture-player-header{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px}.pt-lecture-player-title{font-size:13px;font-weight:600;color:#000;line-height:1.4}.pt-lecture-player-close{flex-shrink:0;background:none;border:none;font-size:14px;color:var(--pt-text-muted);cursor:pointer;padding:2px 6px;border-radius:4px;font-family:var(--pt-font-sans)}.pt-lecture-player-close:hover{background:var(--pt-surface);color:var(--pt-text)}.pt-lecture-embed-container{position:relative;width:100%;padding-bottom:56.25%;border-radius:8px;overflow:hidden;background:#000}.pt-lecture-embed{position:absolute;inset:0;width:100%;height:100%;border:none}.pt-lecture-mark-watched{margin-top:8px;background:none;border:1px solid var(--ch-color, var(--pt-accent));color:var(--ch-color, var(--pt-accent));border-radius:6px;padding:5px 14px;font-size:12px;font-weight:600;cursor:pointer;font-family:var(--pt-font-sans);transition:background .13s,color .13s}.pt-lecture-mark-watched:hover{background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 10%,white)}.pt-lecture-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}.pt-lecture-card{background:none;border:1.5px solid var(--pt-border);border-radius:8px;padding:0;cursor:pointer;text-align:left;overflow:hidden;transition:border-color .13s,box-shadow .13s;font-family:var(--pt-font-sans);display:flex;flex-direction:column}.pt-lecture-card:hover{border-color:var(--ch-color, var(--pt-accent));box-shadow:0 2px 8px #00000014}.pt-lecture-card--active{border-color:var(--ch-color, var(--pt-accent));box-shadow:0 0 0 2px color-mix(in srgb,var(--ch-color, var(--pt-accent)) 25%,transparent)}.pt-lecture-card--watched{opacity:.65}.pt-lecture-thumb-wrap{position:relative;width:100%;aspect-ratio:16/9;overflow:hidden;background:#000}.pt-lecture-thumb{width:100%;height:100%;object-fit:cover;display:block}.pt-lecture-play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#00000040;opacity:0;transition:opacity .15s}.pt-lecture-card:hover .pt-lecture-play-overlay,.pt-lecture-card--active .pt-lecture-play-overlay{opacity:1}.pt-lecture-play-icon{color:#fff;font-size:22px;line-height:1;filter:drop-shadow(0 1px 3px rgba(0,0,0,.5))}.pt-lecture-watched-badge{background:var(--ch-color, var(--pt-accent));color:#fff;border-radius:50%;width:28px;height:28px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}.pt-lecture-card-title{font-size:11px;font-weight:500;color:#000;line-height:1.4;padding:7px 8px 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}@media(prefers-color-scheme:dark){.pt-lecture-panel{background:var(--pt-surface);border-color:var(--pt-border)}.pt-lecture-player-title,.pt-lecture-card-title{color:var(--pt-text)}.pt-open-textbook-btn--active{background:color-mix(in srgb,var(--ch-color, var(--pt-accent)) 18%,#1e293b);color:var(--ch-color, var(--pt-accent))}}@media(prefers-color-scheme:dark){.precalc-tool .pt-result-panel.correct{background:#fff;border-color:#86efac}.precalc-tool .pt-result-panel.correct .pt-result-icon{color:#16a34a}.precalc-tool .pt-result-panel.incorrect{background:#fff;border-color:#fca5a5}.precalc-tool .pt-result-panel.incorrect .pt-result-icon{color:#dc2626}.precalc-tool .pt-result-feedback,.precalc-tool .pt-result-explanation{color:#000}.precalc-tool .pt-solution-panel{background:#fff;border-color:#fcd34d}.precalc-tool .pt-solution-label,.precalc-tool .pt-solution-content{color:#000}.precalc-tool .pt-context-banner{background:#fff;border-color:#c7d7fa}.precalc-tool .pt-context-banner-text{color:#000}.precalc-tool .pt-chapter-complete{background:#22c55e1a;border-color:#166534}.precalc-tool .pt-no-answer-notice{background:#fff;border-color:#ddd6fe}.precalc-tool .pt-no-answer-notice-icon{color:#7c3aed}.precalc-tool .pt-no-answer-notice-text{color:#000}.precalc-tool .pt-graph-mode-box{background:#fff;border-color:#94a3b8}.precalc-tool .pt-graph-mode-text,.precalc-tool .pt-graph-mode-text strong{color:#000}.precalc-tool .pt-context-banner-icon{color:#3b82f6}.precalc-tool .pt-answer-input{background:#fff;border-color:var(--pt-border);color:#000}.precalc-tool .pt-graph-panel{border-color:#334155}.precalc-tool .pt-graph-panel-header,.precalc-tool .pt-graph-panel-cta{background:#1e293b99;border-color:#334155}}.precalc-tool .pt-graph-panel{margin:12px 0;border:1px solid var(--pt-border);border-radius:10px;overflow:visible;background:var(--pt-bg);position:relative}.precalc-tool .pt-graph-panel--expanded{position:fixed;inset:0;z-index:8000;margin:0;border-radius:0;border:none;display:flex;flex-direction:column}.precalc-tool .pt-graph-toolbar{display:flex;align-items:center;gap:8px;padding:8px 14px;background:var(--pt-surface);border-bottom:1px solid var(--pt-border);flex-wrap:wrap;border-radius:10px 10px 0 0}.precalc-tool .pt-graph-panel--expanded .pt-graph-toolbar{border-radius:0}.precalc-tool .pt-graph-toolbar-title{font-size:13px;font-weight:600;color:var(--pt-text);margin-right:4px}.precalc-tool .pt-graph-toolbar-controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-left:auto}.precalc-tool .pt-graph-toggle{display:flex;align-items:center;gap:4px;font-size:12px;color:var(--pt-text-muted);cursor:pointer;-webkit-user-select:none;user-select:none}.precalc-tool .pt-graph-toggle input{cursor:pointer;accent-color:var(--pt-accent)}.precalc-tool .pt-graph-expand-btn,.precalc-tool .pt-graph-reset-btn{padding:4px 10px;font-size:12px;font-family:var(--pt-font-sans);border:1px solid var(--pt-border);border-radius:6px;background:var(--pt-bg);color:var(--pt-text);cursor:pointer;transition:background .13s}.precalc-tool .pt-graph-expand-btn:hover,.precalc-tool .pt-graph-reset-btn:hover{background:var(--pt-surface)}.precalc-tool .pt-graph-status{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 14px;background:var(--pt-surface);border-bottom:1px solid var(--pt-border);font-size:12px;flex-wrap:wrap}.precalc-tool .pt-graph-status-ok{color:#16a34a;font-weight:600}.precalc-tool .pt-graph-status-hint{color:var(--pt-text-muted)}.precalc-tool .pt-graph-size-label{color:var(--pt-text-muted);font-size:11px;white-space:nowrap}.precalc-tool .pt-graph-mafs-wrap{width:100%;overflow:hidden;flex:1}.precalc-tool .pt-graph-panel--expanded .pt-graph-mafs-wrap{height:auto}.precalc-tool .pt-graph-drag-handle{display:flex;align-items:center;justify-content:center;height:18px;background:var(--pt-surface);border-top:1px solid var(--pt-border);border-radius:0 0 10px 10px;cursor:ns-resize;color:var(--pt-text-muted);-webkit-user-select:none;user-select:none;transition:background .13s}.precalc-tool .pt-graph-drag-handle:hover{background:color-mix(in srgb,var(--pt-accent) 6%,var(--pt-surface))}.precalc-tool .pt-graph-drag-icon{font-size:13px;letter-spacing:2px;opacity:.5}.precalc-tool .pt-ch-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;padding:8px 0 24px}.precalc-tool .pt-ch-card{border:1.5px solid var(--pt-border);border-left:4px solid var(--ch-color, var(--pt-accent));border-radius:var(--pt-radius);padding:16px;background:var(--pt-surface);display:flex;flex-direction:column;gap:10px}.precalc-tool .pt-ch-card-top{display:flex;align-items:flex-start;gap:10px}.precalc-tool .pt-ch-card-num{min-width:30px;height:30px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff;flex-shrink:0}.precalc-tool .pt-ch-card-info{display:flex;flex-direction:column;gap:2px}.precalc-tool .pt-ch-card-title{font-size:14px;font-weight:600;color:var(--pt-text);line-height:1.3}.precalc-tool .pt-ch-card-counts{font-size:11px;color:var(--pt-text-muted)}.precalc-tool .pt-ch-card-stats{font-size:12px;color:var(--pt-text-muted)}.precalc-tool .pt-ch-card-actions{display:flex;gap:8px;flex-wrap:wrap}.precalc-tool .pt-ch-start-btn{flex:1;padding:8px 12px;color:#fff;border:none;border-radius:7px;font-size:13px;font-weight:600;cursor:pointer;font-family:var(--pt-font-sans);transition:opacity .15s}.precalc-tool .pt-ch-start-btn:hover{opacity:.88}.precalc-tool .pt-ch-quiz-btn{padding:8px 12px;background:var(--pt-bg);color:var(--pt-text);border:1.5px solid var(--pt-border);border-radius:7px;font-size:13px;font-weight:600;cursor:pointer;font-family:var(--pt-font-sans);transition:background .13s;white-space:nowrap}.precalc-tool .pt-ch-quiz-btn:hover{background:var(--pt-surface)}.precalc-tool .pt-problem-meta-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:10px 16px 0}.precalc-tool .pt-problem-verified-badge{font-size:11px;font-weight:600;color:#16a34a;background:#dcfce7;border:1px solid #86efac;border-radius:10px;padding:2px 8px}.precalc-tool .pt-problem-context{margin:12px 16px 0;background:#eff6ff;border:1px solid #bfdbfe;border-left:4px solid #3b82f6;border-radius:8px;padding:10px 14px}.precalc-tool .pt-problem-context-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:#3b82f6;margin-bottom:4px}.precalc-tool .pt-problem-context-body{font-size:13px;color:#1e40af;line-height:1.5}.precalc-tool .pt-problem-body{padding:12px 16px 0}.precalc-tool .pt-problem-body-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--pt-text-muted);margin-bottom:6px}.precalc-tool .pt-textbook-ref{display:flex;align-items:center;gap:6px;padding:6px 16px;font-size:11px;color:var(--pt-text-muted);background:var(--pt-surface);border-top:1px solid var(--pt-border);border-bottom:1px solid var(--pt-border);margin-top:10px}.precalc-tool .pt-textbook-ref-icon{font-size:12px;flex-shrink:0}.precalc-tool .pt-textbook-ref-text{line-height:1.4}.precalc-tool .pt-textbook-ref-text em{color:var(--pt-text-muted);font-style:normal}.precalc-tool .pt-self-assess-row{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.precalc-tool .pt-self-assess-label{font-size:12px;color:var(--pt-text-muted);white-space:nowrap}.precalc-tool .pt-self-yes-btn{padding:6px 14px;background:#dcfce7;color:#15803d;border:1px solid #86efac;border-radius:7px;font-size:13px;font-weight:600;cursor:pointer;font-family:var(--pt-font-sans)}.precalc-tool .pt-self-yes-btn:hover{background:#bbf7d0}.precalc-tool .pt-self-no-btn{padding:6px 14px;background:#fee2e2;color:#dc2626;border:1px solid #fca5a5;border-radius:7px;font-size:13px;font-weight:600;cursor:pointer;font-family:var(--pt-font-sans)}.precalc-tool .pt-self-no-btn:hover{background:#fecaca}.precalc-tool .pt-session-mode-toggle{display:flex;gap:4px;border:1px solid var(--pt-border);border-radius:7px;overflow:hidden;background:var(--pt-surface)}.precalc-tool .pt-mode-btn{padding:5px 12px;font-size:12px;font-weight:600;background:none;border:none;cursor:pointer;color:var(--pt-text-muted);font-family:var(--pt-font-sans);transition:background .13s,color .13s;white-space:nowrap}.precalc-tool .pt-mode-btn.active{background:var(--pt-accent);color:#fff}.precalc-tool .pt-mode-btn:not(.active):hover{background:var(--pt-bg);color:var(--pt-text)}.precalc-tool .pt-mc-choices{display:flex;flex-direction:column;gap:8px;padding:14px 16px}.precalc-tool .pt-mc-choice{display:flex;align-items:center;gap:10px;padding:11px 14px;background:var(--pt-bg);border:1.5px solid var(--pt-border);border-radius:8px;cursor:pointer;font-family:var(--pt-font-sans);font-size:14px;text-align:left;transition:background .12s,border-color .12s;width:100%}.precalc-tool .pt-mc-choice:hover:not(:disabled){background:var(--pt-surface);border-color:var(--pt-accent)}.precalc-tool .pt-mc-choice:disabled{cursor:default}.precalc-tool .pt-mc-choice.pt-mc-selected{background:#eff6ff;border-color:#3b82f6}.precalc-tool .pt-mc-choice.pt-mc-correct{background:#dcfce7;border-color:#16a34a;color:#14532d}.precalc-tool .pt-mc-choice.pt-mc-wrong{background:#fee2e2;border-color:#dc2626;color:#7f1d1d}.precalc-tool .pt-mc-letter{min-width:26px;height:26px;display:flex;align-items:center;justify-content:center;background:var(--pt-surface);border:1px solid var(--pt-border);border-radius:50%;font-size:12px;font-weight:700;flex-shrink:0;color:var(--pt-text-muted)}.precalc-tool .pt-mc-choice.pt-mc-correct .pt-mc-letter{background:#16a34a;border-color:#16a34a;color:#fff}.precalc-tool .pt-mc-choice.pt-mc-wrong .pt-mc-letter{background:#dc2626;border-color:#dc2626;color:#fff}.precalc-tool .pt-mc-text{flex:1;color:var(--pt-text);line-height:1.4}.precalc-tool .pt-mc-tick{color:#16a34a;font-weight:700;font-size:16px;margin-left:auto}.precalc-tool .pt-mc-cross{color:#dc2626;font-weight:700;font-size:16px;margin-left:auto}@media(prefers-color-scheme:dark){.precalc-tool .pt-problem-context{background:#3b82f614;border-color:#3b82f64d}.precalc-tool .pt-problem-context-body{color:#93c5fd}.precalc-tool .pt-problem-context-label{color:#60a5fa}.precalc-tool .pt-mc-choice{background:var(--pt-surface)}.precalc-tool .pt-mc-choice:hover:not(:disabled){background:var(--pt-bg)}.precalc-tool .pt-mc-choice.pt-mc-correct{background:#16a34a26;border-color:#16a34a;color:#86efac}.precalc-tool .pt-mc-choice.pt-mc-wrong{background:#dc262626;border-color:#dc2626;color:#fca5a5}.precalc-tool .pt-mc-letter{background:var(--pt-bg)}.precalc-tool .pt-problem-verified-badge{background:#16a34a26;border-color:#16a34a66;color:#86efac}.precalc-tool .pt-graph-toolbar,.precalc-tool .pt-graph-status{background:var(--pt-surface)}}@media(max-width:600px){.precalc-tool .pt-practice-overview{padding:16px}.precalc-tool .pt-ch-summary-grid{grid-template-columns:1fr}.precalc-tool .pt-problem-card{padding:14px 16px}.precalc-tool .pt-practice-session-header{flex-wrap:wrap}.precalc-tool .pt-session-title{font-size:12px}}.precalc-tool .pt-footer{background:#0f172a;color:#cbd5e1;border-top:1px solid #1e293b;font-size:13px;line-height:1.65;margin-top:64px}.precalc-tool .pt-footer-inner{max-width:960px;margin:0 auto;padding:36px 28px 24px;display:flex;flex-direction:column;gap:24px}.precalc-tool .pt-footer-block-heading{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:700;color:#f1f5f9;margin-bottom:10px;letter-spacing:.01em}.precalc-tool .pt-footer-icon{font-size:18px;line-height:1}.precalc-tool .pt-footer-block p{color:#94a3b8;margin:0 0 10px;max-width:680px}.precalc-tool .pt-footer-leonard{background:linear-gradient(135deg,#6366f114,#8b5cf60d);border:1px solid rgba(99,102,241,.25);border-radius:10px;padding:18px 20px}.precalc-tool .pt-footer-leonard .pt-footer-block-heading{color:#a5b4fc}.precalc-tool .pt-footer-link{color:#818cf8;text-decoration:none;font-weight:500;transition:color .13s}.precalc-tool .pt-footer-link:hover{color:#a5b4fc;text-decoration:underline}.precalc-tool .pt-footer-divider{height:1px;background:#1e293b}.precalc-tool .pt-footer-citations .pt-footer-block-heading{color:#e2e8f0}.precalc-tool .pt-footer-cite-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}.precalc-tool .pt-footer-cite-list li{color:#94a3b8;padding-left:14px;border-left:2px solid #334155}.precalc-tool .pt-footer-cite-list li strong{color:#e2e8f0}.precalc-tool .pt-footer-cite-list li em{color:#cbd5e1;font-style:italic}.precalc-tool .pt-footer-bottom{font-size:11px;color:#475569;text-align:center;padding-top:4px}@media(max-width:600px){.precalc-tool .pt-footer-inner{padding:28px 18px 20px}.precalc-tool .pt-footer-leonard{padding:14px 16px}}.MafsView{display:block;background:var(--mafs-bg);overflow:hidden;-webkit-user-select:none;user-select:none;font-family:inherit;font-variant-numeric:tabular-nums;touch-action:none;outline:0;--mafs-bg: black;--mafs-fg: white;--mafs-origin-color: var(--mafs-fg);--mafs-line-color: #555;--mafs-line-stroke-dash-style: 4, 3;--mafs-axis-stroke-width: 1px;--grid-line-subdivision-color: #222;--mafs-red: #f11d0e;--mafs-orange: #f14e0e;--mafs-yellow: #ffe44a;--mafs-green: #15e272;--mafs-blue: #58a6ff;--mafs-indigo: #7c58ff;--mafs-violet: #ae58ff;--mafs-pink: #ee00ab}.MafsView text{fill:var(--mafs-fg);cursor:default}.MafsView path{stroke:var(--mafs-fg)}.MafsView:focus-visible{border-radius:5px;outline:3px solid #58a6ff}@supports not selector(:focus-visible){.MafsView:focus{border-radius:5px;outline:3px solid #58a6ff}}.mafs-shadow{paint-order:stroke;stroke-width:3px;stroke:var(--mafs-bg);stroke-opacity:.75;stroke-linejoin:round}.mafs-movable-point{cursor:grab;touch-action:none}.mafs-movable-point-dragging{cursor:grabbing}.mafs-movable-point:focus{outline:0}.mafs-movable-point *{fill:none;stroke:none}.mafs-movable-point-hitbox{fill:transparent}.mafs-movable-point-focus{stroke:var(--movable-point-color);stroke-width:2;stroke-opacity:0;fill:none;transition:stroke-opacity .2s ease}.mafs-movable-point-ring{fill:var(--movable-point-color);fill-opacity:.25;stroke:none;transition:r .2s ease}.mafs-movable-point-point{fill:var(--movable-point-color);transition:r .2s ease}.mafs-movable-point:hover .mafs-movable-point-point,.mafs-movable-point:focus-visible .mafs-movable-point-point{r:calc(var(--movable-point-ring-size) - 2px)}.mafs-movable-point:hover .mafs-movable-point-ring,.mafs-movable-point:focus-visible .mafs-movable-point-ring{r:calc(var(--movable-point-ring-size) + 3px)}.mafs-movable-point.mafs-movable-point-dragging .mafs-movable-point-ring{r:var(--movable-point-ring-size)}.mafs-movable-point:focus-visible .mafs-movable-point-focus{stroke-opacity:1}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{-webkit-font-smoothing:antialiased;overflow:hidden}