@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;position:relative;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.17.0"}.katex .katex-mathml{border:0;-webkit-clip-path:inset(50%);clip-path:inset(50%);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}:root{font-family:Inter,Noto Sans Tamil,Nirmala UI,Latha,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#10243e;background:#fff;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #10243e;--muted: #607086;--teal: #087a5b;--teal-dark: #056447;--mint: #e7f5f0;--mint-soft: #f5fbf8;--line: #d8e0e7;--line-dark: #bcc8d2;--amber: #bb5b0b;--amber-bg: #fff8ed;--danger: #a73d39;--danger-bg: #fff5f4}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;min-height:100vh;background:#fff}button,select,textarea{font:inherit}button{color:inherit}button:focus-visible,a:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid rgba(8,122,91,.25);outline-offset:2px}.app-shell{min-height:100vh;display:grid;grid-template-columns:290px minmax(0,1fr) 260px;grid-template-rows:66px minmax(0,1fr)}.topbar{grid-column:1 / -1;position:sticky;top:0;z-index:30;display:grid;grid-template-columns:minmax(0,1fr) auto auto auto minmax(0,1fr);column-gap:14px;align-items:center;min-height:66px;padding:0 26px;border-bottom:1px solid var(--line);background:#fffffff7;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.brand-group,.header-controls,.bookmark-summary{display:flex;align-items:center}.brand-group{gap:13px}.brand-icon{width:27px;height:27px;stroke-width:1.8}.brand-title{font-size:18px;font-weight:760;letter-spacing:-.025em}.unit-pill{color:var(--muted);font-size:12px;font-weight:650;white-space:nowrap}.paper-picker{display:flex;align-items:center;justify-self:end}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.paper-picker select{min-width:230px;max-width:330px;height:38px;padding:0 30px 0 10px;overflow:hidden;border:1px solid var(--line-dark);border-radius:7px;color:var(--ink);background:#fff;font-size:12px;font-weight:680;text-overflow:ellipsis;cursor:pointer}.header-controls{justify-content:center;gap:12px}.header-select{height:42px;min-width:132px;padding:0 14px;display:flex;align-items:center;justify-content:space-between;gap:18px;border:1px solid var(--line-dark);border-radius:8px;background:#fff;font-size:14px;font-weight:610;cursor:default}.header-select svg{width:16px;height:16px}.language-control{min-width:176px}.question-total{min-width:150px}.bookmark-summary{justify-content:flex-end;gap:10px;font-size:14px;font-weight:650}.bookmark-summary svg{width:20px;height:20px}.bookmark-count{min-width:22px;height:22px;display:grid;place-items:center;border-radius:999px;color:#fff;background:var(--teal);font-size:11px}.icon-button{width:40px;height:40px;padding:0;display:grid;place-items:center;border:0;border-radius:7px;background:transparent;cursor:pointer}.icon-button:hover{background:#f2f5f7}.icon-button svg{width:21px;height:21px;stroke-width:1.8}.mobile-menu{display:none}.desktop-sidebar{position:relative;grid-column:1;grid-row:2;border-right:1px solid var(--line);background:#fcfdfd}.sidebar{position:sticky;top:66px;height:calc(100vh - 66px);padding:27px 18px;overflow-y:auto}.sidebar-heading{padding:0 9px 20px;color:var(--teal-dark)}.sidebar-heading span{display:block;font-size:20px;font-weight:760}.sidebar-heading small{display:block;margin-top:3px;color:var(--muted);font-size:12px;font-weight:560}.topic-nav{display:flex;flex-direction:column;gap:6px}.topic-link{width:100%;min-height:72px;padding:11px 12px;display:grid;grid-template-columns:32px minmax(0,1fr) 18px;align-items:start;gap:10px;border:0;border-left:4px solid transparent;border-radius:0 8px 8px 0;background:transparent;text-align:left;cursor:pointer}.topic-link:hover{background:#f2f7f5}.topic-link.selected{border-left-color:var(--teal);background:var(--mint)}.topic-link>svg{width:25px;height:25px;margin-top:5px;stroke-width:1.7}.topic-link>.topic-chevron{width:17px;height:17px;margin-top:7px;color:#6b7b8d;transition:transform .18s ease}.topic-group.expanded .topic-chevron{transform:rotate(180deg)}.topic-copy{min-width:0;display:flex;flex-direction:column;gap:2px}.topic-copy strong{font-size:14px;line-height:1.3}.topic-copy small{color:var(--muted);font-size:11px}.topic-tamil{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:#526378;font-size:11px;line-height:1.4;white-space:normal}.section-nav{margin:3px 7px 8px 17px;padding:5px 0 5px 18px;display:grid;gap:3px;border-left:1px solid #cbd9d4}.section-nav button{width:100%;padding:7px 8px;display:flex;align-items:center;justify-content:space-between;gap:8px;border:0;border-radius:6px;color:#536579;background:transparent;text-align:left;font-size:11px;line-height:1.35;cursor:pointer}.section-nav button:hover{color:var(--teal-dark);background:#eef5f2}.section-nav button.selected{color:var(--teal-dark);background:#e5f2ed;font-weight:720}.section-nav button small{min-width:21px;height:21px;display:grid;place-items:center;border-radius:99px;color:#536579;background:#edf1f3;font-size:9px}.progress-block{margin:30px 8px 0;padding-top:22px;border-top:1px solid var(--line)}.progress-label{display:flex;justify-content:space-between;gap:12px;font-size:12px}.progress-label strong{color:var(--teal)}.progress-track{height:7px;margin-top:10px;overflow:hidden;border-radius:99px;background:#e3e8ed}.progress-track span{display:block;height:100%;border-radius:inherit;background:var(--teal);transition:width .24s ease}.progress-block p{margin:10px 0 0;color:var(--muted);font-size:10px;line-height:1.5}.mobile-sidebar-wrap{display:none}.question-column{grid-column:2;grid-row:2;width:min(100%,980px);justify-self:center;padding:28px 32px 50px}.question-meta-row{min-height:38px;display:flex;align-items:start;justify-content:space-between;gap:18px}.question-meta{display:flex;align-items:center;flex-wrap:wrap;gap:10px;color:#526277;font-size:12px;font-weight:620}.question-meta i{width:3px;height:3px;border-radius:50%;background:#7b8795}.question-bookmark{margin-top:-10px}.question-bookmark.active{color:var(--teal);background:var(--mint)}.source-note{margin:7px 0 20px;padding:13px 15px;display:flex;gap:11px;border:1px solid #edcf9b;border-radius:8px;color:#6f3a08;background:var(--amber-bg)}.source-note>svg{flex:0 0 auto;width:19px;height:19px;margin-top:2px}.source-note strong,.source-note span,.source-note small{display:block}.source-note strong{font-size:12px}.source-note span{margin-top:2px;font-size:12px;line-height:1.5}.source-note small{margin-top:5px;color:#87521f;font-size:11px;line-height:1.6}.question-section{display:grid;grid-template-columns:48px 1fr;gap:8px}.question-number{padding-top:2px;font-family:Georgia,serif;font-size:22px;font-weight:700}.question-copy h1,.question-tamil{max-width:800px;color:#13243a;font-family:Inter,Noto Sans Tamil,Nirmala UI,Latha,system-ui,sans-serif;font-size:20px;font-weight:720;line-height:1.55;letter-spacing:-.008em}.question-copy h1{margin:0}.question-tamil{margin:9px 0 0}.question-figure{margin:16px 0 4px;max-width:720px}.question-figure img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:8px;background:#fff}.options-list{margin:24px 0 28px 40px;display:flex;flex-direction:column;gap:8px}.answer-option{min-height:57px;width:100%;padding:10px 13px;display:grid;grid-template-columns:23px 24px minmax(0,1fr) auto;align-items:center;gap:8px;border:1px solid transparent;border-radius:8px;background:transparent;text-align:left;cursor:pointer}.answer-option:hover{border-color:var(--line);background:#fafcfd}.radio-mark{width:20px;height:20px;display:grid;place-items:center;border:1.7px solid #27384b;border-radius:50%}.radio-mark svg{width:13px;height:13px;stroke-width:3}.option-copy{display:grid;gap:3px}.option-copy>span,.option-copy small{color:#1c2f44;font-family:Inter,Noto Sans Tamil,Nirmala UI,Latha,system-ui,sans-serif;font-size:15px;font-weight:620;line-height:1.5}.option-copy small{color:#43576d}.option-result{font-size:11px;font-weight:740;white-space:nowrap}.selected-correct{border-color:var(--teal);color:var(--teal-dark);background:var(--mint-soft)}.selected-correct .radio-mark{color:#fff;border-color:var(--teal);background:var(--teal)}.selected-correct .option-copy>span,.selected-correct .option-result{color:var(--teal-dark)}.selected-wrong{border-color:#d88682;color:var(--danger);background:var(--danger-bg)}.selected-wrong .radio-mark{color:#fff;border-color:var(--danger);background:var(--danger)}.selected-wrong .option-copy>span,.selected-wrong .option-result{color:var(--danger)}.selected-neutral{border-color:#94a7b7;background:#f5f8fa}.selected-neutral .radio-mark{border:5px solid var(--teal)}.answer-lesson{padding:27px 18px 26px;border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark)}.answer-pending{margin-top:8px;padding:18px 20px;display:grid;gap:4px;border:1px solid #d7e1e7;border-radius:8px;color:#30465b;background:#f7fafb}.answer-pending strong{color:var(--teal-dark);font-size:13px}.answer-pending span{font-size:13px}.answer-pending small{color:#5b6d7f;font-size:12px;line-height:1.6}.lesson-heading-row{display:flex;justify-content:space-between;gap:20px}.answer-kicker{color:var(--teal);font-size:12px;font-weight:760;text-transform:uppercase;letter-spacing:.08em}.lesson-heading-row h2{margin:5px 0 0;font-family:Georgia,serif;font-size:22px;line-height:1.4}.lesson-heading-row p{margin:4px 0 0;color:#526378;font-size:14px}.verified-answer{height:31px;padding:0 10px;display:inline-flex;align-items:center;gap:6px;border:1px solid #9ccbbb;border-radius:6px;color:var(--teal-dark);background:var(--mint-soft);font-size:11px;font-weight:740;white-space:nowrap}.verified-answer svg{width:14px;height:14px;stroke-width:3}.verified-answer.key-mismatch{border-color:#ddb66f;color:#78460d;background:#fff8e8}.formula{margin:22px 0 8px;padding:18px 20px;overflow-x:auto;border-left:4px solid var(--teal);color:#132941;background:#f4f8f7;font-family:Cambria,Times New Roman,serif;font-size:22px;font-style:italic;line-height:1.5;white-space:nowrap}.math-text{display:inline}.math-text>span{display:inline}.math-text .math-seg{display:inline}.math-text .katex{font-size:1.04em;display:inline}.math-text .katex-display{display:inline;margin:0;text-align:left}.math-text .katex-display>.katex{display:inline;text-align:left}.math-text.math-display,.math-text.math-display .math-seg{display:block}.math-text.math-display .katex-display,.math-text.math-display .katex-display>.katex{display:block;text-align:left}.formula .math-text.math-display .katex{font-size:1.12em;font-style:normal}.option-copy>.math-text,.option-copy small .math-text{display:block}.bilingual-explanation{margin-top:22px;display:grid;grid-template-columns:1fr 1fr;gap:32px}.bilingual-explanation article+article{padding-left:28px;border-left:1px solid var(--line)}.bilingual-explanation h3{margin:0 0 8px;color:var(--teal-dark);font-size:14px}.bilingual-explanation p{margin:0;color:#304357;font-family:Georgia,Times New Roman,serif;font-size:15px;line-height:1.75;white-space:pre-line}.bilingual-explanation p+p{margin-top:12px}.bilingual-explanation article[lang=ta] p{font-family:Noto Sans Tamil,Nirmala UI,sans-serif;font-size:14px;line-height:1.9}.aptitude-explanation{margin-top:24px;width:100%}.aptitude-explanation article{width:100%}.aptitude-explanation p{margin:0;color:#1a2f44;font-family:Noto Sans Tamil,Nirmala UI,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:2;white-space:pre-line;letter-spacing:.01em}.aptitude-explanation p+p{margin-top:18px}.aptitude-explanation strong{color:#0c2339;font-weight:750}.aptitude-explanation .math-text{font-size:1.06em}.aptitude-explanation .katex{font-size:1.1em}.memory-line{margin-top:22px;padding:13px 15px;display:flex;gap:11px;border:1px solid #dbe6d0;border-radius:7px;background:#fafdf7}.memory-line>svg{flex:0 0 auto;width:19px;height:19px;color:#8c6d08}.memory-line p{margin:0;color:#314637;font-size:12px;line-height:1.6}.memory-line .takeaway-ta{display:block;margin-top:3px;color:#536451}.lesson-illustration{margin:24px 0 0}.lesson-illustration svg{width:100%;height:auto;max-height:230px}.axis{stroke:#10243e;stroke-width:1.4;fill:none}.guide{stroke:#10243e;stroke-width:1.1;fill:none}.cycle-line{stroke:#8291a1;stroke-width:2;stroke-dasharray:6 5;fill:none}.season-line{stroke:var(--teal);stroke-width:3;fill:none}.chart-label{fill:#20374c;font-size:13px;font-weight:650}.axis-label{fill:#536579;font-size:12px}.axis-label.vertical{transform:rotate(-90deg);transform-origin:22px 115px}.lesson-illustration figcaption{margin:2px 0 0;color:var(--muted);font-size:11px;line-height:1.6;text-align:center}.lesson-illustration figcaption span{display:block}.concept-illustration{padding:14px 16px 10px;border:1px solid #d9e5e1;border-radius:8px;background:#fbfdfc}.limit-line{stroke:#b45b55;stroke-width:1.5;stroke-dasharray:7 5}.centre-line{stroke:var(--teal);stroke-width:1.8}.data-line{fill:none;stroke:#60768a;stroke-width:2}.data-point{fill:#fff;stroke:#345166;stroke-width:2}.signal-point{fill:#c95850;stroke:#fff;stroke-width:2}.signal-label{fill:#9b3f39;font-size:12px;font-weight:700}.oc-single{fill:none;stroke:#8291a1;stroke-width:3}.oc-double{fill:none;stroke:var(--teal);stroke-width:3}.oc-label{font-size:12px;font-weight:700}.oc-label.single{fill:#657587}.oc-label.double{fill:var(--teal-dark)}.formula-map{display:grid;grid-template-columns:1fr 1fr;gap:12px}.formula-map>div{padding:18px;border:1px solid #d4e3de;border-radius:8px;background:#f8fbfa}.formula-map strong,.formula-map code,.formula-map span{display:block}.formula-map strong{color:var(--teal-dark)}.formula-map code{margin:12px 0;color:#17324a;font-family:Cambria,serif;font-size:17px}.formula-map span{color:var(--muted);font-size:11px}.critical-edge{stroke:var(--teal);stroke-width:5}.normal-edge{stroke:#8795a4;stroke-width:2}.dummy-edge{stroke:#c48835;stroke-width:2.5;stroke-dasharray:7 5}.node{fill:#fff;stroke:#18334d;stroke-width:2}.node-label{fill:#18334d;font-size:13px;font-weight:800;text-anchor:middle}.critical-label{fill:var(--teal-dark);font-size:12px;font-weight:750}.pert-illustration{padding:22px;border-radius:8px;background:#f5f9f7;text-align:center}.pert-scale{position:relative;margin:12px 12px 28px;display:flex;justify-content:space-between;border-top:3px solid #9cb6ac}.pert-scale i{position:relative;margin-top:-9px;color:#18334d;font-family:Georgia,serif;font-size:18px;font-style:normal}.pert-scale i:before{content:"";display:block;width:15px;height:15px;margin:0 auto 8px;border-radius:50%;background:var(--teal)}.pert-scale i.likely:before{width:20px;height:20px;margin-top:-3px;background:#c58b30}.pert-scale small{display:block;margin-top:4px;color:var(--muted);font-family:Inter,sans-serif;font-size:10px}.assignment-illustration{text-align:center}.assignment-illustration table{margin:0 auto 12px;border-collapse:collapse}.assignment-illustration th,.assignment-illustration td{width:64px;height:44px;border:1px solid #bdcbc7}.assignment-illustration th{color:#40566b;background:#f2f6f5}.assignment-illustration td.chosen{color:#fff;background:var(--teal);font-weight:800;box-shadow:inset 0 0 0 3px #bfe0d4}.capability-visual{padding:20px;border-radius:8px;background:#f6faf8}.spec-band{display:grid;grid-template-columns:auto 1fr auto 1fr auto;align-items:center;gap:10px}.spec-band i{height:12px;border-radius:8px;background:linear-gradient(90deg,#d9e8e2,var(--teal))}.spec-band b{color:#17384e;font-size:12px}.spec-band span{color:#a04e48;font-weight:750}.capability-equation{margin-top:15px;color:var(--teal-dark);font-family:Georgia,serif;text-align:center}.sampling-flow{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px}.sampling-flow div{padding:16px;border:1px solid #d4e2dd;border-radius:8px;background:#f7faf9}.sampling-flow b,.sampling-flow span{display:block}.sampling-flow b{margin-bottom:8px;color:var(--teal-dark)}.sampling-flow span{color:#52677a;font-size:11px;line-height:1.7}.sampling-flow>i{color:#a46f22;font-size:20px;font-style:normal}.chart-selector{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.chart-selector div{padding:13px 8px;border-top:3px solid var(--teal);background:#f4f8f6;text-align:center}.chart-selector b,.chart-selector span{display:block}.chart-selector b{color:#17364d;font-size:11px}.chart-selector span{margin-top:7px;color:#566a7c;font-size:10px;line-height:1.5}.unit8-visual{padding:12px 14px 8px;border:1px solid #d8e5e1;border-radius:8px;background:#fbfdfc}.trend-path,.fitted-line{stroke:var(--teal);stroke-width:4;fill:none}.cycle-path{stroke:#74889d;stroke-width:3;stroke-dasharray:8 5;fill:none}.season-path{stroke:#c68b2f;stroke-width:2.5;fill:none}.u8-label{font-size:12px;font-weight:750}.u8-label.trend{fill:var(--teal-dark)}.u8-label.cycle,.u8-label.residual-text{fill:#596f83}.u8-label.season{fill:#9c6718}.u8-label.irregular{fill:#9a4d48}.residual{stroke:#c66a64;stroke-width:1.5;stroke-dasharray:4 3}.observed{fill:#fff;stroke:#18344e;stroke-width:2}.process-steps{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:stretch;gap:10px}.process-steps div{padding:16px;display:grid;place-content:center;border:1px solid #d5e2de;border-radius:8px;text-align:center}.process-steps div.accent{border-color:#9bcbbb;background:#eef8f4}.process-steps i{align-self:center;color:var(--teal-dark);font-family:Georgia,serif;font-size:18px;font-style:normal;font-weight:700}.process-steps b,.process-steps span{display:block}.process-steps b{color:#18344d;font-size:13px}.process-steps span{margin-top:5px;color:var(--muted);font-size:10px}.prob-illustration{padding:16px 16px 12px;border:1px solid #d8e5e1;border-radius:10px;background:#fbfdfc}.prob-illustration .prob-row{display:flex;align-items:stretch;justify-content:center;flex-wrap:wrap;gap:10px}.prob-illustration .prob-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.prob-illustration .prob-step{flex:1 1 140px;min-width:120px;max-width:220px;padding:14px 12px;display:grid;place-content:center;border:1px solid #d5e2de;border-radius:8px;background:#fff;text-align:center}.prob-illustration .prob-step.accent{border-color:#9bcbbb;background:#eef8f4}.prob-illustration .prob-step b{display:block;color:#18344d;font-size:12px;line-height:1.35}.prob-illustration .prob-step span{display:block;margin-top:6px;color:var(--muted);font-size:11px;line-height:1.45}.prob-illustration .prob-op{flex:0 0 auto;align-self:center;color:var(--teal-dark);font-family:Georgia,serif;font-size:18px;font-style:normal;font-weight:700}.prob-illustration .prob-bayes{display:grid;gap:10px;justify-items:center}.prob-illustration .prob-bayes-top{display:flex;align-items:stretch;justify-content:center;flex-wrap:wrap;gap:10px;width:100%}.prob-illustration .prob-bayes-top .prob-step{max-width:200px}.prob-illustration .prob-bayes>.prob-step{width:min(100%,420px);max-width:none}.prob-illustration .prob-bayes-arrow{color:var(--teal-dark);font-size:20px;font-weight:700;line-height:1}.prob-illustration figcaption{margin-top:12px}.index-meter{padding:22px 26px;border-radius:8px;background:#f7faf9}.meter-row{display:flex;justify-content:space-between;color:#53677b;font-weight:750;text-align:center}.meter-row .base{color:var(--teal-dark)}.meter-row small{font-size:9px}.meter-track{position:relative;height:8px;margin:8px 0 16px;border-radius:9px;background:linear-gradient(90deg,#dbe8e3,#4c9c82)}.meter-track i{position:absolute;left:50%;top:-6px;width:3px;height:20px;background:#17344c}.inverse-row{display:flex;justify-content:center;gap:28px;color:#a2514c;font-size:13px}.inverse-row strong{color:var(--teal-dark)}.reversal-map{padding:20px;border:1px solid #d8e4e0;border-radius:8px}.loop{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px}.loop span{width:32px;height:32px;display:grid;place-items:center;border-radius:50%;color:#fff;background:var(--teal);font-weight:800}.loop i{color:#53677b;font-style:normal;font-size:12px}.test-equations{margin-top:20px;display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.test-equations p{margin:0;padding:12px;border-radius:6px;background:#f3f7f6;color:#273f53;font-family:Georgia,serif;text-align:center}.test-equations b{display:block;margin-bottom:5px;color:var(--teal-dark);font-family:Inter,sans-serif;font-size:11px}.index-family{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.index-family div{padding:14px 8px;border-top:3px solid var(--teal);background:#f5f8f7;text-align:center}.index-family b,.index-family span{display:block}.index-family b{color:#19344b;font-size:12px}.index-family span{margin-top:6px;color:var(--muted);font-size:9px;line-height:1.4}.macro-steps{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;padding:20px;background:#f7faf9}.macro-steps div{padding:12px 16px;border:1px solid #d2e1dc;border-radius:7px;text-align:center}.macro-steps b,.macro-steps span{display:block}.macro-steps b{color:var(--teal-dark)}.macro-steps span{color:var(--muted);font-size:10px}.macro-steps i{color:#718294;font-style:normal}.macro-steps>strong{color:#8a5c18}.macro-axis{padding:18px;border-radius:8px;background:#fff8eb}.macro-quadrant{min-height:120px;display:grid;grid-template-columns:1fr 1fr;align-items:center;border-left:2px solid #273f54;border-bottom:2px solid #273f54;text-align:center}.macro-quadrant b{grid-column:1/-1;color:#8b4a16;font-size:20px}.price-up{color:#b14d46}.output-down{color:#315f78}.macro-cycle{padding:22px;border-radius:8px;background:#f6f9f8;text-align:center}.macro-cycle div{display:flex;justify-content:center;flex-wrap:wrap;gap:10px}.macro-cycle span{padding:8px 11px;border-radius:5px;color:#17364d;background:#e3f0eb;font-weight:700}.macro-cycle i{align-self:center;color:#a46f22;font-style:normal}.macro-cycle small{display:block;margin-top:14px;color:var(--muted)}.income-map{display:grid;grid-template-columns:1fr 1fr;gap:9px}.income-map div{padding:14px;border-left:3px solid var(--teal);background:#f5f9f7}.income-map b,.income-map span{display:block}.income-map b{color:#18364d;font-size:12px}.income-map span{margin-top:6px;color:#596b7e;font-size:11px}.income-map .identity{border-left-color:#b77b27;background:#fff9ed}.consumption-line{stroke:var(--teal);stroke-width:4}.saving-line{stroke:#bd7b26;stroke-width:3}.macro-label{fill:#53677a;font-size:12px;font-weight:700}.macro-label.consumption{fill:var(--teal-dark)}.macro-label.saving{fill:#9b641d}.investment-compare,.macro-scope{display:grid;grid-template-columns:1fr 1fr;gap:12px}.investment-compare div,.macro-scope div{padding:18px;border:1px solid #d4e2dd;border-radius:8px;background:#f7faf9;text-align:center}.investment-compare b,.investment-compare span,.investment-compare i,.macro-scope b,.macro-scope span{display:block}.investment-compare b,.macro-scope b{color:var(--teal-dark)}.investment-compare span,.macro-scope span{margin-top:7px;color:#52677a;font-size:11px}.investment-compare i{margin-top:8px;color:#a06c25;font-size:10px;font-style:normal}.macro-scope{grid-template-columns:1fr auto 1fr;align-items:center}.macro-scope>i{color:#8a5a1c;font-family:Georgia,serif;font-style:italic}.demand-gap{padding:22px;border-radius:8px;background:#f6f9f8}.employment-bar{position:relative;height:34px;margin:8px 0;overflow:hidden;border-radius:5px;background:#e1e7e5}.employment-bar i{position:absolute;inset:0 auto 0 0;background:#d0a04c}.employment-bar.full i{width:100%;background:#5b9d86}.employment-bar b{position:relative;z-index:1;padding-left:10px;line-height:34px;color:#17354c;font-size:11px}.demand-gap>span{display:block;margin-top:10px;color:#934b45;font-size:12px;text-align:center}.wrong-options{margin-top:22px;border:1px solid var(--line-dark);border-radius:8px;overflow:hidden}.wrong-options>button{width:100%;min-height:56px;padding:0 17px;display:flex;align-items:center;justify-content:space-between;gap:18px;border:0;background:#fff;text-align:left;font-size:14px;font-weight:720;cursor:pointer}.wrong-options>button:hover{background:#f8fafb}.wrong-options>button small{margin-left:6px;color:var(--muted);font-size:12px;font-weight:540}.wrong-options>button svg{width:18px;height:18px;transition:transform .18s ease}.wrong-options.open>button svg{transform:rotate(180deg)}.wrong-options-body{padding:4px 17px 17px;background:#fbfcfd}.wrong-options-body article{padding:16px 0;display:grid;grid-template-columns:29px 1fr;gap:12px;border-top:1px solid var(--line)}.wrong-key{width:27px;height:27px;display:grid;place-items:center;border:1px solid #cf918d;border-radius:50%;color:var(--danger);font-size:11px;font-weight:760}.wrong-options-body p{margin:0;color:#34475b;font-size:13px;line-height:1.6}.wrong-options-body .ta-note{margin-top:4px;color:#607086;font-size:12px;line-height:1.7}.question-angle{margin-top:9px;padding:9px 11px;border-left:3px solid #dda755;color:#62481d;background:#fffbf3;font-size:11px;line-height:1.55}.question-angle span{display:block;margin-top:2px}.question-pagination{margin-top:22px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.question-pagination>span{color:var(--muted);font-size:12px;font-weight:650}.question-pagination button{width:fit-content;min-width:112px;height:43px;padding:0 14px;display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--teal);border-radius:7px;color:var(--teal-dark);background:#fff;font-size:13px;font-weight:720;cursor:pointer}.question-pagination button:disabled{opacity:.4;cursor:not-allowed}.question-pagination button svg{width:17px;height:17px}.question-pagination .next-button{justify-self:end;color:#fff;background:var(--teal)}.question-pagination .next-button:hover{background:var(--teal-dark)}.source-rail{grid-column:3;grid-row:2;min-width:0;padding:20px 14px;border-left:1px solid var(--line);background:#fcfdfd}.rail-section{margin-bottom:16px;padding:16px;border:1px solid var(--line);border-radius:8px;background:#fff}.rail-section h2{margin:0 0 13px;color:#18314a;font-size:13px}.source-section h2{color:var(--amber)}.source-section dl{margin:0}.source-section dl>div{padding:4px 0;display:grid;grid-template-columns:70px 1fr;gap:8px;font-size:11px;line-height:1.45}.source-section dt{color:var(--muted)}.source-section dd{min-width:0;margin:0;overflow-wrap:anywhere;font-weight:630}.source-link{margin-top:12px;padding-top:11px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);color:var(--teal-dark);font-size:11px;font-weight:720;text-decoration:none}.source-link svg{width:14px;height:14px}.verification-section h2{display:flex;align-items:center;gap:7px;color:var(--teal-dark)}.verification-section h2 svg{width:18px;height:18px}.verification-section p{margin:0;display:flex;align-items:center;gap:7px;color:#3c594d;font-size:11px;font-weight:650}.verification-section p svg{width:15px;height:15px}.verification-section small{margin-top:8px;display:block;color:var(--muted);font-size:9px;line-height:1.55}.verification-section.has-note{border-color:#e5c58e;background:var(--amber-bg)}.quick-actions h2{margin-bottom:8px}.quick-actions button{width:100%;height:38px;padding:0;display:flex;align-items:center;gap:9px;border:0;color:#3c4e61;background:transparent;font-size:11px;text-align:left;cursor:pointer}.quick-actions button:hover,.quick-actions button.active{color:var(--teal-dark)}.quick-actions button svg{width:17px;height:17px}.notes-section textarea{width:100%;min-height:120px;padding:9px;resize:vertical;border:0;border-top:1px solid var(--line);color:#32475b;background:#fcfdfd;font-size:11px;line-height:1.6}.notes-section textarea::placeholder{color:#96a2ae}.notes-section small{display:block;margin-top:5px;color:#8794a1;font-size:9px}@media(max-width:1180px){.app-shell{grid-template-columns:250px minmax(0,1fr);grid-template-rows:66px minmax(0,1fr) auto}.source-rail{grid-column:2;grid-row:3;width:min(100%,980px);margin:0 auto;padding:4px 26px 34px;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px;align-items:start;border-left:0;background:transparent}.source-rail .rail-section{margin-bottom:0}.question-column{grid-column:2}.topbar{grid-template-columns:minmax(0,1fr) auto auto auto}.subject-switch button span,.bookmark-summary{display:none}.header-controls{justify-content:end}.question-total{display:none}}@media(max-width:820px){.app-shell{display:block;padding-top:96px}.topbar{position:fixed;min-height:0;padding:8px 14px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;grid-template-areas:"brand timer controls" "subject picker picker";column-gap:10px;row-gap:8px}.brand-group{grid-area:brand;min-width:0}.test-timer,.bookmark-summary{grid-area:timer}.header-controls{grid-area:controls;justify-self:end;gap:7px}.subject-switch{grid-area:subject}.subject-switch button{min-width:0;height:38px;padding:0 9px;font-size:11px}.paper-picker{grid-area:picker;justify-self:stretch;margin:0}.paper-picker span{display:none}.paper-picker select{width:100%;min-width:0;max-width:none;height:38px;padding-left:10px;font-size:12px}.brand-title{font-size:15px}.unit-pill,.brand-icon{display:none}.mobile-menu{display:grid}.mode-switch button{min-width:52px;height:32px;font-size:11px}.header-select{min-width:0;height:37px;padding:0 9px;gap:7px;font-size:12px}.language-control,.desktop-sidebar{display:none}.mobile-sidebar-wrap{display:block;pointer-events:none}.mobile-sidebar-wrap .sidebar-scrim{position:fixed;top:96px;right:0;bottom:0;left:0;z-index:37;border:0;opacity:0;background:#10243e57;transition:opacity .18s ease}.mobile-sidebar-wrap .sidebar{position:fixed;top:96px;bottom:0;left:0;z-index:38;width:min(310px,84vw);height:auto;border-right:1px solid var(--line);background:#fff;transform:translate(-102%);transition:transform .2s ease}.mobile-sidebar-wrap.open{pointer-events:auto}.mobile-sidebar-wrap.open .sidebar-scrim{opacity:1}.mobile-sidebar-wrap.open .sidebar{transform:translate(0)}.question-column{width:100%;padding:22px 18px 38px}.source-rail{width:100%;padding:0 18px 34px}.question-section{grid-template-columns:39px 1fr;gap:6px}.question-number{font-size:18px}.question-copy h1{font-size:20px}.question-tamil{font-size:15px}.options-list{margin-left:0}.answer-option{grid-template-columns:22px 22px minmax(0,1fr)}.option-copy{display:flex;flex-direction:column;align-items:flex-start}.option-result{grid-column:3}.bilingual-explanation{grid-template-columns:1fr;gap:20px}.bilingual-explanation article+article{padding:20px 0 0;border-top:1px solid var(--line);border-left:0}.wrong-options>button small{display:block;margin:3px 0 0}}.analysis-cards,.singularity-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.analysis-cards div,.singularity-row div,.analysis-flow div{padding:14px;border:1px solid #cfe1dc;border-radius:8px;background:#f6faf8;text-align:center}.analysis-cards b,.analysis-cards span,.singularity-row b,.singularity-row span,.analysis-flow b,.analysis-flow span{display:block}.analysis-cards b,.singularity-row b,.analysis-flow b{color:var(--teal-dark)}.analysis-cards span,.singularity-row span,.analysis-flow span{margin-top:5px;color:#53677a;font-size:11px;line-height:1.45}.analysis-flow{display:flex;align-items:center;justify-content:center;gap:12px}.analysis-flow i{color:#a06920;font-style:normal;text-align:center}.variation-strip,.metric-path,.series-strip{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:9px;padding:18px;border-radius:8px;background:#f7faf9}.variation-strip span,.metric-path span,.series-strip span{padding:8px 12px;border:1px solid #cfe1dc;border-radius:6px;background:#fff;color:var(--teal-dark);font-weight:700}.variation-strip i,.metric-path i,.series-strip i{color:#8a5d24;font-size:11px;font-style:normal}.variation-strip strong,.metric-path strong,.series-strip strong{width:100%;text-align:center;color:#52677a;font-size:11px}.derivative-chart{border-radius:8px;background:#f6faf8}.derivative-chart line{stroke:#51687a;stroke-width:2}.derivative-chart path{fill:none;stroke:#08765b;stroke-width:5}.derivative-chart text{fill:#8a5d24;font-size:14px;font-weight:700}.contour-map{display:flex;align-items:center;justify-content:center;gap:22px;padding:18px;background:#f7faf9;border-radius:8px}.contour-ring{position:relative;width:96px;height:68px;border:3px solid #08765b;border-radius:50%}.contour-ring span{position:absolute;left:43px;top:23px;width:9px;height:9px;border-radius:50%;background:#a55d25;color:transparent}.contour-ring i{position:absolute;right:-8px;top:5px;color:#08765b;font-style:normal}.contour-map strong{color:#17364d;font-family:Georgia,serif;font-size:13px}.doe-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.doe-grid div,.anova-split div,.f-ratio div{padding:14px;border:1px solid #cfe1dc;border-radius:8px;background:#f6faf8;text-align:center}.doe-grid b,.doe-grid span,.anova-split b,.anova-split span,.f-ratio b,.f-ratio span{display:block}.doe-grid b,.anova-split b,.f-ratio b{color:var(--teal-dark)}.doe-grid span,.anova-split span,.f-ratio span{margin-top:5px;color:#53677a;font-size:11px;line-height:1.55}.anova-split,.f-ratio,.anova-df{display:flex;align-items:center;justify-content:center;gap:10px;padding:18px;border-radius:8px;background:#f7faf9}.anova-split>strong,.f-ratio>strong{color:#8a5d24}.anova-split>i,.anova-df>i{color:#8a5d24;font-style:normal;font-weight:700}.anova-df span,.anova-df strong{padding:10px;text-align:center;color:#53677a}.anova-df b,.anova-df strong{color:var(--teal-dark)}.fisher-card{padding:24px;border-radius:8px;background:linear-gradient(135deg,#edf7f3,#fff7e8);text-align:center}.fisher-card b,.fisher-card span,.fisher-card small{display:block}.fisher-card b{color:var(--teal-dark);font-family:Georgia,serif;font-size:22px}.fisher-card span{margin-top:8px;color:#8a5d24;font-weight:700}.fisher-card small{margin-top:8px;color:#53677a}.latin-missing{display:flex;align-items:center;justify-content:center;gap:20px;padding:18px;border-radius:8px;background:#f7faf9}.latin-board{display:grid;grid-template-columns:repeat(3,34px);gap:4px}.latin-board span,.latin-board b{display:grid;place-items:center;height:34px;border:1px solid #cfe1dc;border-radius:4px;background:#fff;color:#53677a}.latin-board b{border-color:#d49a4d;background:#fff4df;color:#9b6119}.latin-missing>div:last-child b,.latin-missing>div:last-child span{display:block}.latin-missing>div:last-child b{color:var(--teal-dark)}.latin-missing>div:last-child span{color:#53677a;font-size:11px;line-height:1.65}.df-stability{display:flex;align-items:center;gap:8px;padding:18px;border-radius:8px;background:#f7faf9}.df-stability span{color:#53677a;font-size:11px}.df-stability i{height:8px;flex:1;border-radius:5px;background:#e3b16c}.df-stability i.stable{background:#1a9475}.df-stability strong{color:var(--teal-dark);font-size:11px}@media(max-width:560px){.formula-map{grid-template-columns:1fr}.concept-illustration{padding-inline:4px}.process-steps{grid-template-columns:1fr}.process-steps i{justify-self:center}.test-equations{grid-template-columns:1fr}.index-family{grid-template-columns:1fr 1fr}.income-map,.investment-compare,.macro-scope,.analysis-cards,.singularity-row,.doe-grid{grid-template-columns:1fr}.macro-scope>i{justify-self:center}.sampling-flow{grid-template-columns:1fr}.sampling-flow>i{justify-self:center;transform:rotate(90deg)}.chart-selector{grid-template-columns:1fr 1fr}.analysis-flow,.contour-map,.anova-split,.f-ratio,.anova-df,.latin-missing{flex-direction:column}.analysis-flow i,.anova-df>i{transform:rotate(90deg)}.df-stability{flex-wrap:wrap}.df-stability i{min-width:55px}.prob-illustration .prob-grid-3{grid-template-columns:1fr}.prob-illustration .prob-step{max-width:none;flex-basis:100%}}@media(max-width:520px){.topbar{justify-content:flex-start}.header-controls{margin-left:auto}.brand-title{max-width:none;font-size:14px;white-space:nowrap}.question-meta span:last-child,.question-meta i:last-of-type{display:none}.question-column,.source-rail{padding-inline:14px}.source-note{padding:11px}.question-copy h1{font-size:19px;line-height:1.45}.question-tamil{line-height:1.65}.answer-lesson{padding-inline:8px}.lesson-heading-row{flex-direction:column}.verified-answer{align-self:flex-start}.formula{margin-inline:-8px;padding:14px 12px;font-size:17px}.wrong-options>button{font-size:12px}.question-pagination button{min-width:98px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important}}.unit-pill{padding:5px 9px;border-radius:99px;color:var(--teal-dark);background:var(--mint);font-size:11px;font-weight:750}.mode-switch{display:flex;padding:3px;border:1px solid var(--line);border-radius:9px;background:#f5f7f8}.mode-switch button{min-width:82px;height:34px;border:0;border-radius:6px;color:var(--muted);background:transparent;font-size:13px;font-weight:720;cursor:pointer}.mode-switch button.active{color:#fff;background:var(--teal);box-shadow:0 2px 6px #087a5b2e}.mode-switch button:disabled{color:#98a3ad;cursor:not-allowed;opacity:.72}.bookmark-summary{justify-self:end;border:0;background:transparent;cursor:pointer}.test-timer{justify-self:end;display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px}.test-timer svg{width:18px;color:var(--teal)}.test-timer strong{color:var(--ink);font-size:17px;font-variant-numeric:tabular-nums}.question-column{position:relative}.question-side-arrow,.test-side-arrow{position:fixed;top:48%;z-index:8;width:42px;height:58px;display:grid;place-items:center;border:1px solid var(--line);border-radius:9px;color:var(--teal-dark);background:#fffffff5;box-shadow:0 8px 24px #10243e17;cursor:pointer}.question-side-arrow.previous{left:306px}.question-side-arrow.next{right:276px}.question-side-arrow:disabled,.test-side-arrow:disabled{opacity:.25;cursor:not-allowed}.quick-actions>small{display:block;margin-top:8px;color:var(--muted);font-size:9px;line-height:1.5}.drawer-layer{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60;visibility:hidden;pointer-events:none}.drawer-layer.open{visibility:visible;pointer-events:auto}.drawer-scrim{position:absolute;top:0;right:0;bottom:0;left:0;border:0;background:#10243e61;opacity:0;transition:opacity .2s}.drawer-layer.open .drawer-scrim{opacity:1}.bookmark-drawer{position:absolute;top:0;right:0;width:min(430px,92vw);height:100%;padding:22px;overflow-y:auto;background:#fff;box-shadow:-18px 0 50px #10243e24;transform:translate(100%);transition:transform .22s}.drawer-layer.open .bookmark-drawer{transform:translate(0)}.drawer-heading,.drawer-heading>div{display:flex;align-items:center}.drawer-heading{justify-content:space-between;padding-bottom:18px;border-bottom:1px solid var(--line)}.drawer-heading>div{gap:11px}.drawer-heading svg{width:21px;color:var(--teal)}.drawer-heading span{display:flex;flex-direction:column}.drawer-heading small{color:var(--muted);font-size:10px}.drawer-heading button{border:0;background:transparent;cursor:pointer}.drawer-empty{min-height:60vh;display:grid;place-content:center;justify-items:center;color:var(--muted);text-align:center}.drawer-empty svg{width:34px;height:34px;margin-bottom:12px}.drawer-empty p{max-width:250px;font-size:12px;line-height:1.6}.bookmark-list{margin-top:14px;display:flex;flex-direction:column;gap:8px}.bookmark-list button{padding:13px;display:flex;flex-direction:column;gap:5px;border:1px solid var(--line);border-radius:8px;background:#fff;text-align:left;cursor:pointer}.bookmark-list button:hover{border-color:#9bc8ba;background:var(--mint-soft)}.bookmark-list span,.bookmark-list small{color:var(--muted);font-size:10px}.bookmark-list strong{font-family:Georgia,serif;font-size:13px;line-height:1.4}.test-shell{display:block;background:var(--mint-soft);--test-sticky-top: 82px}.test-shell .topbar{min-height:66px}.test-shell .paper-picker,.test-shell .subject-switch{display:none}.test-page{max-width:1480px;min-height:calc(100vh - 66px);margin:auto;padding:22px 28px 32px;display:grid;grid-template-columns:240px minmax(440px,1fr) 250px;gap:22px;align-items:start}.test-topic-panel,.question-palette,.test-question-card,.performance-card,.review-callout{border:1px solid var(--line);border-radius:12px;background:#fff}.test-topic-panel,.question-palette{align-self:start;padding:18px 18px 16px;position:sticky;top:var(--test-sticky-top);z-index:5;max-height:calc(100dvh - var(--test-sticky-top) - 16px);overflow:hidden}.eyebrow{color:var(--teal);font-size:10px;font-weight:800;letter-spacing:.11em}.test-topic-panel h2{margin:5px 0;font-family:Georgia,serif;font-size:20px}.test-topic-panel>p{margin:0 0 22px;color:var(--muted);font-size:11px}.question-palette{display:flex;flex-direction:column}.palette-head{flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:8px;padding-bottom:2px}.palette-head h2{margin:0;font-size:15px;font-weight:750;letter-spacing:-.02em;white-space:nowrap}.palette-head span{color:var(--muted);font-size:12px;font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}.palette-scroll{flex:1 1 auto;min-height:0;margin:12px -4px;padding:7px 8px 6px;overflow-y:auto}.palette-actions{flex:0 0 auto;padding-top:12px;border-top:1px solid var(--line)}.palette-actions small{margin-top:9px;display:block;color:var(--muted);font-size:9px;text-align:center}.test-topic-progress{margin:15px 0}.test-topic-progress>div{display:flex;justify-content:space-between;gap:8px;font-size:11px}.test-topic-progress>div span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.test-topic-progress>div strong{color:var(--muted)}.test-topic-progress>i,.performance-row>i{height:5px;margin-top:7px;display:block;overflow:hidden;border-radius:10px;background:#e7ecea}.test-topic-progress b,.performance-row b{height:100%;display:block;border-radius:inherit;background:var(--teal)}.test-legend{margin-top:24px;padding-top:16px;display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--line);color:var(--muted);font-size:10px}.test-legend span{display:flex;align-items:center;gap:7px}.test-legend i{width:9px;height:9px;border:1px solid var(--line-dark);border-radius:2px}.test-legend i.answered{border-color:var(--teal);background:var(--teal)}.test-legend i.review{border-color:#d39327;background:#fff2d7}.test-question-card{position:relative;min-height:690px;padding:30px 38px}.test-question-meta{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:11px}.test-question-meta span+span{padding-left:18px;border-left:1px solid var(--line)}.test-question-card h1{max-width:850px;margin:30px 0 7px;font-family:Georgia,serif;font-size:25px;line-height:1.45}.test-question-card>.question-tamil{margin-bottom:24px}.test-options{display:flex;flex-direction:column;gap:10px}.test-options button{min-height:66px;padding:11px 14px;display:grid;grid-template-columns:35px 1fr;align-items:center;gap:12px;border:1px solid var(--line);border-radius:9px;background:#fff;text-align:left;cursor:pointer}.test-options button>span{width:31px;height:31px;display:grid;place-items:center;border:1px solid var(--line-dark);border-radius:50%;font-weight:750}.test-options button div{display:flex;flex-direction:column;gap:4px}.test-options button strong{font-size:14px}.test-options button small{color:var(--muted);font-size:12px}.test-options button.selected{border-color:var(--teal);background:var(--mint-soft)}.test-options button.selected>span{color:#fff;border-color:var(--teal);background:var(--teal)}.test-question-footer{margin-top:30px;padding-top:20px;display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line)}.test-question-footer>div{display:flex;gap:8px}.test-question-footer button,.result-actions button,.review-callout button{height:42px;padding:0 14px;display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line-dark);border-radius:7px;background:#fff;font-size:12px;font-weight:720;cursor:pointer}.test-question-footer svg,.result-actions svg{width:16px}.test-question-footer button.primary,.result-actions .primary{color:#fff;border-color:var(--teal);background:var(--teal)}.test-question-footer .mark.active{color:#8b5700;border-color:#e4bd72;background:#fff8e9}.test-side-arrow{position:absolute;top:48%}.test-side-arrow.previous{left:-22px}.test-side-arrow.next{right:-22px}.palette-grid{margin:0;display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.palette-grid button{aspect-ratio:1;border:1px solid var(--line-dark);border-radius:5px;background:#fff;font-size:11px;font-weight:700;cursor:pointer}.palette-grid button.answered{color:#fff;border-color:var(--teal);background:var(--teal)}.palette-grid button.marked{box-shadow:inset 0 -4px #e7a52f}.palette-grid button.current{outline:none;box-shadow:0 0 0 2px #fff,0 0 0 4px #10243e}.palette-grid button.current.marked{box-shadow:inset 0 -4px #e7a52f,0 0 0 2px #fff,0 0 0 4px #10243e}.submit-test{width:100%;height:44px;display:flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:7px;color:#fff;background:var(--teal);font-size:12px;font-weight:750;cursor:pointer}.submit-test svg{width:16px}.question-palette>small{margin-top:9px;display:block;color:var(--muted);font-size:9px;text-align:center}.results-page{max-width:1080px;margin:auto;padding:38px 28px 60px}.result-hero{padding:30px 36px;display:flex;align-items:center;gap:34px;border:1px solid var(--line);border-radius:14px;color:var(--ink);background:var(--mint-soft)}.score-ring{--score: 0deg;flex:0 0 auto;width:146px;height:146px;display:grid;place-items:center;border-radius:50%;background:conic-gradient(var(--teal) var(--score),#e2e9e6 0)}.score-ring:before{content:"";grid-area:1/1;width:116px;height:116px;border-radius:50%;background:var(--mint-soft)}.score-ring span{grid-area:1/1;z-index:1;text-align:center}.score-ring strong{color:var(--teal-dark);font-family:Georgia,serif;font-size:42px}.score-ring small{color:var(--muted)}.result-hero .eyebrow{color:var(--teal)}.result-hero h1{margin:7px 0;font-family:Georgia,serif;font-size:30px}.result-hero p{margin:0;color:var(--muted);font-size:13px}.result-chips{margin-top:18px;display:flex;flex-wrap:wrap;gap:8px}.result-chips span{padding:7px 10px;display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:7px;color:#33475a;background:#fff;font-size:10px;font-weight:650}.result-chips svg{width:14px;color:var(--teal)}.performance-card{margin-top:22px;padding:25px 30px}.section-heading{display:flex;align-items:end;justify-content:space-between}.section-heading h2{margin:5px 0 0;font-family:Georgia,serif}.section-heading>strong{color:var(--teal)}.performance-table{margin-top:18px}.performance-row{padding:14px 0;display:grid;grid-template-columns:2fr 55px 1fr 55px;align-items:center;gap:16px;border-top:1px solid var(--line)}.performance-row>div{display:flex;flex-direction:column;gap:3px}.performance-row small{color:var(--muted);font-size:10px}.performance-row>i{margin:0}.performance-row>span{font-size:12px}.performance-row .good{color:var(--teal)}.performance-row .needs-work{color:var(--amber)}.review-callout{margin-top:18px;padding:18px 22px;display:flex;align-items:center;justify-content:space-between;gap:20px}.review-callout p{margin:5px 0 0;color:var(--muted);font-family:Georgia,serif;font-size:13px}.review-callout button{flex:0 0 auto;color:var(--teal-dark);border-color:var(--teal)}.result-actions{margin-top:20px;display:flex;justify-content:flex-end;gap:9px}@media(max-width:1300px){.test-page{grid-template-columns:215px minmax(440px,1fr)}.test-topic-panel,.question-palette{position:static;max-height:none;overflow:visible}.question-palette{grid-column:1}.test-question-card{grid-row:1 / span 2;grid-column:2}.test-side-arrow{display:none}}@media(max-width:1180px){.question-side-arrow.previous{left:252px}.question-side-arrow.next{right:12px}}@media(max-width:900px){.unit-pill{display:none}.mode-switch button{min-width:66px}.test-page{display:block;padding:16px}.test-topic-panel{position:static;margin-bottom:12px}.test-topic-panel .test-topic-progress,.test-legend{display:none}.test-question-card{min-height:0;padding:24px 22px}.question-palette{position:static;max-height:none;margin-top:12px;padding:16px}.palette-scroll{max-height:200px;margin:12px 0}.palette-grid{grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px}.palette-grid button{aspect-ratio:auto;height:38px;border-radius:7px;font-size:12px}.test-side-arrow,.question-side-arrow{display:none}.results-page{padding:20px 15px 40px}.result-hero{padding:25px}.performance-row{grid-template-columns:1.5fr 42px 1fr 42px;gap:8px}}@media(max-width:620px){.topbar .bookmark-summary,.topbar .test-timer span{display:none}.brand-title{font-size:12px}.mode-switch{margin-left:auto}.mode-switch button{min-width:54px;height:31px;font-size:11px}.test-timer{margin-left:8px}.test-question-card h1{font-size:21px}.test-question-footer{flex-direction:column}.test-question-footer>div{justify-content:flex-end}.result-hero{flex-direction:column;align-items:flex-start}.score-ring{width:120px;height:120px}.score-ring:before{width:94px;height:94px}.score-ring strong{font-size:35px}.performance-card{padding:20px 15px}.performance-row{grid-template-columns:1fr 38px}.performance-row>i{grid-column:1 / -1;grid-row:2}.performance-row>strong{grid-column:2;grid-row:1}.review-callout{align-items:flex-start;flex-direction:column}.result-actions{flex-wrap:wrap}}@media(max-width:820px){.topbar .brand-group{min-width:0;gap:6px}.topbar .brand-title{overflow:hidden;font-size:12px;text-overflow:ellipsis;white-space:nowrap}}@media(max-width:460px){.topbar .brand-title{font-size:13px}.paper-picker select{width:100%;max-width:none}.mode-switch button{min-width:46px}}.test-setup{max-width:880px;margin:auto;padding:34px 24px 70px}.setup-hero{margin-bottom:22px}.setup-hero h1{margin:6px 0 8px;font-family:Georgia,serif;font-size:30px}.setup-hero p{margin:0;color:var(--muted);font-size:13px}.setup-card{margin-bottom:14px;padding:20px 22px;border:1px solid var(--line);border-radius:12px;background:#fff}.setup-card h2{margin:0 0 14px;display:flex;align-items:center;gap:10px;font-family:Georgia,serif;font-size:17px}.setup-card h2 span{flex:0 0 auto;width:24px;height:24px;display:grid;place-items:center;border-radius:50%;color:#fff;background:var(--teal);font-family:system-ui,sans-serif;font-size:12px;font-weight:800}.setup-card h2 em{color:var(--muted);font-family:system-ui,sans-serif;font-size:11px;font-style:normal;font-weight:500}.setup-card select{width:100%;height:42px;padding:0 10px;border:1px solid var(--line-dark);border-radius:8px;background:#fff;font-size:13px}.unit-choice-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:9px}.unit-choice-grid button{padding:11px 13px;display:flex;flex-direction:column;gap:3px;border:1px solid var(--line-dark);border-radius:9px;background:#fff;text-align:left;cursor:pointer}.unit-choice-grid button strong{color:var(--teal-dark);font-size:11px}.unit-choice-grid button span{font-size:12px;font-weight:650;line-height:1.35}.unit-choice-grid button small{color:var(--muted);font-size:10px}.unit-choice-grid button.selected{border-color:var(--teal);background:var(--mint-soft);box-shadow:inset 0 0 0 1px var(--teal)}.section-picker{border-top:1px solid var(--line)}.section-picker:first-of-type{border-top:0}.section-picker>button{width:100%;padding:12px 2px;display:flex;align-items:center;justify-content:space-between;gap:10px;border:0;background:transparent;font-size:13px;font-weight:700;cursor:pointer}.section-picker>button svg{width:16px;transition:transform .16s ease}.section-picker.open>button svg{transform:rotate(180deg)}.section-chip-row{padding:2px 0 14px;display:flex;flex-wrap:wrap;gap:8px}.section-chip-row button{padding:8px 11px;display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line-dark);border-radius:30px;background:#fff;font-size:11px;font-weight:600;cursor:pointer}.section-chip-row button small{color:var(--muted)}.section-chip-row button.selected{color:var(--teal-dark);border-color:var(--teal);background:var(--mint-soft)}.count-row{margin-bottom:22px;display:flex;flex-wrap:wrap;gap:8px}.count-row button,.count-custom{min-width:72px;padding:9px 12px;display:flex;flex-direction:column;gap:1px;border:1px solid var(--line-dark);border-radius:9px;background:#fff;text-align:left;cursor:pointer}.count-row strong{color:var(--teal-dark);font-size:15px}.count-row small{color:var(--muted);font-size:10px}.count-row button.selected,.count-custom.selected{border-color:var(--teal);background:var(--mint-soft);box-shadow:inset 0 0 0 1px var(--teal)}.count-custom input{width:72px;margin:2px 0;padding:3px 6px;border:1px solid var(--line-dark);border-radius:6px;font-size:14px;font-weight:700}.wizard-subhead{margin-top:6px}.wizard-tally small{margin-left:2px;color:var(--muted);font-size:11px;font-weight:600}.pace-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:9px}.pace-row button,.pace-custom{padding:11px 12px;display:flex;flex-direction:column;gap:2px;border:1px solid var(--line-dark);border-radius:9px;background:#fff;text-align:left;cursor:pointer}.pace-row strong{color:var(--teal-dark);font-size:16px}.pace-row span{font-size:11px;font-weight:700}.pace-row small{color:var(--muted);font-size:10px}.pace-row button.selected,.pace-custom.selected{border-color:var(--teal);background:var(--mint-soft);box-shadow:inset 0 0 0 1px var(--teal)}.pace-custom input{width:100%;margin:2px 0;padding:4px 6px;border:1px solid var(--line-dark);border-radius:6px;font-size:14px;font-weight:700}.shuffle-toggle{margin-top:14px;display:flex;align-items:center;gap:8px;color:#33475a;font-size:12px;font-weight:600;cursor:pointer}.shuffle-toggle svg{width:15px;color:var(--teal-dark)}.setup-summary{position:sticky;bottom:12px;margin-top:18px;padding:15px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;border:1px solid var(--line);border-radius:12px;background:#10303f;color:#fff;box-shadow:0 12px 30px #10243e40}.setup-summary>div{display:flex;flex-wrap:wrap;gap:6px 22px}.setup-summary span{display:flex;align-items:center;gap:7px;font-size:12px;color:#c8dadd}.setup-summary strong{color:#fff;font-size:14px}.setup-summary svg{width:15px;color:#72d5b5}.start-test{flex:0 0 auto;height:44px;padding:0 20px;display:inline-flex;align-items:center;gap:8px;border:0;border-radius:8px;color:#08312a;background:#59d6ac;font-size:13px;font-weight:800;cursor:pointer}.start-test:disabled{opacity:.45;cursor:not-allowed}.start-test svg{width:16px}.palette-grid button.visited{color:#8c2f24;border-color:#d2604f;background:#fdeae6}.test-legend i.not-answered{border-color:#d2604f;background:#fdeae6}.review-card .section-heading{flex-wrap:wrap;gap:12px}.review-filters{display:flex;align-items:center;flex-wrap:wrap;gap:7px;color:var(--muted)}.review-filters svg{width:15px}.review-filters button{padding:7px 11px;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line-dark);border-radius:30px;background:#fff;font-size:11px;font-weight:700;cursor:pointer}.review-filters button small{color:var(--muted)}.review-filters button.active{color:#fff;border-color:var(--teal);background:var(--teal)}.review-filters button.active small{color:#d3efe4}.review-list{margin-top:16px}.review-empty{padding:24px 0;color:var(--muted);text-align:center;font-size:13px}.review-row{padding:16px 14px;border-top:1px solid var(--line)}.review-row.wrong{background:snow;box-shadow:inset 3px 0 #d2604f}.review-row.skipped{background:#fffdf6;box-shadow:inset 3px 0 #e0b25f}.review-row-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.review-row-head small{color:var(--muted);font-size:10px;text-align:right}.review-badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:800}.review-badge svg{width:15px}.review-badge.correct{color:#0d7a5f}.review-badge.wrong{color:#b33f31}.review-badge.skipped{color:#9a6b14}.review-prompt{margin:9px 0 10px;font-family:Georgia,serif;font-size:14px;line-height:1.55}.review-answers{display:flex;flex-direction:column;gap:5px;font-size:12px}.review-answers .good{color:#0d7a5f}.review-answers .bad{color:#b33f31}.review-answers strong{font-weight:800}.review-study{margin-top:10px;padding:7px 11px;display:inline-flex;align-items:center;gap:7px;border:1px solid var(--teal);border-radius:7px;color:var(--teal-dark);background:#fff;font-size:11px;font-weight:750;cursor:pointer}.review-study svg{width:14px}@media(max-width:620px){.test-setup{padding:22px 14px 90px}.setup-summary{flex-direction:column;align-items:stretch}.start-test{justify-content:center}.review-row-head{flex-direction:column;align-items:flex-start;gap:4px}.review-row-head small{text-align:left}}.sidebar,.palette-scroll,.bookmark-drawer,.review-list,.wizard-panel{scrollbar-width:thin;scrollbar-color:transparent transparent}.sidebar::-webkit-scrollbar,.palette-scroll::-webkit-scrollbar,.bookmark-drawer::-webkit-scrollbar,.review-list::-webkit-scrollbar,.wizard-panel::-webkit-scrollbar{width:8px;height:8px}.sidebar::-webkit-scrollbar-thumb,.palette-scroll::-webkit-scrollbar-thumb,.bookmark-drawer::-webkit-scrollbar-thumb,.review-list::-webkit-scrollbar-thumb,.wizard-panel::-webkit-scrollbar-thumb{border:2px solid transparent;border-radius:99px;background-color:transparent;background-clip:content-box;transition:background-color .25s ease}.sidebar:hover,.palette-scroll:hover,.bookmark-drawer:hover,.review-list:hover,.wizard-panel:hover{scrollbar-color:rgba(96,112,134,.42) transparent}.sidebar:hover::-webkit-scrollbar-thumb,.sidebar:focus-within::-webkit-scrollbar-thumb,.palette-scroll:hover::-webkit-scrollbar-thumb,.bookmark-drawer:hover::-webkit-scrollbar-thumb,.review-list:hover::-webkit-scrollbar-thumb,.wizard-panel:hover::-webkit-scrollbar-thumb{background-color:#6070866b}.sidebar::-webkit-scrollbar-thumb:hover,.palette-scroll::-webkit-scrollbar-thumb:hover{background-color:#607086ad}.test-setup.wizard{max-width:780px;display:flex;flex-direction:column;padding-bottom:40px}.wizard .setup-hero{margin-bottom:18px}.wizard-steps{margin:0 0 18px;padding:0;display:flex;gap:6px;list-style:none;overflow-x:auto;scrollbar-width:none}.wizard-steps::-webkit-scrollbar{display:none}.wizard-step{flex:1 1 0;min-width:92px}.wizard-step button{width:100%;padding:11px 12px;display:flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:10px;background:#fff;text-align:left;cursor:pointer;transition:border-color .18s,background .18s}.wizard-step button:disabled{cursor:not-allowed;opacity:.72}.wizard-dot{flex:0 0 auto;width:26px;height:26px;display:grid;place-items:center;border-radius:50%;color:var(--muted);background:#eef2f4;font-size:12px;font-weight:800}.wizard-dot svg{width:15px;height:15px;stroke-width:3}.wizard-step-copy{display:flex;flex-direction:column;line-height:1.2;min-width:0}.wizard-step-copy strong{font-size:13px}.wizard-step-copy small{color:var(--muted);font-size:10px}.wizard-step.current button{border-color:var(--teal);background:var(--mint-soft);box-shadow:inset 0 0 0 1px var(--teal)}.wizard-step.current .wizard-dot{color:#fff;background:var(--teal)}.wizard-step.done .wizard-dot{color:#fff;background:var(--teal-dark)}.wizard-step.done strong{color:var(--teal-dark)}.wizard-panel{padding:26px 26px 24px;border:1px solid var(--line);border-radius:14px;background:#fff}.wizard-body{animation:wizard-fade .22s ease}@keyframes wizard-fade{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.wizard-body h2{margin:0 0 4px;display:flex;align-items:baseline;gap:10px;font-family:Georgia,serif;font-size:21px}.wizard-body h2 em{color:var(--muted);font-family:system-ui,sans-serif;font-size:11px;font-style:normal;font-weight:500}.wizard-hint{margin:0 0 18px;color:var(--muted);font-size:12px}.paper-choice-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}.paper-choice-grid button{padding:14px 15px;display:flex;flex-direction:column;gap:4px;border:1px solid var(--line-dark);border-radius:10px;background:#fff;text-align:left;cursor:pointer;transition:border-color .16s,background .16s}.paper-choice-grid button strong{font-size:13px;font-weight:700;line-height:1.35}.paper-choice-grid button small{color:var(--muted);font-size:11px}.paper-choice-grid button:hover{border-color:#9bc8ba}.paper-choice-grid button.selected{border-color:var(--teal);background:var(--mint-soft);box-shadow:inset 0 0 0 1px var(--teal)}.paper-choice-grid button.selected strong{color:var(--teal-dark)}.wizard .section-picker:first-of-type{border-top:1px solid var(--line)}.wizard-review{margin:0;display:grid;gap:2px}.wizard-review>div{display:grid;grid-template-columns:120px 1fr;gap:14px;padding:12px 2px;border-top:1px solid var(--line)}.wizard-review>div:first-child{border-top:0}.wizard-review dt{color:var(--muted);font-size:12px;font-weight:600}.wizard-review dd{margin:0;font-size:13px;font-weight:650}.wizard-review>div:last-child dd{color:var(--teal-dark);font-weight:800}.wizard-footer{position:sticky;bottom:12px;margin-top:16px;padding:13px 18px;display:flex;align-items:center;justify-content:space-between;gap:16px;border:1px solid var(--line);border-radius:12px;background:#fff;box-shadow:0 10px 26px #10243e1a}.wizard-tally{display:flex;gap:18px}.wizard-tally span{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:12px}.wizard-tally strong{color:var(--ink);font-size:14px}.wizard-tally svg{width:15px;color:var(--teal)}.wizard-nav{display:flex;gap:10px}.wizard-back,.wizard-next{height:44px;padding:0 18px;display:inline-flex;align-items:center;gap:8px;border-radius:8px;font-size:13px;font-weight:750;cursor:pointer}.wizard-back{border:1px solid var(--line-dark);color:var(--muted);background:#fff}.wizard-back:hover:not(:disabled){color:var(--ink);background:#f4f7f8}.wizard-back:disabled{opacity:.4;cursor:not-allowed}.wizard-next{border:0;color:#fff;background:var(--teal);font-weight:800}.wizard-next:hover:not(:disabled){background:var(--teal-dark)}.wizard-next:disabled{opacity:.45;cursor:not-allowed}.wizard-back svg,.wizard-next svg{width:16px}.review-prompt-ta{margin:-4px 0 10px;color:#46586c;font-size:13px;line-height:1.6}.review-options{margin:4px 0 0;padding:0;list-style:none;display:grid;gap:6px}.review-options li{display:grid;grid-template-columns:24px 1fr auto;align-items:center;gap:10px;padding:9px 11px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:13px}.review-opt-key{width:22px;height:22px;display:grid;place-items:center;border:1px solid var(--line-dark);border-radius:50%;font-size:11px;font-weight:750}.review-opt-text{min-width:0;color:#26384c}.review-opt-tag{display:inline-flex;align-items:center;gap:4px;font-size:10px;font-weight:800;white-space:nowrap}.review-opt-tag svg{width:13px;height:13px;stroke-width:3}.review-opt-tag.good{color:var(--teal-dark)}.review-opt-tag.bad{color:var(--danger)}.review-options li.correct{border-color:#9ccbbb;background:var(--mint-soft)}.review-options li.correct .review-opt-key{color:#fff;border-color:var(--teal);background:var(--teal)}.review-options li.chosen-wrong{border-color:#d88682;background:var(--danger-bg)}.review-options li.chosen-wrong .review-opt-key{color:#fff;border-color:var(--danger);background:var(--danger)}.review-skip-note{margin:8px 0 0;color:#9a6b14;font-size:12px;font-weight:650}.review-explain{margin-top:12px}.review-explain-toggle{width:100%;padding:9px 12px;display:flex;align-items:center;gap:8px;border:1px solid var(--line-dark);border-radius:8px;color:var(--teal-dark);background:#fff;font-size:12px;font-weight:720;cursor:pointer}.review-explain-toggle:hover{background:var(--mint-soft)}.review-explain-toggle svg{width:15px}.review-explain-chevron{margin-left:auto;transition:transform .18s ease}.review-explain.open .review-explain-chevron{transform:rotate(180deg)}.review-explain-body{padding:16px 4px 4px}.review-explain-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.review-explain-grid article+article{padding-left:24px;border-left:1px solid var(--line)}.review-explain-grid h4{margin:0 0 6px;color:var(--teal-dark);font-size:12px}.review-explain-grid p{margin:0;color:#304357;font-family:Georgia,Times New Roman,serif;font-size:13px;line-height:1.7}.review-explain-grid article[lang=ta] p{font-family:Noto Sans Tamil,Nirmala UI,sans-serif;font-size:12.5px;line-height:1.85}.review-takeaway{margin:16px 0 0;padding:11px 13px;display:flex;gap:9px;border:1px solid #dbe6d0;border-radius:7px;background:#fafdf7;color:#314637;font-size:12px;line-height:1.6}.review-takeaway svg{flex:0 0 auto;width:17px;height:17px;color:#8c6d08}.review-explain-body .review-study{margin-top:14px}@media(max-width:720px){.review-explain-grid{grid-template-columns:1fr;gap:16px}.review-explain-grid article+article{padding:16px 0 0;border-top:1px solid var(--line);border-left:0}.review-options li{grid-template-columns:22px 1fr}.review-opt-tag{grid-column:2;justify-self:start}}@media(max-width:720px){.wizard-step{min-width:0}.wizard-step button{flex-direction:column;align-items:center;gap:5px;padding:9px 6px;text-align:center}.wizard-step-copy{align-items:center}.wizard-step-copy small{display:none}.wizard-panel{padding:20px 16px}.wizard-footer{flex-direction:column;align-items:stretch;gap:12px;padding:14px}.wizard-tally{justify-content:center}.wizard-nav{display:grid;grid-template-columns:1fr 1.4fr}.wizard-back,.wizard-next{justify-content:center}}.subject-switch{display:flex;padding:3px;border:1px solid var(--line);border-radius:9px;background:#f5f7f8}.subject-switch button{display:flex;align-items:center;gap:6px;min-width:0;height:34px;padding:0 13px;border:0;border-radius:6px;color:var(--muted);background:transparent;font-size:12.5px;font-weight:720;white-space:nowrap;cursor:pointer}.subject-switch button svg{width:15px;height:15px}.subject-switch button.active{color:#fff;background:var(--ink);box-shadow:0 2px 6px #10243e2e}.guide-return{margin:0 0 14px;padding:8px 13px;display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line-dark);border-radius:999px;color:var(--teal-dark);background:var(--mint-soft);font-size:12px;font-weight:700;cursor:pointer}.guide-return:hover{border-color:var(--teal);background:var(--mint)}.guide-return svg{width:15px;height:15px}.section-guide{grid-column:2 / -1;max-width:920px;width:100%;margin:0 auto;padding:40px 32px 80px}.guide-head{text-align:center;padding-bottom:28px;border-bottom:1px solid var(--line);margin-bottom:32px}.guide-kicker{display:inline-block;color:var(--teal-dark);background:var(--mint-soft);padding:5px 14px;border-radius:999px;border:1px solid var(--line);font-size:11.5px;font-weight:780;letter-spacing:.06em;text-transform:uppercase;margin-bottom:14px}.guide-head h1{margin:4px 0 0;font-size:32px;font-weight:800;line-height:1.25;color:var(--ink)}.guide-title-ta{margin:8px 0 0;color:var(--teal-dark);font-size:20px;font-weight:650}.guide-count{margin:12px 0 0;color:var(--muted);font-size:13px;font-weight:600}.guide-block{margin-top:38px}.guide-block h2{display:flex;align-items:center;gap:10px;margin:0 0 16px;font-size:18px;font-weight:750;color:var(--ink);padding-bottom:8px;border-bottom:1px solid #edf2f0}.guide-block h2 svg{width:20px;height:20px;color:var(--teal)}.guide-block h2 small{color:var(--muted);font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;margin-left:auto}.guide-overview{background:#f7faf9;border:1px solid #dce8e4;border-radius:12px;padding:24px 28px}.guide-overview h2{border-bottom:0;padding-bottom:0;margin-bottom:14px}.guide-ta-lead{margin:0;font-size:15.5px;line-height:1.95;color:#1b2f42}.guide-para{margin:0}.guide-para+.guide-para{margin-top:12px}.guide-para+.guide-overview-list{margin-top:14px}.guide-overview-list+.guide-para{margin-top:16px}.guide-overview-list{margin:14px 0;padding:0;list-style:none;display:grid;gap:10px}.guide-overview-item{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;border:1px solid #dcebe6;border-radius:9px;background:#fff;box-shadow:0 1px 3px #00000005;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}.guide-overview-item:hover{transform:translateY(-1px);border-color:#b7dbd0;box-shadow:0 3px 8px #087a5b0d}.guide-overview-num{flex-shrink:0;display:grid;place-content:center;width:24px;height:24px;border-radius:50%;color:#fff;background:var(--teal);font-size:12px;font-weight:750;margin-top:3px}.guide-overview-text{flex:1;font-size:15px;line-height:1.8;color:#1b2f42}.guide-en{margin:16px 0 0;padding-top:16px;border-top:1px dashed #dce8e4;color:#55697d;font-size:13.5px;line-height:1.75}.guide-en .guide-overview-list{margin:12px 0;gap:8px}.guide-en .guide-overview-item{padding:10px 14px;border-color:#dbe7f2;background:#fbfdff}.guide-en .guide-overview-item:hover{border-color:#bad3e8;box-shadow:0 3px 8px #1e50780d}.guide-en .guide-overview-num{background:#3b6e8c;width:21px;height:21px;font-size:11px;margin-top:2px}.guide-en .guide-overview-text{font-size:13px;line-height:1.65;color:#4a6176}.guide-list{margin:0;padding:0;list-style:none;display:grid;gap:14px}.guide-list-item{padding:16px 20px;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:10px;background:#fff;box-shadow:0 1px 3px #00000005;transition:transform .15s ease,box-shadow .15s ease}.guide-list-item:hover{transform:translateY(-1px);box-shadow:0 3px 8px #0000000a}.guide-shortcuts .guide-list-item{border-left-color:#d99a26;background:#fffdf8;border-color:#f0e4cc}.guide-pitfalls .guide-list-item{border-left-color:#d94841;background:#fff9f8;border-color:#f5d4d2}.guide-steps{margin:0;padding:0;list-style:none;counter-reset:guide-step;display:grid;gap:14px}.guide-step-item{position:relative;padding:16px 20px 16px 58px;counter-increment:guide-step;border:1px solid var(--line);border-radius:10px;background:#fff;box-shadow:0 1px 3px #00000005}.guide-step-item:before{content:counter(guide-step);position:absolute;top:16px;left:16px;display:grid;place-content:center;width:28px;height:28px;border-radius:50%;color:#fff;background:var(--teal);font-size:13px;font-weight:780}.guide-item-ta{font-size:15px;line-height:1.85;color:#1b2f42}.guide-item-en{margin-top:8px;color:#5e7388;font-size:12.5px;line-height:1.65}.guide-formulas{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:16px}.formula-card{padding:20px 22px;border:1px solid #d6e8e2;border-radius:12px;background:#f7faf8;box-shadow:0 1px 3px #00000005;display:flex;flex-direction:column;align-items:center;justify-content:space-between;text-align:center;min-width:0;transition:transform .15s ease,border-color .15s ease}.formula-card:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:0 4px 12px #087a5b0f}.formula-label-ta{font-size:14px;font-weight:700;color:#164e3d;line-height:1.4}.formula-math{margin:14px 0;width:100%;text-align:center;overflow-x:auto;overflow-y:hidden;scrollbar-width:thin}.formula-math .math-text,.formula-math .math-display{display:inline-block;max-width:100%}.formula-math .katex-display{margin:4px 0}.formula-math .katex{font-size:1.18em;line-height:1.35}.formula-label-en{margin-top:4px;color:#5a7369;font-size:12px;font-weight:550}.guide-start{margin-top:42px;padding:16px 28px;display:flex;align-items:center;justify-content:center;width:100%;border:0;border-radius:10px;color:#fff;background:var(--teal);font-size:15px;font-weight:750;cursor:pointer;box-shadow:0 3px 10px #087a5b38;transition:background .15s ease,transform .15s ease}.guide-start:hover{background:var(--teal-dark);transform:translateY(-1px)}.ratio-unit{fill:#cfe6dc;stroke:var(--teal);stroke-width:1.5}.ratio-unit.alt{fill:#f2e3c6;stroke:#b5892f}.source-collection dd{font-size:10px;line-height:1.45}@media(max-width:1180px){.section-guide{grid-column:2 / -1;padding:30px 20px 60px}}@media(max-width:820px){.section-guide{max-width:none;padding:20px 14px 48px}.guide-head h1{font-size:26px}.guide-formulas{grid-template-columns:1fr}}