@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:"0.18.4"}.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>.katex-newline{display:block}.katex .katex-base{position:relative;white-space:nowrap;width:-webkit-min-content;width:-moz-min-content;width:min-content}.katex .katex-base,.katex .katex-strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;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 .katex-vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .katex-thinbox{display:inline-flex;flex-direction:row;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 .katex-hdashline,.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-rule,.katex .katex-underline .underline-line,.katex .mfrac .frac-line{min-height:1px}.katex .mspace{display:inline-block}.katex .katex-smash{display:inline;line-height:0}.katex .clap,.katex .llap,.katex .rlap{position:relative;width:0}.katex .clap>.katex-inner,.katex .llap>.katex-inner,.katex .rlap>.katex-inner{position:absolute}.katex .clap>.katex-fix,.katex .llap>.katex-fix,.katex .rlap>.katex-fix{display:inline-block}.katex .llap>.katex-inner{right:0}.katex .clap>.katex-inner,.katex .rlap>.katex-inner{left:0}.katex .clap>.katex-inner>span{margin-left:-50%;margin-right:50%}.katex .katex-rule{border:0 solid;display:inline-block;position:relative}.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-underline .underline-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .katex-hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.katex-root{margin-left:.2777777778em;margin-right:-.5555555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .katex-sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .katex-sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .katex-sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .katex-sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .katex-sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .katex-sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .katex-sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .katex-sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .katex-sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .katex-sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .katex-sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .katex-sizing.reset-size2.size1{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .katex-sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .katex-sizing.reset-size2.size3{font-size:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .katex-sizing.reset-size2.size4{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .katex-sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .katex-sizing.reset-size2.size6{font-size:1.6666666667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .katex-sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .katex-sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .katex-sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .katex-sizing.reset-size2.size10{font-size:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .katex-sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .katex-sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .katex-sizing.reset-size3.size2{font-size:.8571428571em}.katex .fontsize-ensurer.reset-size3.size3,.katex .katex-sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .katex-sizing.reset-size3.size4{font-size:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .katex-sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .katex-sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .katex-sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .katex-sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .katex-sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .katex-sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .katex-sizing.reset-size3.size11{font-size:3.5542857143em}.katex .fontsize-ensurer.reset-size4.size1,.katex .katex-sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .katex-sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .katex-sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .katex-sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .katex-sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .katex-sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .katex-sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .katex-sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .katex-sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .katex-sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .katex-sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .katex-sizing.reset-size5.size1{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .katex-sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .katex-sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .katex-sizing.reset-size5.size4{font-size:.8888888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .katex-sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .katex-sizing.reset-size5.size6{font-size:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .katex-sizing.reset-size5.size7{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .katex-sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .katex-sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .katex-sizing.reset-size5.size10{font-size:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .katex-sizing.reset-size5.size11{font-size:2.7644444444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .katex-sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .katex-sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .katex-sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .katex-sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .katex-sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .katex-sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .katex-sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .katex-sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .katex-sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .katex-sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .katex-sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .katex-sizing.reset-size7.size1{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .katex-sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .katex-sizing.reset-size7.size3{font-size:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .katex-sizing.reset-size7.size4{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .katex-sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .katex-sizing.reset-size7.size6{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .katex-sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .katex-sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .katex-sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .katex-sizing.reset-size7.size10{font-size:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .katex-sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .katex-sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .katex-sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .katex-sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .katex-sizing.reset-size8.size4{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .katex-sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .katex-sizing.reset-size8.size6{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .katex-sizing.reset-size8.size7{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .katex-sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .katex-sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .katex-sizing.reset-size8.size10{font-size:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .katex-sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .katex-sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .katex-sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .katex-sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .katex-sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .katex-sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .katex-sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .katex-sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .katex-sizing.reset-size9.size8{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .katex-sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .katex-sizing.reset-size9.size10{font-size:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .katex-sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .katex-sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .katex-sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .katex-sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .katex-sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .katex-sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .katex-sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .katex-sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .katex-sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .katex-sizing.reset-size10.size9{font-size:.8331726133em}.katex .fontsize-ensurer.reset-size10.size10,.katex .katex-sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .katex-sizing.reset-size10.size11{font-size:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .katex-sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .katex-sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .katex-sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .katex-sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .katex-sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .katex-sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .katex-sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .katex-sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .katex-sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .katex-sizing.reset-size11.size10{font-size:.8336012862em}.katex .fontsize-ensurer.reset-size11.size11,.katex .katex-sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{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 .katex-accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .katex-accent .accent-body{position:relative}.katex .katex-accent .accent-body:not(.accent-full){width:0}.katex .katex-overlay{display:block}.katex .mtable .vertical-separator{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 .katex-stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .katex-stretchy:after,.katex .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 .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>.katex-tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.katex-tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}:root{--bg: #f7f8fa;--surface: #ffffff;--text: #1a1d24;--muted: #6b7280;--border: #e5e7eb;--primary: #4f6ef7;--primary-ink: #ffffff;--danger: #dc2626;--assisted: #b45309;--solo: #15803d;--surface-raised: #ffffff;--surface-soft: #f0f3f8;--chat-bg: #e8edf3;--bubble-assistant: #ffffff;--bubble-user: #4f6ef7;--sidebar-active: #e9edff;--shadow: 0 8px 30px rgba(24, 31, 50, .08);--radius: 12px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);font-size:16px}:root[data-theme=dark]{color-scheme:dark;--bg: #0f1115;--surface: #171a21;--surface-raised: #20242d;--surface-soft: #262b35;--text: #f3f5f7;--muted: #9ca5b4;--border: #2d333e;--primary: #6f8cff;--primary-ink: #ffffff;--danger: #ff6b75;--assisted: #d89532;--solo: #36a76c;--chat-bg: #0d1015;--bubble-assistant: #20242d;--bubble-user: #536fdf;--sidebar-active: #29324b;--shadow: 0 12px 36px rgba(0, 0, 0, .28)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}button,input,select{font:inherit;font-size:16px}button{min-height:44px;min-width:44px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:var(--radius);padding:0 14px;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}input,select{min-height:44px;width:100%;padding:0 12px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text)}label{display:flex;flex-direction:column;gap:6px;font-size:16px}h1{font-size:22px;margin:0 0 12px}h2{font-size:18px;margin:0 0 8px}.cta{background:var(--primary);color:var(--primary-ink);border-color:var(--primary);font-weight:600}.danger{background:var(--surface);color:var(--danger);border-color:var(--danger)}.link{border:none;background:none;color:var(--primary);padding:0;min-height:44px;text-decoration:underline}.app-shell{display:flex;flex-direction:column;height:100%}.app-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:calc(4px + var(--safe-top)) 16px 4px;background:var(--surface);border-bottom:1px solid var(--border);min-height:40px;flex-shrink:0}.app-header .nav-link{border:none;background:none;font-weight:700;font-size:16px;padding:0}.app-nav{display:flex;gap:4px}.app-nav button{min-height:32px;padding:0 10px;font-size:14px}.app-content{flex:1;overflow-y:auto;padding:0}.auth-page,.onboarding,.settings-page,.progress-page,.parent-page{max-width:560px;margin:0 auto;display:flex;flex-direction:column;gap:16px}.chat-new{max-width:560px;margin:0 auto;display:flex;flex-direction:column;gap:20px}.back-link{align-self:flex-start;display:inline-flex;align-items:center;gap:4px;min-height:44px;color:var(--primary);text-decoration:none;font-weight:600}.chat-new-hero h1{margin:0 0 4px;font-size:24px}.chat-new-hero .notice{margin:0}.chat-new-step{display:flex;flex-direction:column;gap:12px}.chat-new-step h2{margin:0;font-size:16px;color:var(--muted);font-weight:600}.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}.subject-btn{display:flex;flex-direction:column;align-items:center;gap:6px;min-height:72px;padding:12px 10px;background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);color:var(--text);font-weight:600;cursor:pointer;transition:border-color .15s,background .15s}.subject-btn .subject-emoji{font-size:24px;line-height:1}.subject-btn:hover{border-color:var(--subject-color, var(--primary))}.subject-btn.selected{border-color:var(--subject-color, var(--primary));background:color-mix(in srgb,var(--subject-color, var(--primary)) 10%,#fff)}.subject-btn.custom.selected{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 10%,#fff)}.custom-subject-field{margin-top:4px}.chat-new-cta{width:100%;min-height:48px;font-size:17px}.alert{color:var(--danger);background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius);padding:12px 14px;margin:0}.notice{color:var(--muted)}.toggle{flex-direction:row;align-items:center;gap:10px}.toggle input{width:auto;min-height:auto}.chat-list{max-width:560px;margin:0 auto}.chat-list-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:16px}.chat-list-header h1{margin:0 0 2px;font-size:24px}.chat-list-subtitle{margin:0;font-size:15px}.chat-list-create{text-decoration:none;display:inline-flex;align-items:center;gap:4px;white-space:nowrap}.chat-empty{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius);padding:32px 20px}.chat-empty-emoji{font-size:36px;line-height:1}.chat-empty h2{margin:0;font-size:18px}.chat-empty p{margin:0 0 8px;color:var(--muted)}.chat-empty .cta{text-decoration:none;display:inline-flex;align-items:center}.chat-items{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.chat-card{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--surface);border:1px solid var(--border);border-left:4px solid var(--subject-color, var(--primary));border-radius:var(--radius);text-decoration:none;color:var(--text);min-height:44px}.chat-card-icon{font-size:22px;line-height:1;flex-shrink:0}.chat-card-body{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}.chat-card-body strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-card-subject{color:var(--muted);font-size:14px}.chat-card-open{color:var(--muted);font-size:20px;flex-shrink:0}.chat-detail{display:flex;flex-direction:column;height:100%;max-width:720px;margin:0 auto}.chat-detail-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 0}.chat-detail-titles h1{margin:0;font-size:20px}.chat-subject{color:var(--muted);font-size:14px}.mode-toggle{display:flex;align-items:center;gap:8px}.chat-header-menu{position:relative;display:none}.chat-menu-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;border:none;background:transparent;color:var(--muted);font-size:18px;cursor:pointer}.chat-menu-btn:hover{background:var(--surface-soft)}.chat-menu-popover{position:absolute;top:calc(100% + 6px);right:0;z-index:50;min-width:180px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 24px #00000026;padding:4px}.chat-menu-popover button{display:block;width:100%;text-align:left;min-height:40px;padding:0 12px;background:none;border:none;border-radius:calc(var(--radius) - 4px);font-size:14px;cursor:pointer}.chat-menu-popover button:hover{background:var(--surface-soft)}@media(max-width:760px){.app-shell:has(.chat-workspace) .app-header{display:none}.mode-toggle{display:none}.chat-header-menu{display:block}.chat-workspace .chat-brand-mobile{display:inline-flex;align-items:center;font-weight:700;font-size:15px;color:var(--text);text-decoration:none;padding:0 4px;min-height:36px}.chat-workspace .chat-detail-titles{flex:1;text-align:center;min-width:0}.chat-workspace .chat-detail-titles h1{font-size:16px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-workspace .chat-detail-titles .chat-subject{display:none}.chat-workspace .chat-mobile-back{display:none!important}.chat-workspace .chat-detail-header{padding:4px 8px}.chat-workspace .feedback{width:100%}}.mode-indicator{font-size:14px;font-weight:600;padding:4px 10px;border-radius:999px;color:#fff}.mode-indicator.solo{background:var(--solo)}.mode-indicator.assisted{background:var(--assisted)}.mode-btn{min-height:40px;font-size:14px}.chat-messages{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:10px;padding:8px 0}.empty{color:var(--muted);text-align:center;margin:24px 0}.message{display:flex;flex-direction:column;gap:6px}.message.user{align-items:flex-end}.message.assistant{align-items:flex-start}.bubble{max-width:85%;padding:10px 14px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);white-space:pre-wrap;word-break:break-word}.message.user .bubble{background:var(--primary);color:var(--primary-ink);border-color:var(--primary)}.message.streaming .bubble{border-style:dashed}.stream-error{align-self:center;text-align:center;color:var(--danger);background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius);padding:10px 14px}.rated{color:var(--solo);font-size:14px}.feedback{display:flex;flex-wrap:wrap;gap:6px}.feedback-btn{min-height:40px;font-size:14px;padding:0 10px}.feedback-mobile{display:none}@media(max-width:760px){.feedback-desktop{display:none}.feedback-mobile{display:block;position:relative;margin-left:auto}.feedback-more-btn{min-width:44px;min-height:40px;font-size:18px;padding:0 12px;border-radius:999px;background:var(--surface);border:1px solid var(--border);color:var(--text);box-shadow:0 1px 3px #0000001a}.feedback-more-btn:hover{background:var(--surface-soft)}.feedback-popover{position:absolute;bottom:calc(100% + 6px);right:0;z-index:50;display:flex;flex-wrap:wrap;justify-content:flex-end;gap:6px;min-width:200px;max-width:260px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 24px #00000026;padding:8px}}.quick-actions{display:flex;flex-wrap:wrap;gap:6px;padding-bottom:8px}.quick-action{min-height:40px;font-size:14px;padding:0 10px}.composer{padding:8px 0 calc(8px + var(--safe-bottom));background:var(--bg);border-top:1px solid var(--border)}.composer-row{display:flex;gap:8px;align-items:flex-end}.composer-row input,.composer-row textarea{flex:1}.composer-input{resize:none;overflow-y:auto;max-height:156px;line-height:1.5;padding:10px 12px;min-height:44px;font-family:inherit;font-size:15px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text)}.composer-input:focus{outline:none;border-color:var(--primary)}.composer-send{align-self:flex-end;flex-shrink:0}.attachment-input{width:auto;min-height:44px;flex-shrink:0;padding:0 8px}.attachment-list{display:flex;flex-direction:column;gap:6px;padding-bottom:8px}.attachment-item{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:6px 10px;font-size:14px}.attachment-item.error{border-color:var(--danger);background:#fef2f2}.attachment-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.attachment-status{color:var(--muted)}.attachment-status.error{color:var(--danger)}.attachment-remove{min-height:32px;min-width:32px;padding:0 8px;font-size:14px}.visual{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px;margin-top:8px}.visual h4{margin:0 0 8px}.visual ol,.visual ul{margin:0;padding-left:20px}.visual table{width:100%;border-collapse:collapse}.visual th,.visual td{border:1px solid var(--border);padding:6px 8px;text-align:left;font-size:14px}.mastery-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.mastery-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px}.score-row{display:flex;justify-content:space-between;font-size:15px;padding:2px 0}.score-label{color:var(--muted)}.score-value{font-weight:600}.parent-blocked{color:var(--danger);background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius);padding:12px 14px}.parent-report,.parent-privacy{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px}.settings-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;display:flex;flex-direction:column;gap:10px}.locale-toggle{display:flex;gap:8px}.locale-toggle button.active{background:var(--primary);color:var(--primary-ink);border-color:var(--primary)}.error-boundary{display:flex;flex-direction:column;align-items:center;gap:12px;padding:40px 16px;text-align:center}.load-older{align-self:center;min-height:40px;font-size:14px}.app-content:has(.chat-workspace){overflow:hidden;padding:0}.chat-workspace{display:flex;height:100%;background:var(--bg)}.conversation-sidebar{display:flex;flex-direction:column;width:320px;min-width:240px;border-right:1px solid var(--border);background:var(--surface);transition:width .2s ease,min-width .2s ease;overflow:hidden}.sidebar-settings{margin-top:auto;padding:12px 12px 16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:8px}.sidebar-settings-row{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:14px;color:var(--muted)}.sidebar-settings-row .mode-btn{min-height:32px;font-size:13px;padding:0 10px}.sidebar-settings-link{display:block;min-height:36px;line-height:36px;padding:0 10px;border-radius:var(--radius);font-size:14px;color:var(--text);text-decoration:none}.sidebar-settings-link:hover{background:var(--surface-soft)}.conversation-sidebar.collapsed{width:0;min-width:0;border-right:none}.conversation-sidebar.collapsed .conversation-sidebar-head>div:first-child,.conversation-sidebar.collapsed .conversation-list,.conversation-sidebar.collapsed .sidebar-new-chat{display:none}.sidebar-actions{display:flex;align-items:center;gap:4px}.sidebar-collapse-btn{width:36px;height:36px;border-radius:50%;border:none;background:transparent;color:var(--muted);font-size:18px;display:inline-flex;align-items:center;justify-content:center;min-width:36px;min-height:36px}.sidebar-collapse-btn:hover{background:var(--surface-soft);color:var(--text)}.conversation-sidebar-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}.conversation-sidebar-head strong{font-size:17px}.conversation-sidebar-head>div{display:flex;align-items:center;gap:8px}.conversation-sidebar-head>div>span{font-size:12px;color:var(--muted);background:var(--surface-soft);border-radius:999px;padding:2px 8px}.sidebar-new-chat{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;color:var(--primary);font-size:20px;text-decoration:none;background:var(--surface-soft)}.sidebar-new-chat:hover{background:var(--sidebar-active)}.conversation-list{flex:1;overflow-y:auto;padding:8px;display:flex;flex-direction:column;gap:4px}.conversation-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:10px;text-decoration:none;color:var(--text)}.conversation-item:hover{background:var(--surface-soft)}.conversation-item.active{background:var(--sidebar-active)}.conversation-avatar{width:42px;height:42px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:var(--primary);color:#fff;font-weight:700}.conversation-copy{display:flex;flex-direction:column;min-width:0;gap:1px}.conversation-copy strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:15px}.conversation-copy small{color:var(--muted);font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-workspace .chat-detail{flex:1;max-width:760px;margin:0 auto;height:100%;min-width:0;background:var(--chat-bg)}.chat-workspace .chat-detail-header{padding:6px 16px;background:var(--surface);border-bottom:1px solid var(--border)}.chat-workspace .chat-detail-titles h1{font-size:17px}.chat-brand-mobile{display:none}.chat-mobile-back{display:none;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;color:var(--text);background:var(--surface-soft);text-decoration:none;font-size:22px}.sidebar-toggle-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;border:none;background:transparent;color:var(--muted);font-size:18px;cursor:pointer;flex-shrink:0}.sidebar-toggle-btn:hover{background:var(--surface-soft);color:var(--text)}@media(max-width:760px){.sidebar-toggle-btn{display:none}}.chat-workspace .chat-messages{padding:16px 20px}.chat-workspace .bubble{max-width:82%;border-radius:16px;background:var(--bubble-assistant);border:none;color:var(--text)}.chat-workspace .message.user .bubble{background:var(--bubble-user);color:#fff}.chat-workspace .message.streaming .bubble{border:1px dashed var(--primary);background:var(--bubble-assistant)}.chat-workspace .composer{background:var(--surface);border-top:1px solid var(--border)}.chat-workspace .composer-row{gap:6px;padding:0 12px}.chat-workspace .composer-row input:not([type=file]){border-radius:20px;background:var(--surface-soft);border:none;min-height:42px}.composer-icon-button{width:44px;height:44px;border-radius:50%;border:none;flex-shrink:0;background:transparent;color:var(--muted);display:inline-flex;align-items:center;justify-content:center}.composer-icon-button:hover{background:var(--surface-soft);color:var(--text)}.composer-icon-button svg{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}.composer-send{width:44px;height:44px;border-radius:50%;border:none;flex-shrink:0;background:var(--primary);color:#fff;font-size:18px;display:inline-flex;align-items:center;justify-content:center}.composer-send:disabled{opacity:.4}.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.theme-button{background:transparent;border:none;color:var(--muted);font-size:18px}.theme-toggle{display:flex;gap:8px}.theme-toggle button.active{background:var(--primary);color:var(--primary-ink);border-color:var(--primary)}@media(max-width:860px){.conversation-sidebar{display:none}.chat-workspace .chat-messages{padding:12px}.chat-workspace .bubble{max-width:88%}}.markdown-body{font-size:15px;line-height:1.55}.mermaid-diagram{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:16px;margin:8px 0;overflow-x:auto;text-align:center;width:100%;max-width:min(100%,640px)}.mermaid-diagram svg{width:100%!important;max-width:100%!important;height:auto!important;font-size:16px}.mermaid-diagram .nodeLabel,.mermaid-diagram .edgeLabel,.mermaid-diagram foreignObject{font-size:15px!important;line-height:1.4!important;word-break:break-word;white-space:normal!important}.mermaid-diagram foreignObject div{white-space:normal!important;word-break:break-word!important}.message .bubble:has(.mermaid-diagram),.message .bubble:has(.inline-diagram){max-width:min(100%,680px)!important;width:100%!important}.inline-diagram{margin:8px 0;text-align:center;overflow-x:auto;width:100%}.inline-diagram svg{width:100%;max-width:100%;height:auto}:root[data-theme=dark] .mermaid-diagram{background:var(--surface-soft)}.markdown-body p{margin:0 0 8px}.markdown-body p:last-child{margin-bottom:0}.markdown-body ul,.markdown-body ol{margin:4px 0 8px;padding-left:20px}.markdown-body li{margin:2px 0}.markdown-body code{background:var(--surface-soft);padding:2px 6px;border-radius:4px;font-size:14px;font-family:SF Mono,Fira Code,monospace}.markdown-body pre{background:var(--surface-soft);padding:10px 12px;border-radius:8px;overflow-x:auto;margin:8px 0}.markdown-body pre code{background:none;padding:0}.markdown-body strong{font-weight:700}.markdown-body em{font-style:italic}.markdown-body h1,.markdown-body h2,.markdown-body h3{margin:12px 0 6px;font-size:17px}.markdown-body table{width:100%;border-collapse:collapse;margin:8px 0}.markdown-body th,.markdown-body td{border:1px solid var(--border);padding:6px 10px;text-align:left;font-size:14px}.markdown-body .katex{font-size:1.05em}.typing-indicator{display:inline-flex;gap:4px;align-items:center;padding:14px 18px!important}.typing-indicator span{width:8px;height:8px;border-radius:50%;background:var(--muted);animation:typing-bounce 1.2s infinite ease-in-out}.typing-indicator span:nth-child(2){animation-delay:.15s}.typing-indicator span:nth-child(3){animation-delay:.3s}@keyframes typing-bounce{0%,60%,to{transform:translateY(0);opacity:.4}30%{transform:translateY(-6px);opacity:1}}.markdown-body .katex-display{margin:8px 0;overflow-x:auto;overflow-y:hidden}