@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:"0.16.47"}.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{--bg: #fcfbf9;--surface-1: #ffffff;--surface-2: #ffffff;--surface-3: #f6f4f1;--surface-4: #eeece7;--line: #e6e3dd;--line-soft: #f2f0ec;--line-strong: #d4d0c8;--ink: #161513;--ink-2: #56524b;--ink-3: #756f65;--ink-4: #a4a096;--brand: #5b4ce0;--brand-hi: #6d5ff0;--brand-lo: #4a3cc9;--brand-tint: #f1efff;--brand-edge: #d7d1fb;--ok: #047857;--ok-tint: #ecfdf5;--ok-edge: #a7f3d0;--warn: #b45309;--warn-tint: #fffbeb;--warn-edge: #fde68a;--bad: #be123c;--bad-tint: #fff1f2;--bad-edge: #fecdd3;--s1: 4px;--s2: 8px;--s3: 12px;--s4: 16px;--s5: 20px;--s6: 24px;--s7: 32px;--s8: 48px;--s9: 64px;--r-xs: 4px;--r-sm: 6px;--r-md: 8px;--r-lg: 10px;--r-xl: 14px;--r-2xl: 18px;--r-full: 999px;--t-xs: 12px;--t-sm: 13px;--t-md: 14px;--t-base: 16px;--t-lg: 18px;--t-xl: 24px;--t-2xl: 32px;--t-3xl: 48px;--font: "Inter", -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Tamil", "Noto Sans Devanagari", "Noto Sans Arabic", sans-serif;--mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;--track-3xl: -.04em;--track-2xl: -.03em;--track-xl: -.022em;--track-lg: -.014em;--track-md: -.006em;--track-sm: 0;--track-xs: .02em;--w-light: 300;--w-normal: 400;--w-medium: 500;--w-strong: 600;--shadow-sm: none;--shadow-md: 0 1px 2px rgba(17, 24, 39, .04), 0 4px 12px rgba(17, 24, 39, .06);--shadow-lg: 0 2px 4px rgba(17, 24, 39, .04), 0 12px 32px rgba(17, 24, 39, .1);--ring: 0 0 0 3px var(--brand-tint);--spring: cubic-bezier(.32, .72, 0, 1);--spring-soft: cubic-bezier(.4, .6, .2, 1);--spring-snap: cubic-bezier(.16, 1, .3, 1);--dur-fast: .12s;--dur: .18s;--dur-slow: .3s;--ease: var(--spring);--measure: 35.5rem;--hairline: 1px;--material: saturate(120%) blur(12px);--material-thin: saturate(110%) blur(8px);--bg-raised: var(--surface-1);--bg-panel: var(--surface-2);--bg-input: var(--surface-3);--ink-dim: var(--ink-2);--ink-faint: var(--ink-3);--accent: var(--brand);--accent-soft: var(--brand-tint);--good: var(--ok);--radius: var(--r-lg);--radius-sm: var(--r-md);--shadow: var(--shadow-lg)}:root[data-theme=dark]{--bg: #0b0a09;--surface-1: #121110;--surface-2: #171614;--surface-3: #1f1e1b;--surface-4: #292722;--line: #2d2b27;--line-soft: #1e1c1a;--line-strong: #3e3b35;--ink: #f5f4f3;--ink-2: #a6a299;--ink-3: #918c81;--ink-4: #68645b;--brand: #8b7dff;--brand-hi: #a396ff;--brand-lo: #6d5ff0;--brand-tint: #1b1836;--brand-edge: #35306b;--ok: #34d399;--ok-tint: #0c2a20;--ok-edge: #1d5c46;--warn: #fbbf24;--warn-tint: #2b2109;--warn-edge: #5c4715;--bad: #fb7185;--bad-tint: #2e1116;--bad-edge: #6b2733;--shadow-md: 0 1px 2px rgba(0,0,0,.4), 0 4px 12px rgba(0,0,0,.4);--shadow-lg: 0 2px 4px rgba(0,0,0,.4), 0 12px 32px rgba(0,0,0,.55)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}@supports (height: 100dvh){html,body,#root{height:100dvh}}:root{--safe-t: env(safe-area-inset-top, 0px);--safe-b: env(safe-area-inset-bottom, 0px);--safe-l: env(safe-area-inset-left, 0px);--safe-r: env(safe-area-inset-right, 0px);--bottom-nav-h: 0px}body{background:var(--bg);color:var(--ink);font-family:var(--font);font-size:var(--t-base);line-height:1.5;font-weight:var(--w-normal);letter-spacing:var(--track-md);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-variant-numeric:tabular-nums;font-feature-settings:"cv05" 1,"ss03" 1}h1{font-size:var(--t-3xl);letter-spacing:var(--track-3xl);line-height:1.14;font-weight:var(--w-light)}h2{font-size:var(--t-2xl);letter-spacing:var(--track-2xl);line-height:1.2;font-weight:var(--w-light)}h3{font-size:var(--t-xl);letter-spacing:var(--track-xl);line-height:1.3;font-weight:var(--w-normal)}h4{font-size:var(--t-lg);letter-spacing:var(--track-lg);line-height:1.4;font-weight:var(--w-medium)}h1,h2,h3,h4{margin:0;color:var(--ink)}.md p,.md li{letter-spacing:var(--track-md);line-height:1.7}.label,.stage-step,.history-label{letter-spacing:var(--track-xs)}.icon{flex:none;display:block}button,a{display:inline-flex;align-items:center;gap:var(--s2)}button{border:none;background:none;color:inherit;letter-spacing:var(--track-md)}button:active:not(:disabled){transform:scale(.97)}button{transition:transform var(--dur-fast) var(--spring-snap)}:focus-visible{outline:none;box-shadow:0 0 0 3.5px color-mix(in srgb,var(--brand) 45%,transparent);border-radius:var(--r-sm)}::selection{background:var(--brand-edge);color:#fff}button{font-family:inherit;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}::-webkit-scrollbar{width:11px;height:11px}::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:var(--r-full);border:3px solid transparent;background-clip:content-box}::-webkit-scrollbar-thumb:hover{background:var(--ink-4);background-clip:content-box}::-webkit-scrollbar-track{background:transparent}*{scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--s2);height:36px;padding:0 var(--s5);border-radius:var(--r-sm);font-size:var(--t-md);font-weight:var(--w-normal);line-height:1;border:var(--hairline) solid transparent;white-space:nowrap;transition:background .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease),transform .1s var(--ease)}.btn:active:not(:disabled){transform:translateY(.5px)}.btn-primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}.btn-primary:hover:not(:disabled){background:#000;border-color:#000}:root[data-theme=dark] .btn-primary{background:var(--ink);color:#0a0a0b}.btn-secondary{background:var(--surface-1);color:var(--ink);border-color:var(--line)}.btn-secondary:hover:not(:disabled){background:var(--surface-3);border-color:var(--line-strong)}.btn-ghost{background:transparent;color:var(--ink-2)}.btn-ghost:hover:not(:disabled){background:var(--surface-3);color:var(--ink)}.btn-quiet{background:transparent;color:var(--ink-3);border-color:var(--line)}.btn-quiet:hover:not(:disabled){color:var(--ink);border-color:var(--brand-edge)}.btn-danger{background:var(--bad-tint);color:var(--bad);border-color:var(--bad-edge)}.btn-icon{width:38px;padding:0;border-radius:var(--r-md)}.btn-round{border-radius:var(--r-full)}.btn-sm{height:32px;padding:0 var(--s3);font-size:var(--t-sm)}.btn-sm.btn-icon{width:32px;padding:0}.btn-lg{height:46px;padding:0 var(--s5);font-size:var(--t-lg)}.btn.is-active{background:var(--brand-tint);color:var(--brand);border-color:var(--brand-edge)}.field{height:36px;width:100%;padding:0 var(--s3);background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-sm);color:var(--ink);font:inherit;font-size:var(--t-md);transition:border-color .16s var(--ease),box-shadow .16s var(--ease)}.field::placeholder{color:var(--ink-4)}.field:focus{outline:none;border-color:var(--brand);box-shadow:var(--ring)}.card{background:var(--surface-2);border:var(--hairline) solid var(--line);border-radius:var(--r-md)}.label{font-size:var(--t-md);font-weight:var(--w-normal);letter-spacing:var(--track-sm);color:var(--ink-3)}.boot{height:100%;display:grid;place-content:center;justify-items:center;gap:20px;color:var(--ink-dim)}.boot-orb{width:62px;height:62px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#4ecdc4);animation:breathe 1.7s ease-in-out infinite}@keyframes breathe{0%,to{transform:scale(.86);opacity:.7}50%{transform:scale(1.06);opacity:1}}.gate{min-height:100%;display:grid;grid-template-columns:1.15fr .85fr;align-items:center;gap:40px;padding:40px clamp(20px,6vw,80px)}.gate-hero h1{font-size:clamp(34px,5vw,54px);margin:12px 0 6px;letter-spacing:-.02em}.gate-hero>p{color:var(--ink-dim);font-size:18px;margin:0 0 26px}.gate-badge{width:58px;height:58px;display:grid;place-content:center;font-size:28px;border-radius:18px;background:var(--bg-panel);border:1px solid var(--line)}.gate-features{list-style:none;padding:0;margin:0;display:grid;gap:12px;max-width:460px}.gate-features li{background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius-sm);padding:12px 16px;color:var(--ink-dim)}.gate-form{display:grid;gap:16px;justify-items:stretch;max-width:400px;width:100%}.auth{display:grid;gap:12px;background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.auth-tabs{display:flex;gap:8px;margin-bottom:4px}.auth-tabs button{flex:1;padding:10px;border-radius:var(--radius-sm);border:1px solid transparent;background:transparent;color:var(--ink-dim);font-weight:600}.auth-tabs button.is-active{background:var(--accent-soft);color:var(--ink);border-color:var(--accent)}.auth input,.quiz-form input,.knowledge-search input{background:var(--bg-input);border:1px solid var(--line);color:var(--ink);border-radius:var(--radius-sm);padding:12px 14px;font-size:15px;width:100%}.auth input:focus,.quiz-form input:focus,.knowledge-search input:focus,.composer-input:focus,.quiz-text:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.auth-demo{color:var(--ink-faint);font-size:12.5px;margin:2px 0 0;text-align:center}.auth-demo code{background:var(--bg-input);padding:1px 6px;border-radius:5px;font-family:var(--mono)}button.primary{background:linear-gradient(135deg,var(--accent),#5471e8);color:#fff;border:none;border-radius:var(--radius-sm);padding:12px 18px;font-weight:650}button.primary:hover:not(:disabled){filter:brightness(1.08)}button.link{background:none;border:none;color:var(--accent);font-size:14px;padding:4px}.app{height:100%;display:grid;grid-template-columns:264px 1fr}.sidebar{background:var(--surface-1);border-inline-end:var(--hairline) solid var(--line);display:flex;flex-direction:column;padding:var(--s4) var(--s3);gap:var(--s4);min-height:0}.sidebar-head{display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:var(--s3);font-weight:640;letter-spacing:-.02em;font-size:var(--t-base)}.brand-badge{width:30px;height:30px;display:grid;place-content:center;border-radius:var(--r-sm);color:#fff;background:linear-gradient(140deg,var(--brand-hi),var(--brand-lo));box-shadow:var(--shadow-sm)}.sidebar-close{display:none;background:none;border:none;color:var(--ink-dim);font-size:18px}.new-session{display:inline-flex;align-items:center;justify-content:center;gap:var(--s2);height:38px;background:var(--surface-2);border:1px solid var(--line);color:var(--ink);border-radius:var(--r-md);font-weight:550;font-size:var(--t-md);transition:border-color .16s var(--ease),background .16s var(--ease)}.new-session:hover{border-color:var(--brand-edge);background:var(--surface-3)}.history{flex:1;overflow-y:auto;display:grid;gap:4px;align-content:start;min-height:0}.history-label{color:var(--ink-faint);font-size:11.5px;text-transform:uppercase;letter-spacing:.09em;padding:6px 8px}.history-row{display:grid;gap:1px;text-align:start;background:none;border:none;padding:9px 10px;border-radius:var(--radius-sm);color:var(--ink-dim)}.history-row:hover{background:var(--bg-panel);color:var(--ink)}.history-row.is-active{background:var(--accent-soft);color:var(--ink)}.history-title{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-sub{font-size:11.5px;color:var(--ink-faint)}.sidebar-foot{border-top:var(--hairline) solid var(--line);padding-top:var(--s3);display:grid;gap:4px}.who{font-size:13px;color:var(--ink-dim)}.main{display:flex;flex-direction:column;min-width:0;min-height:0}.topbar{display:flex;align-items:center;gap:var(--s3);padding:var(--s3) var(--s5);min-height:62px;border-bottom:1px solid var(--line-soft);background:color-mix(in srgb,var(--surface-1) 72%,transparent);backdrop-filter:var(--material);-webkit-backdrop-filter:var(--material);border-bottom:var(--hairline) solid var(--line);position:sticky;top:0;z-index:20}.hamburger{display:none;background:none;border:none;color:var(--ink);font-size:20px}.tabs{display:flex;gap:2px;background:var(--surface-1);padding:4px;border-radius:var(--r-md);border:1px solid var(--line-soft)}.tabs button{display:inline-flex;align-items:center;gap:var(--s2);color:var(--ink-3);padding:0 var(--s3);height:32px;border-radius:var(--r-sm);font-weight:550;font-size:var(--t-md);transition:background .16s var(--ease),color .16s var(--ease)}.tabs button:hover{color:var(--ink)}.tabs button.is-active{background:var(--surface-3);color:var(--ink);box-shadow:var(--shadow-sm)}.topbar-right{margin-inline-start:auto;display:flex;align-items:center;gap:10px}.health-pill{background:var(--warn-tint);border:1px solid var(--warn-edge);color:var(--warn);padding:5px 10px;border-radius:999px;font-size:12px}.live-toggle{background:var(--bg-panel);border:1px solid var(--line);color:var(--ink);padding:9px 15px;border-radius:999px;font-weight:650;font-size:13.5px}.live-toggle:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.thread{flex:1;overflow-y:auto;padding:26px clamp(14px,4vw,44px) 8px;display:flex;flex-direction:column;gap:22px;overscroll-behavior:contain}.thread>*{max-width:720px;width:100%;margin:0 auto}.empty{text-align:center;padding:8vh 0 0}.empty h2{font-size:27px;margin:0 0 22px;letter-spacing:-.015em}.suggestions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.suggestions button{background:var(--surface-2);border:1px solid var(--line);color:var(--ink-2);padding:0 var(--s4);height:38px;border-radius:var(--r-full);font-size:var(--t-md);transition:border-color .16s var(--ease),color .16s var(--ease),background .16s var(--ease)}.suggestions button:hover{border-color:var(--brand-edge);color:var(--ink);background:var(--surface-3)}.empty-hint{color:var(--ink-faint);margin-top:24px;font-size:14px}.msg{display:flex;gap:13px}.msg-user{justify-content:flex-end}.msg-user .msg-bubble{background:linear-gradient(150deg,var(--brand-lo),#35459c);border:1px solid rgba(255,255,255,.09);border-radius:var(--r-lg) var(--r-lg) var(--s1) var(--r-lg);padding:var(--s3) var(--s4);max-width:76%;box-shadow:var(--shadow-sm)}.msg-tutor{align-items:flex-start}.msg-avatar{flex:none;width:34px;height:34px;border-radius:var(--r-sm);display:grid;place-content:center;color:var(--brand);background:var(--surface-2);border:1px solid var(--line)}.msg-body{flex:1;min-width:0;display:grid;gap:12px}.msg-tutor .msg-bubble{background:var(--surface-2);border:1px solid var(--line-soft);border-radius:var(--s1) var(--r-lg) var(--r-lg) var(--r-lg);padding:var(--s4) var(--s5);box-shadow:var(--shadow-sm)}.msg-image{max-width:260px;border-radius:10px;margin-bottom:8px;display:block}.msg-warning{background:var(--bad-tint);border:1px solid var(--bad-edge);color:var(--bad);padding:9px 13px;border-radius:var(--radius-sm);font-size:13.5px}.caret{display:inline-block;width:8px;height:17px;background:var(--accent);margin-inline-start:3px;vertical-align:text-bottom;animation:blink 1s steps(2) infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.msg-actions{display:flex;flex-wrap:wrap;gap:7px}.msg-actions button{background:var(--bg-raised);border:1px solid var(--line-soft);color:var(--ink-dim);padding:6px 12px;border-radius:999px;font-size:12.5px}.msg-actions button:hover,.msg-actions button.is-active{border-color:var(--accent);color:var(--accent)}.follow-ups{display:flex;flex-wrap:wrap;gap:7px;align-items:center}.follow-ups-label{color:var(--ink-faint);font-size:12px;text-transform:uppercase;letter-spacing:.07em}.follow-ups button{background:transparent;border:1px solid var(--line);color:var(--ink-dim);padding:7px 13px;border-radius:999px;font-size:13px;text-align:start}.follow-ups button:hover{border-color:var(--accent);color:var(--ink)}.msg-meta{display:flex;gap:6px;flex-wrap:wrap}.tag{background:var(--bg-raised);border:1px solid var(--line-soft);color:var(--ink-faint);font-size:11px;padding:2px 8px;border-radius:6px;font-family:var(--mono)}.tag-cache{color:var(--good);border-color:#7ddf644d}.thinking{display:flex;gap:5px;align-items:center;color:var(--ink-faint);font-size:13.5px}.thinking span{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:bounce 1.3s infinite}.thinking span:nth-child(2){animation-delay:.16s}.thinking span:nth-child(3){animation-delay:.32s;margin-inline-end:6px}@keyframes bounce{0%,60%,to{transform:translateY(0);opacity:.45}30%{transform:translateY(-6px);opacity:1}}.md>*:first-child{margin-top:0}.md>*:last-child{margin-bottom:0}.md p,.md li,.md blockquote,.md h1,.md h2,.md h3,.md h4,.md ul,.md ol,.md hr,.sources,.key-points,.msg-actions,.msg-meta{max-width:var(--measure)}.md-code,.md-table-wrap,.katex-display,.media-strip,.bs-array,.mermaid-viz,.chart-viz{max-width:none}.md h1,.md h2,.md h3,.md h4{margin:34px 0 10px;line-height:1.25;font-weight:var(--w-strong);letter-spacing:-.018em;color:var(--ink);text-wrap:balance}.md h1{font-size:27px;letter-spacing:-.026em}.md h2{font-size:22px}.md h3{font-size:18px;letter-spacing:-.012em}.md h4{font-size:15px;letter-spacing:0;color:var(--ink-2)}.md>:is(h1,h2,h3,h4):first-child{margin-top:0}.md p{margin:0 0 15px}.md ul,.md ol{margin:0 0 15px;padding-inline-start:22px}.md li{margin-bottom:7px}.md li>ul,.md li>ol{margin:7px 0 0}.md strong{color:var(--ink);font-weight:600}.md blockquote{border-inline-start:3px solid var(--accent);margin:12px 0;padding:2px 0 2px 14px;color:var(--ink-dim)}.md code{background:var(--bg-input);padding:1.5px 6px;border-radius:5px;font-family:var(--mono);font-size:.9em;color:#a8c7ff}.md-code{background:var(--surface-1);border:1px solid var(--line);border-radius:var(--r-md);padding:var(--s4);overflow-x:auto;font-family:var(--mono);font-size:13px;margin:0 0 12px;line-height:1.55}.md-code code{background:none;padding:0;border-radius:0;font-size:inherit;color:var(--ink)}.md-table-wrap{overflow-x:auto;margin:0 0 12px}.md table{border-collapse:collapse;width:100%;font-size:14px}.md th,.md td{border:1px solid var(--line);padding:8px 12px;text-align:start}.md th{background:var(--bg-input);font-weight:650}.katex{font-size:1.03em}.katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}.sources{border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--line-soft)}.sources-banner{width:100%;display:flex;align-items:center;gap:9px;background:var(--bg-raised);border:none;color:var(--ink-dim);padding:9px 13px;font-size:13px;text-align:start}.sources-dot{width:8px;height:8px;border-radius:50%;flex:none}.sources-grounded .sources-dot{background:var(--good);box-shadow:0 0 8px #7ddf6499}.sources-general .sources-dot{background:var(--warn)}.sources-failed .sources-dot{background:var(--bad)}.sources-grounded{border-color:var(--ok-edge)}.sources-general{border-color:var(--warn-edge)}.sources-failed{border-color:var(--bad-edge)}.sources-label{flex:1}.sources-chevron{color:var(--ink-faint)}.sources-list{margin:0;padding:4px 13px 11px;list-style:none;display:grid;gap:6px}.sources-list li{display:flex;gap:9px;font-size:13px;color:var(--ink-dim);align-items:baseline}.sources-n{color:var(--accent);font-family:var(--mono);font-size:12px}.sources-title{flex:1}.sources-score{color:var(--ink-faint);font-family:var(--mono);font-size:11.5px}.viz{margin:0;background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:15px 17px}.viz-title{font-weight:650;font-size:14px;margin-bottom:11px;color:var(--ink)}.viz-caption{color:var(--ink-faint);font-size:12.5px;margin:10px 0 0}.mermaid-surface{overflow-x:auto;overflow-y:hidden;text-align:center;cursor:zoom-in;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain}.md-code,.md-table-wrap,.katex-display,.media-strip,.bs-array{-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain}.md p,.md li,.md h1,.md h2,.md h3,.md h4,.msg-bubble,.toc-title,.picker-title,.history-title{overflow-wrap:anywhere}.mermaid-surface svg{max-width:100%;height:auto}.mermaid-viz.is-zoomed .mermaid-surface{cursor:zoom-out}.mermaid-viz.is-zoomed .mermaid-surface svg{max-width:none;width:165%}.viz-fallback{color:var(--ink-dim);font-size:13px}.viz-fallback pre{background:var(--surface-1);padding:var(--s3);border-radius:var(--r-sm);overflow-x:auto;font-family:var(--mono);font-size:12px}.chart-surface{height:300px;width:100%}.key-points{background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:14px 18px}.key-points ul{margin:0;padding-inline-start:20px}.key-points li{margin-bottom:5px;color:var(--ink-dim)}.media-heading{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin:0 0 10px;font-weight:650}.media-block{display:grid;gap:2px}.media-strip{display:flex;gap:11px;overflow-x:auto;padding-bottom:5px}.media-card{flex:none;width:208px;text-decoration:none;color:inherit;background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius-sm);overflow:hidden}.media-card:hover{border-color:var(--accent)}.media-thumb{position:relative;aspect-ratio:16 / 9;background:var(--surface-3);display:grid;place-content:center}.media-thumb img{width:100%;height:100%;object-fit:cover}.media-thumb-fallback{font-size:26px;color:var(--ink-faint)}.media-duration{position:absolute;inset-inline-end:6px;bottom:6px;background:#000000b8;color:#fff;font-size:11px;padding:1px 6px;border-radius:4px;font-family:var(--mono)}.media-meta{padding:9px 11px;display:grid;gap:3px}.media-title{font-size:13px;line-height:1.38;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.media-source{font-size:11px;color:var(--ink-faint)}.media-card-image .media-thumb{aspect-ratio:4 / 3}.composer{border-top:var(--hairline) solid var(--line);padding:var(--s3) clamp(var(--s4),4vw,var(--s9)) var(--s5);background:color-mix(in srgb,var(--surface-1) 74%,transparent);backdrop-filter:var(--material);-webkit-backdrop-filter:var(--material)}.composer>*{max-width:720px;margin:0 auto}.composer-attachment{position:relative;width:fit-content;margin-bottom:9px}.composer-attachment img{max-height:92px;border-radius:9px;display:block}.composer-attachment button{position:absolute;top:-7px;inset-inline-end:-7px;width:22px;height:22px;border-radius:50%;background:var(--bad);color:#171020;border:none;font-size:12px}.composer-interim{color:var(--accent);font-size:13.5px;padding:6px 14px;margin-bottom:7px;background:var(--accent-soft);border-radius:9px}.composer-row{display:flex;align-items:flex-end;gap:var(--s2);background:var(--surface-2);border:1px solid var(--line);border-radius:var(--r-xl);padding:var(--s2) var(--s2) var(--s2) var(--s3);transition:border-color .16s var(--ease),box-shadow .16s var(--ease)}.composer-row:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.composer-input{flex:1;background:none;border:none;color:var(--ink);resize:none;font-size:max(16px,var(--t-base));line-height:1.5;padding:var(--s2) 2px;max-height:190px;font-family:inherit}.composer-input::placeholder{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.composer-input:focus{outline:none;box-shadow:none}.composer-icon{flex:none;width:38px;height:38px;border-radius:var(--r-full);display:inline-flex;align-items:center;justify-content:center;color:var(--ink-3);transition:background .16s var(--ease),color .16s var(--ease)}.composer-icon:hover:not(:disabled){background:var(--bg-panel);color:var(--ink)}.composer-mic.is-live{background:var(--bad-tint);color:var(--bad);border-color:var(--bad-edge);animation:pulse 1.4s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 0 0 var(--bad-edge)}50%{box-shadow:0 0 0 9px transparent}}.composer-send{flex:none;width:40px;height:40px;border-radius:var(--r-full);display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(180deg,var(--brand-hi),var(--brand-lo));color:#fff;box-shadow:var(--shadow-sm)}.composer-send:hover:not(:disabled){filter:brightness(1.08)}.composer-send.is-stop{border-radius:999px;padding:0 16px;background:var(--bg-panel);border:1px solid var(--bad);color:var(--bad);font-size:13.5px}.app.is-live .main{background:radial-gradient(900px 600px at 50% 25%,rgba(108,140,255,.1),transparent 65%)}.live{flex:1;display:grid;place-items:center;padding:20px;min-height:0;overflow-y:auto}.live-inner{display:grid;justify-items:center;gap:26px;max-width:660px;width:100%}.orb{position:relative;background:none;border:none;padding:0;display:grid;justify-items:center}.orb canvas{display:block}.orb-label{position:absolute;bottom:-6px;left:50%;transform:translate(-50%);font-size:13.5px;color:var(--ink-dim);white-space:nowrap;letter-spacing:.02em}.orb-listening .orb-label{color:var(--good)}.orb-thinking .orb-label{color:var(--brand-hi)}.orb-speaking .orb-label{color:var(--accent)}.orb-error .orb-label{color:var(--bad)}.live-transcript{width:100%;max-height:34vh;overflow-y:auto;background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:17px 20px;display:grid;gap:10px}.live-interim{color:var(--accent);font-style:italic;margin:0}.live-line{margin:0;color:var(--ink-dim);font-size:14.5px}.live-line b,.live-user{color:var(--ink)}.live-hint{color:var(--ink-faint);margin:0;text-align:center}.live-actions{display:flex;flex-wrap:wrap;gap:9px;justify-content:center}.live-actions button{background:var(--bg-panel);border:1px solid var(--line);color:var(--ink-dim);padding:9px 16px;border-radius:999px;font-size:13.5px}.live-actions button:hover{border-color:var(--accent);color:var(--ink)}.panel-scroll{flex:1;overflow-y:auto;padding:24px clamp(14px,4vw,44px) 40px}.panel{max-width:880px;margin:0 auto;background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:22px 24px;display:grid;gap:14px}.panel-title{margin:0;font-size:17px;letter-spacing:-.01em}.panel-hint{color:var(--ink-faint);font-size:13.5px;margin:0}.panel-error{background:var(--bad-tint);border:1px solid var(--bad-edge);color:var(--bad);padding:10px 14px;border-radius:var(--radius-sm);font-size:13.5px}.thread-error{max-width:720px;margin:0 auto}.upload-zone{display:grid;justify-items:center;gap:5px;padding:26px;border-radius:var(--radius);border:1.5px dashed var(--line);background:var(--bg-raised);color:var(--ink-dim)}.upload-zone:hover:not(:disabled){border-color:var(--accent);color:var(--ink)}.upload-icon{font-size:24px}.upload-text{font-weight:650}.upload-hint{font-size:12px;color:var(--ink-faint)}.knowledge-search{display:flex;gap:8px}.knowledge-search button{background:var(--bg-input);border:1px solid var(--line);color:var(--ink);border-radius:var(--radius-sm);padding:0 16px}.knowledge-hits{display:grid;gap:8px}.hit{display:grid;grid-template-columns:1fr auto;gap:3px 10px;text-align:start;background:var(--bg-raised);border:1px solid var(--line-soft);border-radius:var(--radius-sm);padding:11px 14px;color:var(--ink-dim)}.hit:hover{border-color:var(--accent)}.hit-title{font-size:13px;color:var(--ink);font-weight:600}.hit-score{font-family:var(--mono);font-size:11.5px;color:var(--good)}.hit-text{grid-column:1 / -1;font-size:12.5px;color:var(--ink-faint)}.doc-list{display:grid;gap:7px}.doc-row{display:flex;align-items:center;gap:11px;background:var(--bg-raised);border:1px solid var(--line-soft);border-radius:var(--radius-sm);padding:10px 13px}.doc-failed{border-color:var(--bad-edge)}.doc-meta{flex:1;display:grid;gap:1px;min-width:0}.doc-title{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.doc-sub{font-size:11.5px;color:var(--ink-faint)}.doc-delete{background:none;border:none;color:var(--ink-faint);font-size:14px}.quiz-head{display:flex;align-items:center;justify-content:space-between}.quiz-progress{color:var(--ink-faint);font-family:var(--mono);font-size:12.5px}.quiz-grounded{font-size:12.5px;color:var(--good)}.quiz-form{display:flex;gap:8px}.quiz-question{font-size:16px}.quiz-options{display:grid;gap:8px}.quiz-option{text-align:start;background:var(--bg-raised);border:1px solid var(--line);color:var(--ink);padding:12px 16px;border-radius:var(--radius-sm);font-size:14.5px}.quiz-option:hover:not(:disabled){border-color:var(--accent)}.quiz-option.is-picked{border-color:var(--accent);background:var(--accent-soft)}.quiz-option.is-right{border-color:var(--good);background:#7ddf641f}.quiz-option.is-wrong{border-color:var(--bad);background:#ff8fab1f}.quiz-text{background:var(--bg-input);border:1px solid var(--line);color:var(--ink);border-radius:var(--radius-sm);padding:12px 14px;font-family:inherit;font-size:14.5px;resize:vertical}.quiz-feedback{border-radius:var(--radius-sm);padding:13px 16px;font-size:14px;display:grid;gap:7px}.quiz-feedback p{margin:0}.quiz-feedback.ok{background:var(--ok-tint);border:1px solid var(--ok-edge)}.quiz-feedback.partial{background:var(--warn-tint);border:1px solid var(--warn-edge)}.quiz-feedback.bad{background:var(--bad-tint);border:1px solid var(--bad-edge)}.quiz-feedback.warn{background:var(--warn-tint);border:1px solid var(--warn-edge)}.quiz-feedback-head{font-weight:650;display:flex;gap:9px;align-items:center}.quiz-feedback-score{margin-inline-start:auto;font-family:var(--mono);font-size:13px}.quiz-feedback-explain,.quiz-feedback-misconception,.quiz-feedback-next{color:var(--ink-dim);font-size:13.5px}.quiz-actions{display:flex;gap:9px;flex-wrap:wrap}.quiz-actions button:not(.primary){background:var(--bg-raised);border:1px solid var(--line);color:var(--ink-dim);padding:10px 16px;border-radius:var(--radius-sm)}.quiz-score{display:grid;justify-items:center;gap:4px;padding:22px;border-radius:var(--radius);background:var(--bg-raised);border:1px solid var(--line)}.quiz-score.ok{border-color:var(--ok-edge)}.quiz-score.partial{border-color:var(--warn-edge)}.quiz-score.bad{border-color:var(--bad-edge)}.quiz-score-value{font-size:42px;font-weight:700;letter-spacing:-.02em}.quiz-score-detail{color:var(--ink-dim);font-size:13.5px}.quiz-breakdown{list-style:none;margin:0;padding:0;display:grid;gap:9px}.quiz-breakdown li{background:var(--bg-raised);border:1px solid var(--line-soft);border-radius:var(--radius-sm);padding:12px 15px;display:grid;gap:5px}.quiz-breakdown li.ok{border-inline-start:3px solid var(--good)}.quiz-breakdown li.partial{border-inline-start:3px solid var(--warn)}.quiz-breakdown li.bad{border-inline-start:3px solid var(--bad)}.quiz-breakdown-q{font-size:14px}.quiz-breakdown-f,.quiz-breakdown-e{font-size:13px;color:var(--ink-dim)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:10px}.stat{display:grid;justify-items:center;gap:2px;padding:16px 10px;background:var(--bg-raised);border:1px solid var(--line-soft);border-radius:var(--radius-sm)}.stat-value{font-size:26px;font-weight:700;letter-spacing:-.02em}.stat-label{font-size:11.5px;color:var(--ink-faint);text-align:center}.progress-subject{display:grid;gap:6px}.progress-subject-head{display:flex;justify-content:space-between;font-size:12.5px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.07em}.progress-avg{color:var(--ink-dim);font-family:var(--mono)}.topic-row{display:grid;grid-template-columns:minmax(90px,1.3fr) 2fr auto;gap:12px;align-items:center;background:none;border:none;padding:7px 4px;border-radius:8px;color:var(--ink-dim);text-align:start}.topic-row:hover{background:var(--bg-raised);color:var(--ink)}.topic-name{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mastery-track{height:7px;background:var(--bg-input);border-radius:999px;overflow:hidden}.mastery-fill{height:100%;border-radius:999px;transition:width .5s ease}.mastery-fill.ok{background:var(--good)}.mastery-fill.partial{background:var(--warn)}.mastery-fill.bad{background:var(--bad)}.mastery-fill.new{background:var(--line)}.topic-status{font-family:var(--mono);font-size:11.5px;min-width:40px;text-align:end}.topic-status.ok{color:var(--good)}.topic-status.partial{color:var(--warn)}.topic-status.bad{color:var(--bad)}.recs{display:grid;gap:9px}.recs-narrative{color:var(--ink-dim);font-size:14px;margin:0 0 4px}.rec-card{display:grid;gap:3px;text-align:start;background:var(--bg-raised);border:1px solid var(--line-soft);border-radius:var(--radius-sm);padding:13px 16px}.rec-card:hover{border-color:var(--accent)}.rec-title{font-weight:650;color:var(--ink);font-size:14px}.rec-reason{font-size:12.5px;color:var(--ink-faint)}.sim-viz,.sim-body{display:grid;gap:12px}.sim-canvas{width:100%;height:260px;background:var(--surface-1);border:1px solid var(--line-soft);border-radius:var(--radius-sm);display:block}.sim-readout{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13px;color:var(--ink-dim);font-family:var(--mono)}.sim-readout b{color:var(--ink)}.sim-controls{display:grid;gap:11px}.sim-control{display:grid;gap:5px}.sim-control-label{display:flex;justify-content:space-between;font-size:12.5px;color:var(--ink-dim)}.sim-control-label b{color:var(--accent);font-family:var(--mono)}.sim-control input[type=range]{width:100%;accent-color:var(--accent)}.sim-choice{display:flex;gap:6px}.sim-choice button{flex:1;background:var(--bg-raised);border:1px solid var(--line);color:var(--ink-dim);padding:7px;border-radius:8px;font-size:12.5px}.sim-choice button.is-active{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.sim-buttons{display:flex;gap:8px;flex-wrap:wrap}.sim-buttons button{background:var(--bg-raised);border:1px solid var(--line);color:var(--ink-dim);padding:8px 14px;border-radius:8px;font-size:13px}.sim-buttons button.primary{color:#fff}.bs-array{display:flex;flex-wrap:wrap;gap:5px}.bs-cell{display:grid;justify-items:center;min-width:42px;padding:7px 5px;border-radius:8px;border:1px solid var(--line);background:var(--bg-raised);transition:all .25s ease}.bs-cell.discarded{opacity:.25}.bs-cell.is-mid{border-color:var(--warn);background:#ffd16624}.bs-cell.is-found{border-color:var(--good);background:#7ddf642e}.bs-value{font-family:var(--mono);font-size:13px}.bs-index{font-size:10px;color:var(--ink-faint)}.sort-bars{display:flex;align-items:flex-end;gap:3px;height:210px;padding:var(--s3);background:var(--surface-1);border:1px solid var(--line-soft);border-radius:var(--radius-sm)}.sort-bar{flex:1;background:linear-gradient(180deg,var(--accent),#3d55a8);border-radius:3px 3px 0 0}.sort-bar.is-active{background:linear-gradient(180deg,var(--warn),#c9922e)}.lang{position:relative}.lang-trigger{display:flex;align-items:center;gap:8px;background:var(--bg-panel);border:1px solid var(--line);color:var(--ink);padding:9px 14px;border-radius:999px;font-size:13.5px}.lang-trigger:hover{border-color:var(--accent)}.lang-compact .lang-trigger{padding:8px 12px;font-size:13px}.lang-caret{color:var(--ink-faint);font-size:10px}.lang-menu{position:absolute;top:calc(100% + 7px);inset-inline-end:0;z-index:60;background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--radius);padding:6px;margin:0;list-style:none;box-shadow:var(--shadow);max-height:340px;overflow-y:auto;min-width:208px}.lang-menu button{width:100%;display:flex;justify-content:space-between;gap:12px;align-items:baseline;background:none;border:none;color:var(--ink-dim);padding:8px 11px;border-radius:8px;text-align:start;font-size:13.5px}.lang-menu button:hover{background:var(--bg-raised);color:var(--ink)}.lang-menu button.is-active{background:var(--accent-soft);color:var(--ink)}.lang-menu-name{font-size:11.5px;color:var(--ink-faint)}.scrim,.bottom-nav{display:none}.classroom{flex:1;display:grid;grid-template-columns:290px 1fr;min-height:0}.classroom-picker{display:block;overflow-y:auto;padding:40px clamp(16px,5vw,56px)}.picker-inner{max-width:720px;margin:0 auto;display:grid;gap:14px}.picker-inner h2{margin:0;font-size:26px;letter-spacing:-.015em}.picker-list{display:grid;gap:10px;margin-top:8px}.picker-card{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;background:var(--bg-panel);border:1px solid var(--line);color:var(--ink);border-radius:var(--radius);padding:16px 18px;text-align:start}.picker-card:hover{border-color:var(--accent);transform:translateY(-1px)}.picker-icon{font-size:26px}.picker-meta{display:grid;gap:3px;min-width:0}.picker-title{font-weight:650;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.picker-sub{font-size:12.5px;color:var(--ink-faint)}.picker-go{color:var(--accent);font-size:15px}.picker-empty{display:grid;justify-items:center;gap:10px;padding:46px;border:1.5px dashed var(--line);border-radius:var(--radius);color:var(--ink-faint)}.picker-empty span{font-size:32px}.picker-empty p{margin:0;text-align:center;max-width:40ch}.room-rail{background:var(--bg-raised);border-inline-end:1px solid var(--line);display:flex;flex-direction:column;min-height:0}.rail-head{padding:14px 16px;border-bottom:var(--hairline) solid var(--line);display:grid;gap:var(--s2)}.rail-back{background:none;border:none;color:var(--accent);font-size:12.5px;padding:0;text-align:start}.rail-doc{font-weight:650;font-size:14px;line-height:1.35}.rail-progress{height:5px;background:var(--bg-input);border-radius:999px;overflow:hidden}.rail-progress-fill{height:100%;background:linear-gradient(90deg,var(--ok),var(--good));transition:width .45s ease}.rail-count{font-size:11.5px;color:var(--ink-faint);font-family:var(--mono)}.toc{list-style:none;margin:0;padding:8px;overflow-y:auto;display:grid;gap:3px;align-content:start;min-height:0}.toc-row{width:100%;display:grid;grid-template-columns:26px 1fr;gap:10px;align-items:start;text-align:start;background:none;border:none;padding:10px;border-radius:var(--radius-sm);color:var(--ink-dim)}.toc-row:hover{background:var(--bg-panel);color:var(--ink)}.toc-mark{width:24px;height:24px;border-radius:50%;display:grid;place-content:center;font-size:11.5px;border:1px solid var(--line);font-family:var(--mono)}.toc-row.is-done .toc-mark{background:#7ddf6429;border-color:var(--good);color:var(--good)}.toc-row.is-current{background:var(--accent-soft);color:var(--ink)}.toc-row.is-current .toc-mark{background:var(--accent);border-color:var(--accent);color:#fff}.toc-body{display:grid;gap:2px;min-width:0}.toc-title{font-size:13.5px;line-height:1.35}.toc-summary{font-size:11.5px;color:var(--ink-faint);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.room-stage{display:flex;flex-direction:column;min-width:0;min-height:0;background:radial-gradient(800px 460px at 50% 0%,rgba(108,140,255,.07),transparent 70%)}.stage-head{display:flex;align-items:flex-start;gap:14px;padding:16px clamp(16px,3vw,30px) 10px;border-bottom:var(--hairline) solid var(--line)}.stage-titles{flex:1;min-width:0}.stage-step{font-size:11.5px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.09em;font-family:var(--mono)}.stage-head h2{margin:3px 0 0;font-size:21px;letter-spacing:-.015em;line-height:1.25}.stage-exit{background:var(--bg-panel);border:1px solid var(--line);color:var(--ink-dim);padding:7px 13px;border-radius:999px;font-size:12.5px;flex:none}.stage-exit:hover{border-color:var(--bad);color:var(--bad)}.stage-body{flex:1;overflow-y:auto;padding:18px clamp(16px,3vw,30px) 8px;display:grid;gap:16px;align-content:start;min-height:0}.stage-speaker{display:grid;justify-items:center;gap:4px}.stage-orb{display:block}.stage-state{font-size:12.5px;color:var(--ink-dim)}.stage-caption{max-width:760px;margin:0 auto;text-align:center;line-height:1.55;color:var(--ink);background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:18px 24px;min-height:78px;display:flex;align-items:center;justify-content:center}.stage-content{max-width:820px;width:100%;margin:0 auto;display:grid;gap:14px}.stage-board{background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:18px 22px}.stage-check{background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:16px 20px;display:grid;gap:10px}.check-prompt{margin:0;font-size:15.5px}.check-reveal{justify-self:start;background:var(--bg-raised);border:1px solid var(--line);color:var(--ink);padding:9px 16px;border-radius:var(--radius-sm)}.check-verdict{margin:0;font-size:14px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}.check-verdict.ok{color:var(--good)}.check-verdict.bad{color:var(--bad)}.stage-controls{display:flex;align-items:center;gap:9px;flex-wrap:wrap;justify-content:center;padding:var(--s3) clamp(var(--s3),3vw,var(--s6)) var(--s4);border-top:var(--hairline) solid var(--line);background:color-mix(in srgb,var(--surface-1) 74%,transparent);backdrop-filter:var(--material);-webkit-backdrop-filter:var(--material)}.stage-controls button{background:var(--bg-panel);border:1px solid var(--line);color:var(--ink-dim);padding:9px 14px;border-radius:999px;font-size:13px}.stage-controls button:hover:not(:disabled){border-color:var(--accent);color:var(--ink)}.stage-controls button.is-on{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.stage-controls .control-play{width:40px;height:40px;flex:0 0 auto;padding:0;border:none;border-radius:var(--r-full);display:inline-grid;place-items:center;background:var(--ink);color:var(--bg)}.control-ask{margin-inline-start:8px}.control-rate{display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--ink-faint)}.control-rate select{background:var(--bg-input);border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:6px 8px;font-family:inherit;font-size:12.5px}.speak-toggle{width:36px;height:36px;border-radius:50%;background:var(--bg-panel);border:1px solid var(--line);color:var(--ink-dim);font-size:15px}.speak-toggle.is-on{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.voice-badge{margin-inline-start:8px;font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--ok);border:1px solid rgba(78,205,196,.35);background:var(--ok-tint);padding:1px var(--s2);border-radius:var(--r-full)}.panel-title,.media-heading{display:flex;align-items:center;gap:var(--s2)}.media-heading .icon{color:var(--ink-4)}.panel-title .icon{color:var(--brand)}.sources-banner .icon,.quiz-grounded .icon,.msg-warning .icon{flex:none}.quiz-grounded,.msg-warning,.panel-error{display:flex;align-items:center;gap:var(--s2)}.topbar-right{margin-inline-start:auto;display:flex;align-items:center;gap:var(--s2)}.health-pill{display:inline-flex;align-items:center;gap:var(--s1);background:var(--warn-tint);border:1px solid var(--warn-edge);color:var(--warn);padding:0 var(--s3);height:30px;border-radius:var(--r-full);font-size:var(--t-sm);font-weight:550}.live-toggle{display:inline-flex;align-items:center;gap:var(--s2);height:36px;padding:0 var(--s4);border-radius:var(--r-full);background:var(--surface-2);border:1px solid var(--line);color:var(--ink);font-weight:550;font-size:var(--t-md);transition:border-color .16s var(--ease),color .16s var(--ease)}.live-toggle:hover:not(:disabled){border-color:var(--brand-edge);color:var(--brand)}.speak-toggle{width:36px;height:36px;border-radius:var(--r-full);display:inline-flex;align-items:center;justify-content:center;background:var(--surface-2);border:1px solid var(--line);color:var(--ink-3);transition:color .16s var(--ease),border-color .16s var(--ease)}.speak-toggle:hover{color:var(--ink)}.speak-toggle.is-on{border-color:var(--brand-edge);color:var(--brand);background:var(--brand-tint)}.lang-trigger{height:36px;padding:0 var(--s3);border-radius:var(--r-full);background:var(--surface-2);border:1px solid var(--line);color:var(--ink);font-size:var(--t-md)}.lang-trigger .icon:first-child{color:var(--ink-3)}.lang-caret{color:var(--ink-4)}.history-row{padding:var(--s2) var(--s3)}.history-title{font-size:var(--t-md);font-weight:500}.history-sub{font-size:var(--t-xs)}.history-label{font-size:var(--t-xs);font-weight:600;letter-spacing:.08em}.sidebar-foot{display:grid;gap:var(--s1);padding-top:var(--s3)}.who{font-size:var(--t-md);color:var(--ink-2);display:flex;align-items:center;gap:var(--s2)}button.link{gap:var(--s2);font-size:var(--t-md)}.thread{padding:var(--s6) clamp(var(--s4),4vw,var(--s9)) var(--s2);gap:var(--s6)}.empty h2{font-size:var(--t-2xl);margin-bottom:var(--s6)}.empty-hint{font-size:var(--t-md);margin-top:var(--s6)}.empty-hint b{display:inline-flex;align-items:center;gap:var(--s1);color:var(--ink)}.msg-actions button{display:inline-flex;align-items:center;gap:var(--s2);height:30px;padding:0 var(--s3);border-radius:var(--r-full);background:var(--surface-1);border:1px solid var(--line-soft);color:var(--ink-3);font-size:var(--t-sm);font-weight:500;transition:color .16s var(--ease),border-color .16s var(--ease)}.msg-actions button:hover,.msg-actions button.is-active{border-color:var(--brand-edge);color:var(--brand)}.follow-ups button{height:32px;padding:0 var(--s3);font-size:var(--t-md);border-radius:var(--r-full);border:1px solid var(--line);background:transparent;color:var(--ink-2)}.follow-ups button:hover{border-color:var(--brand-edge);color:var(--ink)}.tag{font-size:var(--t-xs);padding:2px var(--s2);border-radius:var(--r-sm)}.panel{padding:var(--s6);gap:var(--s4);box-shadow:var(--shadow-sm)}.panel-title{font-size:var(--t-lg)}.panel-hint{font-size:var(--t-md);line-height:1.55}.stat{padding:var(--s5) var(--s3);border-radius:var(--r-md)}.stat-value{font-size:var(--t-2xl);font-weight:660}.stat-label{font-size:var(--t-xs)}.doc-status{display:inline-flex}.doc-status.is-ready{color:var(--ok)}.doc-status.is-failed{color:var(--bad)}.doc-status.is-processing,.doc-status.is-pending{color:var(--warn)}.doc-delete{display:inline-flex;color:var(--ink-4)}.doc-delete:hover{color:var(--bad)}.upload-zone{gap:var(--s2);padding:var(--s7);border-radius:var(--r-lg)}.upload-icon{color:var(--ink-3)}.upload-text{font-weight:600;font-size:var(--t-base)}.rail-back{display:inline-flex;align-items:center;gap:var(--s1);font-size:var(--t-sm)}.rail-doc{font-size:var(--t-md);font-weight:600}.stage-head h2{font-size:var(--t-xl)}.stage-step{font-size:var(--t-xs)}.stage-exit{display:inline-flex;align-items:center;gap:var(--s1);height:32px}.stage-caption{font-size:var(--t-lg);line-height:1.6;border-radius:var(--r-lg)}.stage-state{display:inline-flex;align-items:center;gap:var(--s2)}.toc-mark{display:inline-flex;align-items:center;justify-content:center}.stage-controls button{display:inline-flex;align-items:center;gap:var(--s2);height:36px}.control-rate{display:inline-flex;align-items:center;gap:var(--s2)}.control-rate .icon{color:var(--ink-4)}.picker-icon{display:inline-flex;color:var(--brand)}.picker-go{display:inline-flex}.picker-empty{gap:var(--s3);color:var(--ink-4)}@media(prefers-reduced-motion:reduce){.rail-progress-fill,.mastery-fill{transition:none!important}}.gate-features li{display:flex;align-items:center;gap:var(--s3)}.gate-features li .icon{color:var(--brand)}.quiz-feedback-misconception,.quiz-feedback-next{display:flex;align-items:center;gap:var(--s2)}.quiz-feedback-misconception .icon,.quiz-feedback-next .icon{color:var(--ink-4)}.tabs{position:relative;gap:0;padding:3px;background:color-mix(in srgb,var(--surface-3) 70%,transparent);-webkit-backdrop-filter:var(--material-thin);backdrop-filter:var(--material-thin);border:var(--hairline) solid var(--line);border-radius:var(--r-md)}.tabs button{position:relative;z-index:1;height:30px;padding:0 var(--s3);color:var(--ink-3);font-weight:500;font-size:var(--t-md);border-radius:var(--r-xs);transition:color var(--dur) var(--spring),transform var(--dur-fast) var(--spring-snap)}.tabs button:hover{color:var(--ink-2)}.tabs button.is-active{color:var(--ink);font-weight:550;background:var(--surface-1);box-shadow:0 1px 2px #00000029,0 0 0 var(--hairline) var(--line)}.tabs button .icon{transition:transform var(--dur) var(--spring)}.tabs button.is-active .icon{transform:scale(1.04)}.btn,.live-toggle,.speak-toggle,.lang-trigger,.new-session,.suggestions button,.picker-card,.msg-actions button,.follow-ups button{transition:background var(--dur) var(--spring),border-color var(--dur) var(--spring),color var(--dur) var(--spring),box-shadow var(--dur) var(--spring),transform var(--dur-fast) var(--spring-snap)}.suggestions button:hover,.picker-card:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-primary:hover:not(:disabled),.composer-send:hover:not(:disabled){transform:translateY(-1px);box-shadow:var(--shadow-md);filter:brightness(1.05)}.card,.panel,.msg-tutor .msg-bubble,.viz,.key-points,.stage-board,.stage-check,.stage-caption{border:var(--hairline) solid var(--line);border-radius:var(--r-lg)}.sidebar{background:color-mix(in srgb,var(--surface-1) 88%,transparent);-webkit-backdrop-filter:var(--material-thin);backdrop-filter:var(--material-thin)}.msg-user .msg-bubble{border-radius:var(--r-lg) var(--r-lg) var(--r-xs) var(--r-lg)}.msg-tutor .msg-bubble{border-radius:var(--r-xs) var(--r-lg) var(--r-lg) var(--r-lg)}.brand-badge{border-radius:var(--r-sm);box-shadow:0 1px 2px #00000038,inset 0 var(--hairline) 0 #ffffff38}.history-row{border-radius:var(--r-sm);transition:background var(--dur) var(--spring),color var(--dur) var(--spring)}.history-row.is-active{background:var(--surface-3);color:var(--ink);box-shadow:inset 0 0 0 var(--hairline) var(--line)}.composer-row{border:var(--hairline) solid var(--line);box-shadow:var(--shadow-sm)}.composer-row:focus-within{border-color:color-mix(in srgb,var(--brand) 55%,transparent);box-shadow:0 0 0 3.5px color-mix(in srgb,var(--brand) 20%,transparent),var(--shadow-sm)}.stage-caption{background:color-mix(in srgb,var(--surface-2) 82%,transparent);-webkit-backdrop-filter:var(--material-thin);backdrop-filter:var(--material-thin);border-radius:var(--r-xl)}.stage-controls{border-radius:0}.stage-controls .control-play{transition:transform var(--dur) var(--spring-snap),background var(--dur-fast) var(--ease)}.stage-controls .control-play:hover{transform:scale(1.06)}.stage-controls .control-play:active{transform:scale(.95)}.toc-row{border-radius:var(--r-sm);transition:background var(--dur) var(--spring)}.toc-row.is-current{box-shadow:inset 0 0 0 var(--hairline) var(--brand-edge)}.rail-progress-fill{transition:width var(--dur-slow) var(--spring)}.lang-menu{border:var(--hairline) solid var(--line);border-radius:var(--r-md);background:color-mix(in srgb,var(--surface-2) 88%,transparent);-webkit-backdrop-filter:var(--material);backdrop-filter:var(--material);transform-origin:top right;animation:menu-in var(--dur) var(--spring-snap)}[dir=rtl] .lang-menu{transform-origin:top left}@keyframes menu-in{0%{opacity:0;transform:scale(.94) translateY(-6px)}to{opacity:1;transform:scale(1) translateY(0)}}.lang-menu button{border-radius:var(--r-xs)}.msg{animation:settle var(--dur-slow) var(--spring)}@keyframes settle{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@media(prefers-reduced-motion:reduce){.msg,.lang-menu{animation:none}button:active:not(:disabled),.suggestions button:hover,.picker-card:hover,.control-play:hover{transform:none}}:root[data-theme=light]{--material: saturate(180%) blur(20px);--material-thin: saturate(140%) blur(12px);--shadow-sm: 0 1px 1px rgba(16, 24, 48, .05), 0 1px 3px rgba(16, 24, 48, .07);--shadow-md: 0 2px 4px rgba(16, 24, 48, .06), 0 8px 24px rgba(16, 24, 48, .1);--shadow-lg: 0 4px 8px rgba(16, 24, 48, .07), 0 24px 64px rgba(16, 24, 48, .14)}:root[data-theme=light] .topbar,:root[data-theme=light] .composer,:root[data-theme=light] .stage-controls{background:color-mix(in srgb,#ffffff 78%,transparent)}:root[data-theme=light] .tabs{background:color-mix(in srgb,#eef0f6 84%,transparent)}:root[data-theme=light] .brand-badge{box-shadow:0 1px 3px #3a51cc59}:root[data-theme=light] .md-code,:root[data-theme=light] .sim-canvas,:root[data-theme=light] .sort-bars{background:#f7f8fc}.thread{gap:var(--s7);padding-top:var(--s7)}.msg-body{gap:var(--s3)}.msg-tutor .msg-bubble{padding:var(--s5) var(--s6)}.panel{padding:var(--s6) var(--s7)}.stage-body{gap:var(--s5);padding-top:var(--s6)}.stage-caption{padding:var(--s5) var(--s7);min-height:88px}.stage-head{padding:var(--s5) clamp(var(--s4),3vw,var(--s7)) var(--s3)}.rail-head{padding:var(--s4) var(--s4) var(--s4)}.toc{padding:var(--s2) var(--s2) var(--s4)}.toc-row{padding:var(--s3)}.empty{padding-top:12vh}.empty h2{font-size:var(--t-3xl);margin-bottom:var(--s7)}.suggestions{gap:var(--s3)}.picker-inner{gap:var(--s4)}.picker-inner h2{font-size:var(--t-3xl)}.picker-card{padding:var(--s5) var(--s5);border-radius:var(--r-lg)}.gate-hero h1{font-size:clamp(38px,5.5vw,60px)}.gate-features li{padding:var(--s4) var(--s5);border-radius:var(--r-md)}.auth{padding:var(--s6);border-radius:var(--r-lg);gap:var(--s3)}.crash{min-height:100%;display:grid;place-content:center;padding:var(--s7)}.crash-card{max-width:460px;display:grid;justify-items:center;gap:var(--s4);text-align:center;background:var(--surface-2);border:var(--hairline) solid var(--line);border-radius:var(--r-xl);padding:var(--s8) var(--s7);box-shadow:var(--shadow-lg)}.crash-icon{width:52px;height:52px;border-radius:var(--r-full);display:grid;place-content:center;color:var(--bad);background:var(--bad-tint)}.crash-card h2{font-size:var(--t-xl)}.crash-card p{margin:0;color:var(--ink-2);font-size:var(--t-md)}.crash-detail{font-family:var(--mono);font-size:var(--t-sm);color:var(--ink-3);background:var(--surface-1);border-radius:var(--r-sm);padding:var(--s2) var(--s3);max-width:100%;overflow-wrap:anywhere}.crash-actions{display:flex;gap:var(--s2);flex-wrap:wrap;justify-content:center}.toasts{position:fixed;z-index:200;bottom:var(--s5);left:50%;transform:translate(-50%);display:grid;gap:var(--s2);width:min(440px,calc(100vw - var(--s7)));pointer-events:none}.toast{pointer-events:auto;display:flex;align-items:center;gap:var(--s3);padding:var(--s3) var(--s3) var(--s3) var(--s4);border-radius:var(--r-md);font-size:var(--t-md);background:color-mix(in srgb,var(--surface-2) 92%,transparent);-webkit-backdrop-filter:var(--material);backdrop-filter:var(--material);border:var(--hairline) solid var(--line);box-shadow:var(--shadow-lg);animation:toast-in var(--dur) var(--spring-snap)}@keyframes toast-in{0%{opacity:0;transform:translateY(10px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.toast-icon{flex:none}.toast-success .toast-icon{color:var(--ok)}.toast-error .toast-icon{color:var(--bad)}.toast-warning .toast-icon{color:var(--warn)}.toast-info .toast-icon{color:var(--brand)}.toast-success{border-color:var(--ok-edge)}.toast-error{border-color:var(--bad-edge)}.toast-warning{border-color:var(--warn-edge)}.toast-message{flex:1;min-width:0;color:var(--ink)}.toast-action{flex:none;color:var(--brand);font-weight:550;font-size:var(--t-md);padding:0 var(--s2)}.toast-close{flex:none;width:26px;height:26px;border-radius:var(--r-full);display:inline-flex;align-items:center;justify-content:center;color:var(--ink-4)}.toast-close:hover{color:var(--ink);background:var(--surface-3)}.offline-bar{display:flex;align-items:center;justify-content:center;gap:var(--s2);padding:var(--s2) var(--s4);font-size:var(--t-md);background:var(--warn-tint);color:var(--warn);border-bottom:var(--hairline) solid var(--warn-edge)}.offline-bar .link{color:inherit;text-decoration:underline;font-weight:550}.cmdk-hint{display:inline-flex;align-items:center;gap:var(--s2);height:36px;padding:0 var(--s3);border-radius:var(--r-full);background:var(--surface-2);border:var(--hairline) solid var(--line);color:var(--ink-3);transition:color var(--dur) var(--spring),border-color var(--dur) var(--spring)}.cmdk-hint:hover{color:var(--ink);border-color:var(--brand-edge)}.cmdk-hint kbd,.palette-kbd{font-family:var(--font);font-size:var(--t-xs);font-weight:550;color:var(--ink-4);background:var(--surface-3);border:var(--hairline) solid var(--line);border-radius:var(--r-xs);padding:1px var(--s2);line-height:1.5}.palette-scrim{position:fixed;top:0;right:0;bottom:0;left:0;z-index:300;display:grid;justify-items:center;align-items:start;padding:12vh var(--s4) var(--s4);background:color-mix(in srgb,var(--bg) 55%,transparent);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);animation:fade-in var(--dur-fast) var(--spring)}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.palette{width:min(620px,100%);max-height:62vh;display:flex;flex-direction:column;background:color-mix(in srgb,var(--surface-2) 92%,transparent);-webkit-backdrop-filter:var(--material);backdrop-filter:var(--material);border:var(--hairline) solid var(--line-strong);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);overflow:hidden;animation:palette-in var(--dur) var(--spring-snap)}@keyframes palette-in{0%{opacity:0;transform:scale(.96) translateY(-10px)}to{opacity:1;transform:scale(1) translateY(0)}}.palette-search{display:flex;align-items:center;gap:var(--s3);padding:var(--s4) var(--s4);border-bottom:var(--hairline) solid var(--line);color:var(--ink-3)}.palette-input{flex:1;background:none;border:none;color:var(--ink);font:inherit;font-size:var(--t-lg);letter-spacing:var(--track-lg)}.palette-input:focus{outline:none;box-shadow:none}.palette-input::placeholder{color:var(--ink-4)}.palette-list{overflow-y:auto;padding:var(--s2)}.palette-group{padding:var(--s3) var(--s3) var(--s1);font-size:var(--t-xs);font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-4)}.palette-row{width:100%;display:flex;align-items:center;gap:var(--s3);padding:var(--s3);border-radius:var(--r-sm);color:var(--ink-2);text-align:start;font-size:var(--t-md)}.palette-row.is-active{background:var(--brand-tint);color:var(--ink)}.palette-row.is-active .icon{color:var(--brand)}.palette-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.palette-hint{color:var(--ink-4);font-size:var(--t-sm);flex:none}.palette-empty{padding:var(--s7);text-align:center;color:var(--ink-4);margin:0}@media(prefers-reduced-motion:reduce){.toast,.palette,.palette-scrim{animation:none}}.adapted-note{display:flex;align-items:center;gap:var(--s2);padding:var(--s2) var(--s3);border-radius:var(--r-sm);background:var(--brand-tint);border:var(--hairline) solid var(--brand-edge);color:var(--brand);font-size:var(--t-sm)}.adapted-note .icon{flex:none}@media(pointer:coarse){.btn,.tabs button,.composer-icon,.composer-send,.speak-toggle,.lang-trigger,.live-toggle,.msg-actions button,.follow-ups button,.stage-controls button,.toc-row,.history-row,.suggestions button,.bottom-nav button,.link,.rail-back,.stage-exit,.doc-delete,.quiz-option,.rec-card,.picker-card,.hit,.lang-menu button,.palette-row,.toast-close,.toast-action,.sidebar-close,.hamburger,.new-session,.auth-tabs button,.check-reveal,.sim-buttons button{min-height:44px}.link,.rail-back{display:inline-flex;align-items:center}.composer-icon,.composer-send,.speak-toggle{min-width:44px}.suggestions button:hover,.picker-card:hover,.btn-primary:hover,.composer-send:hover,.control-play:hover{transform:none;box-shadow:inherit}}@media(max-width:1200px){.app{grid-template-columns:240px 1fr}.classroom{grid-template-columns:260px 1fr}}@media(max-width:900px){.tab-label{display:none}.tabs button{padding:0 var(--s3)}.lang-native,.live-toggle span,.cmdk-hint kbd{display:none}.thread>*,.composer>*,.panel{max-width:100%}}@media(max-width:820px){.app{grid-template-columns:1fr}.sidebar{position:fixed;inset-block:0;inset-inline-start:0;z-index:90;width:min(300px,84vw);padding-top:calc(var(--s4) + var(--safe-t));padding-bottom:calc(var(--s4) + var(--safe-b));padding-inline-start:calc(var(--s3) + var(--safe-l));transform:translate(-102%);transition:transform var(--dur) var(--spring);box-shadow:var(--shadow-lg);background:var(--surface-1)}[dir=rtl] .sidebar{transform:translate(102%)}.sidebar.is-open{transform:translate(0)}.sidebar-close,.hamburger{display:inline-flex}.scrim{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:80;background:color-mix(in srgb,var(--bg) 62%,transparent);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);animation:fade-in var(--dur-fast) var(--spring)}.classroom{grid-template-columns:1fr;grid-template-rows:auto 1fr}.room-rail{max-height:30vh;border-inline-end:none;border-bottom:var(--hairline) solid var(--line)}.gate{grid-template-columns:1fr;padding:var(--s7) var(--s5);align-content:start}.gate-form{max-width:520px}}@media(max-width:700px){:root{--bottom-nav-h: calc(58px + var(--safe-b));--t-base: 15px;--t-lg: 16.5px;--t-xl: 19px;--t-2xl: 23px;--t-3xl: 27px}.topbar{min-height:54px;gap:var(--s2);padding:var(--s2) calc(var(--s3) + var(--safe-r)) var(--s2) calc(var(--s3) + var(--safe-l));padding-top:calc(var(--s2) + var(--safe-t))}.topbar .tabs{display:none}.live-toggle{width:40px;padding:0;justify-content:center;border-radius:var(--r-full)}.live-toggle span{display:none}.topbar-right{gap:var(--s1)}.cmdk-hint,.health-pill span{display:none}.bottom-nav{display:flex;position:fixed;inset-inline:0;bottom:0;z-index:60;padding:var(--s1) var(--s2) calc(var(--s1) + var(--safe-b));background:color-mix(in srgb,var(--surface-1) 82%,transparent);-webkit-backdrop-filter:var(--material);backdrop-filter:var(--material);border-top:var(--hairline) solid var(--line)}.bottom-nav button{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;min-height:52px;color:var(--ink-4);font-size:10.5px;font-weight:500;border-radius:var(--r-sm);letter-spacing:0}.bottom-nav button.is-active{color:var(--brand)}.bottom-nav button .icon{transition:transform var(--dur) var(--spring)}.bottom-nav button.is-active .icon{transform:scale(1.1) translateY(-1px)}.composer{padding:var(--s2) var(--s3) calc(var(--s2) + var(--bottom-nav-h))}.stage-controls{padding:var(--s2) var(--s2) calc(var(--s2) + var(--bottom-nav-h));gap:var(--s1);flex-wrap:wrap}.toasts{bottom:calc(var(--bottom-nav-h) + var(--s3));width:calc(100vw - var(--s5))}.thread{padding:var(--s5) var(--s4) var(--s2);gap:var(--s5)}.msg-user .msg-bubble{max-width:90%}.msg-avatar{display:none}.msg-tutor .msg-bubble{padding:var(--s4);border-radius:var(--r-lg)}.msg-tutor .msg-body{gap:var(--s2)}.empty{padding-top:6vh}.suggestions{gap:var(--s2)}.suggestions button{width:100%;justify-content:flex-start}.panel{padding:var(--s5) var(--s4);border-radius:var(--r-md)}.panel-scroll{padding:var(--s4) var(--s3) calc(var(--s6) + var(--bottom-nav-h))}.stat-grid{grid-template-columns:repeat(2,1fr)}.topic-row{grid-template-columns:1fr auto;row-gap:var(--s1)}.topic-row .mastery-track{grid-column:1 / -1}.room-rail{max-height:26vh}.rail-head{padding:var(--s3)}.toc-summary{display:none}.stage-head{padding:var(--s3) var(--s4) var(--s2)}.stage-body{padding:var(--s3) var(--s3) var(--s2);gap:var(--s3)}.stage-caption{font-size:var(--t-base);padding:var(--s4);min-height:64px;border-radius:var(--r-md)}.stage-orb{width:96px!important;height:96px!important}.control-rate,.stage-controls button span{display:none}.stage-controls button{min-width:44px;padding:0 var(--s3);justify-content:center}.stage-controls{flex-wrap:nowrap;justify-content:space-around}.room-rail{max-height:22vh}.palette-scrim{padding:var(--s4) var(--s3);align-items:end}.palette{max-height:76vh}.chart-surface{height:240px}.media-card{width:168px}.sim-canvas{height:200px}}@media(max-width:380px){:root{--t-base: 14.5px}.bottom-nav button{font-size:9.5px}.brand{font-size:var(--t-md)}.topbar-right .lang-trigger{padding:0 var(--s2)}}@media(max-height:500px)and (orientation:landscape){.bottom-nav{display:none}:root{--bottom-nav-h: 0px}.topbar .tabs{display:flex}.empty{padding-top:var(--s4)}.empty h2{font-size:var(--t-xl);margin-bottom:var(--s4)}.room-rail{max-height:100%}.classroom{grid-template-columns:220px 1fr;grid-template-rows:1fr}.stage-speaker{display:none}.stage-caption{font-size:var(--t-md);padding:var(--s3)}}@media(min-width:1600px){.thread>*,.composer>*{max-width:780px}.stage-content,.stage-caption{max-width:900px}}@media(prefers-reduced-motion:reduce){.sidebar,.scrim{transition:none;animation:none}}.topbar{background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:var(--material-thin);backdrop-filter:var(--material-thin);border-bottom:var(--hairline) solid var(--line);min-height:60px}.brand{font-weight:var(--w-medium);letter-spacing:var(--track-lg)}.brand-badge{background:var(--ink);color:var(--bg);border-radius:var(--r-sm);box-shadow:none}:root[data-theme=dark] .brand-badge{background:var(--brand);color:#fff}.tabs{background:none;border:none;padding:0;gap:var(--s1);border-radius:0}.tabs button{height:36px;padding:0 var(--s3);border-radius:var(--r-sm);color:var(--ink-3);font-weight:var(--w-normal);box-shadow:none;background:none}.tabs button:hover{color:var(--ink);background:var(--surface-3)}.tabs button.is-active{color:var(--ink);background:var(--surface-4);box-shadow:none;font-weight:var(--w-medium)}.tabs button.is-active .icon{transform:none}.live-toggle,.speak-toggle,.lang-trigger,.cmdk-hint{background:var(--surface-1);border:var(--hairline) solid var(--line);color:var(--ink-2);border-radius:var(--r-sm);height:36px;font-weight:var(--w-normal);white-space:nowrap;flex:none;padding:0 var(--s3)}.topbar-right{flex:none}.live-toggle:hover:not(:disabled),.speak-toggle:hover,.lang-trigger:hover,.cmdk-hint:hover{background:var(--surface-3);border-color:var(--line-strong);color:var(--ink)}.speak-toggle{width:36px;border-radius:var(--r-sm)}.speak-toggle.is-on{background:var(--brand-tint);border-color:var(--brand-edge);color:var(--brand)}.live-toggle.is-live{background:var(--bad-tint);border-color:var(--bad-edge);color:var(--bad)}.sidebar{background:var(--surface-1);border-inline-end:var(--hairline) solid var(--line);-webkit-backdrop-filter:none;backdrop-filter:none}.new-session{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-sm);font-weight:var(--w-normal);height:36px}.new-session:hover{background:var(--surface-3);border-color:var(--line-strong)}.history-label{font-size:var(--t-sm);font-weight:var(--w-normal);text-transform:none;letter-spacing:var(--track-sm);color:var(--ink-4)}.history-row{border-radius:var(--r-sm)}.history-row.is-active{background:var(--surface-4);box-shadow:none}.history-title{font-weight:var(--w-normal)}.empty h2{font-weight:var(--w-light);letter-spacing:var(--track-3xl);text-wrap:balance;max-width:18ch;margin-inline:auto}.suggestions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s2);max-width:540px;margin-inline:auto;text-align:start}.suggestions button{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-md);color:var(--ink-2);height:auto;min-height:46px;padding:var(--s3) var(--s4);font-weight:var(--w-normal);line-height:1.4;text-align:start;transition:background var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease)}.suggestions button:hover{background:var(--surface-3);border-color:var(--line-strong);color:var(--ink)}.suggestions button:active{background:var(--surface-4)}@media(max-width:560px){.suggestions{grid-template-columns:1fr;max-width:none}}.msg-tutor .msg-bubble{background:none;border:none;border-radius:0;padding:0;box-shadow:none}.msg-avatar{background:none;border:var(--hairline) solid var(--line);border-radius:var(--r-sm);color:var(--ink-3)}.msg-user .msg-bubble{background:var(--surface-4);border:var(--hairline) solid var(--line);color:var(--ink);border-radius:var(--r-md);box-shadow:none}.md strong{font-weight:var(--w-strong)}.msg-actions button,.follow-ups button{background:none;border:var(--hairline) solid var(--line);border-radius:var(--r-sm);color:var(--ink-2);font-weight:var(--w-normal)}.msg-actions button:hover,.follow-ups button:hover{background:var(--surface-3);border-color:var(--line-strong);color:var(--ink)}.follow-ups-label{text-transform:none;letter-spacing:var(--track-sm);font-size:var(--t-sm);color:var(--ink-4)}.tag{background:none;border:var(--hairline) solid var(--line-soft);color:var(--ink-4);border-radius:var(--r-xs)}.composer{background:color-mix(in srgb,var(--bg) 90%,transparent);border-top:var(--hairline) solid var(--line)}.composer-row{background:var(--surface-1);border:var(--hairline) solid var(--line-strong);border-radius:var(--r-md);box-shadow:none}.composer-row:focus-within{border-color:var(--ink);box-shadow:none}.composer-send{background:var(--ink);color:var(--bg);border-radius:var(--r-sm);width:34px;height:34px;box-shadow:none}.composer-send:hover:not(:disabled){background:#000;transform:none;filter:none}:root[data-theme=dark] .composer-send{background:var(--ink);color:#0a0a0b}.panel,.viz,.key-points,.stage-board,.stage-check,.stage-caption,.card{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-md);box-shadow:none}.viz-title,.media-heading{text-transform:none;letter-spacing:var(--track-sm);font-size:var(--t-md);font-weight:var(--w-medium);color:var(--ink-2)}.panel-title{font-weight:var(--w-medium)}.stat{background:none;border:none;border-inline-end:var(--hairline) solid var(--line);border-radius:0;padding:var(--s4) var(--s3)}.stat:last-child{border-inline-end:none}.stat-value{font-weight:var(--w-light);letter-spacing:var(--track-2xl)}.stat-label{color:var(--ink-4)}.sources-banner{background:none}.sources{border-radius:var(--r-sm)}.room-rail{background:var(--surface-1);border-inline-end:var(--hairline) solid var(--line)}.room-stage{background:none}.toc-row.is-current{background:var(--surface-4);box-shadow:none}.toc-mark{border:var(--hairline) solid var(--line);font-weight:var(--w-normal)}.toc-row.is-current .toc-mark{background:var(--ink);border-color:var(--ink);color:var(--bg)}.toc-row.is-done .toc-mark{background:none;border-color:var(--ok);color:var(--ok)}.stage-caption{font-weight:var(--w-light);letter-spacing:var(--track-lg)}.stage-controls{background:color-mix(in srgb,var(--bg) 90%,transparent);border-top:var(--hairline) solid var(--line)}.stage-controls button{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-sm);color:var(--ink-2);font-weight:var(--w-normal)}.stage-controls button.is-on{background:var(--brand-tint);border-color:var(--brand-edge);color:var(--brand)}:root[data-theme=dark] .stage-controls .control-play{background:var(--brand);color:#fff}.picker-card{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-md)}.picker-card:hover{border-color:var(--line-strong);background:var(--surface-3);box-shadow:none}.picker-title{font-weight:var(--w-medium)}.rail-progress-fill{background:var(--ink)}.palette,.lang-menu,.toast{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-md);-webkit-backdrop-filter:none;backdrop-filter:none;box-shadow:var(--shadow-lg)}.palette-group{text-transform:none;letter-spacing:var(--track-sm);font-size:var(--t-sm);font-weight:var(--w-normal);color:var(--ink-4)}.palette-row.is-active{background:var(--surface-4);color:var(--ink)}.palette-row.is-active .icon{color:var(--ink)}.palette-input{font-weight:var(--w-light);letter-spacing:var(--track-lg)}.palette-scrim{background:#11182747;-webkit-backdrop-filter:none;backdrop-filter:none}.cmdk-hint kbd,.palette-kbd{background:var(--surface-3);border-color:var(--line);color:var(--ink-4);border-radius:var(--r-xs)}.bottom-nav{background:color-mix(in srgb,var(--bg) 92%,transparent);border-top:var(--hairline) solid var(--line)}.bottom-nav button{font-weight:var(--w-normal)}.bottom-nav button.is-active{color:var(--ink)}.gate-hero h1{font-weight:var(--w-light);letter-spacing:var(--track-3xl)}.gate-badge{background:var(--ink);color:var(--bg);border:none}:root[data-theme=dark] .gate-badge{background:var(--brand);color:#fff}.gate-features{border-top:var(--hairline) solid var(--line);gap:0}.gate-features li{background:none;border:none;border-bottom:var(--hairline) solid var(--line);border-radius:0;padding:var(--s4) 0;color:var(--ink-2)}.auth{border:var(--hairline) solid var(--line);border-radius:var(--r-md);box-shadow:none}.auth-tabs button.is-active{background:var(--surface-4);border-color:transparent;color:var(--ink)}.quiz-option{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-sm);font-weight:var(--w-normal)}.quiz-option.is-picked{border-color:var(--ink);background:var(--surface-3)}.quiz-score{background:none;border:var(--hairline) solid var(--line);border-radius:var(--r-md)}.quiz-score-value{font-weight:var(--w-light);letter-spacing:var(--track-3xl)}.upload-zone{background:var(--surface-3);border:var(--hairline) dashed var(--line-strong);border-radius:var(--r-md)}.upload-text{font-weight:var(--w-medium)}.doc-row,.hit,.rec-card{background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-sm)}.rec-title{font-weight:var(--w-medium)}.app.is-focused{grid-template-columns:1fr}.app.is-focused .sidebar{transform:translate(-102%);position:fixed;inset-block:0;inset-inline-start:0;width:min(280px,84vw);z-index:90;box-shadow:var(--shadow-lg)}.app.is-focused .sidebar.is-open{transform:translate(0)}.app.is-focused .hamburger{display:inline-flex}.picker-upload{display:grid;justify-items:center;gap:var(--s1);padding:var(--s8) var(--s6);width:100%;border:var(--hairline) dashed var(--line-strong);border-radius:var(--r-md);background:var(--surface-3);color:var(--ink-2);transition:border-color var(--dur) var(--spring),background var(--dur) var(--spring)}.picker-upload:hover:not(:disabled),.picker-upload.is-dragging{border-color:var(--ink);background:var(--surface-4);color:var(--ink)}.picker-upload .icon{color:var(--ink-3)}.picker-upload-title{font-size:var(--t-base);font-weight:var(--w-medium);color:var(--ink)}.picker-upload-hint{font-size:var(--t-sm);color:var(--ink-4)}.picker-upload-spinner{width:22px;height:22px;border-radius:50%;border:2px solid var(--line);border-top-color:var(--ink);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.picker-divider{display:flex;align-items:center;gap:var(--s3);margin:var(--s2) 0;color:var(--ink-4);font-size:var(--t-sm)}.picker-divider:before,.picker-divider:after{content:"";flex:1;height:var(--hairline);background:var(--line)}.picker-note{color:var(--ink-4);font-size:var(--t-sm);text-align:center;margin:0}.picker-go{color:var(--ink-3);font-size:var(--t-sm)}.stage-caption{display:flex;align-items:center;gap:var(--s4);text-align:start;padding:var(--s4) var(--s5);min-height:0}.stage-speaker{flex:none;display:block}.stage-orb{width:40px!important;height:40px!important}.stage-caption-text{flex:1;min-width:0}.stage-eta{color:var(--ink-4)}.voice-badge{flex:none}.stage-controls{flex-wrap:nowrap;gap:var(--s2)}.stage-controls button{flex:none}.control-ask{margin-inline-start:auto}.course-complete{display:grid;justify-items:center;gap:var(--s3);text-align:center;padding:var(--s8) var(--s6);border:var(--hairline) solid var(--line);border-radius:var(--r-md);background:var(--surface-1)}.course-complete-mark{width:48px;height:48px;border-radius:var(--r-full);display:grid;place-content:center;background:var(--ok-tint);color:var(--ok)}.course-complete h3{font-weight:var(--w-light);letter-spacing:var(--track-xl)}.course-complete p{margin:0;color:var(--ink-2)}.course-complete-actions{display:flex;gap:var(--s2);flex-wrap:wrap;justify-content:center}@media(max-width:700px){.app.is-focused{grid-template-columns:1fr}.picker-upload{padding:var(--s7) var(--s4)}.stage-caption{gap:var(--s3);padding:var(--s4)}.stage-orb{width:32px!important;height:32px!important}.stage-controls{justify-content:space-between}.control-ask{margin-inline-start:0}}@media(prefers-reduced-motion:reduce){.picker-upload-spinner{animation-duration:2s}}.quiz-suggestions{display:grid;gap:var(--s2)}.quiz-suggestion{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:var(--s3);width:100%;text-align:start;padding:var(--s3) var(--s4);border-radius:var(--r-sm);background:var(--surface-1);border:var(--hairline) solid var(--line);color:var(--ink);transition:border-color var(--dur) var(--spring),background var(--dur) var(--spring)}.quiz-suggestion:hover:not(:disabled){border-color:var(--line-strong);background:var(--surface-3)}.quiz-suggestion-icon{display:inline-flex;color:var(--ink-4)}.quiz-suggestion.is-weak{border-color:var(--warn-edge);background:var(--warn-tint)}.quiz-suggestion.is-weak .quiz-suggestion-icon{color:var(--warn)}.quiz-suggestion-body{display:grid;gap:1px;min-width:0}.quiz-suggestion-topic{font-weight:var(--w-medium)}.quiz-suggestion-reason{font-size:var(--t-sm);color:var(--ink-3)}.quiz-suggestion-mastery{font-family:var(--mono);font-size:var(--t-sm);color:var(--ink-4)}.quiz-form{display:flex;gap:var(--s2)}.history-head{display:flex;align-items:center;justify-content:space-between}.history-clear{width:26px;height:26px;border-radius:var(--r-xs);color:var(--ink-4);display:inline-flex;align-items:center;justify-content:center}.history-clear:hover{color:var(--bad);background:var(--bad-tint)}.history-row{display:flex;align-items:stretch;gap:0;padding:0}.history-open{flex:1;min-width:0;display:grid;gap:1px;text-align:start;padding:var(--s2) var(--s3);border-radius:var(--r-sm)}.history-delete{flex:none;width:28px;border-radius:var(--r-sm);color:var(--ink-4);display:inline-flex;align-items:center;justify-content:center;opacity:0;transition:opacity var(--dur) var(--spring),color var(--dur) var(--spring)}.history-row:hover .history-delete,.history-delete:focus-visible{opacity:1}.history-delete:hover{color:var(--bad);background:var(--bad-tint)}@media(pointer:coarse){.history-delete{opacity:1}}.confirm{width:min(420px,100%);display:grid;justify-items:center;gap:var(--s3);text-align:center;padding:var(--s7) var(--s6);background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-md);box-shadow:var(--shadow-lg);animation:palette-in var(--dur) var(--spring-snap)}.confirm-icon{width:44px;height:44px;border-radius:var(--r-full);display:grid;place-content:center;background:var(--bad-tint);color:var(--bad)}.confirm h3{font-weight:var(--w-medium);font-size:var(--t-lg)}.confirm p{margin:0;color:var(--ink-2);font-size:var(--t-md)}.confirm-note{color:var(--ink-4)!important;font-size:var(--t-sm)!important}.confirm-actions{display:flex;gap:var(--s2);margin-top:var(--s2)}.btn-danger{background:var(--bad);color:#fff;border-color:var(--bad)}.btn-danger:hover:not(:disabled){filter:brightness(.94)}.picker-empty{display:grid;justify-items:center;gap:var(--s4);padding:var(--s8) var(--s4);text-align:center}.picker-bar{display:block;height:3px;margin-top:var(--s2);border-radius:var(--r-full);background:var(--surface-4);overflow:hidden}.picker-bar-fill{display:block;height:100%;background:var(--brand);border-radius:inherit;transform-origin:left center;transition:transform var(--dur-slow) var(--ease)}@media(prefers-reduced-motion:reduce){.picker-bar-fill{transition:none}}.stagger-item{animation:stagger-in var(--dur-slow) var(--spring-snap) backwards;animation-delay:calc(min(var(--i, 0),8)*34ms)}@keyframes stagger-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){.stagger-item{animation:none}}.composer-dock{position:relative}.jump-latest{position:absolute;bottom:calc(100% + var(--s3));left:50%;transform:translate(-50%);width:34px;height:34px;border-radius:var(--r-full);display:grid;place-content:center;background:var(--surface-1);color:var(--ink-2);border:var(--hairline) solid var(--line);box-shadow:var(--shadow-md);animation:jump-in var(--dur) var(--spring-snap);z-index:2}.jump-latest:hover{color:var(--ink);border-color:var(--line-strong)}.jump-latest:active{transform:translate(-50%) scale(.94)}@keyframes jump-in{0%{opacity:0;transform:translate(-50%) translateY(4px)}to{opacity:1;transform:translate(-50%)}}@media(prefers-reduced-motion:reduce){.jump-latest{animation:none}}.msg-user{position:relative;align-items:flex-start;gap:var(--s2)}.msg-edit-open{align-self:center;width:26px;height:26px;border-radius:var(--r-sm);display:grid;place-content:center;order:-1;background:none;border:none;color:var(--ink-4);opacity:0;transition:opacity var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease)}.msg-user:hover .msg-edit-open,.msg-edit-open:focus-visible{opacity:1}.msg-edit-open:hover{color:var(--ink-2);background:var(--surface-3)}.msg-edit-open:disabled{opacity:0;pointer-events:none}@media(hover:none){.msg-edit-open{opacity:1}}.msg-user.is-editing{justify-content:stretch}.msg-edit{flex:1;display:grid;gap:var(--s3)}.msg-edit textarea{width:100%;resize:none;overflow:hidden;font:inherit;font-size:max(16px,var(--t-base));line-height:1.6;color:var(--ink);background:var(--surface-1);border:var(--hairline) solid var(--line-strong);border-radius:var(--r-md);padding:var(--s3) var(--s4)}.msg-edit textarea:focus-visible{border-color:var(--brand);box-shadow:var(--ring);outline:none}.msg-edit-actions{display:flex;gap:var(--s2);justify-content:flex-end}.composer-add{position:relative;display:flex}.add-menu{position:absolute;bottom:calc(100% + var(--s2));left:0;min-width:232px;padding:var(--s2);background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);display:grid;gap:2px;z-index:30;animation:menu-rise var(--dur) var(--spring-snap)}@keyframes menu-rise{0%{opacity:0;transform:translateY(4px) scale(.985)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){.add-menu{animation:none}}.add-item{display:flex;align-items:center;gap:var(--s3);min-height:40px;padding:0 var(--s3);background:none;border:none;border-radius:var(--r-sm);color:var(--ink-2);font-size:var(--t-md);text-align:start;width:100%}.add-item:hover,.add-item:focus-visible{background:var(--surface-3);color:var(--ink)}.add-item-label{flex:1}.add-note{margin:var(--s2) var(--s3) var(--s1);padding-top:var(--s2);border-top:var(--hairline) solid var(--line-soft);color:var(--ink-4);font-size:var(--t-xs);line-height:1.45}.voice-bar{position:absolute;bottom:calc(100% + var(--s3));right:0;display:flex;align-items:center;gap:var(--s1);padding:var(--s1) var(--s2);background:var(--surface-1);border:var(--hairline) solid var(--line);border-radius:var(--r-full);box-shadow:var(--shadow-md);z-index:3;animation:jump-in var(--dur) var(--spring-snap)}@media(prefers-reduced-motion:reduce){.voice-bar{animation:none}}.voice-bar button{width:28px;height:28px;border-radius:var(--r-full);display:grid;place-content:center;background:none;border:none;color:var(--ink-3)}.voice-bar button:hover{background:var(--surface-3);color:var(--ink)}.voice-rate{width:auto!important;padding:0 var(--s2);font-size:var(--t-xs);font-variant-numeric:tabular-nums}.voice-state{display:inline-flex;align-items:center;gap:var(--s2);padding:0 var(--s2) 0 var(--s3);font-size:var(--t-xs);color:var(--ink-3);white-space:nowrap}.voice-dot{width:6px;height:6px;border-radius:var(--r-full);background:var(--ink-4)}.voice-state.is-speaking .voice-dot{background:var(--ok);animation:voice-pulse 1.4s ease-in-out infinite}.voice-state.is-buffering .voice-dot{background:var(--warn);animation:voice-pulse .9s ease-in-out infinite}.voice-state.is-paused .voice-dot{background:var(--ink-4)}@keyframes voice-pulse{0%,to{opacity:1}50%{opacity:.35}}@media(prefers-reduced-motion:reduce){.voice-dot{animation:none!important}}@media(max-width:560px){.voice-state{display:none}}.generated-figure{margin:0;display:grid;gap:var(--s2);max-width:var(--measure)}.generated-figure img{width:100%;height:auto;display:block;border:var(--hairline) solid var(--line);border-radius:var(--r-md);background:var(--surface-3)}.generated-figure figcaption{font-size:var(--t-xs);color:var(--ink-4);line-height:1.5}.panel-block{display:grid;gap:var(--s2)}.quiz-review-head{display:flex;align-items:baseline;justify-content:space-between;gap:var(--s3)}.quiz-review-head .media-heading{margin:0}.quiz-breakdown-a{display:grid;gap:var(--s1);margin-top:var(--s2);font-size:var(--t-sm);color:var(--ink-3)}.dash{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s6);max-width:820px;margin:0 auto}.dash .doc-meta{min-width:0}.dash .doc-title{overflow-wrap:anywhere}.dash>.panel{margin:0;max-width:none}.dash .doc-row{text-align:start;width:100%}.dash .doc-row:hover{border-color:var(--line-strong);background:var(--surface-3)}.dash .doc-row:active{background:var(--surface-4)}.dash-guest{text-align:center}.dash-overall{display:grid;gap:var(--s2);margin-top:var(--s2)}.dash-overall-head{display:flex;justify-content:space-between;align-items:baseline;font-size:var(--t-sm);color:var(--ink-3)}.dash-overall-count{font-variant-numeric:tabular-nums;color:var(--ink-2)}.dash-overall .picker-bar{height:6px}