@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2) format("woff2"),url(/assets/KaTeX_AMS-Regular-DMm9YOAa.woff) format("woff"),url(/assets/KaTeX_AMS-Regular-DRggAlZN.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Bold-ATXxdsX0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Regular-wX97UBjC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff) format("woff"),url(/assets/KaTeX_Fraktur-Bold-BdnERNNW.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff) format("woff"),url(/assets/KaTeX_Fraktur-Regular-CB_wures.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Main-Bold-Cx986IdX.woff2) format("woff2"),url(/assets/KaTeX_Main-Bold-Jm3AIy58.woff) format("woff"),url(/assets/KaTeX_Main-Bold-waoOVXN0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2) format("woff2"),url(/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff) format("woff"),url(/assets/KaTeX_Main-BoldItalic-DzxPMmG6.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2) format("woff2"),url(/assets/KaTeX_Main-Italic-BMLOBm91.woff) format("woff"),url(/assets/KaTeX_Main-Italic-3WenGoN9.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2) format("woff2"),url(/assets/KaTeX_Main-Regular-Dr94JaBh.woff) format("woff"),url(/assets/KaTeX_Main-Regular-ypZvNtVU.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2) format("woff2"),url(/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff) format("woff"),url(/assets/KaTeX_Math-BoldItalic-B3XSjfu4.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2) format("woff2"),url(/assets/KaTeX_Math-Italic-DA0__PXp.woff) format("woff"),url(/assets/KaTeX_Math-Italic-flOr_0UB.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff) format("woff"),url(/assets/KaTeX_SansSerif-Bold-CFMepnvq.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff) format("woff"),url(/assets/KaTeX_SansSerif-Italic-YYjJ1zSn.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff) format("woff"),url(/assets/KaTeX_SansSerif-Regular-BNo7hRIc.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Script-Regular-D3wIWfF6.woff2) format("woff2"),url(/assets/KaTeX_Script-Regular-D5yQViql.woff) format("woff"),url(/assets/KaTeX_Script-Regular-C5JkGWo-.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2) format("woff2"),url(/assets/KaTeX_Size1-Regular-C195tn64.woff) format("woff"),url(/assets/KaTeX_Size1-Regular-Dbsnue_I.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2) format("woff2"),url(/assets/KaTeX_Size2-Regular-oD1tc_U0.woff) format("woff"),url(/assets/KaTeX_Size2-Regular-B7gKUWhC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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) format("woff2"),url(/assets/KaTeX_Size3-Regular-CTq5MqoE.woff) format("woff"),url(/assets/KaTeX_Size3-Regular-DgpXs0kz.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2) format("woff2"),url(/assets/KaTeX_Size4-Regular-BF-4gkZK.woff) format("woff"),url(/assets/KaTeX_Size4-Regular-DWFBv043.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2) format("woff2"),url(/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff) format("woff"),url(/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf) format("truetype")}.katex{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;position:relative;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.18.7"}.katex .katex-mathml{border:0;-webkit-clip-path:inset(50%);clip-path:inset(50%);height:1px;overflow:hidden;padding:0;position:absolute;width:1px}.katex .katex-html>.katex-newline{display:block}.katex .katex-base{position:relative;white-space:nowrap;width:-webkit-min-content;width:-moz-min-content;width:min-content}.katex .katex-base,.katex .katex-strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;display:inline-table;table-layout:fixed}.katex .vlist-r{display:table-row}.katex .vlist{display:table-cell;position:relative;vertical-align:bottom}.katex .vlist>span{display:block;height:0;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{overflow:hidden;width:0}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{display:table-cell;font-size:1px;min-width:2px;vertical-align:bottom;width:2px}.katex .katex-vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .katex-thinbox{display:inline-flex;flex-direction:row;max-width:0;width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .katex-hdashline,.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-rule,.katex .katex-underline .underline-line,.katex .mfrac .frac-line{min-height:1px}.katex .mspace{display:inline-block}.katex .katex-smash{display:inline;line-height:0}.katex .clap,.katex .llap,.katex .rlap{position:relative;width:0}.katex .clap>.katex-inner,.katex .llap>.katex-inner,.katex .rlap>.katex-inner{position:absolute}.katex .clap>.katex-fix,.katex .llap>.katex-fix,.katex .rlap>.katex-fix{display:inline-block}.katex .llap>.katex-inner{right:0}.katex .clap>.katex-inner,.katex .rlap>.katex-inner{left:0}.katex .clap>.katex-inner>span{margin-left:-50%;margin-right:50%}.katex .katex-rule{border:0 solid;display:inline-block;position:relative}.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-underline .underline-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .katex-hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.katex-root{margin-left:.2777777778em;margin-right:-.5555555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .katex-sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .katex-sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .katex-sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .katex-sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .katex-sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .katex-sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .katex-sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .katex-sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .katex-sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .katex-sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .katex-sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .katex-sizing.reset-size2.size1{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .katex-sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .katex-sizing.reset-size2.size3{font-size:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .katex-sizing.reset-size2.size4{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .katex-sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .katex-sizing.reset-size2.size6{font-size:1.6666666667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .katex-sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .katex-sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .katex-sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .katex-sizing.reset-size2.size10{font-size:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .katex-sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .katex-sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .katex-sizing.reset-size3.size2{font-size:.8571428571em}.katex .fontsize-ensurer.reset-size3.size3,.katex .katex-sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .katex-sizing.reset-size3.size4{font-size:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .katex-sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .katex-sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .katex-sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .katex-sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .katex-sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .katex-sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .katex-sizing.reset-size3.size11{font-size:3.5542857143em}.katex .fontsize-ensurer.reset-size4.size1,.katex .katex-sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .katex-sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .katex-sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .katex-sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .katex-sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .katex-sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .katex-sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .katex-sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .katex-sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .katex-sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .katex-sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .katex-sizing.reset-size5.size1{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .katex-sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .katex-sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .katex-sizing.reset-size5.size4{font-size:.8888888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .katex-sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .katex-sizing.reset-size5.size6{font-size:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .katex-sizing.reset-size5.size7{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .katex-sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .katex-sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .katex-sizing.reset-size5.size10{font-size:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .katex-sizing.reset-size5.size11{font-size:2.7644444444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .katex-sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .katex-sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .katex-sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .katex-sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .katex-sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .katex-sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .katex-sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .katex-sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .katex-sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .katex-sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .katex-sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .katex-sizing.reset-size7.size1{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .katex-sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .katex-sizing.reset-size7.size3{font-size:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .katex-sizing.reset-size7.size4{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .katex-sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .katex-sizing.reset-size7.size6{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .katex-sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .katex-sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .katex-sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .katex-sizing.reset-size7.size10{font-size:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .katex-sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .katex-sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .katex-sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .katex-sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .katex-sizing.reset-size8.size4{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .katex-sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .katex-sizing.reset-size8.size6{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .katex-sizing.reset-size8.size7{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .katex-sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .katex-sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .katex-sizing.reset-size8.size10{font-size:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .katex-sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .katex-sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .katex-sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .katex-sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .katex-sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .katex-sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .katex-sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .katex-sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .katex-sizing.reset-size9.size8{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .katex-sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .katex-sizing.reset-size9.size10{font-size:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .katex-sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .katex-sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .katex-sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .katex-sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .katex-sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .katex-sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .katex-sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .katex-sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .katex-sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .katex-sizing.reset-size10.size9{font-size:.8331726133em}.katex .fontsize-ensurer.reset-size10.size10,.katex .katex-sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .katex-sizing.reset-size10.size11{font-size:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .katex-sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .katex-sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .katex-sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .katex-sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .katex-sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .katex-sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .katex-sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .katex-sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .katex-sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .katex-sizing.reset-size11.size10{font-size:.8336012862em}.katex .fontsize-ensurer.reset-size11.size11,.katex .katex-sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{display:inline-block;width:.12em}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .katex-accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .katex-accent .accent-body{position:relative}.katex .katex-accent .accent-body:not(.accent-full){width:0}.katex .katex-overlay{display:block}.katex .mtable .vertical-separator{display:inline-block;min-width:1px}.katex .mtable .arraycolsep{display:inline-block}.katex .mtable .col-align-c>.vlist-t{text-align:center}.katex .mtable .col-align-l>.vlist-t{text-align:left}.katex .mtable .col-align-r>.vlist-t{text-align:right}.katex .svg-align{text-align:left}.katex svg{fill:currentColor;stroke:currentColor;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;max-height:none;max-width:none;min-height:0;min-width:0}.katex .katex-stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .katex-stretchy:after,.katex .katex-stretchy:before{content:""}.katex .hide-tail{overflow:hidden;position:relative;width:100%}.katex .halfarrow-left{left:0;overflow:hidden;position:absolute;width:50.2%}.katex .halfarrow-right{overflow:hidden;position:absolute;right:0;width:50.2%}.katex .brace-left{left:0;overflow:hidden;position:absolute;width:25.1%}.katex .brace-center{left:25%;overflow:hidden;position:absolute;width:50%}.katex .brace-right{overflow:hidden;position:absolute;right:0;width:25.1%}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{border:.04em solid;box-sizing:border-box}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .katex-sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{border-right:.049em solid;border-top:.049em solid;box-sizing:border-box;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .reflectbox{display:inline-block;transform:scaleX(-1)}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.katex-tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.katex-tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}:root{--blue-500: #3b82f6;--blue-600: #2563eb;--blue-700: #1d4ed8;--blue-400: #60a5fa;--blue-300: #93c5fd;--blue-100: #dbeafe;--blue-50: #eff6ff;--indigo-500: #6366f1;--bg: #f8fafc;--surface: #ffffff;--surface-2: #f1f5f9;--text-1: #172033;--text-2: #64748b;--text-3: #94a3b8;--border: #e2e8f0;--border-strong: #cbd5e1;--success: #10b981;--danger: #ef4444;--gradient-cta: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);--gradient-cta-hover: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);--glow-soft: 0 0 44px rgba(59, 130, 246, .16);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-md: 1.125rem;--text-lg: 1.25rem;--text-xl: clamp(1.35rem, 1.2rem + .6vw, 1.6rem);--text-2xl: clamp(1.6rem, 1.35rem + 1vw, 2.1rem);--text-3xl: clamp(2rem, 1.6rem + 1.7vw, 2.9rem);--text-hero: clamp(2.5rem, 1.7rem + 3.6vw, 4.35rem);--leading-tight: 1.12;--leading-snug: 1.35;--leading-body: 1.65;--tracking-tight: -.022em;--tracking-tighter: -.032em;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.5rem;--space-6: 2rem;--space-7: 3rem;--space-8: 4rem;--space-9: 6rem;--section-pad: clamp(4rem, 3rem + 5vw, 7rem);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 24px;--radius-full: 999px;--shadow-xs: 0 1px 2px rgba(23, 32, 51, .05);--shadow-sm: 0 1px 3px rgba(23, 32, 51, .06), 0 1px 2px rgba(23, 32, 51, .04);--shadow-md: 0 6px 20px -4px rgba(23, 32, 51, .1), 0 2px 6px -2px rgba(23, 32, 51, .05);--shadow-lg: 0 18px 44px -12px rgba(23, 32, 51, .16), 0 4px 12px -6px rgba(23, 32, 51, .06);--shadow-window: 0 24px 60px -18px rgba(37, 99, 235, .18), 0 8px 22px -12px rgba(23, 32, 51, .12);--ease-out: cubic-bezier(.22, 1, .36, 1);--dur-fast: .15s;--dur-med: .3s;--dur-slow: .6s;--container: 1140px;--container-narrow: 780px;--nav-height: 68px}*,*:before,*:after{box-sizing:border-box}*{margin:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:var(--leading-body);color:var(--text-1);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img,picture,svg,video{display:block;max-width:100%}img{height:auto}input,button,textarea,select{font:inherit;color:inherit}button{cursor:pointer;background:none;border:none;padding:0}a{color:var(--blue-600);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:3px}h1,h2,h3,h4{line-height:var(--leading-tight);font-weight:700;letter-spacing:var(--tracking-tight);overflow-wrap:break-word}p{overflow-wrap:break-word}::selection{background:var(--blue-100);color:var(--blue-700)}:focus-visible{outline:2px solid var(--blue-500);outline-offset:3px;border-radius:4px}.skip-link{position:fixed;top:10px;left:10px;z-index:200;background:var(--blue-600);color:#fff;font-weight:600;font-size:var(--text-sm);padding:.6em 1.1em;border-radius:var(--radius-full);transform:translateY(-64px);opacity:0;transition:transform var(--dur-fast) var(--ease-out),opacity var(--dur-fast) var(--ease-out)}.skip-link:focus-visible{transform:none;opacity:1;text-decoration:none}.container{width:min(100% - 2.5rem,var(--container));margin-inline:auto}.container--narrow{width:min(100% - 2.5rem,var(--container-narrow));margin-inline:auto}.section{padding-block:var(--section-pad);scroll-margin-top:calc(var(--nav-height) + 12px)}.section--surface{background:var(--surface);border-block:1px solid var(--border)}.section-head{max-width:640px;margin-bottom:var(--space-7)}.section-head--center{margin-inline:auto;text-align:center}.section-head .eyebrow{display:inline-flex;align-items:center;gap:.45em;font-size:var(--text-sm);font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--blue-600);background:var(--blue-50);border:1px solid var(--blue-100);border-radius:var(--radius-full);padding:.3em .9em;margin-bottom:var(--space-4)}.section-head h2{font-size:var(--text-3xl);letter-spacing:var(--tracking-tighter);color:var(--text-1)}.section-head .section-sub{margin-top:var(--space-4);font-size:var(--text-md);color:var(--text-2)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55em;font-weight:600;font-size:var(--text-base);line-height:1;border-radius:var(--radius-full);padding:.85em 1.6em;border:1px solid transparent;transition:background var(--dur-fast) var(--ease-out),color var(--dur-fast) var(--ease-out),border-color var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out),transform var(--dur-fast) var(--ease-out);user-select:none;white-space:nowrap}.btn--primary{background:var(--gradient-cta);color:#fff;box-shadow:0 8px 20px -6px #3b82f673}.btn--primary:hover{background:var(--gradient-cta-hover);box-shadow:0 10px 26px -6px #3b82f68c;text-decoration:none}.btn--secondary{background:var(--surface);color:var(--text-1);border-color:var(--border-strong);box-shadow:var(--shadow-xs)}.btn--secondary:hover{border-color:var(--blue-400);color:var(--blue-600);text-decoration:none}.btn--ghost{color:var(--text-1);padding:.85em 1.1em}.btn--ghost:hover{color:var(--blue-600);text-decoration:none}.btn--sm{font-size:var(--text-sm);padding:.65em 1.15em}.btn--lg{font-size:var(--text-md);padding:1em 1.9em}.btn[disabled],.btn[aria-disabled=true]{opacity:.55;cursor:not-allowed;transform:none}.reveal{opacity:0;transform:translateY(18px);transition:opacity var(--dur-slow) var(--ease-out),transform var(--dur-slow) var(--ease-out);transition-delay:var(--reveal-delay, 0ms);will-change:opacity,transform}.reveal.is-visible{opacity:1;transform:none}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}.reveal{opacity:1;transform:none}}.nav{position:fixed;inset-inline:0;top:0;z-index:100;height:var(--nav-height);background:#f8fafcd1;-webkit-backdrop-filter:saturate(180%) blur(14px);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:border-color var(--dur-med) var(--ease-out),box-shadow var(--dur-med) var(--ease-out)}.nav.is-scrolled{border-bottom-color:var(--border);box-shadow:0 1px 12px #1720330a}.nav__inner{height:100%;display:flex;align-items:center;gap:var(--space-5)}.nav__brand{display:inline-flex;align-items:center;gap:.6rem;font-weight:700;font-size:var(--text-md);letter-spacing:var(--tracking-tight);color:var(--text-1)}.nav__brand:hover{text-decoration:none}.nav__brand img{width:34px;height:34px;border-radius:9px}.nav__links{display:flex;align-items:center;gap:.25rem;margin-inline:auto}.nav__link{display:inline-block;padding:.55em .95em;border-radius:var(--radius-full);color:var(--text-2);font-weight:500;font-size:var(--text-base);transition:color var(--dur-fast) var(--ease-out),background var(--dur-fast) var(--ease-out)}.nav__link:hover{color:var(--text-1);background:var(--surface-2);text-decoration:none}.nav__link.is-active{color:var(--blue-600);background:var(--blue-50)}.nav__actions{display:flex;align-items:center;gap:.5rem;margin-left:auto}.lang-toggle{border:1px solid var(--border);background:var(--surface);cursor:pointer;user-select:none}.lang-toggle:hover{color:var(--blue-600);border-color:var(--blue-400)}.lang-toggle--drawer{justify-content:center;border:1px solid var(--border);border-radius:var(--radius-md);padding:.7em}.nav__toggle{display:none;width:42px;height:42px;border-radius:var(--radius-sm);color:var(--text-1);align-items:center;justify-content:center}.nav__toggle:hover{background:var(--surface-2)}.nav__drawer{display:none}@media(max-width:880px){.nav__links,.nav__actions{display:none}.nav__toggle{display:inline-flex;margin-left:auto}.nav__drawer{display:block;position:fixed;top:var(--nav-height);inset-inline:0;bottom:0;z-index:95;background:#f8fafcfa;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);padding:var(--space-5) 1.25rem var(--space-7);overflow-y:auto;opacity:0;transform:translateY(-6px);pointer-events:none;transition:opacity var(--dur-med) var(--ease-out),transform var(--dur-med) var(--ease-out)}.nav__drawer.is-open{opacity:1;transform:none;pointer-events:auto}.nav__drawer a{display:flex;align-items:center;justify-content:space-between;padding:1rem .35rem;font-size:var(--text-lg);font-weight:600;color:var(--text-1);border-bottom:1px solid var(--border)}.nav__drawer a:hover{text-decoration:none;color:var(--blue-600)}.nav__drawer-cta{margin-top:var(--space-6);display:grid;gap:var(--space-3)}.nav__drawer-cta .btn{width:100%}}.footer{background:var(--surface);border-top:1px solid var(--border);padding-block:var(--space-8) var(--space-6);margin-top:0}.footer__grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:var(--space-7)}.footer__brand p{margin-top:var(--space-4);color:var(--text-2);font-size:var(--text-sm);max-width:30ch}.footer__col h3{font-size:var(--text-sm);font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--text-3);margin-bottom:var(--space-4)}.footer__col ul{list-style:none;padding:0;display:grid;gap:.65rem}.footer__col a{color:var(--text-2);font-size:var(--text-sm)}.footer__col a:hover{color:var(--blue-600)}.footer__bottom{margin-top:var(--space-7);padding-top:var(--space-5);border-top:1px solid var(--border);display:flex;flex-wrap:wrap;gap:var(--space-3);align-items:center;justify-content:space-between;color:var(--text-3);font-size:var(--text-sm)}@media(max-width:760px){.footer__grid{grid-template-columns:1fr 1fr}.footer__brand{grid-column:1 / -1}}.cat-figure{position:relative;display:grid;place-items:center}.cat-figure img{width:100%;height:auto}.cat-figure:before{content:"";position:absolute;inset:12%;border-radius:50%;background:radial-gradient(closest-side,#3b82f62e,#3b82f600 72%);z-index:0}.cat-figure--float img{position:relative;z-index:1;animation:cat-float 7s ease-in-out infinite}@keyframes cat-float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@media(prefers-reduced-motion:reduce){.cat-figure--float img{animation:none}}.window{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-window);overflow:hidden}.window__bar{display:flex;align-items:center;gap:.6rem;padding:.8rem 1.1rem;background:var(--surface-2);border-bottom:1px solid var(--border)}.window__dots{display:inline-flex;gap:6px}.window__dots i{width:10px;height:10px;border-radius:50%;background:var(--border-strong)}.window__title{font-size:var(--text-sm);font-weight:600;color:var(--text-2);margin-inline:auto;display:inline-flex;align-items:center;gap:.5em}.window__body{padding:clamp(1.1rem,2.5vw,1.8rem)}.hero{padding-top:calc(var(--nav-height) + clamp(3rem,2rem + 5vw,5.5rem));padding-bottom:var(--section-pad);position:relative;overflow:hidden}.hero:before{content:"";position:absolute;inset:0 0 auto;height:520px;background:linear-gradient(180deg,var(--blue-50) 0%,rgba(239,246,255,0) 100%);pointer-events:none}.hero__grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,1rem + 4vw,4.5rem);align-items:center}.hero__badge{display:inline-flex;align-items:center;gap:.5em;font-size:var(--text-sm);font-weight:600;color:var(--blue-600);background:var(--surface);border:1px solid var(--blue-100);border-radius:var(--radius-full);padding:.4em 1em;margin-bottom:var(--space-5);box-shadow:var(--shadow-xs)}.hero__badge .dot{width:7px;height:7px;border-radius:50%;background:var(--blue-500);animation:pulse-dot 2.4s ease-in-out infinite}@keyframes pulse-dot{0%,to{box-shadow:0 0 #3b82f659}50%{box-shadow:0 0 0 5px #3b82f600}}.hero__title{font-size:clamp(2.5rem,1.6rem + 3.3vw,4rem);letter-spacing:var(--tracking-tighter);font-weight:800;text-wrap:balance}.hero__title em{font-style:normal;color:var(--blue-600)}.hero__sub{margin-top:var(--space-5);font-size:clamp(1.05rem,1rem + .5vw,1.3rem);color:var(--text-2);max-width:34ch}.hero__cta{margin-top:var(--space-6);display:flex;flex-wrap:wrap;gap:var(--space-3)}.hero__hint{margin-top:var(--space-5);font-size:var(--text-sm);color:var(--text-3);display:flex;align-items:center;gap:.5em}.hero__cat{min-width:0}.hero__cat .cat-figure{max-width:470px;margin-inline:auto}@media(max-width:900px){.hero__grid{grid-template-columns:1fr}.hero__cat{order:-1}.hero__cat .cat-figure{max-width:300px}.hero__copy{text-align:center}.hero__sub{margin-inline:auto}.hero__cta,.hero__hint{justify-content:center}}.features__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-4)}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-5);transition:transform var(--dur-med) var(--ease-out),box-shadow var(--dur-med) var(--ease-out),border-color var(--dur-med) var(--ease-out)}.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--blue-100)}.feature-card__icon{width:44px;height:44px;border-radius:var(--radius-md);background:var(--blue-50);color:var(--blue-600);display:grid;place-items:center;margin-bottom:var(--space-4)}.feature-card__icon svg{width:22px;height:22px}.feature-card h3{font-size:var(--text-lg);margin-bottom:.4rem}.feature-card .feature-kicker{display:block;font-size:var(--text-xs);font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--blue-600);margin-bottom:.55rem}.feature-card p{font-size:var(--text-sm);color:var(--text-2)}@media(max-width:960px){.features__grid{grid-template-columns:1fr 1fr}}@media(max-width:540px){.features__grid{grid-template-columns:1fr}}.showcase{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(2rem,1rem + 4vw,4.5rem);align-items:center}.showcase--flip .showcase__copy{order:2}.showcase__copy h2{font-size:var(--text-2xl);letter-spacing:var(--tracking-tighter)}.showcase__copy .showcase-sub{margin-top:var(--space-4);color:var(--text-2);font-size:var(--text-md)}.showcase__copy .showcase-points{margin-top:var(--space-5);display:grid;gap:.8rem;list-style:none;padding:0}.showcase__copy .showcase-points li{display:flex;gap:.65em;align-items:flex-start;color:var(--text-2);font-size:var(--text-base)}.showcase__copy .showcase-points svg{flex:none;width:20px;height:20px;color:var(--blue-500);margin-top:.15em}.showcase__media{min-width:0}@media(max-width:900px){.showcase{grid-template-columns:1fr}.showcase--flip .showcase__copy{order:0}}.live-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:var(--space-4)}.live-head__course{font-weight:700;font-size:var(--text-base)}.live-head__course span{color:var(--text-3);font-weight:500}.live-badge{display:inline-flex;align-items:center;gap:.5em;font-size:var(--text-xs);font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--blue-600);background:var(--blue-50);border:1px solid var(--blue-100);padding:.35em .8em;border-radius:var(--radius-full)}.live-badge i{width:7px;height:7px;border-radius:50%;background:var(--blue-500);animation:pulse-dot 1.8s ease-in-out infinite}.transcript{display:grid;gap:.7rem}.transcript__line{display:flex;gap:.7rem;align-items:baseline;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);padding:.65rem .9rem;font-size:var(--text-sm)}.transcript__line .who{flex:none;font-size:.65rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--text-3);width:76px}.transcript__line.is-latest{border-color:var(--blue-100);background:var(--blue-50)}.transcript__caret{display:inline-block;width:2px;height:1em;background:var(--blue-500);vertical-align:text-bottom;margin-left:2px;animation:caret-blink 1.1s steps(1) infinite}@keyframes caret-blink{50%{opacity:0}}.cat-inline{display:flex;align-items:center;gap:.8rem;margin-top:var(--space-4);padding:.7rem .9rem;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--surface)}.cat-inline img{width:44px;height:44px;flex:none}.cat-inline .cat-inline__text strong{display:block;font-size:var(--text-sm)}.cat-inline .cat-inline__text span{font-size:var(--text-xs);color:var(--text-2);display:inline-flex;align-items:center;gap:.4em}.eq{display:inline-flex;align-items:flex-end;gap:2px;height:12px}.eq i{width:3px;border-radius:2px;background:var(--blue-500);animation:eq-bounce 1s ease-in-out infinite}.eq i:nth-child(1){height:6px;animation-delay:0s}.eq i:nth-child(2){height:11px;animation-delay:.18s}.eq i:nth-child(3){height:8px;animation-delay:.36s}@keyframes eq-bounce{0%,to{transform:scaleY(.5)}50%{transform:scaleY(1)}}.companion-side{margin-top:var(--space-4);border-top:1px dashed var(--border);padding-top:var(--space-4);display:grid;gap:.8rem}.mini-note{border:1px solid var(--border);background:var(--bg);border-radius:var(--radius-md);padding:.7rem .9rem}.mini-note__tag{display:inline-flex;align-items:center;gap:.4em;font-size:var(--text-xs);font-weight:600;color:var(--blue-600);margin-bottom:.35rem}.mini-note__tag svg{width:13px;height:13px}.mini-note p{font-size:var(--text-sm);color:var(--text-2)}.mini-note p strong{color:var(--text-1)}.chat{display:grid;gap:var(--space-4)}.bubble{display:flex;gap:.75rem;max-width:92%}.bubble--user{margin-left:auto;flex-direction:row-reverse}.bubble__avatar{flex:none;width:36px;height:36px;border-radius:50%;overflow:hidden;background:var(--blue-50)}.bubble__avatar img{width:100%;height:100%;object-fit:cover}.bubble__avatar--user{display:grid;place-items:center;font-size:var(--text-xs);font-weight:700;color:var(--blue-600);border:1px solid var(--blue-100)}.bubble__body{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:.75rem 1rem;font-size:var(--text-base);box-shadow:var(--shadow-xs)}.bubble--user .bubble__body{background:var(--blue-600);color:#fff;border-color:var(--blue-600);border-bottom-right-radius:6px}.bubble--cat .bubble__body{border-bottom-left-radius:6px}.bubble__body .bubble__name{display:block;font-size:var(--text-xs);font-weight:600;color:var(--text-3);margin-bottom:.3rem}.bubble__body code{font-family:var(--font-mono);font-size:.9em;background:var(--blue-50);color:var(--blue-700);border-radius:5px;padding:.1em .35em}.chat-input{display:flex;align-items:center;gap:.6rem;border:1px solid var(--border);border-radius:var(--radius-full);padding:.55rem .65rem .55rem 1.1rem;color:var(--text-3);font-size:var(--text-sm);background:var(--surface)}.chat-input .send{margin-left:auto;width:34px;height:34px;flex:none;border-radius:50%;background:var(--gradient-cta);color:#fff;display:grid;place-items:center}.chat-input .send svg{width:16px;height:16px}.note-doc h3{font-size:var(--text-lg);display:flex;align-items:center;gap:.6em}.note-doc h3 .doc-tag{font-size:var(--text-xs);font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--text-3);border:1px solid var(--border);padding:.25em .7em;border-radius:var(--radius-full)}.note-doc ol{margin:var(--space-4) 0 0;padding:0;list-style:none;counter-reset:note-item;display:grid;gap:.55rem}.note-doc ol li{counter-increment:note-item;display:flex;align-items:baseline;gap:.75em;font-size:var(--text-base);color:var(--text-1)}.note-doc ol li:before{content:counter(note-item,decimal-leading-zero);font-family:var(--font-mono);font-size:var(--text-xs);color:var(--blue-500);flex:none}.key-idea{margin-top:var(--space-5);border-left:3px solid var(--blue-500);background:var(--blue-50);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:.9rem 1.1rem}.key-idea .key-idea__tag{font-size:var(--text-xs);font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--blue-600);display:block;margin-bottom:.3rem}.key-idea p{font-size:var(--text-sm);color:var(--text-1)}.key-idea code{font-family:var(--font-mono);font-size:.9em;background:#ffffffbf;border-radius:5px;padding:.1em .35em;color:var(--blue-700)}.practice-card{max-width:560px}.practice-card .q-num{font-family:var(--font-mono);font-size:var(--text-xs);font-weight:600;letter-spacing:.08em;color:var(--blue-600);text-transform:uppercase}.practice-card .q-label{margin-top:.5rem;font-size:var(--text-sm);color:var(--text-3)}.math{margin-top:var(--space-3);display:inline-flex;align-items:center;gap:.6em;font-family:var(--font-mono);font-size:var(--text-lg)}.math .frac{display:inline-flex;flex-direction:column;align-items:center;font-size:var(--text-base);line-height:1.3}.math .frac span:first-child{padding:0 .4em .12em;border-bottom:1.5px solid var(--text-1)}.math .frac span:last-child{padding-top:.12em}.math .lim{display:inline-flex;flex-direction:column;align-items:center;line-height:1.1}.math .lim small{font-size:.62em;color:var(--text-2)}.options{margin-top:var(--space-4);display:grid;gap:.55rem}.option{display:flex;align-items:center;gap:.75em;border:1px solid var(--border);border-radius:var(--radius-md);padding:.6rem .9rem;font-size:var(--text-base);background:var(--surface)}.option .radio{flex:none;width:18px;height:18px;border-radius:50%;border:2px solid var(--border-strong)}.option.is-selected{border-color:var(--blue-500);background:var(--blue-50)}.option.is-selected .radio{border-color:var(--blue-600);background:radial-gradient(circle,var(--blue-600) 0 42%,transparent 46%)}.option .mark{margin-left:auto;color:var(--success);display:inline-flex}.option .mark svg{width:17px;height:17px}.flow{display:flex;align-items:stretch;justify-content:center;gap:0;flex-wrap:nowrap}.flow__step{display:grid;gap:.55rem;justify-items:center;text-align:center;flex:1;min-width:0;position:relative}.flow__dot{width:46px;height:46px;border-radius:50%;background:var(--surface);border:1.5px solid var(--blue-100);color:var(--blue-600);display:grid;place-items:center;box-shadow:var(--shadow-sm);z-index:1}.flow__dot svg{width:20px;height:20px}.flow__name{font-size:var(--text-xs);font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--text-1)}.flow__desc{font-size:var(--text-xs);color:var(--text-3);max-width:14ch}.flow__step:before{content:"";position:absolute;top:23px;right:calc(50% + 30px);left:calc(-50% + 30px);height:1.5px;background:linear-gradient(90deg,var(--blue-100),var(--blue-300))}.flow__step:first-child:before{display:none}.flow__cat{flex:none;align-self:center;margin-left:clamp(.5rem,2vw,1.5rem)}.flow__cat .cat-figure{width:clamp(64px,8vw,92px)}@media(max-width:860px){.flow{flex-direction:column;align-items:flex-start;gap:0;max-width:400px;margin-inline:auto}.flow__step{grid-template-columns:46px 1fr;align-items:center;justify-items:start;text-align:left;gap:0 var(--space-4);padding-block:.55rem}.flow__name,.flow__desc{grid-column:2}.flow__step:before{inset:50px auto -14px 22px;width:1.5px;height:auto;background:linear-gradient(180deg,var(--blue-100),var(--blue-300))}.flow__cat{margin:var(--space-4) 0 0 0;align-self:center}}.meet{background:var(--blue-50);border-block:1px solid var(--blue-100)}.meet__grid{display:grid;grid-template-columns:repeat(5,1fr);gap:var(--space-4)}.meet-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-4);text-align:center;transition:transform var(--dur-med) var(--ease-out),box-shadow var(--dur-med) var(--ease-out)}.meet-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.meet-card img{width:100%;max-width:150px;margin-inline:auto}.meet-card__state{display:inline-flex;align-items:center;gap:.45em;font-size:var(--text-xs);font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--blue-600);margin-top:var(--space-3)}.meet-card__state i{width:6px;height:6px;border-radius:50%;background:var(--blue-500)}.meet-card p{margin-top:.45rem;font-size:var(--text-sm);color:var(--text-2)}@media(max-width:1020px){.meet__grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:640px){.meet__grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:420px){.meet__grid{grid-template-columns:1fr}}.download-cta{background:linear-gradient(150deg,#1e3a8a -10%,#2563eb 55%,#4f46e5 110%);border-radius:var(--radius-xl);color:#fff;padding:clamp(2.2rem,1.5rem + 4vw,4.5rem);text-align:center;position:relative;overflow:hidden}.download-cta:after{content:"";position:absolute;right:-140px;bottom:-180px;width:420px;height:420px;border-radius:50%;background:radial-gradient(closest-side,rgba(255,255,255,.14),transparent);pointer-events:none}.download-cta h2{font-size:var(--text-2xl);letter-spacing:var(--tracking-tighter)}.download-cta p{margin:var(--space-4) auto 0;max-width:46ch;color:#ffffffd1;font-size:var(--text-md)}.download-cta__btns{margin-top:var(--space-6);display:flex;flex-wrap:wrap;gap:var(--space-3);justify-content:center}.btn--inverse{background:#fff;color:var(--blue-700)}.btn--inverse:hover{background:var(--blue-50);text-decoration:none}.btn--outline-inverse{border-color:#ffffff8c;color:#fff}.btn--outline-inverse:hover{border-color:#fff;background:#ffffff1a;text-decoration:none}.online-dl{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:clamp(1.4rem,1rem + 2.5vw,2.4rem);max-width:720px;margin-inline:auto;text-align:left}.online-dl__badge{display:inline-flex;align-items:center;gap:.5em;font-size:var(--text-xs);font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--success);background:#10b98114;border:1px solid rgba(16,185,129,.25);border-radius:var(--radius-full);padding:.35em .9em}.online-dl__badge i{width:7px;height:7px;border-radius:50%;background:var(--success);animation:pulse-dot 2s ease-in-out infinite}.online-dl__head h2{margin-top:var(--space-4);font-size:var(--text-xl);letter-spacing:var(--tracking-tight)}.online-dl__head p{margin-top:.5rem;color:var(--text-2);font-size:var(--text-sm)}.online-dl__meta{margin-top:var(--space-4);color:var(--text-2);font-size:var(--text-sm);display:flex;align-items:center;gap:.6em}.online-dl__meta .spin{width:16px;height:16px;flex:none;border-radius:50%;border:2px solid var(--blue-100);border-top-color:var(--blue-500);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.online-dl__row{margin-top:var(--space-5);display:flex;align-items:center;gap:var(--space-5);flex-wrap:wrap}.online-dl__facts{display:flex;gap:var(--space-5);flex-wrap:wrap;margin:0;flex:1;min-width:0}.online-dl__facts dt{font-size:var(--text-xs);font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--text-3)}.online-dl__facts dd{margin:.2rem 0 0;font-weight:600;font-size:var(--text-base)}.online-dl__facts .muted{color:var(--text-3);font-weight:500;font-size:var(--text-sm)}.online-dl__facts .online-dl__sha dd{font-family:var(--font-mono);font-size:var(--text-sm);font-weight:500}.online-dl__btn{flex:none;min-width:240px}.online-dl__progress{margin-top:var(--space-4);height:8px;border-radius:var(--radius-full);background:var(--surface-2);overflow:hidden}.online-dl__progress-bar{height:100%;border-radius:var(--radius-full);background:var(--gradient-cta);transition:width .18s linear}.online-dl__notes{margin-top:var(--space-5);border-top:1px dashed var(--border);padding-top:var(--space-4)}.online-dl__notes h3{font-size:var(--text-sm);font-weight:600;color:var(--text-1);margin-bottom:.6rem}.online-dl__notes ul{list-style:none;padding:0;display:grid;gap:.4rem}.online-dl__notes li{display:flex;align-items:baseline;gap:.5em;font-size:var(--text-sm);color:var(--text-2)}.online-dl__notes li svg{flex:none;color:var(--success);transform:translateY(2px)}.online-dl__notice{margin-top:var(--space-4);font-size:var(--text-sm);border-radius:var(--radius-md);padding:.7rem 1rem}.online-dl__notice.is-limit{background:#fff7ed;color:#9a3412;border:1px solid #fed7aa}.online-dl__notice.is-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}.online-dl__notice.is-ok{background:var(--blue-50);color:var(--blue-700);border:1px solid var(--blue-100)}@media(prefers-reduced-motion:reduce){.online-dl__meta .spin{animation-duration:1.6s}}.dl-hero{text-align:center;padding-top:calc(var(--nav-height) + var(--section-pad) / 1.5)}.dl-hero .cat-figure{width:min(240px,55vw);margin:var(--space-6) auto 0}.dl-platforms{margin-top:var(--space-7);display:grid;grid-template-columns:1fr 1fr;gap:var(--space-4);max-width:720px;margin-inline:auto}.dl-platform{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-5);text-align:left;display:flex;flex-direction:column;gap:var(--space-4)}.dl-platform__head{display:flex;align-items:center;gap:.8rem}.dl-platform__head svg{width:28px;height:28px;color:var(--text-1)}.dl-platform__head h3{font-size:var(--text-lg)}.dl-platform__head small{display:block;font-size:var(--text-xs);font-weight:500;color:var(--text-3)}.dl-platform p{font-size:var(--text-sm);color:var(--text-2);flex:1}@media(max-width:640px){.dl-platforms{grid-template-columns:1fr}}.prose-page{padding-top:calc(var(--nav-height) + clamp(2.5rem,2rem + 3vw,4rem));padding-bottom:var(--section-pad)}.prose-page__head{margin-bottom:var(--space-6)}.prose-page__head h1{font-size:var(--text-2xl);letter-spacing:var(--tracking-tighter)}.prose-page__head .updated{margin-top:.75rem;font-size:var(--text-sm);color:var(--text-3)}.prose{color:var(--text-1)}.prose h2{font-size:var(--text-xl);margin:var(--space-6) 0 var(--space-3);letter-spacing:var(--tracking-tight)}.prose h3{font-size:var(--text-lg);margin:var(--space-5) 0 var(--space-2)}.prose p,.prose ul,.prose ol{color:var(--text-2);font-size:var(--text-base)}.prose ul,.prose ol{padding-left:1.4em;display:grid;gap:.5rem}.prose strong{color:var(--text-1)}.prose a{color:var(--blue-600)}.prose address{font-style:normal;color:var(--text-2)}.feature-row{display:grid;grid-template-columns:48px 1fr;gap:var(--space-4);padding-block:var(--space-5);border-top:1px solid var(--border)}.feature-row__icon{width:48px;height:48px;border-radius:var(--radius-md);background:var(--blue-50);color:var(--blue-600);display:grid;place-items:center}.feature-row__icon svg{width:24px;height:24px}.feature-row h3{font-size:var(--text-lg)}.feature-row h3 span{color:var(--text-3);font-weight:500}.feature-row p{margin-top:.4rem;color:var(--text-2)}.app-shell{min-height:100vh;display:flex;flex-direction:column;background:var(--bg)}.app-topbar{height:var(--nav-height);display:flex;align-items:center;gap:var(--space-4);padding-inline:clamp(1rem,3vw,2rem);background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}.app-topbar__brand{display:inline-flex;align-items:center;gap:.6rem;font-weight:700;color:var(--text-1);font-size:var(--text-md)}.app-topbar__brand img{width:30px;height:30px;border-radius:8px}.app-topbar__spacer{flex:1}.app-topbar .back-link{font-size:var(--text-sm);font-weight:600;color:var(--text-2)}.app-topbar .back-link:hover{color:var(--blue-600);text-decoration:none}.app-main{flex:1;display:grid;place-items:center;padding:var(--space-7) 1.25rem}.app-footer{padding:var(--space-5);text-align:center;font-size:var(--text-sm);color:var(--text-3)}.app-soon{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;max-width:520px;margin-inline:auto;padding:var(--space-7) 1.25rem;position:relative}.app-soon .cat-figure{width:min(200px,48vw);margin-inline:auto}.app-soon h1{margin-top:var(--space-5);font-size:var(--text-2xl);letter-spacing:var(--tracking-tighter)}.app-soon .app-soon__sub{margin-top:var(--space-3);color:var(--text-2);font-size:var(--text-md)}.app-soon .soon-pill{display:inline-flex;align-items:center;gap:.5em;margin-top:var(--space-5);font-size:var(--text-sm);font-weight:600;color:var(--blue-600);background:var(--blue-50);border:1px solid var(--blue-100);border-radius:var(--radius-full);padding:.45em 1.1em}.app-soon .soon-pill i{width:7px;height:7px;border-radius:50%;background:var(--blue-500);animation:pulse-dot 2.2s ease-in-out infinite}.app-soon__actions{margin-top:var(--space-6);display:flex;gap:var(--space-3);justify-content:center;flex-wrap:wrap}.login-lang{position:absolute;top:var(--space-4);right:var(--space-4)}.login-lang button{font-size:var(--text-sm);font-weight:600;color:var(--text-2);border:1px solid var(--border);border-radius:var(--radius-full);padding:.35em .95em;background:var(--surface)}.login-lang button:hover{color:var(--blue-600);border-color:var(--blue-400)}.login-page{min-height:100vh;display:grid;place-items:center;background:radial-gradient(720px 380px at 50% -60px,var(--blue-50),transparent),var(--bg);padding:var(--space-6) 1.25rem;position:relative}.login-card{width:min(420px,100%);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);padding:var(--space-7) var(--space-6);text-align:center;position:relative}.login-card .cat-figure{width:120px;margin:0 auto}.login-card h1{margin-top:var(--space-4);font-size:var(--text-xl);letter-spacing:var(--tracking-tight)}.login-card .login-sub{margin-top:var(--space-3);color:var(--text-2);font-size:var(--text-sm)}.login-card .mono{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--text-3);word-break:break-all}.login-btn{margin-top:var(--space-5);width:100%}.login-foot{margin-top:var(--space-5);font-size:var(--text-sm);color:var(--text-3);display:flex;gap:.4em;justify-content:center}.spin--lg{display:inline-block;width:28px;height:28px;border-radius:50%;border:3px solid var(--blue-100);border-top-color:var(--blue-500);animation:spin .8s linear infinite}.webapp{height:100vh;height:100dvh;display:grid;grid-template-columns:288px minmax(0,1fr) 312px;background:var(--bg)}@media(max-width:1180px){.webapp{grid-template-columns:288px minmax(0,1fr)}.webapp__right{display:none}}.webapp__right{background:var(--surface);border-left:1px solid var(--border);display:flex;flex-direction:column;min-height:0}.webapp__tabs{display:flex;border-bottom:1px solid var(--border);flex:none}.webapp__tabs button{flex:1;padding:.8rem .5rem;font-size:var(--text-sm);font-weight:600;color:var(--text-2);border-bottom:2px solid transparent}.webapp__tabs button:hover{color:var(--text-1)}.webapp__tabs button.is-active{color:var(--blue-600);border-bottom-color:var(--blue-500);background:var(--blue-50)}.webapp__right-body{flex:1;overflow-y:auto;padding:var(--space-4);min-height:0}.webapp__practice .webapp__quiz-btn{width:100%;border:1px solid var(--blue-100);background:var(--blue-50);color:var(--blue-700);font-weight:600;border-radius:var(--radius-md);padding:.7em 1em;transition:background var(--dur-fast) var(--ease-out)}.webapp__practice .webapp__quiz-btn:hover:not(:disabled){background:var(--blue-100)}.webapp__practice .webapp__quiz-btn:disabled{opacity:.55}.webapp__practice .webapp__hint{margin-top:var(--space-3);font-size:var(--text-xs);color:var(--text-3);line-height:1.6}.webapp__materials{display:grid;gap:var(--space-2)}.webapp__mat{display:flex;align-items:center;gap:.65rem;border:1px solid var(--border);border-radius:var(--radius-md);padding:.6rem .7rem;background:var(--surface)}.webapp__mat-icon{flex:none;width:32px;height:32px;border-radius:var(--radius-sm);background:var(--blue-50);color:var(--blue-600);display:grid;place-items:center}.webapp__mat-icon.is-audio{background:#10b9811a;color:var(--success)}.webapp__mat-body{min-width:0}.webapp__mat-body strong{display:block;font-size:var(--text-sm);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.webapp__mat-body small{font-size:var(--text-xs);color:var(--text-3)}.webapp__scrim{display:none}.webapp__sidebar{background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:var(--space-4) var(--space-3);min-height:0}.webapp__brand{display:flex;align-items:center;gap:.55rem;font-weight:700;padding:.25rem .5rem var(--space-4)}.webapp__brand img{width:30px;height:30px;border-radius:8px}.webapp__badge{font-size:.6rem;font-weight:700;letter-spacing:.08em;color:var(--blue-600);background:var(--blue-50);border:1px solid var(--blue-100);border-radius:var(--radius-full);padding:.2em .6em;margin-left:auto}.webapp__new{display:block;width:100%;border:1px solid var(--blue-100);background:var(--blue-50);color:var(--blue-700);font-weight:600;border-radius:var(--radius-md);padding:.65em 1em;text-align:left;transition:background var(--dur-fast) var(--ease-out)}.webapp__new:hover{background:var(--blue-100)}.webapp__list-label{font-size:var(--text-xs);font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--text-3);padding:var(--space-5) .5rem var(--space-2)}.webapp__list{flex:1;overflow-y:auto;display:grid;gap:2px;align-content:start;min-height:0}.webapp__empty{color:var(--text-3);font-size:var(--text-sm);padding:.35rem .5rem}.webapp__item{display:flex;align-items:center;border-radius:var(--radius-md);overflow:hidden}.webapp__item button{text-align:left;min-width:0}.webapp__item>button:first-child{flex:1;padding:.55rem .7rem;font-size:var(--text-sm);color:var(--text-1);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.webapp__item:hover{background:var(--surface-2)}.webapp__item.is-active{background:var(--blue-50)}.webapp__item.is-active>button:first-child{color:var(--blue-700);font-weight:600}.webapp__item-del{width:28px;height:28px;color:var(--text-3);border-radius:var(--radius-sm);opacity:1;flex:none}.webapp__item-del:hover{color:var(--danger);background:#ef444414}.webapp__mat-tools{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-2)}.webapp__tool-btn{border:1px solid var(--blue-100);background:var(--blue-50);color:var(--blue-700);font-weight:600;font-size:var(--text-sm);border-radius:var(--radius-md);padding:.55em .7em;transition:background var(--dur-fast) var(--ease-out)}.webapp__tool-btn:hover:not(:disabled){background:var(--blue-100)}.webapp__tool-btn:disabled{opacity:.55}.webapp__note-form{display:grid;gap:var(--space-2);border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-3);background:var(--surface)}.webapp__note-form input,.webapp__note-form textarea{width:100%;border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.5rem .7rem;font:inherit;font-size:var(--text-sm)}.webapp__note-form textarea{resize:vertical;min-height:90px}.webapp__note-form input:focus,.webapp__note-form textarea:focus{outline:none;border-color:var(--blue-400);box-shadow:0 0 0 3px var(--blue-100)}.webapp__note-form-actions{display:flex;gap:var(--space-2);align-items:center}.webapp__note-form-actions .webapp__quiz-btn{flex:none;padding:.5em 1.1em;font-size:var(--text-sm)}.webapp__note-form-actions button:last-child{font-size:var(--text-sm);color:var(--text-2)}.webapp__mat-actions{display:flex;flex-direction:column;gap:2px;flex:none}.webapp__mat-actions button{width:26px;height:26px;color:var(--text-3);border-radius:var(--radius-sm);font-size:.8rem;display:grid;place-items:center}.webapp__mat-actions button:hover{color:var(--blue-600);background:var(--blue-50)}.webapp__mat-actions .webapp__mat-del:hover{color:var(--danger);background:#ef444414}.webapp__chunks{margin-top:var(--space-2);border-top:1px dashed var(--border);padding-top:var(--space-2);display:grid;gap:var(--space-2);max-height:260px;overflow-y:auto}.webapp__chunks p{font-size:var(--text-xs);color:var(--text-2);line-height:1.55;white-space:pre-wrap}.webapp__chunks small{display:inline-block;margin-right:.5em;color:var(--blue-600);font-weight:700}.webapp__me-row{display:flex;align-items:center;gap:.55rem;padding:0 .35rem}.webapp__avatar{width:30px;height:30px;flex:none;border-radius:50%;background:var(--blue-600);color:#fff;font-size:var(--text-sm);font-weight:700;display:grid;place-items:center}.webapp__uname{font-size:var(--text-sm);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.webapp__points{margin-left:auto;flex:none;font-size:var(--text-xs);font-weight:700;color:var(--blue-600);background:var(--blue-50);border-radius:var(--radius-full);padding:.25em .7em;text-decoration:none;cursor:pointer}.webapp__points:hover{background:var(--blue-100);color:var(--blue-700)}.webapp__me-actions{display:flex;gap:var(--space-3);padding:var(--space-3) .35rem 0;font-size:var(--text-xs)}.webapp__me-actions button,.webapp__me-actions a{color:var(--text-2);font-weight:600}.webapp__me-actions button:hover,.webapp__me-actions a:hover{color:var(--blue-600);text-decoration:none}.webapp__me-actions .webapp__me-buy{color:var(--surface);background:var(--blue-600);border-radius:var(--radius-full);padding:.28em .8em;font-weight:700}.webapp__me-actions .webapp__me-buy:hover{background:var(--blue-700);color:var(--surface)}.webapp__sync-note{margin-top:var(--space-3);font-size:.68rem;color:var(--text-3);padding:0 .35rem}.webapp__main{display:flex;flex-direction:column;min-width:0;min-height:0}.webapp__topbar{display:flex;align-items:center;gap:var(--space-3);padding:.65rem clamp(1rem,3vw,1.6rem);background:var(--surface);border-bottom:1px solid var(--border)}.webapp__burger{display:none;font-size:1.15rem;color:var(--text-1);width:38px;height:38px;border-radius:var(--radius-sm)}.webapp__burger:hover{background:var(--surface-2)}.webapp__title{font-weight:700;font-size:var(--text-base);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.webapp__scroll{flex:1;overflow-y:auto;min-height:0}.webapp__thread{max-width:760px;margin-inline:auto;padding:var(--space-6) 1.25rem var(--space-6);display:grid;gap:var(--space-4)}.webapp__welcome{text-align:center;padding-top:var(--space-8)}.webapp__welcome .cat-figure{width:140px;margin-inline:auto}.webapp__welcome h2{margin-top:var(--space-4);font-size:var(--text-xl)}.webapp__welcome p{margin-top:var(--space-2);color:var(--text-2);font-size:var(--text-sm)}.webapp__loading,.webapp__thinking{color:var(--text-3);font-size:var(--text-sm)}.chatline{display:flex;gap:.7rem;align-items:flex-start}.chatline--user{justify-content:flex-end}.chatline--cat{justify-content:flex-start}.chatline__avatar{flex:none;border-radius:50%;background:var(--blue-50);margin-top:2px}.chatline__bubble{max-width:min(100%,600px);background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:.7rem 1rem;font-size:var(--text-base);line-height:1.6;box-shadow:var(--shadow-xs);overflow-wrap:anywhere}.chatline--user .chatline__bubble{background:var(--blue-600);color:#fff;border-color:var(--blue-600);border-bottom-right-radius:6px;white-space:pre-wrap}.chatline--cat .chatline__bubble{border-bottom-left-radius:6px}.chatline__bubble--md>:first-child{margin-top:0}.chatline__bubble--md>:last-child{margin-bottom:0}.chatline__bubble--md p{margin:.4em 0}.chatline__bubble--md pre{background:#0f172a;color:#e2e8f0;border-radius:var(--radius-md);padding:.8rem 1rem;overflow-x:auto;font-size:.85em;margin:.5em 0}.chatline__bubble--md code{font-family:var(--font-mono);font-size:.88em;background:var(--surface-2);border-radius:5px;padding:.12em .4em}.chatline__bubble--md pre code{background:none;padding:0}.chatline__bubble--md ul,.chatline__bubble--md ol{padding-left:1.4em;margin:.4em 0}.chatline__bubble--md table{border-collapse:collapse;margin:.5em 0;font-size:.9em}.chatline__bubble--md th,.chatline__bubble--md td{border:1px solid var(--border);padding:.35em .7em}.chatline__bubble--md .katex-display{overflow-x:auto;padding:.3em 0}.chatline__reasoning{margin-bottom:.5em;border-left:3px solid var(--blue-100);padding-left:.7em}.chatline__reasoning summary{font-size:var(--text-xs);font-weight:600;color:var(--text-3);cursor:pointer}.chatline__reasoning pre{font-size:.8em;color:var(--text-2);white-space:pre-wrap;max-height:220px;overflow-y:auto}.webapp__error{display:flex;align-items:center;gap:var(--space-3);font-size:var(--text-sm);color:#991b1b;background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius-md);padding:.6rem .9rem}.webapp__error.is-auth{color:#9a3412;background:#fff7ed;border-color:#fed7aa}.webapp__error button{margin-left:auto;flex:none;font-weight:700;color:inherit;text-decoration:underline;text-underline-offset:3px}.webapp__composer{display:flex;align-items:flex-end;gap:.6rem;padding:var(--space-4) clamp(1rem,3vw,1.6rem) var(--space-5);background:linear-gradient(180deg,rgba(248,250,252,0),var(--bg) 34%)}.webapp__composer textarea{flex:1;resize:none;max-height:160px;border:1px solid var(--border-strong);border-radius:14px;background:var(--surface);padding:.75rem 1rem;font:inherit;line-height:1.5;box-shadow:var(--shadow-sm)}.webapp__composer textarea:focus{outline:none;border-color:var(--blue-400);box-shadow:0 0 0 3px var(--blue-100)}.webapp__send{flex:none;width:44px;height:44px;border-radius:50%;background:var(--gradient-cta);color:#fff;font-size:1.05rem;display:grid;place-items:center;box-shadow:0 6px 16px -4px #3b82f680}.webapp__send:disabled{opacity:.5}.webapp__send:hover{background:var(--gradient-cta-hover)}@media(max-width:860px){.webapp{grid-template-columns:1fr}.webapp__burger{display:inline-grid;place-items:center}.webapp__sidebar{position:fixed;top:0;bottom:0;left:0;width:min(300px,84vw);z-index:90;transform:translate(-100%);transition:transform var(--dur-med) var(--ease-out);box-shadow:var(--shadow-lg)}.webapp__sidebar.is-open{transform:none}.webapp__scrim.is-open{display:block;position:fixed;inset:0;z-index:80;background:#17203366}.webapp__item-del{opacity:1}.webapp__thread{padding-top:var(--space-4)}}.app-placeholder{text-align:center;max-width:460px;margin-inline:auto;padding:var(--space-8) 1.25rem}.app-placeholder h1{font-size:var(--text-xl);letter-spacing:var(--tracking-tight)}.app-placeholder p{margin-top:var(--space-3);color:var(--text-2)}.app-placeholder .route-tag{display:inline-block;margin-top:var(--space-4);font-family:var(--font-mono);font-size:var(--text-xs);color:var(--blue-700);background:var(--blue-50);border:1px solid var(--blue-100);border-radius:6px;padding:.3em .7em}.webapp__mat-body{cursor:pointer;min-width:0;flex:1}.prac-list,.prac-form,.prac-detail{display:grid;gap:var(--space-3);align-content:start}.prac-back{justify-self:start;font-size:var(--text-sm);font-weight:600;color:var(--text-2);padding:.2em 0}.prac-back:hover{color:var(--blue-600)}.prac-item{display:flex;align-items:center;gap:.5rem;width:100%;text-align:left;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);padding:.65rem .8rem;transition:border-color var(--dur-fast) var(--ease-out)}.prac-item:hover{border-color:var(--blue-400)}.prac-item.is-generating{border-style:dashed;background:var(--blue-50)}.prac-item>span:last-child{color:var(--text-3)}.prac-item-main strong{display:block;font-size:var(--text-sm);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.prac-item-main small{color:var(--text-3);font-size:var(--text-xs)}.prac-label{font-size:var(--text-xs);font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--text-3);margin-top:var(--space-2)}.prac-tags{display:flex;flex-wrap:wrap;gap:6px}.prac-tag{border:1px solid var(--border);border-radius:var(--radius-full);padding:.32em .85em;font-size:var(--text-xs);color:var(--text-2);background:var(--surface)}.prac-tag.is-active{border-color:var(--blue-500);color:var(--blue-600);background:var(--blue-50);font-weight:600}.prac-input{width:100%;border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.5rem .7rem;font:inherit;font-size:var(--text-sm);resize:vertical}.prac-input:focus{outline:none;border-color:var(--blue-400);box-shadow:0 0 0 3px var(--blue-100)}.prac-mix{border:1px dashed var(--border);border-radius:var(--radius-md);padding:var(--space-3);display:grid;gap:var(--space-2)}.prac-mix-row{display:flex;align-items:center;justify-content:space-between;font-size:var(--text-sm)}.prac-mix-row input{width:64px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.3rem .5rem;font:inherit;font-size:var(--text-sm);text-align:center}.prac-mix-total{color:var(--text-3);font-size:var(--text-xs)}.prac-submit{border:none;background:var(--gradient-cta);color:#fff;font-weight:700;border-radius:var(--radius-md);padding:.6em 1.2em;font-size:var(--text-sm)}.prac-submit:disabled{opacity:.55}.prac-submit--lg{padding:.8em;font-size:var(--text-base)}.prac-title{font-size:var(--text-base)}.prac-meta{font-size:var(--text-xs);color:var(--text-3)}.prac-q{border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-3);display:grid;gap:var(--space-2);background:var(--surface)}.prac-q-head{display:flex;align-items:center;gap:.5rem}.prac-q-num{width:22px;height:22px;border-radius:50%;background:var(--blue-600);color:#fff;font-size:.72rem;font-weight:700;display:grid;place-items:center;flex:none}.prac-q-type{font-size:var(--text-xs);color:var(--text-3)}.prac-stem{font-size:var(--text-sm);line-height:1.6}.prac-passage{font-size:var(--text-xs);color:var(--text-2);background:var(--surface-2);border-radius:var(--radius-sm);padding:.55rem .7rem;line-height:1.6;max-height:140px;overflow-y:auto}.prac-options{display:grid;gap:6px}.prac-opt{display:flex;align-items:flex-start;gap:.5rem;text-align:left;font-size:var(--text-sm);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.45rem .6rem;background:var(--surface);line-height:1.5}.prac-opt-letter{font-weight:700;color:var(--text-3);flex:none}.prac-opt.is-selected{border-color:var(--blue-500);background:var(--blue-50)}.prac-opt.is-selected .prac-opt-letter{color:var(--blue-600)}.prac-opt.is-right{border-color:var(--success);background:#10b98114}.prac-opt.is-wrong{border-color:var(--danger);background:#ef44440f}.prac-opt:disabled{cursor:default}.prac-subq{display:grid;gap:6px;border-left:2px solid var(--blue-100);padding-left:var(--space-3)}.prac-blank{border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.4rem .6rem;font:inherit;font-size:var(--text-sm);width:100%}.prac-essay{border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.5rem .6rem;font:inherit;font-size:var(--text-sm);width:100%;resize:vertical}.prac-blank:focus,.prac-essay:focus{outline:none;border-color:var(--blue-400);box-shadow:0 0 0 3px var(--blue-100)}.prac-q-foot{display:flex;align-items:center;gap:var(--space-2);flex-wrap:wrap}.prac-verdict{font-size:var(--text-sm);font-weight:700}.prac-verdict.is-right{color:var(--success)}.prac-verdict.is-wrong{color:var(--danger)}.prac-feedback{font-size:var(--text-xs);color:var(--text-2)}.webapp__topbar-spacer{flex:1}.webapp__rec{display:inline-flex;align-items:center;gap:.45em;font-size:var(--text-xs);font-weight:700;border:1px solid var(--border);border-radius:var(--radius-full);padding:.4em .9em;color:var(--text-2);background:var(--surface)}.webapp__rec:hover:not(:disabled){color:var(--danger);border-color:var(--danger)}.webapp__rec.is-recording{color:var(--danger);border-color:var(--danger);background:#ef44440f}.webapp__rec.is-recording>svg{animation:pulse-dot 1.2s ease-in-out infinite}.webapp__rec.is-busy{color:var(--blue-600);border-color:var(--blue-100);background:var(--blue-50)}.webapp__rec:disabled{opacity:.5}.notes-panel{display:grid;gap:var(--space-3);align-content:start}.notes-folders{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.notes-folder{display:inline-flex;align-items:center;gap:2px;padding-right:.3em}.notes-folder>button:first-child{font-size:var(--text-xs);color:inherit;padding:.32em .4em}.notes-folder-del{font-size:.8rem;color:var(--text-3);width:18px;height:18px;border-radius:50%}.notes-folder-del:hover{color:var(--danger);background:#ef444414}.notes-newfolder{display:flex;gap:6px}.notes-newfolder input{flex:1;min-width:0;border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.4rem .6rem;font:inherit;font-size:var(--text-xs)}.notes-newfolder button{flex:none;font-size:var(--text-xs);font-weight:600;color:var(--blue-600);padding:0 .8em}.notes-item{position:relative;border:1px solid var(--border);border-radius:var(--radius-md);padding:.65rem .8rem;background:var(--surface);display:grid;gap:var(--space-2)}.notes-item__head{display:flex;align-items:baseline;gap:.5rem;padding-right:3rem}.notes-item__head strong{font-size:var(--text-sm);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.notes-item__head small{color:var(--blue-600);font-size:.66rem;flex:none}.notes-item__body{font-size:var(--text-xs);color:var(--text-2);line-height:1.6;white-space:pre-wrap;max-height:120px;overflow-y:auto;margin:0}.notes-item__actions{position:absolute;top:.5rem;right:.5rem;flex-direction:row}.notes-item__time{font-size:.64rem;color:var(--text-3)}.notes-item textarea{width:100%;border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.5rem;font:inherit;font-size:var(--text-xs);resize:vertical}.grade-panel{display:grid;gap:var(--space-3);align-content:start}.grade-batch{display:grid;gap:var(--space-3)}.webapp.is-right-full{grid-template-columns:0 minmax(0,0) minmax(0,1fr)}.webapp.is-right-full .webapp__sidebar,.webapp.is-right-full .webapp__main{display:none}.webapp__tabs--with-expand{gap:4px}.webapp__tabs--with-expand>button[role=tab]{flex:1 1 0;min-width:0}.webapp__expand{position:static;flex:none;width:32px;height:32px;border-radius:var(--radius-sm);color:var(--text-2);font-size:1rem;display:grid;place-items:center}.webapp__expand:hover{color:var(--blue-600);background:var(--blue-50)}.prac-stem .katex-display,.chatline__bubble--md .katex-display{margin:.5em 0;overflow-x:auto}.sub{min-height:100vh;background:var(--bg);color:var(--text-1)}.sub__bar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:.75rem;padding:.7rem 1.25rem;background:#ffffffeb;backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--border)}.sub__back{font-size:var(--text-sm);color:var(--text-2);text-decoration:none;white-space:nowrap}.sub__back:hover{color:var(--blue-600)}.sub__title{font-size:var(--text-md);font-weight:650;letter-spacing:var(--tracking-tight)}.sub__spacer{flex:1}.sub__balance{font-size:var(--text-sm);color:var(--text-2);background:var(--blue-50);border-radius:var(--radius-full);padding:.3em .85em;white-space:nowrap}.sub__balance b{color:var(--blue-700);font-variant-numeric:tabular-nums}.sub__signout{border:1px solid var(--border);background:var(--surface);color:var(--text-2);border-radius:var(--radius-full);padding:.3em .85em;font-size:var(--text-xs);cursor:pointer}.sub__signout:hover{border-color:var(--border-strong);color:var(--text-1)}.sub__body{max-width:720px;margin:0 auto;padding:1.6rem 1.25rem 3.5rem;display:flex;flex-direction:column;gap:1.4rem}.sub__hint{margin:0;font-size:var(--text-sm);color:var(--text-2)}.sub__section{display:flex;flex-direction:column;gap:.8rem}.sub__h2{margin:0;font-size:var(--text-sm);font-weight:650;color:var(--text-2);text-transform:none}.sub__alert{border-radius:var(--radius-md, 10px);padding:.85rem 1rem;font-size:var(--text-sm);line-height:var(--leading-snug);border:1px solid var(--border);background:var(--surface)}.sub__alert--ok{background:#ecfdf5;border-color:#a7f3d0;color:#065f46}.sub__alert--err{background:#fef2f2;border-color:#fecaca;color:#991b1b}.sub__alert--warn{background:#fffbeb;border-color:#fde68a;color:#92400e}.sub__alert--info{background:var(--blue-50);border-color:var(--blue-100);color:var(--blue-700)}.sub__alert-sub{margin-top:.3rem;font-size:var(--text-sm);opacity:.92;font-variant-numeric:tabular-nums}.sub__inline-btn{margin-left:.6rem;border:1px solid currentColor;background:transparent;color:inherit;border-radius:var(--radius-full);padding:.15em .7em;font-size:var(--text-xs);cursor:pointer}.sub__inline-btn:hover{background:#0000000d}.sub__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:.7rem}.sub__card{display:flex;flex-direction:column;gap:.28rem;text-align:left;padding:.9rem 1rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md, 10px);cursor:pointer;transition:border-color .15s ease,box-shadow .15s ease,transform .15s ease;font:inherit;color:inherit}.sub__card:hover{border-color:var(--blue-300)}.sub__card.is-selected{border-color:var(--blue-500);box-shadow:0 0 0 3px var(--blue-100)}.sub__card-name{font-size:var(--text-sm);color:var(--text-2)}.sub__card-price{font-size:var(--text-xl);font-weight:700;letter-spacing:var(--tracking-tight);color:var(--text-1);font-variant-numeric:tabular-nums}.sub__card-gain{display:flex;flex-wrap:wrap;gap:.35rem;font-size:var(--text-xs);color:var(--blue-700)}.sub__card-gain span{background:var(--blue-50);border-radius:var(--radius-full);padding:.15em .6em}.sub__pay{align-items:flex-start}.sub__paypal{max-width:340px;width:100%}.sub__paypal.is-hidden{display:none}.sub__paypal paypal-button{display:block;width:100%}.sub__table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius-md, 10px);background:var(--surface)}.sub__table{width:100%;border-collapse:collapse;font-size:var(--text-sm)}.sub__table th{text-align:left;font-weight:600;color:var(--text-2);font-size:var(--text-xs);padding:.6rem .85rem;border-bottom:1px solid var(--border);white-space:nowrap}.sub__table td{padding:.6rem .85rem;border-bottom:1px solid var(--border);vertical-align:middle}.sub__table tr:last-child td{border-bottom:none}.sub__td-dim{color:var(--text-3);white-space:nowrap;font-size:var(--text-xs)}.sub__td-mono{font-variant-numeric:tabular-nums;white-space:nowrap}.sub__pill{display:inline-block;border-radius:var(--radius-full);padding:.15em .6em;font-size:var(--text-xs);border:1px solid var(--border);white-space:nowrap}.sub__pill--ok{background:#ecfdf5;border-color:#a7f3d0;color:#065f46}.sub__pill--err{background:#fef2f2;border-color:#fecaca;color:#991b1b}.sub__pill--warn{background:#fffbeb;border-color:#fde68a;color:#92400e}.sub__pill--dim{color:var(--text-2)}.sub__foot{margin:.5rem 0 0;font-size:var(--text-xs);color:var(--text-3);text-align:center}@media(max-width:560px){.sub__body{padding:1.1rem .9rem 3rem}.sub__grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}}.pricing__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:var(--space-4, 1rem);margin-top:var(--space-6, 1.5rem)}.pricing__card{display:flex;flex-direction:column;gap:.5rem;padding:1.35rem 1.25rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg, 14px);transition:border-color .16s ease,box-shadow .16s ease,transform .16s ease}.pricing__card:hover{border-color:var(--blue-300);box-shadow:var(--glow-soft, 0 0 44px rgba(59, 130, 246, .16));transform:translateY(-2px)}.pricing__name{font-size:var(--text-sm);color:var(--text-2)}.pricing__price{font-size:var(--text-2xl);font-weight:750;letter-spacing:var(--tracking-tighter);color:var(--text-1);font-variant-numeric:tabular-nums;line-height:1.1}.pricing__gains{list-style:none;margin:.35rem 0 0;padding:0;display:flex;flex-direction:column;gap:.25rem;font-size:var(--text-sm);color:var(--text-1)}.pricing__gains b{color:var(--blue-700);font-variant-numeric:tabular-nums}.pricing__note{color:var(--text-3);font-size:var(--text-xs);margin-top:.15rem}.pricing__cta{margin-top:auto;width:100%}.pricing__hint{margin-top:var(--space-6, 1.5rem);color:var(--text-2);font-size:var(--text-sm)}.pricing__foot{margin-top:var(--space-6, 1.5rem);color:var(--text-3);font-size:var(--text-xs);line-height:var(--leading-body, 1.65)}.ws{display:flex;flex-direction:column;height:100vh;min-height:0;background:#f8fafc;color:#172033}.ws-header{flex:none;height:64px;display:flex;align-items:center;gap:20px;padding:0 20px;background:#fff;border-bottom:1px solid #e5eaf2;position:relative;z-index:40}.ws-brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px;color:inherit;text-decoration:none;flex:none}.ws-badge{font-size:10px;font-weight:600;color:#2563eb;background:#eff6ff;border:1px solid #dbeafe;border-radius:99px;padding:1px 7px;letter-spacing:.04em}.ws-nav{display:flex;gap:4px;margin:0 auto}.ws-nav__link{padding:7px 14px;border-radius:8px;font-size:13.5px;color:#64748b;text-decoration:none;transition:background .15s,color .15s}.ws-nav__link:hover{background:#f1f5f9;color:#172033}.ws-nav__link.is-active{background:#eff6ff;color:#2563eb;font-weight:600}.ws-header__right{display:flex;align-items:center;gap:8px;margin-left:auto}.ws-searchbtn{display:flex;align-items:center;gap:8px;height:34px;padding:0 10px;min-width:200px;border:1px solid #e5eaf2;border-radius:8px;background:#f8fafc;color:#94a3b8;font-size:12.5px;cursor:pointer;transition:border-color .15s,background .15s}.ws-searchbtn:hover{border-color:#c7d2fe;background:#fff}.ws-searchbtn kbd{margin-left:auto;font-family:inherit;font-size:10px;color:#94a3b8;border:1px solid #e5eaf2;border-radius:4px;padding:1px 5px;background:#fff}.ws-iconbtn{position:relative;width:36px;height:36px;display:grid;place-items:center;border:0;border-radius:8px;background:transparent;color:#64748b;cursor:pointer}.ws-iconbtn:hover{background:#f1f5f9;color:#172033}.ws-dot{position:absolute;top:7px;right:7px;width:7px;height:7px;border-radius:50%;background:#ef4444;border:1.5px solid #fff}.ws-avatarbtn{border:0;background:transparent;padding:0;cursor:pointer;border-radius:50%}.ws-avatar{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;font-size:13px;font-weight:600}.ws-avatarbtn img{width:30px;height:30px;border-radius:50%;display:block}.ws-pop{position:relative}.ws-pop__panel{position:absolute;top:calc(100% + 8px);right:0;width:300px;background:#fff;border:1px solid #e5eaf2;border-radius:12px;box-shadow:0 12px 32px #1720331f;z-index:60;overflow:hidden}.ws-pop__panel--notif{width:340px}.ws-pop__head{display:flex;align-items:center;justify-content:space-between;padding:12px 14px 8px;font-size:13px}.ws-pop__head button{border:0;background:none;color:#2563eb;font-size:12px;cursor:pointer}.ws-pop__body{max-height:340px;overflow:auto;padding:0 8px 8px}.ws-notif{display:block;width:100%;text-align:left;border:0;background:none;border-radius:8px;padding:9px 10px;cursor:pointer;font-size:12.5px}.ws-notif:hover{background:#f8fafc}.ws-notif strong{display:block;color:#172033}.ws-notif span{display:block;color:#64748b;margin:2px 0}.ws-notif small{color:#94a3b8}.ws-notif.is-read{opacity:.55}.ws-pop__panel--user{padding:8px;display:flex;flex-direction:column}.ws-userhead{padding:8px 10px 12px;border-bottom:1px solid #e5eaf2;margin-bottom:6px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}.ws-userhead strong{width:100%;font-size:14px}.ws-userhead small{color:#94a3b8}.ws-viptag{font-size:11px;padding:1px 8px;border-radius:99px;background:#f1f5f9;color:#64748b}.ws-viptag.is-on{background:#fef3c7;color:#92400e}.ws-points{font-size:12px;color:#64748b;margin-left:auto}.ws-pop__panel--user a,.ws-pop__panel--user button{display:block;width:100%;text-align:left;padding:8px 10px;border:0;border-radius:8px;background:none;color:#172033;font-size:13px;text-decoration:none;cursor:pointer}.ws-pop__panel--user a:hover,.ws-pop__panel--user button:hover{background:#f1f5f9}.ws-pop__panel--user .ws-signout{color:#dc2626}.ws-body{flex:1;display:flex;min-height:0}.ws-side{flex:none;width:248px;display:flex;flex-direction:column;background:#fff;border-right:1px solid #e5eaf2;padding:14px 10px 10px;min-height:0}.ws-side__label{font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#94a3b8;padding:0 10px 8px}.ws-side__list{flex:1;overflow-y:auto;min-height:0;display:flex;flex-direction:column;gap:2px}.ws-side__item{display:flex;align-items:center;gap:9px;padding:7px 10px;border-radius:8px;color:#172033;text-decoration:none;font-size:13.5px;border:0;background:none;cursor:pointer;text-align:left;width:100%}.ws-side__item:hover{background:#f1f5f9}.ws-side__item.is-active{background:#eff6ff;color:#2563eb;font-weight:600}.ws-side__ico{flex:none;display:grid;place-items:center;color:#94a3b8}.ws-side__item.is-active .ws-side__ico{color:#2563eb}.ws-side__txt{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ws-side__new{flex:none;margin-top:8px;padding:8px 10px;border:1px dashed #cbd5e1;border-radius:8px;background:none;color:#64748b;font-size:13px;cursor:pointer;transition:border-color .15s,color .15s}.ws-side__new:hover{border-color:#3b82f6;color:#2563eb}.ws-side__foot{flex:none;border-top:1px solid #e5eaf2;margin-top:10px;padding-top:8px;display:flex;flex-direction:column;gap:2px}.ws-scrim{position:fixed;inset:64px 0 0;background:#0f172a59;z-index:45}.ws-main{flex:1;min-width:0;min-height:0;overflow:auto;display:flex;flex-direction:column;padding:22px 26px;position:relative}.ws-netwarn{flex:none;display:flex;align-items:center;gap:10px;background:#fef2f2;color:#b91c1c;border:1px solid #fecaca;border-radius:8px;padding:8px 12px;font-size:13px;margin-bottom:12px}.ws-netwarn button{border:0;background:none;color:#b91c1c;text-decoration:underline;cursor:pointer}.ws-empty{color:#94a3b8;font-size:13px;padding:10px 0}.ws-thinking{color:#94a3b8;font-size:13px;animation:ws-pulse 1.2s ease-in-out infinite}@keyframes ws-pulse{50%{opacity:.45}}.ws-error{display:flex;align-items:center;gap:10px;background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;border-radius:8px;padding:8px 12px;font-size:13px;margin:8px 0}.ws-error button{border:0;background:none;color:inherit;cursor:pointer;font-size:12.5px;text-decoration:underline}.ws-pill{display:inline-flex;align-items:center;font-size:11.5px;padding:2px 9px;border-radius:99px;background:#f1f5f9;color:#64748b}.ws-pill.is-ok{background:#dcfce7;color:#166534}.ws-pill.is-warn{background:#fef3c7;color:#92400e}.ws-pill.is-busy{background:#eff6ff;color:#2563eb}.ws-skeleton{display:flex;flex-direction:column;gap:8px}.ws-skeleton span{display:block;height:52px;border-radius:10px;background:linear-gradient(90deg,#eef2f7 25%,#f8fafc,#eef2f7 75%);background-size:200% 100%;animation:ws-shimmer 1.4s infinite}@keyframes ws-shimmer{to{background-position:-200% 0}}.ws-estatelpage{display:flex;flex-direction:column;align-items:center;gap:10px;padding:48px 20px;color:#64748b;text-align:center}.ws-estatelpage img{max-width:160px}.ws-field{display:flex;flex-direction:column;gap:6px;font-size:13px;color:#64748b}.ws-field input,.ws-field select{height:38px;border:1px solid #e5eaf2;border-radius:8px;padding:0 12px;font-size:14px;background:#fff;color:inherit;min-width:260px}.ws-field input:focus,.ws-field select:focus,.ws-input:focus{outline:none;border-color:#3b82f6;box-shadow:0 0 0 3px #3b82f61f}.ws-input{height:36px;border:1px solid #e5eaf2;border-radius:8px;padding:0 12px;font-size:13.5px;background:#fff;color:inherit}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.btn{display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 14px;border:1px solid #e5eaf2;border-radius:8px;background:#fff;color:#172033;font-size:13.5px;cursor:pointer;text-decoration:none;transition:background .15s,border-color .15s,transform .05s}.btn:hover{background:#f8fafc;border-color:#d3dce8}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:#2563eb;border-color:#2563eb;color:#fff}.btn-primary:hover{background:#1d4ed8;border-color:#1d4ed8}.btn-danger{color:#dc2626;border-color:#fecaca}.btn-danger:hover{background:#fef2f2}.btn-sm{height:30px;padding:0 10px;font-size:12.5px}.btn-lg{height:42px;padding:0 20px;font-size:14.5px;border-radius:10px}.btn.is-on{background:#eff6ff;border-color:#bfdbfe;color:#2563eb}.btn.is-rec{background:#fef2f2;border-color:#fecaca;color:#dc2626}.ws-search{position:fixed;inset:0;background:#0f172a66;z-index:100;display:flex;justify-content:center;padding-top:12vh}.ws-search__panel{width:min(640px,92vw);max-height:70vh;background:#fff;border-radius:14px;box-shadow:0 24px 64px #0f172a40;display:flex;flex-direction:column;overflow:hidden}.ws-search__bar{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid #e5eaf2;color:#94a3b8}.ws-search__bar input{flex:1;border:0;outline:none;font-size:15px;color:inherit;background:none}.ws-search__spin{width:14px;height:14px;border:2px solid #dbeafe;border-top-color:#2563eb;border-radius:50%;animation:ws-rot .8s linear infinite}@keyframes ws-rot{to{transform:rotate(360deg)}}.ws-search__esc{border:1px solid #e5eaf2;background:#f8fafc;border-radius:5px;font-size:10.5px;padding:2px 6px;color:#94a3b8;cursor:pointer}.ws-search__body{overflow:auto;padding:8px}.ws-search__grouplabel{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:#94a3b8;padding:10px 10px 4px}.ws-search__row{display:flex;align-items:baseline;gap:10px;width:100%;border:0;background:none;text-align:left;padding:9px 10px;border-radius:8px;cursor:pointer;font-size:13.5px}.ws-search__row:hover{background:#eff6ff}.ws-search__row strong{color:#172033;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ws-search__row span{margin-left:auto;color:#94a3b8;font-size:12px;flex:none}.page-home{max-width:1100px;width:100%;margin:0 auto;display:flex;flex-direction:column;gap:26px}.home-hero{display:flex;align-items:center;gap:30px;background:#fff;border:1px solid #e5eaf2;border-radius:16px;padding:30px 36px}.home-hero__txt{flex:1;min-width:0}.home-hero__hi{color:#64748b;font-size:14px;margin:0 0 4px}.home-hero__txt h1{font-size:clamp(20px,2.6vw,28px);margin:0 0 18px;font-weight:700}.home-hero__cta{display:flex;gap:10px;flex-wrap:wrap}.home-hero__meta{margin-top:14px;font-size:13px;color:#64748b;display:flex;align-items:center;gap:8px}.home-hero__sep{color:#94a3b8}.home-hero__buy{color:#2563eb;text-decoration:none;font-size:12.5px}.home-hero__cat{flex:none;width:clamp(140px,18vw,220px)}.home-hero__cat img{width:100%;height:auto;display:block}.home-entries{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.home-entry{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;background:#fff;border:1px solid #e5eaf2;border-radius:12px;cursor:pointer;text-align:left;transition:border-color .15s,box-shadow .15s}.home-entry:hover{border-color:#bfdbfe;box-shadow:0 4px 14px #2563eb14}.home-entry__ico{flex:none;width:36px;height:36px;border-radius:9px;background:#eff6ff;color:#2563eb;display:grid;place-items:center}.home-entry__txt strong{display:block;font-size:14px;color:#172033}.home-entry__txt small{color:#64748b;font-size:12.5px}.home-sechead{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:10px}.home-sechead h2{font-size:16px;margin:0}.home-sechead a{font-size:12.5px;color:#2563eb;text-decoration:none}.home-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.home-card{background:#fff;border:1px solid #e5eaf2;border-radius:12px;padding:14px 16px;text-decoration:none;color:inherit;transition:border-color .15s,box-shadow .15s}.home-card:hover{border-color:#bfdbfe;box-shadow:0 4px 14px #2563eb14}.home-card__top{display:flex;align-items:center;gap:8px;margin-bottom:6px}.home-card__top strong{font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.home-card__ico{color:#2563eb;flex:none;display:grid;place-items:center}.home-card small{color:#94a3b8;font-size:12px;display:flex;align-items:center;gap:8px}.home-card__tag{background:#eff6ff;color:#2563eb;border-radius:99px;padding:1px 8px;font-size:11px}.home-classes{background:#fff;border:1px solid #e5eaf2;border-radius:12px;overflow:hidden}.home-classrow{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;text-decoration:none;color:inherit;border-bottom:1px solid #e5eaf2;font-size:13.5px}.home-classrow:last-child{border-bottom:0}.home-classrow:hover{background:#f8fafc}.home-classrow__course{font-weight:600;color:#172033;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.home-classrow__meta{color:#94a3b8;font-size:12px;flex:none}.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:16px;flex-wrap:wrap}.page-head h1{font-size:20px;margin:0 0 2px}.page-head__sub{color:#94a3b8;font-size:13px;margin:0}.page-head__actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.chip-row{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}.chip{border:1px solid #e5eaf2;background:#fff;border-radius:99px;padding:5px 13px;font-size:12.5px;color:#64748b;cursor:pointer;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chip:hover{border-color:#cbd5e1;color:#172033}.chip.is-active{background:#2563eb;border-color:#2563eb;color:#fff}.tab-row{display:flex;gap:2px;border-bottom:1px solid #e5eaf2;margin-bottom:14px}.tab{border:0;background:none;padding:8px 14px;font-size:13px;color:#64748b;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px}.tab:hover{color:#172033}.tab.is-active{color:#2563eb;border-bottom-color:#2563eb;font-weight:600}.dropzone{pointer-events:none}.dropzone.is-drag{pointer-events:auto;position:fixed;inset:64px 0 0;z-index:90;background:#2563eb0f}.dropzone__inner{margin:24px;height:calc(100% - 48px);border:2px dashed #3b82f6;border-radius:16px;background:#ffffffe6;display:grid;place-items:center;font-size:16px;color:#2563eb;font-weight:600}.upload-queue{margin-bottom:12px;border:1px solid #e5eaf2;border-radius:10px;background:#fff;overflow:hidden}.upload-queue__row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 14px;font-size:13px;border-bottom:1px solid #e5eaf2}.upload-queue__row:last-child{border-bottom:0}.upload-queue__name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.upload-queue__state{flex:none;font-size:12px;color:#94a3b8}.upload-queue__row.is-done .upload-queue__state{color:#16a34a}.upload-queue__row.is-fail .upload-queue__state{color:#dc2626}.lib-list{display:flex;flex-direction:column;gap:8px;max-width:980px}.lib-row{background:#fff;border:1px solid #e5eaf2;border-radius:10px;text-decoration:none;color:inherit;transition:border-color .15s}.lib-row:hover{border-color:#c7d2fe}.lib-row.is-open{border-color:#3b82f6}.lib-row__main{display:flex;align-items:center;gap:12px;padding:11px 14px;cursor:pointer}.lib-row__ico{flex:none;width:34px;height:34px;border-radius:8px;display:grid;place-items:center;background:#f1f5f9;color:#64748b}.lib-row__ico.is-audio{background:#fef3c7;color:#b45309}.lib-row__ico.is-pdf{background:#fee2e2;color:#b91c1c}.lib-row__ico.is-md,.lib-row__ico.is-class{background:#eff6ff;color:#2563eb}.lib-row__body{flex:1;min-width:0}.lib-row__body strong{display:block;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lib-row__body small{color:#94a3b8;font-size:12px}.lib-row__del{flex:none;border:0;background:none;color:#94a3b8;font-size:16px;cursor:pointer;width:28px;height:28px;border-radius:6px}.lib-row__del:hover{background:#fef2f2;color:#dc2626}.lib-row__detail{border-top:1px solid #e5eaf2;padding:12px 16px;background:#fbfcfe;border-radius:0 0 10px 10px}.lib-chunk{font-size:12.5px;color:#64748b;margin:0 0 8px;line-height:1.55}.lib-chunk small{display:inline-block;background:#eef2f7;border-radius:4px;padding:0 5px;margin-right:6px;font-size:10.5px}.lib-row__acts{display:flex;gap:8px;margin-top:10px}.proj{flex:1;min-height:0;display:flex;gap:0;max-width:1400px;width:100%;margin:0 auto}.proj__chat{flex:1;min-width:0;display:flex;flex-direction:column;min-height:0}.proj__bar{display:flex;align-items:center;gap:10px;padding-bottom:12px;border-bottom:1px solid #e5eaf2}.proj__title{font-size:15px;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.proj__bar-spacer{flex:1}.proj__bar .btn{flex:none}.proj__scroll{flex:1;overflow-y:auto;min-height:0;padding:18px 4px}.proj__thread{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:14px}.thread-skel{max-width:760px;margin:0 auto}.ws-welcome{text-align:center;padding:8vh 20px 20px;color:#64748b}.ws-welcome h3{margin:10px 0 4px;color:#172033}.ws-welcome img{max-width:150px}.proj__composer{flex:none;display:flex;align-items:flex-end;gap:8px;max-width:760px;width:100%;margin:0 auto 4px;border:1px solid #e5eaf2;border-radius:12px;background:#fff;padding:10px 12px;box-shadow:0 2px 10px #1720330d}.proj__composer:focus-within{border-color:#3b82f6}.proj__composer textarea{flex:1;border:0;outline:none;resize:none;font-size:14px;font-family:inherit;color:inherit;max-height:160px;background:none}.proj__send{flex:none;width:34px;height:34px;border-radius:9px;border:0;background:#2563eb;color:#fff;cursor:pointer;font-size:14px}.proj__send:disabled{opacity:.5}.proj__rail{flex:none;width:min(380px,34vw);margin-left:18px;border-left:1px solid #e5eaf2;padding-left:18px;display:flex;flex-direction:column;min-height:0}.proj__tabs{display:flex;gap:2px;flex:none;border-bottom:1px solid #e5eaf2}.proj__tabs button{border:0;background:none;padding:8px 12px;font-size:12.5px;color:#64748b;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px}.proj__tabs button.is-active{color:#2563eb;border-bottom-color:#2563eb;font-weight:600}.proj__rail-body{flex:1;overflow-y:auto;min-height:0;padding:12px 2px}.proj__mats{display:flex;flex-direction:column;gap:8px}.proj__mat-tools{display:flex;gap:8px}.proj__hint{font-size:12px;color:#94a3b8;margin:0}.proj__note-form{display:flex;flex-direction:column;gap:8px;border:1px solid #e5eaf2;border-radius:10px;padding:12px}.proj__note-form input,.proj__note-form textarea{border:1px solid #e5eaf2;border-radius:8px;padding:8px 10px;font-size:13px;font-family:inherit;color:inherit}.proj__note-actions{display:flex;gap:8px}.proj__mat{display:flex;gap:8px;border:1px solid #e5eaf2;border-radius:10px;padding:10px 12px;background:#fff}.proj__mat-body{flex:1;min-width:0;cursor:pointer}.proj__mat-body strong{display:block;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.proj__mat-body small{color:#94a3b8;font-size:11.5px}.proj__chunks{margin-top:8px;font-size:12px;color:#64748b;max-height:200px;overflow:auto}.proj__chunks p{margin:0 0 6px}.proj__chunks small{background:#eef2f7;border-radius:4px;padding:0 4px;margin-right:4px}.proj__mat-del{flex:none;align-self:flex-start;border:0;background:none;color:#94a3b8;font-size:15px;cursor:pointer}.proj__mat-del:hover{color:#dc2626}.cls-setup{max-width:520px;margin:6vh auto 0;display:flex;flex-direction:column;gap:14px}.cls-setup h1{margin:0;font-size:22px}.cls-setup__acts{display:flex;gap:10px;margin-top:6px}.cls-live{flex:1;min-height:0;display:flex;flex-direction:column;max-width:1400px;width:100%;margin:0 auto}.cls-live__bar{flex:none;display:flex;align-items:center;gap:18px;padding-bottom:12px;border-bottom:1px solid #e5eaf2;flex-wrap:wrap}.cls-live__meta{display:flex;align-items:baseline;gap:10px;min-width:0}.cls-live__meta h2{margin:0;font-size:16px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cls-live__sub{color:#94a3b8;font-size:12.5px;flex:none}.cls-live__status{display:flex;align-items:center;gap:8px;font-size:13px;color:#64748b}.cls-live__status.is-recording{color:#dc2626}.cls-live__status.is-paused{color:#b45309}.cls-live__dot{width:9px;height:9px;border-radius:50%;background:currentColor}.cls-live__status.is-recording .cls-live__dot{animation:ws-pulse 1.2s infinite}.cls-live__clock{font-variant-numeric:tabular-nums;font-size:15px;color:#172033}.cls-live__acts{margin-left:auto;display:flex;gap:8px}.cls-live__cols{flex:1;min-height:0;display:flex;gap:20px;padding-top:14px}.cls-live__transcript,.cls-live__ai{flex:1;min-width:0;display:flex;flex-direction:column;min-height:0}.cls-live__transcript{flex:1.4}.cls-live__colhead{flex:none;display:flex;align-items:center;gap:10px;padding-bottom:8px}.cls-live__colhead h3{margin:0;font-size:13.5px;color:#64748b;text-transform:uppercase;letter-spacing:.04em}.cls-live__tscroll,.cls-live__aiscroll{flex:1;overflow-y:auto;min-height:0;background:#fff;border:1px solid #e5eaf2;border-radius:12px;padding:14px 16px}.cls-live__aiscroll{display:flex;flex-direction:column;gap:10px}.cls-line{display:flex;gap:8px;font-size:13.5px;line-height:1.65;padding:3px 0}.cls-line__ts{flex:none;font-variant-numeric:tabular-nums;color:#2563eb;font-size:12px;padding-top:2px}.cls-line__who{flex:none;font-weight:600;color:#172033}.cls-line__txt{color:#172033;word-break:break-word}.cls-ai-hint{text-align:center;color:#94a3b8;margin:auto;font-size:13.5px}.cls-ai-hint img{display:block;margin:0 auto 8px;border-radius:50%}.cls-ai-composer{flex:none;display:flex;gap:8px;margin-top:10px;border:1px solid #e5eaf2;border-radius:10px;background:#fff;padding:8px 10px}.cls-ai-composer input{flex:1;border:0;outline:none;font-size:13.5px;font-family:inherit;color:inherit;background:none}.cls-detail{max-width:1200px;width:100%;margin:0 auto}.cls-detail__cols{display:flex;gap:20px;align-items:flex-start}.cls-detail__main{flex:1.5;min-width:0;display:flex;flex-direction:column;gap:16px}.cls-detail__side{flex:1;min-width:280px;max-width:420px;display:flex;flex-direction:column;gap:16px}.cls-detail__card{background:#fff;border:1px solid #e5eaf2;border-radius:12px;padding:16px 18px}.cls-detail__card h3{margin:0 0 10px;font-size:14px}.cls-detail__cardhead{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.cls-detail__cardhead h3{margin:0}.cls-detail__tlist{max-height:52vh;overflow-y:auto}.cls-qa strong{font-size:13px;display:block;margin:4px 0}.cls-qa p{margin:0 0 10px;color:#64748b;font-size:13px}.cls-steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:13px}.cls-steps .is-done{color:#16a34a}.cls-steps .is-busy{color:#2563eb}.cls-steps .is-todo{color:#94a3b8}.page-practice{max-width:1000px;width:100%;margin:0 auto;display:flex;flex-direction:column}.prac-full{max-width:none}.prac-project-hint{font-size:13px;color:#64748b;margin:0 0 10px}.prac-list .prac-item{display:flex;align-items:center;gap:12px;width:100%;background:#fff;border:1px solid #e5eaf2;border-radius:10px;padding:13px 16px;cursor:pointer;text-align:left;margin-bottom:8px;font-family:inherit}.prac-list .prac-item:hover{border-color:#c7d2fe}.prac-item.is-generating{border-style:dashed;color:#64748b}.prac-item-main{flex:1;min-width:0}.prac-item-main strong{display:block;font-size:14px}.prac-item-main small{color:#94a3b8;font-size:12px}.prac-form,.prac-detail{background:#fff;border:1px solid #e5eaf2;border-radius:12px;padding:20px 22px}.prac-back{border:0;background:none;color:#2563eb;cursor:pointer;font-size:13px;padding:0;margin-bottom:14px}.prac-label{display:block;font-size:12.5px;font-weight:600;color:#64748b;margin:14px 0 6px}.prac-tags{display:flex;gap:6px;flex-wrap:wrap}.prac-tag{border:1px solid #e5eaf2;background:#fff;border-radius:99px;padding:5px 12px;font-size:12.5px;cursor:pointer}.prac-tag.is-active{background:#eff6ff;border-color:#3b82f6;color:#2563eb}.prac-input{width:100%;border:1px solid #e5eaf2;border-radius:8px;padding:9px 12px;font-size:13.5px;font-family:inherit;color:inherit}.prac-mix-row{display:flex;align-items:center;gap:10px;margin-bottom:6px;font-size:13px}.prac-mix-row input{width:70px;border:1px solid #e5eaf2;border-radius:6px;padding:4px 8px}.prac-mix-total{color:#94a3b8}.prac-submit{margin-top:16px;height:38px;padding:0 18px;border:0;border-radius:9px;background:#2563eb;color:#fff;font-size:13.5px;cursor:pointer}.prac-submit:disabled{opacity:.5;cursor:not-allowed}.prac-submit--lg{height:42px;font-size:14.5px}.prac-title{margin:0 0 4px}.prac-meta{color:#94a3b8;font-size:12.5px;margin:0 0 16px}.prac-q{border:1px solid #e5eaf2;border-radius:10px;padding:14px 16px;margin-bottom:12px}.prac-q-stem{font-size:14px;line-height:1.6;margin:0 0 10px}.prac-options{display:flex;flex-direction:column;gap:6px}.prac-opt{display:flex;align-items:center;gap:10px;border:1px solid #e5eaf2;background:#fff;border-radius:8px;padding:8px 12px;cursor:pointer;font-size:13.5px;text-align:left}.prac-opt:hover{border-color:#c7d2fe}.prac-opt.is-selected{background:#eff6ff;border-color:#3b82f6}.prac-opt-letter{flex:none;width:22px;height:22px;border-radius:50%;background:#f1f5f9;display:grid;place-items:center;font-size:11.5px}.prac-blank,.prac-essay{border:1px solid #e5eaf2;border-radius:8px;padding:8px 12px;font-size:13.5px;font-family:inherit;margin-top:8px;width:100%}.prac-q-foot{display:flex;align-items:center;gap:10px;margin-top:10px}.prac-verdict.is-right{color:#16a34a;font-weight:600}.prac-verdict.is-wrong{color:#dc2626;font-weight:600}.prac-feedback{color:#64748b;font-size:12.5px}.page-me,.page-settings{max-width:1000px;width:100%;margin:0 auto}.me-head{display:flex;align-items:center;gap:18px;background:#fff;border:1px solid #e5eaf2;border-radius:14px;padding:22px 26px;margin-bottom:18px;flex-wrap:wrap}.me-head__avatar{width:72px;height:72px;border-radius:50%;display:block}.me-head__avatar--txt{display:grid;place-items:center;background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;font-size:26px;font-weight:700}.me-head__info{flex:1;min-width:200px}.me-head__info h1{margin:0 0 4px;font-size:20px}.me-head__info p{margin:0;color:#94a3b8;font-size:12.5px}.me-head__badges{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.me-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:14px}.me-card{background:#fff;border:1px solid #e5eaf2;border-radius:12px;padding:18px 20px}.me-card h3{margin:0 0 2px;font-size:14.5px}.me-card__sub{color:#94a3b8;font-size:12.5px;margin:0 0 12px}.me-card__note{color:#94a3b8;font-size:12px;margin:12px 0 0}.me-kv{margin:0;display:flex;flex-direction:column;gap:6px}.me-kv>div{display:flex;justify-content:space-between;gap:12px;font-size:13px}.me-kv dt{color:#94a3b8}.me-kv dd{margin:0;color:#172033;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:60%}.me-stats{display:flex;gap:26px}.me-stats>div{display:flex;flex-direction:column}.me-stats strong{font-size:22px}.me-stats span{color:#94a3b8;font-size:12px}.me-bar{height:8px;border-radius:99px;background:#eef2f7;overflow:hidden;margin-bottom:12px}.me-bar span{display:block;height:100%;border-radius:99px;background:#3b82f6}.me-bar span.is-warn{background:#ef4444}.me-points{display:flex;align-items:center;gap:8px;font-size:13px;color:#64748b}.me-points strong{font-size:22px;color:#172033}.me-tx-toggle{margin-left:auto;border:0;background:none;color:#2563eb;cursor:pointer;font-size:12.5px}.me-txs{list-style:none;margin:10px 0 0;padding:0;max-height:220px;overflow:auto}.me-txs li{display:flex;align-items:center;gap:10px;padding:6px 0;border-bottom:1px solid #e5eaf2;font-size:12.5px}.me-txs li:last-child{border-bottom:0}.me-txs span{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.me-txs small{color:#94a3b8;flex:none}.me-txs strong.is-neg{color:#dc2626}.me-txs strong.is-pos{color:#16a34a}.me-lang{display:flex;gap:6px}.me-links{display:flex;gap:14px;font-size:13px}.me-links a{color:#2563eb;text-decoration:none}.set-card{background:#fff;border:1px solid #e5eaf2;border-radius:12px}.set-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 20px;border-bottom:1px solid #e5eaf2;flex-wrap:wrap}.set-row:last-child{border-bottom:0}.set-row strong{font-size:13.5px;display:block}.set-row small{color:#94a3b8;font-size:12px}.ws-burger,.ws-tabs{display:none}@media(max-width:1100px){.ws-searchbtn{min-width:0}.ws-searchbtn span,.ws-searchbtn kbd{display:none}.proj__rail{width:min(340px,38vw)}}@media(max-width:1024px){.ws-side{position:fixed;top:64px;bottom:0;left:0;z-index:46;transform:translate(-100%);transition:transform .2s;box-shadow:4px 0 24px #0f172a14}.ws-side.is-open{transform:none}.ws-burger{display:block}.cls-detail__cols{flex-direction:column}.cls-detail__side{max-width:none}.cls-live__cols{flex-direction:column;overflow-y:auto}.cls-live__transcript,.cls-live__ai{flex:none;min-height:300px}}@media(max-width:767px){.ws{height:100dvh}.ws-nav{display:none}.ws-main{padding:16px 14px calc(64px + env(safe-area-inset-bottom,0px))}.ws-tabs{display:flex;position:fixed;left:0;right:0;bottom:0;height:calc(56px + env(safe-area-inset-bottom,0px));padding-bottom:env(safe-area-inset-bottom,0px);background:#fff;border-top:1px solid #e5eaf2;z-index:50}.ws-tab{flex:1;display:grid;place-items:center;font-size:11.5px;color:#94a3b8;text-decoration:none}.ws-tab.is-active{color:#2563eb;font-weight:600}.ws-burger{position:fixed;left:14px;top:14px;z-index:41;width:36px;height:36px;border-radius:8px;border:0;background:#fff;box-shadow:0 2px 8px #0f172a1a;cursor:pointer}.ws-brand{margin-left:44px}.proj{flex-direction:column}.proj__rail{width:auto;margin-left:0;border-left:0;border-top:1px solid #e5eaf2;padding-left:0;padding-top:12px;max-height:45vh}.home-hero{flex-direction:column-reverse;text-align:center;padding:22px}.home-hero__cta,.home-hero__meta{justify-content:center}.cls-live__acts{margin-left:0;width:100%}}
