@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/xuexi/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2) format("woff2"),url(/xuexi/assets/KaTeX_AMS-Regular-DMm9YOAa.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Main-Bold-Cx986IdX.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Main-Bold-Jm3AIy58.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Main-Italic-BMLOBm91.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Main-Regular-B22Nviop.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Main-Regular-Dr94JaBh.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Math-Italic-t53AETM-.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Math-Italic-DA0__PXp.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2) format("woff2"),url(/xuexi/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2) format("woff2"),url(/xuexi/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2) format("woff2"),url(/xuexi/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Script-Regular-D3wIWfF6.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Script-Regular-D5yQViql.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Size1-Regular-C195tn64.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Size2-Regular-oD1tc_U0.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Size3-Regular-CTq5MqoE.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Size4-Regular-BF-4gkZK.woff) format("woff"),url(/xuexi/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(/xuexi/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2) format("woff2"),url(/xuexi/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff) format("woff"),url(/xuexi/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{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif;color:#2a3430;background:#f7f8f4;font-synthesis:none;font-weight:400;--green:#285847;--dark:#234d40;--soft:#eaf0e4;--muted:#828b80;--line:#e5e8df;--paper:#fffefa}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{border:0;background:none;color:inherit}button:disabled{cursor:not-allowed;opacity:.42}button,a,input,textarea{outline-offset:4px}button:focus-visible,a:focus-visible{outline:2px solid #66977a}input:focus,textarea:focus{outline:none}a{color:var(--green)}textarea{resize:none}svg{flex-shrink:0}button{transition:background .16s,opacity .16s,transform .16s}h1,h2,h3,p{margin-top:0}button:active:not(:disabled){transform:translateY(1px)}.primary{display:inline-flex;align-items:center;justify-content:center;gap:15px;background:var(--green);color:#fff;padding:13px 21px;border-radius:10px;font-size:14px;font-weight:550}.primary:hover:not(:disabled){background:#1e4637}.primary.wide{width:100%;margin-top:22px;padding:16px}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:8px;color:#7a8479}.icon-button:hover{background:#edf0e7}.error-text{color:#a74838;font-size:13px;line-height:1.8;margin:12px 0 0}.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.brand-mark{width:43px;height:43px;border-radius:13px;background:var(--green);display:inline-grid;place-items:center;flex-shrink:0}.brand-mark svg{width:39px;height:39px}.brand-mark path{stroke:#eaf1d5;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;fill:none}.brand-mark.small{width:33px;height:33px;border-radius:10px}.brand-mark.small svg{width:31px;height:31px}.brand-sub{display:block;font-size:10px;letter-spacing:1.6px;color:#939b8b;font-weight:400;margin-top:6px}.eyebrow{font-size:12px;color:#73866f;letter-spacing:1px;display:flex;align-items:center;gap:8px}.eyebrow>span{width:6px;height:6px;background:#93a47f;border-radius:50%}.mobile-only{display:none}.page-loading{display:flex;flex:1;min-height:50vh;justify-content:center;align-items:center;flex-direction:column;gap:20px;color:var(--muted);font-size:14px}.page-loading>p{margin:0}.login-page{min-height:100dvh;background:radial-gradient(ellipse at 28% 46%,#eef2e5,transparent 52%),#f8f9f5;display:flex;flex-direction:column}.login-brand{display:flex;align-items:center;gap:12px;margin:36px 5.5vw;font-size:19px;font-weight:650}.login-main{display:flex;align-items:center;justify-content:center;gap:10vw;flex:1;max-width:1240px;width:100%;margin:0 auto;padding:20px 60px 40px}.login-story{max-width:480px}.login-story h1{font-size:58px;line-height:1.4;letter-spacing:2px;font-family:Songti SC,"Noto Serif CJK SC",serif;font-weight:550;margin:24px 0}.login-story h1 em{font-style:normal;color:var(--green)}.hero-description{color:#8a9385;font-size:15px;line-height:2;letter-spacing:.7px}.learning-sketch{width:315px;height:205px;margin:0 0 -20px 28px}.login-card{width:365px;flex-shrink:0;padding:37px 34px;background:#fffefb;border:1px solid #e4e7dc;border-radius:18px;box-shadow:0 12px 60px #35452d07}.card-kicker{font-size:11px;letter-spacing:2px;color:#90a07e}.login-card h2{font-size:23px;font-weight:560;margin:16px 0}.login-card>p{font-size:13px;color:#8a9185;line-height:1.85}.login-card label{display:block;font-size:12px;margin:30px 0 10px}.login-card input{width:100%;border:1px solid #dce1d5;background:#fafbf7;border-radius:9px;padding:14px 13px;font-size:14px;letter-spacing:.6px;color:#305441}.login-card input:focus{border-color:#8ba884;box-shadow:0 0 0 3px #eff4e8}.login-card input::placeholder{color:#a4ac9c}.login-note{border-top:1px solid #eef0e8;margin-top:30px;padding-top:19px;display:flex;gap:7px;color:#949c8b;font-size:11px}.login-footer{text-align:center;color:#a7ae9f;font-size:11px;padding:25px;letter-spacing:1px}.app-shell{height:100dvh;display:flex;overflow:hidden}.sidebar{width:256px;flex-shrink:0;display:flex;flex-direction:column;background:#f0f2ea;border-right:1px solid var(--line);padding:32px 17px 0}.brand{display:flex;align-items:center;text-align:left;gap:12px;padding:0 10px;font-size:18px;font-weight:650}.new-button{margin:34px 5px 30px;padding:13px 14px;display:flex;align-items:center;gap:10px;border:1px solid #c8d3bd;background:#e5ebdc;border-radius:9px;color:#3c634c;font-size:13px}.new-button:hover{background:#dce5d1}.new-button>span{margin-left:auto;font-size:15px;color:#99a48d}.sidebar-section-title{display:flex;justify-content:space-between;align-items:center;color:#98a08e;font-size:10px;letter-spacing:1.2px;margin:0 15px 15px}.history-list{flex:1;overflow:auto;padding-bottom:25px;scrollbar-width:thin}.empty-history{margin:30px 15px;color:#a9b19f;line-height:1.9;font-size:12px}.empty-history p{margin-top:12px}.history-item{width:100%;display:flex;text-align:left;align-items:center;gap:10px;margin:5px 0;padding:12px 10px;border-radius:9px;color:#66745f}.history-item:hover{background:#e9eddf}.history-item.selected{background:#e0e8d5}.history-dot{width:26px;height:26px;display:grid;place-items:center;border:1px solid #d3dac8;border-radius:7px;flex-shrink:0}.history-dot.completed{background:#e3ecd6;border:0;color:#6b8a54}.history-copy{overflow:hidden;flex:1}.history-copy strong{font-size:12px;display:block;font-weight:500;white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.history-copy small{font-size:10px;color:#939e86;display:flex;gap:6px;margin-top:7px}.history-item>svg{color:#8e9b82}.sidebar-bottom{padding:15px 10px 20px}.daily-usage{font-size:10px;color:#97a18c;display:flex;justify-content:space-between}.usage-track{height:3px;border-radius:10px;background:#e0e6d7;margin:10px 0 23px;overflow:hidden}.usage-track i{height:100%;display:block;background:#95a97f}.user-row{display:flex;align-items:center;border-top:1px solid #dfe4d7;padding-top:19px;gap:10px}.user-avatar{width:31px;height:31px;display:grid;place-items:center;background:#e0e5d4;border-radius:50%;color:#6c7d5d;font-size:12px}.user-row>div{flex:1}.user-row strong{font-size:12px;font-weight:500;display:block}.user-row small{font-size:9px;color:#9aa48e;display:block;margin-top:5px}.workspace{flex:1;min-width:0;display:flex;flex-direction:column}.workspace-header{height:73px;flex-shrink:0;border-bottom:1px solid var(--line);padding:0 37px;display:flex;align-items:center;justify-content:space-between;background:#fafbf7}.workspace-header>div{display:flex;gap:12px;align-items:center;font-size:12px;color:#9aa293}.workspace-header strong{font-weight:450;color:#667160}.workspace-header>div>svg{color:#aeb5a7}.header-status{display:flex;align-items:center;gap:8px;color:#8c9882;font-size:10px;letter-spacing:.5px}.header-status i{background:#a8bc92;border-radius:50%;width:5px;height:5px}.menu-button{display:none}.service-notice{padding:10px 25px;background:#f6f0df;color:#9c8249;border-bottom:1px solid #eee5c9;text-align:center;font-size:12px;line-height:1.6}.welcome-main{flex:1;overflow-y:auto;padding:0 36px}.new-question{max-width:746px;margin:68px auto 35px}.welcome-heading .eyebrow{margin-bottom:19px}.welcome-heading h1{font-size:35px;font-family:Songti SC,"Noto Serif CJK SC",serif;font-weight:500;letter-spacing:1px;line-height:1.5;margin:0 0 13px}.welcome-heading h1 em{font-style:normal;color:var(--green)}.welcome-heading>p:last-child{font-size:13px;color:#8c9585;letter-spacing:.3px;margin-bottom:32px}.question-card{border:1px solid #dce3d4;border-radius:15px;background:var(--paper);box-shadow:0 5px 30px #33442904;overflow:hidden;transition:border-color .2s,box-shadow .2s}.question-card:focus-within{border-color:#a0b394;box-shadow:0 0 0 3px #eef2e5}.question-card.dragging{border:2px dashed var(--green);background:#eff4e7}.question-card-header{display:flex;align-items:center;justify-content:space-between;padding:19px 23px;color:#72816b;font-size:12px}.question-card-header>span:first-child{display:flex;align-items:center;gap:8px}.soft-label{font-size:10px;color:#a6ac9d}.question-card textarea{width:100%;min-height:135px;border:0;padding:10px 23px;background:transparent;color:#364a3b;line-height:1.85;font-size:14px}.question-card textarea::placeholder{color:#b4baac}.question-card-footer{display:flex;justify-content:space-between;align-items:center;padding:15px 18px;border-top:1px solid #f0f2ea}.attach-button{display:flex;gap:8px;align-items:center;font-size:12px;color:#89977c;padding:9px 8px;border-radius:6px}.attach-button:hover{background:#eff3e7}.attachment{display:flex;gap:12px;align-items:center;padding:10px;margin:0 20px 15px;background:#f4f6ef;border-radius:8px;width:fit-content;max-width:calc(100% - 40px)}.attachment img{width:46px;height:46px;object-fit:cover;border:1px solid #e0e5d5;border-radius:4px}.attachment>div{min-width:0}.attachment strong{display:block;max-width:210px;font-size:11px;font-weight:500;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.attachment span{display:block;font-size:10px;color:#98a18c;margin-top:6px}.learning-promise{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:39px 4px 0}.learning-promise>div{padding:0 18px}.learning-promise>div+div{border-left:1px solid #e4e8da}.promise-icon{width:33px;height:33px;display:grid;place-items:center;background:#eaf0e0;border-radius:10px;color:#829775}.learning-promise h3{font-size:13px;font-weight:500;margin:13px 0 9px;color:#53674e}.learning-promise p{font-size:11px;line-height:1.85;color:#98a08e}.quiet-line{margin:37px 0 0;color:#a5ad99;font-size:10px;letter-spacing:1px;display:flex;align-items:center;gap:14px;justify-content:center}.quiet-line>span{width:25px;height:1px;background:#dfe5d6}.study-layout{display:flex;flex:1;min-height:0}.chat-pane{display:flex;flex:1;min-width:0;flex-direction:column}.messages{flex:1;overflow:auto;padding:26px clamp(24px,4vw,66px) 20px;scrollbar-width:thin;scroll-behavior:auto}.message-intro{text-align:center;font-size:10px;letter-spacing:1.3px;color:#a7af9b;margin:4px 0 29px}.message{display:flex;gap:13px;margin:0 auto 28px;max-width:810px}.message-main{flex:1;min-width:0}.message-author{font-size:11px;color:#9aa38d;display:flex;gap:10px;align-items:center;min-height:28px;margin-bottom:5px}.message.user .message-main{background:#edf1e5;border-radius:0 13px 13px;padding:9px 16px 12px}.student-avatar{width:33px;height:33px;display:grid;place-items:center;flex-shrink:0;border-radius:10px;background:#e4e9dc;color:#7a8b6c;font-size:12px}.prose{font-size:14px;line-height:1.95;overflow-wrap:anywhere;color:#3f4d3e}.prose p{margin:0 0 12px}.prose p:last-child{margin-bottom:0}.prose ul,.prose ol{padding-left:21px;margin:10px 0}.prose li+li{margin-top:5px}.prose h1,.prose h2,.prose h3,.prose h4{font-size:16px;font-weight:600;line-height:1.7;margin:18px 0 10px}.prose strong{font-weight:600;color:#314c3a}.prose pre{max-width:100%;overflow:auto;padding:15px;background:#eaf0e3;border-radius:6px;font-size:12px}.prose blockquote{border-left:3px solid #b7c8a7;padding-left:15px;margin:12px 0;color:#798870}.prose table{display:block;max-width:100%;overflow:auto;border-collapse:collapse;font-size:12px}.prose td,.prose th{border:1px solid #d7dfcf;padding:6px 10px}.prose .katex-display{overflow-x:auto;overflow-y:hidden;padding:8px 0;margin:8px 0}.prose .katex{font-size:1.1em}.thinking{display:flex;align-items:center;gap:4px;height:32px;color:#a0aa95}.thinking>span{width:4px;height:4px;background:#9eaf8c;border-radius:50%;animation:blink 1.3s infinite}.thinking>span:nth-child(2){animation-delay:.2s}.thinking>span:nth-child(3){animation-delay:.4s}.thinking em{font-size:11px;font-style:normal;margin-left:7px}@keyframes blink{50%{opacity:.25}}.summary-tag{display:flex;align-items:center;gap:3px;padding:2px 7px;border-radius:6px;background:#e8efd9;color:#7d925c;font-size:10px}.chat-error{max-width:760px;margin:10px auto 20px;background:#f6eee4;border:1px solid #efdfcc;border-radius:10px;padding:13px;display:flex;gap:10px;font-size:12px;line-height:1.75;color:#987e55}.chat-error>svg{margin-top:2px}.chat-error button{display:flex;align-items:center;gap:6px;margin-top:9px;padding:4px 0;color:#805f39;text-decoration:underline;text-underline-offset:3px}.composer-area{padding:13px clamp(20px,4vw,66px) 18px;background:linear-gradient(0deg,#f7f8f4 90%,#f7f8f400)}.help-actions{display:flex;gap:8px;margin-bottom:11px;flex-wrap:wrap}.help-actions button{font-size:11px;border:1px solid #dce4d4;background:#f8faf4;padding:7px 11px;border-radius:20px;display:flex;align-items:center;gap:5px;color:#7c8d70}.help-actions button:hover:not(:disabled){background:#eaf0e1}.composer{background:#fffefb;border:1px solid #d9e1cf;box-shadow:0 2px 10px #3f552b04;border-radius:12px;display:flex;align-items:flex-end;gap:12px;padding:13px 13px 13px 17px}.composer:focus-within{border-color:#9daf8b;box-shadow:0 0 0 2px #edf3e3}.composer textarea{min-height:31px;padding:5px 0;border:0;background:transparent;flex:1;min-width:0;font-size:13px;line-height:1.7;color:#43523d}.composer textarea::placeholder{color:#a9b09f}.send-button{display:grid;place-items:center;background:var(--green);color:#fff;border-radius:9px;width:34px;height:34px;flex-shrink:0}.send-button.stop{background:#6c8060}.composer-note{display:flex;justify-content:space-between;font-size:9px;color:#a7af9b;margin:10px 2px 0}.problem-panel{width:280px;flex-shrink:0;padding:30px 23px;background:#f3f5ed;border-left:1px solid var(--line);overflow:auto}.problem-label{font-size:12px;color:#849374;display:flex;gap:7px;align-items:center;margin-bottom:21px}.problem-panel .prose{font-size:12px;line-height:2;color:#66755c}.problem-image{display:block;padding:5px;background:#fff;border:1px solid #dde4d4;border-radius:7px;margin-bottom:20px}.problem-image img{display:block;width:100%;height:auto;max-height:400px;object-fit:contain}.problem-meta{display:block;color:#adb59f;font-size:9px;padding-top:24px}.margin-note{border-top:1px solid #e0e6d6;padding-top:25px;margin-top:40px;color:#a3b28e}.margin-note p{font-family:Songti SC,serif;line-height:2;font-size:13px;color:#98a486;margin:10px 0}.mobile-question,.mobile-problem,.drawer-shade{display:none}@media(min-width:1500px){.new-question{margin-top:105px}.login-main{gap:140px}.problem-panel{width:320px}.workspace-header{height:80px}}@media(max-width:1150px){.sidebar{width:222px;padding-left:12px;padding-right:12px}.workspace-header{padding:0 25px}.problem-panel{width:230px;padding:24px 17px}.messages{padding:24px}.composer-area{padding:12px 24px 18px}.welcome-heading h1{font-size:31px}.new-question{margin-top:55px}.learning-promise{gap:4px}.login-main{gap:6vw;padding:20px 30px}.login-story h1{font-size:48px}}@media(max-width:920px){.problem-panel{display:none}.mobile-question{display:flex;gap:8px;align-items:center;border-bottom:1px solid var(--line);padding:12px 25px;font-size:11px;color:#829173}.mobile-question>span{flex:1;text-align:left}.mobile-problem{display:block;max-height:40vh;overflow:auto;background:#f0f3e9;padding:20px 25px;border-bottom:1px solid var(--line)}.mobile-problem .problem-image img{max-height:230px}.login-main{gap:40px}.login-story h1{font-size:41px}.login-card{width:330px;padding:30px}.learning-sketch{width:250px;margin-left:0}}@media(max-width:700px){.sidebar{position:fixed;left:0;top:0;bottom:0;z-index:30;width:263px;transform:translate(-100%);transition:transform .2s;box-shadow:none}.sidebar.open{transform:translate(0);box-shadow:10px 0 40px #25382018}.drawer-shade{display:block;position:fixed;inset:0;background:#25382040;z-index:20;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.menu-button{display:inline-flex}.workspace-header{height:60px;padding:0 14px}.workspace-header>div{gap:5px;font-size:11px}.header-status{font-size:9px;gap:4px}.service-notice{font-size:10px;padding:8px 16px}.welcome-main{padding:0 21px}.new-question{margin-top:43px}.welcome-heading h1{font-size:29px;line-height:1.6;margin-bottom:12px}.welcome-heading>p:last-child{font-size:11px;line-height:1.8;margin-bottom:25px}.welcome-heading .eyebrow{font-size:11px;margin-bottom:17px}.mobile-only{display:block}.question-card-header{padding:17px 15px;font-size:11px}.question-card textarea{padding:6px 16px;min-height:144px;font-size:13px}.question-card-footer{padding:12px}.primary{padding:11px 13px;font-size:12px;gap:8px}.attach-button{padding:8px 3px;font-size:11px}.learning-promise{margin-top:32px;gap:4px}.learning-promise>div{padding:0 9px}.learning-promise>div:first-child{padding-left:2px}.learning-promise h3{font-size:11px;white-space:nowrap}.learning-promise p{font-size:10px}.quiet-line{font-size:9px;letter-spacing:0;margin-top:22px;gap:7px}.quiet-line>span{width:15px}.login-brand{margin:25px;font-size:17px}.login-main{display:block;padding:20px 24px 30px;max-width:470px}.login-story .eyebrow{font-size:11px}.login-story h1{font-size:37px;line-height:1.5;margin:18px 0}.hero-description{font-size:12px;line-height:1.9;margin-bottom:28px}.learning-sketch{display:none}.login-card{width:100%;padding:26px}.login-card h2{font-size:20px}.login-card label{margin-top:21px}.login-card>p{font-size:12px}.login-footer{font-size:9px;padding:16px}.messages{padding:20px 17px}.message{gap:10px;margin-bottom:25px}.message .brand-mark.small,.student-avatar{width:29px;height:29px;border-radius:9px}.message .brand-mark.small svg{width:28px;height:28px}.message-author{font-size:10px}.prose{font-size:13px;line-height:1.95}.message.user .message-main{padding:7px 12px 11px}.composer-area{padding:10px 15px max(16px,env(safe-area-inset-bottom))}.composer-note>span:last-child{display:none}.composer-note{justify-content:center}.help-actions{gap:5px}.help-actions button{font-size:10px;padding:7px 9px}.composer{padding:10px 10px 10px 13px;gap:7px}.composer textarea{font-size:12px}.message-intro{font-size:9px;margin-bottom:22px}.problem-label{margin-bottom:12px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}.ai-disclaimer{flex-shrink:0;padding:4px 16px max(8px,env(safe-area-inset-bottom));text-align:center;font-size:12px;line-height:1.5;font-weight:400;color:#8d9686}.welcome-main{min-height:0}.user-row small{white-space:normal;line-height:1.6}.review-nav{display:flex;gap:9px;align-items:center;margin:-12px 5px 24px;padding:11px 9px;font-size:12px;color:var(--green);border-radius:8px}.review-nav:hover,.review-nav.selected{background:#e3eadb}.review-main{flex:1;min-height:0;overflow:auto;padding:40px 32px}.review-content{max-width:780px;margin:auto}.review-content h1{font-family:Songti SC,serif;font-size:32px;font-weight:500;line-height:1.5}.review-subtitle{color:var(--muted);font-size:13px;line-height:1.8;margin-bottom:30px}.review-selection,.review-topic{background:var(--paper);border:1px solid #dce3d4;border-radius:14px;padding:22px;margin:18px 0}.review-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;color:#7b8774}.review-toolbar select{border:1px solid #dce3d4;border-radius:7px;padding:7px;background:var(--paper);color:var(--green);font:inherit}.review-question-list{max-height:340px;overflow:auto;margin:18px 0;border-block:1px solid var(--line)}.review-question{display:flex;align-items:flex-start;gap:12px;padding:15px 2px;font-size:13px;line-height:1.7;cursor:pointer}.review-question+.review-question{border-top:1px solid var(--line)}.review-question input{accent-color:var(--green);margin-top:5px;flex-shrink:0}.review-question span{min-width:0;overflow-wrap:anywhere}.review-question small,.review-saved small{display:block;color:var(--muted);font-size:11px;margin-top:5px}.review-link{display:inline-flex;align-items:center;gap:4px;font-size:12px;color:var(--green);padding:5px 0}.review-topic h2{font-size:19px;line-height:1.7;font-weight:550;color:var(--green);margin-bottom:20px;overflow-wrap:anywhere}.review-point+.review-point{border-top:1px solid var(--line);margin-top:20px;padding-top:20px}.review-point-tools{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-top:14px}.review-point-tools details{flex:1;min-width:0}.review-point-tools>button{flex-shrink:0;color:#89917f}.review-point-tools summary,.review-sources summary{font-size:12px;cursor:pointer;color:#7e8c73;padding:5px 0}.review-evidence{background:#f1f4eb;padding:13px;margin-top:10px;border-radius:8px;overflow-wrap:anywhere}.review-evidence small{color:var(--muted);font-size:11px}.review-evidence blockquote{margin:10px 0;font-size:13px;line-height:1.8;white-space:pre-wrap}.review-feedback{background:#f3f5ef;padding:15px;border-radius:10px;margin-top:14px;font-size:12px}.review-feedback textarea{display:block;width:100%;min-height:80px;border:1px solid #dce3d4;border-radius:6px;padding:10px;margin-top:8px;background:var(--paper)}.review-feedback p{color:var(--muted);line-height:1.7;font-size:11px;margin:10px 0}.review-feedback>div{display:flex;justify-content:flex-end;gap:12px}.review-sources{margin:24px 0}.review-source-link,.review-saved>button{display:flex;width:100%;gap:12px;align-items:center;justify-content:space-between;text-align:left;border-bottom:1px solid var(--line);padding:14px 0;font-size:13px;line-height:1.7}.review-source-link span,.review-saved>button>span{overflow-wrap:anywhere;min-width:0}.review-saved{margin-top:34px}.review-saved h2{font-size:14px;font-weight:500;color:#7a876f}.review-filters{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.review-filters button{padding:7px 12px;border:1px solid var(--line);border-radius:18px;font-size:12px}.review-filters .chosen{background:#e4ecd9;color:var(--green)}.review-update{display:flex;align-items:center;justify-content:space-between;gap:15px;font-size:12px;background:#edf2e4;padding:14px;border-radius:8px;margin:15px 0;line-height:1.7}.review-update button{color:var(--green);white-space:nowrap}.review-stop{margin:12px 0}.source-highlight{outline:2px solid #a8bc92;outline-offset:7px;border-radius:8px}.review-point-tools .review-action{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:9px 13px;border:1px solid #b8c7b2;border-radius:8px;background:#f1f5ec;box-shadow:0 1px 2px #284f3e0c;color:var(--green);font-size:13px;font-weight:500;line-height:1.5;white-space:nowrap;cursor:pointer;list-style:none;transition:background .15s,border-color .15s,box-shadow .15s}.review-point-tools summary.review-action::-webkit-details-marker{display:none}.review-point-tools .review-action:hover:not(:disabled){background:#e4eddd;border-color:#8ba581;box-shadow:0 2px 4px #284f3e14}.review-point-tools .review-action:focus-visible{outline:2px solid var(--green);outline-offset:3px}.review-point-tools .review-action:active:not(:disabled){background:#dce8d4;box-shadow:none}.review-point-tools details[open]>summary.review-action,.review-point-tools .review-action[aria-expanded=true]{background:#e4eddd;border-color:#8ba581}.review-action-chevron{transition:transform .15s}.review-point-tools details[open] .review-action-chevron{transform:rotate(180deg)}.review-point-tools .review-action:disabled{cursor:not-allowed;opacity:.5}@media(max-width:700px){.review-main{padding:27px 19px}.review-content h1{font-size:27px}.review-selection,.review-topic{padding:17px}.review-toolbar{font-size:11px}.review-point-tools{gap:10px;flex-wrap:wrap}.review-point-tools .review-action{padding:9px 10px}.review-topic h2{font-size:17px}.review-question-list{max-height:280px}}.brand-mark img{width:100%;height:100%;object-fit:contain}.brand-mark:has(img){background:transparent}.invite-page{max-width:1040px;margin:auto;padding:48px 24px 24px;min-height:100dvh;overflow:auto}.invite-brand{display:flex;align-items:center;gap:14px;font-size:28px;font-weight:700}.invite-brand img{width:64px;height:64px}.invite-brand small{display:block;font-size:12px;font-weight:400;color:#77856e;letter-spacing:2px}.invite-page h1{font-size:clamp(27px,4vw,44px);line-height:1.5;margin:32px 0 12px;color:#285b46}.muted{color:#697663;font-size:13px;line-height:1.8}.access-card{background:#fffefa;border:1px solid #d7dfcc;border-radius:18px;padding:28px;min-width:0}.invite-page>.access-card{margin:26px 0;max-width:580px}.access-card h2{font-size:20px;margin:0 0 20px}.access-card h3{font-size:16px}.access-card label{display:block;font-size:14px;margin:14px 0;color:#43543b}.access-card input:not([type=checkbox]),.access-card select,.access-card textarea{display:block;width:100%;box-sizing:border-box;margin-top:8px;border:1px solid #cdd7c4;border-radius:9px;background:#fff;padding:12px;font:inherit;color:#28382b}.access-card input:focus,.access-card textarea:focus{outline:2px solid #829f6f;outline-offset:2px}.access-card .check-label{display:flex;align-items:flex-start;gap:10px;line-height:1.6}.check-label input{margin-top:5px;flex-shrink:0}.contact-box{padding:18px;background:#f0f4e8;border-radius:12px;margin:20px 0;line-height:1.7;overflow-wrap:anywhere}.contact-box p{margin:10px 0}.contact-box small{font-size:12px;color:#596a50}.outline-button,.account-button{border:1px solid #bdcdb3;background:#f8faf4;color:#375731;border-radius:9px;min-height:42px;padding:9px 14px;cursor:pointer;font:inherit;font-size:13px;display:inline-flex;align-items:center;justify-content:center;gap:8px;margin:4px 6px 4px 0}.outline-button:hover,.account-button:hover{background:#eaf0df}.outline-button:disabled,.account-button:disabled{opacity:.5;cursor:default}.account-button{width:100%;margin-top:14px}.brand-benefits{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin:32px 0}.brand-benefits h3{font-size:16px;color:#385b3f}.brand-benefits p{font-size:14px;color:#6b7963;line-height:1.85}.access-overlay{position:fixed;inset:0;background:#132e245c;z-index:100;display:flex;align-items:flex-start;justify-content:center;padding:40px 18px;overflow:auto}.access-overlay>.access-card{width:min(100%,620px);margin:auto}.customer-id{overflow-wrap:anywhere}.grant-list{max-height:450px;overflow:auto}.grant-list>div{padding:16px 0;border-bottom:1px solid #dce3d4;line-height:1.7;font-size:14px;overflow-wrap:anywhere}.grant-list p{margin:8px 0}.grant-list small{color:#718267}.admin-page{padding:32px;max-width:1400px;margin:auto;min-height:100dvh;overflow:auto}.admin-header{display:flex;align-items:center;gap:24px;margin-bottom:28px}.admin-header>div{flex:1}.admin-header h1{font-size:25px}.admin-login{max-width:500px;margin:10vh auto}.admin-login>a{display:block;margin-top:20px}.admin-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:24px;align-items:start}.admin-grid .access-card{height:100%}.customer-list{max-height:550px;overflow:auto;margin-top:12px}.customer-button{display:flex;flex-direction:column;gap:9px;text-align:left;width:100%;border:1px solid #d9e2d0;background:#fafff5;border-radius:10px;padding:16px;margin:8px 0;cursor:pointer;color:#365536}.customer-button.selected{background:#e1eccf;border-color:#819f6d}.customer-button small{font-size:11px;overflow-wrap:anywhere}.customer-detail{margin-top:24px}.customer-detail details{margin-top:30px;overflow-wrap:anywhere;max-height:500px;overflow:auto}.customer-detail summary{cursor:pointer;padding:12px;background:#f1f4ec;border-radius:8px}.customer-detail code{font-size:12px;overflow-wrap:anywhere}.form-row{display:flex;gap:12px}.form-row>label{flex:1;min-width:0}.admin-actions{display:flex;gap:6px;flex-wrap:wrap}.success-text{padding:14px;background:#e6f0da;color:#36582e;border-radius:8px}.issued-codes{margin-bottom:24px}.service-notice .outline-button{margin-left:14px}@media(max-width:720px){.invite-page{padding:26px 18px}.access-card{padding:20px}.admin-page{padding:18px}.admin-header{flex-wrap:wrap;gap:12px}.admin-header>div{flex-basis:100%}.admin-grid,.brand-benefits{grid-template-columns:1fr}.brand-benefits{gap:8px}.access-overlay{padding:15px}.form-row{flex-wrap:wrap}.admin-header h1{font-size:22px}}.sidebar-bottom .account-button{width:auto;min-height:32px;padding:4px 0;margin:4px 0 12px;border:0;background:transparent;font-size:12px;color:#687c60;justify-content:flex-start}.sidebar-bottom .account-button:hover{background:transparent;color:var(--green);text-decoration:underline;text-underline-offset:4px}.inline-access-button{display:inline-flex;align-items:center;min-height:36px;margin-left:10px;padding:4px 10px;border:1px solid #b5c6ab;border-radius:7px;background:#f3f7ec;color:var(--green);font-size:13px;text-decoration:underline;text-underline-offset:3px}.inline-access-button:hover{background:#e7efdc}.trial-notice{margin:0 0 12px;font-size:13px;line-height:1.8;color:#526b48}.trial-notice .inline-access-button{min-height:44px}.new-question>.question-card{padding-top:12px}.question-card textarea{display:block;min-height:96px;max-height:240px;padding:8px 23px 12px;font-size:16px;line-height:1.6;resize:none;overflow-y:auto}.question-card textarea::placeholder{color:#85917d}.question-card .attach-button{min-height:44px;padding:10px 15px;gap:8px;border:1px solid #aebfa2;background:#edf3e5;color:#375b43;font-size:14px;font-weight:500;border-radius:9px;white-space:nowrap}.question-card .attach-button:hover:not(:disabled){background:#e0ebd5;border-color:#829d73}.question-card .attach-button:focus-visible{outline:2px solid var(--green);outline-offset:3px}.question-card .attach-button:disabled{opacity:.55;cursor:not-allowed}.question-card-footer{gap:12px}.question-card-footer>.primary{min-height:44px;white-space:nowrap}.question-card .attachment{width:auto}.question-card .attachment>div{flex:1}.question-card .attachment strong{max-width:100%}.question-card .attachment img{width:80px;height:64px;object-fit:contain;background:#fff}.question-card .attachment .icon-button{flex-shrink:0;min-width:44px;min-height:44px}@media(max-width:700px){.question-card textarea{padding:8px 16px 12px}.question-card .attach-button{padding:10px 12px;font-size:14px}.question-card .attachment{margin:0 12px 12px;max-width:calc(100% - 24px);gap:8px}.question-card .attachment img{width:60px;height:60px}.question-card-footer{gap:8px}.question-card-footer>.primary{font-size:14px;padding:10px 12px}}.institution-metrics{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}.institution-metrics>div{background:#f0f5e9;padding:18px;border-radius:12px}.institution-metrics small{display:block;color:#62745a;font-size:12px}.institution-metrics strong{display:block;font-size:25px;margin-top:10px;color:#2d5840}.institution-metrics span{font-size:12px;font-weight:400}.institution-grant{padding:18px 0;border-bottom:1px solid #d7dfcc;overflow-wrap:anywhere}.admin-page>.access-card{margin-bottom:24px}.admin-page p{line-height:1.7}.admin-page a{overflow-wrap:anywhere}@media(max-width:720px){.institution-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.institution-metrics>div{padding:12px}}.platform-parents{margin-top:24px;scroll-margin-top:20px}.parent-table{max-height:550px;overflow:auto}.parent-table-heading,.parent-table-row{display:grid;grid-template-columns:2fr 1.2fr 1fr 1fr 1fr;gap:15px;align-items:center;padding:16px 10px;border-bottom:1px solid #dce3d4;font-size:14px}.parent-table-heading{position:sticky;top:0;background:#eff4e8;color:#506446;z-index:1}.parent-table-row>div,.parent-table-row>span{min-width:0;overflow-wrap:anywhere}.parent-table-row small{display:block;font-size:11px;color:#76876b;margin-top:8px;overflow-wrap:anywhere}.institution-add-quota{background:#f1f6e9;border-radius:12px;padding:20px;margin-top:20px}.institution-add-quota label{max-width:600px}.new-institution>summary{cursor:pointer;font-size:18px;font-weight:600;min-height:44px;padding:8px}.institution-maintenance{padding-top:12px}#org-actions{scroll-margin-top:20px}@media(max-width:720px){.parent-table-heading{display:none}.parent-table-row{grid-template-columns:1fr 1fr;gap:12px}.parent-table-row>div{grid-column:1/-1}.parent-table-row span:before{content:attr(data-label) "：";color:#718366;font-size:12px}}