@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/ai/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2) format("woff2"),url(/ai/assets/KaTeX_AMS-Regular-DMm9YOAa.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2) format("woff2"),url(/ai/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2) format("woff2"),url(/ai/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2) format("woff2"),url(/ai/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2) format("woff2"),url(/ai/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Main-Bold-Cx986IdX.woff2) format("woff2"),url(/ai/assets/KaTeX_Main-Bold-Jm3AIy58.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2) format("woff2"),url(/ai/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2) format("woff2"),url(/ai/assets/KaTeX_Main-Italic-BMLOBm91.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Main-Regular-B22Nviop.woff2) format("woff2"),url(/ai/assets/KaTeX_Main-Regular-Dr94JaBh.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2) format("woff2"),url(/ai/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Math-Italic-t53AETM-.woff2) format("woff2"),url(/ai/assets/KaTeX_Math-Italic-DA0__PXp.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2) format("woff2"),url(/ai/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2) format("woff2"),url(/ai/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2) format("woff2"),url(/ai/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Script-Regular-D3wIWfF6.woff2) format("woff2"),url(/ai/assets/KaTeX_Script-Regular-D5yQViql.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2) format("woff2"),url(/ai/assets/KaTeX_Size1-Regular-C195tn64.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2) format("woff2"),url(/ai/assets/KaTeX_Size2-Regular-oD1tc_U0.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Size3-Regular-CTq5MqoE.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2) format("woff2"),url(/ai/assets/KaTeX_Size4-Regular-BF-4gkZK.woff) format("woff"),url(/ai/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(/ai/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2) format("woff2"),url(/ai/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff) format("woff"),url(/ai/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf) format("truetype")}.katex{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;position:relative;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.18.4"}.katex .katex-mathml{border:0;-webkit-clip-path:inset(50%);clip-path:inset(50%);height:1px;overflow:hidden;padding:0;position:absolute;width:1px}.katex .katex-html>.katex-newline{display:block}.katex .katex-base{position:relative;white-space:nowrap;width:-webkit-min-content;width:-moz-min-content;width:min-content}.katex .katex-base,.katex .katex-strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;display:inline-table;table-layout:fixed}.katex .vlist-r{display:table-row}.katex .vlist{display:table-cell;position:relative;vertical-align:bottom}.katex .vlist>span{display:block;height:0;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{overflow:hidden;width:0}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{display:table-cell;font-size:1px;min-width:2px;vertical-align:bottom;width:2px}.katex .katex-vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .katex-thinbox{display:inline-flex;flex-direction:row;max-width:0;width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .katex-hdashline,.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-rule,.katex .katex-underline .underline-line,.katex .mfrac .frac-line{min-height:1px}.katex .mspace{display:inline-block}.katex .katex-smash{display:inline;line-height:0}.katex .clap,.katex .llap,.katex .rlap{position:relative;width:0}.katex .clap>.katex-inner,.katex .llap>.katex-inner,.katex .rlap>.katex-inner{position:absolute}.katex .clap>.katex-fix,.katex .llap>.katex-fix,.katex .rlap>.katex-fix{display:inline-block}.katex .llap>.katex-inner{right:0}.katex .clap>.katex-inner,.katex .rlap>.katex-inner{left:0}.katex .clap>.katex-inner>span{margin-left:-50%;margin-right:50%}.katex .katex-rule{border:0 solid;display:inline-block;position:relative}.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-underline .underline-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .katex-hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.katex-root{margin-left:.2777777778em;margin-right:-.5555555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .katex-sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .katex-sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .katex-sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .katex-sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .katex-sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .katex-sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .katex-sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .katex-sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .katex-sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .katex-sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .katex-sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .katex-sizing.reset-size2.size1{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .katex-sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .katex-sizing.reset-size2.size3{font-size:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .katex-sizing.reset-size2.size4{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .katex-sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .katex-sizing.reset-size2.size6{font-size:1.6666666667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .katex-sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .katex-sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .katex-sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .katex-sizing.reset-size2.size10{font-size:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .katex-sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .katex-sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .katex-sizing.reset-size3.size2{font-size:.8571428571em}.katex .fontsize-ensurer.reset-size3.size3,.katex .katex-sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .katex-sizing.reset-size3.size4{font-size:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .katex-sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .katex-sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .katex-sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .katex-sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .katex-sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .katex-sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .katex-sizing.reset-size3.size11{font-size:3.5542857143em}.katex .fontsize-ensurer.reset-size4.size1,.katex .katex-sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .katex-sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .katex-sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .katex-sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .katex-sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .katex-sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .katex-sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .katex-sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .katex-sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .katex-sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .katex-sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .katex-sizing.reset-size5.size1{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .katex-sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .katex-sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .katex-sizing.reset-size5.size4{font-size:.8888888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .katex-sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .katex-sizing.reset-size5.size6{font-size:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .katex-sizing.reset-size5.size7{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .katex-sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .katex-sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .katex-sizing.reset-size5.size10{font-size:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .katex-sizing.reset-size5.size11{font-size:2.7644444444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .katex-sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .katex-sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .katex-sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .katex-sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .katex-sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .katex-sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .katex-sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .katex-sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .katex-sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .katex-sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .katex-sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .katex-sizing.reset-size7.size1{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .katex-sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .katex-sizing.reset-size7.size3{font-size:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .katex-sizing.reset-size7.size4{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .katex-sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .katex-sizing.reset-size7.size6{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .katex-sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .katex-sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .katex-sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .katex-sizing.reset-size7.size10{font-size:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .katex-sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .katex-sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .katex-sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .katex-sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .katex-sizing.reset-size8.size4{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .katex-sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .katex-sizing.reset-size8.size6{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .katex-sizing.reset-size8.size7{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .katex-sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .katex-sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .katex-sizing.reset-size8.size10{font-size:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .katex-sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .katex-sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .katex-sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .katex-sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .katex-sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .katex-sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .katex-sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .katex-sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .katex-sizing.reset-size9.size8{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .katex-sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .katex-sizing.reset-size9.size10{font-size:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .katex-sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .katex-sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .katex-sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .katex-sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .katex-sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .katex-sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .katex-sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .katex-sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .katex-sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .katex-sizing.reset-size10.size9{font-size:.8331726133em}.katex .fontsize-ensurer.reset-size10.size10,.katex .katex-sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .katex-sizing.reset-size10.size11{font-size:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .katex-sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .katex-sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .katex-sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .katex-sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .katex-sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .katex-sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .katex-sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .katex-sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .katex-sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .katex-sizing.reset-size11.size10{font-size:.8336012862em}.katex .fontsize-ensurer.reset-size11.size11,.katex .katex-sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{display:inline-block;width:.12em}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .katex-accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .katex-accent .accent-body{position:relative}.katex .katex-accent .accent-body:not(.accent-full){width:0}.katex .katex-overlay{display:block}.katex .mtable .vertical-separator{display:inline-block;min-width:1px}.katex .mtable .arraycolsep{display:inline-block}.katex .mtable .col-align-c>.vlist-t{text-align:center}.katex .mtable .col-align-l>.vlist-t{text-align:left}.katex .mtable .col-align-r>.vlist-t{text-align:right}.katex .svg-align{text-align:left}.katex svg{fill:currentColor;stroke:currentColor;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;max-height:none;max-width:none;min-height:0;min-width:0}.katex .katex-stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .katex-stretchy:after,.katex .katex-stretchy:before{content:""}.katex .hide-tail{overflow:hidden;position:relative;width:100%}.katex .halfarrow-left{left:0;overflow:hidden;position:absolute;width:50.2%}.katex .halfarrow-right{overflow:hidden;position:absolute;right:0;width:50.2%}.katex .brace-left{left:0;overflow:hidden;position:absolute;width:25.1%}.katex .brace-center{left:25%;overflow:hidden;position:absolute;width:50%}.katex .brace-right{overflow:hidden;position:absolute;right:0;width:25.1%}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{border:.04em solid;box-sizing:border-box}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .katex-sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{border-right:.049em solid;border-top:.049em solid;box-sizing:border-box;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.katex-tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.katex-tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}:root{--font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;--page: 1160px;--gutter: 24px;--r-sm: 10px;--r-md: 14px;--r-lg: 18px;--r-xl: 24px;--ease: cubic-bezier(.2, .7, .3, 1)}:root,:root[data-theme=light]{color-scheme:light;--bg: #f4f6fb;--bg-blur: rgba(244, 246, 251, .82);--surface: #ffffff;--surface-2: #f8fafd;--surface-3: #eef1f7;--border: #e4e8f0;--border-strong: #d3dae6;--ink: #0f1626;--ink-2: #38415a;--muted: #5d6880;--faint: #8a93a8;--accent: #4f46e5;--accent-ink: #4038c4;--accent-soft: #eeefff;--accent-line: #d9d8ff;--accent-2: #0ea5e9;--success: #0b7d55;--success-soft: #e6f6ef;--success-line: #c3e8d8;--warn: #a35c06;--warn-soft: #fdf3e4;--warn-line: #f2ddba;--danger: #c33b3b;--danger-soft: #fdeded;--danger-line: #f3cccc;--grid-line: rgba(15, 22, 38, .05);--glow-1: rgba(79, 70, 229, .16);--glow-2: rgba(14, 165, 233, .13);--shadow-sm: 0 1px 2px rgba(15, 22, 38, .04), 0 1px 3px rgba(15, 22, 38, .05);--shadow-md: 0 4px 10px -3px rgba(15, 22, 38, .07), 0 14px 30px -12px rgba(15, 22, 38, .12);--shadow-lg: 0 20px 50px -16px rgba(15, 22, 38, .2);--shadow-accent: 0 8px 20px -8px rgba(79, 70, 229, .55)}:root[data-theme=dark]{color-scheme:dark;--bg: #080b14;--bg-blur: rgba(8, 11, 20, .78);--surface: #111826;--surface-2: #161e2f;--surface-3: #1d2639;--border: #212b3f;--border-strong: #2f3a52;--ink: #e9eef8;--ink-2: #c4cddf;--muted: #99a3ba;--faint: #79839b;--accent: #7b7bf7;--accent-ink: #a9a8ff;--accent-soft: #1a1c38;--accent-line: #2f3168;--accent-2: #38bdf8;--success: #4ecfa0;--success-soft: #10241d;--success-line: #1d4438;--warn: #e8ab54;--warn-soft: #2a1f0f;--warn-line: #4a3718;--danger: #f08a8a;--danger-soft: #2a1517;--danger-line: #4d2529;--grid-line: rgba(255, 255, 255, .045);--glow-1: rgba(99, 91, 255, .2);--glow-2: rgba(56, 189, 248, .14);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 6px 16px -6px rgba(0, 0, 0, .6), 0 18px 40px -20px rgba(0, 0, 0, .8);--shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, .85);--shadow-accent: 0 8px 22px -10px rgba(99, 91, 255, .75)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;min-width:320px;background:var(--bg);color:var(--ink);font-family:var(--font-sans);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;transition:background-color .25s ease,color .25s ease}a{color:inherit;text-decoration:none}h1,h2,h3,h4{margin:0;font-weight:700;color:var(--ink);letter-spacing:-.01em;line-height:1.35}p{margin:0}button{font:inherit;color:inherit}::selection{background:var(--accent);color:#fff}:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}::-webkit-scrollbar{width:11px;height:11px}::-webkit-scrollbar-thumb{background:var(--border-strong);border:3px solid var(--bg);border-radius:999px}::-webkit-scrollbar-thumb:hover{background:var(--faint)}::-webkit-scrollbar-track{background:var(--bg)}.site-shell{display:flex;min-height:100vh;flex-direction:column}main{flex:1;width:100%;max-width:var(--page);margin:0 auto;padding:0 var(--gutter) 80px}.muted-note{color:var(--muted);font-size:14px;line-height:1.8}.muted-note a{color:var(--accent-ink);font-weight:600}.muted-note a:hover{text-decoration:underline}.read-progress{position:fixed;inset:0 0 auto;z-index:60;height:3px;transform:scaleX(var(--p, 0));transform-origin:left;background:linear-gradient(90deg,var(--accent),var(--accent-2))}.topbar{position:sticky;top:0;z-index:50;background:var(--bg-blur);backdrop-filter:blur(14px) saturate(160%);-webkit-backdrop-filter:blur(14px) saturate(160%);border-bottom:1px solid transparent;transition:border-color .22s ease,box-shadow .22s ease}.topbar.is-scrolled{border-bottom-color:var(--border);box-shadow:0 1px 20px -8px #0f16262e}.topbar-inner{display:flex;align-items:center;gap:18px;max-width:var(--page);height:66px;margin:0 auto;padding:0 var(--gutter)}.brand{display:flex;align-items:center;gap:11px;margin-right:auto}.brand-mark{display:grid;flex:none;place-items:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:var(--shadow-accent);color:#fff;font:800 14px/1 var(--font-mono);letter-spacing:-.03em}.brand-text strong{display:block;font-size:15px;letter-spacing:0}.brand-text small{display:block;margin-top:1px;color:var(--faint);font-size:11px}.nav{display:flex;gap:4px}.nav a{padding:8px 14px;border-radius:var(--r-sm);color:var(--muted);font-size:14px;font-weight:500;white-space:nowrap;transition:background-color .18s ease,color .18s ease}.nav a:hover{background:var(--surface-3);color:var(--ink)}.nav a.active{background:var(--accent-soft);color:var(--accent-ink);font-weight:600}.icon-button{display:grid;flex:none;place-items:center;width:38px;height:38px;border:1px solid var(--border);border-radius:11px;background:var(--surface);color:var(--muted);cursor:pointer;transition:color .18s ease,border-color .18s ease,transform .18s ease}.icon-button:hover{border-color:var(--border-strong);color:var(--ink);transform:translateY(-1px)}.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border:1px solid transparent;border-radius:12px;font-size:14px;font-weight:600;white-space:nowrap;cursor:pointer;transition:transform .18s var(--ease),box-shadow .18s ease,background-color .18s ease,border-color .18s ease,color .18s ease}.btn:disabled{cursor:not-allowed;opacity:.55}.btn:not(:disabled):active{transform:translateY(0)}.btn-primary{background:linear-gradient(135deg,var(--accent),#6f5df6);box-shadow:var(--shadow-accent);color:#fff}.btn-primary:not(:disabled):hover{transform:translateY(-1px);box-shadow:0 12px 26px -10px #4f46e5b3}.btn-ghost{border-color:var(--border-strong);background:var(--surface);color:var(--ink)}.btn-ghost:hover{border-color:var(--accent);color:var(--accent-ink);transform:translateY(-1px)}.btn-quiet{padding:9px 14px;background:transparent;border-color:transparent;color:var(--muted)}.btn-quiet:hover{background:var(--surface-3);color:var(--ink)}.btn-sm{padding:7px 12px;font-size:13px}.arrow-link{display:inline-flex;align-items:center;gap:6px;color:var(--accent-ink);font-size:13.5px;font-weight:600}.arrow-link svg{transition:transform .2s var(--ease)}.card:hover .arrow-link svg{transform:translate(4px)}.external-link{display:inline-flex;align-items:center;gap:5px;color:var(--muted);font-size:13px;font-weight:600;transition:color .18s ease}.external-link:hover{color:var(--accent-ink)}.external-link svg{transition:transform .2s var(--ease)}.external-link:hover svg{transform:translate(2px,-2px)}.back-link{display:inline-flex;align-items:center;gap:6px;margin-bottom:26px;color:var(--muted);font-size:13.5px;font-weight:600}.back-link svg{transform:rotate(180deg);transition:transform .2s var(--ease)}.back-link:hover{color:var(--accent-ink)}.back-link:hover svg{transform:rotate(180deg) translate(3px)}.tag-row{display:flex;flex-wrap:wrap;gap:6px}.tag{display:inline-flex;padding:4px 9px;border-radius:999px;background:var(--surface-3);color:var(--muted);font-size:11.5px;font-weight:500;white-space:nowrap}.pill{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border:1px solid var(--border);border-radius:999px;background:var(--surface-3);color:var(--muted);font-size:12px;font-weight:600;white-space:nowrap}.pill-open{border-color:var(--accent-line);background:var(--accent-soft);color:var(--accent-ink)}.pill-live{border-color:var(--warn-line);background:var(--warn-soft);color:var(--warn)}.pill-closed{border-color:var(--border);background:var(--surface-3);color:var(--faint)}.chip{padding:7px 13px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--muted);font-size:13px;cursor:pointer;transition:all .16s ease}.chip:hover{border-color:var(--border-strong);color:var(--ink)}.chip-active{border-color:transparent;background:var(--ink);color:var(--bg);font-weight:600}.filter-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}.micro-badge{display:inline-flex;align-items:center;gap:4px;color:var(--faint);font-size:11.5px;font-weight:500}.count-badge{display:inline-flex;align-items:center;padding:5px 12px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--muted);font-size:12.5px;font-variant-numeric:tabular-nums}.card{position:relative;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface);box-shadow:var(--shadow-sm);transition:transform .24s var(--ease),box-shadow .24s ease,border-color .24s ease}a.card:hover{transform:translateY(-3px);border-color:var(--border-strong);box-shadow:var(--shadow-md)}.hero{position:relative;isolation:isolate;padding:78px 0 44px}.hero-inner{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:60px;align-items:center}.hero:before{content:"";position:absolute;z-index:-1;inset:-180px -30% auto -30%;height:620px;background:radial-gradient(46% 55% at 26% 42%,var(--glow-1),transparent 70%),radial-gradient(40% 50% at 74% 26%,var(--glow-2),transparent 70%);pointer-events:none}.hero:after{content:"";position:absolute;z-index:-1;inset:-80px -30% auto -30%;height:560px;background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:58px 58px;-webkit-mask-image:radial-gradient(58% 62% at 34% 44%,#000 0%,transparent 72%);mask-image:radial-gradient(58% 62% at 34% 44%,#000 0%,transparent 72%);pointer-events:none}.eyebrow-chip{display:inline-flex;align-items:center;gap:8px;padding:6px 14px 6px 11px;border:1px solid var(--border);border-radius:999px;background:var(--surface);box-shadow:var(--shadow-sm);color:var(--muted);font:600 11.5px/1 var(--font-mono);letter-spacing:.1em}.pulse-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 2.4s ease-out infinite}@keyframes pulse{0%{box-shadow:0 0 #4f46e573}70%,to{box-shadow:0 0 0 8px #4f46e500}}.hero h1{max-width:17em;margin:24px 0 0;font-size:clamp(32px,5.2vw,58px);font-weight:800;line-height:1.22;letter-spacing:-.015em}.grad-text{background:linear-gradient(100deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}.hero-lead{max-width:620px;margin:20px 0 0;color:var(--muted);font-size:16.5px;line-height:1.9}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}.hv-card{padding:20px;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--surface);box-shadow:var(--shadow-lg)}.hv-head{display:flex;align-items:center;gap:11px;padding-bottom:16px;margin-bottom:8px;border-bottom:1px solid var(--border)}.hv-badge{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}.hv-head strong{display:block;font-size:14px}.hv-head small{display:block;margin-top:2px;color:var(--faint);font-size:12px}.hv-steps{display:grid;gap:2px;margin:0;padding:0;list-style:none;counter-reset:hv}.hv-steps li{position:relative}.hv-steps li:not(:last-child):before{content:"";position:absolute;left:25px;top:40px;bottom:4px;width:2px;background:var(--border)}.hv-steps a{position:relative;display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--r-md);color:var(--faint);transition:background-color .18s ease,color .18s ease}.hv-steps a:hover{background:var(--surface-3);color:var(--accent-ink)}.hv-num{display:grid;flex:none;place-items:center;width:26px;height:26px;border:1px solid var(--accent-line);border-radius:50%;background:var(--accent-soft);color:var(--accent-ink);font:700 12px/1 var(--font-mono)}.hv-text{min-width:0;flex:1}.hv-text strong{display:block;color:var(--ink);font-size:14px}.hv-text small{display:block;margin-top:1px;color:var(--faint);font-size:12px}.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:48px}.stat{position:relative;overflow:hidden;padding:22px 24px 24px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface);box-shadow:var(--shadow-sm)}.stat:after{content:"";position:absolute;left:0;bottom:0;width:100%;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent-2));opacity:.85}.stat-icon{position:absolute;top:20px;right:20px;display:grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--surface-3);color:var(--faint)}.stat-value{display:block;font-size:34px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums;line-height:1.1}.stat-label{display:block;margin-top:4px;font-size:14px;font-weight:600}.stat-hint{display:block;margin-top:3px;color:var(--faint);font-size:12.5px}.section-block{padding:64px 0 0}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:26px}.section-action{flex:none}.eyebrow{display:inline-flex;align-items:center;gap:6px;color:var(--accent-ink);font:700 11.5px/1 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.section-head h2{margin:12px 0 0;font-size:clamp(23px,2.9vw,32px)}.section-head p{max-width:620px;margin:9px 0 0;color:var(--muted);font-size:15px;line-height:1.8}.page{padding:44px 0 0}.page-header{margin-bottom:30px}.page-header h1{margin:12px 0 0;font-size:clamp(28px,4.2vw,42px);font-weight:800;line-height:1.25}.page-header p{max-width:640px;margin:12px 0 0;color:var(--muted);font-size:15.5px;line-height:1.85}.page-header-meta{margin-top:16px}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature-card{overflow:hidden;padding:26px}.feature-num{position:absolute;top:6px;right:18px;color:var(--ink);font:800 58px/1 var(--font-mono);opacity:.05;pointer-events:none}.feature-icon{display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--accent-line);border-radius:13px;background:var(--accent-soft);color:var(--accent-ink);transition:transform .24s var(--ease)}a.card:hover .feature-icon{transform:scale(1.06) rotate(-3deg)}.feature-card h3{margin:20px 0 8px;font-size:19px}.feature-card p{color:var(--muted);font-size:14.5px;line-height:1.8}.feature-card .arrow-link{margin-top:18px}.news-preview{display:grid;gap:10px}.news-row{display:grid;grid-template-columns:106px minmax(0,1fr) auto;align-items:center;gap:18px;padding:16px 20px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface);transition:border-color .18s ease,background-color .18s ease,transform .18s var(--ease)}.news-row:hover{transform:translate(3px);border-color:var(--accent-line);background:var(--surface-2)}.news-row-date{color:var(--faint);font:500 12.5px/1 var(--font-mono);white-space:nowrap}.news-row-title{overflow:hidden;color:var(--ink);font-size:15px;font-weight:600;line-height:1.6;text-overflow:ellipsis;white-space:nowrap}.news-row-source{display:inline-flex;align-items:center;gap:5px;color:var(--faint);font-size:12.5px;white-space:nowrap}.news-row:hover .news-row-source{color:var(--accent-ink)}.deadline-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px}.deadline-card{display:block;padding:20px 22px}.deadline-top{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}.deadline-card h3{font-size:16.5px;line-height:1.55}.deadline-card p{margin:6px 0 14px;color:var(--muted);font-size:13.5px}.cta-band{display:flex;align-items:center;justify-content:space-between;gap:28px;margin-top:72px;padding:38px 40px;border:1px solid var(--accent-line);border-radius:var(--r-xl);background:linear-gradient(120deg,var(--accent-soft),var(--surface) 62%);box-shadow:var(--shadow-sm)}.cta-band h2{margin:12px 0 0;font-size:clamp(22px,2.6vw,28px)}.cta-band p{margin:8px 0 0;color:var(--muted);font-size:15px;line-height:1.8}.cta-actions{display:flex;flex-wrap:wrap;gap:12px}.stack{display:grid;gap:14px}.news-card{padding:24px 26px}.card-meta{display:flex;align-items:center;justify-content:space-between;gap:14px;color:var(--faint);font-size:12.5px}.source-name{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-weight:600}.news-card h2{margin:12px 0 10px;font-size:19.5px;line-height:1.55}.news-card h2 a:hover{color:var(--accent-ink)}.news-card p{color:var(--ink-2);font-size:14.5px;line-height:1.85}.card-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}.timeline{position:relative;display:grid;gap:18px;padding-left:30px}.timeline:before{content:"";position:absolute;left:5px;top:14px;bottom:30px;width:2px;border-radius:2px;background:linear-gradient(var(--border-strong),transparent)}.timeline-item{position:relative}.timeline-item:before{content:"";position:absolute;left:-30px;top:26px;width:12px;height:12px;border:2px solid var(--accent);border-radius:50%;background:var(--bg);box-shadow:0 0 0 4px var(--bg)}.timeline-item.tone-closed:before{border-color:var(--border-strong)}.timeline-item.tone-live:before{border-color:var(--warn)}.competition-card{display:grid;grid-template-columns:168px minmax(0,1fr);overflow:hidden}.competition-date{display:flex;flex-direction:column;justify-content:center;gap:2px;padding:26px 22px;border-right:1px solid var(--border);background:var(--surface-2)}.competition-date-label{color:var(--faint);font-size:11.5px;font-weight:600;letter-spacing:.06em}.competition-date strong{font-size:24px;font-weight:800;letter-spacing:-.02em}.competition-date-year{color:var(--faint);font:500 12px/1 var(--font-mono)}.countdown{display:inline-flex;align-self:flex-start;margin-top:12px;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:600;font-variant-numeric:tabular-nums}.countdown-open{background:var(--success-soft);color:var(--success)}.countdown-live{background:var(--warn-soft);color:var(--warn)}.countdown-closed{background:var(--surface-3);color:var(--faint)}.countdown-neutral{background:var(--surface-3);color:var(--muted)}.competition-body{padding:24px 26px}.competition-head{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.organizer{color:var(--faint);font-size:12.5px}.competition-body h2{margin:14px 0 10px;font-size:20px;line-height:1.5}.competition-body>p{color:var(--ink-2);font-size:14.5px;line-height:1.85}.fact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 20px;margin:20px 0 0;padding:16px 18px;border-radius:var(--r-md);background:var(--surface-2)}.fact-grid .fact-wide{grid-column:1 / -1}.fact-grid dt{display:flex;align-items:center;gap:6px;color:var(--faint);font-size:12px;font-weight:600}.fact-grid dd{margin:4px 0 0;color:var(--ink-2);font-size:13.5px;line-height:1.7}.search-field{position:relative;display:flex;align-items:center;gap:10px;margin-bottom:22px;padding:0 16px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface);box-shadow:var(--shadow-sm);color:var(--faint);transition:border-color .18s ease,box-shadow .18s ease}.search-field:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.search-field input{flex:1;min-width:0;padding:15px 0;border:0;background:none;color:var(--ink);font:inherit;outline:none}.search-field input::placeholder{color:var(--faint)}.search-clear{display:grid;place-items:center;width:26px;height:26px;border:0;border-radius:50%;background:var(--surface-3);color:var(--muted);cursor:pointer}.search-clear:hover{background:var(--border-strong);color:var(--ink)}.term-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(272px,1fr));gap:14px}.term-card{display:flex;flex-direction:column;padding:22px}.term-card:before{content:"";position:absolute;inset:0 0 auto;height:3px;border-radius:var(--r-lg) var(--r-lg) 0 0;background:hsl(var(--hue, 240) 70% 60%);opacity:0;transition:opacity .24s ease}.term-card:hover:before{opacity:.9}.term-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:hsl(var(--hue, 240) 78% 95%);color:hsl(var(--hue, 240) 55% 38%);font:700 13px/1 var(--font-mono)}:root[data-theme=dark] .term-mark{background:hsl(var(--hue, 240) 42% 17%);color:hsl(var(--hue, 240) 75% 76%)}.term-card h3{margin:16px 0 8px;font-size:17.5px}.term-card p{display:-webkit-box;overflow:hidden;margin-bottom:16px;color:var(--muted);font-size:13.5px;line-height:1.8;-webkit-line-clamp:3;line-clamp:3;-webkit-box-orient:vertical}.term-card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:14px;border-top:1px solid var(--border)}.term-badges{display:flex;flex-direction:column;gap:3px}.term-hero{display:flex;gap:20px;padding-bottom:30px;border-bottom:1px solid var(--border)}.term-hero-mark{display:grid;flex:none;place-items:center;width:60px;height:60px;border-radius:18px;background:hsl(var(--hue, 240) 78% 95%);color:hsl(var(--hue, 240) 55% 38%);font:800 20px/1 var(--font-mono)}:root[data-theme=dark] .term-hero-mark{background:hsl(var(--hue, 240) 42% 17%);color:hsl(var(--hue, 240) 75% 76%)}.term-hero h1{font-size:clamp(28px,4vw,40px);font-weight:800;line-height:1.25}.term-hero-lead{max-width:720px;margin-top:12px;color:var(--ink-2);font-size:16px;line-height:1.9}.term-hero-meta{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:18px}.term-hero-meta span{display:inline-flex;align-items:center;gap:6px;color:var(--faint);font-size:12.5px}.learning-style-switcher{display:grid;grid-template-columns:180px minmax(0,1fr);gap:20px;align-items:center;margin-top:24px;padding:16px;border:1px solid var(--border);border-radius:var(--r-lg);background:color-mix(in srgb,var(--surface-2) 78%,var(--accent-soft) 22%);box-shadow:var(--shadow-sm)}.learning-style-heading{padding-left:4px}.learning-style-kicker{color:var(--ink);font-size:14px;font-weight:800}.learning-style-heading p{margin-top:5px;color:var(--faint);font-size:12px;line-height:1.65}.learning-style-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.learning-style-tab{position:relative;display:grid;grid-template-columns:38px minmax(0,1fr) auto;gap:11px;align-items:center;min-height:82px;padding:12px 14px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface);color:var(--ink);text-align:left;cursor:pointer;transition:border-color .18s ease,background .18s ease,transform .18s ease}.learning-style-tab:not(:disabled):hover{border-color:var(--accent-line);transform:translateY(-1px)}.learning-style-tab.is-active{border-color:var(--accent);background:color-mix(in srgb,var(--accent-soft) 50%,var(--surface) 50%);box-shadow:inset 0 0 0 1px var(--accent-line)}.learning-style-tab-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--surface-3);color:var(--muted)}.learning-style-tab.is-active .learning-style-tab-mark{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}.learning-style-tab-copy{display:flex;min-width:0;flex-direction:column;gap:3px}.learning-style-tab-copy small{color:var(--faint);font:700 10px/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase}.learning-style-tab-copy strong{font-size:14px}.learning-style-tab-copy>span{overflow:hidden;color:var(--muted);font-size:11.5px;line-height:1.45;text-overflow:ellipsis;white-space:nowrap}.learning-style-active{align-self:start;padding:4px 7px;border-radius:999px;background:var(--accent);color:#fff;font-size:10px;font-weight:700;white-space:nowrap}.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 200px;gap:56px;align-items:start}.detail-main{min-width:0}.detail-section{padding-top:48px}.detail-section-head{margin-bottom:18px}.detail-section-head h2{display:flex;align-items:center;gap:10px;font-size:21px}.detail-section-icon{display:grid;place-items:center;width:30px;height:30px;border:1px solid var(--accent-line);border-radius:10px;background:var(--accent-soft);color:var(--accent-ink)}.detail-section-head p{margin-top:10px;color:var(--muted);font-size:14px;line-height:1.8}.prose p{max-width:40em;color:var(--ink-2);font-size:16px;line-height:1.95}.prose p+p{margin-top:1.35em}.prose-compact p,.prose-list-item p{max-width:none;font:inherit;line-height:inherit}.prose-list-item,.prose-list-item p{display:inline}.prose-lead p{font-size:16.5px}.prose ul,.prose ol{max-width:40em;margin:1.1em 0;padding-left:1.55em;color:var(--ink-2)}.prose li{margin:.55em 0;padding-left:.25em;font-size:15.5px;line-height:1.85}.prose h5{display:inline-flex;align-items:center;margin:1.25em 0 .55em;padding:5px 10px;border-radius:999px;background:var(--surface-3);color:var(--accent-ink);font-size:12.5px;letter-spacing:.02em}.prose h5:first-child{margin-top:0}.prose code{padding:.12em .38em;border:1px solid var(--border);border-radius:5px;background:var(--surface-3);color:var(--ink);font:.9em/1.6 var(--font-mono)}.prose pre{max-width:100%;overflow-x:auto;margin:1.1em 0;padding:14px 16px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-3)}.prose pre code{padding:0;border:0;background:transparent}.prose .katex{color:var(--ink);font-size:1.04em}.prose .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden;margin:1.25em 0;padding:14px 16px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-2);text-align:left}.prose .katex-display>.katex{text-align:left}.detail-aside{position:sticky;top:92px}.toc{display:flex;flex-direction:column;gap:2px;padding-left:14px;border-left:2px solid var(--border)}.toc-title{margin-bottom:8px;color:var(--faint);font:700 11px/1 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.toc-link{padding:6px 0;color:var(--muted);font-size:13.5px;transition:color .18s ease,transform .18s ease}.toc-link:hover{color:var(--ink);transform:translate(2px)}.toc-active{color:var(--accent-ink);font-weight:600}.path-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px;padding:10px 14px;border:1px dashed var(--border-strong);border-radius:var(--r-md)}.path-hint{display:inline-flex;align-items:center;gap:7px;color:var(--muted);font-size:13px}.path{display:grid;gap:14px;margin:0;padding:0 0 0 34px;list-style:none}.path-step{position:relative}.path-node{position:absolute;left:-34px;top:22px;display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--surface-3);color:var(--muted);font:700 12px/1 var(--font-mono);transition:background .24s ease,color .24s ease}.path-step.is-open .path-node{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}.path-step:not(:last-child):before{content:"";position:absolute;left:-22px;top:52px;bottom:-14px;width:2px;background:var(--border)}.path-card{padding:20px 22px}.path-kicker{color:var(--faint);font:700 11px/1 var(--font-mono);letter-spacing:.1em}.path-card h3{margin:9px 0 8px;font-size:17px}.path-intuition{margin-top:12px;padding:14px 16px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-2)}.path-intuition-label{display:inline-flex;align-items:center;gap:6px;margin-bottom:7px;color:var(--accent-ink);font-size:12.5px;font-weight:700}.path-intuition p{max-width:44em;color:var(--ink-2);font-size:14.5px;line-height:1.85}.path-toggle{display:inline-flex;align-items:center;gap:7px;margin-top:16px;padding:8px 14px;border:1px solid var(--border);border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:13px;font-weight:600;cursor:pointer;transition:all .18s ease}.path-toggle:hover{border-color:var(--accent);color:var(--accent-ink)}.path-toggle-chev{transition:transform .24s var(--ease)}.is-open .path-toggle-chev{transform:rotate(180deg)}.path-toggle-size{color:var(--faint);font-weight:500}.path-panel{margin-top:22px;padding-top:22px;border-top:1px solid var(--border);animation:reveal .3s var(--ease) both}.path-block+.path-block,.path-panel .callout{margin-top:30px}.path-block h4{margin-bottom:14px;color:var(--ink);font-size:15px}.lesson-flow{display:grid;gap:26px}.lesson-orientation{padding:18px 20px 20px;border:1px solid var(--accent-line);border-left:4px solid var(--accent);border-radius:var(--r-md);background:color-mix(in srgb,var(--accent-soft) 36%,var(--surface) 64%)}.lesson-stage-label{display:inline-flex;align-items:center;gap:6px;margin-bottom:11px;color:var(--accent-ink);font-size:12.5px;font-weight:750;letter-spacing:.01em}.lesson-orientation .prose p{max-width:44em;font-size:15.5px;line-height:1.95}.lesson-detail{min-width:0;padding-top:2px}.lesson-detail-label{width:100%;margin-bottom:16px;padding-bottom:10px;border-bottom:1px dashed var(--border);color:var(--muted)}.path-example-block{padding:18px 20px 20px;border:1px solid var(--accent-line);border-radius:var(--r-lg);background:color-mix(in srgb,var(--accent-soft) 48%,var(--surface) 52%)}.path-example-block>h4{color:var(--accent-ink)}.path-link{display:inline-flex;align-items:center;gap:6px;margin-top:18px;color:var(--accent-ink);font-size:13.5px;font-weight:600}.path-link:hover{text-decoration:underline}.callout{padding:14px 16px;border:1px solid;border-radius:var(--r-md)}.callout h4{display:flex;align-items:center;gap:6px;margin-bottom:8px;font-size:13px;letter-spacing:.01em}.callout p{font-size:14px;line-height:1.85}.callout ul{margin:0;padding-left:20px}.callout li{margin:5px 0;font-size:14px;line-height:1.8}.callout-why{margin-top:14px;border-color:var(--accent-line);background:var(--accent-soft)}.callout-why h4{color:var(--accent-ink)}.callout-why p{color:var(--ink-2)}.callout-warn{border-color:var(--warn-line);background:var(--warn-soft)}.callout-warn h4{color:var(--warn)}.callout-warn li{color:var(--ink-2)}.callout-check{border-color:var(--success-line);background:var(--success-soft)}.callout-check h4{color:var(--success)}.callout-check li{color:var(--ink-2)}.tutor-journey{display:grid;gap:14px}.tutor-status-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:12px 15px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-2)}.tutor-status-bar>div{display:flex;align-items:center;gap:8px;min-width:0}.tutor-status-bar strong{overflow:hidden;color:var(--ink-2);font-size:12px;text-overflow:ellipsis;white-space:nowrap}.tutor-status-bar p{color:var(--faint);font-size:11.5px;line-height:1.55;text-align:right}.tutor-live-dot{flex:none;width:8px;height:8px;border-radius:50%;background:var(--warn);box-shadow:0 0 0 4px var(--warn-soft)}.tutor-live-dot.is-live{background:var(--success);box-shadow:0 0 0 4px var(--success-soft)}.tutor-section-strip{display:flex;gap:9px;overflow-x:auto;padding:2px 1px 7px;scrollbar-width:thin}.tutor-section-tab{display:grid;grid-template-columns:28px minmax(0,1fr);gap:9px;flex:0 0 220px;align-items:center;padding:11px 12px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface);color:var(--muted);text-align:left;cursor:pointer;transition:border-color .18s ease,background .18s ease,transform .18s ease}.tutor-section-tab:not(:disabled):hover{border-color:var(--accent);transform:translateY(-1px)}.tutor-section-tab>span{display:grid;place-items:center;width:28px;height:28px;border-radius:9px;background:var(--surface-3);font:750 11px/1 var(--font-mono)}.tutor-section-tab>div{min-width:0}.tutor-section-tab small,.tutor-section-tab strong{display:block}.tutor-section-tab small{margin-bottom:3px;color:var(--faint);font:700 9.5px/1 var(--font-mono);letter-spacing:.06em}.tutor-section-tab strong{overflow:hidden;color:var(--ink-2);font-size:12px;text-overflow:ellipsis;white-space:nowrap}.tutor-section-tab.is-current{border-color:var(--accent);background:var(--accent-soft)}.tutor-section-tab.is-current>span{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}.tutor-section-tab.is-done>span{background:var(--success-soft);color:var(--success)}.tutor-section-tab:disabled{opacity:.4;cursor:not-allowed}.tutor-progress-line{height:4px;overflow:hidden;border-radius:999px;background:var(--surface-3)}.tutor-progress-line span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .3s var(--ease)}.tutor-workspace{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(320px,.88fr);gap:16px;align-items:start}.tutor-reading-card,.tutor-chat-card{min-width:0;overflow:hidden;border:1px solid var(--border-strong);border-radius:calc(var(--r-lg) + 2px);background:var(--surface);box-shadow:var(--shadow-sm)}.tutor-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:18px 20px;border-bottom:1px solid var(--border);background:var(--surface-2)}.tutor-card-head>div>span{color:var(--accent-ink);font:750 10px/1 var(--font-mono);letter-spacing:.08em}.tutor-card-head h3{margin-top:8px;font-size:17px;line-height:1.45}.tutor-scope-badge{flex:none;padding:5px 8px;border:1px solid var(--accent-line);border-radius:999px;background:var(--accent-soft);color:var(--accent-ink);font-size:10px;font-weight:700}.tutor-reading-body{padding:20px}.tutor-reading-intro{padding:15px 16px;border-left:4px solid var(--accent);border-radius:0 var(--r-md) var(--r-md) 0;background:var(--accent-soft)}.tutor-reading-intro>span,.tutor-reading-label{display:block;margin-bottom:7px;color:var(--accent-ink);font-size:11.5px;font-weight:750}.tutor-reading-intro .prose p,.tutor-reading-why .prose p{color:var(--ink-2);font-size:14px;line-height:1.85}.tutor-reading-why{margin-top:14px;padding:14px 16px;border:1px dashed var(--border-strong);border-radius:var(--r-md);background:var(--surface-2)}.tutor-reading-why>span{display:flex;align-items:center;gap:6px;margin-bottom:7px;color:var(--muted);font-size:11.5px;font-weight:700}.tutor-base-text{margin-top:22px;padding-top:18px;border-top:1px solid var(--border)}.tutor-base-text .lesson-flow{gap:20px}.tutor-base-text .lesson-orientation,.tutor-base-text .path-example-block{padding:15px 16px}.tutor-base-text .prose p{font-size:14.5px;line-height:1.9}.tutor-reference-details{margin-top:20px;padding:0 15px 14px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-2)}.tutor-reference-details summary{padding:13px 0;color:var(--accent-ink);font-size:12px;font-weight:700;cursor:pointer}.tutor-reference-details .prose p,.tutor-reference-details li{font-size:13.5px;line-height:1.8}.tutor-reference-details ul{margin:14px 0 0;padding-left:20px}.tutor-reading-foot{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 20px;border-top:1px solid var(--border);background:var(--surface-2)}.tutor-reading-foot p{color:var(--faint);font-size:11.5px;line-height:1.6}.tutor-reading-foot .btn{flex:none}.tutor-chat-card{position:sticky;top:88px}.tutor-chat-head{display:flex;align-items:center;gap:11px;padding:15px 16px;border-bottom:1px solid var(--border);background:linear-gradient(135deg,var(--accent-soft),var(--surface-2))}.tutor-avatar{display:grid;flex:none;place-items:center;width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}.tutor-chat-head strong,.tutor-chat-head small{display:block}.tutor-chat-head strong{color:var(--ink);font-size:13.5px}.tutor-chat-head small{margin-top:3px;color:var(--faint);font-size:10.5px;line-height:1.45}.tutor-chat-log{display:flex;max-height:500px;min-height:260px;overflow-y:auto;flex-direction:column;gap:12px;padding:16px;background:color-mix(in srgb,var(--surface-2) 64%,var(--surface) 36%)}.tutor-message{display:flex;max-width:92%;flex-direction:column;gap:5px;align-self:flex-start}.tutor-message>span{padding-left:3px;color:var(--faint);font-size:10px;font-weight:700}.tutor-message>div{padding:10px 12px;border:1px solid var(--border);border-radius:5px 14px 14px;background:var(--surface);color:var(--ink-2)}.tutor-message .prose p{max-width:none;color:inherit;font-size:13px;line-height:1.75}.tutor-message .prose p+p{margin-top:.95em}.tutor-message .prose ul,.tutor-message .prose ol{max-width:none;margin:.85em 0;padding-left:1.35em}.tutor-message .prose li{margin:.4em 0;padding-left:.15em;font-size:13px;line-height:1.72}.tutor-message .prose .katex-display{margin:.9em 0;padding:11px 12px;border-radius:9px;background:var(--surface-2)}.tutor-message.is-user{align-self:flex-end;align-items:flex-end}.tutor-message.is-user>div{border-color:var(--accent-line);border-radius:14px 5px 14px 14px;background:var(--accent-soft);color:var(--accent-ink)}.tutor-message.is-thinking>div{color:var(--faint);font-size:12px}.tutor-mode-note,.tutor-chat-error{margin:10px 14px 0;padding:8px 10px;border-radius:9px;font-size:11.5px;line-height:1.55}.tutor-mode-note{background:var(--warn-soft);color:var(--warn)}.tutor-chat-error{background:var(--danger-soft, var(--warn-soft));color:var(--danger, var(--warn))}.tutor-suggestions{display:flex;gap:7px;overflow-x:auto;padding:12px 14px 4px;scrollbar-width:thin}.tutor-suggestions button{flex:0 0 auto;max-width:240px;overflow:hidden;padding:7px 10px;border:1px solid var(--border);border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:10.5px;text-overflow:ellipsis;white-space:nowrap;cursor:pointer}.tutor-suggestions button:not(:disabled):hover{border-color:var(--accent);color:var(--accent-ink)}.tutor-composer{padding:11px 14px 14px}.tutor-composer>label{display:block;margin-bottom:7px;color:var(--ink-2);font-size:11.5px;font-weight:700}.tutor-composer textarea{width:100%;min-height:78px;resize:vertical;padding:10px 11px;border:1px solid var(--border-strong);border-radius:10px;outline:none;background:var(--surface-2);color:var(--ink);font:13px/1.65 var(--font-sans)}.tutor-composer textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.tutor-composer>div{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:8px}.tutor-composer small{color:var(--faint);font-size:9.5px}.socratic-journey{display:grid;gap:18px}.socratic-level-gate{padding:24px;border:1px solid var(--accent-line);border-radius:calc(var(--r-lg) + 2px);background:color-mix(in srgb,var(--accent-soft) 34%,var(--surface) 66%);box-shadow:var(--shadow-sm)}.socratic-level-kicker{color:var(--accent-ink);font:750 10.5px/1 var(--font-mono);letter-spacing:.09em}.socratic-level-gate h3{margin-top:10px;font-size:19px}.socratic-level-gate>p{margin-top:8px;color:var(--muted);font-size:13.5px;line-height:1.75}.socratic-level-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:18px}.socratic-level-options button{display:grid;grid-template-columns:28px minmax(0,1fr);gap:4px 9px;padding:15px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface);color:var(--ink);text-align:left;cursor:pointer;transition:border-color .18s ease,transform .18s ease,box-shadow .18s ease}.socratic-level-options button:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.socratic-level-options button>span{display:grid;grid-row:1 / 3;place-items:center;width:28px;height:28px;border-radius:9px;background:var(--accent-soft);color:var(--accent-ink);font:750 10px/1 var(--font-mono)}.socratic-level-options strong{font-size:13px}.socratic-level-options small{color:var(--faint);font-size:11px;line-height:1.55}.socratic-progress-card{padding:16px 18px;border:1px solid var(--accent-line);border-radius:var(--r-lg);background:color-mix(in srgb,var(--accent-soft) 40%,var(--surface) 60%)}.socratic-progress-copy{display:flex;align-items:center;justify-content:space-between;gap:12px}.socratic-progress-copy span{color:var(--muted);font-size:12.5px;font-weight:650}.socratic-progress-copy strong{margin-left:auto;color:var(--accent-ink);font:750 12px/1 var(--font-mono)}.socratic-progress-copy button{padding:3px 0 3px 8px;border:0;background:transparent;color:var(--faint);font-size:11px;cursor:pointer}.socratic-progress-copy button:hover{color:var(--accent-ink);text-decoration:underline}.socratic-progress-track{height:7px;overflow:hidden;margin-top:11px;border-radius:999px;background:var(--surface-3)}.socratic-progress-track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .35s var(--ease)}.socratic-progress-card>p{margin-top:9px;color:var(--faint);font-size:12px;line-height:1.65}.socratic-chapter-strip{display:flex;gap:9px;overflow-x:auto;padding:2px 1px 8px;scrollbar-width:thin}.socratic-chapter{display:grid;grid-template-columns:26px minmax(130px,1fr);grid-template-rows:auto auto;column-gap:9px;flex:0 0 210px;align-items:center;padding:10px 12px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface);color:var(--muted);text-align:left;cursor:pointer}.socratic-chapter>span{display:grid;grid-row:1 / 3;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--surface-3);font:700 11px/1 var(--font-mono)}.socratic-chapter strong{overflow:hidden;color:var(--ink-2);font-size:12.5px;text-overflow:ellipsis;white-space:nowrap}.socratic-chapter small{margin-top:3px;color:var(--faint);font-size:10.5px}.socratic-chapter.is-current{border-color:var(--accent);background:var(--accent-soft)}.socratic-chapter.is-current>span{background:var(--accent);color:#fff}.socratic-chapter.is-done>span{background:var(--success-soft);color:var(--success)}.socratic-chapter:disabled{opacity:.46;cursor:not-allowed}.socratic-question-map{display:flex;align-items:center;gap:7px;padding:0 2px}.socratic-question-dot{display:grid;place-items:center;width:28px;height:28px;border:1px solid var(--border);border-radius:50%;background:var(--surface-2);color:var(--faint);font:700 11px/1 var(--font-mono);cursor:pointer;transition:transform .16s ease,border-color .16s ease}.socratic-question-dot:not(:disabled):hover{border-color:var(--accent);transform:translateY(-1px)}.socratic-question-dot.is-current{border-color:var(--accent);background:var(--accent);color:#fff;box-shadow:0 0 0 4px var(--accent-soft)}.socratic-question-dot.is-done:not(.is-current){border-color:var(--success-line);background:var(--success-soft);color:var(--success)}.socratic-question-dot:disabled{opacity:.38;cursor:not-allowed}.socratic-card{overflow:hidden;border:1px solid var(--border-strong);border-radius:calc(var(--r-lg) + 2px);background:var(--surface);box-shadow:var(--shadow-md)}.socratic-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding:20px 22px;border-bottom:1px solid var(--border);background:var(--surface-2)}.socratic-node-kicker{color:var(--accent-ink);font:750 10.5px/1 var(--font-mono);letter-spacing:.08em;text-transform:uppercase}.socratic-card-head h3{margin-top:8px;font-size:18px;line-height:1.5}.socratic-one-question{flex:none;padding:6px 9px;border:1px solid var(--accent-line);border-radius:999px;background:var(--accent-soft);color:var(--accent-ink);font-size:10.5px;font-weight:700}.socratic-setup{padding:22px 22px 20px}.socratic-block-label{display:inline-flex;align-items:center;gap:6px;margin-bottom:10px;color:var(--muted);font-size:12px;font-weight:750}.socratic-setup .prose p,.socratic-derivation>.prose p{max-width:46em;font-size:15px;line-height:1.95}.socratic-question{display:grid;grid-template-columns:42px minmax(0,1fr);gap:14px;margin:0 22px;padding:18px 20px;border:1px solid var(--accent-line);border-left:4px solid var(--accent);border-radius:var(--r-lg);background:color-mix(in srgb,var(--accent-soft) 46%,var(--surface) 54%)}.socratic-question-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font:800 21px/1 var(--font-mono)}.socratic-question>div>span{display:block;margin-bottom:6px;color:var(--accent-ink);font-size:11.5px;font-weight:750}.socratic-question .prose p{max-width:42em;color:var(--ink);font-size:17px;font-weight:650;line-height:1.75}.socratic-answer-box{display:grid;gap:9px;margin:16px 22px 0;padding:14px 16px 16px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-2)}.socratic-answer-box>span{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.socratic-answer-box strong{color:var(--ink-2);font-size:12.5px}.socratic-answer-box small{color:var(--faint);font-size:10.5px}.socratic-answer-box textarea{width:100%;min-height:92px;resize:vertical;padding:11px 12px;border:1px solid var(--border-strong);border-radius:10px;outline:none;background:var(--surface);color:var(--ink);font:14px/1.75 var(--font-sans);transition:border-color .18s ease,box-shadow .18s ease}.socratic-answer-box textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.socratic-answer-box textarea::placeholder{color:var(--faint)}.socratic-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:9px;padding:16px 22px 22px}.socratic-hints{display:grid;gap:9px;padding:0 22px 22px;animation:reveal .25s var(--ease) both}.socratic-hint{display:grid;grid-template-columns:66px minmax(0,1fr);gap:12px;padding:13px 15px;border:1px dashed var(--border-strong);border-radius:var(--r-md);background:var(--surface-2)}.socratic-hint>span{color:var(--accent-ink);font:750 11px/1.7 var(--font-mono)}.socratic-hint .prose p{color:var(--ink-2);font-size:13.5px;line-height:1.8}.socratic-derivation{padding:22px;border-top:1px solid var(--border);background:color-mix(in srgb,var(--surface-2) 74%,var(--surface) 26%);animation:reveal .3s var(--ease) both}.socratic-derivation-head{margin-bottom:16px;padding-bottom:12px;border-bottom:1px dashed var(--border)}.socratic-derivation-head .socratic-block-label{margin-bottom:5px;color:var(--accent-ink)}.socratic-derivation-head p{color:var(--faint);font-size:12.5px}.socratic-self-check{margin-top:22px;padding:16px 18px;border:1px solid var(--success-line);border-radius:var(--r-md);background:var(--success-soft)}.socratic-self-check>strong{display:flex;align-items:center;gap:7px;color:var(--success);font-size:13px}.socratic-self-check ul{margin:10px 0 0;padding-left:20px}.socratic-self-check li{margin-top:6px;color:var(--ink-2);font-size:13.5px;line-height:1.75}.socratic-bridge{margin-top:14px;padding:14px 16px;border-left:3px solid var(--accent-2);border-radius:0 var(--r-md) var(--r-md) 0;background:var(--surface)}.socratic-bridge>span{display:block;margin-bottom:6px;color:var(--accent-ink);font-size:11.5px;font-weight:750}.socratic-bridge .prose p{color:var(--ink-2);font-size:13.5px;line-height:1.8}.socratic-complete-actions{display:flex;justify-content:space-between;gap:12px;margin-top:20px}.related-row{display:flex;flex-wrap:wrap;gap:8px}.related-chip{display:inline-flex;align-items:center;gap:5px;padding:7px 13px;border:1px solid var(--border);border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:13px}.related-chip-link{border-color:var(--accent-line);background:var(--accent-soft);color:var(--accent-ink);font-weight:600;transition:transform .18s var(--ease),box-shadow .18s ease}.related-chip-link:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}.related-chip-link svg{transition:transform .18s var(--ease)}.related-chip-link:hover svg{transform:translate(2px)}.source-list{display:grid;gap:10px}.source-card{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface);color:var(--faint);transition:border-color .18s ease,transform .18s var(--ease),box-shadow .18s ease}.source-card:hover{transform:translateY(-2px);border-color:var(--accent-line);box-shadow:var(--shadow-sm)}.source-favicon{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--surface-3);color:var(--muted);font:700 14px/1 var(--font-mono)}.source-text{min-width:0}.source-text strong{display:block;overflow:hidden;color:var(--ink);font-size:14.5px;font-weight:600;text-overflow:ellipsis;white-space:nowrap}.source-text small{display:block;margin-top:3px;overflow:hidden;color:var(--faint);font-size:12.5px;text-overflow:ellipsis;white-space:nowrap}.verify-note{display:flex;align-items:center;gap:9px;margin-top:22px;padding:14px 16px;border-radius:var(--r-md);background:var(--surface-2);color:var(--muted);font-size:13px}.detail-skeleton{display:grid;gap:14px;max-width:720px}.admin-login{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:14px;max-width:640px;padding:20px 22px}.admin-login-field{display:grid;gap:7px}.admin-login-field span{color:var(--muted);font-size:12.5px;font-weight:600}.admin-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}.admin-stat{padding:20px 22px}.admin-stat strong{display:block;font-size:28px;font-weight:800;font-variant-numeric:tabular-nums}.admin-stat span{color:var(--muted);font-size:13px}.tab-row{display:flex;flex-wrap:wrap;gap:8px;margin:30px 0 16px}.tab{padding:9px 16px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--surface);color:var(--muted);font-size:14px;cursor:pointer;transition:all .16s ease}.tab:hover{border-color:var(--border-strong);color:var(--ink)}.tab-active{border-color:transparent;background:var(--ink);color:var(--bg);font-weight:600}.admin-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:860px;padding:26px}.field{display:grid;gap:7px;align-content:start}.field-wide{grid-column:1 / -1}.field>span{color:var(--muted);font-size:12.5px;font-weight:600}.admin-login input,.admin-form input,.admin-form textarea{width:100%;padding:11px 13px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--surface-2);color:var(--ink);font:inherit;outline:none;resize:vertical;transition:border-color .18s ease,box-shadow .18s ease,background-color .18s ease}.admin-login input:focus,.admin-form input:focus,.admin-form textarea:focus{border-color:var(--accent);background:var(--surface);box-shadow:0 0 0 4px var(--accent-soft)}.admin-form-actions{grid-column:1 / -1}.notice{display:flex;align-items:flex-start;gap:11px;margin:16px 0;padding:15px 17px;border:1px solid;border-radius:var(--r-md)}.notice strong{display:block;font-size:14px}.notice span{display:block;margin-top:3px;font-size:13.5px;line-height:1.7}.notice-error{border-color:var(--danger-line);background:var(--danger-soft);color:var(--danger)}.notice-success{border-color:var(--success-line);background:var(--success-soft);color:var(--success)}.empty-state{display:grid;justify-items:center;gap:10px;padding:56px 24px;border:1px dashed var(--border-strong);border-radius:var(--r-lg);text-align:center}.empty-icon{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:var(--surface-3);color:var(--faint)}.empty-state strong{font-size:16px}.empty-state p{max-width:380px;color:var(--muted);font-size:14px;line-height:1.75}.empty-state .btn{margin-top:6px}.skel{display:block;background:linear-gradient(90deg,var(--surface-3) 25%,var(--surface-2) 37%,var(--surface-3) 63%);background-size:400% 100%;animation:shimmer 1.5s ease-in-out infinite}@keyframes shimmer{0%{background-position:100% 50%}to{background-position:0 50%}}.skeleton-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(272px,1fr));gap:14px}.skeleton-card{display:grid;gap:10px;padding:22px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface)}.not-found{display:grid;justify-items:center;gap:8px;padding:80px 20px 100px;text-align:center}.not-found-code{background:linear-gradient(120deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent;font:800 84px/1 var(--font-mono);letter-spacing:-.04em}.not-found h1{margin-top:10px;font-size:26px}.not-found p{color:var(--muted);font-size:15px}.to-top{position:fixed;right:26px;bottom:26px;z-index:40;display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--border);border-radius:50%;background:var(--surface);box-shadow:var(--shadow-md);color:var(--muted);cursor:pointer;animation:reveal .25s var(--ease) both;transition:color .18s ease,transform .18s var(--ease)}.to-top:hover{transform:translateY(-2px);color:var(--accent-ink)}.ring{position:relative;display:inline-grid;flex:none;place-items:center}.ring svg{position:absolute;top:0;right:0;bottom:0;left:0}.ring-track{stroke:var(--surface-3)}.ring-value{stroke:var(--accent);transition:stroke-dashoffset .5s var(--ease)}.ring-complete .ring-value{stroke:var(--success)}.ring-text{font:700 12px/1 var(--font-mono);color:var(--muted)}.ring-complete .ring-text{color:var(--success)}.term-hero-title{display:flex;flex-wrap:wrap;align-items:center;gap:16px}.term-progress{display:inline-flex;align-items:center;gap:10px;padding:6px 14px 6px 8px;border:1px solid var(--border);border-radius:999px;background:var(--surface)}.term-progress strong{display:block;font-size:14px;font-variant-numeric:tabular-nums}.term-progress small{display:block;color:var(--faint);font-size:11.5px}.term-progress.is-done{border-color:var(--success-line);background:var(--success-soft)}.term-progress.is-done strong{color:var(--success)}.term-card-top{display:flex;align-items:center;justify-content:space-between}.path-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-top:18px}.path-foot .path-link{margin-top:0}.mark-btn{display:inline-flex;align-items:center;gap:6px;margin-left:auto;padding:8px 14px;border:1px solid var(--border-strong);border-radius:999px;background:var(--surface);color:var(--muted);font-size:13px;font-weight:600;cursor:pointer;transition:all .18s ease}.mark-btn:hover{border-color:var(--success);color:var(--success);transform:translateY(-1px)}.mark-btn.is-done{border-color:transparent;background:var(--success-soft);color:var(--success)}.path-done-tag{margin-left:10px;padding:2px 8px;border-radius:999px;background:var(--success-soft);color:var(--success);font:600 10.5px/1.6 var(--font-sans);letter-spacing:0}.path-step.is-done .path-node{background:var(--success);color:#fff}.path-step.is-done .path-card{border-color:var(--success-line)}.path-finished{display:flex;align-items:center;gap:14px;margin-top:18px;padding:18px 20px;border:1px solid var(--success-line);border-radius:var(--r-lg);background:var(--success-soft)}.path-finished-mark{display:grid;flex:none;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--surface);color:var(--success)}.path-finished strong{font-size:15px}.path-finished p{margin-top:4px;color:var(--ink-2);font-size:13.5px;line-height:1.7}.path-finished a{margin:0 2px;color:var(--accent-ink);font-weight:600}.progress-panel{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;padding:24px 28px}.progress-main{display:flex;align-items:center;gap:16px}.progress-main strong{display:block;font-size:26px;font-weight:800;font-variant-numeric:tabular-nums;line-height:1.1}.progress-main span{color:var(--muted);font-size:13px}.progress-facts{display:flex;flex-wrap:wrap;gap:32px}.progress-facts strong{display:block;font-size:20px;font-weight:700;font-variant-numeric:tabular-nums}.progress-facts span{color:var(--faint);font-size:12.5px}.cat-corner{position:fixed;left:22px;bottom:18px;z-index:45;display:flex;flex-direction:column;align-items:flex-start;gap:6px;pointer-events:none}.cat-corner>*{pointer-events:auto}.cat-corner:before{content:"";position:absolute;left:-16px;bottom:-14px;width:132px;height:122px;border-radius:50%;background:radial-gradient(closest-side,var(--bg) 58%,transparent 100%);pointer-events:none}.cat-body{position:relative;padding:0;border:0;background:none;cursor:pointer;line-height:0;filter:drop-shadow(0 6px 10px rgba(15,22,38,.16));transition:transform .2s var(--ease)}.cat-body:hover{transform:translateY(-3px) scale(1.04)}:root[data-theme=dark] .cat-body{filter:drop-shadow(0 6px 12px rgba(0,0,0,.5))}.cat-hide{position:absolute;top:8px;left:-4px;display:grid;place-items:center;width:20px;height:20px;border:1px solid var(--border);border-radius:50%;background:var(--surface);color:var(--faint);font-size:13px;line-height:1;cursor:pointer;opacity:0;transition:opacity .2s ease}.cat-corner:hover .cat-hide{opacity:1}.cat-restore{position:fixed;left:22px;bottom:22px;z-index:45;display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--border);border-radius:50%;background:var(--surface);box-shadow:var(--shadow-sm);color:#f6a94a;cursor:pointer;opacity:.85;transition:opacity .2s ease,transform .2s var(--ease),color .2s ease}.cat-restore svg{fill:currentColor}.cat-restore:hover{opacity:1;transform:translateY(-2px) rotate(-8deg);border-color:#f6a94a}.cat-bubble{max-width:250px;padding:11px 15px;border:1px solid var(--border);border-radius:16px 16px 16px 4px;background:var(--surface);box-shadow:var(--shadow-md);animation:cat-pop .32s var(--ease) both}.cat-bubble strong{display:block;color:var(--ink);font-size:13.5px;line-height:1.5}.cat-bubble small{display:block;margin-top:3px;color:var(--muted);font-size:12.5px;line-height:1.6}@keyframes cat-pop{0%{opacity:0;transform:translateY(8px) scale(.92)}to{opacity:1;transform:none}}.cat-fur{fill:#f6a94a;stroke:#c9762a;stroke-width:2.5;stroke-linejoin:round}:root[data-theme=dark] .cat-fur{fill:#e5983d;stroke:#8a4f18}.cat-tail{stroke:#f6a94a;transform-origin:88px 88px;animation:cat-tail 3.4s ease-in-out infinite}:root[data-theme=dark] .cat-tail{stroke:#e5983d}.cat-ear-inner{fill:#ffc9c9}.cat-eyes-open{fill:#2b1d10}.cat-eyes-happy{stroke:#2b1d10;opacity:0}.cat-nose{fill:#e2716f}.cat-mouth{stroke:#7a4a1c}.cat-blush{fill:#ff9d9d;opacity:.5}.cat-whiskers{stroke:#c9762a;opacity:.75}.cat-love{fill:#ef5f7a;opacity:0;transform-origin:60px 12px}.cat-spark{fill:#ffc94d;opacity:0}.cat-z{fill:var(--faint);font:700 13px/1 var(--font-mono);opacity:0}.cat-head{transform-origin:60px 46px}.cat-paw{transform-origin:center bottom}@keyframes cat-tail{0%,to{transform:rotate(0)}50%{transform:rotate(-16deg)}}.cat-ear-l,.cat-ear-r{transform-origin:60px 30px}.cat-idle .cat-ear-r{animation:cat-ear 6.5s ease-in-out infinite}@keyframes cat-ear{0%,88%,to{transform:rotate(0)}92%{transform:rotate(-9deg)}96%{transform:rotate(4deg)}}.cat-idle .cat-eyes-open{animation:cat-blink 5.5s infinite}@keyframes cat-blink{0%,92%,to{transform:scaleY(1)}95%{transform:scaleY(.1)}}.cat-idle .cat-eyes-open{transform-origin:center 39px}.cat-hi .cat-paw-r{animation:cat-wave .7s ease-in-out 3}@keyframes cat-wave{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-16px) rotate(-22deg)}}.cat-heart .cat-eyes-open{opacity:0}.cat-heart .cat-eyes-happy{opacity:1}.cat-heart .cat-paw-l{animation:cat-lift-l .5s var(--ease) both}.cat-heart .cat-paw-r{animation:cat-lift-r .5s var(--ease) both}.cat-heart .cat-love{animation:cat-heart-up 2.4s ease-out both}.cat-heart .cat-head{animation:cat-nod .9s ease-in-out 2}@keyframes cat-lift-l{to{transform:translate(6px,-22px) rotate(-30deg)}}@keyframes cat-lift-r{to{transform:translate(-6px,-22px) rotate(30deg)}}@keyframes cat-heart-up{0%{opacity:0;transform:translateY(8px) scale(.4)}25%{opacity:1;transform:translateY(0) scale(1.1)}60%{opacity:1;transform:translateY(-4px) scale(1)}to{opacity:0;transform:translateY(-18px) scale(.9)}}@keyframes cat-nod{0%,to{transform:rotate(0)}50%{transform:rotate(6deg)}}.cat-cheer .cat-eyes-open{opacity:0}.cat-cheer .cat-eyes-happy{opacity:1}.cat-cheer .cat-paw-l{animation:cat-lift-l .4s var(--ease) both}.cat-cheer .cat-paw-r{animation:cat-lift-r .4s var(--ease) both}.cat-cheer .cat-body svg,.cat-cheer svg{animation:cat-jump .62s ease-in-out 4}.cat-cheer .cat-spark-1{animation:cat-spark 1.5s ease-out 3}.cat-cheer .cat-spark-2{animation:cat-spark 1.5s ease-out .25s 3}.cat-cheer .cat-spark-3{animation:cat-spark 1.5s ease-out .5s 3}@keyframes cat-jump{0%,to{transform:translateY(0)}40%{transform:translateY(-14px)}60%{transform:translateY(-8px)}}@keyframes cat-spark{0%{opacity:0;transform:scale(.4) rotate(0)}40%{opacity:1;transform:scale(1.15) rotate(60deg)}to{opacity:0;transform:scale(.7) rotate(140deg)}}.cat-proud .cat-head{animation:cat-proud 1.1s ease-in-out 2}.cat-proud .cat-spark-1{animation:cat-spark 1.6s ease-out 2}.cat-proud .cat-spark-2{animation:cat-spark 1.6s ease-out .3s 2}@keyframes cat-proud{0%,to{transform:translateY(0)}50%{transform:translateY(-5px) scale(1.05)}}.cat-think .cat-head{animation:cat-tilt 1.6s ease-in-out infinite}@keyframes cat-tilt{0%,to{transform:rotate(0)}50%{transform:rotate(-11deg)}}.cat-sleep .cat-eyes-open{opacity:0}.cat-sleep .cat-eyes-happy{opacity:1}.cat-sleep .cat-tail{animation-duration:6s}.cat-sleep .cat-z-1{animation:cat-z 3s ease-out infinite}.cat-sleep .cat-z-2{animation:cat-z 3s ease-out .9s infinite}.cat-sleep .cat-head{animation:cat-breathe 3.4s ease-in-out infinite}@keyframes cat-z{0%{opacity:0;transform:translateY(4px) scale(.7)}30%{opacity:.9}to{opacity:0;transform:translateY(-14px) scale(1.1)}}@keyframes cat-breathe{0%,to{transform:translateY(0)}50%{transform:translateY(2px)}}.site-footer{margin-top:40px;border-top:1px solid var(--border);background:var(--surface)}.footer-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;max-width:var(--page);margin:0 auto;padding:32px var(--gutter) 40px}.footer-brand{display:flex;align-items:center;gap:12px}.footer-brand strong{font-size:14px}.footer-brand p{margin-top:3px;color:var(--faint);font-size:12.5px}.footer-links{display:flex;flex-wrap:wrap;gap:20px}.footer-links a{color:var(--muted);font-size:13px;transition:color .18s ease}.footer-links a:hover{color:var(--accent-ink)}.footer-note{width:100%;padding-top:20px;border-top:1px solid var(--border);color:var(--faint);font-size:12px}@keyframes reveal{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.feature-grid>*,.term-grid>*,.stack>*,.timeline>*,.hero-stats>*,.deadline-grid>*,.news-preview>*{animation:reveal .42s var(--ease) both}.feature-grid>:nth-child(2),.term-grid>:nth-child(2),.stack>:nth-child(2),.timeline>:nth-child(2),.hero-stats>:nth-child(2),.deadline-grid>:nth-child(2),.news-preview>:nth-child(2){animation-delay:.05s}.feature-grid>:nth-child(3),.term-grid>:nth-child(3),.stack>:nth-child(3),.timeline>:nth-child(3),.hero-stats>:nth-child(3),.deadline-grid>:nth-child(3),.news-preview>:nth-child(3){animation-delay:.1s}.term-grid>:nth-child(n+4),.stack>:nth-child(n+4),.news-preview>:nth-child(n+4){animation-delay:.15s}@media(max-width:1080px){.detail-layout{grid-template-columns:minmax(0,1fr);gap:0}.detail-aside{display:none}}@media(max-width:1000px){.hero-inner{grid-template-columns:minmax(0,1fr);gap:36px}.hero-visual{max-width:420px}}@media(max-width:900px){.feature-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.cta-band{flex-direction:column;align-items:flex-start;padding:30px 26px}.admin-form,.tutor-workspace{grid-template-columns:minmax(0,1fr)}.tutor-chat-card{position:static}}@media(max-width:760px){:root{--gutter: 18px}.topbar-inner{flex-wrap:wrap;height:auto;padding-top:12px;padding-bottom:10px;gap:12px}.nav{order:3;width:100%;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}.nav::-webkit-scrollbar{display:none}.hero{padding:52px 0 56px}.hero-actions .btn{flex:1;justify-content:center}.hero-stats,.admin-stats{grid-template-columns:1fr}.stat{padding:18px 20px 20px}.section-block{padding-top:52px}.section-head{flex-direction:column;align-items:flex-start;gap:14px}.news-row{grid-template-columns:minmax(0,1fr);gap:8px}.news-row-title{white-space:normal}.news-row:hover{transform:none}.competition-card{grid-template-columns:minmax(0,1fr)}.competition-date{flex-direction:row;align-items:center;gap:10px;padding:16px 20px;border-right:0;border-bottom:1px solid var(--border)}.competition-date-label,.competition-date-year{display:none}.countdown{margin-top:0;margin-left:auto}.fact-grid{grid-template-columns:minmax(0,1fr)}.timeline{padding-left:0}.timeline:before,.timeline-item:before{display:none}.card-footer,.card-meta{flex-direction:column;align-items:flex-start;gap:12px}.term-hero{flex-direction:column;gap:16px}.learning-style-switcher{grid-template-columns:minmax(0,1fr);gap:12px;padding:14px}.learning-style-tabs{display:flex;overflow-x:auto;padding-bottom:3px;scrollbar-width:thin}.learning-style-tab{flex:0 0 min(300px,84vw)}.tutor-status-bar,.tutor-reading-foot{flex-direction:column;align-items:flex-start}.tutor-status-bar p{text-align:left}.tutor-reading-foot .btn{justify-content:center;width:100%}.tutor-card-head{flex-direction:column}.tutor-chat-log{max-height:440px}.tutor-composer>div{flex-direction:column;align-items:stretch}.tutor-composer .btn{justify-content:center}.path{padding-left:0}.path-node{position:static;margin-bottom:12px}.path-step:before{display:none}.path-card{padding:18px}.lesson-orientation,.path-example-block{padding:16px}.path-toolbar{flex-direction:column;align-items:flex-start;gap:10px}.socratic-card-head{flex-direction:column;padding:18px}.socratic-level-gate{padding:18px}.socratic-level-options{grid-template-columns:minmax(0,1fr)}.socratic-one-question{align-self:flex-start}.socratic-setup,.socratic-derivation{padding:18px}.socratic-question{grid-template-columns:34px minmax(0,1fr);gap:11px;margin:0 18px;padding:16px}.socratic-question-mark{width:34px;height:34px;border-radius:10px;font-size:18px}.socratic-question .prose p{font-size:15.5px}.socratic-answer-box{margin-right:18px;margin-left:18px}.socratic-answer-box>span{flex-direction:column;gap:3px}.socratic-actions,.socratic-hints{padding-right:18px;padding-left:18px}.socratic-hint{grid-template-columns:minmax(0,1fr);gap:5px}.socratic-complete-actions{flex-direction:column-reverse}.socratic-complete-actions .btn{justify-content:center;width:100%}.admin-login{grid-template-columns:minmax(0,1fr)}.to-top{right:16px;bottom:16px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
