pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{color:#abb2bf;background:#282c34}.hljs-comment,.hljs-quote{color:#5c6370;font-style:italic}.hljs-doctag,.hljs-keyword,.hljs-formula{color:#c678dd}.hljs-section,.hljs-name,.hljs-selector-tag,.hljs-deletion,.hljs-subst{color:#e06c75}.hljs-literal{color:#56b6c2}.hljs-string,.hljs-regexp,.hljs-addition,.hljs-attribute,.hljs-meta .hljs-string{color:#98c379}.hljs-attr,.hljs-variable,.hljs-template-variable,.hljs-type,.hljs-selector-class,.hljs-selector-attr,.hljs-selector-pseudo,.hljs-number{color:#d19a66}.hljs-symbol,.hljs-bullet,.hljs-link,.hljs-meta,.hljs-selector-id,.hljs-title{color:#61aeee}.hljs-built_in,.hljs-title.class_,.hljs-class .hljs-title{color:#e6c07b}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}.hljs-link{text-decoration:underline}@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2) format("woff2"),url(/assets/KaTeX_AMS-Regular-DMm9YOAa.woff) format("woff"),url(/assets/KaTeX_AMS-Regular-DRggAlZN.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Bold-ATXxdsX0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Regular-wX97UBjC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff) format("woff"),url(/assets/KaTeX_Fraktur-Bold-BdnERNNW.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff) format("woff"),url(/assets/KaTeX_Fraktur-Regular-CB_wures.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Main-Bold-Cx986IdX.woff2) format("woff2"),url(/assets/KaTeX_Main-Bold-Jm3AIy58.woff) format("woff"),url(/assets/KaTeX_Main-Bold-waoOVXN0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2) format("woff2"),url(/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff) format("woff"),url(/assets/KaTeX_Main-BoldItalic-DzxPMmG6.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2) format("woff2"),url(/assets/KaTeX_Main-Italic-BMLOBm91.woff) format("woff"),url(/assets/KaTeX_Main-Italic-3WenGoN9.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2) format("woff2"),url(/assets/KaTeX_Main-Regular-Dr94JaBh.woff) format("woff"),url(/assets/KaTeX_Main-Regular-ypZvNtVU.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2) format("woff2"),url(/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff) format("woff"),url(/assets/KaTeX_Math-BoldItalic-B3XSjfu4.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2) format("woff2"),url(/assets/KaTeX_Math-Italic-DA0__PXp.woff) format("woff"),url(/assets/KaTeX_Math-Italic-flOr_0UB.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff) format("woff"),url(/assets/KaTeX_SansSerif-Bold-CFMepnvq.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff) format("woff"),url(/assets/KaTeX_SansSerif-Italic-YYjJ1zSn.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff) format("woff"),url(/assets/KaTeX_SansSerif-Regular-BNo7hRIc.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Script-Regular-D3wIWfF6.woff2) format("woff2"),url(/assets/KaTeX_Script-Regular-D5yQViql.woff) format("woff"),url(/assets/KaTeX_Script-Regular-C5JkGWo-.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2) format("woff2"),url(/assets/KaTeX_Size1-Regular-C195tn64.woff) format("woff"),url(/assets/KaTeX_Size1-Regular-Dbsnue_I.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2) format("woff2"),url(/assets/KaTeX_Size2-Regular-oD1tc_U0.woff) format("woff"),url(/assets/KaTeX_Size2-Regular-B7gKUWhC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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) format("woff2"),url(/assets/KaTeX_Size3-Regular-CTq5MqoE.woff) format("woff"),url(/assets/KaTeX_Size3-Regular-DgpXs0kz.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2) format("woff2"),url(/assets/KaTeX_Size4-Regular-BF-4gkZK.woff) format("woff"),url(/assets/KaTeX_Size4-Regular-DWFBv043.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2) format("woff2"),url(/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff) format("woff"),url(/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf) format("truetype")}.katex{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;position:relative;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.18.1"}.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}.app{min-height:100vh;display:flex;flex-direction:column;padding-top:var(--header-height)}.header{background:var(--header-bg);height:var(--header-height);border-bottom:1px solid var(--border);position:fixed;top:0;left:0;width:100%;z-index:200;box-shadow:0 1px 3px #0000000d;transition:transform .3s ease}.header.header-hidden{transform:translateY(-100%)}.header-inner{max-width:1200px;margin:0 auto;height:100%;display:flex;align-items:center;justify-content:space-between;padding:0 16px}.header-left{display:flex;align-items:center;gap:16px}.drawer-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px 4px;flex-direction:column;gap:4px}.hamburger-line{display:block;width:20px;height:2px;background:var(--text-secondary);border-radius:1px;transition:all .2s}.logo{display:flex;align-items:center;gap:8px;font-size:20px;font-weight:700;color:var(--text)}.logo-icon{width:36px;height:36px;background:linear-gradient(135deg,#4a90d9,var(--primary));border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:16px;flex-shrink:0}.logo-text{background:linear-gradient(135deg,#3b82f6,#1a73e8,#2563eb);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-weight:800;letter-spacing:1px}.header-nav{display:flex;gap:4px}.header-nav a{padding:6px 14px;border-radius:8px;color:var(--text-secondary);font-size:14px;font-weight:500;position:relative}.header-nav a:hover{background:linear-gradient(180deg,#fff6,#f5f6f866);color:var(--text);text-decoration:none;box-shadow:inset 0 1px #ffffff80;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.header-nav a.active{background:linear-gradient(180deg,#1a73e81a,#1a73e80d);color:var(--primary);font-weight:600;text-decoration:none;border:1px solid rgba(26,115,232,.12);box-shadow:0 1px 3px #1a73e814,inset 0 1px #ffffff80;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.header-right{display:flex;align-items:center;gap:10px}.header-search{position:relative}.header-search input{padding:8px 12px 8px 34px;border:1px solid var(--border);border-radius:8px;font-size:14px;width:200px;outline:none;transition:border-color .2s;background:#f5f6f8}.header-search input:focus{border-color:var(--primary);background:#fff}.header-search-icon{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:8px;color:var(--text-secondary);transition:all .2s}.header-search-icon:hover{background:#f0f2f5;color:var(--primary)}.search-icon{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none;display:flex;align-items:center;justify-content:center}.btn{padding:8px 16px;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;border:none;transition:all .2s;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;text-decoration:none}a.btn:hover{text-decoration:none}.btn-primary{background:linear-gradient(180deg,#3b82f6,#2563eb);color:#fff;border:1px solid rgba(255,255,255,.15);box-shadow:0 1px 3px #2563eb33,inset 0 1px #fff3;transition:all .25s ease}.btn-primary:hover{background:linear-gradient(180deg,#4f8df7,#306eeb);border-color:#ffffff4d;box-shadow:0 2px 8px #2563eb4d,inset 0 1px #ffffff4d;transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:0 1px 3px #2563eb26}.btn-outline{background:linear-gradient(180deg,#fff6,#f8f9fb66);border:1px solid rgba(200,205,215,.4);color:var(--text);box-shadow:inset 0 1px #fff9;transition:all .25s ease}.btn-outline:hover{background:linear-gradient(180deg,#ffffffa6,#f8f9fb8c);border-color:#b4bec880;box-shadow:0 2px 8px #0000000d,inset 0 1px #fffc}.btn-login{position:relative;background:linear-gradient(180deg,#ffffff80,#f5f6f880);border:1px solid rgba(200,205,215,.35);color:var(--text);text-decoration:none;box-shadow:inset 0 1px #ffffffb3;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:all .3s cubic-bezier(.25,.8,.25,1.2)}.btn-login:hover{background:linear-gradient(180deg,#ffffffb3,#f5f6f8a6);border-color:#b4bec880;box-shadow:0 2px 8px #0000000f,inset 0 1px #fffc;transform:translateY(-1px)}.btn-signup{position:relative;background:linear-gradient(180deg,#1a73e81f,#1a73e80a);color:var(--primary);text-decoration:none;font-weight:600;border:1px solid rgba(26,115,232,.18);box-shadow:inset 0 1px #ffffff80;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:all .3s cubic-bezier(.25,.8,.25,1.2)}.btn-signup:hover{background:linear-gradient(180deg,#1a73e82e,#1a73e814);border-color:#1a73e84d;box-shadow:0 2px 8px #1a73e81a,inset 0 1px #fff9;transform:translateY(-1px)}.btn-user{position:relative;background:linear-gradient(180deg,#ffffff80,#f5f6f880);border:1px solid rgba(200,205,215,.35);color:var(--text);padding:5px 12px;border-radius:20px;box-shadow:inset 0 1px #ffffffb3;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:all .3s cubic-bezier(.25,.8,.25,1.2)}.btn-user:hover{background:linear-gradient(180deg,#ffffffb3,#f5f6f8a6);border-color:#b4bec880;box-shadow:0 2px 8px #0000000f,inset 0 1px #fffc;transform:translateY(-1px)}.user-avatar-small{width:24px;height:24px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:12px;font-weight:600}.user-name-small{font-size:13px}.btn-new-topic-plus{display:flex;align-items:center;justify-content:center}.btn-new-topic{position:relative;background:linear-gradient(180deg,#1a73e81f,#1a73e80a);color:var(--primary);font-weight:600;text-decoration:none;border:1px solid rgba(26,115,232,.18);box-shadow:inset 0 1px #ffffff80;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:all .3s cubic-bezier(.25,.8,.25,1.2)}.btn-new-topic:hover,.btn-new-topic:active,.btn-new-topic:focus{text-decoration:none;color:var(--primary)}.btn-new-topic:hover{background:linear-gradient(180deg,#1a73e82e,#1a73e814);border-color:#1a73e84d;box-shadow:0 2px 8px #1a73e81a,inset 0 1px #fff9;transform:translateY(-1px)}.btn-new-topic:active{transform:translateY(0);background:linear-gradient(180deg,#1a73e824,#1a73e80f);transition:all .1s ease}.drawer-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#0006;z-index:250;transition:opacity .3s}.drawer{position:fixed;top:0;left:0;width:280px;height:100%;background:#fff;z-index:300;transform:translate(-100%);transition:transform .3s ease;overflow-y:auto;box-shadow:2px 0 12px #00000026;scrollbar-width:none;-ms-overflow-style:none}.drawer::-webkit-scrollbar{display:none}.drawer.open{transform:translate(0)}.drawer-content{padding:0;display:flex;flex-direction:column;height:100%}.drawer-header{padding:20px 20px 12px;border-bottom:1px solid var(--border)}.drawer-header h2{font-size:20px;font-weight:800;background:linear-gradient(135deg,#667eea,#4a90d9 40%,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:1px}.drawer-search{position:relative;padding:12px 16px}.drawer-search input{width:100%;padding:9px 12px 9px 34px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none;background:#f5f6f8}.drawer-search input:focus{border-color:var(--primary);background:#fff}.drawer-search .search-icon{left:26px}.drawer-filter-bar{display:flex;align-items:center;gap:8px;padding:8px 16px;position:sticky;top:0;z-index:2;background:#fff}.drawer-filter-input-wrap{flex:1;position:relative;display:flex;align-items:center}.drawer-filter-icon{position:absolute;left:10px;color:var(--text-muted);pointer-events:none}.drawer-filter-input{width:100%;padding:7px 10px 7px 30px;border:1px solid var(--border);border-radius:8px;font-size:13px;outline:none;background:#f5f6f8;transition:border-color .2s,background .2s}.drawer-filter-input:focus{border-color:var(--primary);background:#fff}.drawer-toggle-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:1px solid var(--border);border-radius:8px;background:#f5f6f8;cursor:pointer;color:var(--text-secondary);transition:all .2s;flex-shrink:0;padding:0}.drawer-toggle-btn:hover{background:#e8eaed;color:var(--text);border-color:#c4c7cc}.drawer-nav{flex:1;overflow-y:auto;padding:8px 0;scrollbar-width:none;-ms-overflow-style:none}.drawer-nav::-webkit-scrollbar{display:none}.drawer-expand-toggle-inline{display:inline-flex;align-items:center;gap:4px;font-size:11px;color:var(--text-muted);cursor:pointer;transition:color .15s;-webkit-user-select:none;user-select:none;white-space:nowrap}.drawer-expand-toggle-inline:hover{color:var(--primary)}.drawer-expand-toggle-inline svg{flex-shrink:0}.drawer-cat-section{margin-bottom:4px}.drawer-cat-title{display:flex;align-items:center;gap:6px;padding:8px 20px 4px;font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;-webkit-user-select:none;user-select:none;transition:all .2s}.drawer-cat-title-link{color:var(--text-secondary);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:.5px}.drawer-cat-title-link:hover{color:var(--primary);text-decoration:none}.drawer-cat-list{display:flex;flex-direction:column}.drawer-cat-item{display:flex;align-items:center;gap:10px;padding:10px 20px 10px 30px;font-size:14px;color:var(--text-secondary);transition:background .15s;border-left:3px solid transparent}.drawer-cat-item:hover{background:#f5f6f8;color:var(--text);text-decoration:none}.drawer-cat-item.active{background:#e8f0fe;color:var(--primary);border-left-color:var(--primary);font-weight:600}.drawer-cat-icon{width:8px;height:8px;border-radius:50%;flex-shrink:0}.drawer-cat-name{flex:1}.drawer-cat-count{background:var(--bg);padding:2px 8px;border-radius:10px;font-size:12px;color:var(--text-muted);min-width:28px;text-align:center}.drawer-cat-item.active .drawer-cat-count{background:#d2e3fc;color:var(--primary)}.drawer-footer{padding:16px 20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-secondary);margin-top:auto}.main-container{max-width:1200px;margin:0 auto;padding:20px 16px;flex:1;width:100%;min-height:calc(100vh - var(--header-height) - 40px)}.main-with-sidebar{display:flex;gap:24px;align-items:flex-start;min-height:calc(100vh - var(--header-height) - 60px)}.sidebar-desktop{width:250px;flex-shrink:0;background:#fff;border:1px solid var(--border);border-radius:10px;overflow:hidden;position:sticky;top:var(--header-height);height:calc(100vh - var(--header-height));display:flex;flex-direction:column}.app.header-hidden .sidebar-desktop{top:10px;height:calc(100vh - 20px);transition:top .3s ease,height .3s ease}.sidebar-desktop .drawer-content{display:flex;flex-direction:column;height:100%;min-height:0}.sidebar-desktop .drawer-filter-bar{position:sticky;top:0;z-index:2;background:#fff}.sidebar-desktop .drawer-nav{flex:1;overflow-y:auto;padding:4px 0;scrollbar-width:none;-ms-overflow-style:none}.sidebar-desktop .drawer-nav::-webkit-scrollbar{display:none}.sidebar-desktop .drawer-header,.sidebar-desktop .drawer-search,.sidebar-desktop .drawer-footer{display:none}.content{flex:1;min-width:0}.topic-list-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:10px}.topic-list-header h2{font-size:20px;font-weight:700}.filter-tabs{display:flex;gap:4px;background:linear-gradient(180deg,#fff9,#f8f9fb99);border:1px solid rgba(200,205,215,.3);border-radius:10px;padding:3px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);box-shadow:0 1px 3px #00000008,inset 0 1px #fff9}.filter-tab{padding:6px 14px;border-radius:8px;font-size:13px;color:var(--text-secondary);cursor:pointer;border:none;background:transparent;font-family:inherit;font-weight:500;position:relative;z-index:1}.filter-tab:hover{color:var(--text);background:#ffffff80}.filter-tab.active{background:linear-gradient(180deg,#1a73e81f,#1a73e80f);color:var(--primary);font-weight:600;border:1px solid rgba(26,115,232,.12);box-shadow:0 1px 3px #1a73e81a,inset 0 1px #ffffff80;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.topic-list{list-style:none}.topic-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:16px;margin-bottom:10px;transition:box-shadow .2s}.topic-card:hover{box-shadow:0 2px 8px #0000000f}.topic-card-main{display:flex;gap:12px}.topic-avatar{width:40px;height:40px;border-radius:50%;color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:600;flex-shrink:0}.topic-info{flex:1;min-width:0}.topic-title{font-size:15px;font-weight:600;color:var(--text);margin-bottom:6px;line-height:1.4}.topic-title a{color:inherit}.topic-title a:hover{color:var(--primary);text-decoration:none}.topic-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--text-muted)}.topic-author-name{color:var(--text-muted);cursor:pointer;transition:color .15s;text-decoration:none}.topic-author-name:hover{color:var(--primary);text-decoration:underline!important}.topic-author-inline{display:inline-flex;align-items:center;gap:4px}.author-avatar-sm{width:18px;height:18px;border-radius:50%;color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:10px;font-weight:600}.topic-category-tag{background:var(--tag-bg);color:var(--tag-text);padding:2px 10px;border-radius:4px;font-size:12px;font-weight:500}.topic-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}.tag{display:inline-block;position:relative;padding:2px 12px 2px 14px;color:var(--text-muted);font-size:12px;border:1.5px solid #ff9800;color:#e65100}.topic-stats{display:flex;gap:16px;align-items:center;flex-shrink:0;color:var(--text-muted);font-size:13px}.topic-stat{text-align:center;min-width:45px}.topic-stat .num{font-weight:600;color:var(--text-secondary);font-size:15px}.topic-stat .label{font-size:11px}.topic-stat.replies .num{color:var(--primary)}.empty-state{text-align:center;padding:60px 20px;background:var(--card-bg);border:1px solid var(--border);border-radius:10px;color:var(--text-muted)}.empty-state h3{font-size:18px;margin-bottom:8px;color:var(--text-secondary)}.breadcrumb{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--text-muted);margin-bottom:14px;flex-wrap:wrap}.breadcrumb a{color:var(--text-muted)}.breadcrumb a:hover{color:var(--primary)}.breadcrumb .sep{color:var(--border)}.topic-detail-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:20px;margin-bottom:16px}.topic-detail-header{margin-bottom:16px}.announce-tag{display:inline-block;background:#e8f0fe;color:#1a73e8;padding:2px 10px;border-radius:4px;font-size:12px;font-weight:600;margin-bottom:8px}.topic-detail-header h1{font-size:22px;font-weight:700;line-height:1.3;margin-bottom:12px}.topic-detail-body{font-size:15px;line-height:1.8;color:var(--text)}.topic-detail-body p{margin-bottom:12px}.markdown-body h1{font-size:24px;font-weight:700;margin:24px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--border);color:#1a1a2e;line-height:1.4}.markdown-body h2{font-size:20px;font-weight:700;margin:20px 0 10px;padding-bottom:6px;border-bottom:1px solid var(--border);color:#1a1a2e;line-height:1.4}.markdown-body h3{font-size:17px;font-weight:600;margin:16px 0 8px;color:#2c3e50;line-height:1.5}.markdown-body h4{font-size:15px;font-weight:600;margin:14px 0 6px;color:#34495e;line-height:1.5}.markdown-body h5{font-size:14px;font-weight:600;margin:12px 0 6px;color:#4a5568;line-height:1.5}.markdown-body h6{font-size:13px;font-weight:600;margin:10px 0 6px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;line-height:1.5}.markdown-body>p{margin-bottom:14px}.markdown-body ul{margin:10px 0;padding-left:0;list-style:none}.markdown-body ul li{position:relative;padding-left:22px;margin-bottom:6px;line-height:1.8}.markdown-body ul li:before{content:"";position:absolute;left:4px;top:11px;width:6px;height:6px;background:var(--primary);border-radius:50%;opacity:.7}.markdown-body ol{margin:10px 0;padding-left:0;list-style:none;counter-reset:md-ol}.markdown-body ol li{position:relative;padding-left:24px;margin-bottom:6px;line-height:1.8;counter-increment:md-ol}.markdown-body ol li:before{content:counter(md-ol) ".";position:absolute;left:2px;top:0;color:var(--primary);font-weight:600;font-size:14px}.markdown-body blockquote{margin:14px 0;padding:10px 16px;border-left:4px solid var(--primary);background:#f8f9fc;color:#4a5568;font-style:italic;border-radius:0 6px 6px 0}.markdown-body blockquote p{margin:0}.markdown-body code:not(pre code){background:#f0f2f5;color:#e74c3c;padding:2px 6px;border-radius:4px;font-size:.9em;font-family:SF Mono,Fira Code,Consolas,Monaco,monospace}.markdown-body pre{margin:14px 0;padding:16px;background:#1e1e2e;border-radius:8px;overflow-x:auto;line-height:1.6;position:relative}.markdown-body pre code{font-size:13px;font-family:SF Mono,Fira Code,Consolas,Monaco,monospace;color:#cdd6f4;background:none;padding:0}.markdown-body table{width:100%;margin:14px 0;border-collapse:collapse;font-size:14px;overflow-x:auto;display:block}.markdown-body thead{background:#f8f9fc}.markdown-body th{padding:10px 14px;text-align:left;font-weight:600;color:#1a1a2e;border-bottom:2px solid var(--border);white-space:nowrap}.markdown-body td{padding:9px 14px;border-bottom:1px solid var(--border);color:var(--text)}.markdown-body tbody tr:hover{background:#f8f9fc}.markdown-body hr{margin:20px 0;border:none;border-top:2px solid var(--border);opacity:.6}.markdown-body a{color:var(--primary);text-decoration:underline;word-break:break-all}.markdown-body a:hover{color:#6c5ce7}.markdown-body img{max-width:100%;border-radius:8px;margin:10px 0}.markdown-body input[type=checkbox]{margin-right:6px;accent-color:var(--primary)}.markdown-body .footnote{font-size:13px;color:var(--text-muted);border-top:1px solid var(--border);margin-top:20px;padding-top:10px}.markdown-body .math-block{overflow-x:auto;text-align:center;padding:16px 8px;margin:14px 0;background:#fafbfd;border-left:3px solid var(--primary);border-right:3px solid var(--primary);border-radius:8px}.markdown-body .katex{font-size:1.05em}.markdown-body .math-block .katex{font-size:1.15em}.content-link{color:var(--primary);text-decoration:underline;word-break:break-all}.content-link:hover{color:var(--primary-hover)}.content-image{max-width:100%;max-height:400px;border-radius:8px;margin:8px 0;display:block;border:1px solid #e8ecf1}.content-iframe-wrap{position:relative;width:100%;max-width:800px;margin:12px 0;border-radius:8px;overflow:hidden;border:1px solid #e8ecf1;background:#000}.content-iframe-wrap iframe{display:block;width:100%;height:400px;border:none}@media (max-width: 600px){.content-iframe-wrap iframe{height:240px}}.replies-section{margin-top:8px}.replies-section h3{font-size:17px;font-weight:600;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--primary);display:flex;align-items:center;gap:8px}.replies-count{background:var(--primary);color:#fff;font-size:12px;padding:2px 8px;border-radius:10px}.no-replies{text-align:center;padding:40px;color:var(--text-muted)}.reply-tree-node{position:relative}.reply-tree-node.depth-1,.reply-tree-node.depth-2,.reply-tree-node.depth-3,.reply-tree-node.depth-4,.reply-tree-node.depth-5{margin-left:28px;border-left:2px solid #e8ecf1;padding-left:16px}.reply-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:14px 16px;margin-bottom:8px}.reply-header{display:flex;align-items:center;gap:10px;margin-bottom:10px}.reply-avatar{width:32px;height:32px;border-radius:50%;color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0}.reply-header-info{display:flex;flex-direction:column}.reply-user{font-weight:600;font-size:13px}.reply-time{font-size:11px;color:var(--text-muted)}.reply-body{font-size:14px;line-height:1.7;color:var(--text);margin-bottom:8px}.reply-actions{display:flex;gap:8px}.reply-action-btn{background:none;border:none;font-size:12px;color:var(--text-muted);cursor:pointer;padding:3px 8px;border-radius:4px;transition:all .15s}.reply-action-btn:hover{background:#f0f2f5;color:var(--primary)}.reply-children{margin-top:4px}.inline-reply-form{margin:4px 0 12px;padding:12px;background:#f8f9fb;border:1px solid var(--border);border-radius:8px}.inline-reply-form textarea{width:100%;min-height:60px;border:1px solid var(--border);border-radius:6px;padding:8px 10px;font-size:13px;font-family:inherit;resize:vertical;outline:none;transition:border-color .2s}.inline-reply-form textarea:focus{border-color:var(--primary)}.inline-reply-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:8px}.btn-sm{padding:5px 12px;font-size:12px;border-radius:6px}.reply-form{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:20px;margin-top:16px}.reply-form h4{font-size:15px;font-weight:600;margin-bottom:12px}.reply-form textarea{width:100%;min-height:110px;border:1px solid var(--border);border-radius:8px;padding:12px;font-size:14px;font-family:inherit;resize:vertical;outline:none;transition:border-color .2s}.reply-form textarea:focus{border-color:var(--primary)}.reply-form-actions{display:flex;justify-content:flex-end;margin-top:12px}.form-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:24px;max-width:800px}.form-card h2{font-size:22px;font-weight:700;margin-bottom:20px}.form-group{margin-bottom:18px}.form-group label{display:block;font-size:14px;font-weight:600;margin-bottom:6px;color:var(--text)}.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:inherit;outline:none;transition:border-color .2s}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #1a73e81a}.form-group textarea{min-height:200px;resize:vertical}.form-group .hint{font-size:12px;color:var(--text-muted);margin-top:4px}.form-label-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.form-label-link{font-size:13px;color:var(--primary)}.checkbox-label{display:flex!important;align-items:center;gap:8px;font-weight:400!important;cursor:pointer;font-size:13px}.checkbox-label input[type=checkbox]{width:auto!important}.form-actions{display:flex;gap:10px;justify-content:flex-end}.group-selector{display:flex;gap:10px;margin-bottom:12px}.group-select-btn{display:flex;align-items:center;gap:8px;padding:10px 18px;border:2px solid var(--border);border-radius:10px;background:#fff;font-size:14px;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all .2s;font-family:inherit}.group-select-btn:hover{border-color:var(--primary);color:var(--primary);background:#f0f5ff}.group-select-btn.active{border-color:var(--primary);color:var(--primary);background:#e8f0fe;font-weight:600;box-shadow:0 0 0 3px #1a73e81a}.group-select-icon{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:8px;background:#f0f2f5;flex-shrink:0}.group-select-btn.active .group-select-icon{background:#d2e3fc;color:var(--primary)}.subcat-selector{background:#f8f9fb;border:1px solid var(--border);border-radius:10px;padding:14px 16px;animation:fadeInDown .2s ease}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.subcat-label{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px}.subcat-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:8px;height:120px;overflow-y:auto;padding:1px}.subcat-btn{display:flex;align-items:center;gap:8px;height:50px;box-sizing:border-box;padding:5px 14px;border:1.5px solid #e8ecf1;border-radius:8px;background:#fff;cursor:pointer;transition:all .2s;font-family:inherit;text-align:left}.subcat-btn:hover{border-color:var(--cat-color, var(--primary));background:#fafbfc;transform:translateY(-1px);box-shadow:0 2px 6px #0000000f}.subcat-btn.active{border-color:var(--cat-color, var(--primary));background:#fff;box-shadow:0 0 0 3px color-mix(in srgb,var(--cat-color, var(--primary)) 15%,transparent);font-weight:500}.subcat-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.subcat-list::-webkit-scrollbar{width:5px}.subcat-list::-webkit-scrollbar-track{background:transparent}.subcat-list::-webkit-scrollbar-thumb{background:#d0d5dd;border-radius:3px}.subcat-list::-webkit-scrollbar-thumb:hover{background:#b0b5bd}.subcat-name{font-size:14px;font-weight:500;color:var(--text)}.subcat-desc{font-size:12px;color:var(--text-muted);margin-left:auto}.tag-input-container{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:10px 14px;border:1px solid var(--border);border-radius:8px;background:#fff;min-height:46px;transition:border-color .2s;cursor:text}.tag-input-container:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px #1a73e81a}.tag-badge{display:inline-flex;align-items:center;gap:4px;padding:4px 8px 4px 12px;border-radius:20px;font-size:13px;font-weight:500;border:1px solid;white-space:nowrap;animation:tagIn .2s ease}@keyframes tagIn{0%{opacity:0;transform:scale(.85)}to{opacity:1;transform:scale(1)}}.tag-badge-remove{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:50%;border:none;background:#0000001a;color:inherit;font-size:14px;cursor:pointer;line-height:1;padding:0;transition:background .15s;flex-shrink:0}.tag-badge-remove:hover{background:#0003}.tag-input-inline{flex:1;min-width:140px;border:none;outline:none;font-size:14px;font-family:inherit;padding:4px 0;background:transparent;color:var(--text)}.tag-input-inline::placeholder{color:#b0b5bb;font-size:13px}.tag-count-hint{font-weight:500;color:var(--text-secondary)}.auth-page{display:flex;justify-content:center;align-items:center;min-height:calc(100vh - 160px);padding:20px}.auth-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:32px;width:100%;max-width:420px;box-shadow:0 4px 24px #0000000f}.auth-header{text-align:center;margin-bottom:24px}.auth-logo{display:inline-block;margin-bottom:16px}.auth-header h2{font-size:22px;font-weight:700;margin-bottom:6px}.auth-subtitle{font-size:14px;color:var(--text-muted)}.auth-error{background:#fff0f0;color:#e74c3c;padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:16px;border:1px solid #fdd}.auth-submit{width:100%;justify-content:center;padding:12px;font-size:15px;font-weight:600;margin-top:8px}.auth-divider{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--text-muted);font-size:12px}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--border)}.auth-social{display:flex;gap:10px}.social-btn{flex:1;justify-content:center;font-size:13px;padding:10px}.social-icon{font-weight:700;font-size:15px}.auth-footer{text-align:center;margin-top:20px;font-size:13px;color:var(--text-muted)}.auth-footer a{color:var(--primary);font-weight:500}.pagination{display:flex;justify-content:center;gap:6px;margin-top:20px}.pagination button{padding:6px 12px;border:1px solid var(--border);border-radius:6px;background:var(--card-bg);cursor:pointer;font-size:13px;color:var(--text-secondary);transition:all .15s}.pagination button:hover{background:#f0f2f5}.pagination button.active{background:var(--primary);color:#fff;border-color:var(--primary)}.group-banner{display:flex;align-items:center;gap:24px;background:#f5f7fa;border:1px solid var(--border);border-radius:12px;padding:24px 28px;margin-bottom:24px}.group-banner-svg{width:200px;height:140px;flex-shrink:0}.group-banner-svg svg{width:100%;height:100%}.group-banner-text{flex:1;min-width:0}.group-banner-text h1{font-size:24px;font-weight:700;margin-bottom:6px;color:var(--text)}.group-banner-text p{font-size:14px;color:var(--text-secondary);line-height:1.6;margin-bottom:10px;max-width:500px}.group-banner-stats{font-size:13px;color:var(--text-muted);display:flex;gap:8px;align-items:center}.sep-dot{opacity:.5}.group-masonry{columns:3;column-gap:16px}.masonry-column{break-inside:avoid;margin-bottom:16px}.masonry-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:18px}.masonry-card-header{display:flex;align-items:center;gap:10px;margin-bottom:8px}.masonry-cat-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.masonry-cat-name{font-size:15px;font-weight:600;color:var(--text);transition:color .15s}.masonry-cat-name:hover{color:var(--primary)}.masonry-cat-count{margin-left:auto;font-size:12px;color:var(--text-muted);background:var(--bg);padding:2px 8px;border-radius:10px;white-space:nowrap}.masonry-cat-desc{font-size:13px;color:var(--text-muted);margin-bottom:12px;line-height:1.5}.masonry-topics{border-top:1px solid var(--border);padding-top:12px;margin-bottom:12px}.masonry-topics-title{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}.masonry-topic-list{list-style:none}.masonry-topic-list li{margin-bottom:8px;padding-bottom:8px;border-bottom:1px dashed var(--border)}.masonry-topic-list li:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.masonry-topic-link{display:block;font-size:13px;font-weight:500;color:var(--text);line-height:1.4;margin-bottom:3px;transition:color .15s}.masonry-topic-link:hover{color:var(--primary);text-decoration:none}.masonry-topic-meta{font-size:11px;color:var(--text-muted)}.masonry-cat-more{display:inline-block;font-size:12px;color:var(--primary);font-weight:500;transition:color .15s}.masonry-cat-more:hover{color:var(--primary-hover);text-decoration:none}@media (min-width: 900px){.drawer,.drawer-overlay,.drawer-toggle{display:none!important}}@media (max-width: 899px){.sidebar-desktop{display:none}.main-with-sidebar{display:block}.drawer-toggle{display:flex}.header-nav,.btn-new-topic-text,.topic-stats{display:none}}@media (max-width: 600px){.header{height:52px}.logo-text{display:none}.btn{padding:6px 12px;font-size:13px}.btn-login,.btn-signup{padding:6px 10px;font-size:12px}.main-container{padding:12px 10px}.topic-card{padding:12px;border-radius:8px}.topic-detail-card{padding:14px}.topic-detail-header h1{font-size:18px}.reply-tree-node.depth-2,.reply-tree-node.depth-3,.reply-tree-node.depth-4,.reply-tree-node.depth-5,.reply-tree-node.depth-1{margin-left:14px;padding-left:10px}.group-banner{flex-direction:column;padding:16px;gap:12px}.group-banner-svg{width:160px;height:110px}.group-banner-text h1{font-size:18px}.group-banner-text p{font-size:13px}.group-masonry{columns:1}.auth-card{padding:20px 16px}.auth-social{flex-direction:column}.topic-list-header{flex-direction:column;align-items:flex-start}}@media (min-width: 601px) and (max-width: 899px){.group-masonry{columns:2}}.resource-links-card{background:#fff;border:1px solid #e2e6ed;border-radius:12px;overflow:hidden;margin-bottom:20px;box-shadow:0 2px 8px #0000000a;transition:box-shadow .2s}.resource-links-card:hover{box-shadow:0 4px 16px #00000014}.resource-links-title{display:flex;align-items:center;gap:8px;padding:16px 20px;margin:0;font-size:15px;font-weight:600;color:#1a1a2e;background:linear-gradient(135deg,#f0f4ff,#f8fbff);border-bottom:1px solid #e8ecf4}.resource-links-title-icon{font-size:18px}.resource-links-count{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 7px;border-radius:11px;background:linear-gradient(135deg,#1a73e8,#4a90d9);color:#fff;font-size:12px;font-weight:600;margin-left:auto}.resource-links-list{list-style:none;padding:0;margin:0}.resource-link-item{display:flex;align-items:center;gap:14px;padding:14px 20px;border-bottom:1px solid #f3f3f8;transition:background .2s}.resource-link-item:last-child{border-bottom:none}.resource-link-item:hover{background:#fafbff}.resource-link-icon{width:42px;height:42px;border-radius:10px;background:#f0f4ff;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}.resource-link-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.resource-link-top{display:flex;align-items:center;gap:8px}.resource-link-label{font-size:14px;font-weight:600;color:#1a1a2e}.resource-link-badge{display:inline-flex;align-items:center;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:500;white-space:nowrap}.resource-link-url-text{font-size:12px;color:#8a8d91;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;font-family:SF Mono,Menlo,Cascadia Code,monospace}.resource-link-actions{display:flex;gap:6px;flex-shrink:0}.resource-link-action-btn{display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:7px 12px;border-radius:8px;font-size:12px;font-weight:500;border:none;cursor:pointer;transition:all .2s;background:#f0f2f5;color:#5f6368;white-space:nowrap}.resource-link-action-btn:hover{background:#e4e7ed}.resource-link-action-primary{background:#e8f0fe;color:#1a73e8}.resource-link-action-primary:hover{background:#1a73e8;color:#fff}.resource-link-vote-btn{display:inline-flex;align-items:center;gap:3px;padding:5px 8px;border-radius:6px;font-size:12px;font-weight:500;border:1px solid #e0e3e7;cursor:pointer;transition:all .2s;background:#f8f9fb;color:#5f6368;white-space:nowrap;font-family:inherit}.resource-link-vote-btn:hover{background:#e8f0fe;color:#1a73e8;border-color:#bfdbfe}.resource-link-vote-btn.voted-up{background:#dbeafe;color:#2563eb;border-color:#bfdbfe}.resource-link-vote-btn.voted-down{background:#fee2e2;color:#dc2626;border-color:#fecaca}.resource-link-vote-btn.voted-up:hover{background:#bfdbfe}.resource-link-vote-btn.voted-down:hover{background:#fecaca}.scroll-sentinel{height:1px}.loading-more{text-align:center;padding:20px;color:#8a8d91;font-size:14px}.no-more{text-align:center;padding:24px 20px 12px;color:#b0b5bb;font-size:13px}.load-more-wrap{text-align:center;padding:16px 0 8px}.load-more-btn{padding:10px 32px!important;font-size:14px!important;border-radius:8px!important}.vote-section-unified{background:linear-gradient(135deg,#fffdf0,#fff9e6);border:2px solid #f0d060;border-radius:12px;padding:16px 20px;margin-bottom:20px;max-height:360px;overflow:hidden}.vote-section-header{display:flex;align-items:center;gap:12px;margin-bottom:10px}.vote-section-header h3{font-size:16px;font-weight:700;color:#5a4a00;margin:0}.vote-section-title-link{text-decoration:none;color:inherit}.vote-section-title-link:hover{text-decoration:none}.vote-section-title-link:hover h3{color:var(--primary)}.vote-section-hint{font-size:12px;color:#8a7a30}.vote-section-more{font-size:13px;color:var(--primary);font-weight:500;margin-left:auto}.vote-section-more:hover{text-decoration:underline}.vote-items-preview{max-height:260px;overflow-y:auto}.vote-preview-item{display:flex;align-items:center;gap:8px;padding:7px 0;border-bottom:1px solid #f5f0d0;font-size:13px}.vote-preview-item:last-child{border-bottom:none}.vote-preview-badge{background:#fff3cd;color:#856404;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600;white-space:nowrap;flex-shrink:0}.vote-preview-type{padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600;white-space:nowrap;flex-shrink:0;min-width:36px;text-align:center}.vote-preview-type.type-topic{background:#dbeafe;color:#1e40af}.vote-preview-type.type-user{background:#fce7f3;color:#9d174d}.vote-preview-name{flex-shrink:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500;color:#1a1a2e;min-width:0}.vote-preview-name:hover{color:var(--primary)}.vote-preview-bar{display:flex;align-items:center;flex:1;min-width:150px;margin-left:auto}.vote-preview-footer{text-align:center;padding:8px 0 0;font-size:13px;color:#8a8a30}.vote-preview-footer a{color:var(--primary);font-weight:500}.vote-preview-footer a:hover{text-decoration:underline}.vote-page-header{display:flex;align-items:center;gap:12px;margin-bottom:20px}.vote-page-header h2{font-size:20px;font-weight:700;margin:0}.vote-page-total{font-size:13px;color:#8a8d91}.vote-items-list{display:flex;flex-direction:column;gap:12px}.vote-full-item{background:#fff;border:1px solid #e0e3e7;border-radius:10px;padding:16px;transition:box-shadow .2s}.vote-full-item:hover{box-shadow:0 2px 8px #0000000f}.vote-full-header{display:flex;align-items:center;gap:8px;margin-bottom:10px}.vote-full-name{font-size:15px;font-weight:600;color:#1a1a2e;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.vote-full-name:hover{color:var(--primary)}.vote-full-bar-wrap{margin-bottom:12px}.vote-full-actions{display:flex;gap:10px;align-items:center}.vote-voted-hint{font-size:13px;color:#16a34a;font-weight:500;padding:8px 12px;background:#f0fdf4;border-radius:8px}.topic-vote-bar{margin-top:6px}.vote-bar-track{display:inline-flex;height:5px;border-radius:3px;overflow:hidden;background:#e8ecf1;vertical-align:middle}.vote-bar-positive{background:linear-gradient(90deg,#3b82f6,#2563eb)}.vote-bar-negative{background:linear-gradient(90deg,#ef4444,#dc2626)}.vote-bar-labels{display:flex;align-items:center;font-size:11px}.vote-bar-positive-label{color:#2563eb;font-size:11px;white-space:nowrap}.vote-bar-negative-label{color:#dc2626;font-size:11px;white-space:nowrap}.vote-bar-time{color:#8a8d91;font-size:10px;white-space:nowrap}.vote-panel{background:linear-gradient(135deg,#fffdf0,#fff9e6);border:2px solid #f0d060;border-radius:12px;padding:20px;margin-bottom:16px}.vote-panel-header{display:flex;align-items:center;gap:10px;margin-bottom:12px}.vote-panel-icon{font-size:28px}.vote-panel-title{display:flex;flex-direction:column}.vote-panel-title strong{font-size:16px;color:#5a4a00}.vote-panel-expiry{font-size:12px;color:#8a7a30;margin-top:2px}.vote-panel-desc{font-size:14px;color:#5f6368;margin:0 0 14px}.vote-panel-voted{display:flex;align-items:center;justify-content:center;gap:8px;padding:12px;background:#f0fdf4;border-radius:8px;font-size:14px;color:#166534;margin-bottom:12px}.vote-panel-voted-icon{display:flex;align-items:center;color:#16a34a}.vote-bar-wrap{margin-bottom:16px}.vote-bar-slanted{display:flex;height:34px;position:relative;border-radius:6px;overflow:hidden}.vote-bar-slanted-positive{background:linear-gradient(90deg,#3b82f6,#2563eb);clip-path:polygon(0 0,calc(100% - 7px) 0,100% 100%,0 100%);display:flex;align-items:center;justify-content:center;min-width:0;transition:width .3s ease;flex-shrink:0}.vote-bar-slanted-negative{background:linear-gradient(90deg,#dc2626,#b91c1c);clip-path:polygon(7px 0,100% 0,100% 100%,0 100%);display:flex;align-items:center;justify-content:center;min-width:0;transition:width .3s ease;flex-shrink:0}.vote-bar-inner-label{font-size:13px;font-weight:700;color:#fff;white-space:nowrap;text-shadow:0 1px 2px rgba(0,0,0,.2)}.vote-bar-counts-outer{display:flex;justify-content:space-between;margin-top:8px;padding:0 2px}.vote-bar-count-item{font-size:13px;font-weight:500;display:flex;align-items:center;gap:4px}.vote-bar-count-item strong{font-size:15px}.vote-bar-count-positive{color:#2563eb}.vote-bar-count-negative{color:#dc2626}.vote-panel-actions{display:flex;gap:12px}.vote-btn{flex:1;padding:12px 20px;border-radius:10px;border:none;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:8px}.vote-btn:disabled{opacity:.5;cursor:not-allowed}.vote-btn-positive{background:#dbeafe;color:#1e40af;border:1px solid #bfdbfe}.vote-btn-positive:hover:not(:disabled){background:#2563eb;color:#fff}.vote-btn-negative{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}.vote-btn-negative:hover:not(:disabled){background:#ef4444;color:#fff}.vote-panel-login-hint{text-align:center;font-size:13px;color:#8a8d91;padding:8px 0}.vote-panel-login-hint a{color:var(--primary);font-weight:500}.report-btn{background:none;border:1px solid #e0e3e7;color:#8a8d91;padding:3px 10px;border-radius:6px;font-size:12px;cursor:pointer;transition:all .2s;margin-left:auto}.report-btn:hover{background:#fef2f2;border-color:#fecaca;color:#ef4444}.report-dialog{max-width:460px;padding:28px 28px 0}.report-topic-title{background:#f8f9fa;padding:10px 14px;border-radius:8px;font-size:14px;color:#1a1a2e;margin-bottom:16px;font-weight:500}.report-reasons{display:grid;grid-template-columns:1fr 1fr;gap:8px}.report-reason-btn{padding:10px 14px;border:1.5px solid #e0e3e7;border-radius:8px;background:#fff;font-size:13px;cursor:pointer;transition:all .2s;text-align:center;color:#5f6368;font-family:inherit}.report-reason-btn:hover{border-color:var(--primary);color:var(--primary);background:#f0f5ff}.report-reason-btn.active{border-color:var(--primary);background:#e8f0fe;color:var(--primary);font-weight:600;box-shadow:0 0 0 3px #1a73e81a}.report-error-hint{margin-top:10px;padding:8px 12px;border-radius:6px;font-size:13px;color:#ff3b30;background:#fff0ef;text-align:center;animation:report-error-shake .35s ease}@keyframes report-error-shake{0%,to{transform:translate(0)}20%{transform:translate(-6px)}40%{transform:translate(6px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}.report-dialog-actions{display:flex;gap:0;margin:20px 0 0}.report-action-btn{flex:1;height:48px;border:none;background:none;font-size:16px;cursor:pointer;font-family:inherit;transition:all .2s ease;padding:0}.report-action-btn:disabled{opacity:.4;cursor:not-allowed}.report-action-cancel{background:linear-gradient(180deg,#8e8e9314,#8e8e9305);color:#495057;font-weight:500;border-right:.5px solid #c6c6c8;box-shadow:0 0 2px #000}.report-action-cancel:hover{background:linear-gradient(180deg,#8e8e9324,#8e8e930d)}.report-action-submit{background:linear-gradient(180deg,#ef4444,#dc2626);color:#fff;font-weight:600;box-shadow:0 1px 3px #dc262633,inset 0 1px #ffffff26}.report-action-submit:hover{background:linear-gradient(180deg,#f25555,#e02c2c);box-shadow:0 2px 6px #dc26264d,inset 0 1px #fff3}.report-action-submit:disabled{opacity:.5}.report-action-continue{background:linear-gradient(180deg,#ff3b30,#ff2b30);color:#fff;font-weight:600;box-shadow:0 1px 3px #2563eb33,inset 0 1px #ffffff26}.report-action-continue:hover{background:linear-gradient(180deg,#f03b30,#f01b30);box-shadow:0 2px 6px #2563eb4d,inset 0 1px #fff3}.btn-danger{background:#ef4444!important}.btn-danger:hover{background:#dc2626!important}.verified-tag{display:inline-block;background:#dcfce7;color:#166534;padding:2px 10px;border-radius:4px;font-size:12px;font-weight:600;margin-bottom:8px}.topic-card-vote{border-color:#f0d060}.risk-dialog-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:9999;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.risk-dialog{background:#fff;border-radius:16px;padding:32px;max-width:420px;width:90%;text-align:center;box-shadow:0 20px 60px #0003;animation:riskDialogIn .2s ease-out}@keyframes riskDialogIn{0%{opacity:0;transform:scale(.95) translateY(-10px)}to{opacity:1;transform:scale(1) translateY(0)}}.risk-dialog-icon{font-size:48px;margin-bottom:12px}.risk-dialog h3{margin:0 0 8px;font-size:18px;color:#1a1a2e}.risk-dialog-warning{font-size:14px;color:#5f6368;margin:0 0 20px;line-height:1.5}.risk-dialog-url{background:#f8f9fa;border-radius:8px;padding:12px 16px;margin-bottom:24px;text-align:left}.risk-dialog-label{display:block;font-size:13px;font-weight:500;color:#1a73e8;margin-bottom:4px}.risk-dialog-link{display:block;font-size:12px;color:#8a8d91;word-break:break-all;cursor:default;text-decoration:none}.risk-dialog-actions{display:flex;gap:0;margin:24px 0 0}.header-user-dropdown{position:relative}.user-dropdown-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:200px;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 8px 24px #0000001f;padding:6px;z-index:500;animation:dropdownFadeIn .15s ease}@keyframes dropdownFadeIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.dropdown-user-info{display:flex;align-items:center;gap:10px;padding:10px 10px 8px}.dropdown-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:600;flex-shrink:0}.dropdown-user-detail{display:flex;flex-direction:column;gap:2px}.dropdown-username{font-size:14px;font-weight:600;color:var(--text)}.dropdown-divider{height:1px;background:var(--border);margin:4px 6px}.dropdown-item{display:flex;align-items:center;gap:8px;width:100%;padding:9px 12px;border:none;background:transparent;border-radius:8px;font-size:14px;color:var(--text);cursor:pointer;transition:background .15s;text-align:left}.dropdown-item:hover{background:#f5f6f8}.dropdown-item-danger{color:#e74c3c}.dropdown-item-danger:hover{background:#fef2f2}.role-tag{display:inline-flex;align-items:center;padding:1px 7px;border-radius:10px;font-size:11px;font-weight:600;margin-left:4px;line-height:1.6}.role-tag-admin{background:#fef2f2;color:#e74c3c;border:1px solid #fecaca}.role-tag-vip{background:#fffbeb;color:#d97706;border:1px solid #fde68a}.role-tag-svip{background:#f5f3ff;color:#7c3aed;border:1px solid #ddd6fe}.profile-page{max-width:600px}.profile-card{background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden}.profile-header{display:flex;align-items:center;gap:16px;padding:28px 24px 20px;background:linear-gradient(135deg,#667eea15,#764ba215);border-bottom:1px solid var(--border)}.profile-avatar{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:28px;font-weight:700;flex-shrink:0}.profile-info{display:flex;flex-direction:column;gap:4px}.profile-name{font-size:22px;font-weight:700;margin:0}.profile-role{display:inline-flex;align-items:center;padding:2px 10px;border-radius:10px;font-size:12px;font-weight:600;border:1px solid;width:fit-content}.profile-details{padding:16px 24px 20px}.profile-detail-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid #f0f2f5}.profile-detail-row:last-child{border-bottom:none}.profile-detail-label{font-size:14px;color:#8a8d91}.profile-detail-value{font-size:14px;color:var(--text)}.form-group .hint{font-size:12px;color:#8a8d91;margin-top:4px}.expand-more-btn{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border:1px dashed var(--border);border-radius:8px;background:#fafbfc;font-size:14px;color:var(--text-secondary);cursor:pointer;transition:all .2s;font-family:inherit}.expand-more-btn:hover{border-color:var(--primary);color:var(--primary);background:#f0f5ff}.expand-arrow{display:inline-block;font-size:10px;transition:transform .2s}.expand-arrow.open{transform:rotate(90deg)}.expand-link-count{font-size:12px;background:#e8f0fe;color:var(--primary);padding:2px 8px;border-radius:10px;font-weight:500}.expand-section{animation:expandIn .2s ease}@keyframes expandIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.link-table{border:1px solid var(--border);border-radius:8px;overflow:hidden;background:#fff}.link-table-header{display:flex;align-items:center;background:#f8f9fb;border-bottom:1px solid var(--border);padding:10px 14px;font-size:12px;font-weight:600;color:var(--text-muted);gap:8px}.link-th-title{flex:1;min-width:0}.link-th-url{flex:2;min-width:0}.link-th-action{width:32px;flex-shrink:0}.link-table-row{display:flex;align-items:center;gap:8px;padding:8px 14px;border-bottom:1px solid #f0f2f5;transition:background .15s}.link-table-row:last-child{border-bottom:none}.link-table-row:hover{background:#fafbfd}.link-input-title{flex:1;min-width:0;padding:8px 10px;border:1px solid #e0e3e7;border-radius:6px;font-size:13px;font-family:inherit;outline:none;transition:border-color .2s}.link-input-title:focus{border-color:var(--primary)}.link-input-url{flex:2;min-width:0;padding:8px 10px;border:1px solid #e0e3e7;border-radius:6px;font-size:13px;font-family:inherit;outline:none;transition:border-color .2s}.link-input-url:focus{border-color:var(--primary)}.link-remove-btn{width:28px;height:28px;border:none;background:none;color:#c0c4cc;font-size:18px;cursor:pointer;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}.link-remove-btn:hover:not(:disabled){background:#fef2f2;color:#ef4444}.link-remove-btn:disabled{opacity:.3;cursor:not-allowed}.add-link-btn{display:inline-flex;align-items:center;gap:4px;margin-top:8px;padding:7px 14px;border:1px dashed #c0c4cc;border-radius:6px;background:#fff;font-size:13px;color:var(--text-secondary);cursor:pointer;transition:all .2s;font-family:inherit}.add-link-btn:hover{border-color:var(--primary);color:var(--primary);background:#f0f5ff}.add-link-btn-batch{border-style:solid;border-color:#e0e3e7;color:#6366f1}.add-link-btn-batch:hover{border-color:#6366f1;color:#4338ca;background:#f0f2ff}.topic-card-desc{font-size:13px;color:var(--text-muted);line-height:1.4;margin-top:4px;margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.topic-tags-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}.topic-tag-item{display:inline-block;position:relative;padding:3px 14px 3px 16px;font-size:11px;font-weight:600;background:#fff;color:#e65100;text-decoration:none;cursor:pointer;transition:all .2s;border:1.5px solid #ff9800}.topic-tag-item:hover{background:#fff3e0;border-color:#f57c00;color:#bf360c;text-decoration:none;transform:translateY(-1px)}.topic-tag-item:hover:after{background:#f57c00}.topic-detail-description{background:#f8fafc;border:1px solid #e2e8f0;border-left:3px solid var(--primary);border-radius:6px;padding:10px 14px;margin-bottom:16px}.topic-detail-desc-label{font-size:11px;font-weight:600;color:var(--primary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px}.topic-detail-description p{font-size:14px;line-height:1.6;color:var(--text-secondary);margin:0}.admin-tabs{display:flex;gap:0;background:#fff;border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-bottom:16px}.admin-tab{flex:1;padding:12px 20px;border:none;background:#fafbfc;font-size:14px;font-weight:500;color:var(--text-muted);cursor:pointer;transition:all .2s;font-family:inherit;position:relative}.admin-tab+.admin-tab{border-left:1px solid var(--border)}.admin-tab:hover{background:#f0f5ff;color:var(--primary)}.admin-tab.active{background:#fff;color:var(--primary);font-weight:600;box-shadow:inset 0 -2px 0 var(--primary)}.admin-section{background:#fff;border:1px solid var(--border);border-radius:10px;overflow:hidden}.admin-search-bar{display:flex;gap:10px;padding:16px 20px;border-bottom:1px solid #f0f2f5;background:#fafbfc}.admin-search-input{flex:1;padding:9px 14px;border:1px solid #e0e3e7;border-radius:8px;font-size:14px;font-family:inherit;outline:none;transition:border-color .2s,box-shadow .2s}.admin-search-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #1a73e814}.admin-toolbar{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid #f0f2f5;background:#fafbfc}.admin-hint{font-size:13px;color:var(--text-muted)}.admin-stats{padding:8px 20px;font-size:13px}.admin-loading{text-align:center;padding:40px 20px;color:var(--text-muted);font-size:14px}.admin-stream-hint{padding:6px 20px;font-size:12px;color:#8a8d91;background:#fffbeb;border-bottom:1px solid #fef3c7}.admin-user-table-wrap{overflow-x:auto}.admin-user-table{width:100%;border-collapse:collapse;font-size:14px}.admin-user-table thead{background:#f8f9fb}.admin-user-table th{padding:10px 14px;text-align:left;font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.3px;border-bottom:2px solid #e8ecf1;white-space:nowrap}.admin-user-table td{padding:12px 14px;border-bottom:1px solid #f0f2f5;color:var(--text);vertical-align:middle}.admin-user-table tbody tr:hover{background:#fafbfd}.admin-user-table tbody tr:last-child td{border-bottom:none}.admin-row-disabled{opacity:.5}.admin-user-name{display:flex;align-items:center;gap:10px;font-weight:500}.admin-user-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:600;flex-shrink:0}.admin-email{color:var(--text-muted);font-size:13px;max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.admin-select{padding:5px 8px;border:1px solid #e0e3e7;border-radius:6px;font-size:13px;font-family:inherit;background:#fff;cursor:pointer;outline:none;transition:border-color .2s}.admin-select:focus{border-color:var(--primary)}.admin-actions{display:flex;gap:6px;flex-wrap:wrap}.admin-cat-group{margin-bottom:0}.admin-cat-group-title{padding:12px 20px 8px;font-size:13px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.4px;margin:0;border-bottom:1px solid #f0f2f5;background:#fafbfc}.admin-cat-list{padding:0}.admin-cat-item{display:flex;align-items:center;gap:12px;padding:12px 20px;border-bottom:1px solid #f0f2f5;transition:background .15s}.admin-cat-item:last-child{border-bottom:none}.admin-cat-item:hover{background:#fafbfd}.admin-cat-color{width:10px;height:10px;border-radius:50%;flex-shrink:0}.admin-cat-info{flex:1;min-width:0}.admin-cat-name{font-size:14px;font-weight:600;color:var(--text);margin-bottom:4px}.admin-cat-meta{display:flex;gap:12px;font-size:12px;color:var(--text-muted);flex-wrap:wrap}.admin-cat-meta span{white-space:nowrap}.admin-cat-desc{overflow:hidden;text-overflow:ellipsis;max-width:200px}.admin-cat-actions{display:flex;gap:6px;flex-shrink:0}.admin-form{display:flex;flex-direction:column;gap:14px}.admin-field label{display:block;font-size:13px;font-weight:500;color:var(--text);margin-bottom:6px}.admin-field input,.admin-field select,.admin-field textarea{width:100%;padding:9px 12px;border:1px solid #e0e3e7;border-radius:8px;font-size:14px;font-family:inherit;outline:none;transition:border-color .2s;box-sizing:border-box}.admin-field input:focus,.admin-field select:focus,.admin-field textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #1a73e814}.admin-color-row{display:flex;gap:8px;align-items:center}.admin-color-picker{width:36px!important;height:36px;padding:2px!important;border-radius:6px;cursor:pointer;flex-shrink:0}.admin-load-more{text-align:center;padding:14px;color:var(--text-muted);font-size:13px}.btn-sm{padding:4px 10px!important;font-size:12px!important;border-radius:6px!important}.btn-danger-admin{background:#fef2f2!important;border:1px solid #fecaca!important;color:#dc2626!important}.btn-danger-admin:hover{background:#fee2e2!important;border-color:#fca5a5!important}.search-page{max-width:720px;margin:0 auto;padding:40px 16px}.search-page-hero{text-align:center;margin-bottom:32px}.search-page-icon{display:inline-flex;align-items:center;justify-content:center;width:64px;height:64px;border-radius:16px;background:linear-gradient(135deg,#e8f0fe,#d2e3fc);margin-bottom:16px;color:var(--primary)}.search-page-hero h1{font-size:28px;font-weight:700;margin:0 0 8px;color:var(--text)}.search-page-subtitle{font-size:14px;color:var(--text-muted);margin:0}.search-page-form{display:flex;gap:12px;margin-bottom:40px}.search-page-input-wrap{flex:1;position:relative}.search-page-input-icon{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--text-muted);display:flex;align-items:center;pointer-events:none}.search-page-input{width:100%;padding:14px 48px;border:2px solid #e0e3e7;border-radius:12px;font-size:16px;font-family:inherit;outline:none;transition:border-color .2s,box-shadow .2s;box-sizing:border-box}.search-page-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #1a73e81a}.search-page-btn{padding:0 28px;border:none;border-radius:12px;background:var(--primary);color:#fff;font-size:15px;font-weight:500;cursor:pointer;transition:background .2s;font-family:inherit;white-space:nowrap}.search-page-btn:hover{background:var(--primary-hover)}.search-page-btn:disabled{opacity:.6;cursor:not-allowed}.search-page-hot{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px 24px}.search-page-hot-title{font-size:14px;font-weight:600;color:var(--text);margin:0 0 16px;display:flex;align-items:center;gap:6px}.search-page-hot-loading{display:flex;flex-direction:column;gap:10px}.search-page-hot-skeleton{height:22px;border-radius:11px;background:linear-gradient(90deg,#f0f2f5 25%,#e8ecf1,#f0f2f5 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;width:60%}.search-page-hot-skeleton:nth-child(2){width:45%}.search-page-hot-skeleton:nth-child(3){width:55%}.search-page-hot-skeleton:nth-child(4){width:35%}.search-page-hot-skeleton:nth-child(5){width:50%}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.search-page-hot-list{display:flex;flex-wrap:wrap;gap:10px}.search-page-hot-item{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border:1px solid #e0e3e7;border-radius:20px;background:#fafbfc;cursor:pointer;transition:all .2s;font-size:14px;font-family:inherit;color:var(--text)}.search-page-hot-item:hover{border-color:var(--primary);background:#f0f5ff;color:var(--primary);transform:translateY(-1px);box-shadow:0 2px 8px #1a73e81a}.search-page-hot-rank{font-size:12px;font-weight:700;color:var(--text-muted)}.search-page-hot-text{color:inherit}.search-page-hot-count{font-size:11px;color:var(--text-muted);background:#f0f2f5;padding:2px 8px;border-radius:10px}.search-page-hot-item:hover .search-page-hot-count{background:#d2e3fc;color:var(--primary)}.search-page-hot-empty{text-align:center;font-size:13px;color:var(--text-muted);padding:16px 0}@media (max-width: 600px){.search-page-hero{margin-bottom:24px}.search-page-hero h1{font-size:22px}.search-page-form{flex-direction:column}.search-page-btn{padding:12px 0}.search-page-input{font-size:15px}}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:#00000059;display:flex;align-items:center;justify-content:center;animation:modal-fade-in .2s ease;padding:20px}@keyframes modal-fade-in{0%{opacity:0}to{opacity:1}}.modal-card{background:#fff;border-radius:13px;width:100%;max-width:300px;box-shadow:0 12px 40px #00000026;animation:modal-scale-in .25s ease;overflow:hidden}@keyframes modal-scale-in{0%{transform:scale(.85);opacity:0}to{transform:scale(1);opacity:1}}.modal-title{font-size:17px;font-weight:600;text-align:center;padding:20px 20px 0;color:#1d1d1f}.modal-body{font-size:14px;line-height:1.5;color:#3c3c43;text-align:center;padding:20px}.modal-actions{display:flex;border-top:.5px solid #c6c6c8}.modal-btn{flex:1;height:44px;border:none;background:none;font-size:17px;cursor:pointer;font-family:inherit;transition:background .2s,color .2s;color:#007aff;font-weight:500;padding:0}.modal-btn:active{background:#e5e5ea}.modal-btn-cancel{border-right:.5px solid #c6c6c8;color:#6e6e73;font-weight:400;background:linear-gradient(180deg,#8e8e9314,#8e8e9305);box-shadow:inset 0 1px #fff6}.modal-btn-cancel:active{background:linear-gradient(180deg,#8e8e9324,#8e8e930d)}.modal-btn-confirm{color:#007aff;font-weight:600;background:linear-gradient(180deg,#007aff14,#007aff05);box-shadow:inset 0 1px #fff6}.modal-btn-confirm:active{background:linear-gradient(180deg,#007aff24,#007aff0d)}.modal-btn-danger{color:#ff3b30;background:linear-gradient(180deg,#ff3b3014,#ff3b3005);box-shadow:inset 0 1px #fff6}.modal-btn-danger:active{background:linear-gradient(180deg,#ff3b3024,#ff3b300d)}.back-to-top{position:fixed;bottom:32px;right:32px;width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:#fff;color:#555;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:150;box-shadow:0 2px 12px #0000001f;transition:transform .2s,box-shadow .2s,opacity .3s;animation:backToTopIn .3s ease}.back-to-top:hover{transform:translateY(-2px);box-shadow:0 4px 16px #0000002e;color:var(--primary)}.back-to-top:active{transform:translateY(0)}@keyframes backToTopIn{0%{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}.search-highlight{background:#fef08a;color:#1a1a2e;padding:1px 2px;border-radius:2px;font-weight:500}.search-highlight-current{background:#fb923c;color:#fff;padding:1px 2px;border-radius:2px;font-weight:600;box-shadow:0 0 0 2px #fb923c4d}.search-nav-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;margin-bottom:12px;background:#fefce8;border:1px solid #fde68a;border-radius:8px;font-size:13px;color:#92400e;position:sticky;top:calc(var(--header-height) + 10px);z-index:50}.search-nav-info strong{color:#713f12}.search-nav-btns{display:flex;align-items:center;gap:8px}.search-nav-btn{display:inline-flex;align-items:center;gap:3px;padding:4px 10px;border:1px solid #d4d4d8;border-radius:6px;background:#fff;font-size:12px;color:#3f3f46;cursor:pointer;font-family:inherit;transition:all .15s}.search-nav-btn:hover{background:#f4f4f5;border-color:#a1a1aa}.search-nav-pos{font-size:12px;color:#71717a;min-width:40px;text-align:center}.topic-card-links-search{margin-top:6px;padding:8px 10px;background:#f8fafc;border:1px solid #e2e8f0;border-radius:6px}.topic-card-link-hit{display:flex;align-items:center;gap:6px;padding:3px 0;font-size:12px;overflow:hidden}.topic-card-link-hit+.topic-card-link-hit{border-top:1px solid #f1f5f9;padding-top:5px;margin-top:2px}.topic-card-link-hit-title{color:#6366f1;font-weight:500;white-space:nowrap;flex-shrink:0}.topic-card-link-hit-url{color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}.topic-card-link-hit-url .search-highlight{background:#fef08a}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--primary: #1a73e8;--primary-hover: #1557b0;--header-bg: #ffffff;--bg: #f5f6f8;--card-bg: #ffffff;--border: #e0e3e7;--text: #1c1e21;--text-secondary: #65676b;--text-muted: #8a8d91;--link: #1a73e8;--tag-bg: #e8f0fe;--tag-text: #1a73e8;--success: #36b37e;--danger: #e74c3c;--header-height: 60px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;cursor:default}a,button,select,input[type=submit],input[type=button],input[type=reset],[role=button],.clickable,label[for],a:hover{cursor:pointer}input[type=text],input[type=email],input[type=password],input[type=search],input[type=number],textarea{cursor:text}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%}