@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,d09GMgABAAAAAA4oAA4AAAAAHbQAAA3TAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAABmAAgRQIDgmcDBEICo1oijYBNgIkA14LMgAEIAWJAAeBHAyBHBvbGiMRdnO0IkRRkiYDgr9KsJ1NUAf2kILNxgUmgqIgq1P89vcbIcmsQbRps3vCcXdYOKSWEPEKgZgQkprQQsxIXUgq0DqpGKmIvrgkeVGtEQD9DzAO29fM9jYhxZEsL2FeURH2JN4MIcTdO049NCVdxQ/w9NrSYFEBKTDKpLKfNkCGDc1RwjZLQcm3vqJ2UW9Xfa3tgAHz6ivp6vgC2yD4/6352ndnN0X0TL7seypkjZlMsjmZnf0Mm5Q+JykRWQBKCVCVPbARPXWyQtb5VgLB6Biq7/Uixcj2WGqdI8tGSgkuRG+t910GKP2D7AQH0DB9FMDW/obJZ8giFI3Wg8Cvevz0M+5m0rTh7XDBlvo9Y4vm13EXmfttwI4mBo1EG15fxJhUiCLbiiyCf/ZA6MFAhg3pGIZGdGIVjtPn6UcMk9A/UUr9PhoNsCENw1APAq0gpH73e+M+0ueyHbabc3vkbcdtzcf/fiy+NxQEjf9ud/ELBHAXJ0nk4z+MXH2Ev/kWyV4k7SkvpPc9Qr38F6RPWnM9cN6DJ0AdD1BhtgABtmoRoFCvPsBAumNm6soZG2Gk5GyVTo2sJncSyp0jQTYoR6WDvTwaaEcHsxHfvuWhHA3a6bN7twRKtcGok6NsCi7jYRrM2jExsUFMxMQYuJbMhuWNOumEJy9hi29Dmg5zMp/A5+hhPG19j1vBrq8JTLr8ki5VLPmG/PynJHVul440bxg5xuymHUFPBshC+nA9I1FmwbRBTNHAcik3Oae0cxKoI3MOriM42UrPe51nsaGxJ+WfXubAsP84aabUlQSJ1IiE0iPETLUU4CATgfXSCSpuRFRmCGbO+wSpAnzaeaCYW1VNEysRtuXCEL1kUFUbbtMv3Tilt/1c11jt3Q5bbMa84cpWipp8Elw3MZhOHsOlwwVUQM3lAR35JiFQbaYCRnMF2lxAWoOg2gyoIV4PouX8HytNIfLhqpJtXB4vjiViUI8IJ7bkC4ikkQvKksnOTKICwnqWSZ9YS5f0WCxmpgjbIq7EJcM4aI2nmhLNY2JIUgOjXZFWBHb+x5oh6cwb0Tv1ackHdKi0I9OO2wE9aogIOn540CCCziyhN+IaejtgAONKznHlHyutPrHGwCx9S6B8kfS4Mfi4Eyv7OU730bT1SCBjt834cXsf43zVjPUqqJjgrjeGnBxSG4aYAKFuVbeCfkDIjAqMb6yLNIbCuvXhMH2/+k2vkNpkORhR59N1CkzoOENvneIosjYmuTxlhUzaGEJQ/iWqx4dmwpmKjrwTiTGTCVozNAYqk/zXOndWxuWSmJkQpJw3pK5KX6QrLt5LATMqpmPAQhkhK6PUjzHUn7E0gHE0kPE0iKkolgkUx9SZmVAdDgpffdyJKg3k7VmzYGCwVXGz/tXmkOIp+vcWs+EMuhhvN0h9uhfzWJziBQmCREGSIFmQIkgVpAnSBRmC//6hkLZwaVhwxlrJSOdqlFtOYxlau9F2QN5Y98xmIAsiM1HVp2VFX+DHHGg6Ecjh3vmqtidX3qHI2qycTk/iwxSt5UzTmEP92ZBnEWTk4Mx8Mpl78ZDokxg/KWb+Q0QkvdKVmq3TMW+RXEgrsziSAfNXFMhDc60N5N9jQzjfO0kBKpUZl0ZmwJ41j/B9Hz6wmRaJB84niNmQrzp9eSlQCDDzazGDdVi3P36VZQ+Jy4f9UBNp+3zTjqI4abaFAm+GShVaXlsGdF3FYzZcDI6cori4kMxUECl9IjJZpzkvitAoxKue+90pDMvcKRxLl53TmOKCmV/xRolNKSqqUxc6LStOETmFOiLZZptlZepcKiAzteG8PEdpnQpbOMNcMsR4RR2Bs0cKFEvSmIjAFcnarqwUL4lDhHmnVkwu1IwshbiCcgvOheZuYyOteufZZwlcTlLgnZ3o/WcYdzZHW/WGaqaVfmTZ1aWCceJjkbZqsfbkOtcFlUZM/jy+hXHDbaUobWqqXaeWobbLO99yG5N3U4wxco0rQGGcOLASFMXeJoham8M+/x6O2WywK2l4HGbq1CoUyC/IZikQhdq3SiuNrvAEj0AVu9x2x3lp/xWzahaxidezFVtdcb5uEnzyl0ZmYiuKI0exvCd4Xc9CV1KB0db00z92wDPde0kukbvZIWN6jUWFTmPIC/Y4UPCm8UfDTFZpZNon1qLFTkBhxzB+FjQRA2Q/YRJT8pQigslMaUpFyAG8TMlXigiqmAZX4xgijKjRlGpLE0GdplRfCaJo0JQaSxNBk6ZmMzcya0FmrcisDdn0Q3HI2sWSppYigmlM1XT/kLQZSNpMJG0WkjYbSZuDpM1F0uYhFc1HxU4m1QJjDK6iL0S5uSj5rgXc3RejEigtcRBtqYPQsiTskmO5vosV+q4VGIKbOkDg0jtRrq+Em1YloaTFar3EGr1EUC8R0kus1Uus00usL97ABr2BjXoDm/QGNhuWtMVBKOwg/i78lT7hBsAvDmwHc/ao3vmUbBmhjeYySZNWvGkfZAgISDSaDo1SVpzGDsAEkF8B+gEapViUoZgUWXcRIGFZNm6gWbAKk0bp0k1MHG9fLYtV4iS2SmLEQFARzRcnf9PUS0LVn05/J9MiRRBU3v2IrvW974v4N00L7ZMk0wXP1409CHo/an8zTRHD3eSJ6m8D4YMkZNl3M79sqeuAsr/m3f+8/yl7A50aiAEJgeBeMWzu7ui9UfUBCe2TIqZIoOd/3/udRBOQidQZUERzb2/VwZN1H/Sju82ew2H2Wfr6qvfVf3hqwDvAIpkQVFy4B9Pe9e4/XvPeceu7h3dvO56iJPf0+A6cqA2ip18ER+iFgggiuOkvj24bby0N9j2UHIkgqIt+sVgfodC4YghLSMjSZbH0VR/6dMDrYJeKHilKTemt6v6kvzvn3/RrdWtr0GoN/xL+Sex/cPYLUpepx9cz/D46UPU5KXgAQa+NDps1v6J3xP1i2HtaDB0M9aX2deA7SYff//+gUCovMmIK/qfsFcOk+4Y5ZN97XlG6zebqtMbKgeRFi51vnxTQYBUik2rS/Cn6PC8ADR8FGxsRPB82dzfND90gIcshOcYUkfjherBz53odpm6TP8txlwOZ71xmfHHOvq053qFF/MRlS3jP0ELudrf2OeN8DHvp6ZceLe8qKYvWz/7yp0u4dKPfli3CYq0O13Ih71mylJ80tOi10On8wi+F4+LWgDPeJ30msSQt9/vkmHq9/Lvo2b461mP801v3W4xTcs6CbvF9UDdrSt+A8OUbpSh55qAUFXWznBBfdeJ8a4d7ugT5tvxUza3h9m4H7ptTqiG4z0g5dc0X29OcGlhpGFMpQo9ytTS+NViZpNdvU4kWx+LKxNY10kQ1yqGXrhe4/1nvP7E+nd5A92TtaRplbHSqoIdOqtRWti+fkB5/n1+/VvCmz12pG1kpQWsfi1ftlBobm0bpngs16CHkbIwdLnParxtTV3QYRlfJ0KFskH7pdN/YDn+yRuSd7sNH3aO0DYPggk6uWuXrfOc+fa3VTxFVvKaNxHsiHmsXyCLIE5yuOeN3/Jdf8HBL/5M6shjyhxHx9BjB1O0+4NLOnjLLSxwO7ukN4jMbOIcD879KLSi6Pk61Oqm2377n8079PXEEQ7cy7OKEC9nbpet118fxweTafpt69x/Bt8UqGzNQt7aelpc44dn5cqhwf71+qKp/Zf/+a0zcizOUWpl/iBcSXip0pplkatCchoH5c5aUM8I7/dWxAej8WicPL1URFZ9BDJelUwEwTkGqUhgSlydVes95YdXvhh9Gfz/aeFWvgVb4tuLbcv4+wLdutVZv/cUonwBD/6eDlE0aSiKK/uoH3+J1wDE/jMVqY2ysGufN84oIXB0sPzy8ollX/LegY74DgJXJR57sn+VGza0x3DnuIgABFM15LmajjjsNlYj+JEZGbuRYcAMOWxFkPN2w6Wd46xo4gVWQR/X4lyI/R6K/YK0110GzudPRW7Y+UOBGTfNNzHeYT0fiH0taunBpq9HEW8OKSaBGj21L0MqenEmNRWBAWDWAk4CpNoEZJ2tTaPFgbQYj8HxtFilErs3BTRwT8uO1NXQaWfIotchmPkAF5mMBAliEmZiOGVgCG9LgRzpscMAOOwowlT3JhusdazXGSC/hxR3UlmWVwWHpOIKheqONvjyhSiTHIkVUco5bnji8m//zL7PKaT1Vl5I6UE609f+gkr6MZKVyKc7zJRmCahLsdlyA5fdQkRSan9LgnnLEyGSkaKJCJog0wAgvepWBt80+1yKln1bMVtCljfNWDueKLsWwaEbBSfSPTEmVRsUcYYMnEjcjeyCZzBXK9E9BYBXLKjOSpUDR+nEV3TFSUdQaz+ot98QxgXwx0GQ+EEUAKB2qZPkQQ0GqFD8UPFMqyaCHM24BZmSGic9EYMagKizOw9Hz50DMrDLrqqLkTAhplMictiCAx5S3BIUQdeJeLnBy2CNtMfz6cV4u8XKoFZQesbf9YZiIERiHjaNodDW6LgcirX/mPnJIkBGDUpTBhSa0EIr38D5hCIszhCM8URGBqImoWjpvpt1ebu/v3Gl3qJfMnNM+9V+kiRFyROTPHQWOcs1dNW94/ukKMPZBvDi55i5CttdeJz84DLngLqjcdwEZ87bFFR8CIG35OAkDVN6VRDZ7aq67NteYqZ2lpT8oYB2CytoBd6VuAx4WgiAsnuj3WohG+LugzXiQRDeM3XYXlULv4dp5VFYC) 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,math,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:"0.19.1"}.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 .reflectbox{display:inline-block;transform:scaleX(-1)}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.katex-tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.katex-tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}@font-face{font-family:Anek Bangla;src:url(/fonts/anek-bangla.woff2) format("woff2");font-weight:100 800;font-display:swap;unicode-range:U+0951-0952,U+0964-0965,U+0980-09FE,U+200C-200D,U+20B9,U+25CC}@font-face{font-family:Anek Bangla;src:url(/fonts/anek-bangla-latin.woff2) format("woff2");font-weight:100 800;font-display:swap;unicode-range:U+0000-00FF,U+2000-206F,U+2212}@font-face{font-family:Hind Siliguri;src:url(/fonts/hind-siliguri-400.woff2) format("woff2");font-weight:400;font-display:swap;unicode-range:U+0951-0952,U+0964-0965,U+0980-09FE,U+200C-200D,U+20B9,U+25CC}@font-face{font-family:Hind Siliguri;src:url(/fonts/hind-siliguri-500.woff2) format("woff2");font-weight:500;font-display:swap;unicode-range:U+0951-0952,U+0964-0965,U+0980-09FE,U+200C-200D,U+20B9,U+25CC}@font-face{font-family:Hind Siliguri;src:url(/fonts/hind-siliguri-600.woff2) format("woff2");font-weight:600 700;font-display:swap;unicode-range:U+0951-0952,U+0964-0965,U+0980-09FE,U+200C-200D,U+20B9,U+25CC}@font-face{font-family:Figtree;src:url(/fonts/figtree.woff2) format("woff2");font-weight:300 900;font-display:swap;unicode-range:U+0000-00FF,U+2000-206F,U+2212,U+2022,U+2026}:root{--paper: #FAF4E6;--paper-2: #F3EAD3;--card: #FFFDF7;--ink: #1F2B3A;--ink-2: #566173;--ink-3: #8B93A0;--line: #E6DBC2;--line-2: #D5C7A7;--rule: rgba(46, 98, 160, .1);--margin: rgba(226, 104, 98, .55);--accent: #0E7A69;--accent-2: #0A5F52;--accent-ink: #FFFFFF;--accent-soft: #DDEFE8;--sun: #F7B733;--sun-2: #D99A16;--sun-ink: #3A2A0A;--sun-soft: #FCEBC0;--ok: #17855C;--ok-soft: #DCF1E6;--bad: #C8463D;--bad-soft: #FADFDB;--shadow: rgba(60, 45, 10, .14);--veil: rgba(31, 43, 58, .42);--head: "Anek Bangla", "Figtree", system-ui, sans-serif;--body: "Figtree", "Hind Siliguri", system-ui, -apple-system, "Segoe UI", sans-serif;--r: 18px;--side: 296px;color-scheme:light}[data-theme=dark]{--paper: #0F1F1B;--card: #172F29;--ink: #F3EEDF;--ink-2: #B1C0B7;--ink-3: #7F9289;--paper-2: #132823;--line: #264239;--line-2: #33574B;--rule: rgba(255, 255, 255, .045);--margin: rgba(240, 138, 123, .35);--accent: #F6C95C;--accent-2: #D9AC3F;--accent-ink: #22200F;--accent-soft: #2E3A24;--sun: #F7B733;--sun-2: #C98F12;--sun-ink: #2A1E05;--sun-soft: #3A3219;--ok: #5DCB98;--ok-soft: #173A2C;--bad: #F08A7B;--bad-soft: #43231F;--shadow: rgba(0, 0, 0, .38);--veil: rgba(4, 12, 10, .62);color-scheme:dark}.g-physics{--g: #C9820A;--g-soft: #FCEBC0}.g-chemistry{--g: #7A56C2;--g-soft: #EBE3FA}.g-math{--g: #0E7A69;--g-soft: #DDEFE8}.g-biology{--g: #3F8F2E;--g-soft: #E2F1D9}.g-english{--g: #CF4F45;--g-soft: #FBE1DD}.g-bangla{--g: #B8376F;--g-soft: #F8DFEA}.g-ict{--g: #2B6FC2;--g-soft: #DDE9F9}[data-theme=dark] .g-physics{--g: #F7B733;--g-soft: #3A3219}[data-theme=dark] .g-chemistry{--g: #B79CF0;--g-soft: #2C2845}[data-theme=dark] .g-math{--g: #5FD0B5;--g-soft: #173A32}[data-theme=dark] .g-biology{--g: #8FD67C;--g-soft: #213A1C}[data-theme=dark] .g-english{--g: #F59A8E;--g-soft: #43231F}[data-theme=dark] .g-bangla{--g: #F08DB6;--g-soft: #432033}[data-theme=dark] .g-ict{--g: #8DB8F5;--g-soft: #1C2F4A}*,*:before,*:after{box-sizing:border-box}html,body{height:100%;margin:0}html{background:var(--paper);-webkit-text-size-adjust:100%}body{font:400 16.5px/1.7 var(--body);color:var(--ink);background:var(--paper);overflow:hidden;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}h1,h2,h3{font-family:var(--head);line-height:1.25;margin:0;letter-spacing:-.005em}p{margin:0}a{color:var(--accent);text-underline-offset:3px}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer;border:0;background:none;padding:0}button:disabled{cursor:default}:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 55%,transparent);outline-offset:2px;border-radius:8px}[hidden]{display:none!important}.grow{flex:1;min-width:0}.ic{width:1.25em;height:1.25em;flex:none}.buddy{display:block;width:100%;height:100%;overflow:visible}small{font-size:.84em;color:var(--ink-2)}code{font-family:ui-monospace,Cascadia Code,Consolas,monospace;font-size:.9em}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:9px 18px;border-radius:14px;font-weight:600;text-decoration:none;color:var(--ink);background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 3px 0 var(--line-2);transition:transform .08s,box-shadow .08s,background .15s;text-align:center;line-height:1.3}.btn:active:not(:disabled){transform:translateY(2px);box-shadow:0 1px 0 var(--line-2)}.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent-2);box-shadow:0 3px 0 var(--accent-2)}.btn.primary:active:not(:disabled){box-shadow:0 1px 0 var(--accent-2)}.btn.danger{background:var(--bad);color:#fff;border-color:color-mix(in srgb,var(--bad) 70%,#000);box-shadow:0 3px color-mix(in srgb,var(--bad) 70%,#000)}[data-theme=dark] .btn.danger{color:#2a0f0b}.btn.small{min-height:38px;padding:6px 14px;font-size:.92em;border-radius:12px}.btn.wide{width:100%}.btn:disabled{opacity:.5;box-shadow:none;transform:none}.btn .tail{display:inline-flex;margin-left:2px}.round{width:44px;height:44px;border-radius:50%;display:inline-grid;place-items:center;flex:none;color:var(--ink);transition:background .15s}.round:hover{background:color-mix(in srgb,var(--ink) 8%,transparent)}.pill{height:36px;padding:0 14px;border-radius:999px;border:1.5px solid var(--line-2);font-weight:600;font-size:.86em;background:var(--card);flex:none}.mini{width:34px;height:34px;border-radius:10px;display:inline-grid;place-items:center;color:var(--ink-3);flex:none}.mini:hover{color:var(--bad);background:var(--bad-soft)}.mini.text{width:auto;padding:0 10px;font-size:.85em;font-weight:600;color:var(--accent)}.mini.text:hover{background:var(--accent-soft);color:var(--accent)}.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.row.center{justify-content:center}.fine{font-size:.86em;color:var(--ink-2);line-height:1.55}.fine.lock{display:flex;gap:8px;align-items:flex-start}.fine.lock .ic{margin-top:2px;color:var(--ok)}.spin{width:18px;height:18px;border-radius:50%;border:2.5px solid color-mix(in srgb,currentColor 30%,transparent);border-top-color:currentColor;animation:spin .8s linear infinite;display:inline-block;vertical-align:-3px}@keyframes spin{to{transform:rotate(360deg)}}.glyph{width:38px;height:38px;border-radius:12px;display:inline-grid;place-items:center;flex:none;background:var(--g-soft);color:var(--g)}.glyph svg{width:26px;height:26px}.glyph.big{width:56px;height:56px;border-radius:16px}.glyph.big svg{width:38px;height:38px}.app{height:100dvh;display:flex}.main{flex:1;min-width:0;display:flex;flex-direction:column;height:100dvh}.top{display:flex;align-items:center;gap:6px;padding:8px 10px;padding-top:max(8px,env(safe-area-inset-top));min-height:60px;flex:none;border-bottom:1.5px solid var(--line);background:color-mix(in srgb,var(--paper) 92%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:5}.top-title{font-family:var(--head);font-size:1.15em;padding-left:4px}.wordmark{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font:700 1.22em var(--head);padding-left:2px;white-space:nowrap;min-width:0}.wordmark .buddy{width:32px;height:32px}.view{flex:1;overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;scroll-padding-bottom:200px}.offline{display:flex;gap:8px;align-items:center;justify-content:center;padding:6px 12px;font-size:.86em;background:var(--sun-soft);color:var(--ink);flex:none}.side{position:fixed;inset:0 auto 0 0;width:min(86vw,var(--side));z-index:30;background:var(--paper-2);border-right:1.5px solid var(--line);display:flex;flex-direction:column;gap:12px;padding:14px 12px;padding-top:max(14px,env(safe-area-inset-top));transform:translate(-102%);transition:transform .24s cubic-bezier(.2,.8,.2,1)}.scrim{position:fixed;top:0;right:0;bottom:0;left:0;z-index:25;background:var(--veil);opacity:0;pointer-events:none;transition:opacity .2s}.side-open .side{transform:none;box-shadow:12px 0 40px var(--shadow)}.side-open .scrim{opacity:1;pointer-events:auto}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font:700 1.36em var(--head);padding:4px 6px}.brand .buddy{width:40px;height:40px}.side-nav{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px;margin:0 -4px;padding:0 4px}.side-h{font:600 .78em var(--body);letter-spacing:.02em;color:var(--ink-3);padding:12px 8px 4px}.side-item{display:flex;align-items:center;gap:10px;padding:6px 8px;border-radius:12px;text-decoration:none;color:var(--ink);min-height:46px;line-height:1.35;font-size:.95em}.side-item a{color:inherit;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:6px 0}.side-item .glyph{width:32px;height:32px;border-radius:10px}.side-item .glyph svg{width:22px;height:22px}.side-item:hover,.side-item.on{background:color-mix(in srgb,var(--ink) 7%,transparent)}.side-item.on{font-weight:600}.side-item .mini{opacity:.55}.side-item:hover .mini{opacity:1}.side-empty{padding:4px 8px;color:var(--ink-3);font-size:.9em}.side-foot{display:flex;flex-direction:column;gap:4px;border-top:1.5px solid var(--line);padding-top:10px}.side-brain{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:14px;text-decoration:none;color:var(--ink);background:var(--card);border:1.5px solid var(--line-2);margin-bottom:6px;line-height:1.3}.side-brain b,.side-brain small{display:block}.side-brain small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.led{width:10px;height:10px;border-radius:50%;background:var(--ink-3);flex:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--ink-3) 22%,transparent)}.on>.led{background:var(--ok);box-shadow:0 0 0 3px color-mix(in srgb,var(--ok) 25%,transparent)}.side-link{display:flex;align-items:center;gap:10px;padding:7px 10px;border-radius:10px;text-decoration:none;color:var(--ink-2);font-size:.92em;text-align:left;width:100%}.side-link:hover{background:color-mix(in srgb,var(--ink) 7%,transparent);color:var(--ink)}.side-link.danger:hover{color:var(--bad);background:var(--bad-soft)}.credit{font-size:.8em;color:var(--ink-3);line-height:1.5;padding:10px 10px 4px}.credit a{color:var(--ink-2);font-weight:600}.credit .dot{margin:0 2px}.page>.credit,.view>.credit{text-align:center;padding:26px 16px calc(22px + env(safe-area-inset-bottom))}.side .credit a[data-link],.side .credit .dot{display:none}@media(min-width:960px){.app:not(.no-side) .side{position:static;transform:none;width:var(--side);flex:none;box-shadow:none}.scrim,.menu-btn{display:none!important}.app:not(.no-side) .wordmark{visibility:hidden}.top{padding-inline:20px}}.page{max-width:780px;margin:0 auto;padding:18px 16px 8px;display:flex;flex-direction:column;gap:22px}.block{display:flex;flex-direction:column;gap:12px}.block-h h2{font-size:1.3em}.block-h p{color:var(--ink-2);font-size:.95em}.hero{position:relative;border-radius:26px;padding:26px 22px 22px 44px;background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 4px 0 var(--line-2);overflow:hidden;background-image:repeating-linear-gradient(to bottom,transparent 0 33px,var(--rule) 33px 34.5px);background-position:0 14px}.hero:before{content:"";position:absolute;inset:0 auto 0 28px;width:2px;background:var(--margin)}.hero-text{position:relative;max-width:calc(100% - 92px)}.hero h1{font-size:clamp(2rem,8.6vw,2.9rem);font-weight:750;line-height:1.16}.hero p{color:var(--ink-2);margin-top:8px;line-height:1.6}.hero .soon{display:inline-block;margin-top:16px;padding:4px 12px;border-radius:99px;background:var(--sun-soft);color:var(--ink);font-size:.9em}.hero-buddy{position:absolute;right:14px;top:14px;width:92px;height:92px;transform:rotate(9deg);animation:bob 3.6s ease-in-out infinite;transform-origin:50% 90%}@keyframes bob{0%,to{transform:rotate(9deg) translateY(0)}50%{transform:rotate(4deg) translateY(-5px)}}.ask{position:relative;display:flex;align-items:center;gap:10px;margin-top:22px;padding:7px 7px 7px 20px;border-radius:999px;background:var(--paper);border:1.5px solid var(--line-2);text-decoration:none;color:var(--ink-3);font-size:1.04em;min-height:58px;box-shadow:inset 0 2px color-mix(in srgb,var(--ink) 4%,transparent)}.ask span{flex:1}.ask i{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:var(--accent-ink);box-shadow:0 3px 0 var(--accent-2);font-style:normal}.demos{display:grid;gap:12px}.demo-card{display:flex;align-items:center;gap:14px;padding:14px;border-radius:20px;background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 3px 0 var(--line-2);text-decoration:none;color:var(--ink);transition:transform .12s,box-shadow .12s,border-color .15s;position:relative;overflow:hidden}.demo-card:after{content:"";position:absolute;inset:0 auto 0 0;width:5px;background:var(--g)}.demo-card:hover{border-color:var(--g);transform:translateY(-1px);box-shadow:0 4px 0 var(--line-2)}.demo-card:active{transform:translateY(2px);box-shadow:0 1px 0 var(--line-2)}.demo-text{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.demo-text b{font:650 1.12em/1.3 var(--head)}.demo-text small{line-height:1.45}.demo-card .go{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:var(--g-soft);color:var(--g);flex:none}.subjects{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}@media(min-width:720px){.home .subjects{grid-template-columns:repeat(7,1fr)}}.subject{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 6px 10px;border-radius:16px;background:var(--card);border:1.5px solid var(--line-2);font-weight:600;font-size:.82em;transition:border-color .15s,background .15s,transform .08s;line-height:1.3;min-width:0}.subject:hover{border-color:var(--g)}.subject:active{transform:scale(.97)}.subject.on{border-color:var(--g);background:var(--g-soft);box-shadow:0 0 0 1.5px var(--g)}.subject.on .glyph{background:var(--card)}.brain-card{display:flex;align-items:center;gap:12px;padding:14px;border-radius:20px;text-decoration:none;color:var(--ink);background:var(--sun-soft);border:1.5px dashed var(--sun-2);line-height:1.35;flex-wrap:wrap}.brain-card.on{background:var(--ok-soft);border:1.5px solid color-mix(in srgb,var(--ok) 50%,transparent)}.brain-card b,.brain-card small{display:block}.brain-card small{overflow-wrap:anywhere}.brain-ic{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--card);color:var(--sun-2);flex:none}.brain-card.on .brain-ic{color:var(--ok)}.recent{display:grid;gap:8px}.recent-item{display:flex;align-items:center;gap:12px;padding:8px 12px 8px 8px;border-radius:14px;background:var(--card);border:1.5px solid var(--line);text-decoration:none;color:var(--ink)}.recent-item .grow{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.recent-item>.ic{color:var(--ink-3)}@media(min-width:720px){.page{padding:28px 24px 8px}.hero{padding:38px 34px 30px 64px}.hero:before{left:40px}.hero-buddy{width:128px;height:128px;right:30px;top:22px}.hero-text{max-width:calc(100% - 150px)}.demos{grid-template-columns:repeat(3,1fr)}.demo-card{flex-direction:column;align-items:flex-start;padding:18px 16px 16px 20px}.demo-card .go{position:absolute;right:14px;top:16px}}.chat{min-height:100%;display:flex;flex-direction:column;max-width:820px;margin:0 auto}.msgs{flex:1;padding:18px 14px 8px;display:flex;flex-direction:column;gap:16px}.context{display:flex;align-items:center;gap:10px;padding:4px 10px 4px 4px;border-radius:14px;text-align:left;min-width:0;line-height:1.25}button.context:not(:disabled):hover{background:color-mix(in srgb,var(--ink) 7%,transparent)}.context-text{min-width:0;display:flex;flex-direction:column}.context-text b{font:650 1.04em var(--head);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.context-text small{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.context>.ic{color:var(--ink-3);width:18px}.context.plainchip{padding-left:10px}.brain-chip{display:inline-flex;align-items:center;gap:8px;height:36px;padding:0 12px;border-radius:99px;border:1.5px solid var(--line-2);text-decoration:none;color:var(--ink);font-size:.84em;font-weight:600;background:var(--card);flex:none;max-width:34vw}.brain-chip span:last-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.toggles{display:inline-flex;align-items:center;gap:6px;flex:none}.side-toggles{display:flex;align-items:center;gap:6px;padding:0 4px 6px}@media(max-width:640px){[data-view=chat] .top .toggles,[data-view=demo] .top .toggles{display:none}}.msg{display:flex;gap:10px;animation:rise .28s cubic-bezier(.2,.8,.2,1) both;max-width:100%}@keyframes rise{0%{opacity:0;transform:translateY(8px)}}.msg.me{justify-content:flex-end}.msg.me .bubble{background:var(--accent);color:var(--accent-ink);border-radius:20px 20px 6px;padding:10px 16px;max-width:84%;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.6;box-shadow:0 3px 0 var(--accent-2);font-weight:500}.ava{width:34px;height:34px;flex:none;margin-top:2px}.msg.bot .body{min-width:0;flex:1;display:flex;flex-direction:column;gap:10px;align-items:flex-start}.msg.bot .bubble{background:var(--card);border:1.5px solid var(--line-2);border-radius:6px 20px 20px;padding:12px 16px;max-width:100%;min-width:0;box-shadow:0 3px 0 var(--line);overflow-wrap:anywhere}.bubble.thinking{display:inline-flex;align-items:center;gap:10px;padding:14px 16px}.dots{display:inline-flex;gap:5px}.dots i{width:8px;height:8px;border-radius:50%;background:var(--ink-3);animation:dot 1.1s ease-in-out infinite}.dots i:nth-child(2){animation-delay:.15s}.dots i:nth-child(3){animation-delay:.3s}@keyframes dot{0%,60%,to{transform:none;opacity:.45}30%{transform:translateY(-5px);opacity:1}}.bubble.writing>:last-child:after,.bubble.writing>:last-child>li:last-child:after{content:"";display:inline-block;width:9px;height:1.05em;margin-left:3px;vertical-align:-3px;border-radius:3px;background:var(--sun)}.bubble.writing>ul:last-child:after,.bubble.writing>ol:last-child:after,.bubble.writing>.table-wrap:last-child:after,.bubble.writing>.math-block:last-child:after,.bubble.writing>.math-pending:last-child:after{display:none}.math-pending{display:inline-flex;gap:4px;padding:6px 10px;border-radius:10px;background:var(--sun-soft);vertical-align:middle}.math-pending i{width:6px;height:6px;border-radius:50%;background:var(--sun-2);animation:dot 1.1s ease-in-out infinite}.math-pending i:nth-child(2){animation-delay:.15s}.math-pending i:nth-child(3){animation-delay:.3s}.msg.score{justify-content:center}.score-line{display:inline-flex;gap:8px;align-items:center;padding:6px 14px;border-radius:99px;background:var(--sun-soft);font-size:.9em;font-weight:600}.cta{margin-top:2px}.md{line-height:1.75;overflow-wrap:anywhere}.md>*{margin:0 0 .7em}.md>:last-child{margin-bottom:0}.md h1,.md h2,.md h3,.md h4{font:700 1.1em/1.35 var(--head);margin:.9em 0 .4em}.md>:first-child{margin-top:0}.md strong{font-weight:650;color:color-mix(in srgb,var(--ink) 100%,transparent)}.md ul,.md ol{padding-left:1.45em}.md li{margin:.28em 0}.md li::marker{color:var(--accent);font-weight:700}.md blockquote{margin-inline:0;padding:10px 14px;border-left:4px solid var(--accent);background:var(--accent-soft);border-radius:4px 14px 14px 4px;font-weight:500}.md blockquote p{margin:0}.md hr{border:0;border-top:2px dashed var(--line-2);margin:1em 0}.md code{background:color-mix(in srgb,var(--ink) 8%,transparent);padding:1px 6px;border-radius:6px}.md pre{background:color-mix(in srgb,var(--ink) 8%,transparent);padding:12px;border-radius:12px;overflow-x:auto}.md pre code{background:none;padding:0}.table-wrap{overflow-x:auto;border:1.5px solid var(--line-2);border-radius:14px;max-width:100%}.md table{border-collapse:collapse;width:100%;font-size:.93em;line-height:1.5}.md th,.md td{padding:8px 12px;text-align:left;border-bottom:1.5px solid var(--line);vertical-align:top;min-width:124px}.md td:first-child,.md th:first-child{min-width:96px}.md th{background:var(--paper-2);font-weight:650;white-space:nowrap}.md tr:last-child td{border-bottom:0}.math-block{overflow-x:auto;overflow-y:hidden;padding:6px 2px;max-width:100%}.katex{font-size:1.12em}.katex-display{margin:.2em 0}.rawtext{white-space:pre-wrap}.acts{display:flex;flex-wrap:wrap;gap:8px;animation:rise .3s .05s both}.act{display:inline-flex;align-items:center;gap:6px;min-height:38px;padding:5px 13px;border-radius:999px;background:var(--card);border:1.5px solid var(--line-2);font-size:.88em;font-weight:600;color:var(--ink);transition:transform .08s,border-color .15s,background .15s}.act:hover{border-color:var(--accent)}.act:active{transform:scale(.96)}.act .ic{width:17px;height:17px;color:var(--accent)}.act.star{background:var(--sun);border-color:var(--sun-2);color:var(--sun-ink);box-shadow:0 2px 0 var(--sun-2)}.act.star .ic{color:var(--sun-ink)}.act.ghost{padding:5px 9px;border-color:transparent;background:none}.act.ghost .ic{color:var(--ink-3)}.empty{margin:auto;text-align:center;padding:20px 8px;display:flex;flex-direction:column;align-items:center;gap:6px;max-width:480px;animation:rise .35s both}.empty-buddy{width:96px;height:96px;animation:bob2 3.2s ease-in-out infinite}@keyframes bob2{50%{transform:translateY(-6px) rotate(-3deg)}}.empty h2{font-size:1.5em}.empty p{color:var(--ink-2);line-height:1.6}.starters{display:flex;flex-direction:column;gap:8px;width:100%;margin-top:14px}.starter{padding:11px 16px;border-radius:16px;background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 3px 0 var(--line);text-align:left;font-weight:500;line-height:1.45;transition:transform .08s,border-color .15s}.starter:hover{border-color:var(--accent)}.starter:active{transform:translateY(2px)}.dock{position:sticky;bottom:0;padding:10px 12px calc(8px + env(safe-area-inset-bottom));background:linear-gradient(to bottom,transparent,var(--paper) 22px);display:flex;flex-direction:column;gap:8px;z-index:3}.chips{display:flex;gap:8px;overflow-x:auto;padding:4px 2px 6px;margin:0 -12px;padding-inline:12px;scrollbar-width:none;scroll-snap-type:x proximity}.chips::-webkit-scrollbar{display:none}.chip{flex:none;max-width:76vw;padding:9px 15px;border-radius:16px;background:var(--card);border:1.5px solid var(--accent);color:var(--ink);font-weight:550;font-size:.93em;line-height:1.4;text-align:left;box-shadow:0 3px color-mix(in srgb,var(--accent) 45%,var(--line));scroll-snap-align:start;text-decoration:none;transition:transform .08s,opacity .2s;animation:rise .3s both}.chip:nth-child(2){animation-delay:.04s}.chip:nth-child(3){animation-delay:.08s}.chip:nth-child(4){animation-delay:.12s}.chip:nth-child(5){animation-delay:.16s}.chip:nth-child(6){animation-delay:.2s}.chip:active:not(:disabled){transform:translateY(2px)}.chip:disabled{opacity:.45}.chip.strong{background:var(--accent);color:var(--accent-ink)}.chips.done{align-items:center;font-size:.92em;color:var(--ink-2);flex-wrap:wrap;overflow:visible}.composer{display:flex;align-items:flex-end;gap:4px;padding:5px;border-radius:28px;background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 3px 0 var(--line-2);transition:border-color .15s}.composer:focus-within{border-color:var(--accent)}.composer textarea{flex:1;min-width:0;border:0;outline:0;background:none;resize:none;padding:10px 8px 10px 12px;line-height:1.5;max-height:140px;font-size:16.5px}.composer textarea::placeholder{color:var(--ink-3)}.sendbtn{background:var(--accent);color:var(--accent-ink);box-shadow:0 3px 0 var(--accent-2);transition:transform .08s}.sendbtn:hover{background:var(--accent)}.sendbtn:active{transform:translateY(2px)}.sendbtn.stop{background:var(--ink);color:var(--paper);box-shadow:0 3px color-mix(in srgb,var(--ink) 60%,#000)}.mic{color:var(--ink-2)}.mic.on{background:var(--bad);color:#fff;animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 color-mix(in srgb,var(--bad) 45%,transparent)}50%{box-shadow:0 0 0 9px transparent}}.dock-note{text-align:center;font-size:.74em;color:var(--ink-3);line-height:1.4}@media(min-width:720px){.chips{flex-wrap:wrap;overflow:visible;margin:0;padding-inline:2px}.chip{max-width:100%}.msgs{padding:26px 22px 8px}.dock{padding-inline:22px}.msg.me .bubble{max-width:70%}}.msg.err{background:var(--bad-soft);border:1.5px solid color-mix(in srgb,var(--bad) 45%,transparent);border-radius:18px;padding:12px 14px;gap:12px;align-items:flex-start}.msg.err.inline{animation:none}.err-ic{width:36px;height:36px;border-radius:50%;background:var(--card);color:var(--bad);display:grid;place-items:center;flex:none}.err-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:10px;font-size:.95em}.err-body .md{line-height:1.6}.err-body details{font-size:.82em;color:var(--ink-2)}.err-body details code{display:block;margin-top:4px;white-space:pre-wrap;overflow-wrap:anywhere}.err-acts{display:flex;gap:8px;flex-wrap:wrap}.page-head{display:flex;gap:14px;align-items:flex-start}.page-head h1{font-size:clamp(1.55rem,6vw,2.05rem)}.page-head p{color:var(--ink-2);margin-top:6px;line-height:1.6}.page-buddy{width:64px;height:64px;flex:none}.page-buddy.bob{animation:bob2 2.4s ease-in-out infinite}.way{display:flex;gap:12px;padding:16px 14px;border-radius:22px;background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 3px 0 var(--line-2)}.way.best{border-color:var(--accent);box-shadow:0 3px color-mix(in srgb,var(--accent) 50%,var(--line-2))}.way.active{border-color:var(--ok);box-shadow:0 3px color-mix(in srgb,var(--ok) 50%,var(--line-2))}.way-n{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--paper-2);font:700 1.05em var(--head);flex:none;border:1.5px solid var(--line-2)}.way.best .way-n{background:var(--accent);color:var(--accent-ink);border-color:var(--accent-2)}.way-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:10px;align-items:flex-start}.way-body>div,.way-body>p{width:100%}.way-body p{line-height:1.6}.way-h{display:flex;align-items:center;gap:8px;flex-wrap:wrap;min-height:34px}.way-h h2{font-size:1.18em}.tag{display:inline-flex;align-items:center;gap:4px;padding:2px 10px;border-radius:99px;font-size:.76em;font-weight:650;background:var(--paper-2);color:var(--ink-2);line-height:1.6}.tag .ic{width:14px;height:14px}.tag.ok,.tag.on{background:var(--ok-soft);color:var(--ok)}.tag.star{background:var(--sun);color:var(--sun-ink)}.warn{font-size:.9em;padding:10px 12px;border-radius:12px;background:var(--sun-soft);color:var(--ink)}.howto{display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:14px;background:var(--accent-soft);color:var(--ink);text-decoration:none;font-weight:600;width:100%;line-height:1.35}.howto .ic:first-child{color:var(--accent)}.howto span{flex:1}.keybox{display:flex;flex-direction:column;gap:12px;width:100%}.field{display:flex;flex-direction:column;gap:5px;font-weight:600;font-size:.92em}.keyinput{display:flex;align-items:center;gap:4px;border:1.5px solid var(--line-2);border-radius:14px;background:var(--paper);padding:3px 6px 3px 0}.keyinput:focus-within{border-color:var(--accent)}.keyinput input{flex:1;min-width:0;border:0;outline:0;background:none;padding:11px 12px;font-family:ui-monospace,Consolas,monospace;font-size:15px;font-weight:400}select{padding:10px 12px;border-radius:12px;border:1.5px solid var(--line-2);background:var(--paper);font-weight:500;max-width:100%}.ok-line{display:flex;align-items:center;gap:8px;font-weight:650;color:var(--ok);line-height:1.4}.ok-line.small{font-size:.9em;font-weight:600}.masked{align-self:flex-start;padding:5px 10px;border-radius:10px;background:var(--paper-2);overflow-wrap:anywhere}.notice{display:flex;gap:10px;padding:12px 14px;border-radius:14px;background:var(--paper-2);font-size:.93em;line-height:1.6}.notice .ic{flex:none;margin-top:3px;color:var(--ink-2)}.device{display:flex;flex-direction:column;gap:12px}.device h3{font-size:1em}.models{display:grid;gap:8px}.model{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border-radius:14px;border:1.5px solid var(--line-2);cursor:pointer;line-height:1.4}.model.on{border-color:var(--accent);background:var(--accent-soft)}.model input{margin-top:5px;accent-color:var(--accent);width:18px;height:18px;flex:none}.model b,.model small{display:block}.model small b{display:inline}.consent{display:flex;gap:10px;align-items:flex-start;font-size:.93em;line-height:1.5;cursor:pointer}.consent input{margin-top:3px;accent-color:var(--accent);width:20px;height:20px;flex:none}.download{display:flex;flex-direction:column;gap:8px}.dl-head{display:flex;justify-content:space-between;gap:10px}.bar{height:14px;border-radius:99px;background:var(--paper-2);border:1.5px solid var(--line-2);overflow:hidden}.bar i{display:block;height:100%;background:repeating-linear-gradient(-45deg,var(--accent) 0 10px,color-mix(in srgb,var(--accent) 80%,#fff) 10px 20px);border-radius:99px;transition:width .3s}.steps{list-style:none;padding:0;margin:0;display:grid;gap:14px}.stepcard{display:grid;grid-template-columns:auto 1fr;gap:12px;padding:16px 14px;border-radius:22px;background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 3px 0 var(--line-2)}.step-n{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:var(--accent-ink);font:700 1.15em var(--head);box-shadow:0 3px 0 var(--accent-2)}.step-text{display:flex;flex-direction:column;gap:8px;align-items:flex-start}.step-text h2{font-size:1.16em;padding-top:5px}.step-text p{color:var(--ink-2);line-height:1.6}.stepcard figure{grid-column:1 / -1;margin:4px 0 0}figcaption{font-size:.74em;color:var(--ink-3);margin-top:6px;text-align:center}.pic{border-radius:14px;border:1.5px solid var(--line-2);background:var(--paper);overflow:hidden;font-family:var(--body);max-width:440px;margin:0 auto}.pic-bar{display:flex;align-items:center;gap:5px;padding:7px 10px;background:var(--paper-2);border-bottom:1.5px solid var(--line)}.pic-bar i{width:8px;height:8px;border-radius:50%;background:var(--line-2)}.pic-bar span{margin-left:8px;font-size:.72em;color:var(--ink-2);background:var(--card);padding:1px 10px;border-radius:99px;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pic-body{padding:16px;display:flex;flex-direction:column;gap:10px;min-height:120px;justify-content:center}.pic-body.center{align-items:center}.pic-g{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:var(--card);border:1.5px solid var(--line-2);font:800 1.2em var(--body);color:#4285f4}.pic-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:99px;background:var(--card);border:1.5px solid var(--line-2);font-size:.82em;font-weight:600;white-space:nowrap;align-self:flex-start}.pic-body.center .pic-btn{align-self:center}.pic-btn.right{align-self:flex-end}.pic-btn .ic{width:15px;height:15px}.hot{position:relative;border-color:var(--bad)!important;box-shadow:0 0 0 4px color-mix(in srgb,var(--bad) 22%,transparent);animation:hot 1.6s ease-in-out infinite}@keyframes hot{50%{box-shadow:0 0 0 8px color-mix(in srgb,var(--bad) 8%,transparent)}}.pic-line{height:9px;border-radius:99px;background:var(--line)}.w50{width:50%}.w60{width:60%}.w70{width:70%}.w90{width:90%}.pic-dialog{display:flex;flex-direction:column;gap:9px;padding:14px;border-radius:12px;background:var(--card);border:1.5px solid var(--line)}.pic-check{display:flex;align-items:center;gap:8px;color:var(--ok)}.pic-check .ic{width:18px;height:18px;border:1.5px solid var(--ok);border-radius:5px;padding:1px}.pic-check .pic-line{flex:none}.pic-row{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:.9em}.pic-keyrow{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;background:var(--card);border:1.5px solid var(--line)}.pic-keyrow code{flex:1;color:var(--ink-2);overflow:hidden;white-space:nowrap}.pic-copy{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;border:1.5px solid var(--line-2)}.pic-copy .ic{width:17px;height:17px}.notes{padding:16px;border-radius:22px;background:var(--sun-soft)}.notes h2{font-size:1.16em;margin-bottom:8px}.notes ul{margin:0;padding-left:1.3em;display:grid;gap:8px;line-height:1.6;font-size:.95em}.notes li::marker{color:var(--sun-2)}.paste{padding:16px 14px;border-radius:22px;background:var(--card);border:1.5px solid var(--accent);box-shadow:0 3px color-mix(in srgb,var(--accent) 50%,var(--line-2));display:flex;flex-direction:column;gap:12px}.paste h2{font-size:1.16em}@media(min-width:720px){.stepcard{grid-template-columns:auto 1fr 300px;align-items:start}.stepcard figure{grid-column:auto;margin:0}}.prose{gap:0}.prose h1{font-size:clamp(1.6rem,6vw,2.1rem);margin-bottom:10px}.prose h2{font-size:1.2em;margin:1.5em 0 .5em}.prose p,.prose ul{margin:0 0 .8em;line-height:1.75}.prose ul{padding-left:1.3em}.prose li{margin:.4em 0}.prose .lead{font-size:1.08em;color:var(--ink-2)}#layer{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;display:none;align-items:flex-end;justify-content:center}#layer.open{display:flex}.veil{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--veil);animation:fade .2s both}@keyframes fade{0%{opacity:0}}.sheet,.quiz{position:relative;width:100%;max-width:520px;max-height:92dvh;overflow-y:auto;background:var(--paper);border-radius:26px 26px 0 0;padding:22px 18px calc(20px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:12px;animation:up .3s cubic-bezier(.2,.8,.2,1) both;border:1.5px solid var(--line-2);border-bottom:0}@keyframes up{0%{transform:translateY(40px);opacity:0}}.sheet h2{font-size:1.35em;padding-right:44px}.sheet h3{font-size:.86em;color:var(--ink-2);font-family:var(--body);font-weight:600;margin-top:6px}.sheet p{color:var(--ink-2);line-height:1.6}.sheet-x{position:absolute;right:10px;top:10px;z-index:2;background:var(--card);border:1.5px solid var(--line)}.sheet-buddy{width:72px;height:72px}.sheet-acts{display:flex;flex-direction:column;gap:10px;margin-top:6px}.classes{display:flex;flex-wrap:wrap;gap:8px}.klass{min-width:52px;min-height:42px;padding:4px 13px;border-radius:12px;border:1.5px solid var(--line-2);background:var(--card);font-weight:600}.klass.on{background:var(--accent);color:var(--accent-ink);border-color:var(--accent-2)}.modes{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mode{padding:11px 12px;border-radius:16px;border:1.5px solid var(--line-2);background:var(--card);text-align:left;line-height:1.35;display:flex;flex-direction:column;gap:3px}.mode.on{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 1.5px var(--accent)}.picker .subjects{grid-template-columns:repeat(4,1fr);gap:8px}.picker .subject{padding:9px 2px 7px;font-size:.8em}.picker .glyph{width:34px;height:34px}.card-img{width:100%;max-width:300px;align-self:center;border-radius:16px;border:1.5px solid var(--line-2);box-shadow:0 8px 24px var(--shadow)}.quiz{min-height:min(640px,92dvh);padding-top:20px;gap:14px}.quiz-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-right:48px;font-weight:650;color:var(--ink-2);font-size:.92em;min-height:36px}.pips{display:inline-flex;gap:6px}.pips i{width:22px;height:8px;border-radius:99px;background:var(--line-2);transition:background .2s}.pips i.now{background:var(--sun)}.pips i.ok{background:var(--ok)}.pips i.no{background:var(--bad)}.pips.big i{width:34px;height:10px}.quiz-q{font:650 1.3em/1.5 var(--head);margin:4px 0 2px;animation:rise .3s both}.options{display:grid;gap:10px}.option{display:flex;align-items:center;gap:12px;padding:11px 14px 11px 11px;border-radius:18px;background:var(--card);border:1.5px solid var(--line-2);box-shadow:0 3px 0 var(--line-2);text-align:left;min-height:58px;transition:transform .08s,border-color .15s,background .2s;animation:rise .3s both;line-height:1.5}.option:nth-child(2){animation-delay:.04s}.option:nth-child(3){animation-delay:.08s}.option:nth-child(4){animation-delay:.12s}.option>b{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--paper-2);font-family:var(--head);flex:none}.option>.md{flex:1;min-width:0;font-weight:500;line-height:1.5}.option:not(:disabled):hover{border-color:var(--accent)}.option:not(:disabled):active{transform:translateY(2px);box-shadow:0 1px 0 var(--line-2)}.option:disabled{animation:none;color:var(--ink)}.option.right{background:var(--ok-soft);border-color:var(--ok);box-shadow:0 3px color-mix(in srgb,var(--ok) 60%,transparent)}.option.right>b{background:var(--ok);color:#fff}.option.wrong{background:var(--bad-soft);border-color:var(--bad);box-shadow:0 3px color-mix(in srgb,var(--bad) 60%,transparent)}.option.wrong>b{background:var(--bad);color:#fff}.option.dim{opacity:.55;box-shadow:none}.mark{display:grid;place-items:center;flex:none}.right .mark{color:var(--ok)}.wrong .mark{color:var(--bad)}.why{padding:12px 14px;border-radius:16px;line-height:1.6;animation:rise .3s both;display:flex;flex-direction:column;gap:2px}.why.good{background:var(--ok-soft)}.why.bad{background:var(--sun-soft)}.why b{font-family:var(--head);font-size:1.06em}.why.good b{color:var(--ok)}.quiz-wait{margin:auto;display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;padding:20px 6px}.quiz-wait p{font:600 1.15em var(--head)}.result{margin:auto 0;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;padding-top:8px}.result h2{font-size:1.3em}.result p{color:var(--ink-2)}.ring{position:relative;width:190px;height:190px}.ring>svg{width:100%;height:100%;transform:rotate(-90deg)}.ring circle{fill:none;stroke-width:11;stroke-linecap:round}.ring .track{stroke:var(--line)}.ring .fill{stroke:var(--sun);animation:ring 1s cubic-bezier(.3,.7,.2,1) both}.ring.great .fill{stroke:var(--ok)}@keyframes ring{0%{stroke-dashoffset:var(--from)}}.ring-text{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.1}.ring-text b{font:800 3em var(--head)}.ring-buddy{position:absolute;width:60px;height:60px;right:-8px;top:-10px;transform:rotate(14deg);animation:pop .5s .7s cubic-bezier(.3,1.6,.5,1) both}@keyframes pop{0%{transform:scale(0) rotate(-30deg)}}@media(min-width:720px){#layer{align-items:center}.sheet,.quiz{border-radius:26px;border-bottom:1.5px solid var(--line-2);box-shadow:0 30px 80px var(--shadow)}.quiz{max-width:600px;padding:26px 26px 24px}}#toasts{position:fixed;left:0;right:0;bottom:calc(92px + env(safe-area-inset-bottom));z-index:80;display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none;padding:0 16px}.toast{padding:10px 18px;border-radius:16px;background:var(--ink);color:var(--paper);font-weight:600;font-size:.92em;box-shadow:0 10px 30px var(--shadow);animation:up .25s both;text-align:center;line-height:1.4;max-width:440px;transition:opacity .3s,transform .3s}.toast.out{opacity:0;transform:translateY(8px)}::selection{background:color-mix(in srgb,var(--sun) 55%,transparent)}.view::-webkit-scrollbar,.side-nav::-webkit-scrollbar,.sheet::-webkit-scrollbar,.quiz::-webkit-scrollbar{width:10px}.view::-webkit-scrollbar-thumb,.side-nav::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:99px;border:3px solid var(--paper)}@media(prefers-reduced-motion:reduce){html:not(.capturing) *,html:not(.capturing) *:before,html:not(.capturing) *:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.plain{--paper: #ffffff;--paper-2: #f3f4f6;--card: #ffffff;--line: #e5e7eb;--line-2: #d1d5db;--accent: #2563eb;--accent-2: #2563eb;--accent-soft: #eff6ff;--sun: #e5e7eb;--sun-2: #d1d5db;--sun-soft: #f3f4f6;--sun-ink: #111827;--rule: transparent;--margin: transparent;--head: system-ui, "Hind Siliguri", sans-serif;--body: system-ui, "Hind Siliguri", sans-serif}.plain *{animation:none!important;box-shadow:none!important}.plain .hero{border-radius:12px;padding:20px}.plain .hero-text{max-width:none}.plain .ava,.plain .empty-buddy,.plain .page-buddy,.plain .sheet-buddy,.plain .brand .buddy,.plain .wordmark .buddy,.plain .ring-buddy{display:none}.plain .demo-card,.plain .way,.plain .btn,.plain .chip,.plain .composer,.plain .msg .bubble,.plain .option,.plain .stepcard,.plain .starter{border-radius:10px;border-width:1px}.plain .glyph{background:var(--paper-2);color:#374151}.plain .demo-card:after{display:none}