/* =============================================================
   計量心理學：測量、模型與推論 — Editorial Dark
   book.css
   ============================================================= */

:root{
  --ink:#0b0f15; --ink-2:#101720; --ink-3:#161f2b; --ink-4:#1d2836;
  --rule:#243040; --rule-soft:#1a2431;
  --paper:#e9e5db; --paper-dim:#a3adbd; --paper-faint:#6e7889;
  --brass:#cfae63; --brass-dim:#8c7540; --brass-wash:rgba(207,174,99,.10);
  --slate:#7fa8c9; --slate-wash:rgba(127,168,201,.10);
  --sel:rgba(207,174,99,.22);
  --serif:"Source Serif 4","Noto Serif TC","Noto Serif CJK TC","Songti TC","PingFang TC","Microsoft JhengHei",Georgia,serif;
  --sans:"Inter","Noto Sans TC","Noto Sans CJK TC","PingFang TC","Microsoft JhengHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --sbw:19rem; --measure:44rem;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 32px rgba(0,0,0,.28);
}
:root[data-theme="paper"]{
  --ink:#f6f2e9; --ink-2:#fffdf8; --ink-3:#efe9dc; --ink-4:#e6dfd0;
  --rule:#ded5c3; --rule-soft:#ebe4d5;
  --paper:#1c1b17; --paper-dim:#565248; --paper-faint:#8b8578;
  --brass:#8a6a1f; --brass-dim:#a89464; --brass-wash:rgba(138,106,31,.09);
  --slate:#3f6c92; --slate-wash:rgba(63,108,146,.08);
  --sel:rgba(138,106,31,.20);
  --shadow:0 1px 2px rgba(60,50,30,.08),0 8px 28px rgba(60,50,30,.07);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5rem}
body{
  margin:0;background:var(--ink);color:var(--paper);
  font-family:var(--serif);font-size:17px;line-height:1.95;
  font-feature-settings:"kern" 1;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
::selection{background:var(--sel)}
a{color:inherit}

/* ---------- top progress + chrome ---------- */
#progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--brass-dim),var(--brass));transition:width .12s linear}

.topbar{position:fixed;top:0;left:0;right:0;height:3.25rem;z-index:50;
  display:flex;align-items:center;gap:.75rem;padding:0 1rem;
  background:color-mix(in srgb,var(--ink) 88%,transparent);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--rule-soft)}
@media(min-width:1080px){.topbar{display:none}}
.topbar .tb-title{font-family:var(--sans);font-size:.82rem;letter-spacing:.04em;
  color:var(--paper-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}

.iconbtn{display:inline-flex;align-items:center;justify-content:center;
  width:2.1rem;height:2.1rem;border:1px solid var(--rule);border-radius:.4rem;
  background:transparent;color:var(--paper-dim);cursor:pointer;flex:none;
  transition:border-color .15s,color .15s,background .15s}
.iconbtn:hover{color:var(--brass);border-color:var(--brass-dim);background:var(--brass-wash)}
.iconbtn svg{width:1.05rem;height:1.05rem;stroke:currentColor;fill:none;stroke-width:1.6}

/* ---------- sidebar ---------- */
.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sbw);z-index:55;
  background:var(--ink-2);border-right:1px solid var(--rule-soft);
  display:flex;flex-direction:column;transform:translateX(-100%);
  transition:transform .28s cubic-bezier(.4,0,.2,1)}
.sidebar.open{transform:none}
@media(min-width:1080px){.sidebar{transform:none}}

.sb-head{padding:1.5rem 1.35rem 1rem;border-bottom:1px solid var(--rule-soft)}
.sb-head .kicker{font-family:var(--sans);font-size:.6rem;letter-spacing:.24em;
  text-transform:uppercase;color:var(--brass-dim);margin-bottom:.5rem}
.sb-head .bt{display:block;font-size:1.22rem;font-weight:600;letter-spacing:.04em;
  line-height:1.4;text-decoration:none;color:var(--paper)}
.sb-head .bt:hover{color:var(--brass)}
.sb-head .bs{font-size:.82rem;color:var(--paper-dim);letter-spacing:.05em;margin-top:.2rem}
.sb-head .ba{font-family:var(--sans);font-size:.7rem;color:var(--paper-faint);
  letter-spacing:.06em;margin-top:.45rem}

.sb-tools{padding:.85rem 1.1rem;display:flex;gap:.5rem;border-bottom:1px solid var(--rule-soft)}
.searchbtn{flex:1;display:flex;align-items:center;gap:.5rem;padding:.45rem .65rem;
  font-family:var(--sans);font-size:.78rem;color:var(--paper-faint);
  background:var(--ink-3);border:1px solid var(--rule);border-radius:.4rem;cursor:pointer;
  transition:border-color .15s,color .15s}
.searchbtn:hover{border-color:var(--brass-dim);color:var(--paper-dim)}
.searchbtn svg{width:.95rem;height:.95rem;stroke:currentColor;fill:none;stroke-width:1.7;flex:none}
.searchbtn kbd{margin-left:auto;font-family:var(--sans);font-size:.62rem;padding:.08rem .3rem;
  border:1px solid var(--rule);border-radius:.22rem;color:var(--paper-faint)}

.sb-nav{flex:1;overflow-y:auto;padding:1rem 0 3rem;scrollbar-width:thin;
  scrollbar-color:var(--rule) transparent}
.sb-nav::-webkit-scrollbar{width:8px}
.sb-nav::-webkit-scrollbar-thumb{background:var(--rule);border-radius:4px}

.part-h{display:flex;align-items:baseline;gap:.5rem;padding:1.15rem 1.35rem .4rem;
  font-family:var(--sans);font-size:.68rem;letter-spacing:.1em;color:var(--paper-faint)}
.part-h .rn{font-family:var(--serif);font-size:.76rem;letter-spacing:.06em;
  color:var(--brass-dim);font-weight:600;flex:none}
.part-h .pt{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.ch-link{display:flex;gap:.7rem;padding:.34rem 1.35rem;text-decoration:none;
  font-size:.86rem;line-height:1.6;color:var(--paper-dim);
  border-left:2px solid transparent;transition:color .14s,background .14s,border-color .14s}
.ch-link .n{font-variant-numeric:tabular-nums;color:var(--paper-faint);flex:none;
  font-size:.78rem;padding-top:.14rem;min-width:1.3rem;text-align:right}
.ch-link:hover{color:var(--paper);background:var(--ink-3)}
.ch-link.current{color:var(--brass);border-left-color:var(--brass);background:var(--brass-wash)}
.ch-link.current .n{color:var(--brass-dim)}

.scrim{position:fixed;inset:0;z-index:54;background:rgba(0,0,0,.55);
  opacity:0;pointer-events:none;transition:opacity .25s}
.scrim.on{opacity:1;pointer-events:auto}
@media(min-width:1080px){.scrim{display:none}}

/* ---------- layout ---------- */
.shell{margin-left:0;padding-top:3.25rem}
@media(min-width:1080px){.shell{margin-left:var(--sbw);padding-top:0}}

/* =============================================================
   HOME
   ============================================================= */
.hero{position:relative;overflow:hidden;padding:5rem 1.5rem 4rem;
  min-height:min(92vh,50rem);display:flex;align-items:center;
  border-bottom:1px solid var(--rule-soft)}
@media(min-width:1080px){.hero{padding:6rem 4rem}}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(90rem 44rem at 18% -12%,var(--brass-wash),transparent 62%),
    radial-gradient(70rem 40rem at 96% 8%,var(--slate-wash),transparent 60%)}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--rule-soft) 1px,transparent 1px);
  background-size:100% 2.4rem;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 30%,#000 70%,transparent);
  mask-image:linear-gradient(180deg,transparent,#000 30%,#000 70%,transparent)}
.ghost{position:absolute;right:-4vw;top:50%;transform:translateY(-50%);
  font-size:min(52vw,38rem);line-height:.78;font-weight:700;color:var(--paper);
  opacity:.035;pointer-events:none;user-select:none;letter-spacing:-.04em}
:root[data-theme="paper"] .ghost{opacity:.05}
.hero-in{position:relative;max-width:60rem}
.eyebrow{font-family:var(--sans);font-size:.66rem;letter-spacing:.34em;
  text-transform:uppercase;color:var(--brass);margin-bottom:1.6rem}
.h-title{margin:0;font-size:clamp(3rem,10vw,6.4rem);line-height:1.02;
  font-weight:700;letter-spacing:.02em}
.h-sub{margin:.9rem 0 0;font-size:clamp(1.1rem,3vw,1.75rem);font-weight:400;
  color:var(--paper-dim);letter-spacing:.16em}
.h-rule{width:5rem;height:2px;background:var(--brass);margin:2rem 0 1.5rem;opacity:.85}
.h-en{font-family:var(--sans);font-size:.8rem;letter-spacing:.14em;
  color:var(--paper-faint);line-height:1.8;max-width:34rem}
.h-author{margin-top:2.2rem;font-size:1.05rem;letter-spacing:.08em}
.h-author .en{font-family:var(--sans);font-size:.78rem;letter-spacing:.12em;
  color:var(--paper-faint);margin-left:.6rem}
.h-aff{font-family:var(--sans);font-size:.78rem;color:var(--paper-faint);
  line-height:1.9;margin-top:.35rem}
.cta{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:2.6rem}
.btn{display:inline-flex;align-items:center;gap:.55rem;padding:.72rem 1.4rem;
  font-family:var(--sans);font-size:.82rem;letter-spacing:.08em;text-decoration:none;
  border:1px solid var(--brass-dim);border-radius:.35rem;color:var(--brass);
  transition:background .18s,color .18s,border-color .18s}
.btn:hover{background:var(--brass);color:var(--ink);border-color:var(--brass)}
.btn.ghost-btn{border-color:var(--rule);color:var(--paper-dim)}
.btn.ghost-btn:hover{background:var(--ink-3);color:var(--paper);border-color:var(--rule)}

.sec{padding:4.5rem 1.5rem;border-bottom:1px solid var(--rule-soft)}
@media(min-width:1080px){.sec{padding:5.5rem 4rem}}
.sec-h{display:flex;align-items:baseline;gap:1rem;margin-bottom:.6rem}
.sec-h .num{font-family:var(--sans);font-size:.64rem;letter-spacing:.28em;color:var(--brass)}
.sec-h h2{margin:0;font-size:1.6rem;font-weight:600;letter-spacing:.06em}
.sec-lead{color:var(--paper-dim);max-width:var(--measure);margin:0 0 2.5rem;font-size:.98rem}

.parts{display:grid;gap:1px;background:var(--rule-soft);border:1px solid var(--rule-soft)}
@media(min-width:820px){.parts{grid-template-columns:1fr 1fr}}
.part{background:var(--ink);padding:1.7rem 1.6rem;transition:background .2s}
.part:hover{background:var(--ink-2)}
.part-top{display:flex;align-items:baseline;gap:.8rem;margin-bottom:1.1rem;
  padding-bottom:.8rem;border-bottom:1px solid var(--rule-soft)}
.part-top .rn{font-size:1.5rem;font-weight:700;color:var(--brass-dim);
  line-height:1;letter-spacing:.02em;flex:none}
.part-top h3{margin:0;font-size:1rem;font-weight:600;letter-spacing:.05em;line-height:1.5}
.part ol{list-style:none;margin:0;padding:0}
.part li{margin:0}
.part li a{display:flex;gap:.8rem;padding:.36rem 0;text-decoration:none;
  font-size:.9rem;line-height:1.65;color:var(--paper-dim);transition:color .15s}
.part li a:hover{color:var(--brass)}
.part li a .n{font-variant-numeric:tabular-nums;color:var(--paper-faint);
  flex:none;min-width:2.6rem;font-size:.8rem;padding-top:.12rem}

.paths{display:grid;gap:1.5rem}
@media(min-width:900px){.paths{grid-template-columns:repeat(3,1fr)}}
.path{border:1px solid var(--rule-soft);border-top:2px solid var(--brass-dim);
  padding:1.5rem;background:var(--ink-2)}
.path h4{margin:0 0 .5rem;font-size:1rem;font-weight:600;letter-spacing:.05em}
.path .route{font-family:var(--sans);font-size:.72rem;letter-spacing:.1em;
  color:var(--brass);margin-bottom:.9rem}
.path p{margin:0;font-size:.9rem;line-height:1.85;color:var(--paper-dim)}

.about{max-width:var(--measure)}
.about p{margin:0 0 1.2rem;color:var(--paper-dim);font-size:.98rem}
.about p:last-child{margin-bottom:0}

.notes{display:grid;gap:1rem;margin-top:2rem}
@media(min-width:760px){.notes{grid-template-columns:1fr 1fr}}
.note{border-left:2px solid var(--rule);padding:.2rem 0 .2rem 1.1rem}
.note b{display:block;font-family:var(--sans);font-size:.7rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--brass-dim);margin-bottom:.35rem}
.note span{font-size:.9rem;color:var(--paper-dim);line-height:1.8}

/* =============================================================
   CHAPTER
   ============================================================= */
.chwrap{display:block;padding:0 1.5rem}
@media(min-width:1080px){.chwrap{padding:0 3rem}}
@media(min-width:1400px){
  .chwrap{display:grid;grid-template-columns:minmax(0,1fr) 15rem;gap:3.5rem;
    max-width:74rem;margin:0 auto;padding:0 2rem}
}
.chmain{min-width:0;max-width:var(--measure);margin:0 auto;width:100%}
@media(min-width:1400px){.chmain{margin:0}}

.chhead{padding:4.5rem 0 2.5rem;border-bottom:1px solid var(--rule-soft);margin-bottom:3rem}
.chhead .part-tag{font-family:var(--sans);font-size:.64rem;letter-spacing:.24em;
  text-transform:uppercase;color:var(--brass);margin-bottom:1.2rem}
.chhead .chno{display:flex;align-items:baseline;gap:.9rem;margin-bottom:.9rem}
.chhead .chno .big{font-size:3.2rem;font-weight:700;line-height:1;color:var(--brass-dim);
  font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.chhead .chno .lbl{font-family:var(--sans);font-size:.7rem;letter-spacing:.2em;
  color:var(--paper-faint)}
.chhead h1{margin:0;font-size:clamp(1.7rem,4.2vw,2.5rem);font-weight:600;
  line-height:1.42;letter-spacing:.03em}

/* prose */
.prose{padding-bottom:1rem}
.prose h2{margin:3.6rem 0 1.3rem;font-size:1.32rem;font-weight:600;letter-spacing:.05em;
  line-height:1.6;padding-top:.9rem;border-top:1px solid var(--rule-soft);position:relative}
.prose h2::before{content:"";position:absolute;top:-1px;left:0;width:2.5rem;height:1px;
  background:var(--brass)}
.prose h3{margin:2.4rem 0 .9rem;font-size:1.08rem;font-weight:600;letter-spacing:.04em}
.prose p{margin:0 0 1.35rem;text-align:justify;text-justify:inter-ideograph;
  hanging-punctuation:allow-end}
.prose strong{font-weight:600;color:var(--paper)}
.prose em{font-style:italic}
.prose ul,.prose ol{margin:0 0 1.35rem;padding-left:1.5rem;color:var(--paper)}
.prose li{margin-bottom:.5rem}

/* display equations */
.eq{margin:1.9rem 0;padding:.2rem 0;overflow-x:auto;overflow-y:hidden;text-align:center;
  scrollbar-width:thin}
.eq .katex-display{margin:0}
.eq::-webkit-scrollbar{height:6px}
.eq::-webkit-scrollbar-thumb{background:var(--rule);border-radius:3px}

/* boxes */
.box{margin:2.2rem 0;padding:1.4rem 1.5rem;background:var(--ink-2);
  border:1px solid var(--rule-soft);border-left:2px solid var(--brass);border-radius:0 .3rem .3rem 0}
.box-concept{border-left-color:var(--slate)}
.box-head{display:flex;align-items:baseline;gap:.75rem;flex-wrap:wrap;
  margin-bottom:.9rem;padding-bottom:.7rem;border-bottom:1px solid var(--rule-soft)}
.box-label{font-family:var(--sans);font-size:.63rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--brass);flex:none;
  padding:.16rem .5rem;border:1px solid var(--brass-dim);border-radius:.2rem;line-height:1.5}
.box-concept .box-label{color:var(--slate);border-color:var(--slate)}
.box-title{font-size:.95rem;font-weight:600;letter-spacing:.04em;color:var(--paper)}
.box p{margin:0 0 1rem;font-size:.95rem;line-height:1.9}
.box p:last-child{margin-bottom:0}
.box .eq{margin:1.4rem 0}

/* tables */
.tblcap{font-size:.88rem;font-weight:600;letter-spacing:.05em;
  color:var(--paper);margin:0 0 .85rem;line-height:1.6}
.tblwrap{margin:2.2rem 0;overflow-x:auto;scrollbar-width:thin}
.tblwrap::-webkit-scrollbar{height:6px}
.tblwrap::-webkit-scrollbar-thumb{background:var(--rule);border-radius:3px}
table{border-collapse:collapse;width:100%;font-size:.88rem;line-height:1.7}
thead th{font-family:var(--sans);font-weight:600;font-size:.76rem;letter-spacing:.06em;
  color:var(--paper-dim);padding:.6rem .8rem;border-top:1px solid var(--paper-faint);
  border-bottom:1px solid var(--rule);white-space:nowrap}
tbody td{padding:.55rem .8rem;border-bottom:1px solid var(--rule-soft);vertical-align:top}
tbody tr:last-child td{border-bottom:1px solid var(--paper-faint)}

/* citations + references */
.citation{cursor:pointer;border-bottom:1px solid var(--rule-soft);
  transition:border-color .15s,color .15s}
.citation:hover{border-bottom-color:var(--brass);color:var(--brass)}
.citation a{color:inherit;text-decoration:none;border:0}
.csl-entry{scroll-margin-top:5rem}
.csl-entry:target{background:var(--brass-wash);border-radius:.2rem;
  box-shadow:0 0 0 .55rem var(--brass-wash)}
#refs-head{margin:4.5rem 0 1.5rem;padding-top:1.2rem;border-top:1px solid var(--rule);
  font-size:1.1rem;font-weight:600;letter-spacing:.14em;color:var(--paper-dim)}
.csl-bib-body{font-size:.86rem;line-height:1.85;color:var(--paper-dim)}
.csl-entry{padding-left:2rem;text-indent:-2rem;margin-bottom:.85rem;overflow-wrap:break-word}
.csl-entry a{color:var(--brass-dim);text-decoration:none;word-break:break-all}
.csl-entry a:hover{color:var(--brass);text-decoration:underline}

/* cite footer */
.chapcite{margin-top:3rem;padding:1.1rem 1.3rem;background:var(--ink-2);
  border:1px solid var(--rule-soft);border-radius:.3rem;font-size:.8rem;
  color:var(--paper-faint);line-height:1.85}
.chapcite b{display:block;font-family:var(--sans);font-size:.62rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--brass-dim);margin-bottom:.4rem;font-weight:500}

/* chapter footer nav */
.chnav{display:grid;gap:1px;background:var(--rule-soft);border-top:1px solid var(--rule-soft);
  border-bottom:1px solid var(--rule-soft);margin:4rem 0 5rem}
@media(min-width:700px){.chnav{grid-template-columns:1fr 1fr}}
.chnav a{display:block;padding:1.5rem 1.4rem;background:var(--ink);text-decoration:none;
  transition:background .18s}
.chnav a:hover{background:var(--ink-2)}
.chnav .dir{font-family:var(--sans);font-size:.64rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--brass-dim);margin-bottom:.5rem}
.chnav .t{font-size:.95rem;color:var(--paper-dim);line-height:1.65}
.chnav a:hover .t{color:var(--paper)}
.chnav .next{text-align:right}
.chnav .empty{background:var(--ink);opacity:.4}

/* right rail: in-page toc */
.rail{display:none}
@media(min-width:1400px){
  .rail{display:block;position:sticky;top:0;align-self:start;
    max-height:100vh;overflow-y:auto;padding:5.5rem 0 4rem;scrollbar-width:none}
  .rail::-webkit-scrollbar{display:none}
}
.rail .rh{font-family:var(--sans);font-size:.62rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--paper-faint);margin-bottom:1rem;
  padding-bottom:.6rem;border-bottom:1px solid var(--rule-soft)}
.rail a{display:block;padding:.34rem 0 .34rem .8rem;font-size:.8rem;line-height:1.6;
  color:var(--paper-faint);text-decoration:none;border-left:1px solid var(--rule-soft);
  transition:color .15s,border-color .15s}
.rail a:hover{color:var(--paper-dim)}
.rail a.active{color:var(--brass);border-left-color:var(--brass)}

/* =============================================================
   SEARCH OVERLAY
   ============================================================= */
.ovl{position:fixed;inset:0;z-index:70;display:none;padding:4.5rem 1rem 1rem;
  background:rgba(3,6,10,.72);backdrop-filter:blur(6px)}
:root[data-theme="paper"] .ovl{background:rgba(120,110,90,.35)}
.ovl.on{display:block}
.spanel{max-width:42rem;margin:0 auto;background:var(--ink-2);border:1px solid var(--rule);
  border-radius:.5rem;box-shadow:var(--shadow);overflow:hidden;
  display:flex;flex-direction:column;max-height:min(34rem,80vh)}
.sfield{display:flex;align-items:center;gap:.7rem;padding:.9rem 1.1rem;
  border-bottom:1px solid var(--rule-soft)}
.sfield svg{width:1.05rem;height:1.05rem;stroke:var(--paper-faint);fill:none;stroke-width:1.7;flex:none}
.sfield input{flex:1;background:transparent;border:0;outline:0;color:var(--paper);
  font-family:var(--serif);font-size:1rem;letter-spacing:.03em}
.sfield input::placeholder{color:var(--paper-faint)}
.sfield input::-webkit-search-cancel-button,
.sfield input::-webkit-search-decoration{-webkit-appearance:none;appearance:none}
.sfield .esc{font-family:var(--sans);font-size:.62rem;padding:.12rem .35rem;
  border:1px solid var(--rule);border-radius:.22rem;color:var(--paper-faint)}
.sres{overflow-y:auto;padding:.4rem 0}
.sres a{display:block;padding:.7rem 1.1rem;text-decoration:none;border-left:2px solid transparent}
.sres a:hover,.sres a.sel{background:var(--ink-3);border-left-color:var(--brass)}
.sres .loc{font-family:var(--sans);font-size:.66rem;letter-spacing:.1em;
  color:var(--brass-dim);margin-bottom:.25rem}
.sres .snip{font-size:.85rem;line-height:1.7;color:var(--paper-dim)}
.sres mark{background:var(--sel);color:var(--paper);padding:0 .1em;border-radius:.1em}
.sempty{padding:1.6rem 1.1rem;text-align:center;font-size:.85rem;color:var(--paper-faint)}

/* site footer */
.foot{padding:3rem 1.5rem 4rem;border-top:1px solid var(--rule-soft);
  font-family:var(--sans);font-size:.75rem;line-height:2;color:var(--paper-faint)}
@media(min-width:1080px){.foot{padding:3rem 4rem 4rem}}
.foot a{color:var(--paper-dim);text-decoration:none;border-bottom:1px solid var(--rule)}
.foot a:hover{color:var(--brass);border-bottom-color:var(--brass-dim)}
.foot .fl{display:flex;flex-wrap:wrap;gap:.4rem 1.5rem;margin-bottom:.8rem}

/* KaTeX tuning: keep CJK inside \text{} legible */
.katex{font-size:1.02em}
.katex .mord.cjk_fallback{font-family:var(--serif)}
@media print{
  .sidebar,.topbar,.rail,.chnav,.ovl,#progress,.scrim{display:none!important}
  .shell{margin:0}body{background:#fff;color:#000;font-size:11pt}
}