/* UStudy knowledge base. Light-only brand theme.
   Layout: slim brand header, left sidebar (subjects -> sections -> topics), reading column, in-page contents on wide screens. */
:root{
  --blue:#3B46E0; --blue-deep:#2C35C4; --blue-soft:#EEF0FF;
  --navy:#06222E; --green:#03FF86; --green-soft:#E3FFF1; --green-ink:#00884A;
  --sky:#60DCFF; --orange:#F0502D; --orange-soft:#FEEDE7; --yellow:#FFFF00;
  --bg:#FFFFFF; --panel:#F6F7FC; --surface:#FFFFFF; --line:#E4E6F2; --line-2:#D3D7EA; --muted:#5A6475; --faint:#8A93A6;
  --accent:var(--blue); --accent-soft:var(--blue-soft); /* set per subject */
  --font:"Golos Text","Segoe UI",system-ui,-apple-system,sans-serif;
  --head:var(--font); --body:var(--font);
  --r:12px; --top:56px; --side:296px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--top) + 16px)}
body{background:var(--bg);color:var(--navy);font-family:var(--font);font-size:17px;line-height:1.65;margin:0;font-feature-settings:"kern","liga"}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--blue)}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--orange);outline-offset:2px;border-radius:6px}
h1,h2,h3,h4{font-family:var(--head);text-wrap:balance;margin:0;letter-spacing:-.01em}
sub,sup{font-size:.72em;line-height:0}
.katex{font-size:1.04em}
.katex-display{margin:.6em 0;overflow-x:auto;overflow-y:hidden;padding:2px 0}
.num,.t-num,.rail .d,.fact,.code{font-variant-numeric:tabular-nums}

/* subject accents */
[data-subj="hist"]{--accent:#E2461F;--accent-soft:#FEEDE7}
[data-subj="math"]{--accent:#3B46E0;--accent-soft:#EEF0FF}
[data-subj="chem"]{--accent:#00884A;--accent-soft:#E3FFF1}
[data-subj="bio"]{--accent:#0B7F8C;--accent-soft:#DDF6FA}
[data-subj="phys"]{--accent:#B45F00;--accent-soft:#FFF1D6}
[data-subj="inf"]{--accent:#0A6FB8;--accent-soft:#E6F4FB}

/* ---------- header ---------- */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;height:var(--top);background:var(--blue);color:#fff;display:flex;align-items:center;gap:12px;
  padding-left:max(12px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.menu-btn{display:none;border:0;background:none;color:#fff;width:40px;height:40px;border-radius:10px;cursor:pointer;place-items:center}
.menu-btn:hover{background:rgba(255,255,255,.12)}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none;color:#fff;min-width:0}
.logo svg{height:26px;width:auto;display:block;flex:none}
.logo span{font-size:14px;font-weight:500;opacity:.88;border-left:1px solid rgba(255,255,255,.35);padding-left:12px;white-space:nowrap}
.lang{display:flex;margin-left:auto;background:rgba(255,255,255,.14);border-radius:999px;padding:3px}
.lang button{border:0;background:none;padding:4px 12px;font-size:13px;font-weight:600;cursor:pointer;color:#fff;border-radius:999px}
.lang button[aria-pressed="true"]{background:#fff;color:var(--blue)}

/* ---------- shell ---------- */
.shell{display:grid;grid-template-columns:var(--side) minmax(0,1fr);min-height:calc(100vh - var(--top))}
.toc{display:none}
@media (min-width:1320px){.shell{grid-template-columns:var(--side) minmax(0,1fr) 230px}.toc{display:block}}

/* ---------- sidebar ---------- */
.side{position:sticky;top:calc(var(--top) + env(safe-area-inset-top,0px));height:calc(100vh - var(--top) - env(safe-area-inset-top,0px));overflow-y:auto;overscroll-behavior:contain;
  background:var(--panel);border-right:1px solid var(--line);padding:14px 10px 40px;font-size:15px;line-height:1.4;scrollbar-width:thin}
.side-search{position:relative;margin:0 4px 12px}
.side-search input{width:100%;border:1px solid var(--line-2);background:#fff;border-radius:10px;padding:9px 12px 9px 34px;font-size:15px}
.side-search input:focus{border-color:var(--blue);outline:none;box-shadow:0 0 0 3px var(--blue-soft)}
.side-search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--faint)}
.nav-link{display:flex;align-items:center;gap:10px;width:100%;border:0;background:none;text-align:left;padding:8px 10px;border-radius:9px;cursor:pointer;font-weight:500}
.nav-link:hover{background:#ECEEF8}
.nav-link[aria-current="true"]{background:#fff;box-shadow:inset 0 0 0 1px var(--line-2);font-weight:600}
.nav-link .cnt{margin-left:auto;font-size:12px;font-weight:700;background:var(--orange-soft);color:var(--orange);border-radius:999px;padding:1px 8px}
.nav-h{font-size:13px;color:var(--faint);font-weight:500;margin:18px 10px 6px}
.sn{margin-top:2px}
.sn-head{display:grid;grid-template-columns:30px 1fr auto 16px;gap:10px;align-items:center;width:100%;border:0;background:none;text-align:left;padding:7px 10px;border-radius:9px;cursor:pointer}
.sn-head:hover{background:#ECEEF8}
.sn-ic{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-weight:700;font-size:13px;background:var(--accent-soft);color:var(--accent)}
.sn-name{font-weight:600;min-width:0}
.sn-count{font-size:12px;color:var(--faint);font-variant-numeric:tabular-nums}
.sn-chev{transition:transform .18s ease;color:var(--faint)}
.sn-head[aria-expanded="true"] .sn-chev{transform:rotate(90deg)}
.sn-body{margin:4px 0 10px 24px;padding-left:12px;border-left:2px solid var(--accent-soft)}
.sn-links{display:flex;gap:4px;flex-wrap:wrap;margin:4px 0 8px}
.sn-links button{border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:3px 10px;font-size:13px;font-weight:500;cursor:pointer}
.sn-links button:hover{border-color:var(--accent);color:var(--accent)}
.sn-links button[aria-current="true"]{background:var(--accent);border-color:var(--accent);color:#fff}
.sn-sec-h{font-size:12.5px;color:var(--muted);font-weight:600;margin:12px 0 3px 8px;line-height:1.35}
.sn-sec-h:first-of-type{margin-top:4px}
.sn-t{display:grid;grid-template-columns:24px 1fr 8px;gap:6px;align-items:start;width:100%;border:0;background:none;text-align:left;padding:5px 8px;border-radius:8px;cursor:pointer;font-size:14px;color:#2A3A47}
.sn-t:hover{background:#ECEEF8;color:var(--navy)}
.sn-t .n{color:var(--faint);font-size:12.5px;font-weight:600;padding-top:1px;font-variant-numeric:tabular-nums}
.sn-t .tt{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.sn-t .dot{width:7px;height:7px;border-radius:50%;margin-top:7px}
.sn-t .dot.weak{background:var(--orange)}
.sn-t .dot.seen{background:var(--line-2)}
.sn-t[aria-current="true"]{background:var(--accent);color:#fff;font-weight:500}
.sn-t[aria-current="true"] .n{color:rgba(255,255,255,.75)}
.sn-t[aria-current="true"] .dot{background:#fff}
.side-soon{margin:22px 10px 0;font-size:13px;color:var(--faint);line-height:1.5}
.side-soon b{font-weight:600;color:var(--muted)}
.sr-group{margin:10px 0 4px 10px;font-size:13px;font-weight:600;color:var(--muted)}
.side-empty{color:var(--muted);font-size:14px;padding:8px 10px}
mark.hl{background:#FFF59A;color:inherit;border-radius:2px}

/* mobile drawer */
.scrim{display:none}
@media (max-width:1099px){
  .shell{grid-template-columns:minmax(0,1fr)}
  .menu-btn{display:grid}
  .side{position:fixed;z-index:25;left:0;top:calc(var(--top) + env(safe-area-inset-top,0px));width:min(340px,88vw);transform:translateX(-102%);transition:transform .22s ease;box-shadow:none}
  body.side-open .side{transform:none;box-shadow:12px 0 40px rgba(6,34,46,.18)}
  body.side-open .scrim{display:block;position:fixed;inset:0;top:var(--top);background:rgba(6,34,46,.35);z-index:24}
  body.side-open{overflow:hidden}
}
@media (max-width:480px){.logo span{display:none}}

/* ---------- main column ---------- */
main{min-width:0;padding:32px max(16px,env(safe-area-inset-right,0px)) 72px max(16px,env(safe-area-inset-left,0px))}
.view{max-width:740px;margin:0 auto}
.loading{color:var(--muted);padding:40px 0}
.empty{color:var(--muted);padding:24px 0}
.foot{margin-top:56px;padding-top:18px;border-top:1px solid var(--line);color:var(--faint);font-size:13px}
.crumbs{font-size:14px;color:var(--muted);display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.crumbs button{border:0;background:none;padding:0;color:var(--muted);cursor:pointer;font-weight:500;text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:3px}
.crumbs button:hover{color:var(--accent);text-decoration-color:currentColor}
.crumbs .sep{color:var(--line-2)}

/* home */
.home-hero{position:relative;overflow:hidden;border-radius:18px;background:var(--blue);color:#fff;padding:34px 30px 32px}
.home-hero .pattern{position:absolute;inset:0;opacity:.12;pointer-events:none}
.home-hero > *{position:relative}
.home-hero .kicker{font-size:14px;font-weight:500;opacity:.85}
.home-hero h1{font-size:clamp(30px,5.4vw,46px);font-weight:700;line-height:1.08;letter-spacing:-.025em;margin-top:10px;max-width:15ch}
.home-hero p{margin:14px 0 0;max-width:52ch;opacity:.92;font-size:17px}
.sec-title{font-size:21px;font-weight:700;margin:40px 0 14px}
.subj-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px}
.subj{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;text-align:left;cursor:pointer;display:flex;flex-direction:column;gap:6px;min-width:0;position:relative;overflow:hidden}
.subj::before{content:"";position:absolute;inset:0 0 auto;height:4px;background:var(--accent)}
.subj:hover{border-color:var(--accent)}
.subj .sn-ic{width:40px;height:40px;font-size:15px;border-radius:10px;margin-bottom:6px}
.subj h3{font-size:18px;font-weight:600}
.subj .meta{font-size:14px;color:var(--muted)}
.soon-list{display:flex;flex-wrap:wrap;gap:8px}
.soon-list span{border:1px dashed var(--line-2);border-radius:999px;padding:5px 12px;font-size:14px;color:var(--muted)}
.how{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px 24px;margin:0;padding:0;list-style:none}
.how li{border-top:2px solid var(--navy);padding-top:10px}
.how b{display:block;font-size:16px;margin-bottom:2px}
.how span{color:var(--muted);font-size:15px}

/* subject page */
.page-h{margin-top:14px}
.page-h h1{font-size:clamp(28px,5vw,40px);font-weight:700;line-height:1.1;letter-spacing:-.02em}
.page-h p{color:var(--muted);margin:10px 0 0;max-width:62ch}
.facts{display:flex;gap:6px 18px;flex-wrap:wrap;margin-top:14px;font-size:15px;color:var(--muted)}
.fact b{color:var(--navy);font-weight:600}
.progress{margin-top:14px;display:flex;align-items:center;gap:12px;font-size:14px;color:var(--muted)}
.progress .track{flex:1;height:6px;background:var(--line);border-radius:999px;overflow:hidden;max-width:240px}
.progress .fill{height:100%;background:var(--accent)}
.seg{display:flex;gap:4px;margin-top:24px;border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
.seg button{border:0;background:none;padding:10px 14px;font-weight:600;font-size:15px;cursor:pointer;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px;white-space:nowrap}
.seg button:hover{color:var(--navy)}
.seg button[aria-pressed="true"]{color:var(--accent);border-bottom-color:var(--accent)}
.lead-note{color:var(--muted);margin-top:18px;font-size:15px}
.sec{margin-top:30px}
.sec-head{display:flex;gap:10px;align-items:baseline;padding-bottom:8px;border-bottom:2px solid var(--navy)}
.sec-head .num{font-size:14px;color:var(--accent);font-weight:700}
.sec-head h2{font-size:18px;font-weight:600}
.topic-row{display:grid;grid-template-columns:34px 1fr auto;gap:10px;align-items:center;padding:12px 4px;border:0;border-bottom:1px solid var(--line);cursor:pointer;background:none;width:100%;text-align:left}
.topic-row:hover .t-title{color:var(--accent)}
.t-num{color:var(--faint);font-size:14px;font-weight:600}
.t-title{font-weight:500;min-width:0}
.pill{font-size:12.5px;font-weight:600;padding:3px 10px;border-radius:999px;white-space:nowrap}
.pill.ready{background:var(--green-soft);color:var(--green-ink)}
.pill.soon{background:var(--line);color:var(--muted)}
.pill.weak{background:var(--orange-soft);color:var(--orange)}
.pill.ex{background:var(--blue-soft);color:var(--blue)}

/* ---------- topic page ---------- */
.topic-head{margin-top:16px;padding-bottom:22px;border-bottom:1px solid var(--line)}
.topic-head .tnum{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.topic-head .big{font-size:15px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:8px;padding:2px 10px}
.code{font-size:13px;color:var(--muted);font-weight:500}
.topic-head h1{font-size:clamp(28px,4.6vw,40px);font-weight:700;line-height:1.12;letter-spacing:-.022em;margin-top:12px}
.spec{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.spec span{font-size:14px;background:var(--panel);border-radius:8px;padding:4px 10px;color:var(--muted)}
.spec-h{font-size:14px;color:var(--faint);margin-top:18px}
.block{margin-top:40px}
.block > h2{font-size:23px;font-weight:700;line-height:1.25;margin-bottom:14px;letter-spacing:-.015em}
.gist{background:var(--blue);color:#fff;border-radius:16px;padding:22px 24px;font-size:18px;line-height:1.6;margin-top:28px}
.gist h2{font-size:15px;font-weight:600;opacity:.8;margin-bottom:6px;letter-spacing:0}
.rail{list-style:none;margin:0;padding:0;position:relative}
.rail::before{content:"";position:absolute;left:113px;top:10px;bottom:10px;width:2px;background:var(--line)}
.rail li{display:grid;grid-template-columns:96px 1fr;gap:38px;padding:7px 0;position:relative}
.rail li::after{content:"";position:absolute;left:108px;top:15px;width:12px;height:12px;border-radius:50%;background:#fff;border:3px solid var(--accent)}
.rail .d{font-weight:700;text-align:right;color:var(--accent);font-size:15px;line-height:1.55}
.rail .tx{min-width:0}
.formulas{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.formula{background:var(--panel);border-radius:12px;padding:14px 16px;min-width:0;overflow-x:auto}
.formula .f{font-weight:600;font-size:17px;line-height:1.5;overflow-wrap:anywhere}
.formula .ft{font-size:14.5px;color:var(--muted);margin-top:4px}
figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px;min-width:0;max-width:100%}
figure + figure{margin-top:12px}
.fig-scroll{overflow-x:auto}
.fig-scroll svg{display:block;width:100%;height:auto;max-width:540px;margin:0 auto;color:var(--navy);font-family:var(--font)}
figcaption{font-size:14.5px;color:var(--muted);margin-top:10px;max-width:68ch;line-height:1.55}
.tbl{overflow-x:auto;max-width:100%}
table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:460px}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:13px;color:var(--muted);font-weight:600}
.terms{margin:0;display:grid;grid-template-columns:minmax(120px,30%) 1fr;border-top:1px solid var(--line)}
.terms dt,.terms dd{margin:0;padding:11px 0;border-bottom:1px solid var(--line)}
.terms dt{font-weight:600;padding-right:18px}
.terms dd{color:#33424E}
@media (max-width:560px){.terms{grid-template-columns:1fr}.terms dt{border-bottom:0;padding-bottom:0}.terms dd{padding-top:2px}}
.prose h3{font-size:19px;font-weight:600;margin-top:26px}
.prose h3:first-of-type{margin-top:0}
.prose p{margin:8px 0 0;max-width:68ch}
.ex-list{display:grid;gap:16px}
.ex{border:1px solid var(--line);border-radius:14px;padding:18px 20px;min-width:0}
.ex .ex-q{font-weight:600}
.ex .ex-q .tag{display:inline-block;font-size:13px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:6px;padding:1px 8px;margin-right:8px;vertical-align:1px}
.ex ol{margin:12px 0 0;padding-left:22px;display:grid;gap:6px}
.ex li{min-width:0;overflow-x:auto}
.ex li::marker{color:var(--accent);font-weight:700}
.ex .ans{margin-top:14px;display:inline-flex;gap:8px;align-items:baseline;flex-wrap:wrap;background:var(--green-soft);border-radius:10px;padding:8px 12px}
.ex .ans b{color:var(--green-ink);font-size:14px}
.traps{border-left:4px solid var(--orange);background:var(--orange-soft);border-radius:0 12px 12px 0;padding:14px 18px}
.traps ul{margin:0;padding-left:18px;display:grid;gap:8px}
.traps li::marker{color:var(--orange)}
.memo{font-size:19px;font-weight:600;line-height:1.5}
.memo mark{background:linear-gradient(transparent 55%,var(--yellow) 55%);color:inherit;padding:0 .1em;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.quiz{display:grid;gap:14px}
.q{border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.q p{margin:0 0 10px;font-weight:600}
.opts{display:grid;gap:8px}
.opt{text-align:left;border:1px solid var(--line-2);background:#fff;border-radius:10px;padding:10px 14px;cursor:pointer}
.opt:hover:not(:disabled){border-color:var(--blue);background:var(--blue-soft)}
.opt.right{background:var(--green-soft);border-color:var(--green-ink);color:var(--green-ink);font-weight:600}
.opt.wrong{background:var(--orange-soft);border-color:var(--orange);color:var(--orange)}
.opt:disabled{cursor:default}
.expl{margin-top:10px;font-size:15px;color:var(--muted)}
.score{font-weight:600}
.cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.btn{border:0;border-radius:10px;padding:11px 18px;font-weight:600;cursor:pointer;background:var(--orange);color:#fff}
.btn:hover{filter:brightness(.95)}
.btn.ghost{background:#fff;color:var(--navy);border:1px solid var(--line-2)}
.btn.small{padding:7px 12px;font-size:14px}
.related{display:flex;gap:8px;flex-wrap:wrap}
.chip-link{border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:6px 14px;cursor:pointer;font-size:14.5px;text-align:left}
.chip-link:hover{border-color:var(--accent);color:var(--accent)}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:48px}
.pager .btn{min-width:0;text-align:left;padding:14px 16px;font-weight:600;line-height:1.35}
.pager .btn.nx{text-align:right;grid-column:2}
.pager small{display:block;font-weight:500;color:var(--muted);font-size:13px;margin-bottom:3px}
@media (max-width:560px){.pager{grid-template-columns:1fr}.pager .btn.nx{grid-column:1}}
.note{margin-top:14px;font-size:15px;background:var(--blue-soft);border-radius:10px;padding:10px 14px}
.era{margin-top:28px}
.era h2{font-size:19px;font-weight:700;margin-bottom:10px}
.tl-item{border:0;background:none;width:100%;text-align:left;cursor:pointer;padding:0}
.tl-item:hover{color:var(--accent)}
.fx-topic{margin-top:28px}
.fx-topic h2{font-size:18px;font-weight:600;margin-bottom:10px}
.fx-topic h2 button{border:0;background:none;padding:0;cursor:pointer;color:inherit;text-align:left;font:inherit}
.fx-topic h2 button:hover{color:var(--accent)}
.demo-flag{display:inline-block;font-size:13px;font-weight:600;background:var(--blue-soft);color:var(--blue);padding:3px 10px;border-radius:999px}
.weak-subj{margin-top:32px}
.weak-subj > h2{font-size:21px;font-weight:700;margin-bottom:4px}
.weak-sub{margin-top:14px}
.weak-sub h3{font-size:14px;font-weight:600;color:var(--muted);margin-bottom:4px}
.check{width:20px;height:20px;accent-color:var(--blue)}
.weak-row{display:grid;grid-template-columns:24px 1fr auto;gap:12px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
.weak-row button{border:0;background:none;text-align:left;padding:0;cursor:pointer;font-weight:500;min-width:0}
.weak-row button:hover{color:var(--accent)}
.weak-row.done button{color:var(--muted);text-decoration:line-through}

/* in-page contents */
.toc{padding:36px 18px 40px 6px}
.toc-in{position:sticky;top:calc(var(--top) + 36px);font-size:14px;line-height:1.35}
.toc-in p{margin:0 0 8px;color:var(--faint);font-size:13px}
.toc-in button{display:block;width:100%;text-align:left;border:0;background:none;padding:5px 0 5px 12px;border-left:2px solid var(--line);color:var(--muted);cursor:pointer}
.toc-in button:hover{color:var(--navy)}
.toc-in button[aria-current="true"]{border-left-color:var(--accent);color:var(--navy);font-weight:600}

/* ---------- interactive widgets ---------- */
.widgets{display:grid;gap:16px}
.wg{background:#fff;border:1.5px solid var(--blue);border-radius:14px;padding:16px 18px;min-width:0}
.wg-h{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.wg-h h3{font-size:17px;font-weight:600}
.wg-h .tag{font-size:12px;font-weight:600;background:var(--green);color:var(--navy);border-radius:6px;padding:1px 8px}
.wg-hint{font-size:14.5px;color:var(--muted);margin:0 0 10px}
.wg .pic svg{display:block;width:100%;height:auto;max-width:560px;margin:0 auto}
.ctrls{display:grid;gap:10px;margin-top:12px}
.ctrl{display:grid;grid-template-columns:minmax(70px,auto) 1fr 64px;gap:10px;align-items:center;font-size:14.5px}
.ctrl label{font-weight:600}
.ctrl output{font-variant-numeric:tabular-nums;text-align:right;font-weight:600;color:var(--blue)}
input[type=range]{width:100%;accent-color:var(--blue)}
.readout{margin-top:12px;background:var(--panel);border-radius:10px;padding:10px 12px;font-size:15px;overflow-x:auto}
.readout .row{display:flex;justify-content:space-between;gap:12px;padding:3px 0;border-bottom:1px dashed var(--line-2)}
.readout .row:last-child{border-bottom:0}
.readout .row b{font-variant-numeric:tabular-nums}
.readout .katex{font-size:1.12em}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:6px 12px;font-size:14px;font-weight:600;cursor:pointer}
.chip[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:#fff}
.field{width:100%;padding:10px 12px;border:1px solid var(--line-2);border-radius:10px;background:#fff;font-size:16px}
.ok{color:var(--green-ink);font-weight:600}
.bad{color:var(--orange);font-weight:600}
.flash{border-radius:12px;background:var(--blue);color:#fff;min-height:130px;display:grid;place-items:center;text-align:center;padding:18px;cursor:pointer;font-size:18px;font-weight:600}
.flash.back{background:var(--navy)}
.flash small{display:block;font-size:13px;opacity:.75;font-weight:500;margin-bottom:6px}
.order-list{display:grid;gap:8px;margin:0;padding:0;list-style:none}
.order-list li{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:8px 10px}
.order-list li.good{border-color:var(--green-ink);background:var(--green-soft)}
.order-list li.wrongpos{border-color:var(--orange);background:var(--orange-soft)}
.order-list .mv{display:flex;gap:4px}
.order-list .mv button{border:1px solid var(--line-2);background:#fff;border-radius:8px;width:34px;height:34px;cursor:pointer;font-weight:700}
.match{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.match button{border:1px solid var(--line-2);background:#fff;border-radius:10px;padding:10px 12px;text-align:left;cursor:pointer;font-size:14.5px;min-width:0}
.match button.sel{border-color:var(--blue);background:var(--blue-soft)}
.match button.done{border-color:var(--green-ink);background:var(--green-soft);color:var(--green-ink);cursor:default}
.match button.no{border-color:var(--orange);background:var(--orange-soft)}
.ptable{display:grid;grid-template-columns:repeat(18,minmax(0,1fr));gap:2px;overflow-x:auto;min-width:520px}
.ptable button{aspect-ratio:1;border:1px solid var(--line);background:#fff;border-radius:4px;font-size:11px;font-weight:700;padding:0;cursor:pointer;color:var(--navy)}
.ptable button.m{background:#EEF0FF}.ptable button.n{background:#E3FFF1}.ptable button.g{background:#FFF7D6}
.ptable button[aria-pressed="true"]{outline:2px solid var(--orange);outline-offset:-1px}
.pt-scroll{overflow-x:auto}
.mapinfo{margin-top:10px;background:var(--panel);border-radius:10px;padding:12px}
.mapinfo h4{margin:0 0 4px;font-size:16px}

@media (max-width:480px){
  main{padding-top:22px}
  .rail::before{left:79px}.rail li{grid-template-columns:66px 1fr;gap:28px}.rail li::after{left:74px}.rail .d{font-size:13.5px}
  .ctrl{grid-template-columns:56px 1fr 54px}
  .home-hero{padding:26px 20px;border-radius:14px}
  .gist{padding:18px;font-size:17px}
  .block > h2{font-size:21px}
}
@media (prefers-reduced-motion:reduce){.side,.sn-chev{transition:none}}
.tbl,.fig-scroll,.pt-scroll,.readout,.formula,.katex-display,.ex li,figure{position:relative}
[hidden]{display:none!important}

.simple-lead{font-size:17px;margin:0 0 12px}
.simple{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.simple .sc{background:#FFF8E6;border:1px solid #F5E2B0;border-radius:14px;padding:14px 16px;min-width:0}
.simple .sc h3{font-size:16px;margin:0 0 6px}
.simple .sc p{margin:6px 0 0;overflow-x:auto}
.gtag{display:inline-block;font-size:12px;font-weight:600;color:var(--muted,#56606F);background:var(--panel,#F4F5FD);border-radius:6px;padding:1px 8px;vertical-align:2px;margin-left:6px}
.note.extra{background:#FFF1D6;color:#7A4A00}
.hard-list{display:grid;gap:16px}
.hard{border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:14px;padding:18px 20px;min-width:0}
.hard .ex-q{font-weight:600}
.hard .ex-q .tag{display:inline-block;font-size:13px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:6px;padding:1px 8px;margin-right:8px;vertical-align:1px}
.hard .idea{margin:10px 0 0;color:var(--muted,#56606F)}
.hsteps{margin:14px 0 0;padding-left:24px;display:grid;gap:12px}
.hsteps li{min-width:0}
.hsteps li::marker{color:var(--accent);font-weight:700}
.hsteps li b{display:block;margin-bottom:4px}
.hsteps li div{overflow-x:auto;overflow-y:hidden;padding:2px 0}
.hard .ans{margin-top:14px;display:inline-flex;gap:8px;align-items:baseline;flex-wrap:wrap;background:var(--green-soft);border-radius:10px;padding:8px 12px}
.hard .ans b{color:var(--green-ink);font-size:14px}
.hard .ans[hidden]{display:none}
.hctl{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.entb{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.02em;line-height:1;padding:3px 6px;border-radius:6px;background:#FFE8B8;color:#8A5300;vertical-align:1px;white-space:nowrap}
.rail li.ent .d{color:#8A5300}
.kx{display:block;color:var(--muted);font-size:13px;margin-top:3px}
.dfilt{margin:4px 0 14px}
.dates.only-ent li:not(.ent),.dates.only-ent .era.noent{display:none}
.entd{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}
.entd .ed{border:1px solid #F1D9A6;background:#FFFBF2;border-radius:12px;padding:12px 14px}
.entd .ed-h{display:flex;gap:8px;align-items:center;margin-bottom:6px;flex-wrap:wrap}
.entd .ed-h .d{font-weight:700;color:#8A5300;font-size:14px}
.entd .ed b{display:block;font-size:15px;line-height:1.35}
.entd .ed p{margin:6px 0 0;font-size:14px;line-height:1.5;color:var(--ink,#222)}

/* ================= minimal redesign (v11) =================
   One accent colour, white surfaces, hairline borders, no icon badges. */
:root{--blue:#2F3BD6;--blue-soft:#F1F2FD;--panel:#F7F7F9;--line:#ECECF1;--line-2:#DCDDE5;--muted:#5E6573;--faint:#9097A3;--navy:#111827}
[data-subj]{--accent:#2F3BD6;--accent-soft:#F1F2FD}
body{font-size:17px}
body::before{background:#fff}
.top{background:#fff;color:var(--navy);border-bottom:1px solid var(--line)}
.logo{color:var(--navy)}
.logo svg{height:22px;color:var(--blue)}
.logo span{border-left-color:var(--line-2);color:var(--muted);opacity:1;font-weight:400}
.menu-btn{color:var(--navy)}.menu-btn:hover{background:var(--panel)}
.lang{background:var(--panel)}
.lang button{color:var(--muted)}
.lang button[aria-pressed="true"]{background:#fff;color:var(--navy);box-shadow:0 0 0 1px var(--line-2)}
/* sidebar */
.side{background:#fff}
.sn-head{grid-template-columns:1fr auto 16px}
.sn-ic{display:none}
.sn-name{font-weight:500}
.nav-link:hover,.sn-head:hover,.sn-t:hover{background:var(--panel)}
.nav-link[aria-current="true"]{background:var(--panel);box-shadow:none}
.nav-link .cnt{background:none;color:var(--faint);font-weight:500}
.sn-body{border-left:1px solid var(--line);margin-left:12px}
.sn-links button[aria-current="true"]{background:var(--navy);border-color:var(--navy)}
.sn-t[aria-current="true"]{background:var(--panel);color:var(--navy);font-weight:600;box-shadow:inset 2px 0 0 var(--accent)}
.sn-t[aria-current="true"] .n{color:var(--faint)}
.sn-t[aria-current="true"] .dot{background:var(--orange)}
.sn-t .dot.weak{background:#E8A08E}
/* home */
.home-hero{background:none;color:var(--navy);padding:24px 0 8px;border-radius:0}
.home-hero .kicker{color:var(--faint);opacity:1;font-size:14px}
.home-hero h1{font-size:clamp(32px,5vw,44px);max-width:18ch}
.home-hero p{color:var(--muted);opacity:1;max-width:56ch}
.sec-title{font-size:15px;font-weight:600;color:var(--faint);margin:40px 0 4px;letter-spacing:0}
.subj-list{border-top:1px solid var(--line)}
.subj{display:grid;grid-template-columns:1fr auto 16px;gap:14px;align-items:center;width:100%;background:none;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:18px 4px;cursor:pointer;text-align:left}
.subj::before{display:none}
.subj:hover .subj-name{color:var(--accent)}
.subj-name{font-size:20px;font-weight:600;letter-spacing:-.01em}
.subj .meta{font-size:14px;color:var(--faint)}
.subj .sn-chev{color:var(--faint)}
.soon-line{margin-top:24px;font-size:14px;color:var(--faint)}
/* subject + topic */
.sec-head{border-bottom:1px solid var(--line)}
.sec-head .num{color:var(--faint)}
.topic-head .big{background:none;padding:0;color:var(--faint);font-weight:600;font-size:14px}
.code{color:var(--faint)}
.spec span{background:none;border:1px solid var(--line);color:var(--muted)}
.gist{background:var(--panel);color:var(--navy);border-radius:12px;box-shadow:inset 3px 0 0 var(--accent);font-size:18px}
.gist h2{opacity:1;color:var(--faint);font-weight:600}
.block > h2{font-size:22px}
.rail li::after{border-width:2px;width:10px;height:10px;top:16px;left:109px}
.rail li.ent .d,.entd .ed-h .d{color:var(--navy)}
.entb{background:var(--panel);color:var(--navy);border:1px solid var(--line-2);font-weight:600}
.formula{background:#fff;border:1px solid var(--line)}
.simple .sc{background:#fff;border:1px solid var(--line)}
.entd .ed{background:#fff;border-color:var(--line)}
.ex,.hard,.q{border-color:var(--line)}
.hard{border-left:1px solid var(--line);box-shadow:inset 3px 0 0 var(--accent)}
.ex .ex-q .tag,.hard .ex-q .tag{background:none;padding:0;color:var(--faint)}
.ex .ans,.hard .ans{background:var(--panel)}
.ex .ans b,.hard .ans b{color:var(--navy)}
.traps{background:#fff;border:1px solid var(--line);border-left:3px solid var(--orange);border-radius:12px}
.memo mark{background:linear-gradient(transparent 60%,#FFF0A0 60%)}
.note{background:var(--panel)}
.note.extra{background:var(--panel);color:var(--muted)}
.wg{border:1px solid var(--line-2)}
.wg-h .tag{background:var(--panel);color:var(--muted)}
.btn{background:var(--navy)}
.btn.ghost{background:#fff;color:var(--navy)}
.chip[aria-pressed="true"]{background:var(--navy);border-color:var(--navy)}
.flash{background:var(--blue)}
.pill.weak{background:none;color:var(--orange);border:1px solid #F5C7BA}
.seg button[aria-pressed="true"]{color:var(--navy);border-bottom-color:var(--navy)}
.progress .fill{background:var(--navy)}
.sn-t .n{font-weight:500}
@media (max-width:480px){.home-hero{padding:8px 0 0}.subj-name{font-size:18px}}
.wg-h .tag{display:none}
/* feedback */
.foot{display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between;align-items:center}
.fb-link{border:0;background:none;padding:0;font:inherit;font-size:13px;color:var(--muted);text-decoration:underline;text-underline-offset:3px;cursor:pointer}
.fb-link:hover{color:var(--accent)}
.fb-box{margin-top:40px;padding:16px 18px;border:1px dashed var(--line-2);border-radius:14px;background:var(--panel);display:flex;gap:12px 18px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.fb-box p{margin:0;font-size:15px;color:var(--muted);flex:1 1 320px;line-height:1.5}
.fb-box .btn{flex:0 0 auto}
.fb-dlg{border:0;border-radius:18px;padding:0;width:min(560px,calc(100vw - 32px));max-height:calc(100vh - 32px);box-shadow:0 20px 60px rgba(17,24,39,.25);color:var(--navy)}
.fb-dlg::backdrop{background:rgba(17,24,39,.45)}
.fb-f{padding:20px 22px 22px;display:flex;flex-direction:column;gap:12px}
.fb-hd{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.fb-hd h2{margin:0;font-size:20px;line-height:1.3}
.fb-x{border:0;background:var(--panel);width:34px;height:34px;border-radius:50%;font-size:22px;line-height:1;cursor:pointer;color:var(--muted);flex:0 0 auto}
.fb-lead{margin:0;color:var(--muted);font-size:14.5px;line-height:1.5}
.fb-where{margin:0;font-size:14px;background:var(--panel);border-radius:10px;padding:8px 12px;line-height:1.45}
.fb-l{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}
.fb-l small{font-weight:400;color:var(--faint)}
.fb-l textarea,.fb-l input{font:inherit;font-size:15px;font-weight:400;border:1px solid var(--line-2);border-radius:10px;padding:9px 12px;resize:vertical;color:var(--navy);background:#fff;width:100%;box-sizing:border-box}
.fb-l textarea:focus,.fb-l input:focus{outline:2px solid var(--accent);outline-offset:0;border-color:transparent}
.fb-hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.fb-st{margin:0;font-size:14px;min-height:1px}.fb-st.good{color:#1F7A4D;font-weight:600}.fb-st.bad{color:#C2412D}
.fb-act{display:flex;gap:10px;flex-wrap:wrap}
/* informatics: code */
.qq{margin:0 0 10px;font-weight:600}
code.ic{font-family:var(--mono,"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace);font-size:.88em;background:#F1F2F8;border:1px solid var(--line);border-radius:6px;padding:.05em .35em;white-space:pre-wrap;font-weight:500}
.cblk{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:14px;line-height:1.5;background:#0F172A;color:#E2E8F0;border-radius:12px;padding:12px 14px;margin:10px 0;overflow-x:auto;tab-size:4;font-weight:400;text-align:left}
.cblk code{font:inherit;white-space:pre}
.pblk{margin:0 0 14px}
.hk{color:#C792EA}.hb{color:#82AAFF}.hs{color:#C3E88D}.hn{color:#F78C6C}.hc{color:#7F8BA3;font-style:italic}
.ce{position:relative;border-radius:12px;background:#0F172A;overflow:hidden;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:14px;line-height:1.5}
.ce-hl,.ce-ta{margin:0;border:0;padding:.55em .8em .55em 3.2em;font:inherit;line-height:inherit;tab-size:4;white-space:pre;overflow:auto;box-sizing:border-box;width:100%}
.ce-hl{position:absolute;inset:0;color:#E2E8F0;pointer-events:none;overflow:hidden}
.ce-hl code{font:inherit}
.ce-ta{position:relative;display:block;background:transparent;color:transparent;caret-color:#fff;resize:none;outline:none;-webkit-text-fill-color:transparent}
.ce-ta::selection{background:rgba(130,170,255,.35);-webkit-text-fill-color:transparent}
.ce:focus-within{box-shadow:0 0 0 2px var(--accent)}
.ce-ln{position:absolute;left:0;top:0;bottom:0;width:2.5em;padding:.55em 0;text-align:right;color:#55607A;font-size:.85em;line-height:1.765;overflow:hidden;pointer-events:none;user-select:none}
.ce-ln{line-height:calc(1.5em / .85);padding:calc(.55em / .85) 0}
.pr-ask{font-weight:600;margin:12px 0 8px}
.pr-in{margin-top:10px;font-size:14px}.pr-in summary{cursor:pointer;color:var(--muted)}
.pr-in textarea,.pr-guess textarea{width:100%;box-sizing:border-box;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;border:1px solid var(--line-2);border-radius:10px;padding:8px 10px;margin-top:6px;resize:vertical}
.pr-guess{margin-top:12px}.pr-guess label{font-size:14px;font-weight:600;display:block}
.pr-act{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.pr-out{margin-top:12px}
.pr-term{border:1px solid var(--line-2);border-radius:12px;overflow:hidden;background:#fff}
.pr-term-h{font-size:12px;font-weight:600;color:var(--muted);background:var(--panel);padding:5px 12px;border-bottom:1px solid var(--line)}
.pr-term pre{margin:0;padding:10px 12px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;line-height:1.5;white-space:pre-wrap;word-break:break-word;max-height:340px;overflow:auto}
.pr-err{color:#C2412D;display:block}.pr-empty{color:var(--faint)}
.pr-status{color:var(--muted);font-size:14px;margin:0}
.pr-verdict{font-weight:600;margin:0 0 8px;font-size:15px}.pr-verdict.good{color:#1F7A4D}.pr-verdict.bad{color:#C2412D}
.sq-schema{margin-bottom:10px;font-size:14px}.sq-schema summary{cursor:pointer;color:var(--muted)}
.sq-tn{font-family:ui-monospace,Menlo,Consolas,monospace;font-weight:700;margin:12px 0 4px;font-size:13px}
.sq-tw{overflow-x:auto;border:1px solid var(--line-2);border-radius:10px}
.sq-t{border-collapse:collapse;font-size:13.5px;width:100%;background:#fff}
.sq-t th,.sq-t td{padding:5px 10px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}
.sq-t th{background:var(--panel);font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12.5px}
.sq-t tr:last-child td{border-bottom:0}
.sq-cnt{font-size:14px;margin:0 0 6px;color:var(--muted)}
.hr-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}
@media (max-width:760px){.hr-grid{grid-template-columns:1fr}}
.hr-pv{border:1px solid var(--line-2);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;min-height:260px;background:#fff}
.hr-bar{display:flex;align-items:center;gap:5px;padding:6px 10px;background:var(--panel);border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}
.hr-bar i{width:9px;height:9px;border-radius:50%;background:#D3D7EA;display:inline-block}.hr-bar span{margin-left:6px}
.hr-pv iframe{border:0;width:100%;flex:1;min-height:260px;background:#fff}
/* informatics widgets */
.ns-in{display:flex;flex-wrap:wrap;gap:8px 10px;align-items:center}
.ns-in input,.lg-in input,.if-grid input{font:inherit;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:16px;border:1px solid var(--line-2);border-radius:10px;padding:8px 12px;background:#fff;color:var(--navy);box-sizing:border-box}
.ns-in input{width:9em}.ns-in .chips{margin:0}
.ns-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:12px 0}
@media (max-width:560px){.ns-grid{grid-template-columns:1fr 1fr}}
.ns-c{border:1px solid var(--line-2);border-radius:12px;padding:8px 10px;background:#fff;min-width:0}.ns-c.cur{border-color:var(--accent);background:var(--accent-soft)}
.ns-c span{display:block;font-size:12px;color:var(--muted)}.ns-c b{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:17px;word-break:break-all}
.ns-steps p{margin:6px 0;font-size:15px}.ns-f{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14.5px;background:var(--panel);border-radius:10px;padding:8px 12px;overflow-x:auto;white-space:nowrap}
.ns-t{width:auto;border-collapse:collapse;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;margin:4px 0}.ns-t td{padding:2px 10px 2px 0}
.ns-err{color:#C2412D;font-size:14.5px}
.ns-bt{font-weight:600;margin:16px 0 6px;font-size:15px}
.ns-bits{display:grid;grid-template-columns:repeat(8,1fr);gap:4px;max-width:520px}
.bit{border:1px solid var(--line-2);background:#fff;border-radius:10px;padding:6px 0;cursor:pointer;display:flex;flex-direction:column;align-items:center;font:inherit}
.bit b{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:20px}.bit small{font-size:10.5px;color:var(--faint)}
.bit.on{background:var(--accent);border-color:var(--accent);color:#fff}.bit.on small{color:rgba(255,255,255,.8)}
.ns-bo p{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;margin:8px 0 0}
.lg-in input{width:100%;font-size:17px}.lg-keys{margin:8px 0}.lg-keys .chip{font-size:16px;min-width:38px}
.lg-tw{max-width:420px;margin:10px 0}.lg-t td,.lg-t th{text-align:center;font-family:ui-monospace,Menlo,Consolas,monospace}.lg-t tr.t1 td{background:#E9F7EF}
.if-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px;margin:10px 0}
.if-grid label{display:flex;flex-direction:column;gap:4px;font-size:13.5px;font-weight:600;color:var(--muted)}.if-grid input{width:100%}
.ip-b{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13.5px;background:var(--panel);border-radius:12px;padding:10px 12px;margin:10px 0;overflow-x:auto}
.ip-b>div{display:grid;grid-template-columns:4.5em auto auto;gap:12px;align-items:center;white-space:nowrap;padding:2px 0}
.ip-b>div span{color:var(--muted);font-family:var(--font);font-size:13px}.ip-b>div.and{border-top:1px dashed var(--line-2);margin-top:2px}
.ip-b code{font:inherit}.ip-b .nb{color:#2F3BD6;font-weight:700}.ip-b .hb2{color:#E2603A}
.sv-bars{display:flex;gap:6px;align-items:flex-end;height:140px;margin:14px 0 6px;max-width:460px}
.sv-b{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:3px}
.sv-b i{display:block;width:100%;background:#C9CFF4;border-radius:6px 6px 2px 2px;transition:height .25s}.sv-b b{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px}
.sv-b.hl i{background:#E2603A}.sv-b.ok i{background:#2E9E6A}
.sv-msg{min-height:1.5em;font-size:15px;margin:6px 0}
.gv-sel{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:15px}.gv-sel select{font:inherit;padding:4px 8px;border-radius:8px;border:1px solid var(--line-2);background:#fff}
.gv{width:100%;max-width:520px;height:auto;display:block;margin:8px 0}
.gv-tab .sq-t td,.gv-tab .sq-t th{text-align:center}
.sr-t{border-collapse:collapse;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;margin:8px 0;width:100%;max-width:560px;table-layout:fixed}
.sr-t th{background:var(--panel);color:var(--muted);font-weight:600;border:1px solid var(--line);padding:3px;width:auto}.sr-t tr th:first-child{width:28px}
.sr-t td{border:1px solid var(--line);height:28px;padding:2px 4px;cursor:pointer;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;background:#fff}
.sr-t td:hover{background:var(--accent-soft)}.sr-t td.src{background:#EEF0FF;font-weight:700;color:#2F3BD6}.sr-t td.tgt{background:#FDE7DF;font-weight:700;color:#B4421F;box-shadow:inset 0 0 0 2px #E2603A}
.rgb-w{display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:center}.rgb-sw{height:120px;border-radius:16px;border:1px solid var(--line-2)}
@media (max-width:480px){.rgb-w{grid-template-columns:1fr}}
.fm-files{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0}
.fm{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13.5px;border:1px solid var(--line-2);border-radius:8px;padding:3px 9px;background:#fff;color:var(--faint)}
.fm.on{background:#E9F7EF;border-color:#2E9E6A;color:#1F6E47;font-weight:700}
.ns-t,.sr-t,.sq-t,.lg-t{min-width:0}
.sr-grid{overflow-x:auto}
code.ic{word-break:break-all}
.hr-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
@media (max-width:760px){.hr-grid{grid-template-columns:minmax(0,1fr)}}
.ans span{overflow-wrap:anywhere}
.ans span{overflow-wrap:anywhere;min-width:0}
/* practice tasks */
.pt-head{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center;justify-content:space-between}
.pt-head .chips{margin:0}.pt-prog{font-size:13.5px;color:var(--muted);font-weight:600}
.pt-chip{display:inline-flex;align-items:center;gap:5px}.pt-chip i{font-style:normal;color:#fff;font-size:10.5px;font-weight:700;border-radius:4px;padding:0 4px;line-height:15px}
.pt-chip.done{border-color:#2E9E6A}
.pt-task{margin:12px 0 8px}.pt-task h4{margin:0 0 6px;font-size:16.5px}.pt-lv{font-size:12.5px;font-weight:700;margin-left:6px}
.pt-st{font-size:15.5px;line-height:1.6}.pt-st p{margin:0 0 6px}
.pt-out{margin-top:12px}.pt-h{background:#FFF7E6;border-radius:10px;padding:10px 12px;margin:0;font-size:15px}
.pt-tests{display:flex;gap:5px;margin:0 0 10px}.pt-t{width:26px;height:26px;border-radius:7px;background:#E3F4EA;color:#1F7A4D;font-weight:700;font-size:13px;display:grid;place-items:center}
.pt-verdict.bad~.pt-tests .pt-t{background:#E3F4EA}.pt-t.bad{background:#FDE7DF;color:#C2412D}
.pt-diff{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
@media (max-width:640px){.pt-diff{grid-template-columns:minmax(0,1fr)}}
.pt-diff>div{border:1px solid var(--line-2);border-radius:10px;overflow:hidden;background:#fff}
.pt-diff span{display:block;font-size:12px;font-weight:600;color:var(--muted);background:var(--panel);padding:4px 10px;border-bottom:1px solid var(--line)}
.pt-diff pre{margin:0;padding:8px 10px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13.5px;white-space:pre-wrap;word-break:break-word;max-height:220px;overflow:auto}
.pt-next{margin-top:10px}
.cb-bar{display:flex;gap:6px;flex-wrap:wrap;margin:-4px 0 10px}
.cb-btn{border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:3px 12px;font:inherit;font-size:13px;font-weight:600;cursor:pointer;color:var(--navy)}
.cb-btn:hover{border-color:var(--accent);color:var(--accent)}
.cb-out:empty{display:none}.cb-out{margin:0 0 12px}

/* ---------- маршрут по слабым темам (связь с ent.ustudy.kz) ---------- */
a.btn{display:inline-flex;align-items:center;text-decoration:none}
.btn.sm{padding:7px 12px;font-size:14px;border-radius:8px}
.ent-cta{margin-top:18px;padding:22px 22px 20px;border-radius:16px;background:linear-gradient(135deg,var(--blue) 0%,#5560F0 100%);color:#fff}
.ent-cta h1,.ent-cta h2{font-size:clamp(22px,4vw,30px);line-height:1.15;color:#fff}
.ent-cta p{margin:8px 0 0;max-width:60ch;color:rgba(255,255,255,.88)}
.ent-cta .cta{margin-top:16px;display:flex;flex-wrap:wrap;gap:10px}
.ent-cta .btn{background:#fff;color:var(--blue)}
.ent-cta .btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.route .page-h p{max-width:70ch}
.route-subj{margin-top:28px}
.rs-h{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;padding-bottom:10px;border-bottom:2px solid var(--accent)}
.rs-h h2{font-size:22px;margin-right:auto}
.rs-last{font-size:14px;color:var(--muted)}
.route-subj>h3{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:18px 0 6px}
.rt-list{list-style:none;margin:0;padding:0}
.rt-item{display:grid;grid-template-columns:34px 1fr;gap:12px;padding:14px 0;border-bottom:1px solid var(--line);position:relative}
.rt-num{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:14px;background:var(--accent-soft);color:var(--accent)}
.rt-item.st-done .rt-num{background:var(--green-soft);color:var(--green-ink)}
.rt-item.st-again .rt-num{background:var(--orange-soft);color:var(--orange)}
.rt-title{font-weight:600;line-height:1.35}
.rt-item.st-done .rt-title{color:var(--muted)}
.rt-meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-top:4px}
.rt-meta .gtag{margin-left:0}
.rt-st{font-size:12px;font-weight:600;border-radius:6px;padding:1px 8px;background:var(--panel);color:var(--muted)}
.rt-st.going{background:var(--blue-soft);color:var(--blue)}
.rt-st.done{background:var(--green-soft);color:var(--green-ink)}
.rt-st.again{background:var(--orange-soft);color:var(--orange)}
.rt-steps{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.rt-step{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:5px 12px 5px 6px;font-size:14px;line-height:1.3;cursor:pointer;color:var(--navy);text-decoration:none;text-align:left;max-width:100%}
.rt-step:hover{border-color:var(--accent);color:var(--accent)}
.rt-ck{flex:0 0 auto;width:18px;height:18px;border-radius:50%;border:1.5px solid var(--line-2);display:grid;place-items:center;font-size:11px;font-weight:700}
.rt-step.ok .rt-ck{background:var(--green-ink);border-color:var(--green-ink);color:#fff}
.rt-step.none{cursor:default;color:var(--faint);border-style:dashed;padding-left:12px}
a.rt-step:last-child{background:var(--navy);border-color:var(--navy);color:#fff}
a.rt-step:last-child .rt-ck{border-color:rgba(255,255,255,.5)}
a.rt-step:last-child:hover{background:var(--blue);border-color:var(--blue);color:#fff}
.ent-here{margin:18px 0 6px;border:1px solid #F7C9B9;background:var(--orange-soft);border-radius:14px;padding:14px 16px}
.eh-h{display:flex;align-items:center;gap:8px}
.eh-dot{width:10px;height:10px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 4px rgba(240,80,45,.18)}
.ent-here p{margin:6px 0 8px;font-size:15px;color:#5b3a2f}
.ent-here ul{list-style:none;margin:0;padding:0}
.ent-here li{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding:8px 0;border-top:1px solid #F3D5CA;font-size:15px}
.ent-here .gtag{background:#fff}
.train-box{margin-top:16px;border:1px solid var(--line);border-radius:14px;padding:16px;background:var(--panel)}
.train-box h3{font-size:18px}
.train-list{list-style:none;margin:10px 0 0;padding:0;display:grid;gap:6px}
.train-list a{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:10px 12px;border-radius:10px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--navy);font-size:15px;line-height:1.35}
.train-list a:hover{border-color:var(--accent)}
.train-list .gtag{margin-left:0}
.train-list .arr{color:var(--accent);font-weight:700}
@media (max-width:560px){.rt-item{grid-template-columns:28px 1fr;gap:10px}.rt-num{width:26px;height:26px;font-size:13px}.rt-step{font-size:13.5px}}
.train-g{margin-top:8px;border-top:1px solid var(--line);padding-top:6px}
.train-g summary{cursor:pointer;font-weight:600;font-size:15px;padding:6px 0;list-style-position:inside}
.train-g summary .cnt{font-size:12px;color:var(--muted);background:#fff;border-radius:999px;padding:0 8px;margin-left:4px}
.train-list a{grid-template-columns:1fr auto}

/* статическая (SEO) версия страницы до запуска скрипта */
.seo-side{display:flex;flex-direction:column;gap:2px}
.seo-side a{color:inherit;text-decoration:none}
.seo-side .sn-head{display:flex;justify-content:space-between;padding:8px 10px;font-weight:600}
.seo-side .sn-t{display:grid;grid-template-columns:28px 1fr;padding:6px 10px;font-size:14.5px;border-radius:8px}
.seo-side .sn-t[aria-current]{background:var(--accent-soft)}
.seo-list{margin:8px 0 0;padding-left:20px;display:grid;gap:4px}
.seo-list a,.crumbs a,.related a,.pager a{color:inherit;text-decoration:none}
.seo-list a:hover{color:var(--accent)}
.seo-opts{margin:8px 0;padding-left:24px}
.seo-ans summary{cursor:pointer;color:var(--accent);font-weight:600}
.seo-cta{margin-top:28px}
.x-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin-top:28px}
.x-card{display:flex;flex-direction:column;gap:4px;padding:18px 20px;border-radius:16px;background:var(--blue-soft);color:var(--navy);text-decoration:none;border:1px solid transparent}
.x-card:hover{border-color:var(--blue)}
.x-card b{font-size:17px;color:var(--blue)}
.x-card span{font-size:14.5px;color:var(--muted);line-height:1.45}

/* панель шагов маршрута на конспекте */
.step-bar{position:fixed;left:0;right:0;bottom:16px;z-index:40;display:flex;justify-content:center;pointer-events:none;padding:0 12px}
.sb-in{pointer-events:auto;display:flex;align-items:center;gap:14px;max-width:760px;width:100%;background:var(--navy);color:#fff;border-radius:16px;padding:10px 10px 10px 18px;box-shadow:0 12px 32px rgba(6,34,46,.25)}
.sb-dots{display:flex;gap:5px;flex:none}
.sb-dot{width:22px;height:6px;border-radius:999px;background:rgba(255,255,255,.3)}
.sb-dot.on{background:var(--green)}
.sb-dot.cur{background:#fff}
.sb-txt{flex:1;min-width:0;font-size:14.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sb-txt span{color:#9FB2BA}
.sb-btn{flex:none;border:0;cursor:pointer;background:#fff;color:var(--navy);border-radius:11px;padding:10px 16px;font-weight:800;font-size:14.5px;text-decoration:none}
body:has(.step-bar) .foot{margin-bottom:84px}
@media (max-width:560px){.sb-in{padding:8px 8px 8px 12px;gap:10px}.sb-dots{display:none}.sb-txt{font-size:13px}.sb-btn{padding:9px 12px;font-size:13.5px}}

/* ---------- поиск по содержанию ---------- */
.sr-snip{display:block;width:100%;text-align:left;border:0;background:none;cursor:pointer;font-size:13px;line-height:1.35;color:var(--muted);padding:2px 10px 6px 40px}
.sr-snip:hover{color:var(--navy)}
.sn-t .dot.got{background:var(--green-ink)}

/* ---------- инструменты темы и предмета ---------- */
.topic-tools,.subj-tools{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:16px}
.tool-btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:7px 14px;font-size:14.5px;font-weight:600;cursor:pointer;color:var(--navy);line-height:1.2}
.tool-btn:hover{border-color:var(--accent);color:var(--accent)}
.tool-btn.got input{width:16px;height:16px;accent-color:var(--green-ink);margin:0}
.tool-btn.got:has(input:checked){background:var(--green-soft);border-color:var(--green-ink);color:var(--green-ink)}
.got-n{font-size:14px;color:var(--green-ink);font-weight:600}
.cards-cta{display:grid;grid-template-columns:auto 1fr 16px;gap:14px;align-items:center;width:100%;text-align:left;margin:26px 0 6px;padding:16px 18px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(120deg,#F3F1FF,#EEF6FF);cursor:pointer;color:var(--navy)}
.cards-cta:hover{border-color:var(--blue)}
.cards-cta b{display:block;font-size:17px}.cards-cta span span{display:block;font-size:14.5px;color:var(--muted);margin-top:2px}
.cc-ic{font-size:28px}

/* ---------- карточки ---------- */
.cards-view .page-h p{max-width:62ch}
.c-today{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;margin-top:22px;padding:18px 20px;border-radius:16px;background:var(--blue);color:#fff}
.c-today .kick{display:block;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;opacity:.85}
.c-today b{display:block;font-size:20px;margin-top:2px}.c-today .muted{color:rgba(255,255,255,.85);font-size:14.5px}
.c-today .btn{background:#fff;color:var(--blue)}
.c-decks,.c-modes,.c-subj{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:12px}
.c-deck,.c-mode,.c-sub{position:relative;display:flex;flex-direction:column;gap:4px;text-align:left;padding:16px 18px;border:1px solid var(--line);border-radius:14px;background:#fff;cursor:pointer;color:var(--navy);min-width:0}
.c-deck:hover,.c-mode:hover,.c-sub:hover{border-color:var(--accent)}
.c-deck b,.c-mode b{font-size:16.5px}.c-deck span,.c-mode span{font-size:14px;color:var(--muted);line-height:1.4}
.c-deck em,.c-mode em{font-style:normal;display:inline-flex;align-items:center;gap:5px;margin-top:6px;font-size:12.5px;font-weight:700;color:#8A4FD6}
.c-deck.locked,.c-mode.locked{background:var(--panel)}
.c-sub-n{font-size:17px;font-weight:600}
.c-sub .bar{height:6px;border-radius:99px;background:var(--line);overflow:hidden;margin-top:6px}.c-sub .bar i{display:block;height:100%;background:var(--green-ink)}
.muted{color:var(--muted)}.small{font-size:13px}
.c-filter{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-top:20px}
.c-sel{display:flex;flex-direction:column;gap:4px;font-size:13px;font-weight:600;color:var(--muted);min-width:0;flex:1 1 260px}
.c-sel select{font-size:15px;padding:9px 10px;border:1px solid var(--line-2);border-radius:10px;background:#fff;max-width:100%;color:var(--navy)}
.c-kinds{display:flex;flex-wrap:wrap;gap:6px}
.c-kinds button{border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:7px 12px;font-size:14px;font-weight:600;cursor:pointer;color:var(--muted)}
.c-kinds button[aria-pressed="true"]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.c-stat{margin-top:14px;font-size:14.5px;color:var(--muted)}
.ca{margin-top:30px;padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}
.ca h2{font-size:18px}
.ca-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:12px}
.ca-col{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:6px;font-size:14.5px}
.ca-col b{font-size:15px}.ca-col ul{margin:0;padding-left:18px;color:var(--muted);line-height:1.45}
.ca-col.cur{border:2px solid var(--blue)}.ca-col.done{opacity:.7}
.ca-you{font-size:12.5px;font-weight:700;color:var(--blue);margin-top:auto}
.ca-cta{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto;padding-top:6px}
.ca-cta .btn,.c-lock .btn{text-decoration:none;display:inline-block;font-size:14.5px;padding:9px 14px}
.c-lock{margin-top:18px;padding:18px;border-radius:14px;background:var(--blue-soft)}
.c-lock p{margin:0 0 12px;display:flex;gap:8px;align-items:flex-start}
.c-lock + .c-lock{margin-top:10px}
@media (max-width:760px){.ca-grid{grid-template-columns:1fr}}

.c-stage{margin-top:12px}
.c-top{display:flex;align-items:center;gap:12px;margin:6px 0 10px}
.c-top b{font-size:18px}
.c-x{width:36px;height:36px;border-radius:50%;border:1px solid var(--line-2);background:#fff;cursor:pointer;font-size:15px;flex:none}
.c-prog{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;position:relative}
.c-prog i{flex:1;height:6px;border-radius:99px;background:var(--line);position:relative;overflow:hidden}
.c-prog i b{display:block;height:100%;background:var(--accent);border-radius:99px;transition:width .25s}
.fc-wrap{perspective:1400px;margin:16px auto 0;max-width:620px}
.fc{position:relative;min-height:300px;cursor:pointer;touch-action:pan-y;user-select:none;transition:transform .25s}
.fc-in{position:relative;width:100%;min-height:300px;transition:transform .45s;transform-style:preserve-3d}
.fc.on .fc-in{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 12px 30px rgba(6,34,46,.08);padding:22px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:12px;overflow:auto}
.fc-back{transform:rotateY(180deg);background:var(--accent-soft)}
.c-kind{font-size:12.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--accent)}
.c-q{font-size:21px;font-weight:600;line-height:1.35}
.c-a{font-size:18px;line-height:1.5}.c-a.fx{font-size:22px}
.fc-ctl{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:18px}
.fc-ctl .btn{min-width:120px;font-size:16px;padding:13px 18px}
.fc-ctl .btn.wide{flex:1 1 240px;max-width:360px}
.fc-ctl .btn.no{background:#fff;color:#C2410C;border:1.5px solid #F2B39E}
.fc-ctl .btn.yes{background:var(--green-ink)}
.fc-ctl .btn[disabled]{opacity:.4;cursor:default}
.fc-ctl kbd{font:inherit;font-size:12px;opacity:.6;margin-left:6px}
.fc-hint{font-size:14px;color:var(--muted);text-align:center;margin:14px auto 0;max-width:520px}
.fc-rev{display:flex;gap:8px;align-items:center;justify-content:center;font-size:14px;color:var(--muted);margin-top:14px}
.c-done{text-align:center;padding:30px 10px}
.c-done b{font-size:22px;display:block}.c-done p{color:var(--muted);margin:8px 0 14px}
.c-done .btn{text-decoration:none;display:inline-block}
.c-h3{font-size:17px;margin:12px 0 6px}
.bz-h{display:flex;gap:18px;align-items:center;justify-content:space-between;font-size:15px;margin:6px 0 10px}
.bz-h #bzT,.bz-h #trT{font-size:26px;font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums}
.bz-card,.tr-card{max-width:620px;margin:10px auto 0;min-height:220px;border:1px solid var(--line);border-radius:20px;background:#fff;padding:22px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:10px}
.bz-card.ok{animation:okf .35s}.bz-card.bad{animation:badf .35s}
@keyframes okf{0%{background:var(--green-soft)}100%{background:#fff}}
@keyframes badf{0%{background:var(--orange-soft)}100%{background:#fff}}
.bz-eq{font-size:20px;color:var(--faint)}
.ch{max-width:680px;margin:14px auto 0}
.ch .c-q{text-align:left;font-size:19px}
.ch-img{max-width:100%;border-radius:10px;margin-top:10px}
.ch-opts{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.ch-opts .opt{display:flex;align-items:center;gap:12px;text-align:left;width:100%}
.ch-k{width:26px;height:26px;border-radius:7px;border:1px solid var(--line-2);display:grid;place-items:center;font-size:13px;font-weight:700;flex:none;color:var(--muted)}
.or{list-style:none;padding:0;margin:14px auto 0;max-width:640px;display:flex;flex-direction:column;gap:8px}
.or-i{display:flex;gap:10px;align-items:center;justify-content:space-between;border:1px solid var(--line);border-radius:12px;background:#fff;padding:12px 14px;font-size:15.5px;line-height:1.4}
.or-i.right{border-color:var(--green-ink);background:var(--green-soft)}.or-i.wrong{border-color:var(--orange);background:var(--orange-soft)}
.or-d{display:block;font-weight:700;color:var(--accent);margin-top:2px}
.or-b{display:flex;gap:4px;flex:none}
.or-b button{width:38px;height:38px;border-radius:10px;border:1px solid var(--line-2);background:#fff;cursor:pointer;font-size:17px}
.or-b button:disabled{opacity:.3}
.mp-q{font-size:18px;margin:6px 0 8px;min-height:28px}
.mp{border:1px solid var(--line);border-radius:16px;background:#EAF3FB;overflow:hidden}
.mp svg{display:block;width:100%;height:auto}
.mp-n{fill:#F2F1EC;stroke:#D5D3CA;stroke-width:1}.mp-kz{fill:#FFFDF5;stroke:#9AA3B5;stroke-width:1.4}
.mp-dot{cursor:pointer}.mp-dot circle{fill:var(--blue);stroke:#fff;stroke-width:2}
.mp-dot text{fill:#fff;font-size:12px;font-weight:700;text-anchor:middle;pointer-events:none}
.mp-dot:hover circle:not(.hit),.mp-dot:focus circle:not(.hit){fill:var(--orange)}
.mp-dot.right circle:not(.hit){fill:var(--green-ink)}.mp-dot.wrong circle:not(.hit){fill:var(--orange)}.mp-dot.dim{opacity:.35}
.mp-dot.target circle{fill:var(--orange)}
.ok-t{color:var(--green-ink);font-weight:700}.bad-t{color:#C2410C;font-size:15px}
@media (max-width:560px){.fc,.fc-in{min-height:260px}.c-q{font-size:19px}.fc-ctl .btn{flex:1 1 40%}}
.fc-ctl .nav3{display:grid;grid-template-columns:56px minmax(0,1fr) 56px;gap:10px;width:100%;max-width:520px}
.fc-ctl .nav3 .btn{min-width:0;padding:13px 6px}
.mp-dot text{font-size:15px}
.mp-dot circle.hit{fill:transparent;stroke:none}
.mp-dot text{font-size:20px}
.c-guest{margin-top:14px;padding:12px 14px;border-radius:12px;background:var(--blue-soft);font-size:14.5px;line-height:1.45;display:block}
.c-guest svg{vertical-align:-2px;color:var(--blue)}
.c-off{margin-top:14px}

/* ---------- чтение: размер текста, «что дальше», полоска разделов на телефоне ---------- */
html.kb-fs1 body{font-size:19px}html.kb-fs2 body{font-size:21px}
html.kb-fs1 .gist,html.kb-fs1 .prose p{font-size:1.04em}html.kb-fs2 .gist,html.kb-fs2 .prose p{font-size:1.08em}
.spec span{border:0!important;background:none!important;padding:2px 0!important;display:flex;gap:8px;width:100%;color:var(--muted)}
.spec span::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-top:.62em;opacity:.7}
.spec{flex-direction:column;gap:2px!important}
.next-box{margin-top:34px;padding:20px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}
.next-box h2{font-size:20px}
.next-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.next-topic{display:block;width:100%;margin-top:14px;text-align:left;border:0;border-radius:12px;background:var(--accent);color:#fff;padding:14px 16px;font-size:17px;font-weight:600;cursor:pointer}
.next-topic small{display:block;font-size:13px;opacity:.85;font-weight:600}
.tocm{position:sticky;top:var(--top);z-index:6;background:var(--bg);margin:14px -4px 0;padding:0 4px;border-bottom:1px solid var(--line)}
.tocm-in{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;padding:8px 0}
.tocm-in::-webkit-scrollbar{display:none}
.tocm button{flex:none;border:1px solid var(--line-2);background:var(--bg);border-radius:999px;padding:6px 12px;font-size:13.5px;font-weight:600;cursor:pointer;color:var(--muted);white-space:nowrap}
.tocm button[aria-current="true"]{background:var(--accent);border-color:var(--accent);color:#fff}
.tocm .rp{position:absolute;left:0;right:0;bottom:-1px;height:2px}
.tocm .rp b{display:block;height:100%;width:0;background:var(--accent)}
@media (min-width:1320px){.tocm{display:none}}

/* перетаскивание за ладонь */
.grip{flex:none;width:44px;height:44px;display:grid;place-items:center;border:1px solid var(--line-2);border-radius:12px;background:#fff;color:var(--muted);cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none}
.grip:hover{color:var(--accent);border-color:var(--accent)}
.grip:active{cursor:grabbing}
.order-list li,.or-i{transition:transform .15s}
.order-list li.dragging,.or-i.dragging{transition:none;position:relative;z-index:3;box-shadow:0 10px 26px rgba(6,34,46,.18);background:#fff}
.order-list li.dragging .grip,.or-i.dragging .grip{color:var(--accent);border-color:var(--accent)}
.ci{vertical-align:-3px;flex:none}
.cards-cta .cc-ic{color:var(--blue);display:grid;place-items:center}
/* интерактив на компьютере: рисунок слева, ползунки и ответы справа — всё помещается в экран */
@media (min-width:1100px){
  .wg-body.two{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(240px,1fr);column-gap:22px;grid-auto-flow:row dense;align-items:start}
  .wg-body.two > .pic{grid-column:1;grid-row:span 12;max-width:100%!important;margin-inline:0!important;width:100%}
  .wg-body.two > :not(.pic){grid-column:2;min-width:0}
  .wg-body.two .ctrls{margin-top:0}
}
.order-list,.or{-webkit-user-select:none;user-select:none}
/* Учебные материалы внутри кабинета (iframe): без своей шапки, меню и оглавления */
html.kb-embed{--top:0px}
html.kb-embed header.top,html.kb-embed .side,html.kb-embed .scrim,html.kb-embed .toc,html.kb-embed .menu-btn{display:none!important}
html.kb-embed .shell{grid-template-columns:minmax(0,1fr)!important;min-height:0}
html.kb-embed body{background:transparent}
/* Профиль ученика вверху левого меню — как в кабинете платформы */
.me-box{display:flex;flex-direction:column;gap:2px;padding:4px 4px 12px;margin-bottom:10px;border-bottom:1px solid var(--line,#E3E9F5)}
.me-top{display:flex;align-items:center;gap:12px;padding:6px 8px 10px;text-decoration:none;color:inherit;border-radius:12px}
a.me-top:hover,.me-row:hover{background:#F6F8FD}
.me-ava{position:relative;flex:none;width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px;overflow:hidden;background:#EEF0F6}
.me-ava img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.me-ghost{color:#8A93AD;background:#F1F2F8;border:1.5px dashed #C9CFE0}
.me-t{min-width:0}
.me-n{font-weight:700;font-size:16.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.me-s{font-size:13px;color:#5A6475;line-height:1.35;margin-top:2px}.me-link{color:#3B46E0;font-weight:600}
.me-row{display:block;padding:9px 8px;border-radius:12px;text-decoration:none;color:inherit}
.me-k{display:block;font-size:12px;color:#5A6475}
.me-v{display:block;font-weight:600;font-size:14.5px;margin-top:2px}.me-v.cta{color:#3B46E0}
.me-clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.35}
.me-g{display:flex;justify-content:space-between;gap:8px;font-size:12.5px;color:#5A6475;margin-top:3px}.me-g span:first-child{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.me-g b{font-size:15px;color:#10162F}
.me-btns{display:flex;gap:8px;padding:0 8px}
.me-btns a{flex:1;text-align:center;border-radius:12px;padding:10px 8px;font-weight:700;font-size:14px;text-decoration:none}
.me-in{background:#3B46E0;color:#fff!important}.me-reg{border:1.5px solid #3B46E0;color:#3B46E0!important}
.me-wait .me-ava{background:#F1F2F8}.me-wait .me-n{display:block;width:120px;height:14px;border-radius:7px;background:#F1F2F8}
.me-wait{flex-direction:row;align-items:center;gap:12px;padding:10px 12px 16px}
.me-links{display:flex;flex-direction:column;gap:2px;margin-top:12px;padding-top:10px;border-top:1px solid var(--line,#E3E9F5)}
.me-links a{padding:9px 12px;border-radius:10px;text-decoration:none;color:inherit;font-weight:500;font-size:14.5px}
.me-links a:hover{background:#F6F8FD}.me-links a.muted{color:#5A6475}
/* профиль всегда виден сверху меню, темы прокручиваются под ним */
.side .me-box{position:sticky;top:-14px;z-index:3;background:#fff;margin-top:-14px;padding-top:14px}
@media (max-width:1023px){.side .me-box{position:static}}
/* Поиск — вверху центральной части */
.kbq{position:relative;max-width:740px;margin:0 auto 18px}
.kbq .side-search{margin:0}
.kbq-res{position:absolute;z-index:30;left:0;right:0;top:calc(100% + 6px);background:#fff;border:1px solid var(--line,#E3E9F5);border-radius:14px;box-shadow:0 18px 40px rgba(16,22,47,.12);max-height:min(60vh,520px);overflow:auto;padding:8px}
.kbq-res[hidden]{display:none}
/* Компьютер: та же раскладка, что в кабинете платформы — меню и содержимое в белых
   блоках на светлом фоне, одинаковые ширина, отступы и положение меню. */
@media (min-width:1100px){
  body{background:#F6F8FD}
  .shell{max-width:1240px;margin:0 auto;padding:28px 24px 56px;column-gap:24px;grid-template-columns:290px minmax(0,1fr);align-items:start;min-height:0}
  .side{top:84px;height:auto;max-height:calc(100vh - 108px);background:#fff;border:1px solid #E3E9F5;border-radius:18px;padding:18px 12px 20px}
  .side .me-box{top:-18px;margin-top:-18px;padding-top:18px}
  .nav-link[aria-current="true"]{background:#EBEDFD;color:#3B46E0;box-shadow:none}
  .nav-link:hover{background:#F6F8FD}
  main#app{background:#fff;border:1px solid #E3E9F5;border-radius:18px;padding:28px 32px 56px}
  .toc{padding:8px 0 40px;position:sticky;top:84px;align-self:start}
}
@media (min-width:1320px){.shell{grid-template-columns:290px minmax(0,1fr) 210px}}

/* «Сдать диагностику» в меню — как в кабинете (Coquelicot #F0502D) */
.me-diag{display:flex;align-items:center;gap:10px;margin:8px 0 0;padding:11px 12px;border-radius:12px;background:rgba(240,80,45,.12);color:#B5371A!important;font-weight:700;font-size:14.5px;text-decoration:none}
.me-diag:hover{background:rgba(240,80,45,.2)}
.me-diag-ar{margin-left:auto}