/* ---- Academy (build_academy.py) -------------------------------------
   Appended to shell()'s stylesheet, so it may override anything above it.
   Scoped by document: only Academy pages carry this block, which is why
   widening .wrap here cannot affect /study/ or /answers/ pages. Tokens are
   the ones shell() already defines -- no new palette, no new type scale.
   Card radius stays 3px to match every other static page (spec §8 defers
   to the existing Atlas design system).

   Faze 3 (2026-08-31): .wrap/nav.crumb no longer overridden here -- both
   now default to --measure-wide (1100px) in shell()'s own CSS, the same
   value this override used to hardcode as 1060px. Learn widens by 40px
   to line up with .oma-topbar-inner, per the typography plan §7 Faze 3. */
.ac-eyebrow{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--teal);font-weight:600;margin:0 0 10px}
.ac-hero{max-width:780px;margin:0 0 34px}
.ac-hero h1{font-size:clamp(26px,3.4vw,34px);line-height:1.18;margin:0 0 12px}
.ac-hero .ac-lede{font-size:17px;line-height:1.62;color:var(--soft);margin:0 0 20px}
.ac-cta{display:inline-flex;align-items:center;min-height:44px;background:var(--ink);
  color:var(--on-ink,#fff);text-decoration:none;padding:11px 20px;border-radius:3px;font-size:15px;
  font-weight:600}
.ac-cta:hover{background:var(--teal)}
.ac-cta.ac-quiet{background:none;color:var(--ink);border:1px solid var(--line);font-weight:400}
.ac-cta.ac-quiet:hover{background:rgba(163,31,52,.06);color:var(--teal)}

/* Homepage prestavba (2026-09-06): "kde jsi" pruh + ctyri rovnocenne vstupy.
   Duvod: stranka mela jedno primarni tlacitko na lekci 01 a tri z peti bloku
   o jednom pilíri, takze Practice Arena i Challenges vypadaly jako prilohy.
   Tokeny jsou porad ty, ktere definuje shell() -- zadna nova paleta. */
.ac-resume{--ac-tint:rgba(163,31,52,.09);border:1px solid var(--line);border-radius:3px;
  padding:18px 20px;display:flex;gap:24px;align-items:center;flex-wrap:wrap;margin:0 0 30px}
html[data-theme="dark"] .ac-resume{--ac-tint:rgba(108,168,178,.16)}
.ac-resume .ac-rl{flex:1 1 320px;min-width:min(100%,280px)}
.ac-rk{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--soft);font-weight:600;margin:0 0 6px}
.ac-rbig{font-size:19px;font-weight:700;margin:0 0 4px;letter-spacing:-.01em}
.ac-rmeta{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--soft);margin:0}
.ac-rmeta b{color:var(--ink)}
.ac-rbtns{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.ac-mini{flex:0 0 auto}
.ac-mini svg{display:block;width:150px;height:auto}
.ac-mini .m-r{fill:var(--soft);opacity:.2}
.ac-mini .m-n{fill:none;stroke:var(--line);stroke-width:1}
.ac-mini .m-n[data-m="1"]{fill:var(--ac-tint);stroke:var(--teal)}
.ac-mini .m-n[data-m="3"]{fill:var(--teal);stroke:var(--teal)}
.ac-mini .m-n[data-m="4"]{fill:var(--amber);stroke:var(--amber)}
.ac-mini .m-c{font-family:'IBM Plex Mono',monospace;font-size:10.5px;fill:var(--soft)}

.ac-ways{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));
  gap:14px;margin:0 0 8px}
.ac-way{border:1px solid var(--line);border-radius:3px;padding:18px 20px 16px;display:flex;
  flex-direction:column;gap:7px}
.ac-way .ac-kind{font-family:'IBM Plex Mono',monospace;font-size:10.5px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--soft);font-weight:600}
.ac-way h3{margin:0;font-size:17px;letter-spacing:-.01em}
.ac-way p{margin:0;font-size:14px;color:var(--soft);line-height:1.55;flex:1}
.ac-way .ac-state{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--ink);
  border-top:1px solid var(--line);padding-top:9px;margin-top:4px}
.ac-way .ac-state i{font-style:normal;color:var(--soft)}
.ac-way .ac-bar{height:5px;background:var(--line);display:block;margin:6px 0 0;position:relative}
.ac-way .ac-bar i,.ac-way .ac-bar u{position:absolute;left:0;top:0;height:100%;background:var(--teal)}
.ac-way .ac-bar u{opacity:.28}
.ac-way .ac-go{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:600;
  letter-spacing:.03em;text-decoration:none}
.ac-sechead{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--soft);font-weight:600;margin:30px 0 12px}
.ac-first[hidden]{display:none}
.ac-firstlist{margin:0;padding:0;list-style:none;counter-reset:fh;border-top:1px solid var(--line)}
.ac-firstlist li{counter-increment:fh;border-bottom:1px solid var(--line)}
.ac-firstlist a{display:flex;gap:10px;align-items:baseline;padding:12px 4px;text-decoration:none;
  color:var(--ink);font-size:15px;line-height:1.45;min-height:44px}
.ac-firstlist a:before{content:counter(fh);font-family:'IBM Plex Mono',monospace;font-size:12px;
  color:var(--teal);min-width:1.4em}
.ac-firstlist a:hover b{color:var(--teal)}
.ac-firstlist i{font-style:normal;font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--soft);
  white-space:nowrap}
.ac-expert{margin:16px 0 0;font-size:14px;color:var(--soft);line-height:1.6}
.ac-expert b{color:var(--ink)}
.ac-expert a{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:600;white-space:nowrap}

/* entry cards + curriculum -------------------------------------------- */
.ac-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;
  margin:0 0 34px}
.ac-card{border:1px solid var(--line);border-radius:3px;padding:20px 22px;
  display:flex;flex-direction:column;gap:8px}
.ac-card h3{margin:0;font-size:16px}
.ac-card p{margin:0;font-size:14px;color:var(--soft);line-height:1.55;flex:1}
.ac-card .ac-go{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:600;
  letter-spacing:.04em;text-decoration:none}
.ac-card.ac-soon{opacity:.62}
.ac-card.ac-soon .ac-go{color:var(--soft)}

.ac-list{list-style:none;padding:0;margin:0 0 8px;border-top:1px solid var(--line)}
.ac-list li{border-bottom:1px solid var(--line)}
.ac-list a,.ac-list .ac-row{display:flex;align-items:baseline;gap:12px;padding:13px 4px;
  text-decoration:none;color:var(--ink);min-height:44px}
.ac-list a:hover{background:rgba(163,31,52,.05)}
.ac-list .ac-n{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--soft);
  width:22px;flex:none}
.ac-list .ac-state{font-family:'IBM Plex Mono',monospace;font-size:13px;width:16px;flex:none;
  color:var(--soft)}
.ac-list .ac-state[data-done="1"]{color:var(--teal)}
.ac-list .ac-ttl{flex:1;font-size:15px;font-weight:600}
.ac-list .ac-meta{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--soft);
  letter-spacing:.03em;white-space:nowrap}
.ac-list li.ac-planned .ac-ttl{font-weight:400;color:var(--soft)}

/* "Your path" strip -- a map of the course, not a score. */
.ac-sechead-row{display:flex;align-items:baseline;justify-content:space-between;gap:14px}
.ac-sechead-row a{color:var(--teal);text-decoration:none;border-bottom:1px solid transparent}
.ac-sechead-row a:hover{border-bottom-color:currentColor}
.ac-path{-webkit-mask-image:linear-gradient(90deg,#000 94%,rgba(0,0,0,.15));
  mask-image:linear-gradient(90deg,#000 94%,rgba(0,0,0,.15));
  list-style:none;display:flex;gap:0;padding:0;margin:0 0 34px;overflow-x:auto;
  -webkit-overflow-scrolling:touch;scrollbar-width:none;border-top:1px solid var(--line);
  border-bottom:1px solid var(--line)}
.ac-path::-webkit-scrollbar{display:none}
.ac-path li{flex:0 0 auto;border-right:1px solid var(--line)}
.ac-path li:last-child{border-right:none}
.ac-path a,.ac-path .ac-row{display:flex;align-items:center;gap:7px;padding:11px 16px;
  min-height:44px;text-decoration:none;color:var(--ink);
  font-family:'IBM Plex Mono',monospace;font-size:11.5px;letter-spacing:.03em}
.ac-path a:hover{background:rgba(163,31,52,.05);color:var(--teal)}
.ac-path .ac-pathttl{font-family:'DM Sans',-apple-system,sans-serif;font-size:13px;
  letter-spacing:0;white-space:nowrap}
.ac-path li.ac-planned .ac-pathttl,.ac-path li.ac-planned .ac-row{color:var(--soft)}

/* lesson layout -------------------------------------------------------- */
.ac-lesson{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:44px;align-items:start}
.ac-main{min-width:0;max-width:760px}
.ac-rail{position:sticky;top:18px;font-size:13px}
.ac-rail h4{font-family:'IBM Plex Mono',monospace;font-size:10.5px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--soft);margin:0 0 9px;font-weight:600}
.ac-rail ol{list-style:none;padding:0;margin:0 0 24px;border-left:1px solid var(--line)}
.ac-rail ol li{margin:0}
.ac-rail ol a{display:block;padding:5px 0 5px 12px;color:var(--soft);text-decoration:none;
  line-height:1.4;border-left:2px solid transparent;margin-left:-1px}
.ac-rail ol a:hover{color:var(--teal);border-left-color:var(--teal)}
.ac-ctx{border-top:1px solid var(--line);padding-top:14px}
.ac-chain{list-style:none;padding:0;margin:0}
.ac-chain li{padding:4px 0 4px 12px;border-left:1px solid var(--line);color:var(--soft);
  line-height:1.4}
.ac-chain li.ac-here{border-left:2px solid var(--teal);color:var(--ink);font-weight:600}
.ac-chain a{color:inherit;text-decoration:none}
.ac-chain a:hover{color:var(--teal)}
.ac-conceptlbl{font-family:'IBM Plex Mono',monospace;font-size:10.5px;letter-spacing:.09em;
  text-transform:uppercase;color:var(--soft);margin:18px 0 3px}
.ac-concepts{font-size:14px;color:var(--soft);margin:0}

.ac-q{font-family:'Cormorant Garamond',Georgia,serif;font-size:clamp(21px,2.6vw,26px);
  line-height:1.3;color:var(--teal);margin:0 0 22px;font-weight:500}
.ac-section{margin:0 0 34px}
.ac-section>h2{font-size:17px;margin:34px 0 12px}
.ac-note{border-left:3px solid var(--line);padding:2px 0 2px 16px;color:var(--soft);
  font-size:15px}
.ac-idea p{font-size:17px;line-height:1.62}

/* figures -------------------------------------------------------------- */
.ac-fig{margin:18px 0 22px;padding:0}
.ac-svg{width:100%;height:auto;color:var(--ink);overflow:visible}
.ac-box{fill:none;stroke:var(--line-strong,rgba(0,0,0,.34));stroke-width:1}
.ac-box.ac-accent{stroke:var(--teal);stroke-width:1.5}
.ac-organelle{fill:rgba(163,31,52,.05);stroke:var(--line);stroke-width:1}
.ac-t{font-family:'DM Sans',-apple-system,sans-serif;font-size:12px;fill:var(--ink);
  text-anchor:middle}
.ac-t.ac-lead{font-size:17px;font-weight:700}
.ac-t.ac-sub{font-size:11px;fill:var(--soft)}
.ac-t .ac-em{font-style:italic;fill:var(--teal)}
.ac-arrow{stroke:var(--ink);stroke-width:1.2;fill:none;color:var(--ink)}
.ac-arrow.ac-thin{stroke-width:1}
.ac-inh{stroke:var(--teal);stroke-width:1.6;fill:none}
.ac-dash{stroke:var(--soft);stroke-width:1;stroke-dasharray:3 3;fill:none}

/* evidence ------------------------------------------------------------- */
.ac-ev{display:grid;gap:10px;margin:6px 0 10px}
.ac-evcard{border:1px solid var(--line);border-radius:3px;padding:13px 15px}
.ac-evhead{display:flex;align-items:baseline;gap:9px;flex-wrap:wrap;margin-bottom:5px}
.ac-evyear{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--soft)}
.ac-evtitle{font-size:15px;font-weight:600;text-decoration:none;color:var(--ink)}
.ac-evtitle:hover{color:var(--teal)}
.ac-evcard .ac-evfind{font-size:14px;color:var(--soft);line-height:1.55;margin:0}
.ac-evlink{font-family:'IBM Plex Mono',monospace;font-size:11.5px;
  display:inline-flex;align-items:center;min-height:32px}

/* think ---------------------------------------------------------------- */
.ac-think{border:1px solid var(--line);border-left:3px solid var(--teal);border-radius:3px;
  padding:16px 18px;margin:0 0 12px}
.ac-think .ac-prompt{font-size:16px;line-height:1.55;margin:0 0 8px}
.ac-think .ac-hint{font-size:13.5px;color:var(--soft);margin:0 0 10px}
.ac-think details>summary{cursor:pointer;font-family:'IBM Plex Mono',monospace;font-size:12px;
  font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--teal);
  list-style:none;display:inline-flex;align-items:center;min-height:44px}
.ac-think details>summary::-webkit-details-marker{display:none}
.ac-think details>summary::after{content:" \2192"}
.ac-think details[open]>summary::after{content:""}
.ac-think .ac-reveal{font-size:14.5px;line-height:1.6;margin:2px 0 0}

/* quiz ------------------------------------------------------------------
   Spec §2/§18 again: this is a comprehension check, not a game. Nothing is
   stored, nothing is scored across lessons, there is no pass mark and no
   streak. Feedback is per-question and immediate, and the reason the answer
   is right is the point -- the tick is not.
   Correctness is never carried by colour alone (a glyph and a word carry it
   too), and the evidence-tier palette is deliberately NOT reused here: those
   colours mean study type, not "good/bad". */
.ac-quiz{margin:4px 0 0}
.ac-qz{border:1px solid var(--line);border-radius:3px;padding:15px 18px 12px;margin:0 0 12px}
.ac-qz .ac-qzq{font-size:16px;line-height:1.55;margin:0 0 10px}
.ac-qzn{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;color:var(--soft);display:block;margin:0 0 4px}
.ac-qzrec{display:none;font-family:'IBM Plex Mono',monospace;font-size:10px;
  letter-spacing:.06em;text-transform:uppercase;color:var(--teal);border:1px solid var(--teal);
  border-radius:3px;padding:1px 7px;margin:0 0 8px}
/* Reading level -> ktera otazka se oznaci "Start here" (viz QZ_LEVEL_REC).
   Chybejici data-level na <html> = student (stejna konvence jako chrome_shared
   .LEVEL_SWITCH_CSS), takze medium otazka je doporucena, dokud si ctenar
   uroven nezmeni. */
html:not([data-level]) .ac-qzrec[data-lv="student"],
html[data-level="student"] .ac-qzrec[data-lv="student"]{display:inline-block}
html[data-level="beginner"] .ac-qzrec[data-lv="beginner"]{display:inline-block}
html[data-level="research"] .ac-qzrec[data-lv="research"]{display:inline-block}
.ac-qzopts{list-style:none;padding:0;margin:0}
.ac-qzopts li{margin:0 0 6px}
.ac-qzopt{display:flex;gap:9px;align-items:flex-start;width:100%;text-align:left;
  min-height:44px;padding:9px 12px;font:inherit;font-size:15px;line-height:1.5;
  color:var(--ink);background:transparent;border:1px solid var(--line);border-radius:3px;
  cursor:pointer}
.ac-qzopt:hover{border-color:var(--teal)}
.ac-qzopt:focus-visible{outline:2px solid var(--teal);outline-offset:2px}
.ac-qzkey{font-family:'IBM Plex Mono',monospace;font-size:12.5px;font-weight:600;
  color:var(--soft);flex:0 0 auto;padding-top:1px}
.ac-qz[data-done] .ac-qzopt{cursor:default}
.ac-qz[data-done] .ac-qzopt:hover{border-color:var(--line)}
.ac-qzopt[data-mark="right"]{border-color:var(--teal);box-shadow:inset 3px 0 0 var(--teal)}
.ac-qzopt[data-mark="right"] .ac-qzkey{color:var(--teal)}
.ac-qzopt[data-mark="wrong"]{border-color:var(--amber);box-shadow:inset 3px 0 0 var(--amber)}
.ac-qzopt[data-mark="wrong"] .ac-qzkey{color:var(--amber)}
.ac-qzopt[data-mark] .ac-qzkey::after{content:" \2713"}
.ac-qzopt[data-mark="wrong"] .ac-qzkey::after{content:" \2715"}
.ac-qzwhy{font-size:14.5px;line-height:1.6;margin:10px 0 2px;
  border-left:3px solid var(--teal);padding:0 0 0 12px}
.ac-qzverdict{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;color:var(--soft);display:block;margin:0 0 4px}
.ac-qz details>summary{cursor:pointer;font-family:'IBM Plex Mono',monospace;font-size:12px;
  font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--teal);
  list-style:none;display:inline-flex;align-items:center;min-height:44px}
.ac-qz details>summary::-webkit-details-marker{display:none}
.ac-qz details>summary::after{content:" \2192"}
.ac-qz details[open]>summary::after{content:""}
.ac-qz details p{font-size:14.5px;line-height:1.6;margin:2px 0 0}
.ac-qztally{font-size:14px;color:var(--soft);margin:2px 0 0}

/* learning objectives + research skill (Phase 2 §12/§13) ------------------ */
.ac-objlbl{font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:600;
  letter-spacing:.07em;text-transform:uppercase;color:var(--soft);margin:0 0 8px}
.ac-objlist{margin:0 0 10px;padding-left:20px}
.ac-objlist li{font-size:15.5px;line-height:1.6;margin:0 0 5px}
.ac-skill{font-size:14px;color:var(--soft);margin:0}
.ac-skill span{font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;margin-right:8px}

/* interactive exercises (Phase 2) ---------------------------------------
   Tri vrstvy, stejne jako kviz: obsah je v HTML, <details> ho slozi pro
   ctenare bez JS, JS ho jen sekvencuje. Nic vedeckeho nezije jen v JS --
   verify_prerender.py a pravidlo 13 ve verify_academy.py to hlidaji.
   Barva nikdy nenese vyznam sama: stav uzlu je barva + tloustka + slovo,
   spravnost je glyf + slovo. Paleta evidence tieru se tu NEPUJCUJE. */
.ac-ex{border:1px solid var(--line);border-radius:3px;padding:16px 18px 14px;margin:0 0 16px}
.ac-exkind{font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:600;
  letter-spacing:.07em;text-transform:uppercase;color:var(--soft);display:block;margin:0 0 6px}
.ac-ex h3{font-size:17px;line-height:1.35;margin:0 0 8px}
.ac-ex p{font-size:15.5px;line-height:1.6;margin:0 0 10px}
.ac-ex details{margin:0 0 4px}
.ac-ex details>summary{cursor:pointer;font-family:'IBM Plex Mono',monospace;font-size:12px;
  font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--teal);
  list-style:none;display:inline-flex;align-items:center;min-height:44px}
.ac-ex details>summary::-webkit-details-marker{display:none}
.ac-ex details>summary::after{content:" \2192"}
.ac-ex details[open]>summary::after{content:""}
.ac-ex details p,.ac-ex details li{font-size:14.5px;line-height:1.6}

/* what this shows / does not show */
.ac-shows{list-style:none;padding:0;margin:0 0 10px}
.ac-shows li{position:relative;padding-left:26px;font-size:15px;line-height:1.55;margin:0 0 6px}
.ac-shows li::before{position:absolute;left:0;top:0;font-family:'IBM Plex Mono',monospace;
  font-weight:600}
.ac-shows li.ac-yes::before{content:"\2713";color:var(--teal)}
.ac-shows li.ac-no::before{content:"\2715";color:var(--amber)}
.ac-showslbl{font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;color:var(--soft);margin:0 0 6px}

/* interactive model */
.ac-model{margin:0}
/* Na uzkem displeji by se schema zmenslo tak, ze by popisky uzlu byly
   necitelne. Misto toho dostane vlastni vodorovny scroll -- stranka sama
   se nikdy neposouva do strany (stejny vzor jako .ac-cmpwrap a pravy rail). */
.ac-mdscroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:2px 0 10px}
.ac-mdsvg{width:100%;height:auto;color:var(--ink);overflow:visible;display:block;margin:0 auto}
.ac-mdnode rect{fill:var(--paper);stroke:var(--line-strong,rgba(0,0,0,.34));stroke-width:1}
.ac-mdnode text{font-family:'DM Sans',-apple-system,sans-serif;font-size:12px;fill:var(--ink);
  text-anchor:middle}
.ac-mdnode[data-flow="on"] rect{stroke:var(--teal);stroke-width:2}
.ac-mdnode[data-flow="off"] rect{stroke-dasharray:3 3}
.ac-mdnode[data-flow="off"] text{fill:var(--soft)}
.ac-mdnode{cursor:pointer}
.ac-mdnode:focus-visible rect{outline:2px solid var(--teal);outline-offset:2px}
.ac-mdedge{fill:none;stroke:var(--ink);stroke-width:1.2;pointer-events:none}  /* hrana nikdy nesmi prekryt klikaci uzel */
.ac-mdedge[data-eff="inhibits"]{stroke:var(--teal);stroke-width:1.6}
.ac-mdedge[data-flow="off"]{stroke:var(--soft);stroke-dasharray:4 4;stroke-width:1}
.ac-mdstate{font-family:'IBM Plex Mono',monospace;font-size:11px;fill:var(--soft);
  text-anchor:middle}
.ac-mdctl{display:flex;flex-wrap:wrap;gap:14px;margin:0 0 12px}
.ac-mdgrp{display:flex;flex-direction:column;gap:4px}
.ac-mdgrp>span{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--soft)}
.ac-mdbtns{display:flex;border:1px solid var(--line);border-radius:3px;overflow:hidden}
.ac-mdbtns button{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.04em;
  text-transform:uppercase;background:none;border:none;border-right:1px solid var(--line);
  padding:0 14px;min-height:44px;cursor:pointer;color:var(--ink)}
.ac-mdbtns button:last-child{border-right:none}
/* 27. 9. 2026: tri tlacitka (rapamycin / ATP-competitive / bi-steric) se
   na 320 px nevesla a lekce sla posouvat do strany o 3 px. */
@media (max-width:400px){.ac-mdbtns button{padding:0 9px;letter-spacing:.02em}}
.ac-mdbtns button:hover{color:var(--teal)}
.ac-mdbtns button[aria-pressed="true"]{background:var(--ink);color:var(--on-ink,#fff);font-weight:600}
.ac-mdout{border-left:3px solid var(--teal);padding:2px 0 2px 12px;margin:0 0 10px}
.ac-mdreadout{font-family:'IBM Plex Mono',monospace;font-size:13px;margin:0 0 4px}
.ac-mdnote{font-size:14.5px;line-height:1.6;margin:0}
.ac-mdkey{margin:8px 0 6px;padding:0}
.ac-mdkey div{border-top:1px solid var(--line);padding:8px 0}
.ac-mdkey dt{font-weight:600;font-size:14.5px;margin:0 0 2px}
.ac-mdkey dd{margin:0;font-size:14px;line-height:1.55;color:var(--soft)}
.ac-mdkey div[data-hi="1"]{background:rgba(163,31,52,.06)}
.ac-mdreset{background:none;border:none;padding:0;font-family:'IBM Plex Mono',monospace;
  font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--teal);
  cursor:pointer;min-height:44px}
.ac-mdcap{font-size:13.5px;color:var(--soft);line-height:1.55;margin:-4px 0 12px}
.ac-mdteach{font-size:13px;color:var(--soft);line-height:1.5;margin:6px 0 0}

/* predict -> observe -> explain */
.ac-pdstep{font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:600;
  letter-spacing:.07em;text-transform:uppercase;color:var(--soft);display:block;margin:12px 0 6px}
.ac-pdobs{border:1px solid var(--line);border-radius:3px;padding:12px 14px;margin:0 0 10px}
.ac-pdmethod{font-size:14px;color:var(--soft);line-height:1.55;margin:6px 0 6px}
.ac-pdreadout{font-size:15.5px;line-height:1.55;margin:0 0 8px}

/* evidence comparison */
.ac-cmp{width:100%;border-collapse:collapse;margin:2px 0 12px;font-size:14.5px}
.ac-cmp th,.ac-cmp td{border-bottom:1px solid var(--line);padding:8px 10px 8px 0;
  text-align:left;vertical-align:top;line-height:1.5}
.ac-cmp th{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--soft);font-weight:600}
.ac-cmpwrap{overflow-x:auto}

/* experiment builder */
.ac-dsgrid{display:grid;gap:14px;margin:0 0 12px}
@media (min-width:620px){.ac-dsgrid{grid-template-columns:1fr 1fr}}
.ac-dsgrp{border:1px solid var(--line);border-radius:3px;padding:10px 12px}
.ac-dsgrp>legend,.ac-dsgrp>.ac-dslbl{font-family:'IBM Plex Mono',monospace;font-size:11px;
  letter-spacing:.06em;text-transform:uppercase;color:var(--soft);padding:0;margin:0 0 6px}
.ac-dsopt{display:flex;gap:9px;align-items:flex-start;min-height:44px;padding:4px 0;
  font-size:14.5px;line-height:1.5;cursor:pointer}
.ac-dsopt input{margin-top:5px;flex:0 0 auto;accent-color:var(--teal)}
.ac-dsfb{border-left:3px solid var(--teal);padding:2px 0 2px 12px;margin:10px 0 0}
.ac-dsfb h4{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--soft);margin:0 0 6px;font-weight:600}
.ac-dsfb p{font-size:14.5px;line-height:1.6;margin:0 0 8px}

.ac-deeper{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 14px}
.ac-deeper a{display:inline-flex;align-items:center;min-height:36px;font-size:13.5px;
  border:1px solid var(--line);border-radius:3px;padding:5px 11px;text-decoration:none}
.ac-deeper a:hover{border-color:var(--teal)}
.ac-routes{list-style:none;padding:0;margin:6px 0 16px}
.ac-routes li{margin:0 0 9px}
.ac-routes a{font-size:15px;font-weight:600;text-decoration:none}
.ac-routes span{display:block;font-size:13.5px;color:var(--soft);line-height:1.5}
.ac-res{transition:border-color .15s,transform .15s,box-shadow .15s}
.ac-res:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:0 6px 18px rgba(0,0,0,.06)}
.ac-res[hidden],.ac-fcgroup[hidden],.ac-fcfilter[hidden]{display:none}
.ac-res h3 a{text-decoration:none}
.ac-res h3 a:hover{text-decoration:underline}
.ac-fctop{display:flex;align-items:center;gap:10px}
.ac-fctop .ac-kind i{font-style:normal;letter-spacing:.06em;color:var(--ink);font-weight:500}
.ac-fcico{flex:none;width:38px;height:38px;border-radius:50%;background:var(--ac-tint);
  color:var(--teal);display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line)}
.ac-fcgrid{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}
.ac-fcmeta{display:flex;flex-direction:column;gap:7px;border-top:1px solid var(--line);
  padding-top:10px;margin-top:4px}
.ac-fcrow{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}
.ac-mt{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--teal);font-weight:600;
  flex:1;min-width:0}
.ac-fcdepth{display:inline-flex;align-items:flex-end;gap:2px;height:14px;flex:none;margin-right:6px}
.ac-fcdepth i{display:block;width:5px;background:var(--line);border-radius:1px}
.ac-fcdepth i:nth-child(1){height:6px}.ac-fcdepth i:nth-child(2){height:10px}
.ac-fcdepth i:nth-child(3){height:14px}
.ac-fcdepth[data-d="1"] i:nth-child(-n+1),.ac-fcdepth[data-d="2"] i:nth-child(-n+2),
.ac-fcdepth[data-d="3"] i{background:var(--teal)}
.ac-fcpills{display:inline-flex;gap:3px}
.ac-fcpill{font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.06em;
  text-transform:uppercase;padding:2px 6px;border-radius:10px;border:1px solid var(--line);
  color:var(--soft);opacity:.55}
.ac-fcpill.on{border-color:var(--teal);color:var(--teal);opacity:1;font-weight:600}
.ac-fctime{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--soft)}
.ac-fccert{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--soft);
  background:var(--ac-tint);border-radius:3px;padding:4px 7px;align-self:flex-start}
.ac-fccert.paid{color:var(--ink)}
.ac-fcav{flex:none;width:40px;height:40px;border-radius:50%;object-fit:cover;object-position:50% 22%;
  border:1px solid var(--line);background:var(--ac-tint)}
.ac-fclogo{display:inline-block;border-radius:8px;background-color:#fff;background-size:cover;
  background-position:center}
.ac-res.ac-pick{border-top:3px solid var(--teal)}
.ac-fcpick{font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.08em;
  text-transform:uppercase;font-weight:600;color:#fff;background:var(--teal);border-radius:10px;
  padding:2px 8px;align-self:flex-start;margin:0 0 -2px}
.ac-checked{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--soft);margin:0 0 18px}
.ac-fcpaths{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:14px}
.ac-fcpath{border:1px solid var(--line);border-left:3px solid var(--teal);border-radius:3px;
  padding:16px 20px 12px}
.ac-fcpath .ac-kind{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--teal);font-weight:600;margin:0}
.ac-fcpsub{font-size:14px;color:var(--soft);margin:4px 0 10px}
.ac-fcpath ol{list-style:none;counter-reset:fc;padding:0;margin:0}
.ac-fcpath li{counter-increment:fc;position:relative;padding:0 0 12px 36px;font-size:15px;line-height:1.45}
.ac-fcpath li::before{content:counter(fc);position:absolute;left:0;top:-1px;width:24px;height:24px;
  border-radius:50%;background:var(--teal);color:#fff;font-family:'IBM Plex Mono',monospace;
  font-size:12px;font-weight:600;display:flex;align-items:center;justify-content:center}
.ac-fcpath li:not(:last-child)::after{content:"";position:absolute;left:11.5px;top:25px;bottom:1px;
  width:1px;background:var(--line)}
.ac-fcpath a{text-decoration:none}
.ac-fcpath a:hover{text-decoration:underline}
.ac-fclegend{display:flex;flex-direction:column;gap:8px;font-size:14px;color:var(--soft);margin:0 0 10px}
.ac-fclegend .ac-fcdepth{vertical-align:-2px}
.ac-fcfilter{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin:14px 0 0}
.ac-fcfilter span{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--soft);margin-right:4px}
.ac-fcfilter button{font:inherit;font-size:13.5px;min-height:36px;padding:5px 14px;cursor:pointer;
  border:1px solid var(--line);border-radius:18px;background:transparent;color:var(--ink)}
.ac-fcfilter button:hover{border-color:var(--teal)}
.ac-fcfilter button[aria-pressed="true"]{background:var(--teal);border-color:var(--teal);color:#fff}
.ac-fchead{display:flex;align-items:baseline;flex-wrap:wrap;gap:4px 10px;margin:0;
  padding:16px 0 14px 26px;position:relative;cursor:pointer;list-style:none;
  border-bottom:1px solid var(--line)}
.ac-fchead::-webkit-details-marker{display:none}
.ac-fchead::before{content:"";position:absolute;left:4px;top:23px;width:7px;height:7px;
  border-right:2px solid var(--teal);border-bottom:2px solid var(--teal);
  transform:rotate(-45deg);transition:transform .15s}
details[open]>.ac-fchead::before{transform:rotate(45deg);top:21px}
.ac-fchead:hover h2{color:var(--teal)}
.ac-fchead:focus-visible{outline:2px solid var(--teal);outline-offset:2px}
.ac-fcgroup{margin:0}
.ac-fcgroup[open]>.ac-fcgrid{margin:16px 0 26px}
.ac-fchead h2{margin:0;font-size:19px;border:0;padding:0}
.ac-fchead .ac-fcblurb{flex-basis:100%;margin:2px 0 0}
.ac-fccount{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--teal);
  border:1px solid var(--teal);border-radius:10px;padding:1px 7px}
.ac-fcblurb{color:var(--soft);font-size:14.5px;margin:4px 0 14px}
.ac-nextbar{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  border-top:1px solid var(--line);padding-top:18px;margin-top:34px}

/* Hlavicka casti v seznamu lekci. Neni to odkaz -- cast nema vlastni adresu,
   je to hranice uvnitr jednoho seznamu. */
.ac-parthead{display:block;padding:22px 0 10px;border-top:1px solid var(--line);
  margin-top:10px}
.ac-list li.ac-parthead:first-child{border-top:none;margin-top:0;padding-top:4px}
.ac-partn{display:inline-block;font-size:12.5px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--soft);margin-right:10px}
.ac-parttitle{font-size:17px;font-weight:700}
.ac-partq{display:block;font-size:15px;margin-top:4px}
.ac-partdone{display:block;font-size:13.5px;color:var(--soft);margin-top:3px;
  line-height:1.5}

/* "Practice this lesson" -- rozcestnik do Areny, ne vlozena hra. Uvnitr lekce
   se nic nehraje: vlozena hra by porusila paritu bez JS (pravidlo 8/13), tak
   jako ji drzi kviz a cviceni. Cely blok je staticke HTML. */
.ac-practice ul{list-style:none;padding:0;margin:10px 0 14px;display:flex;
  flex-wrap:wrap;gap:8px}
.ac-practice ul li{font-size:13.5px;line-height:1;padding:7px 11px;border-radius:3px;
  border:1px solid var(--line);color:var(--soft)}
.ac-practice .ac-pracgo{margin:14px 0 8px}

@media (max-width:1000px){
  /* Spec §10: the right rail collapses into horizontal navigation above the
     text (order:-1 on a grid item), and the page must not overflow sideways --
     so the strip itself scrolls, the page does not. The "where this fits"
     block is dropped here rather than stacked: the same information is carried
     by the prev/next bar and the curriculum link, so nothing lives only in the
     rail. No JS, no <details> quirks. */
  .ac-lesson{grid-template-columns:minmax(0,1fr);gap:0}
  .ac-main{max-width:none}
  .ac-rail{position:static;order:-1;margin:0 0 26px;padding:0 0 4px;
    border-bottom:1px solid var(--line)}
  .ac-rail h4{margin:0 0 6px}
  .ac-rail ol{display:flex;gap:0;margin:0;border-left:none;overflow-x:auto;
    -webkit-overflow-scrolling:touch;scrollbar-width:none}
  .ac-rail ol::-webkit-scrollbar{display:none}
  .ac-rail ol li{flex:0 0 auto}
  .ac-rail ol a{white-space:nowrap;padding:8px 14px 8px 0;border-left:none;margin-left:0;
    min-height:40px;display:flex;align-items:center}
  .ac-ctx{display:none}
}
@media (max-width:560px){
  .ac-hero .ac-lede{font-size:16px}
  .ac-list a,.ac-list .ac-row{flex-wrap:wrap;gap:8px}
  .ac-list .ac-meta{width:100%}
}