/* =========================================================
   Výuka SPŠE Mohelnice – Elektrotechnika & Elektronika
   ========================================================= */
:root{
  --paper:#EEF2F0;
  --surface:#FFFFFF;
  --ink:#16222C;
  --ink-2:#3A4A56;
  --muted:#5D6D78;
  --line:#D3DCD8;
  --line-2:#E4EAE7;
  --pad:#B7861F;           /* pájecí plošky – zlatá */
  --pad-soft:#FBF3DF;
  --red:#C2412D;
  --ok:#2F7D4F;
  --blue:#1F4FD1;          /* elektrotechnika */
  --green:#0D7653;         /* elektronika */
  --acc:var(--blue);
  --acc-soft:#E6EDFC;
  --acc-ink:#163C9E;
  --img-bg:#FFFFFF;
  --shadow:0 1px 0 rgba(22,34,44,.04),0 8px 24px -14px rgba(22,34,44,.25);
  --r-s:6px; --r-m:10px; --r-l:18px;
  --font-body:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-head:"Bricolage Grotesque","Atkinson Hyperlegible",system-ui,sans-serif;
  --top:64px;
  color-scheme:light;
}
html[data-section="elektronika"]{--acc:var(--green);--acc-soft:#E2F2EB;--acc-ink:#0A5A3F}

@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0E1418;--surface:#151E24;--ink:#E5ECEF;--ink-2:#C3CED4;--muted:#93A3AD;--line:#27343C;--line-2:#1E2930;
    --pad:#E2B04A;--pad-soft:#2A2414;--red:#F0826E;--ok:#6BCB93;
    --blue:#86A6FF;--green:#4FC995;--acc-soft:#1B2747;--acc-ink:#B7CAFF;--img-bg:#F4F6F5;
    --shadow:0 1px 0 rgba(0,0,0,.3),0 10px 30px -16px rgba(0,0,0,.7);color-scheme:dark;
  }
  :root:not([data-theme="light"])[data-section="elektronika"]{--acc-soft:#12322A;--acc-ink:#A9EBCF}
}
:root[data-theme="dark"]{
  --paper:#0E1418;--surface:#151E24;--ink:#E5ECEF;--ink-2:#C3CED4;--muted:#93A3AD;--line:#27343C;--line-2:#1E2930;
  --pad:#E2B04A;--pad-soft:#2A2414;--red:#F0826E;--ok:#6BCB93;
  --blue:#86A6FF;--green:#4FC995;--acc-soft:#1B2747;--acc-ink:#B7CAFF;--img-bg:#F4F6F5;
  --shadow:0 1px 0 rgba(0,0,0,.3),0 10px 30px -16px rgba(0,0,0,.7);color-scheme:dark;
}
:root[data-theme="dark"][data-section="elektronika"]{--acc-soft:#12322A;--acc-ink:#A9EBCF}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--top) + 16px)}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 var(--font-body);text-rendering:optimizeLegibility}
a{color:var(--acc);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--pad);outline-offset:2px;border-radius:4px}
img{max-width:100%;height:auto}
button,input,select{font:inherit;color:inherit}
.skip{position:absolute;left:-999px;top:8px;z-index:100;background:var(--ink);color:var(--surface);padding:8px 14px;border-radius:8px}
.skip:focus{left:12px}

/* ---------------- top bar ---------------- */
.topbar{position:sticky;top:0;z-index:40;height:var(--top);display:flex;align-items:center;gap:14px;padding:0 20px;
  background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-family:var(--font-head);font-weight:600;font-size:16px;white-space:nowrap}
.brand svg{width:36px;height:22px;fill:none;stroke:var(--acc);stroke-width:2.2;stroke-linejoin:round;stroke-linecap:round}
html:not([data-section]) .brand svg{stroke:var(--ink)}
.brand b{font-weight:700}
.switch{display:flex;background:var(--line-2);border-radius:999px;padding:3px;margin-left:8px}
.sw{padding:6px 14px;border-radius:999px;color:var(--muted);text-decoration:none;font-weight:700;font-size:14px;white-space:nowrap}
.sw:hover{color:var(--ink)}
.sw[aria-current]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.sw-elektrotechnika[aria-current]{color:var(--blue)}
.sw-elektronika[aria-current]{color:var(--green)}
.search{position:relative;margin-left:auto;width:min(360px,34vw)}
.search input{width:100%;height:40px;border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:0 38px 0 40px;outline:none}
.search input:focus{border-color:var(--acc);background:var(--surface);box-shadow:0 0 0 4px var(--acc-soft)}
.search-icon{position:absolute;left:13px;top:10px;width:20px;height:20px;color:var(--muted)}
.search-icon svg,.icon-btn svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.search kbd{position:absolute;right:12px;top:9px;font:12px/1 var(--font-body);border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:4px 7px;color:var(--muted);background:var(--surface)}
.search input:focus ~ kbd{display:none}
.search-results{position:absolute;right:0;top:48px;width:min(560px,92vw);max-height:min(70vh,560px);overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-m);box-shadow:var(--shadow);padding:6px}
.sr-item{display:block;padding:10px 12px;border-radius:8px;text-decoration:none;color:var(--ink)}
.sr-item:hover,.sr-item.active{background:var(--acc-soft)}
.sr-item .sr-t{font-weight:700;display:block}
.sr-item .sr-s{font-size:13px;color:var(--muted)}
.sr-item .sr-x{display:block;font-size:14px;color:var(--ink-2);margin-top:2px}
.sr-item mark{background:var(--pad-soft);color:inherit;border-radius:3px;padding:0 2px;box-shadow:inset 0 -2px 0 var(--pad)}
.sr-empty{padding:14px;color:var(--muted)}
.sr-tag{font-size:12px;font-weight:700;border-radius:999px;padding:1px 8px;margin-left:6px;background:var(--line-2);color:var(--ink-2)}
.icon-btn{width:40px;height:40px;border:1px solid transparent;border-radius:10px;background:none;display:grid;place-items:center;padding:9px;cursor:pointer;color:var(--ink-2);flex:none}
.icon-btn:hover{background:var(--line-2)}
.nav-toggle{display:none}

/* ---------------- layout ---------------- */
.layout{display:grid;grid-template-columns:300px minmax(0,1fr);max-width:1560px;margin:0 auto}
.sidebar{position:sticky;top:var(--top);height:calc(100vh - var(--top));overflow:auto;border-right:1px solid var(--line);scrollbar-width:thin}
.sidebar-inner{padding:22px 16px 40px 20px}
.sidebar-title{font-family:var(--font-head);font-weight:700;font-size:19px;margin:0 0 14px 10px;color:var(--acc)}
.nav,.nav ul{list-style:none;margin:0;padding:0}
.nav a{display:block;padding:6px 10px;border-radius:8px;color:var(--ink-2);text-decoration:none;font-size:15px;line-height:1.35}
.nav a:hover{background:var(--line-2);color:var(--ink)}
.nav a[aria-current="page"]{background:var(--acc-soft);color:var(--acc-ink);font-weight:700}
.nav a.sub{color:var(--muted);font-size:14px}
.nav a.sub:hover{color:var(--ink)}
.nav a small{display:block;font-size:12.5px;color:var(--muted);font-weight:400}
.nav-single{margin:2px 0}
.nav-group details{margin:2px 0}
.nav-group summary{list-style:none;cursor:pointer;padding:7px 10px;border-radius:8px;font-weight:700;font-size:15px;line-height:1.35;display:flex;gap:8px;align-items:flex-start;color:var(--ink)}
.nav-group summary::-webkit-details-marker{display:none}
.nav-group summary::before{content:"";flex:none;width:7px;height:7px;margin-top:7px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(-45deg);transition:transform .15s}
.nav-group details[open] > summary::before{transform:rotate(45deg)}
.nav-group summary:hover{background:var(--line-2)}
.nav-group ul{margin:2px 0 8px 13px;padding-left:10px;border-left:2px solid var(--line)}

.main{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:32px;padding:28px 32px 64px}
.doc{min-width:0;max-width:960px}
.doc-head{margin:6px 0 26px}
.crumb{margin:0 0 6px;font-size:14px;color:var(--muted)}
.crumb a{color:var(--muted);text-decoration:none}
.crumb a:hover{color:var(--acc)}
.crumb span::before{content:"/";margin:0 8px;opacity:.6}
.doc-head h1{font-family:var(--font-head);font-weight:750;font-size:clamp(32px,4.4vw,52px);line-height:1.04;letter-spacing:-.02em;margin:0;text-wrap:balance}
.doc-head h1::after{content:"";display:block;width:64px;height:5px;border-radius:3px;background:var(--acc);margin-top:18px}

.toc{position:relative}
.toc-inner{position:sticky;top:calc(var(--top) + 28px);max-height:calc(100vh - var(--top) - 56px);overflow:auto;font-size:14px}
.toc-title{font-weight:700;margin:0 0 8px;color:var(--ink)}
#toc{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
#toc a{display:block;padding:4px 10px;margin-left:-2px;border-left:2px solid transparent;color:var(--muted);text-decoration:none;line-height:1.35}
#toc a.lvl3{padding-left:22px;font-size:13px}
#toc a:hover{color:var(--ink)}
#toc a.active{border-left-color:var(--acc);color:var(--acc-ink);font-weight:700}
.toc.empty{visibility:hidden}

/* ---------------- prose (převzatý obsah) ---------------- */
.prose{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-l);padding:34px 40px;box-shadow:var(--shadow)}
.prose::after{content:"";display:block;clear:both}
.prose > :first-child, .prose > section:first-child > :first-child{margin-top:0}
.prose p,.prose li,.prose dd{max-width:none}
.prose p{margin:.75em 0}
.prose b,.prose strong{font-weight:700;color:var(--ink)}
.prose h2{font-family:var(--font-head);font-weight:700;font-size:30px;line-height:1.15;letter-spacing:-.01em;margin:1.4em 0 .5em;clear:both;padding-top:4px}
.prose h3{font-family:var(--font-head);font-weight:650;font-size:22px;line-height:1.25;margin:1.6em 0 .5em;clear:both}
.prose h4{font-size:18px;font-weight:700;margin:1.3em 0 .4em;color:var(--ink-2)}
.prose h2 a,.prose h3 a{color:inherit}
.prose ul,.prose ol{padding-left:1.4em;margin:.6em 0}
.prose li{margin:.25em 0}
.prose li::marker{color:var(--acc)}
.prose dl{margin:1em 0}
.prose dt{font-weight:700;margin-top:1em}
.prose dd{margin:.2em 0 0 0;padding-left:16px;border-left:3px solid var(--acc-soft)}
.prose sub,.prose sup{line-height:0}
.prose .lead{font-size:19px;color:var(--ink-2);line-height:1.6}

.chapter{position:relative}
.chapter + .chapter{margin-top:42px;padding-top:30px;border-top:1px solid var(--line)}
.chapter > h2:first-child{margin-top:0}

/* obrázky – „papírová“ podložka, aby GIFy s bílým pozadím seděly i v tmavém režimu */
.prose img{background:var(--img-bg);border-radius:4px;vertical-align:middle}
.prose .l,.prose .r{background:var(--img-bg);border:1px solid var(--line);border-radius:var(--r-m);padding:6px;margin:4px 0 14px}
.prose .l{float:left;margin-right:22px;clear:left;max-width:60%}
.prose .r{float:right;margin-left:22px;max-width:45%}
.prose .sl{float:left;margin:0 32px 12px 0;text-align:center}
.prose .gl{float:left;margin-right:18px}
.prose .ol{float:left;margin-right:24px}
.prose .cl,.prose .uobt{clear:both}
.prose div.cl{height:0}
.prose .big{margin:1.2em 0;text-align:center;clear:both}
.prose .md{text-align:center;padding-top:.8em}
.prose .center{text-align:center}
.prose .odsazeny{margin-left:1em}
.prose .vysledek{border:2px solid var(--pad);border-radius:var(--r-m);padding:8px;background:var(--img-bg);box-shadow:4px 4px 0 var(--pad-soft)}
.prose .rovnice{text-align:center;font-size:2em}
.prose .rovnobr{text-align:center;margin-top:1ex}
.prose .rovnicevt{font-family:"Times New Roman",Times,serif;font-size:1.25em;font-style:italic;white-space:nowrap}
.prose .jednotky{font-family:"Times New Roman",Times,serif;font-style:italic}
.prose .cislo{white-space:nowrap}
.prose .tcislo{white-space:nowrap;font-weight:700}
.prose .tenky{font-weight:400}
.prose ul.tenky li{margin-top:6px}
.prose .tlusty{font-weight:700}
.prose .tlusty p{font-weight:400}
.prose .calc{display:inline-block;white-space:nowrap;font-weight:700;font-size:15px;line-height:1.2;padding:4px 10px;margin:1px;border-radius:7px;background:var(--line-2);border:1px solid var(--line);border-bottom-width:3px;color:var(--ink)}
.prose .tl{display:inline-block;color:#fff;background:#3B4650;padding:1px 8px;border-radius:5px;font-weight:700}
.prose .caranad{text-decoration:overline}
.prose .hindex{vertical-align:super;font-size:80%}
.prose .dindex{vertical-align:sub;font-size:80%}
.prose .symbol{font-family:Symbol,serif}

/* plus / minus seznamy */
.prose ul.plus,.prose ul.minus{list-style:none;padding-left:0;font-weight:400}
.prose ul.plus li,.prose ul.minus li{position:relative;padding-left:34px;margin-top:.6em}
.prose ul.plus li::before,.prose ul.minus li::before{position:absolute;left:0;top:2px;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:16px;line-height:1}
.prose ul.plus li::before{content:"+";background:color-mix(in srgb,var(--ok) 16%,transparent);color:var(--ok)}
.prose ul.minus li::before{content:"−";background:color-mix(in srgb,var(--red) 16%,transparent);color:var(--red)}

/* callouty */
.prose .def_tit{clear:both;margin:24px 0 0;padding:10px 18px;border-radius:var(--r-m) var(--r-m) 0 0;background:var(--pad);color:#1d1503;font-weight:700;font-size:18px}
.prose .def{margin:0 0 24px;padding:14px 18px;border:2px solid var(--pad);border-top:0;border-radius:0 0 var(--r-m) var(--r-m);background:var(--pad-soft)}
.prose .pozor,.prose .prikladword,.prose .zeleny,.callout{border-radius:var(--r-m);padding:14px 18px;margin:16px 0;border-left:5px solid}
.prose .pozor{background:color-mix(in srgb,var(--red) 10%,var(--surface));border-color:var(--red);font-weight:700}
.prose .prikladword{background:var(--pad-soft);border-color:var(--pad);font-weight:700}
.prose .zeleny,.callout.note{background:var(--acc-soft);border-color:var(--acc)}
.callout p{margin:0}

/* tabulky */
.table-wrap{overflow-x:auto;margin:16px 0;clear:both;-webkit-overflow-scrolling:touch}
.prose table{border-collapse:separate;border-spacing:0;font-size:15.5px;line-height:1.5}
.prose td,.prose th{vertical-align:top;text-align:left}
.tbl-data{border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden;min-width:min(100%,360px)}
.tbl-data th{background:var(--acc-soft);color:var(--acc-ink);font-weight:700;padding:9px 14px;border-bottom:1px solid var(--line);text-align:center;vertical-align:middle}
.tbl-data td{padding:8px 14px;border-bottom:1px solid var(--line-2)}
.tbl-data tr:last-child td{border-bottom:0}
.tbl-data tr:nth-child(even) td{background:color-mix(in srgb,var(--paper) 55%,var(--surface))}
.tbl-data td + td,.tbl-data th + th{border-left:1px solid var(--line-2)}
.tbl-grid{border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden}
.tbl-grid > tbody > tr > td,.tbl-grid > tr > td,.tbl-grid > tbody > tr > th{padding:12px 14px;border-right:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.tbl-grid > tbody > tr > td:last-child{border-right:0}
.tbl-grid > tbody > tr:last-child > td{border-bottom:0}
.tbl-grid th{background:var(--acc-soft);color:var(--acc-ink);text-align:center}
.prose .caracenter,.prose td.caracenter{text-align:center;vertical-align:middle}
.prose td.centr,.prose tr.centr{text-align:center}
.prose td.stred{vertical-align:middle}
.prose td img{background:var(--img-bg)}
.prose table table{border:1px solid var(--line-2);border-radius:6px}
.prose table table td{padding:4px 8px}

/* odkazy se speciálním významem */
.sim-link,.video-link,.pdf-link,.download-link{text-decoration:none;font-weight:700}
.sim-link{display:inline-flex;align-items:center;gap:8px;padding:6px 14px 6px 10px;margin:4px 0;border-radius:999px;background:var(--acc-soft);color:var(--acc-ink)!important;border:1px solid color-mix(in srgb,var(--acc) 30%,transparent);line-height:1.3}
.sim-link::before{content:"";flex:none;width:20px;height:14px;background:currentColor;
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 24'%3E%3Cpath d='M1 12h7l2-6 4 12 4-12 4 12 4-12 2 6h11' fill='none' stroke='black' stroke-width='3' stroke-linejoin='round' stroke-linecap='round'/%3E%3C/svg%3E") center/contain no-repeat;
          mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 24'%3E%3Cpath d='M1 12h7l2-6 4 12 4-12 4 12 4-12 2 6h11' fill='none' stroke='black' stroke-width='3' stroke-linejoin='round' stroke-linecap='round'/%3E%3C/svg%3E") center/contain no-repeat}
.sim-link:hover{background:var(--acc);color:var(--surface)!important}
.sim-demo{pointer-events:none;font-size:14px;padding:2px 10px 2px 8px}
.video-link::before,.pdf-link::before,.download-link::before{display:inline-block;font-size:11px;font-weight:700;padding:1px 6px;margin-right:6px;border-radius:4px;vertical-align:2px;line-height:1.5}
.video-link::before{content:"▶ video";background:var(--red);color:#fff}
.pdf-link::before{content:"PDF";background:var(--ink-2);color:var(--surface)}
.download-link::before{content:"soubor";background:var(--line);color:var(--ink)}
.prose p.video-line{margin:.45em 0;font-size:16.5px}
.zoom-link{cursor:zoom-in}

/* videa */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px;margin:18px 0;clear:both}
.video-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden;background:var(--surface);transition:border-color .15s,transform .15s}
.video-card:hover{border-color:var(--acc);transform:translateY(-2px)}
.video-thumb{position:relative;display:grid;place-items:center;background:#0f1418;aspect-ratio:16/10;overflow:hidden}
.prose .video-thumb img{width:100%;height:100%;object-fit:cover;border-radius:0;background:#fff}
.play{position:absolute;width:52px;height:52px;border-radius:50%;background:rgba(15,20,24,.72);display:grid;place-items:center;box-shadow:0 0 0 3px rgba(255,255,255,.75)}
.play::after{content:"";border-left:16px solid #fff;border-top:10px solid transparent;border-bottom:10px solid transparent;margin-left:4px}
.video-card:hover .play{background:var(--red)}
.video-cap{padding:10px 12px 12px;font-size:14.5px;line-height:1.4;font-weight:700}

/* výsledky příkladů */
.prose ol.vypocty{font-weight:400;padding-left:1.6em}
.prose ol.vypocty > li{margin-top:1.2em;padding-left:6px}
.prose ol.vypocty > li::marker{font-weight:700;font-family:var(--font-head)}
details.answer{margin:8px 0 4px;text-align:left}
details.answer > summary{display:inline-flex;align-items:center;gap:8px;cursor:pointer;list-style:none;font-size:14px;font-weight:700;padding:3px 12px 3px 10px;border-radius:999px;border:1px dashed var(--pad);color:var(--ink-2);user-select:none}
details.answer > summary::-webkit-details-marker{display:none}
details.answer > summary::before{content:"?";display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--pad);color:#1d1503;font-size:12px}
details.answer[open] > summary{border-style:solid;background:var(--pad-soft)}
details.answer[open] > summary::before{content:"✓"}
.answer-body{display:inline-block;margin:6px 0 0 8px;padding:4px 12px;border-radius:8px;background:var(--pad-soft);font-weight:700;vertical-align:middle}
.answers-toggle{display:inline-flex;gap:8px;align-items:center;margin:6px 0 4px;padding:7px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);cursor:pointer;font-weight:700;font-size:14px}
.answers-toggle:hover{border-color:var(--pad)}

/* pager */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:28px}
.pn{display:block;padding:16px 20px;border:1px solid var(--line);border-radius:var(--r-m);text-decoration:none;color:var(--ink);background:var(--surface)}
.pn:hover{border-color:var(--acc)}
.pn small{display:block;color:var(--muted);font-size:13px}
.pn span{font-weight:700;font-family:var(--font-head);font-size:18px;color:var(--acc-ink)}
.pn.next{text-align:right;grid-column:2}
.pn.prev::before{content:"←";float:left;margin-right:12px;font-size:22px;color:var(--muted)}
.pn.next::after{content:"→";float:right;margin-left:12px;font-size:22px;color:var(--muted)}

.foot{border-top:1px solid var(--line);padding:22px 20px 34px;text-align:center;color:var(--muted);font-size:14px}
.foot p{margin:2px 0}

/* osobnosti / časová osa */
.people{display:grid;gap:18px;margin-top:16px}
.person{display:grid;grid-template-columns:140px 1fr;gap:20px;align-items:start;padding:16px;border:1px solid var(--line);border-radius:var(--r-m)}
.person img{width:140px;border-radius:8px}
.person h3{margin:0!important}
.person .years{margin:2px 0 6px!important;color:var(--muted);font-weight:700}
.timeline{list-style:none;padding:0!important;margin:20px 0;position:relative}
.timeline::before{content:"";position:absolute;left:62px;top:6px;bottom:6px;width:2px;background:var(--line)}
.timeline li{display:grid;grid-template-columns:52px 1fr;gap:28px;margin:0 0 14px!important;position:relative}
.timeline li::after{content:"";position:absolute;left:57px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--surface);border:3px solid var(--acc)}
.timeline .year{font-family:var(--font-head);font-weight:700;color:var(--acc-ink);text-align:right}

/* galerie */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:20px}
.gallery-item{margin:0;border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden;background:var(--surface)}
.gallery-item img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:0}
.gallery-item figcaption{padding:10px 12px;font-weight:700}

/* lightbox & video modal */
.modal{position:fixed;inset:0;z-index:90;background:rgba(8,12,15,.86);display:grid;place-items:center;padding:24px}
.modal[hidden]{display:none}
.modal img,.modal video{max-width:min(1200px,100%);max-height:calc(100vh - 100px);border-radius:10px;background:#fff}
.modal video{background:#000}
.modal figcaption{color:#e8eef0;text-align:center;margin-top:10px}
.modal-close{position:absolute;top:16px;right:16px;width:44px;height:44px;border-radius:50%;border:0;background:rgba(255,255,255,.14);color:#fff;font-size:26px;cursor:pointer}
.modal-close:hover{background:rgba(255,255,255,.28)}

/* ---------------- nástroje ---------------- */
.tool{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px;align-items:start}
.tool-title{font-family:var(--font-head);font-size:22px!important;margin:0 0 14px!important}
.tool-controls{display:grid;gap:14px;padding:22px;border:1px solid var(--line);border-radius:var(--r-m);background:color-mix(in srgb,var(--paper) 50%,var(--surface))}
.slider{display:grid;grid-template-columns:1fr auto auto;align-items:baseline;gap:4px 8px}
.slider input{grid-column:1/-1;grid-row:2}
.slider input{accent-color:var(--acc);width:100%}
.slider output{text-align:right;font-weight:700;font-variant-numeric:tabular-nums}
.unit{color:var(--muted);font-size:14px}
.result{display:flex;gap:10px;align-items:baseline;padding:12px 16px;border-radius:var(--r-m);background:var(--surface);border:2px solid var(--pad)}
.result output{font-family:var(--font-head);font-size:30px;font-weight:700;font-variant-numeric:tabular-nums}
.result.big output{font-size:34px}
meter{width:100%;height:14px}
.tool-visual{margin:0;padding:16px;border:1px solid var(--line);border-radius:var(--r-m);background:var(--img-bg);color:#16222C}
.tool-visual svg{width:100%;height:auto;display:block}
.tool-visual.small{max-width:240px;text-align:center}
.tool-visual.small figcaption{font-weight:700;margin-top:6px}
.tool-visual.wide{grid-column:1/-1}
.tool-visual.wide .result{max-width:420px;margin:12px auto 0;background:#fff;color:#16222C}
.field{display:grid;grid-template-columns:120px 1fr 60px;align-items:center;gap:10px}
.field input,.field select,.band select{height:42px;border:1px solid var(--line);border-radius:8px;padding:0 12px;background:var(--surface);width:100%}
.field input:focus,.field select:focus,.band select:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 4px var(--acc-soft)}
.field input[readonly]{background:var(--line-2)}
.seg{display:flex;gap:6px;border:0;padding:0;margin:0;flex-wrap:wrap}
.seg legend{float:left;width:120px;padding-top:8px;margin-right:10px}
.seg label{cursor:pointer}
.seg input{position:absolute;opacity:0}
.seg span{display:inline-block;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);font-weight:700;font-size:15px}
.seg input:checked + span{background:var(--acc);border-color:var(--acc);color:var(--surface)}
.seg input:focus-visible + span{outline:3px solid var(--pad);outline-offset:2px}
.tool-controls.bands{grid-column:1/-1;grid-template-columns:repeat(4,minmax(0,1fr))}
.band{display:grid;gap:8px}
.band-label{font-weight:700}
.source{font-size:14px;color:var(--muted);margin-top:18px!important}

/* ---------------- responsivita ---------------- */
@media (max-width:1240px){
  .main{grid-template-columns:minmax(0,1fr)}
  .toc{display:none}
}
@media (max-width:980px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .nav-toggle{display:grid}
  .sidebar{position:fixed;z-index:60;top:0;left:0;bottom:0;height:100vh;width:min(340px,88vw);background:var(--surface);transform:translateX(-102%);transition:transform .22s ease;box-shadow:var(--shadow)}
  .sidebar.open{transform:none}
  .nav-scrim{position:fixed;inset:0;z-index:55;background:rgba(8,12,15,.45)}
  .main{padding:20px 18px 48px}
  .prose{padding:24px 22px}
  .brand span{display:none}
  .search{width:auto;flex:1;min-width:0}
  .search kbd{display:none}
  .tool{grid-template-columns:1fr}
}
@media (max-width:720px){
  body{font-size:16.5px}
  .topbar{gap:8px;padding:0 10px}
  .switch{margin-left:0}
  .sw{padding:6px 10px;font-size:13px}
  .search input{padding-right:12px}
  .main{padding:14px 10px 40px}
  .prose{padding:20px 16px;border-radius:var(--r-m)}
  .prose .l,.prose .r,.prose .sl,.prose .gl,.prose .ol{float:none;display:block;margin:10px auto 14px;max-width:100%}
  .prose h2{font-size:25px}
  .prose h3{font-size:20px}
  .pager{grid-template-columns:1fr}
  .pn.next{grid-column:1}
  .person{grid-template-columns:90px 1fr;gap:14px}
  .person img{width:90px}
  .field{grid-template-columns:1fr 56px}
  .field > span:first-child{grid-column:1/-1}
  .seg legend{float:none;width:auto}
  .tool-controls.bands{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .search{flex:0 0 40px;width:40px;margin-left:auto}
  .search input{padding:0 0 0 40px;cursor:pointer;background:transparent;border-color:transparent}
  .search input::placeholder{color:transparent}
  .search-icon{left:10px}
  .search:focus-within{position:absolute;left:10px;right:10px;width:auto;z-index:5}
  .search:focus-within input{background:var(--surface);border-color:var(--acc);cursor:text;padding-right:12px}
  .search:focus-within input::placeholder{color:var(--muted)}
  .search-results{right:0;left:0;width:auto}
}
@media (max-width:440px){
  .brand{display:none}
  .sw{padding:6px 10px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}
@media print{
  .topbar,.sidebar,.toc,.pager,.foot,.nav-scrim{display:none!important}
  .layout,.main{display:block}
  .prose{border:0;box-shadow:none;padding:0}
  details.answer > .answer-body{display:inline-block}
}

.h1-sym{display:inline-block;vertical-align:middle;margin-left:18px}
.h1-sym img{background:var(--img-bg);border-radius:8px;padding:4px;height:auto;max-height:56px;width:auto}