:root{
  /* přírodovědná paleta — zelenotyrkysová, svěží a klidná */
  --ink:#18261f; --muted:#5d6d63; --line:#dce7df;
  --paper:#eef4ee; --card:#ffffff; --stone:#163a31;
  --accent:#11897a; --accent-d:#0b6a5e;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --radius:16px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
html,body{margin:0}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);
  line-height:1.55;-webkit-font-smoothing:antialiased}
.wrap{max-width:1100px;margin:0 auto;padding:0 max(20px,env(safe-area-inset-left))}
a{color:var(--accent-d)}

/* header */
.top{background:var(--stone);color:#fff;padding:18px 0;position:sticky;top:0;z-index:20;
  box-shadow:0 2px 14px -6px rgba(0,0,0,.4)}
.top .wrap{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.brand{font-family:var(--serif);font-weight:600;font-size:1.2rem;margin:0}
.brand span{display:block;font-family:var(--sans);font-weight:400;font-size:.72rem;
  letter-spacing:.14em;text-transform:uppercase;opacity:.8;margin-top:2px}

/* ---- brand lockup (logo + wordmark) ---- */
.brandlock{display:flex;align-items:center;gap:13px}
.brandlock .mark{flex:none;width:50px;height:26px;background-color:currentColor;
  -webkit-mask:url(/assets/img/wr-logo.svg) no-repeat left center/contain;
          mask:url(/assets/img/wr-logo.svg) no-repeat left center/contain}
.brandlock .txt{font-family:var(--serif);font-weight:600;font-size:1.18rem;line-height:1.05}
.brandlock .txt span{display:block;font-family:var(--sans);font-weight:400;font-size:.7rem;
  letter-spacing:.12em;text-transform:uppercase;opacity:.78;margin-top:3px}
.brandlock.grey{color:#56655c}

/* ---- password reveal ---- */
.pwwrap{position:relative;display:block}
.pwwrap input{padding-right:46px}
.pweye{position:absolute;right:6px;top:50%;transform:translateY(-50%);background:none;border:0;
  cursor:pointer;color:var(--muted);padding:8px;display:inline-flex;border-radius:8px;line-height:0}
.pweye:hover{color:var(--stone);background:rgba(0,0,0,.04)}

/* ---- ikony a chipy knihoven ---- */
.libchips{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.libchip{display:inline-flex;align-items:center;gap:7px;background:#fff;border:1px solid var(--line);
  border-radius:999px;padding:6px 13px;font-size:.85rem;font-weight:600;color:var(--stone)}
.libchip .i{display:inline-flex;line-height:0}
.libchip .i svg{width:18px;height:18px}
.libicon{display:inline-flex;width:42px;height:42px;align-items:center;justify-content:center;
  border-radius:12px;background:color-mix(in srgb,currentColor 14%,transparent);flex:none}
.libicon svg{width:24px;height:24px}
.top .spacer{flex:1}
.lang{font-size:.78rem;opacity:.85;border:1px solid rgba(255,255,255,.3);
  border-radius:999px;padding:5px 12px}
.langsel{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.28);
  border-radius:999px;padding:6px 11px;font:inherit;font-size:.82rem;cursor:pointer}
.langsel option{color:#1c1a17}

/* knihovny grid */
main.wrap{padding-top:44px;padding-bottom:64px}
.intro{margin:0 0 26px;max-width:60ch;color:#39342e}
.libs{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px}
.lib{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;cursor:pointer;text-align:left;font:inherit;color:inherit;
  transition:transform .12s ease,box-shadow .2s ease;position:relative;overflow:hidden}
.lib:hover{transform:translateY(-2px);box-shadow:0 14px 36px -18px rgba(40,30,20,.4)}
.lib .bar{position:absolute;left:0;top:0;bottom:0;width:6px}
.lib .head{display:flex;align-items:center;gap:12px;padding-left:8px;margin-bottom:8px}
.lib h2{font-family:var(--serif);font-size:1.4rem;margin:0;padding:0}
.lib p{font-size:.9rem;color:var(--muted);margin:0 0 16px;padding-left:8px}
.lib .count{padding-left:8px;font-size:.82rem;font-weight:600}
.lib .meter{height:7px;background:var(--line);border-radius:999px;margin:8px 0 0 8px;overflow:hidden}
.lib .meter i{display:block;height:100%;border-radius:999px}

/* jednotky grid */
.crumbs{display:flex;align-items:center;gap:12px;margin:0 0 20px;flex-wrap:wrap}
.crumb-back{display:inline-flex;align-items:center;gap:7px;background:var(--card);border:1px solid var(--line);
  color:var(--accent-d);cursor:pointer;font:inherit;font-weight:600;font-size:.9rem;
  padding:8px 15px 8px 12px;border-radius:999px;transition:background .15s,color .15s,border-color .15s}
.crumb-back:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.crumb-back svg{width:16px;height:16px}
.crumb-cur{font-family:var(--serif);font-weight:600;font-size:1.25rem;color:var(--ink);line-height:1}
.crumb-count{font-size:.78rem;font-weight:600;color:var(--accent-d);background:color-mix(in srgb,var(--accent) 12%,transparent);
  padding:4px 11px;border-radius:999px}
.filterbar{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 18px}
.filterbar input,.filterbar select{padding:11px 14px;border:1px solid var(--line);border-radius:10px;font:inherit;background:#fff}
.filterbar input{flex:1;min-width:200px}
.filterbar select{min-width:180px}
.units{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.unit{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;
  cursor:pointer;font:inherit;color:inherit;text-align:left;transition:transform .12s,box-shadow .2s}
.unit:hover{transform:translateY(-2px);box-shadow:0 14px 36px -18px rgba(40,30,20,.4)}
.unit .thumb{height:140px;background:#ece8e1 center/cover;display:flex;align-items:center;
  justify-content:center;color:#b7afa3;font-size:.8rem}
.unit .body{padding:14px}
.unit .tema{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-d);margin:0 0 4px}
.unit h3{font-size:1.05rem;margin:0 0 10px}
.badges{display:flex;flex-wrap:wrap;gap:6px}
.badge{font-size:.68rem;font-weight:600;padding:3px 9px;border-radius:999px;
  background:#eef1f6;color:#3a4a66;border:1px solid #dde3ee}
.badge.demo{background:#e7f5ec;color:#1d6b3c;border-color:#cfe9d8}
.badge.todo{background:#f3efe6;color:#8a6d3b;border-color:#e6dcc7}
.badge.hotovo{background:#1d6b3c;color:#fff;border-color:#1d6b3c}

/* dokončeno – tlačítko ve vieweru */
.donebar{margin-top:18px}
.donebtn{appearance:none;border:1.5px solid var(--accent);background:#fff;color:var(--accent-d);
  font:inherit;font-weight:600;padding:12px 22px;border-radius:999px;cursor:pointer;
  display:inline-flex;align-items:center;gap:8px;transition:background .15s,color .15s}
.donebtn:hover{background:#eef2fb}
.donebtn.is-done{background:#1d6b3c;border-color:#1d6b3c;color:#fff}
.donebtn.is-done:hover{background:#18592f}

/* teorie */
.theory{margin-top:22px}
.theory h3{font-family:var(--sans);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin:0 0 8px}
.theory p{margin:0 0 12px;color:#39342e}

/* Věděli jste? */
.dyk{margin-top:20px}
.dyk-btn{display:inline-flex;align-items:center;gap:9px;cursor:pointer;font:inherit;font-weight:600;
  background:#fff7e0;color:#8a6a12;border:1px solid #f0e2b0;border-radius:999px;padding:11px 18px}
.dyk-btn:hover{background:#fdefc8}
.dyk-btn .bulb{display:inline-flex;line-height:0;color:#e0a500}
.dyk-btn.open{background:#fdefc8}
.dyk-body{margin-top:12px;background:#fffaf0;border:1px solid #f0e2b0;border-left:4px solid #e0a500;
  border-radius:0 12px 12px 0;padding:14px 18px}
.dyk-body p{margin:0 0 10px;color:#5c4a16}
.dyk-body p:last-child{margin-bottom:0}

/* hotspoty na 3D modeli */
.hotspot{--sz:26px;background:none;border:0;cursor:pointer;padding:0;position:relative;
  transition:opacity .2s}
/* body za modelem jemně ztlumíme, ale necháme viditelné (model-viewer toggluje [visible]) */
.hotspot:not([visible]){opacity:.45}
.hs-dot{display:flex;width:var(--sz);height:var(--sz);align-items:center;justify-content:center;
  border-radius:50%;background:var(--accent);color:#fff;font-size:.76rem;font-weight:700;
  border:2px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.4)}
.hs-bubble{display:none;position:absolute;left:50%;top:calc(var(--sz) + 8px);transform:translateX(-50%);
  width:220px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px;
  box-shadow:0 12px 34px -12px rgba(0,0,0,.45);text-align:left;z-index:10}
.hs-bubble b{display:block;margin-bottom:4px;color:var(--stone)}
.hs-bubble span{font-size:.85rem;color:#39342e;line-height:1.4}
.hotspot.open{z-index:20}
.hotspot.open .hs-bubble{display:block}
.hotspot.open .hs-dot{background:var(--accent-d)}

/* kvíz */
.quiz{margin-top:24px;border-top:1px solid var(--line);padding-top:18px}
.quiz h3{font-family:var(--sans);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin:0 0 12px}
.quiz .q{margin:0 0 16px}
.quiz .qq{font-weight:600;margin:0 0 8px}
.quiz .opts{display:flex;flex-direction:column;gap:7px}
.quiz .opt{display:flex;align-items:center;gap:9px;background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:10px 13px;cursor:pointer;font-size:.92rem}
.quiz .opt:hover{border-color:var(--accent)}
.quiz .opt.ok{background:#e7f5ec;border-color:#1d6b3c}
.quiz .opt.bad{background:#f7e3e0;border-color:#a8392c}
.quizbtn{margin-top:6px;background:var(--accent);color:#fff;border:0;border-radius:999px;
  padding:11px 22px;font:inherit;font-weight:600;cursor:pointer}
.quizbtn:hover{background:var(--accent-d)}
.quizres{margin-top:12px;font-size:.95rem}
.quizres.pass{color:#1d6b3c}
.quizres.fail{color:#a8392c}

/* viewer modal */
.modal{position:fixed;inset:0;z-index:40;background:rgba(20,18,16,.55);
  display:none;align-items:stretch;justify-content:center}
.modal.open{display:flex}
.sheet{background:var(--paper);width:min(960px,100%);max-height:100%;overflow:auto;
  border-radius:0;display:flex;flex-direction:column}
@media(min-width:980px){.sheet{margin:24px;border-radius:var(--radius);max-height:calc(100% - 48px)}}
.sheet header{display:flex;align-items:flex-start;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line);
  position:sticky;top:0;background:var(--paper);z-index:2}
.sheet header .tema{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-d);margin:0}
.sheet header h2{font-family:var(--serif);font-size:1.5rem;margin:2px 0 0}
.sheet header .x{margin-left:auto;background:var(--stone);color:#fff;border:0;border-radius:999px;
  width:40px;height:40px;font-size:1.2rem;cursor:pointer;flex:none}
.tabs{display:flex;gap:6px;flex-wrap:wrap;padding:14px 20px 0}
.tab{background:#eef1f6;border:1px solid #dde3ee;border-radius:999px;padding:8px 16px;
  cursor:pointer;font:inherit;font-weight:600;font-size:.88rem;color:#3a4a66}
.tab.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.stage{padding:18px 20px 24px}
.pane{display:none}
.pane.active{display:block}
model-viewer{width:100%;height:clamp(320px,52vh,520px);background:#ece8e1;border-radius:12px;display:block}
.zoomwrap{position:relative}
#osd{width:100%;height:clamp(320px,52vh,520px);background:#111;border-radius:12px}
.zoomctl{position:absolute;left:12px;top:12px;display:flex;flex-direction:column;gap:6px;z-index:5}
.zoomctl button{width:40px;height:40px;border:0;border-radius:9px;background:rgba(20,18,16,.66);
  color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;
  backdrop-filter:blur(4px);transition:background .15s}
.zoomctl button:hover{background:rgba(20,18,16,.9)}
.zoomctl button:active{transform:scale(.94)}
.pane video{width:100%;border-radius:12px;background:#000}
.desc{color:#39342e;margin:16px 0 0}
.empty{padding:50px 20px;text-align:center;color:var(--muted);background:var(--card);
  border:1px dashed var(--line);border-radius:12px}
.note{font-size:.84rem;color:var(--muted);background:#f0ece4;border-left:3px solid var(--accent);
  padding:12px 16px;border-radius:0 10px 10px 0;margin:16px 0 0}

footer{border-top:1px solid var(--line);color:var(--muted);font-size:.84rem;padding:24px 0 50px}