/* Układ: jedna kolumna jak talia na biurku; karta z ryciną-plakietką, akcje pod kciukiem */
:root{
  --bg:#edf1f0; --surface:#ffffff; --ink:#16212a; --muted:#56656e; --line:#d2dbdb;
  --accent:#0f5e66; --accent-soft:#dbecec; --arrow:#0a74e8;
  --known:#2d7a4d; --known-soft:#dff1e6; --again:#a8520c; --again-soft:#f8e8d8;
  --plate:#ffffff;
  --f-display:"Bricolage Grotesque","Segoe UI",system-ui,sans-serif;
  --f-body:"Atkinson Hyperlegible","Segoe UI",system-ui,sans-serif;
  --f-latin:"Literata",Georgia,"Times New Roman",serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0f161a; --surface:#172126; --ink:#e5edef; --muted:#93a6ad; --line:#2a3a40;
  --accent:#5fc2c9; --accent-soft:#163238; --arrow:#2b8cff;
  --known:#6fcf97; --known-soft:#16301f; --again:#f0a35e; --again-soft:#3a2614;
  --plate:#f4f2ec; color-scheme:dark}}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:16px/1.5 var(--f-body);-webkit-tap-highlight-color:transparent;
  padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
button{font:inherit;color:inherit;cursor:pointer}
button:focus-visible,.card:focus-visible{outline:3px solid var(--arrow);outline-offset:3px}

.top{background:var(--surface);border-bottom:1px solid var(--line);padding-block:14px 0;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.top>*{max-width:560px;margin-inline:auto}
.brand h1{font:800 26px/1.05 var(--f-display);margin:0;letter-spacing:-.01em}
.brand h1 span{color:var(--accent)}
.sub{margin:2px 0 10px;color:var(--muted);font-size:14px}
.tabs{display:flex;gap:4px}
.tabs button{flex:1;background:none;border:0;border-bottom:3px solid transparent;padding:10px 4px 9px;font-weight:700;color:var(--muted)}
.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--accent)}

.wrap{max-width:560px;margin:0 auto;padding-block:14px 32px;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));
  display:flex;flex-direction:column;gap:14px}
.controls{display:flex;flex-wrap:wrap;gap:8px 14px;justify-content:space-between}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:5px 12px;font-size:14px}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--surface)}

.progress p{margin:6px 0 0;font-size:14px;color:var(--muted);font-variant-numeric:tabular-nums}
.bar{height:6px;background:var(--line);border-radius:3px;overflow:hidden}
.bar span{display:block;height:100%;width:0;background:var(--known);transition:width .3s}

.stage{perspective:1400px}
.card{position:relative;width:100%;min-height:min(132vw,620px);transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.7,.2,1);cursor:pointer;outline:none}
.card.flipped{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--surface);border:1px solid var(--line);
  border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:10px;overflow-y:auto}
.back{transform:rotateY(180deg)}
.meta{display:flex;justify-content:space-between;gap:8px;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.meta .st{font-weight:700}
.meta .st.k{color:var(--known)} .meta .st.a{color:var(--again)}
.q{font:600 21px/1.25 var(--f-display);margin:0;text-wrap:balance}
.fh{flex:1 1 auto;min-height:150px;position:relative}
.fig{position:absolute;inset:0;background:var(--plate);border-radius:10px;overflow:hidden}
.fig svg{width:100%;height:100%;display:block}
.fig.schema svg{padding:6px}
.name{font:800 24px/1.15 var(--f-display);margin:0;text-wrap:balance}
.lat{font:italic 500 18px/1.3 var(--f-latin);color:var(--accent);margin:0}
.ans{margin:0;font-size:16px;line-height:1.5}
.ans ul{margin:0;padding-left:18px}
.hintline{text-align:center;color:var(--muted);font-size:13px;margin:8px 0 0}

.actions{display:grid;grid-template-columns:44px 1fr 1fr 44px;gap:8px}
.nav{border:1px solid var(--line);background:var(--surface);border-radius:10px;font-size:24px;line-height:1}
.mark{border:0;border-radius:10px;padding:13px 8px;font-weight:700;font-size:16px}
.mark.again{background:var(--again-soft);color:var(--again)}
.mark.known{background:var(--known-soft);color:var(--known)}
.mark:active,.nav:active{transform:translateY(1px)}
.keys{margin:0;text-align:center;font-size:12px;color:var(--muted)}
@media (hover:none){.keys{display:none}}

.done{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center}
.done h2{font:700 19px/1.25 var(--f-display);margin:0 0 6px;text-wrap:balance}
.done p{margin:0 0 12px;color:var(--muted)}

.foot{border-top:1px solid var(--line);padding-top:12px;font-size:13px;color:var(--muted)}
.foot p{margin:0 0 8px;max-width:65ch}
.src{font-size:12px}
.linkbtn{background:none;border:0;padding:0;color:var(--accent);text-decoration:underline;font-size:13px}

/* rysunek strzałki i podświetlenie w schematach */
.arrow-line{stroke:var(--arrow);fill:none;stroke-linecap:round}
.arrow-halo{stroke:#fff;fill:none;stroke-linecap:round}
.arrow-head{fill:var(--arrow);stroke:#fff}
.arrow-dot{fill:#fff;stroke:var(--arrow)}
.fig.schema .hl{filter:drop-shadow(0 0 3px var(--arrow)) drop-shadow(0 0 1px var(--arrow))}
.fig.schema .dim{opacity:.55}

@media (prefers-reduced-motion:reduce){.card{transition:none}.bar span{transition:none}}
@media (min-width:600px){.card{min-height:600px}}