:root{
  --ink:#0F1A18;          /* dunkler Hintergrund, damit die Buchseite leuchtet */
  --ink-soft:#1B2A27;
  --line:#2C3E3A;
  --paper:#FFFFFF;
  --gold:#D2A24C;
  --gold-dim:rgba(210,162,76,.28);
  --text:#EAF0EE;
  --text-dim:#9BAFAA;
  --radius:14px;
  --bar:52px;
}

*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%}
body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  overscroll-behavior:none;
  -webkit-tap-highlight-color:transparent;
  display:flex;
  flex-direction:column;
}

/* ---------- Leisten ---------- */
.bar{
  display:flex;
  align-items:center;
  gap:8px;
  padding:0 8px;
  min-height:var(--bar);
  background:var(--ink-soft);
  flex:0 0 auto;
}
.bar-top{padding-top:env(safe-area-inset-top);border-bottom:1px solid var(--line)}
.bar-bottom{padding-bottom:env(safe-area-inset-bottom);border-top:1px solid var(--line)}
.title{flex:1;text-align:center;line-height:1.15}
.title .sub{display:block;font-size:12px;color:var(--text-dim)}

.icon-btn{
  width:40px;height:40px;flex:0 0 auto;
  display:grid;place-items:center;
  border:0;border-radius:10px;
  background:transparent;color:var(--text);
  cursor:pointer;
}
.icon-btn svg{width:22px;height:22px;fill:currentColor}
.icon-btn:active{background:#ffffff14}
.icon-btn[aria-pressed="false"]{color:var(--text-dim)}
.icon-btn:focus-visible,.text-btn:focus-visible,.wide-btn:focus-visible{outline:2px solid var(--gold);outline-offset:2px}

#slider{flex:1;accent-color:var(--gold);height:28px}

/* ---------- Seite ---------- */
#viewer{
  flex:1 1 auto;
  min-height:0;
  display:grid;
  place-items:center;
  padding:6px;
  position:relative;
  touch-action:pan-y;
}
#stage{
  position:relative;
  /* Größe wird in JS exakt berechnet, damit die Hörpunkte sitzen */
  background:var(--paper);
  border-radius:6px;
  overflow:hidden;
  box-shadow:0 10px 30px #0008;
  line-height:0;
}
#page-img{
  display:block;
  width:100%;height:100%;
  user-select:none;
}
#spots{position:absolute;inset:0}
.spot{
  position:absolute;
  border:0;padding:0;margin:0;
  background:transparent;
  border-radius:8px;
  cursor:pointer;
}
body.show-spots .spot{
  background:var(--gold-dim);
  box-shadow:inset 0 0 0 1.5px rgba(210,162,76,.65);
}
.spot.playing{
  background:rgba(210,162,76,.45);
  box-shadow:inset 0 0 0 2px var(--gold);
}
.spot.rich::after{
  content:"";
  position:absolute;right:3px;top:3px;
  width:9px;height:9px;border-radius:50%;
  background:var(--gold);
  box-shadow:0 0 0 2px #fff9;
}
#loading{position:absolute;color:var(--text-dim);font-size:14px}

/* ---------- Panels ---------- */
.panel{
  position:fixed;inset:0;z-index:20;
  background:var(--ink);
  display:flex;flex-direction:column;
  padding-top:env(safe-area-inset-top);
}
.panel-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 14px;border-bottom:1px solid var(--line);
}
.panel-head h2{margin:0;font-size:17px;font-weight:600}
.text-btn{
  border:0;background:transparent;color:var(--gold);
  font-size:15px;padding:8px;cursor:pointer;
}
.thumbs{
  flex:1;overflow-y:auto;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));
  gap:10px;padding:14px;
}
.thumb{border:0;background:transparent;padding:0;cursor:pointer;color:var(--text-dim);font-size:12px}
.thumb img{width:100%;border-radius:6px;background:#fff;aspect-ratio:1413/2000;object-fit:cover}
.thumb.current img{outline:2px solid var(--gold);outline-offset:2px}
.thumb span{display:block;margin-top:4px}

.menu-body{padding:16px;display:flex;flex-direction:column;gap:12px}
.wide-btn{
  width:100%;padding:14px;border:0;border-radius:var(--radius);
  background:var(--gold);color:#22190A;font-size:16px;font-weight:600;cursor:pointer;
}
.wide-btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
.note{color:var(--text-dim);font-size:13px;margin:0;line-height:1.5}
.progress{height:8px;border-radius:99px;background:var(--ink-soft);overflow:hidden}
.progress div{height:100%;width:0;background:var(--gold);transition:width .2s}

/* ---------- Aktivitäts-Overlay ---------- */
#overlay{
  position:fixed;inset:0;z-index:30;
  background:#07100Ff2;
  display:flex;flex-direction:column;
  padding-top:env(safe-area-inset-top);
  padding-bottom:env(safe-area-inset-bottom);
}
.overlay-head{
  display:flex;align-items:center;justify-content:space-between;
  gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);
}
.overlay-head span{font-size:14px;color:var(--text-dim);flex:1}
#overlay-body{
  flex:1;overflow:auto;padding:14px;
  display:flex;flex-direction:column;gap:14px;align-items:center;
}
#overlay-body img{max-width:100%;border-radius:8px;background:#fff}
#overlay-body video{max-width:100%;border-radius:8px}
.directive{
  color:var(--text-dim);font-size:14px;line-height:1.5;
  max-width:60ch;text-align:center;margin:0;
}

/* Zuordnungs-Aufgaben */
.match{display:grid;grid-template-columns:1fr 1fr;gap:10px;width:100%;max-width:640px}
.match-col{display:flex;flex-direction:column;gap:8px}
.card{
  border:1px solid var(--line);border-radius:12px;background:var(--ink-soft);
  color:var(--text);padding:10px;min-height:56px;cursor:pointer;
  display:grid;place-items:center;font-size:15px;
}
.card img{max-height:64px;width:auto}
.card.sel{border-color:var(--gold);background:#D2A24C22}
.card.done{opacity:.45;pointer-events:none;border-style:dashed}
.card.wrong{animation:shake .3s}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}

/* Quiz */
.quiz{width:100%;max-width:520px;display:flex;flex-direction:column;gap:10px}
.quiz .q{font-size:17px;line-height:1.5;text-align:center;margin:6px 0 4px}
.quiz .opt{
  padding:14px;border-radius:12px;border:1px solid var(--line);
  background:var(--ink-soft);color:var(--text);font-size:16px;cursor:pointer;text-align:center;
}
.quiz .opt.right{border-color:#5FBF7E;background:#5FBF7E22}
.quiz .opt.wrong{border-color:#C9564F;background:#C9564F22}

/* Memory */
.memory{display:grid;gap:8px;width:100%;max-width:560px}
.memory .card{aspect-ratio:1;min-height:0}
.memory .card.hidden-face{background:var(--gold);}
.memory .card.hidden-face img{visibility:hidden}

/* Schrittsteuerung */
.stepper{display:flex;align-items:center;gap:14px}
.stepper .count{color:var(--text-dim);font-size:14px;min-width:70px;text-align:center}

/* Vergleichen */
.compare{position:relative;width:100%;max-width:620px}
.compare img{width:100%;display:block}
.compare .layer{position:absolute;inset:0;overflow:hidden}
.compare input[type=range]{width:100%;margin-top:10px;accent-color:var(--gold)}

#autosave{
  position:fixed;left:50%;transform:translateX(-50%);
  bottom:calc(var(--bar) + 14px);
  width:min(420px,calc(100vw - 28px));
  display:flex;align-items:center;gap:10px;
  background:var(--ink-soft);border:1px solid var(--line);
  border-radius:var(--radius);padding:10px 12px;z-index:40;
  box-shadow:0 8px 24px #0006;
}
#autosave .autosave-text{flex:1;font-size:13px;color:var(--text-dim);min-width:0}
#autosave .progress{width:90px;flex:0 0 auto}
#autosave .text-btn{padding:4px 6px;font-size:13px}

#toast{
  position:fixed;left:50%;bottom:calc(var(--bar) + 18px);transform:translateX(-50%);
  background:#000C;color:#fff;padding:10px 16px;border-radius:99px;font-size:14px;z-index:50;
}

@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}