:root{
  --red:#d52b1e;--bg:#f2f2f7;--card:#fff;--card2:#f7f7fa;--text:#1c1c1e;--sub:#6b6b70;
  --line:#e2e2e7;--green:#2fa84f;--wrong:#e0413a;--blue:#2b6cb0;--radius:18px;
}
@media (prefers-color-scheme:dark){:root{--bg:#000;--card:#1c1c1e;--card2:#2c2c2e;--text:#fff;--sub:#9a9aa0;--line:#2c2c2e;}}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;}
#app{max-width:600px;margin:0 auto;padding:16px calc(16px + env(safe-area-inset-left)) 96px;}
h1{font-size:1.55rem;margin:.3rem 0;}
h2{font-size:1.2rem;margin:0;}
p{line-height:1.45;}
button{font:inherit;cursor:pointer;border:none;border-radius:14px;padding:14px 16px;background:var(--card);color:var(--text);width:100%;text-align:left;transition:transform .06s,background .15s;}
button:active{transform:scale(.98);}
button.primary{background:var(--red);color:#fff;text-align:center;font-weight:600;margin-top:14px;}
button.ghost{background:var(--card2);text-align:center;}
button.danger{background:#fdecea;color:#c0271f;text-align:center;font-weight:600;}
@media (prefers-color-scheme:dark){button.danger{background:#3a1512;color:#ff8a80;}}
.row{display:flex;gap:10px;}
.card{background:var(--card);border-radius:var(--radius);padding:16px;margin:12px 0;box-shadow:0 1px 3px rgba(0,0,0,.05);}
label{display:block;color:var(--sub);font-size:.85rem;margin-bottom:6px;}
input{width:100%;padding:13px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--text);font:inherit;margin-bottom:12px;}
select{width:100%;padding:12px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--text);font:inherit;}
.msg{padding:10px 12px;border-radius:12px;font-size:.9rem;margin:8px 0;}
.msg.err{background:#fdecea;color:#c0271f;}
.msg.ok{background:#e7f6ec;color:#1c7a3c;}
@media (prefers-color-scheme:dark){.msg.err{background:#3a1512;color:#ff8a80;}.msg.ok{background:#12331d;color:#7ee0a1;}}

/* Brand / auth */
.brand{display:flex;align-items:center;gap:12px;margin:20px 0;}
.brand img{width:44px;height:44px;border-radius:10px;}
.authwrap{max-width:400px;margin:6vh auto 0;}
.tabs2{display:flex;background:var(--card2);border-radius:12px;padding:4px;margin-bottom:16px;}
.tabs2 button{background:transparent;text-align:center;padding:10px;border-radius:9px;font-weight:600;color:var(--sub);}
.tabs2 button.active{background:var(--card);color:var(--text);box-shadow:0 1px 2px rgba(0,0,0,.1);}

/* Level card / tiles */
.levelcard{display:flex;align-items:center;gap:16px;}
.lvinfo .xp{font-size:1.3rem;font-weight:700;}
.lvinfo .sub{color:var(--sub);font-size:.85rem;margin:3px 0;}
.ring{width:92px;height:92px;flex:0 0 auto;}
.ring .rbg{fill:none;stroke:var(--line);stroke-width:10;}
.ring .rfg{fill:none;stroke:var(--red);stroke-width:10;stroke-linecap:round;transform:rotate(-90deg);transform-origin:center;transition:stroke-dashoffset .5s;}
.ring .rtext{fill:var(--text);font-size:16px;font-weight:700;}
.tiles{display:flex;gap:10px;margin-top:12px;}
.tile{flex:1;background:var(--card);border-radius:14px;padding:14px 6px;text-align:center;cursor:pointer;}
.tv{font-size:1.2rem;font-weight:700;}
.tl{color:var(--sub);font-size:.7rem;margin-top:2px;}
.pick{margin-top:16px;}

/* Quiz */
.qhead{display:flex;align-items:center;gap:12px;margin-bottom:12px;}
.qhead button{width:auto;background:transparent;padding:6px;color:var(--sub);}
.qhead h2{flex:1;}
.prog{flex:1;height:8px;background:var(--line);border-radius:4px;overflow:hidden;}
.prog>div{height:100%;background:var(--red);transition:width .3s;}
.topic{color:var(--red);font-weight:700;font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;margin-top:6px;}
.qtext{font-size:1.2rem;font-weight:600;margin:8px 0 16px;}
.opts button{margin-bottom:10px;border:1.5px solid var(--line);line-height:1.35;}
.opts button.right{background:rgba(47,168,79,.16);border-color:var(--green);}
.opts button.wrong{background:rgba(224,65,58,.16);border-color:var(--wrong);}

/* Merksatz + expandable */
.merk{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;margin-top:8px;}
.merktitle{font-weight:700;margin-bottom:6px;}
.merktext{color:var(--sub);line-height:1.45;}
.expander{margin-top:12px;}
.expander>.exp-btn{background:var(--card2);border-radius:12px;font-weight:600;display:flex;justify-content:space-between;align-items:center;}
.exp-btn .chev{transition:transform .25s;}
.expander.open .exp-btn .chev{transform:rotate(180deg);}
.exp-body{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.expander.open .exp-body{max-height:3000px;}
.exp-inner{padding:12px 2px 2px;}
.illu-svg{width:100%;height:auto;background:var(--card2);border-radius:12px;margin:6px 0;}
.il-h{fill:var(--text);font-size:13px;font-weight:700;}
.il-t{font-size:12px;font-weight:700;}
.il-s{fill:var(--sub);font-size:10px;}
.il-bignum{font-size:26px;font-weight:800;}
.il-fig{font-size:22px;}
.hot{cursor:pointer;}
.hot:active{opacity:.7;}
.illu-cap{min-height:1.2em;color:var(--text);font-size:.85rem;background:var(--card2);border-radius:10px;padding:8px 10px;margin-top:2px;}
.photo{width:100%;border-radius:12px;margin:6px 0;display:block;cursor:zoom-in;}
.credit{color:var(--sub);font-size:.68rem;opacity:.8;margin-top:-2px;}
.src{color:var(--sub);font-size:.72rem;margin-top:8px;}

/* Lightbox */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.9);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px;}
.lightbox img{max-width:100%;max-height:80%;border-radius:8px;}
.lightbox .lb-cap{position:absolute;bottom:24px;left:0;right:0;text-align:center;color:#fff;font-size:.8rem;padding:0 20px;}

/* Result */
.result{text-align:center;padding-top:16px;}
.result .ring{width:180px;height:180px;margin:0 auto;}
.result .xp{color:var(--red);font-weight:700;font-size:1.2rem;margin:8px 0;}
.newbadges{background:var(--card);border-radius:14px;padding:12px;margin:12px 0;}

/* Learn */
.learncard .exp-btn{background:var(--card);border:1px solid var(--line);}
.fact{display:flex;gap:8px;margin:8px 0;font-size:.92rem;line-height:1.4;}
.fact:before{content:"•";color:var(--red);font-weight:800;}

/* Stats */
.ct{font-weight:700;margin-bottom:10px;}
.bar{margin:10px 0;cursor:pointer;}
.barlabel{font-size:.85rem;margin-bottom:4px;}
.track{height:10px;background:var(--line);border-radius:5px;overflow:hidden;}
.track>div{height:100%;background:var(--red);transition:width .4s;}
.hist{display:flex;align-items:flex-end;gap:6px;height:120px;}
.hbar{flex:1;background:var(--line);border-radius:4px 4px 0 0;display:flex;align-items:flex-end;overflow:hidden;}
.hbar>div{width:100%;background:var(--red);}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(84px,1fr));gap:12px;}
.badge{text-align:center;font-size:.72rem;}
.badge .bsym{font-size:1.7rem;}
.badge.off{opacity:.35;filter:grayscale(1);}
input[type=range]{width:100%;accent-color:var(--red);}
.invrow{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 0;border-bottom:1px solid var(--line);font-size:.85rem;}
.invrow button.revoke{width:auto;background:var(--card2);color:#c0271f;padding:6px 10px;font-size:.78rem;border-radius:8px;}
.foot{color:var(--sub);font-size:.75rem;line-height:1.4;margin-top:16px;}

/* Tab bar */
#tabbar{position:fixed;left:0;right:0;bottom:0;display:flex;background:var(--card);border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom);z-index:20;}
#tabbar button{background:transparent;border-radius:0;text-align:center;color:var(--sub);font-size:.68rem;padding:8px 4px 6px;display:flex;flex-direction:column;align-items:center;gap:2px;}
#tabbar button .ic{font-size:1.25rem;}
#tabbar button.active{color:var(--red);}
[hidden]{display:none !important;}