:root {
  --bg: #f7f9f4;
  --card: #ffffff;
  --ink: #1f2a1f;
  --muted: #6b766b;
  --line: #e3e8df;
  --green: #2fb344;
  --green-dark: #23893a;
  --green-soft: #dff5e1;
  --red: #e5484d;
  --red-dark: #b8363a;
  --red-soft: #fde4e4;
  --blue: #1c9bef;
  --blue-dark: #1478b9;
  --blue-soft: #ddf0fd;
  --gold: #f5b300;
  --orange: #ff8a00;
  --purple: #8b5cf6;
  --shadow: 0 2px 0 rgba(0,0,0,.06);
  --radius: 18px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121712;
    --card: #1b221b;
    --ink: #eef3ec;
    --muted: #9aa69a;
    --line: #2c372c;
    --green-soft: #183a1f;
    --red-soft: #3d1c1d;
    --blue-soft: #14304a;
    --shadow: 0 2px 0 rgba(0,0,0,.4);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Nunito", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.4;
  -webkit-tap-highlight-color: transparent;
}
button { font: inherit; color: inherit; touch-action: manipulation; }
.app { max-width: 720px; margin: 0 auto; min-height: 100dvh; padding: 0 16px calc(96px + env(safe-area-inset-bottom)); }

/* ---- Buttons ---------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 0; border-radius: 16px; padding: 14px 22px;
  font-weight: 900; font-size: 16px; letter-spacing: .04em; text-transform: uppercase;
  background: var(--green); color: #fff; cursor: pointer;
  box-shadow: 0 4px 0 var(--green-dark);
  transition: transform .06s, box-shadow .06s, filter .1s;
  user-select: none;
}
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--green-dark); }
.btn:disabled { background: var(--line); color: var(--muted); box-shadow: 0 4px 0 var(--line); cursor: default; filter: none; }
.btn.block { width: 100%; }
.btn.blue { background: var(--blue); box-shadow: 0 4px 0 var(--blue-dark); }
.btn.red { background: var(--red); box-shadow: 0 4px 0 var(--red-dark); }
.btn.ghost { background: var(--card); color: var(--ink); box-shadow: 0 4px 0 var(--line); border: 2px solid var(--line); }
.btn.small { padding: 9px 14px; font-size: 13px; border-radius: 12px; }
.iconbtn { background: none; border: 0; font-size: 26px; cursor: pointer; padding: 6px; color: var(--muted); line-height: 1; }

/* ---- Kopf ------------------------------------------------------------- */
.top {
  position: sticky; top: 0; z-index: 5; background: var(--bg);
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 14px 0 10px; border-bottom: 2px solid var(--line); margin-bottom: 16px;
}
.brand { font-weight: 900; font-size: 22px; color: var(--green); letter-spacing: -.02em; }
.chips { display: flex; gap: 14px; align-items: center; font-weight: 900; }
.chip { display: inline-flex; align-items: center; gap: 4px; }
.chip.streak { color: var(--orange); }
.chip.streak.off { color: var(--muted); filter: grayscale(1); }
.chip.xp { color: var(--gold); }
.chip.level { color: var(--purple); }
.avatar { font-size: 28px; cursor: pointer; background: none; border: 0; padding: 0; }

/* ---- Karten ----------------------------------------------------------- */
.card { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.stack > * + * { margin-top: 14px; }
h1 { font-size: 26px; font-weight: 900; margin: 8px 0 4px; letter-spacing: -.01em; }
h2 { font-size: 20px; font-weight: 900; margin: 26px 0 10px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.center { text-align: center; }

.goal { display: flex; gap: 14px; align-items: center; }
.goal .emoji { font-size: 40px; }
.goal .info { flex: 1; }
.bar { height: 14px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--gold); border-radius: 99px; transition: width .4s; }
.bar.green > span { background: var(--green); }

.subject { display: flex; align-items: center; gap: 10px; }
.subject .tag { background: var(--blue-soft); color: var(--blue-dark); border-radius: 10px; padding: 3px 10px; font-weight: 900; font-size: 14px; }

.quiz { display: grid; gap: 12px; }
.quiz .head { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; }
.quiz .title { font-weight: 900; font-size: 19px; }
.stars { font-size: 20px; letter-spacing: 2px; white-space: nowrap; }
.stars .off { opacity: .2; filter: grayscale(1); }
.quiz .meta { display: flex; gap: 12px; flex-wrap: wrap; font-size: 14px; font-weight: 700; color: var(--muted); }
.quiz .meta .bad { color: var(--red); }
.quiz .meta .good { color: var(--green-dark); }
.quiz .actions { display: flex; gap: 10px; flex-wrap: wrap; }
.quiz .actions .btn:first-child { flex: 1; }

/* ---- Navigation unten ------------------------------------------------- */
.nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  background: var(--card); border-top: 2px solid var(--line);
  display: flex; justify-content: center; gap: 8px; padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
}
.nav button { flex: 0 1 140px; background: none; border: 2px solid transparent; border-radius: 14px; padding: 6px; font-weight: 800; font-size: 13px; color: var(--muted); cursor: pointer; }
.nav button span { display: block; font-size: 24px; }
.nav button.on { color: var(--blue); border-color: var(--blue-soft); background: var(--blue-soft); }

/* ---- Profile ---------------------------------------------------------- */
.profiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 14px; }
.profile { text-align: center; cursor: pointer; border: 2px solid var(--line); background: var(--card); border-radius: var(--radius); padding: 20px 10px; box-shadow: 0 4px 0 var(--line); font-weight: 900; }
.profile:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--line); }
.profile .big { font-size: 54px; display: block; }
.avatars { display: flex; flex-wrap: wrap; gap: 8px; }
.avatars button { font-size: 32px; border: 2px solid var(--line); background: var(--card); border-radius: 14px; padding: 6px 10px; cursor: pointer; }
.avatars button.on { border-color: var(--blue); background: var(--blue-soft); }
input[type=text], input[type=password] {
  width: 100%; font: inherit; font-weight: 700; padding: 14px 16px; border-radius: 14px;
  border: 2px solid var(--line); background: var(--card); color: var(--ink); outline: none;
}
input:focus { border-color: var(--blue); }

/* ---- Spiel ------------------------------------------------------------ */
.play { display: flex; flex-direction: column; min-height: 100dvh; padding-top: 14px; }
.playtop { display: flex; align-items: center; gap: 12px; }
.playtop .bar { flex: 1; height: 18px; }
.playtop .bar > span { background: var(--green); position: relative; }
.playtop .bar > span::after { content: ""; position: absolute; left: 8px; right: 8px; top: 4px; height: 4px; border-radius: 4px; background: rgba(255,255,255,.35); }
.combo { font-weight: 900; color: var(--orange); min-width: 54px; text-align: right; white-space: nowrap; }
.combo.pop { animation: pop .35s; }
.qbox { flex: 1; padding: 26px 0 220px; }
.qlabel { font-weight: 900; color: var(--purple); font-size: 14px; text-transform: uppercase; letter-spacing: .06em; display: flex; gap: 8px; align-items: center; }
.qlabel .again { color: var(--orange); }
.qtext { font-size: 24px; font-weight: 900; margin: 10px 0 22px; line-height: 1.25; }
.answers { display: grid; gap: 12px; }
.answer {
  display: flex; align-items: center; gap: 14px; text-align: left; width: 100%;
  background: var(--card); border: 2px solid var(--line); border-radius: 16px; padding: 14px 16px;
  font-weight: 800; font-size: 18px; cursor: pointer; box-shadow: 0 4px 0 var(--line);
  transition: transform .06s, box-shadow .06s, background .1s, border-color .1s;
}
.answer:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--line); }
.answer .key { flex: none; width: 30px; height: 30px; border-radius: 9px; border: 2px solid var(--line); display: grid; place-items: center; font-size: 14px; color: var(--muted); }
.answer.sel { border-color: var(--blue); background: var(--blue-soft); box-shadow: 0 4px 0 var(--blue); }
.answer.sel .key { border-color: var(--blue); color: var(--blue); }
.answer.right { border-color: var(--green); background: var(--green-soft); box-shadow: 0 4px 0 var(--green); }
.answer.right .key { border-color: var(--green); color: var(--green); }
.answer.wrong { border-color: var(--red); background: var(--red-soft); box-shadow: 0 4px 0 var(--red); animation: shake .35s; }
.answer.wrong .key { border-color: var(--red); color: var(--red); }
.answer.dim { opacity: .5; }
.answers.locked .answer { cursor: default; }

.sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  background: var(--bg); border-top: 2px solid var(--line);
  padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
}
.sheet .inner { max-width: 688px; margin: 0 auto; }
.sheet.ok { background: var(--green-soft); border-color: transparent; }
.sheet.bad { background: var(--red-soft); border-color: transparent; }
.sheet.show { animation: up .22s ease-out; }
.verdict { display: flex; align-items: center; gap: 10px; font-weight: 900; font-size: 22px; margin-bottom: 6px; }
.sheet.ok .verdict { color: var(--green-dark); }
.sheet.bad .verdict { color: var(--red-dark); }
.sheet .solution { font-weight: 800; margin-bottom: 4px; }
.sheet .expl { font-size: 15px; margin-bottom: 14px; }
.sheet.ok .expl { color: var(--green-dark); }
.sheet.bad .expl { color: var(--red-dark); }
.sheet .xpgain { float: right; font-weight: 900; color: var(--gold); }

/* ---- Ergebnis --------------------------------------------------------- */
.result { text-align: center; padding-top: 30px; }
.result .bigstars { font-size: 60px; letter-spacing: 6px; margin: 10px 0; }
.result .bigstars span { display: inline-block; animation: starIn .5s both; }
.result .bigstars span:nth-child(2) { animation-delay: .25s; }
.result .bigstars span:nth-child(3) { animation-delay: .5s; }
.tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 22px 0; }
.tile { border: 2px solid; border-radius: 16px; overflow: hidden; font-weight: 900; }
.tile .lbl { color: #fff; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; padding: 4px; }
.tile .val { padding: 12px 4px; font-size: 22px; background: var(--card); }
.tile.gold { border-color: var(--gold); } .tile.gold .lbl { background: var(--gold); } .tile.gold .val { color: var(--gold); }
.tile.green { border-color: var(--green); } .tile.green .lbl { background: var(--green); } .tile.green .val { color: var(--green); }
.tile.blue { border-color: var(--blue); } .tile.blue .lbl { background: var(--blue); } .tile.blue .val { color: var(--blue); }
.mistake { text-align: left; border-left: 5px solid var(--red); }
.mistake .q { font-weight: 900; margin-bottom: 6px; }
.mistake .was { color: var(--red); font-weight: 800; text-decoration: line-through; }
.mistake .is { color: var(--green-dark); font-weight: 800; }
.badge { display: inline-block; background: var(--gold); color: #fff; font-weight: 900; padding: 6px 14px; border-radius: 99px; letter-spacing: .06em; text-transform: uppercase; font-size: 14px; }

/* ---- Verlauf ---------------------------------------------------------- */
.hist { display: flex; align-items: center; gap: 14px; cursor: pointer; }
.hist .pct { flex: none; width: 58px; height: 58px; border-radius: 50%; display: grid; place-items: center; font-weight: 900; font-size: 16px; color: #fff; }
.hist .info { flex: 1; min-width: 0; }
.hist .info b { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row { display: flex; gap: 10px; align-items: flex-start; padding: 10px 0; border-bottom: 1px solid var(--line); }
.row:last-child { border-bottom: 0; }
.row .ico { font-size: 20px; flex: none; }
.daylabel { font-weight: 900; color: var(--muted); font-size: 14px; text-transform: uppercase; letter-spacing: .06em; margin: 22px 0 8px; }

.empty { text-align: center; padding: 40px 10px; color: var(--muted); font-weight: 700; }
.empty .big { font-size: 64px; display: block; }
.error { background: var(--red-soft); color: var(--red-dark); font-weight: 800; border-radius: 14px; padding: 12px 14px; }

@media (max-width: 420px) {
  .qtext { font-size: 21px; margin-bottom: 18px; }
  .answer { font-size: 17px; padding: 12px 14px; }
  .chips { gap: 10px; }
}
@media (min-width: 768px) {
  .qtext { font-size: 28px; }
  .answer { padding: 18px 20px; font-size: 20px; }
}

/* ---- Konfetti & Animationen ------------------------------------------- */
#confetti { position: fixed; inset: 0; pointer-events: none; z-index: 50; overflow: hidden; }
#confetti i { position: absolute; top: -20px; width: 10px; height: 16px; border-radius: 3px; animation: fall linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(720deg); } }
@keyframes shake { 0%,100% { transform: translateX(0); } 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
@keyframes up { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes pop { 50% { transform: scale(1.4); } }
@keyframes starIn { from { transform: scale(0) rotate(-90deg); opacity: 0; } to { transform: scale(1) rotate(0); opacity: 1; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }