:root {
  --bg: #f4f7f6;
  --card: #ffffff;
  --text: #1d2a2f;
  --muted: #66777e;
  --border: #dce5e1;
  --primary: #22a06b;
  --primary-dark: #17855a;
  --primary-soft: #dcf4e8;
  --danger: #e04b51;
  --danger-dark: #c23a40;
  --danger-soft: #fde4e4;
  --warn: #f2a516;
  --warn-soft: #fff0cc;
  --shadow: 0 1px 2px rgba(20, 40, 30, .06), 0 4px 14px rgba(20, 40, 30, .05);
  --c0: #3b82f6; --c1: #a855f7; --c2: #f97316; --c3: #14b8a6; --c4: #ec4899; --c5: #84cc16;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111816;
    --card: #1a2421;
    --text: #e6eeea;
    --muted: #92a39c;
    --border: #2a3832;
    --primary-soft: #143a29;
    --danger-soft: #3d1c1f;
    --warn-soft: #3d3114;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.45;
  -webkit-text-size-adjust: 100%;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.3rem; margin-top: 1.6em; }
h3 { font-size: 1.1rem; margin-bottom: .2em; }
p { margin: 0 0 .6em; }
button, input, select, textarea { font: inherit; color: inherit; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.error { color: var(--danger); }
.center { text-align: center; }
.loading-text { padding: 2rem; text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  border: 0; border-bottom: 4px solid rgba(0, 0, 0, .18);
  border-radius: 12px; padding: .7rem 1.2rem; cursor: pointer;
  font-weight: 700; letter-spacing: .02em;
  background: var(--card); color: var(--text);
}
.btn:active:not(:disabled) { transform: translateY(2px); border-bottom-width: 2px; }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn.danger { background: var(--danger); color: #fff; }
.btn.danger:hover:not(:disabled) { background: var(--danger-dark); }
.btn.big { width: 100%; padding: .9rem 1.2rem; font-size: 1.05rem; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.link { background: none; border: 0; color: var(--primary); cursor: pointer; padding: .3rem .4rem; text-decoration: underline; text-underline-offset: 3px; }
.link.small { font-size: .88rem; }
.icon-btn { background: none; border: 0; cursor: pointer; font-size: 1.2rem; padding: .2rem .4rem; border-radius: 8px; }
.icon-btn:hover { background: var(--bg); }

/* ---------- Layout ---------- */
.wrap { max-width: 760px; margin: 0 auto; padding: 0 1rem 3rem; }
.top {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  max-width: 760px; margin: 0 auto; padding: .8rem 1rem;
}
.brand { font-size: 2rem; font-weight: 800; color: var(--primary); margin-bottom: 1rem; }
.brand.small { font-size: 1.25rem; margin: 0; }
.top-right { display: flex; align-items: center; gap: .4rem; flex-wrap: wrap; justify-content: flex-end; }
.who { font-weight: 600; margin-right: .3rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.1rem; box-shadow: var(--shadow); }
.center-screen {
  min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .8rem; padding: 1.5rem 1rem; max-width: 520px; margin: 0 auto; text-align: center;
}
.center-screen .btn.big, .center-screen .card { width: 100%; }
.center-screen .card { text-align: left; }
.spinner {
  width: 42px; height: 42px; border-radius: 50%;
  border: 5px solid var(--border); border-top-color: var(--primary);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.login { display: flex; flex-direction: column; gap: .7rem; width: 100%; }
input[type=text], input[type=password], select, textarea {
  width: 100%; padding: .7rem .8rem; border-radius: 10px;
  border: 2px solid var(--border); background: var(--card);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); }
label.check { display: flex; align-items: center; gap: .5rem; text-align: left; }
label.check input { width: auto; }
.form { display: flex; flex-direction: column; gap: .8rem; width: 100%; text-align: left; }
.form label { font-weight: 600; font-size: .92rem; display: block; margin-bottom: .2rem; }

/* ---------- Startseite ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem; margin: .6rem 0 1rem; width: 100%; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: .7rem .4rem; text-align: center; box-shadow: var(--shadow); }
.stat-icon { font-size: 1.5rem; }
.stat-val { font-size: 1.5rem; font-weight: 800; line-height: 1.1; }
.stat-lab { font-size: .8rem; color: var(--muted); }
.stat.warn .stat-val { color: var(--warn); }
.week { display: flex; justify-content: space-between; gap: .3rem; padding: .7rem 1rem; }
.day { display: flex; flex-direction: column; align-items: center; gap: .25rem; font-size: .78rem; color: var(--muted); }
.dot { width: 30px; height: 30px; border-radius: 50%; border: 2px solid var(--border); display: grid; place-items: center; font-size: .95rem; }
.dot.done { background: var(--primary); border-color: var(--primary); color: #fff; }
.dot.today { border-color: var(--primary); }
.courses { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: .9rem; }
.course { display: flex; flex-direction: column; gap: .4rem; }
.course .btn { margin-top: auto; }
.course-head { display: flex; justify-content: space-between; align-items: flex-start; gap: .5rem; }
.course-head p { margin: 0; }
.course.add { align-items: center; justify-content: center; border-style: dashed; min-height: 150px; text-align: center; }
.lb { width: 100%; border-collapse: collapse; }
.lb th { text-align: left; color: var(--muted); font-size: .8rem; font-weight: 600; padding: .3rem .4rem; }
.lb td { padding: .5rem .4rem; border-top: 1px solid var(--border); }
.lb .num { text-align: right; }
.lb tr.me td { font-weight: 700; background: var(--primary-soft); }
.ach-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .6rem; }
.ach { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: .6rem; text-align: center; }
.ach .ic { font-size: 1.7rem; display: block; }
.ach .tt { font-weight: 700; font-size: .92rem; }
.ach .ds { font-size: .76rem; color: var(--muted); }
.ach.off { opacity: .4; filter: grayscale(1); }

/* ---------- Übung ---------- */
.lesson { min-height: 100vh; display: flex; flex-direction: column; max-width: 720px; margin: 0 auto; }
.topbar { display: flex; align-items: center; gap: .8rem; padding: .9rem 1rem .4rem; }
.x { background: none; border: 0; font-size: 1.5rem; color: var(--muted); cursor: pointer; padding: 0 .3rem; }
.progress { flex: 1; height: 14px; border-radius: 99px; background: var(--border); overflow: hidden; }
.progress-fill { height: 100%; background: var(--primary); border-radius: 99px; transition: width .35s ease; }
.task { flex: 1; padding: .6rem 1rem 1.5rem; display: flex; flex-direction: column; gap: .8rem; }
.prompt { font-size: 1.35rem; margin: .4rem 0 .2rem; }
.badge { align-self: flex-start; background: var(--warn-soft); color: var(--warn); font-weight: 700; font-size: .8rem; padding: .15rem .6rem; border-radius: 99px; margin: 0; }
.opts { display: flex; flex-direction: column; gap: .6rem; }
.opt {
  display: flex; align-items: center; gap: .8rem; text-align: left;
  background: var(--card); border: 2px solid var(--border); border-bottom-width: 4px;
  border-radius: 12px; padding: .8rem 1rem; cursor: pointer;
}
.opt:hover:not(:disabled) { background: var(--primary-soft); }
.opt.sel { border-color: var(--c0); background: color-mix(in srgb, var(--c0) 14%, var(--card)); }
.opt.right { border-color: var(--primary); background: var(--primary-soft); }
.opt.wrong { border-color: var(--danger); background: var(--danger-soft); }
.key { display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem; border: 2px solid var(--border); border-radius: 7px; font-size: .8rem; font-weight: 700; color: var(--muted); flex: none; }
.sentence { font-size: 1.5rem; margin: .6rem 0; }
.gap { display: inline-block; min-width: 5.5rem; border: 0; border-bottom: 3px solid var(--text); background: var(--card); margin: 0 .3rem; padding: 0 .4rem; cursor: pointer; border-radius: 6px 6px 0 0; }
.gap-input { display: inline-block; width: 8.5rem; margin: 0 .3rem; padding: .1rem .4rem; font-size: 1.3rem; }
.hint, .translit { color: var(--muted); font-size: .95rem; }
.translit { font-style: italic; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .4rem; }
.chip {
  background: var(--card); border: 2px solid var(--border); border-bottom-width: 4px;
  border-radius: 12px; padding: .45rem .9rem; font-size: 1.1rem; cursor: pointer;
}
.chip:hover:not(:disabled) { background: var(--primary-soft); }
.chip.used, .chip.ghost { opacity: .35; background: var(--border); color: transparent; border-color: transparent; }
.chip.ghost { cursor: default; }
.answer-line { min-height: 3.6rem; display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; padding: .4rem 0; border-top: 2px solid var(--border); border-bottom: 2px solid var(--border); }
.work.right .answer-line .chip { border-color: var(--primary); background: var(--primary-soft); }
.work.wrong .answer-line .chip { border-color: var(--danger); background: var(--danger-soft); }
.answer-text { font-size: 1.15rem; resize: none; }
.work.right .answer-text { border-color: var(--primary); }
.work.wrong .answer-text { border-color: var(--danger); }
.source { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; font-size: 1.2rem; }
.speak { background: var(--bg); border: 0; border-radius: 99px; width: 2.1rem; height: 2.1rem; cursor: pointer; font-size: 1rem; flex: none; }
.speak:hover { background: var(--primary-soft); }
.pairs { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem .8rem; }
.pair {
  background: var(--card); border: 2px solid var(--border); border-bottom-width: 4px;
  border-radius: 12px; padding: .7rem .6rem; cursor: pointer; text-align: center; font-size: 1.05rem;
}
.pair.sel { border-color: var(--c0); background: color-mix(in srgb, var(--c0) 14%, var(--card)); }
.pair.c0 { border-color: var(--c0); background: color-mix(in srgb, var(--c0) 18%, var(--card)); }
.pair.c1 { border-color: var(--c1); background: color-mix(in srgb, var(--c1) 18%, var(--card)); }
.pair.c2 { border-color: var(--c2); background: color-mix(in srgb, var(--c2) 18%, var(--card)); }
.pair.c3 { border-color: var(--c3); background: color-mix(in srgb, var(--c3) 18%, var(--card)); }
.pair.c4 { border-color: var(--c4); background: color-mix(in srgb, var(--c4) 18%, var(--card)); }
.pair.c5 { border-color: var(--c5); background: color-mix(in srgb, var(--c5) 18%, var(--card)); }
.pair.right { border-color: var(--primary); background: var(--primary-soft); }
.pair.wrong { border-color: var(--danger); background: var(--danger-soft); }
.dialog .dialog-head { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.dline { display: flex; gap: .6rem; padding: .35rem 0; border-top: 1px solid var(--border); }
.dline:first-of-type { border-top: 0; }
.speaker { font-weight: 700; min-width: 3.5rem; color: var(--primary-dark); }
.dtext .de { display: none; color: var(--muted); font-size: .92rem; }
.dialog.show-de .dtext .de { display: block; }
.kbd { margin-top: .8rem; display: flex; flex-direction: column; gap: .35rem; }
.kbd-row { display: flex; justify-content: center; gap: .25rem; flex-wrap: nowrap; }
.key-btn {
  flex: 1 1 0; min-width: 0; max-width: 2.6rem; padding: .5rem 0; font-size: 1.05rem;
  background: var(--card); border: 1px solid var(--border); border-bottom-width: 3px; border-radius: 8px; cursor: pointer;
}
.key-btn.wide { max-width: none; flex: 2 1 0; }
.typing-extras { text-align: center; }

.footer {
  position: sticky; bottom: 0; padding: .9rem 1rem calc(.9rem + env(safe-area-inset-bottom));
  background: var(--bg); border-top: 2px solid var(--border);
}
.footer.ok { background: var(--primary-soft); border-top-color: var(--primary); }
.footer.bad { background: var(--danger-soft); border-top-color: var(--danger); }
.footer.warn { background: var(--warn-soft); border-top-color: var(--warn); }
.fb { margin-bottom: .8rem; }
.fb-title { font-size: 1.25rem; font-weight: 800; margin-bottom: .2rem; }
.footer.ok .fb-title { color: var(--primary-dark); }
.footer.bad .fb-title { color: var(--danger); }
.footer.warn .fb-title { color: #a86f00; }
.fb-line { margin: .2rem 0; display: flex; align-items: center; gap: .4rem; flex-wrap: wrap; }
.fb-note { font-size: .78rem; color: var(--muted); margin-top: .3rem; }

.intro .tip strong { display: block; margin-bottom: .3rem; }
.big-emoji { font-size: 4rem; }
.result .stats { max-width: 420px; }
.ach-new { display: flex; gap: .7rem; align-items: center; padding: .3rem 0; }
.ach-new .ic { font-size: 2rem; }

.toast {
  position: fixed; left: 50%; bottom: 6rem; transform: translateX(-50%);
  background: #222; color: #fff; padding: .6rem 1rem; border-radius: 10px; z-index: 50; max-width: 90vw; text-align: center;
}

@media (max-width: 420px) {
  body { font-size: 16px; }
  .sentence { font-size: 1.3rem; }
  .prompt { font-size: 1.2rem; }
}