:root {
  --bg: #f4f6fb; --card: #ffffff; --text: #1b2333; --muted: #667085;
  --primary: #2563eb; --primary-d: #1d4ed8; --ok: #16a34a; --bad: #dc2626;
  --line: #e2e7f0; --bubble-a: #e8edf8; --bubble-b: #dbeafe;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420; --card: #1a2133; --text: #eef2fb; --muted: #9aa6bf;
    --primary: #3b82f6; --primary-d: #2563eb; --ok: #4ade80; --bad: #f87171;
    --line: #2a3350; --bubble-a: #243049; --bubble-b: #1e3a6b;
  }
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
#app { max-width: 640px; margin: 0 auto; min-height: 100vh;
  padding: calc(env(safe-area-inset-top) + 14px) 14px calc(env(safe-area-inset-bottom) + 24px); }
h1 { font-size: 1.7rem; margin: .2rem 0 .1rem; }
h2 { font-size: 1.25rem; margin: 1.2rem 0 .5rem; }
p { margin: .3rem 0 .8rem; }
.muted { color: var(--muted); font-size: .92rem; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 14px; margin: 10px 0; }
button { font: inherit; color: inherit; cursor: pointer; border: 1px solid var(--line);
  background: var(--card); border-radius: 14px; padding: 12px 14px; min-height: 48px; }
button:active { transform: scale(.98); }
button:disabled { opacity: .5; cursor: default; }
button.primary { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
button.primary:active { background: var(--primary-d); }
button.ghost { background: transparent; }
button.block { display: block; width: 100%; text-align: left; margin: 8px 0; }
button.big { font-size: 1.1rem; min-height: 56px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }
.row > * { flex: 1; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.chip { flex: 0 0 auto; padding: 8px 14px; border-radius: 99px; min-height: 40px; }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.levels { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.lvl { text-align: left; padding: 12px; }
.lvl b { font-size: 1.25rem; display: block; }
.lvl span { font-size: .85rem; color: var(--muted); }
.lvl.sel { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary) inset; }
.chat { display: flex; flex-direction: column; gap: 8px; padding-bottom: 8px; }
.bubble { max-width: 88%; padding: 10px 13px; border-radius: 16px; background: var(--bubble-a); }
.bubble.b { align-self: flex-end; background: var(--bubble-b); }
.bubble .de { display: none; font-size: .88rem; color: var(--muted); margin-top: 4px; }
.bubble.showde .de { display: block; }
.bubble .who { font-size: .75rem; color: var(--muted); }
.w-ok { color: var(--ok); font-weight: 600; }
.w-bad { color: var(--bad); font-weight: 600; text-decoration: underline; }
.panel { position: sticky; bottom: 0; background: var(--bg); padding: 10px 0 4px; border-top: 1px solid var(--line); }
.fb { min-height: 1.6em; margin: 8px 2px; font-weight: 500; }
.opt.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 18%, var(--card)); }
.opt.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 18%, var(--card)); }
.progress { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin: 6px 0 12px; }
.progress > i { display: block; height: 100%; background: var(--primary); }
.done::after { content: " ✓"; color: var(--ok); font-weight: 700; }
.result { text-align: center; padding: 18px 8px; }
.result .big-lvl { font-size: 3.2rem; font-weight: 800; color: var(--primary); line-height: 1.1; }
label { display: block; font-size: .9rem; color: var(--muted); margin: 10px 0 4px; }
label.check { display: flex; align-items: center; gap: 8px; color: var(--text); margin: 14px 0; }
input[type=text], input[type=password] { width: 100%; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 12px; min-height: 48px; }
input[type=checkbox] { width: 20px; height: 20px; }
a.logout { color: var(--muted); font-size: .9rem; }
.voice { display: flex; gap: 8px; align-items: center; }
.voice .vname { flex: 1; margin: 4px 0; }
.voice.sel .vname { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary) inset; }
.vplay { flex: 0 0 56px; min-height: 56px; }

/* Übungen */
.stars { color: #f5a623; letter-spacing: 1px; margin-left: 6px; }
.tiles, .answer { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.answer { min-height: 56px; padding: 8px; border: 2px dashed var(--line); border-radius: 12px; align-items: center; }
.tile { padding: 10px 14px; border-radius: 10px; font-size: 1.05rem; min-height: 44px; }
.flash { text-align: center; padding: 28px 16px; cursor: pointer; }
.flash .w { font-size: 2rem; font-weight: 600; }
.lvl:disabled { opacity: .45; }
button:disabled { opacity: .5; }

/* Konto */
input[type=email], select { width: 100%; font: inherit; color: var(--text); background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px; box-sizing: border-box; }
.btnlink { display: block; padding: 12px; margin: 8px 0; border: 1px solid var(--line); border-radius: 10px; text-align: center; text-decoration: none; color: inherit; }
details.card summary { cursor: pointer; }
.card button { margin-top: 8px; }

/* Endlos-Training */
.tr-status { text-align: center; margin: 4px 0 8px; }
.tr-big { font-size: 1.8rem; font-weight: 600; text-align: center; padding: 6px 0; }
.tr-sent { font-size: 1.25rem; line-height: 1.4; }
.tr-in { width: 100%; font-size: 1.2rem; padding: 12px; margin: 10px 0; border-radius: 12px; border: 2px solid var(--line, #cbd5e1); box-sizing: border-box; }
.tr-line { min-height: 3.2em; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.tr-tok { background: var(--primary); color: #fff; padding: 6px 10px; border-radius: 10px; }
.tr-pool { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.tr-chip { padding: 10px 14px; border-radius: 12px; font-size: 1.05rem; min-height: 44px; }
.tr-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.tr-cols .opt.sel { border-color: var(--primary); }