:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #111418;
  --muted: #5b6470;
  --border: #d7dbe0;
  --accent: #1f5fbf;
  --accent-text: #ffffff;
  --warn-bg: #fff4d6;
  --warn-text: #5c4300;
  --error: #b3261e;
  /* Gruppenfarben, kräftig genug für Beamer */
  --g0: #1f5fbf;
  --g1: #c2410c;
  --g2: #15803d;
  --g3: #9333ea;
  --g4: #be123c;
  --g5: #0e7490;
  --g6: #a16207;
  --g7: #4338ca;
  --group-color: var(--accent);
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.4;
}

[hidden] { display: none !important; }

button {
  font: inherit;
  font-size: 1.1rem;
  padding: 0.6em 1.1em;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.big { font-size: clamp(1.3rem, 2.4vw, 2rem); padding: 0.6em 1.4em; }
button.ghost { background: transparent; }
button.small { font-size: 0.95rem; padding: 0.35em 0.8em; }

.muted { color: var(--muted); }
.error { color: var(--error); font-size: 1.3rem; max-width: 40rem; }
.center { display: grid; place-items: center; min-height: 50vh; text-align: center; padding: 1rem; }

/* ---------- Beamer-Ansicht ---------- */

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem clamp(1rem, 3vw, 2.5rem);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.bar h1 { margin: 0; font-size: clamp(1.3rem, 2.5vw, 2rem); }
.bar-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.demo {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
  padding: 0.6rem clamp(1rem, 3vw, 2.5rem);
  background: var(--warn-bg);
  color: var(--warn-text);
}
.demo a { color: inherit; font-weight: 600; }

.teacher main { padding: clamp(1rem, 3vw, 2.5rem); }

.open-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  min-height: calc(100vh - 10rem);
}

.qr-panel { text-align: center; }
.qr {
  width: min(100%, 62vh);
  margin: 0 auto;
  background: #fff;
  padding: 0.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.qr svg { display: block; width: 100%; height: auto; }
.join-hint { font-size: clamp(1rem, 1.6vw, 1.4rem); color: var(--muted); margin: 1rem 0 0.3rem; }
.join-url { color: var(--text); font-weight: 600; word-break: break-all; }
.join-code { font-size: clamp(1.1rem, 2vw, 1.6rem); margin: 0.3rem 0 0; color: var(--muted); }
.join-code span { color: var(--text); font-weight: 700; letter-spacing: 0.12em; font-family: ui-monospace, Menlo, monospace; }

.count-panel { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 0.6rem; }
.count {
  font-size: clamp(6rem, 18vw, 16rem);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.count-label { font-size: clamp(1.4rem, 3vw, 2.6rem); font-weight: 600; }
.preview { font-size: clamp(1.1rem, 2vw, 1.7rem); color: var(--muted); margin: 0.2rem 0 1rem; }

.settings { margin-top: 1.5rem; color: var(--muted); font-size: 1rem; }
.settings summary { cursor: pointer; }
.settings label { display: block; margin-top: 0.5rem; }
.settings input { width: 4.5em; font: inherit; padding: 0.2em 0.4em; margin-left: 0.4em; }

.done-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.done-summary { margin: 0; font-size: clamp(1.3rem, 2.4vw, 2rem); font-weight: 600; }
.done-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; }

.groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr));
  gap: clamp(0.8rem, 1.5vw, 1.4rem);
}
.group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 10px solid var(--group-color);
  border-radius: 12px;
  padding: 0.8rem 1rem 1rem;
}
.group h2 { margin: 0 0 0.5rem; font-size: clamp(1.4rem, 2.4vw, 2.2rem); color: var(--group-color); }
.group ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.group li {
  font-size: clamp(1.3rem, 2.2vw, 2rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 2.4em;
  text-align: center;
  padding: 0.15em 0.4em;
  border-radius: 8px;
  background: var(--bg);
}

@media (max-width: 800px) {
  .open-grid { grid-template-columns: 1fr; min-height: 0; }
}

/* ---------- Handy-Ansicht ---------- */

.student main {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 16px;
}
.card {
  width: 100%;
  max-width: 28rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 1.15rem;
}
.card h1 { margin-top: 0; font-size: 1.5rem; }
.nr { font-size: 6rem; font-weight: 800; line-height: 1.1; font-variant-numeric: tabular-nums; }
.group-card { border-top: 12px solid var(--group-color); }
.group-big { font-size: 3rem; font-weight: 800; color: var(--group-color); line-height: 1.1; }
.group-big span { display: block; font-size: 6rem; }
.luck { font-size: 1.5rem; font-weight: 600; }

@media print {
  .bar-actions, .demo, .done-actions { display: none !important; }
  body { background: #fff; }
}

/* ---------- Aufgaben-Umfrage ---------- */

.bar h1 { font-size: clamp(1.1rem, 2.2vw, 1.8rem); }
.bar select {
  font: inherit;
  font-size: 1rem;
  padding: 0.5em 0.6em;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--text);
  max-width: 16rem;
}

.legend { margin: -0.8rem 0 1.2rem; font-size: 1rem; }

/* Auf breiten Schirmen zweispaltig, gelesen von oben nach unten, damit alles auf eine Folie passt. */
.results { column-gap: clamp(1rem, 2vw, 2rem); }
@media (min-width: 1000px) {
  .results { columns: 2; }
  .results .result-teile { margin-left: 0; gap: 0.4rem 1.1rem; }
  .results .mini-track { width: clamp(2.5rem, 3.2vw, 5rem); }
}
.result {
  break-inside: avoid;
  margin-bottom: clamp(0.6rem, 1.2vw, 1rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 10px solid var(--border);
  border-radius: 12px;
  padding: 0.7rem 1rem 0.8rem;
}
.result.top { border-left-color: var(--accent); }
.result.none { opacity: 0.55; }
.results { --nr-w: clamp(3.6rem, 6.5vw, 6rem); }
.result-head {
  display: grid;
  grid-template-columns: var(--nr-w) 1fr auto;
  align-items: center;
  gap: 1rem;
}
.result-nr, .result-count {
  font-size: clamp(1.5rem, 2.8vw, 2.4rem);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.result.keine .result-nr { font-size: clamp(1.05rem, 1.9vw, 1.6rem); }
.result.keine .bar-fill { background: var(--muted); }
.result-count { text-align: right; }
.bar-track, .mini-track {
  display: block;
  background: var(--bg);
  border-radius: 999px;
  overflow: hidden;
}
.bar-track { height: clamp(1.1rem, 2vw, 1.6rem); }
.bar-fill, .mini-fill {
  display: block;
  height: 100%;
  background: var(--muted);
  border-radius: 999px;
  transition: width 0.4s ease;
}
.result.top .bar-fill { background: var(--accent); }
.result-teile {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.6rem;
  margin: 0.5rem 0 0 calc(var(--nr-w) + 1rem);
  font-size: clamp(1rem, 1.6vw, 1.35rem);
  font-variant-numeric: tabular-nums;
}
.teil { display: inline-flex; align-items: center; gap: 0.45rem; }
.mini-track { width: clamp(3rem, 7vw, 6rem); height: 0.6rem; }
.mini-fill { background: var(--accent); opacity: 0.7; }

/* Handy-Formular */
.student.vote main { display: block; max-width: 40rem; margin: 0 auto; padding: 16px 16px 6rem; }
.student.vote #view-loading,
.student.vote #view-message,
.student.vote #view-done { margin: 20vh auto 0; }
.vote-head h1 { font-size: 1.35rem; margin: 0.5rem 0 0.3rem; }
.vote-head p { margin: 0 0 1rem; font-size: 0.95rem; }
.aufgaben { display: grid; gap: 0.7rem; }
.aufgabe {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
.aufgabe.selected { border-color: var(--accent); }
.aufgabe-head {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  padding: 0.9rem 1rem;
  cursor: pointer;
  font-size: 1.1rem;
}
.aufgabe-head strong { display: block; }
.aufgabe-text { display: block; color: var(--muted); font-size: 0.95rem; margin-top: 0.1rem; }
.aufgabe input[type=checkbox] { width: 1.4rem; height: 1.4rem; flex: none; margin-top: 0.1rem; accent-color: var(--accent); }
.teile { border-top: 1px solid var(--border); padding: 0.4rem 1rem 0.8rem; display: grid; gap: 0.2rem; }
.teile > * { min-width: 0; }
.teile-hint { margin: 0.3rem 0; font-size: 0.9rem; }
.teil-option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  padding: 0.45rem 0;
  cursor: pointer;
}
.teil-option b { flex: none; }
/* Lange Formeln rutschen in eine eigene Zeile und lassen sich notfalls seitlich wischen. */
.formel { font-size: 1rem; white-space: nowrap; max-width: 100%; overflow-x: auto; overflow-y: hidden; scrollbar-width: none; }
.formel::-webkit-scrollbar { display: none; }
.submit-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.8rem 16px calc(0.8rem + env(safe-area-inset-bottom));
  background: var(--bg);
  border-top: 1px solid var(--border);
  text-align: center;
}
.submit-bar button { width: 100%; max-width: 40rem; }
.submit-error { color: var(--error); font-size: 0.9rem; margin: 0 auto 0.6rem; max-width: 40rem; text-align: left; overflow-wrap: anywhere; }
.done-list { font-size: 1.3rem; font-weight: 700; }

/* Kompaktere Kopfzeile und Zeilen, damit die Auswertung (inkl. „Keine“) auf eine Beamer-Seite passt. */
.teacher .bar { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.teacher .bar h1 { font-size: clamp(1rem, 1.9vw, 1.6rem); white-space: nowrap; }
.teacher .bar button, .teacher .bar select { font-size: 0.95rem; padding: 0.4em 0.8em; }
.teacher .done-head { margin-bottom: 1rem; }
.teacher .done-head button { font-size: 1rem; padding: 0.4em 0.9em; }
.result { padding: 0.5rem 0.9rem 0.6rem; }
.result-teile { margin-top: 0.3rem; }
@media (max-width: 900px) { .teacher .bar h1 { white-space: normal; } }

/* Gemischter Text mit Formeln (Kapitel 2–12) */
.aufgabe-body { min-width: 0; flex: 1; }
.aufgabe-text .absatz { display: block; margin-top: 0.15rem; }
.teile.ohne-teile { display: none !important; }
.teil-inhalt { flex: 1 1 12rem; min-width: 0; }
.teil-inhalt .absatz { display: inline; }
.formel { display: inline-block; vertical-align: middle; }
.formel.block { display: block; margin: 0.35rem 0; color: var(--text); }
.formel-inline { white-space: nowrap; }
.aufgabe-text .formel-inline .katex, .teil-inhalt .formel-inline .katex { font-size: 1.05em; }
.result.viele-teile .mini-track { display: none; }
.result.viele-teile .result-teile { gap: 0.2rem 0.9rem; }
.result.viele-teile .teil { gap: 0.25rem; }
.result.viele-teile .teil.spitze { color: var(--accent); font-weight: 800; }