:root {
  --bg: #f4f6fa;
  --bg-elevated: #ffffff;
  --text: #1c2536;
  --text-muted: #5b6478;
  --border: #dde2ec;
  --accent: #1d63c9;
  --accent-hover: #164e9f;
  --accent-soft: #e7f0fd;
  --success: #1c8a4b;
  --success-soft: #e4f6ea;
  --danger: #c9341d;
  --danger-soft: #fbe8e4;
  --shadow: 0 2px 10px rgba(20, 30, 60, 0.06);
  --radius: 14px;
}

[data-theme="dark"] {
  --bg: #10131c;
  --bg-elevated: #1a1f2e;
  --text: #eef1f8;
  --text-muted: #9aa3b8;
  --border: #2b3247;
  --accent: #5b9bf5;
  --accent-hover: #7fb0f7;
  --accent-soft: #1e2c47;
  --success: #4cbb7c;
  --success-soft: #163524;
  --danger: #e2604a;
  --danger-soft: #3a2020;
  --shadow: 0 2px 14px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #10131c;
    --bg-elevated: #1a1f2e;
    --text: #eef1f8;
    --text-muted: #9aa3b8;
    --border: #2b3247;
    --accent: #5b9bf5;
    --accent-hover: #7fb0f7;
    --accent-soft: #1e2c47;
    --success: #4cbb7c;
    --success-soft: #163524;
    --danger: #e2604a;
    --danger-soft: #3a2020;
    --shadow: 0 2px 14px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.app-header h1 {
  font-size: 1.15rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.icon-btn {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  width: 2.3rem;
  height: 2.3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.05rem;
}
.icon-btn:hover { filter: brightness(1.05); }

nav.tabs {
  display: flex;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  overflow-x: auto;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

nav.tabs button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.92rem;
  white-space: nowrap;
}

nav.tabs button.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  border-color: var(--accent-soft);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.hero h2 { margin-top: 0; }
.hero p { color: var(--text-muted); }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}
.stat-box {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 0.8rem 1rem;
  text-align: center;
}
.stat-box .num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}
.stat-box .label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.6rem 1.1rem;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
}
.btn:hover { background: var(--accent-hover); }
.btn.secondary {
  background: var(--accent-soft);
  color: var(--accent);
}
.btn.ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

select, .select {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem 0.7rem;
  font-size: 0.92rem;
}

.row-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.quiz-progress-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem 1rem;
}

table.progress-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
table.progress-table th, table.progress-table td {
  text-align: left;
  padding: 0.55rem 0.5rem;
  border-bottom: 1px solid var(--border);
}
table.progress-table th { color: var(--text-muted); font-weight: 600; font-size: 0.82rem; }

/* Filterleiste (Rest-Nutzung) */
.filter-group { display: flex; flex-direction: column; gap: 0.4rem; }
.filter-label { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; color: var(--text-muted); }
.chip-row { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.chip-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.82rem;
  cursor: pointer;
}
.chip-btn:hover { border-color: var(--accent); }
.chip-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

/* Prüfungs-/Varianten-Auswahl */
.back-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
  margin-bottom: 0.8rem;
  font-size: 0.92rem;
}
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.9rem;
}
.topic-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease;
}
.topic-card:hover { transform: translateY(-2px); }
.topic-card .icon { font-size: 1.6rem; }
.topic-card h3 { margin: 0.4rem 0 0.2rem; font-size: 1.02rem; }
.topic-card .meta { font-size: 0.8rem; color: var(--text-muted); }

/* Seiten-Navigation (Bereiche der Prüfung) – links als Liste, mobil als horizontale Leiste */
.pages-layout {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
}
.pages-main { flex: 1; min-width: 0; }

.section-sidebar {
  flex: 0 0 230px;
  position: sticky;
  top: 3.6rem;
  padding: 0.7rem;
  max-height: calc(100vh - 4.4rem);
  overflow-y: auto;
}
.section-sidebar .page-tab-row { flex-direction: column; gap: 0.3rem; }
.page-tab {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  font-size: 0.87rem;
  cursor: pointer;
  text-align: left;
  width: 100%;
}
.page-tab:hover { border-color: var(--accent); }
.page-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.page-tab-count {
  font-size: 0.72rem;
  background: rgba(0,0,0,0.12);
  border-radius: 999px;
  padding: 0.05rem 0.4rem;
  flex-shrink: 0;
}
.page-tab.active .page-tab-count { background: rgba(255,255,255,0.25); }

@media (max-width: 780px) {
  .pages-layout { flex-direction: column; }
  .section-sidebar {
    position: sticky;
    top: 3.6rem;
    z-index: 6;
    width: 100%;
    max-height: none;
    overflow-y: visible;
  }
  .section-sidebar .page-tab-row { flex-direction: row; flex-wrap: nowrap; overflow-x: auto; padding-bottom: 0.15rem; }
  .page-tab { width: auto; white-space: nowrap; flex-shrink: 0; }
}

/* Sticky Video (Hörverständnis-Seite) */
#videoSticky { display: contents; }
.video-sticky-wrap {
  position: sticky;
  top: 3.6rem;
  z-index: 4;
  background: var(--bg);
  padding-bottom: 0.5rem;
  margin-bottom: 0.9rem;
  box-shadow: 0 8px 12px -8px rgba(0,0,0,0.25);
}
@media (max-width: 780px) {
  .video-sticky-wrap { top: 6.9rem; }
}

/* Selbstbewertung / Auto-Korrektur pro Aufgabe */
.selfscore-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.selfscore-input {
  width: 3.6rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.3rem 0.4rem;
  font-size: 0.88rem;
  text-align: center;
}
.selfscore-row.auto { gap: 0.6rem; font-weight: 600; color: var(--text); }
.selfscore-row.auto.pending { font-weight: 400; font-style: italic; color: var(--text-muted); }
.badge-auto {
  background: var(--success-soft);
  color: var(--success);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.74rem;
  font-weight: 700;
}

/* Grafikaufgabe */
.grafik-gruppe { margin-bottom: 1.4rem; }
.grafik-titel { font-weight: 700; font-size: 0.9rem; margin-bottom: 0.5rem; }
.grafik-bild {
  width: 100%;
  max-width: 480px;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 0.7rem;
}

/* Ein-Aufgabe-pro-Seite Navigation */
.page-position { font-size: 0.8rem; color: var(--text-muted); margin: 0.3rem 0 0.8rem; }
.page-nav-buttons {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 1.2rem;
}
.page-nav-buttons .btn { flex: 1 1 0; text-align: center; }
.page-nav-buttons .btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Wahlzettel-Vorlage */
.vorlage-box { margin: 0.9rem 0; }
.wahlzettel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.wahlzettel {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
}
.wahlzettel-kopf {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.78rem;
  padding: 0.4rem 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.wahlzettel-liste { font-style: italic; font-size: 0.85rem; padding: 0.5rem 0.7rem 0.3rem; }
.wahlzettel-kandidat { padding: 0.4rem 0.7rem; border-top: 1px dashed var(--border); font-size: 0.88rem; }
@media (max-width: 520px) {
  .wahlzettel-grid { grid-template-columns: 1fr; }
}

/* Aufgaben-Karten */
.meta-bar { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.6rem; }
.badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-weight: 600;
}
.badge-thema { background: var(--accent-soft); color: var(--accent); }
.badge-typ { background: var(--bg); border: 1px solid var(--border); color: var(--text-muted); }
.badge-herkunft { background: var(--bg); border: 1px solid var(--border); color: var(--text-muted); font-weight: 500; }
.badge-wahlteil { background: var(--success-soft); color: var(--success); }

.section-intro h3 { margin-top: 0; }
.video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin: 0.9rem 0 0.4rem;
  border-radius: 10px;
  overflow: hidden;
  background: #000;
}
.video-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.video-caption { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.9rem; }

.ablauf-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
}
.ablauf-title { font-weight: 700; font-size: 0.85rem; margin-bottom: 0.5rem; }
.ablauf-steps { display: flex; flex-direction: column; gap: 0.4rem; }
.ablauf-step {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.88rem;
  padding: 0.3rem 0;
  border-bottom: 1px dashed var(--border);
}
.ablauf-step:last-child { border-bottom: none; }
.ablauf-dauer {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  font-size: 0.76rem;
  font-weight: 700;
  flex-shrink: 0;
  min-width: 3.2rem;
  text-align: center;
}

.hinweis-box {
  background: var(--accent-soft);
  color: var(--text);
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
}

.aufgabe-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
}
.aufgabe-card.reference { background: var(--accent-soft); border-style: dashed; box-shadow: none; }

.aufgabe-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}
.aufgabe-nr {
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  min-width: 1.6rem;
  height: 1.6rem;
  padding: 0 0.35rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.74rem;
  font-weight: 700;
  flex-shrink: 0;
}
.aufgabe-titel { font-weight: 700; }
.aufgabe-punkte { margin-left: auto; font-size: 0.78rem; color: var(--text-muted); }
.aufgabe-frage { margin-bottom: 0.7rem; white-space: pre-line; }
.aufgabe-frage p:first-child { margin-top: 0; }
.aufgabe-aussage { margin: 0 0 0.9rem; padding: 0.6rem 0.9rem; background: var(--accent-soft); border-left: 3px solid var(--accent); border-radius: 8px; }

.field-label { display: block; font-size: 0.82rem; color: var(--text-muted); margin: 0.5rem 0 0.25rem; }
.answer-input {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font-family: inherit;
  font-size: 0.92rem;
  resize: vertical;
}

.loesung-block {
  display: none;
  margin-top: 0.9rem;
  padding: 0.8rem 1rem;
  background: var(--success-soft);
  border-radius: 10px;
  font-size: 0.9rem;
  line-height: 1.55;
}
.aufgabe-card.revealed .loesung-block { display: block; }

.mc-block { margin-bottom: 0.9rem; }
.mc-block-label { font-weight: 600; margin-bottom: 0.35rem; font-size: 0.92rem; }
.opt-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.55rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}
.opt-row:hover { background: var(--accent-soft); }
.opt-row.inline { padding: 0.25rem 0.5rem; }
.aufgabe-card.revealed .opt-row[data-correct="true"] { background: var(--success-soft); font-weight: 600; }
.aufgabe-card.revealed .opt-row:has(input:checked)[data-correct="false"] { background: var(--danger-soft); }

.tf-table { display: flex; flex-direction: column; gap: 0.6rem; }
.tf-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.5rem;
}
.tf-text { flex: 1 1 260px; font-size: 0.9rem; }
.tf-options { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.matchn-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}
.matchn-text { font-size: 0.9rem; }
.aufgabe-card.revealed select[data-correct] { outline: 2px solid var(--success); border-radius: 8px; }

.fillblank-text { line-height: 2.6; font-size: 0.95rem; }
.blank-drop {
  display: inline-flex;
  min-width: 7rem;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  border: 2px dashed var(--accent);
  border-radius: 8px;
  padding: 0.1rem 0.6rem;
  font-size: 0.88rem;
  margin: 0 0.2rem;
  cursor: pointer;
  vertical-align: middle;
}
.blank-drop.filled { border-style: solid; background: var(--bg-elevated); color: var(--text); font-weight: 600; }
.blank-drop:hover { border-color: var(--accent-hover); }

.wordbank { margin-top: 0.9rem; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.chip {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.78rem;
}
.drag-chip { cursor: grab; user-select: none; border: 1px solid transparent; }
.drag-chip:active { cursor: grabbing; }
.drag-chip:hover { border-color: var(--accent); }

.vorgaben-list { color: var(--text-muted); font-size: 0.85rem; margin: 0 0 0.6rem 1.1rem; }
.word-count { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.4rem; }

.quelltext-details { margin-bottom: 1rem; }
.quelltext-details summary { cursor: pointer; font-weight: 600; color: var(--accent); padding: 0.4rem 0; }
.quelltext { max-height: 380px; overflow-y: auto; padding: 0.9rem 1rem; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; font-size: 0.88rem; line-height: 1.6; }
.quelltext h4 { margin: 0.9rem 0 0.3rem; font-size: 0.95rem; }
.quelltext .quelle { color: var(--text-muted); font-size: 0.78rem; margin-top: 0; }

/* Themenfilter: Kontext-Label über Aufgaben aus gemischten Prüfungsjahrgängen */
.exam-context-tag { font-size: 0.78rem; font-weight: 600; color: var(--text-muted); margin: 1.2rem 0 0.4rem; }
.exam-context-tag:first-child { margin-top: 0; }

/* Karteikarten */
.flashcard { perspective: 1400px; cursor: pointer; height: 280px; margin: 1rem 0; }
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  text-align: center;
  gap: 0.8rem;
}
.flashcard-back { transform: rotateY(180deg); }
.flashcard-text { font-size: 1.3rem; font-weight: 700; }
.flashcard-back .flashcard-text { font-size: 1.05rem; font-weight: 400; line-height: 1.55; }
.flashcard-hint { font-size: 0.78rem; color: var(--text-muted); }

@media (max-width: 480px) {
  .app-header h1 { font-size: 1rem; }
  main { padding: 1rem 0.85rem 3.5rem; }
  .filter-bar { position: static; }
}