/* =========================================================
   üben — SuS-Frontend
   Design-System: bungsapp-design-system v1
   iPad-first, min-width 768px, Touch-Targets >= 44px,
   Mindest-Textgröße 20px, Content-Max 720px.
   ========================================================= */

/* Nunito (Variable Font, latin-Subset) selbstgehostet aus static/fonts/.
   CSP für /ueben (default-src 'self') erlaubt keinen Font-CDN. Eine Datei
   deckt die Gewichts-Achse 400..800 ab, font-display: swap zeigt während
   des Ladens den System-Fallback (ui-rounded). */
@font-face {
  font-family: 'Nunito';
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url('/static/fonts/Nunito-Variable-Latin.woff2') format('woff2-variations'),
       url('/static/fonts/Nunito-Variable-Latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
                 U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F,
                 U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF,
                 U+FFFD;
}

:root {
  --color-primary:           #2F6FEB;
  --color-primary-hover:     #2660D4;
  --color-primary-press:     #1F52BC;
  --color-primary-tint:      rgba(47, 111, 235, 0.12);

  --color-mastery:           #E8B53A;
  --color-mastery-tint:      rgba(232, 181, 58, 0.18);

  --color-success:           #3FA86B;
  --color-success-bg:        #E9F5EE;
  --color-success-text:      #1F6F3F;

  --color-caution:           #E89A3F;
  --color-caution-bg:        #FBEEDC;
  --color-caution-text:      #7B4E12;

  --color-error:             #D9534F;
  --color-error-bg:          #F8E2E1;
  --color-error-text:        #7A2826;

  --color-ink:               #1B2330;
  --color-ink-2:             #4A5366;
  --color-ink-3:             #7A8294;
  --color-ink-4:             #A9AFBC;

  --color-paper:             #FAF8F4;
  --color-card:              #FFFFFF;
  --color-hairline:          #E5E1D8;
  --color-hairline-strong:   #D4CEC0;

  /* Schriftart: Nunito (Design-Default) wird selbstgehostet aus
     static/fonts/ ausgeliefert (siehe @font-face oben). Variable Font,
     deckt 400..800 ab. System-Stack bleibt als Fallback während des
     Ladens (font-display: swap) und auf Geräten ohne woff2. */
  --font-sans: 'Nunito', ui-rounded, 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SFMono-Regular', ui-monospace, 'Menlo', 'Consolas', monospace;

  --fw-regular: 400;
  --fw-medium:  500;
  --fw-semibold: 600;
  --fw-bold:    700;
  --fw-black:   800;

  --fs-display: 48px;
  --fs-task:    40px;
  --fs-h1:      32px;
  --fs-h2:      24px;
  --fs-body-lg: 20px;
  --fs-body:    18px;
  --fs-meta:    16px;
  --fs-caption: 14px;

  --lh-tight:   1.15;
  --lh-snug:    1.3;
  --lh-normal:  1.45;
  --lh-loose:   1.6;

  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;

  --r-sm:   8px;
  --r-md:   12px;
  --r-lg:   16px;
  --r-pill: 9999px;

  --shadow-1: 0 1px 2px rgba(27, 35, 48, 0.04), 0 2px 8px rgba(27, 35, 48, 0.04);
  --shadow-2: 0 4px 16px rgba(27, 35, 48, 0.08);

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-instant: 80ms;
  --dur-fast:    180ms;
  --dur-base:    220ms;
  --dur-slow:    400ms;

  --border-hairline: 1px solid var(--color-hairline);
  --border-input:    2px solid rgba(27, 35, 48, 0.12);
  --focus-ring:      0 0 0 3px rgba(47, 111, 235, 0.4);

  --content-max: 720px;
  --header-h:    72px;
  --progress-h:  8px;
  --hit-min:     44px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

button, input, select { font-family: inherit; }
button { cursor: pointer; }

.ds-root {
  min-height: 100vh;
}

.stage {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  border: none;
  border-radius: var(--r-md);
  font-weight: var(--fw-bold);
  transition: background var(--dur-fast) var(--ease),
              transform var(--dur-instant) var(--ease),
              box-shadow var(--dur-fast) var(--ease),
              color var(--dur-fast) var(--ease);
  min-height: var(--hit-min);
  text-decoration: none;
}
.btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: default; }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  padding: 14px 28px;
  font-size: var(--fs-body-lg);
  min-height: 56px;
}
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }
.btn-primary:active:not(:disabled) { background: var(--color-primary-press); }

.btn-secondary {
  background: transparent;
  color: var(--color-ink-2);
  padding: 12px 20px;
  font-size: var(--fs-meta);
  font-weight: var(--fw-semibold);
  border: 2px solid rgba(27, 35, 48, 0.12);
  min-height: 48px;
}
.btn-secondary:hover:not(:disabled) {
  background: rgba(27, 35, 48, 0.04);
  color: var(--color-ink);
}

.btn-pill {
  background: var(--color-primary);
  color: #fff;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  font-size: var(--fs-meta);
  font-weight: var(--fw-semibold);
  min-height: var(--hit-min);
}
.btn-pill:hover:not(:disabled) { background: var(--color-primary-hover); }

.btn-ghost {
  background: transparent;
  color: var(--color-ink-2);
  padding: 8px 14px;
  font-size: var(--fs-meta);
  font-weight: var(--fw-semibold);
  border-radius: var(--r-md);
  min-height: var(--hit-min);
}
.btn-ghost:hover:not(:disabled) {
  background: rgba(27, 35, 48, 0.04);
  color: var(--color-ink);
}

.button-row {
  display: flex;
  gap: var(--sp-3);
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Card ---------- */
.card {
  background: var(--color-card);
  border: var(--border-hairline);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  padding: var(--sp-5);
}

/* ---------- Inputs ---------- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.field label {
  font-size: var(--fs-meta);
  font-weight: var(--fw-semibold);
  color: var(--color-ink-2);
}
.field input, .field select {
  height: 56px;
  padding: 0 var(--sp-4);
  font-size: var(--fs-body-lg);
  font-weight: var(--fw-medium);
  color: var(--color-ink);
  background: var(--color-card);
  border: var(--border-input);
  border-radius: var(--r-md);
  outline: none;
  transition: border-color var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
}
.field input::placeholder { color: var(--color-ink-3); }
.field input:focus, .field select:focus {
  border-color: var(--color-primary);
  box-shadow: var(--focus-ring);
}

.answer-input {
  width: 240px;
  height: 64px;
  text-align: center;
  font: var(--fw-bold) 28px/1 var(--font-sans);
  font-variant-numeric: tabular-nums;
  border: var(--border-input);
  border-radius: var(--r-md);
  background: var(--color-card);
  color: var(--color-ink);
  outline: none;
  padding: 0 var(--sp-4);
  transition: border-color var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
}
.answer-input.text-answer {
  width: 100%;
  max-width: 440px;
  text-align: left;
  font-size: 24px;
}
.answer-input::placeholder {
  color: var(--color-ink-3);
  font-weight: var(--fw-bold);
}
.answer-input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--focus-ring);
}
.answer-input:disabled {
  background: rgba(27, 35, 48, 0.03);
  color: var(--color-ink-3);
}

/* ---------- Progress bar ---------- */
.progress-track {
  position: relative;
  height: var(--progress-h);
  background: var(--color-hairline);
  border-radius: var(--r-pill);
  overflow: visible;
}
.progress-fill {
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  border-radius: var(--r-pill);
  transition: width var(--dur-slow) var(--ease),
              background var(--dur-slow) var(--ease);
}
/* Glatter Verlauf statt drei Zonen: Bei kontinuierlicher Schwierigkeit
   gibt es keine Schwellen mehr (vorher 34/67/95). Der Gradient laeuft
   von Hellblau (KW=0) zu Dunkelblau (KW=100); Goldzone ab >=95 wird
   weiterhin per ``.progress-fill.gold`` umgeschaltet. */
.progress-fill.progress {
  background: linear-gradient(90deg, #9DC0F5 0%, #5A92EE 50%, #2660D4 100%);
}
.progress-fill.gold { background: var(--color-mastery); }
.progress-crown {
  position: absolute;
  right: -6px;
  top: -14px;
  font-size: 20px;
  animation: crown-pop 350ms var(--ease);
}
@keyframes crown-pop {
  from { transform: scale(0.6); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.progress-mini {
  position: relative;
  height: 6px;
  background: var(--color-hairline);
  border-radius: var(--r-pill);
  overflow: hidden;
}
.progress-mini .progress-fill { border-radius: var(--r-pill); }

/* Wrapper fuer Balken + nackte Punktzahl rechts daneben (Test-/Dev-Modus). */
.progress-with-value {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.progress-with-value .progress-track {
  flex: 1 1 auto;
  min-width: 0;
}
.progress-value {
  flex: 0 0 auto;
  min-width: 2.5ch;
  text-align: right;
  font-weight: var(--fw-semibold);
  font-size: var(--fs-meta);
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- App header ---------- */
.app-header {
  position: sticky;
  top: 0;
  background: var(--color-paper);
  z-index: 10;
  padding: var(--sp-4) var(--sp-6) 0;
  border-bottom: var(--border-hairline);
}
.app-header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
}
.header-context {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  padding: 14px 0;
}
.set-title {
  font-weight: var(--fw-semibold);
  font-size: var(--fs-meta);
  color: var(--color-ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.meta-right {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-meta);
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}
.meta-right svg { stroke: currentColor; }

/* ---------- Top bar (greeting + logout, login screen has none) ---------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-6);
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
}
.topbar .greeting {
  font-size: var(--fs-body-lg);
  font-weight: var(--fw-bold);
  color: var(--color-ink);
}

/* ---------- View container ---------- */
.view {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  padding: var(--sp-5) var(--sp-6) var(--sp-7);
}
.view-inner {
  width: 100%;
  max-width: var(--content-max);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

/* ---------- Login ---------- */
.login-shell {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6);
}
.login-card {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}
.login-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-2);
}
.login-brand .mark {
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  background: var(--color-primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--fw-black);
  font-size: 24px;
}
.login-brand .name {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  color: var(--color-ink);
}
.login-card h1 {
  margin: 0;
  font-size: var(--fs-h1);
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
  color: var(--color-ink);
}
.login-card .subtitle {
  margin: 0;
  font-size: var(--fs-body);
  color: var(--color-ink-2);
}
.login-card form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.dsgvo-hint {
  margin: 0;
  font-size: var(--fs-caption);
  color: var(--color-ink-3);
  line-height: var(--lh-normal);
}
.error-banner {
  background: var(--color-error-bg);
  color: var(--color-error-text);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-md);
  font-size: var(--fs-meta);
  font-weight: var(--fw-semibold);
}

/* ---------- Set tiles ---------- */
.tiles-header h1 {
  margin: 0;
  font-size: var(--fs-h1);
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
  color: var(--color-ink);
}
.tiles-header p {
  margin: var(--sp-2) 0 0;
  color: var(--color-ink-2);
  font-size: var(--fs-body);
}
.tiles {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.tile {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  background: var(--color-card);
  border: var(--border-hairline);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  padding: var(--sp-5);
  text-align: left;
  cursor: pointer;
  transition: transform var(--dur-instant) var(--ease),
              box-shadow var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease);
}
.tile:hover { box-shadow: var(--shadow-2); border-color: var(--color-hairline-strong); }
.tile:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.tile:active { transform: scale(0.99); }
.tile .titel {
  font-size: var(--fs-body-lg);
  font-weight: var(--fw-bold);
  color: var(--color-ink);
}
.tile .modus {
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  color: var(--color-ink-2);
}
.tile .progress-mini { margin-top: auto; }
.empty-state {
  background: var(--color-card);
  border: var(--border-hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-7);
  text-align: center;
  color: var(--color-ink-2);
  font-size: var(--fs-body);
}

/* ---------- Task area ---------- */
.task-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--sp-7) var(--sp-6);
  gap: var(--sp-7);
  max-width: var(--content-max);
  margin: 0 auto;
  width: 100%;
}
.task-display {
  font: var(--fw-bold) var(--fs-task)/1.3 var(--font-sans);
  font-variant-numeric: tabular-nums;
  text-align: center;
  color: var(--color-ink);
  margin: 0;
  white-space: pre-wrap;
}
.answer-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  align-items: center;
  width: 100%;
  /* Padding + Hintergrund stehen nur bei Bonus an — fuer regulaere
     Aufgaben transparent; spart eigene Container-Klasse. */
  padding: 0;
  border-radius: var(--r-lg);
  transition: background var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
}

/* ---------- Bonus-Aufgabe (Goldzone) ---------- */
/* Dezenter goldener Akzent fuer Bonus-Aufgaben: ein Tint-Hintergrund am
   Container, ⭐-Badge oben links. Kein Hover, kein Sound — Touch-only.
   Farb-Token --color-mastery ist die existierende Goldakzentfarbe aus dem
   Design-System (siehe :root). */
.answer-form--bonus {
  background: var(--color-mastery-tint);
  padding: var(--sp-4);
  box-shadow: inset 0 0 0 1px var(--color-mastery);
}
.bonus-badge {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-pill);
  background: var(--color-mastery);
  color: var(--color-ink);
  font-size: var(--fs-meta);
  font-weight: var(--fw-bold);
  letter-spacing: 0.02em;
  user-select: none;
}
.bonus-badge__star {
  font-size: var(--fs-body);
  line-height: 1;
}
/* Glow nach richtiger Bonus-Antwort: 700ms Aufleuchten + Ausklingen.
   Wird per JS (shell.js triggerBonusGlow) durch Hinzufuegen von
   ``answer-form--bonus-glow`` ausgeloest und nach ~800ms wieder entfernt,
   damit die naechste Bonus-Aufgabe den Effekt erneut zeigen kann. */
.answer-form--bonus.answer-form--bonus-glow {
  animation: bonus-glow 700ms var(--ease);
}
@keyframes bonus-glow {
  0%   { box-shadow: inset 0 0 0 1px var(--color-mastery),
                     0 0 0 0 rgba(232, 181, 58, 0.55); }
  35%  { box-shadow: inset 0 0 0 2px var(--color-mastery),
                     0 0 22px 6px rgba(232, 181, 58, 0.55); }
  100% { box-shadow: inset 0 0 0 1px var(--color-mastery),
                     0 0 0 0 rgba(232, 181, 58, 0.0); }
}
@media (prefers-reduced-motion: reduce) {
  /* Kein Glow fuer Schueler:innen mit Bewegungs-Empfindlichkeit; Badge
     bleibt sichtbar, das normale Feedback erscheint trotzdem. */
  .answer-form--bonus.answer-form--bonus-glow {
    animation: none;
  }
}

/* ---------- Feedback flash ---------- */
.feedback-zone {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  align-items: center;
  animation: feedback-in var(--dur-fast) var(--ease);
}
@keyframes feedback-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.feedback {
  width: 100%;
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  justify-content: center;
}
.feedback.success { background: var(--color-success-bg); }
.feedback.success .fb-text { color: var(--color-success-text); }
.feedback.caution { background: var(--color-caution-bg); }
.feedback.caution .fb-text { color: var(--color-caution-text); }
.feedback.error   { background: var(--color-error-bg); }
.feedback.error   .fb-text { color: var(--color-error-text); }
.fb-emoji { font-size: 28px; line-height: 1; flex-shrink: 0; }
.fb-text  {
  font: var(--fw-bold) 22px/1.3 var(--font-sans);
  text-align: center;
}
.feedback-detail {
  width: 100%;
  text-align: center;
  font-size: var(--fs-body);
  color: var(--color-ink-2);
  line-height: var(--lh-normal);
}
.feedback-detail strong {
  color: var(--color-ink);
  font-weight: var(--fw-bold);
}

/* ---------- Summary ---------- */
.summary {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}
.summary h1 {
  margin: 0;
  font-size: var(--fs-h1);
  letter-spacing: -0.01em;
  color: var(--color-ink);
}
.summary-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--sp-3);
}
.stat {
  background: var(--color-card);
  border: var(--border-hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
.stat .stat-label {
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  color: var(--color-ink-2);
}
.stat .stat-value {
  font-size: var(--fs-h1);
  font-weight: var(--fw-bold);
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}
.stat.success .stat-value { color: var(--color-success-text); }
.stat.error   .stat-value { color: var(--color-error-text); }
.stat.caution .stat-value { color: var(--color-caution-text); }

.compare-card {
  background: var(--color-card);
  border: var(--border-hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.compare-row {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.compare-row .compare-label {
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  color: var(--color-ink-2);
}

.fehlerprotokoll {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.fehlerprotokoll h2 {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: var(--fw-semibold);
  color: var(--color-ink);
}
.fehler-item {
  background: var(--color-card);
  border: var(--border-hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-4) var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.fehler-item .fehler-aufgabe {
  font-weight: var(--fw-bold);
  font-size: var(--fs-body-lg);
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}
.fehler-item .fehler-zeile {
  font-size: var(--fs-meta);
  color: var(--color-ink-2);
}
.fehler-item .fehler-zeile strong { color: var(--color-ink); font-weight: var(--fw-bold); }
.fehler-item.skipped { border-left: 4px solid var(--color-caution); }
.fehler-item.wrong   { border-left: 4px solid var(--color-error); }

/* ---------- Network error ---------- */
.network-banner {
  position: fixed;
  left: 50%;
  bottom: var(--sp-5);
  transform: translateX(-50%);
  background: var(--color-card);
  border: var(--border-hairline);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-2);
  padding: var(--sp-4) var(--sp-5);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--fs-meta);
  color: var(--color-ink);
  z-index: 100;
  max-width: calc(100vw - var(--sp-6));
}
.network-banner.error { border-left: 4px solid var(--color-error); }
.network-banner.warn  { border-left: 4px solid var(--color-caution); }

/* ---------- Loading state ---------- */
.loading {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink-3);
  font-size: var(--fs-body);
}

/* ---------- iPad-Querformat: kein Hover-Klebriges ---------- */
@media (hover: none) {
  .tile:hover { box-shadow: var(--shadow-1); border-color: var(--color-hairline); }
  .btn-primary:hover:not(:disabled) { background: var(--color-primary); }
  .btn-secondary:hover:not(:disabled) { background: transparent; color: var(--color-ink-2); }
}

/* ---------- Schmale Geräte (unter 768px) ---------- */
@media (max-width: 767px) {
  .task-display { font-size: 32px; }
  .view, .task-area { padding-left: var(--sp-4); padding-right: var(--sp-4); }
  .topbar, .app-header { padding-left: var(--sp-4); padding-right: var(--sp-4); }
  .answer-input { width: 100%; max-width: 320px; }
}

/* =========================================================
   Streak-Anzeige (Klasse-5-Gamification)
   ========================================================= */

.streak {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.7rem;
    border-radius: 999px;
    background: rgba(232, 181, 58, 0.18);
    color: #7B4E12;
    font-weight: 600;
    transition: opacity 220ms ease, transform 220ms ease;
    transform-origin: center;
    /* Standard sichtbar; .versteckt blendet aus. */
    opacity: 1;
}
.streak.versteckt {
    opacity: 0;
    transform: scale(0.85);
    pointer-events: none;
}

.streak-lead {
    font-size: 1.6rem;
    line-height: 1;
    display: inline-block;
}
.streak-ziffer {
    font-variant-numeric: tabular-nums;
    font-size: 1.1rem;
}

.streak-sammlung {
    display: inline-flex;
    align-items: center;
    gap: 0.1rem;
    margin-left: 0.4rem;
    flex-wrap: wrap;
    max-width: 16rem;
}
.streak-token {
    display: inline-block;
    font-size: 1.1rem;
    line-height: 1;
}

/* Stufen-Farbtoenungen */
.streak-stufe-muenze   { color: #C77B1A; }
.streak-stufe-stern    { color: #D9A40A; }
.streak-stufe-diamant  { color: #2F8FCC; }
.streak-stufe-krone    { color: #B58A22; }

/* Pop-Animation am Lead-Symbol bei Level-Up. */
@keyframes streak-pop {
    0%   { transform: scale(1);   }
    40%  { transform: scale(1.4); }
    100% { transform: scale(1);   }
}
.streak-lead.pop {
    animation: streak-pop 320ms ease-out;
}

/* Muenzwurf: von oben einfallen */
@keyframes streak-werfen {
    0%   { transform: translateY(-60px) rotate(-15deg); opacity: 0; }
    100% { transform: translateY(0) rotate(0deg);       opacity: 1; }
}
.streak-token.werfen {
    animation: streak-werfen 400ms ease-out both;
}

/* Level-Up-Shake auf bisherige Sammel-Symbole. */
@keyframes streak-shake {
    0%, 100% { transform: translateX(0); }
    25%      { transform: translateX(-2px) rotate(-4deg); }
    50%      { transform: translateX(2px)  rotate(4deg); }
    75%      { transform: translateX(-2px) rotate(-2deg); }
}
.streak-token.shake {
    animation: streak-shake 200ms ease-in-out;
}

/* Reset: alle Symbole fliegen nach unten weg. */
@keyframes streak-weg {
    0%   { transform: translateY(0);    opacity: 1; }
    100% { transform: translateY(60px); opacity: 0; }
}
.streak-token.weg {
    animation: streak-weg 300ms ease-in both;
}

/* Streak-Spruch unterhalb des Feedback-Banners */
.feedback-streak {
    margin-top: 0.5rem;
    padding: 0.45rem 0.8rem;
    border-radius: 8px;
    background: rgba(232, 181, 58, 0.15);
    color: #7B4E12;
    font-weight: 600;
    text-align: center;
}

/* Symbol-Kette in der Zusammenfassung */
.summary-streak {
    margin-top: 1rem;
    text-align: center;
}
.summary-streak-kette {
    font-size: 1.6rem;
    letter-spacing: 0.05em;
    line-height: 1.2;
}
.summary-streak-text {
    margin-top: 0.4rem;
    color: var(--color-ink-2, #4A5366);
    font-weight: 600;
}


/* =========================================================
   Praeferenzen: Theme/Schriftart/Schriftgroesse-Selektoren
   =========================================================
   Alle Werte stammen aus app/preferences/items_registry.py. Die Selektoren
   greifen, sobald das Frontend ``data-theme``, ``data-font`` bzw.
   ``data-fs`` am `<html>`-Element setzt (siehe applets/core/einstellungen.js).
   ``klassisch``/``standard``/``normal`` sind die Defaults und kommen ohne
   Override aus — sie greifen auf die `:root`-Werte oben zurueck. */

:root[data-theme="ozean"] {
    --color-paper:           #E7F1FA;
    --color-card:             #FFFFFF;
    --color-primary:          #1E78B4;
    --color-primary-hover:    #176798;
    --color-primary-press:    #0F567E;
    --color-primary-tint:     rgba(30, 120, 180, 0.14);
    --color-ink:              #0E2A3F;
    --color-ink-2:            #345268;
    --color-ink-3:            #5E7A8E;
    --color-ink-4:            #9BB1BF;
    --color-hairline:         #C7DCEC;
    --color-hairline-strong:  #A6C5DC;
}

:root[data-theme="wald"] {
    --color-paper:           #ECF3E5;
    --color-card:             #FBFEFA;
    --color-primary:          #2E7D52;
    --color-primary-hover:    #256A44;
    --color-primary-press:    #1C5736;
    --color-primary-tint:     rgba(46, 125, 82, 0.14);
    --color-ink:              #14301E;
    --color-ink-2:            #365142;
    --color-ink-3:            #5E7868;
    --color-ink-4:            #9CAFA1;
    --color-hairline:         #CFE0BD;
    --color-hairline-strong:  #A9C593;
}

:root[data-theme="sonnenuntergang"] {
    --color-paper:           #FFF1E6;
    --color-card:             #FFFAF4;
    --color-primary:          #C95402;
    --color-primary-hover:    #A84602;
    --color-primary-press:    #823600;
    --color-primary-tint:     rgba(201, 84, 2, 0.16);
    --color-ink:              #3F1D04;
    --color-ink-2:            #6A3E1F;
    --color-ink-3:            #90644A;
    --color-ink-4:            #BFA08C;
    --color-hairline:         #F1D7BE;
    --color-hairline-strong:  #E0BC99;
}

:root[data-theme="mitternacht"] {
    --color-paper:           #1B2330;
    --color-card:             #252C3A;
    --color-primary:          #6FA0FF;
    --color-primary-hover:    #88B2FF;
    --color-primary-press:    #5A8DE8;
    --color-primary-tint:     rgba(111, 160, 255, 0.18);
    --color-ink:              #F2EFE6;
    --color-ink-2:            #C9CDD6;
    --color-ink-3:            #969BA8;
    --color-ink-4:            #5F6573;
    --color-hairline:         #3A4150;
    --color-hairline-strong:  #4A5263;
}

:root[data-theme="kirschblute"] {
    --color-paper:           #FCEEF1;
    --color-card:             #FFFAFB;
    --color-primary:          #B53269;
    --color-primary-hover:    #9C2858;
    --color-primary-press:    #7E1F46;
    --color-primary-tint:     rgba(181, 50, 105, 0.14);
    --color-ink:              #3A0F22;
    --color-ink-2:            #5E2B40;
    --color-ink-3:            #85586C;
    --color-ink-4:            #B895A4;
    --color-hairline:         #EFD3DC;
    --color-hairline-strong:  #DDAFBF;
}

:root[data-theme="pastell"] {
    --color-paper:           #F4F0FF;
    --color-card:             #FFFCFF;
    --color-primary:          #5B49B4;
    --color-primary-hover:    #4D3CA0;
    --color-primary-press:    #3D2F86;
    --color-primary-tint:     rgba(91, 73, 180, 0.14);
    --color-ink:              #1F1641;
    --color-ink-2:            #41365E;
    --color-ink-3:            #6C6280;
    --color-ink-4:            #A099B0;
    --color-hairline:         #DCD3F1;
    --color-hairline-strong:  #C3B6E2;
}

:root[data-font="klar"] {
    --font-sans: Verdana, Tahoma, 'DejaVu Sans', 'Trebuchet MS',
                 Geneva, sans-serif;
}
:root[data-font="klassisch"] {
    --font-sans: Georgia, 'Iowan Old Style', 'Apple Garamond',
                 Cambria, 'Times New Roman', serif;
}

:root[data-fs="klein"] {
    --fs-display:  42px;
    --fs-task:     34px;
    --fs-h1:       28px;
    --fs-h2:       21px;
    --fs-body-lg:  18px;
    --fs-body:     16px;
    --fs-meta:     14px;
    --fs-caption:  13px;
}
:root[data-fs="gross"] {
    --fs-display:  56px;
    --fs-task:     46px;
    --fs-h1:       36px;
    --fs-h2:       28px;
    --fs-body-lg:  23px;
    --fs-body:     21px;
    --fs-meta:     18px;
    --fs-caption:  16px;
}


/* =========================================================
   Settings-Screen (eigene Route /einstellungen)
   ========================================================= */

.settings-shell {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: var(--sp-5) var(--sp-5) var(--sp-7);
    display: flex;
    flex-direction: column;
    gap: var(--sp-6);
}

.settings-back {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    background: transparent;
    border: 2px solid var(--color-hairline-strong);
    border-radius: var(--r-pill);
    color: var(--color-ink);
    padding: 10px 18px;
    font-size: var(--fs-meta);
    font-weight: var(--fw-semibold);
    min-height: var(--hit-min);
}
.settings-back:active:not(:disabled) { transform: scale(0.97); }

.settings-heading h1 {
    margin: 0;
    font-size: var(--fs-h1);
    font-weight: var(--fw-black);
    color: var(--color-ink);
}
.settings-heading p {
    margin: var(--sp-2) 0 0;
    color: var(--color-ink-2);
    font-size: var(--fs-body);
}

.settings-section {
    background: var(--color-card);
    border: var(--border-hairline);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-1);
    padding: var(--sp-5);
}
.settings-section h2 {
    margin: 0 0 var(--sp-4);
    font-size: var(--fs-h2);
    font-weight: var(--fw-bold);
    color: var(--color-ink);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--sp-4);
}

.settings-tile {
    position: relative;
    background: var(--color-paper);
    border: 2px solid var(--color-hairline);
    border-radius: var(--r-md);
    padding: var(--sp-4);
    text-align: left;
    color: var(--color-ink);
    font-family: inherit;
    font-size: var(--fs-meta);
    min-height: 120px;
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    transition: border-color var(--dur-fast) var(--ease),
                background var(--dur-fast) var(--ease),
                transform var(--dur-instant) var(--ease);
}
.settings-tile:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.settings-tile:active:not(.is-locked) { transform: scale(0.98); }

.settings-tile.is-active {
    border-color: var(--color-primary);
    background: var(--color-primary-tint);
}
.settings-tile.is-active::after {
    content: "";
    position: absolute;
    top: 8px;
    right: 8px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--color-primary);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='none' stroke='white' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round' d='M3 8l3 3 7-7'/></svg>");
    background-size: 14px 14px;
    background-repeat: no-repeat;
    background-position: center;
}

.settings-tile.is-locked {
    cursor: not-allowed;
    opacity: 0.55;
}
.settings-tile.is-locked::after {
    content: "🔒";
    position: absolute;
    top: 8px;
    right: 10px;
    font-size: 16px;
}

.settings-tile-name {
    font-weight: var(--fw-bold);
    font-size: var(--fs-meta);
    color: var(--color-ink);
}

.theme-swatch {
    display: flex;
    border-radius: var(--r-sm);
    overflow: hidden;
    height: 48px;
    border: 1px solid var(--color-hairline);
}
.theme-swatch span { flex: 1; }

.font-preview, .size-preview {
    color: var(--color-ink);
    line-height: 1.2;
    /* Vorschau-Texte sollen sich klar voneinander abheben — fest gerahmte
       Box statt freier Text, damit auch die "Klar"-Schriftart deutlich
       als Wechsel erkennbar ist. */
    background: var(--color-card);
    border: var(--border-hairline);
    border-radius: var(--r-sm);
    padding: var(--sp-3) var(--sp-4);
    font-weight: var(--fw-bold);
}
/* Schriftart-Vorschau nutzt die font-family der Kachel via inline-style. */
.font-preview { font-size: 22px; }
/* Schriftgroessen-Vorschau bekommt die Groesse via inline-style. */
.size-preview { font-weight: var(--fw-semibold); }

.avatar-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: 96px;
    align-self: center;
}
.avatar-preview svg {
    width: 100%;
    height: 100%;
    display: block;
}


/* =========================================================
   Topbar-Avatar + Settings-Button
   ========================================================= */

.topbar-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    margin-right: var(--sp-3);
    border: 2px solid var(--color-hairline-strong);
    background: var(--color-card);
    flex: 0 0 auto;
}
.topbar-avatar svg {
    width: 100%;
    height: 100%;
    display: block;
}

.topbar .greeting-row {
    display: inline-flex;
    align-items: center;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--hit-min);
    height: var(--hit-min);
    border-radius: var(--r-pill);
    background: transparent;
    color: var(--color-ink-2);
    border: none;
    padding: 0;
}
.btn-icon:hover:not(:disabled) {
    background: var(--color-primary-tint);
    color: var(--color-ink);
}
.btn-icon:focus-visible { outline: none; box-shadow: var(--focus-ring); }