/* ==========================================================================
   Flashcards View — modernisiert, token-only, mobile-first
   ========================================================================== */

@keyframes flashcard-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.flashcards {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.flashcards__stage {
  width: 100%;
  display: flex;
  justify-content: center;
}

/* --------------------------------------------------------------------------
   Progress oben — dezent, mit Sub-Label
   -------------------------------------------------------------------------- */

.flashcard__progress {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.flashcard__progress-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.flashcard__progress-bar {
  width: 100%;
  height: 6px;
  background: var(--color-surface-muted);
  border-radius: 999px;
  overflow: hidden;
}

.flashcard__progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 999px;
  transition: width 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   Card — größer, zentriert, dezenter Schatten, 3D-Flip
   -------------------------------------------------------------------------- */

.flashcard {
  width: 100%;
  max-width: 480px;
  min-height: 320px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  animation: flashcard-fade-in 250ms ease-out;
  transition: box-shadow 200ms ease, transform 200ms ease;
}

.flashcard:hover {
  box-shadow: var(--shadow-lg);
}

/* Optionale 3D-Flip-Variante (falls verwendet) */
.flashcard__inner {
  position: relative;
  width: 100%;
  min-height: 320px;
  transition: transform 500ms cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
}

.flashcard.is-flipped .flashcard__inner {
  transform: rotateY(180deg);
}

/* --------------------------------------------------------------------------
   Subject-Badge (oben in der Karte)
   -------------------------------------------------------------------------- */

.flashcard__subject {
  align-self: flex-start;
  margin: 0;
  padding: 0.3rem 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 999px;
}

/* --------------------------------------------------------------------------
   Front — Begriff zentral, sehr groß, bold
   -------------------------------------------------------------------------- */

.flashcard__front {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex: 1;
  min-height: 160px;
  padding: 1rem 0.5rem;
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   Divider zwischen Front und Back
   -------------------------------------------------------------------------- */

.flashcard__divider {
  width: 100%;
  margin: 0;
  border: 0;
  border-top: 1px dashed var(--color-border);
}

/* --------------------------------------------------------------------------
   Back — Definition lesbar
   -------------------------------------------------------------------------- */

.flashcard__back {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  padding: 0.5rem 0.25rem;
}

/* Beispiel-Box im Back */
.flashcard__examples {
  background: var(--color-info-bg);
  border: 1px solid var(--color-info-border);
  border-left: 4px solid var(--color-info-text);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  color: var(--color-info-text);
  font-size: 0.92rem;
  line-height: 1.55;
}

.flashcard__examples summary {
  cursor: pointer;
  font-weight: 700;
  margin-bottom: 0.4rem;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.flashcard__examples summary::before {
  content: "\0025B8";
  display: inline-block;
  transition: transform 150ms ease;
}

.flashcard__examples[open] summary::before {
  transform: rotate(90deg);
}

.flashcard__examples ul {
  margin: 0;
  padding-left: 1.25rem;
}

.flashcard__examples li {
  margin-top: 0.25rem;
}

/* --------------------------------------------------------------------------
   Tags
   -------------------------------------------------------------------------- */

.flashcard__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.flashcard__tags li {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.25rem 0.65rem;
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

/* Legacy single-tag */
.flashcard__tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  background: var(--color-info-bg);
  color: var(--color-info-text);
  border-radius: 999px;
}

/* --------------------------------------------------------------------------
   Actions — 4 farbcodierte gleichgroße Cards mit Icon + Label + Hint
   -------------------------------------------------------------------------- */

.flashcard__actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  width: 100%;
  margin-top: auto;
}

.flashcard__actions:has(> .btn:only-child) {
  grid-template-columns: 1fr;
}

/* Generischer Action-Button (legacy + neuer Stil) */
.flashcard__action,
.flashcard__actions .btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  min-height: 64px;
  padding: 0.65rem 0.5rem;
  border: 2px solid transparent;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--color-primary-contrast);
  box-shadow: var(--shadow-sm);
  transition: transform 150ms ease, box-shadow 150ms ease, filter 150ms ease;
}

.flashcard__action:hover,
.flashcard__actions .btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
  box-shadow: var(--shadow-md);
}

.flashcard__action:active,
.flashcard__actions .btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.flashcard__action:focus-visible,
.flashcard__actions .btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

/* Hint (Tastatur-Hinweis) im Button */
.flashcard__actions .btn__hint,
.flashcard__action .btn__hint {
  font-size: 0.7rem;
  font-weight: 500;
  opacity: 0.85;
  letter-spacing: 0.02em;
}

/* Farbcodes (legacy + via class) */
.flashcard__action--again,
.flashcard__actions .btn--again,
.flashcard__actions .btn--danger {
  background: var(--color-danger);
  border-color: var(--color-danger);
  color: var(--color-danger-contrast);
}

.flashcard__action--hard,
.flashcard__actions .btn--hard,
.flashcard__actions .btn--warning {
  background: var(--color-warning);
  border-color: var(--color-warning);
  color: var(--color-on-accent);
}

.flashcard__action--good,
.flashcard__actions .btn--good,
.flashcard__actions .btn--success {
  background: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-on-accent);
}

.flashcard__action--easy,
.flashcard__actions .btn--easy,
.flashcard__actions .btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-contrast);
}

/* --------------------------------------------------------------------------
   Empty-State / Done-State — zentriertes Icon, freundlicher Text, Action
   -------------------------------------------------------------------------- */

.flashcard--empty,
.flashcard--done {
  width: 100%;
  max-width: 480px;
  min-height: 320px;
  padding: 2.5rem 1.5rem;
  background: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
}

.flashcard--empty::before,
.flashcard--done::before {
  content: "\01F389";
  font-size: 3rem;
  line-height: 1;
}

.flashcard--empty::before {
  content: "\01F4DA";
}

.flashcard__message {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

.flashcard__hint {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.flashcard__empty {
  width: 100%;
  max-width: 480px;
  padding: 3rem 1.5rem;
  background: var(--color-surface);
  border-radius: 12px;
  border: 2px dashed var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}

.flashcard__empty-icon {
  font-size: 2.75rem;
  line-height: 1;
}

.flashcard__empty-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
}

.flashcard__empty-text {
  font-size: 0.95rem;
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   Mobile
   -------------------------------------------------------------------------- */

@media (max-width: 480px) {
  .flashcards {
    padding: 0.5rem;
    gap: 1rem;
  }

  .flashcard,
  .flashcard--empty,
  .flashcard--done {
    padding: 1.5rem 1.25rem;
    min-height: 300px;
  }

  .flashcard__front {
    font-size: 1.5rem;
    min-height: 140px;
  }

  .flashcard__back {
    font-size: 0.95rem;
  }

  .flashcard__actions {
    grid-template-columns: repeat(2, 1fr);
  }

  .flashcard__action,
  .flashcard__actions .btn {
    min-height: 60px;
    padding: 0.7rem 0.4rem;
  }
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .flashcard,
  .flashcard__inner,
  .flashcard__progress-fill,
  .flashcard__action,
  .flashcard__actions .btn,
  .flashcard__examples summary::before {
    transition: none;
    animation: none;
  }
}