/* ============================================
   FLASHCARDS — Estilos de repaso SRS
   ============================================ */

/* ── Barra de filtros de nivel ── */
.fc-level-bar {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: .75rem 0;
}
.fc-level-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.fc-level-label {
  font-size: .875rem;
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
}
.fc-level-filters {
  display: flex;
  gap: .4rem;
  flex-wrap: wrap;
}
.fc-level-btn {
  padding: .35rem .9rem;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  font-size: .8125rem;
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.fc-level-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.fc-level-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ── Botón audio en tarjeta ── */
.fc-audio-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  transition: transform var(--transition);
  display: block;
  margin: .5rem auto;
}
.fc-audio-btn:hover { transform: scale(1.2); }

.fc-main {
  min-height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem var(--container-pad);
  gap: 2rem;
}

/* ── Estado vacío / completado ── */
.fc-empty,
.fc-done {
  text-align: center;
  max-width: 480px;
}
.fc-empty-icon,
.fc-done-icon {
  font-size: 4rem;
  margin-bottom: 1.25rem;
  line-height: 1;
}
.fc-empty h2,
.fc-done h2 {
  font-size: clamp(1.4rem, 3vw, 1.875rem);
  margin-bottom: .75rem;
}
.fc-empty p,
.fc-done p {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.fc-done-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin: 1.5rem 0;
}
.fcd-item { display: flex; flex-direction: column; align-items: center; gap: .2rem; }
.fcd-num {
  font-size: 2.5rem;
  font-weight: var(--weight-bold);
  color: var(--color-primary);
  line-height: 1;
}
.fcd-label { font-size: .8125rem; color: var(--color-text-muted); }

/* ── Sesión activa ── */
.fc-session {
  width: 100%;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.fc-header {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.fc-progress-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.fc-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.fc-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}
.fc-progress-text {
  font-size: .8125rem;
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
  flex-shrink: 0;
  min-width: 3.5rem;
  text-align: right;
}
.fc-stats-row {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}
.fc-stat {
  font-size: .875rem;
  font-weight: var(--weight-semi);
  display: flex;
  align-items: center;
  gap: .3rem;
}
.correct-stat { color: var(--color-accent); }
.wrong-stat   { color: var(--color-danger); }

/* ── Tarjeta ── */
.fc-card-wrap {
  width: 100%;
  perspective: 1000px;
}
.fc-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 3rem 2.5rem;
  text-align: center;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  box-shadow: var(--shadow-lg);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.fc-card.card-correct {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(5, 150, 105, .12), var(--shadow-lg);
}
.fc-card.card-wrong {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 4px rgba(220, 38, 38, .1), var(--shadow-lg);
}

.fc-card-level {
  display: inline-block;
  font-size: .7rem;
  font-weight: var(--weight-bold);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-lt);
  padding: .25rem .75rem;
  border-radius: var(--radius-full);
}
.fc-card-word {
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: var(--weight-bold);
  color: var(--color-text);
  line-height: 1.1;
  letter-spacing: -.02em;
}
.fc-card-phonetic {
  font-size: 1rem;
  color: var(--color-text-light);
  font-style: italic;
}
.fc-reveal-btn {
  margin-top: .5rem;
  font-size: .875rem;
}

.fc-card-back {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  animation: fadeSlide .2s ease forwards;
}
.fc-card-translation {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: var(--weight-semi);
  color: var(--color-primary);
  line-height: 1.2;
}
.fc-card-example {
  font-size: .9375rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  padding: .75rem 1rem;
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Botones de calificación ── */
.fc-rating {
  width: 100%;
  text-align: center;
}
.fc-rating-label {
  font-size: .875rem;
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
  margin-bottom: .875rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.fc-rating-btns {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: .625rem;
}
.fc-rating-btn {
  padding: .75rem .5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: .8125rem;
  font-weight: var(--weight-semi);
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  line-height: 1.3;
}
.btn-wrong {
  background: #fee2e2;
  color: var(--color-danger);
  border-color: #fecaca;
}
.btn-wrong:hover {
  background: #fecaca;
  transform: translateY(-1px);
}
.btn-hard {
  background: #fef3c7;
  color: #92400e;
  border-color: #fde68a;
}
.btn-hard:hover {
  background: #fde68a;
  transform: translateY(-1px);
}
.btn-good {
  background: var(--color-primary-lt);
  color: var(--color-primary);
  border-color: #bfdbfe;
}
.btn-good:hover {
  background: #bfdbfe;
  transform: translateY(-1px);
}
.btn-easy {
  background: var(--color-accent-lt);
  color: var(--color-accent);
  border-color: #a7f3d0;
}
.btn-easy:hover {
  background: #a7f3d0;
  transform: translateY(-1px);
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .fc-card { padding: 2rem 1.5rem; min-height: 240px; }
  .fc-rating-btns { grid-template-columns: 1fr 1fr; }
}