/* ============================================================
   FLASHCARDS — flashcards.html specific styles
   ============================================================ */

.flashcards-page {
  min-height: calc(100vh - var(--header-h));
  background: var(--sw-light-bg);
  padding: 32px 0 60px;
}

/* Controls bar */
.fc-controls {
  background: #fff;
  border-bottom: 1px solid var(--sw-border);
  padding: 14px 0;
  position: sticky;
  top: var(--header-h);
  z-index: 50;
  box-shadow: var(--shadow-sm);
}
.fc-controls-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.fc-filter {
  display: flex;
  align-items: center;
  gap: 8px;
}
.fc-filter select {
  padding: 7px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--sw-border);
  background: #fff;
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
}
.fc-filter select:focus { border-color: var(--sw-blue); }

.fc-stats {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.875rem;
}
.fc-stat { color: var(--text-muted); }
.fc-stat strong { color: var(--text-primary); }
.fc-stat.known strong { color: var(--sw-success); }

.fc-actions {
  display: flex;
  gap: 8px;
}

/* Main area */
.flashcards-body {
  padding: 40px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Counter */
.fc-counter {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  text-align: center;
}

/* The Card */
.flashcard-wrap {
  perspective: 1000px;
  width: 100%;
  max-width: 620px;
  height: 300px;
  margin-bottom: 24px;
  cursor: pointer;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.flashcard-wrap.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  text-align: center;
}
.flashcard-front {
  background: #fff;
  border: 2px solid var(--sw-blue);
}
.flashcard-back {
  background: linear-gradient(135deg, var(--sw-dark), var(--sw-dark-alt));
  border: 2px solid var(--sw-dark-3);
  transform: rotateY(180deg);
}

.fc-face-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.flashcard-front .fc-face-label { color: var(--sw-blue); }
.flashcard-back  .fc-face-label { color: rgba(255,255,255,0.4); }

.fc-face-text {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.5;
}
.flashcard-front .fc-face-text { color: var(--text-primary); }
.flashcard-back  .fc-face-text { color: #fff; }

.fc-flip-hint {
  font-size: 0.75rem;
  margin-top: 16px;
  opacity: 0.5;
}
.flashcard-front .fc-flip-hint { color: var(--text-muted); }
.flashcard-back  .fc-flip-hint { color: rgba(255,255,255,0.4); }

/* Module tag on card */
.fc-module-tag {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 0.72rem;
  font-weight: 600;
  opacity: 0.5;
}

/* Navigation */
.fc-nav {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.fc-nav .btn { min-width: 100px; }

.btn-known {
  background: var(--sw-success);
  color: #fff;
  border-color: var(--sw-success);
}
.btn-known:hover:not(:disabled) {
  background: #1e8c38;
  border-color: #1e8c38;
  box-shadow: 0 4px 12px rgba(40,167,69,0.3);
}

/* Progress bar for flashcards */
.fc-progress-area {
  width: 100%;
  max-width: 620px;
  margin-bottom: 12px;
}
.fc-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

/* Empty state */
.fc-empty {
  text-align: center;
  padding: 60px 20px;
}
.fc-empty h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.fc-empty p  { color: var(--text-muted); margin-bottom: 20px; }

/* All Known state */
.fc-all-known {
  text-align: center;
  background: #fff;
  border-radius: var(--radius-xl);
  border: 2px solid var(--sw-success);
  box-shadow: var(--shadow);
  padding: 48px 32px;
  max-width: 500px;
  width: 100%;
}
.fc-all-known h3 { font-size: 1.4rem; font-weight: 800; color: var(--sw-success); margin-bottom: 8px; }
.fc-all-known p  { color: var(--text-muted); margin-bottom: 20px; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 600px) {
  .fc-controls-inner { flex-direction: column; align-items: flex-start; }
  .flashcard-wrap { height: 250px; }
  .fc-face-text { font-size: 1rem; }
  .fc-nav { flex-wrap: wrap; justify-content: center; }
}