/* flashcards.css — Phase 10: fullscreen SRS review session */

.flashcard-view {
  position: fixed;
  inset: 0;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 24px 48px;
  overflow-y: auto;
  z-index: 50;
}

/* Top bar: back / counter / class tag */
.flashcard-top {
  width: 100%;
  max-width: 1100px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
}
.flashcard-top .fc-counter {
  font-size: var(--fs-base);
  color: var(--text-2);
  text-align: center;
  letter-spacing: 0.02em;
}
.flashcard-top .fc-counter b {
  color: var(--text);
  font-weight: 600;
}
.flashcard-top .fc-counter .fc-sub {
  color: var(--text-3);
  margin-left: 6px;
}
.fc-class-tag {
  text-align: right;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* The card itself */
.flashcard-card {
  width: 100%;
  max-width: 640px;
  min-height: 280px;
  background: var(--bg-2);
  border: 1px solid var(--border-hi);
  border-radius: var(--r-xl);
  padding: 60px 56px;
  margin: 0 auto 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: 0 1px 0 rgba(255,255,255,0.02) inset;
}
.flashcard-front {
  font-size: 24px;
  line-height: 1.45;
  color: var(--text);
  font-weight: 500;
}
.flashcard-back {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border-hi);
  font-size: 18px;
  line-height: 1.55;
  color: var(--text-2);
  white-space: pre-wrap;
}
.flashcard-source {
  margin-top: 18px;
  font-size: var(--fs-sm);
  color: var(--text-3);
  font-style: italic;
}

/* Reveal button (front-only state) */
.fc-reveal-btn {
  min-width: 200px;
  padding: 12px 24px;
  font-size: var(--fs-lg);
  margin-bottom: 12px;
}

/* Grade button row */
.flashcard-grade-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 640px;
  margin-bottom: 14px;
}
.grade-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 16px 12px;
  background: var(--bg-2);
  border: 1px solid var(--border-hi);
  border-radius: var(--r-md);
  color: var(--text);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
  font-family: inherit;
}
.grade-btn:hover {
  transform: translateY(-2px);
  background: var(--bg-3);
}
.grade-btn .g-label {
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.grade-btn .g-days {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}
.grade-btn.again      { border-color: rgba(239, 68, 68, 0.45); }
.grade-btn.again:hover{ border-color: var(--red); background: rgba(239, 68, 68, 0.08); }
.grade-btn.hard       { border-color: rgba(234, 179, 8, 0.45); }
.grade-btn.hard:hover { border-color: var(--yellow); background: rgba(234, 179, 8, 0.08); }
.grade-btn.good       { border-color: rgba(59, 130, 246, 0.45); }
.grade-btn.good:hover { border-color: var(--accent); background: rgba(59, 130, 246, 0.08); }
.grade-btn.easy       { border-color: rgba(34, 197, 94, 0.45); }
.grade-btn.easy:hover { border-color: var(--green); background: rgba(34, 197, 94, 0.08); }

/* Hint line under buttons */
.fc-hint {
  font-size: var(--fs-sm);
  color: var(--text-3);
  text-align: center;
  margin-top: 4px;
}
.fc-hint kbd {
  font-family: var(--font-mono);
  background: var(--bg-3);
  border: 1px solid var(--border-hi);
  border-radius: var(--r-sm);
  padding: 1px 6px;
  font-size: var(--fs-xs);
  color: var(--text-2);
}

/* Empty + done screens */
.flashcard-empty,
.flashcard-done {
  margin-top: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 480px;
  gap: 12px;
}
.flashcard-empty h2,
.flashcard-done h2 {
  margin: 8px 0 0;
  font-size: var(--fs-3xl);
  font-weight: 600;
  color: var(--text);
}
.flashcard-empty p,
.flashcard-done p {
  margin: 0;
  color: var(--text-3);
  font-size: var(--fs-base);
  line-height: 1.5;
}
.fc-empty-icon,
.fc-done-check {
  margin-bottom: 8px;
}
.fc-done-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

/* fc-picker — class chooser before flashcard drill */
.fc-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.fc-picker-card {
  background: var(--surface-2, #1a1a1a);
  border: 1px solid var(--border, #333);
  border-radius: 10px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 120ms ease;
}
.fc-picker-card:hover { border-color: var(--accent, #4a9); }
.fc-picker-title {
  font-size: var(--fs-xl);
  font-weight: 600;
  color: var(--text);
}
.fc-picker-stats { display: flex; gap: 16px; }
.fc-stat { color: var(--text-3); font-size: var(--fs-sm); }
.fc-stat b { color: var(--text); font-weight: 600; }
.fc-stat.urgent b { color: #fc6; }
.fc-picker-mods {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.fc-mod-chip {
  font-size: var(--fs-xs, 11px);
  padding: 3px 8px;
  background: var(--surface-3, #222);
  border-radius: 4px;
  color: var(--text-3);
}
.fc-mod-chip b { color: var(--text); margin-left: 4px; }
.fc-picker-actions {
  display: flex;
  gap: 8px;
  margin-top: auto;
}
.fc-picker-actions .btn { flex: 1; }