/* ── Stats bar ── */
.fc-stats-wrap {
  position: relative;
  margin-bottom: 8px;
}
.fc-stats {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.fc-stats::-webkit-scrollbar { display: none; }

.fc-stats-scroll-hint {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 36px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: linear-gradient(to right, transparent, var(--bg) 60%);
  color: var(--text-muted);
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.fc-stats-scroll-hint.hidden {
  opacity: 0;
}

@media (min-width: 768px) {
  .fc-stats {
    overflow: visible;
  }
  .fc-stats-scroll-hint { display: none; }
}
.fc-stats-left { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.fc-badges { display: flex; gap: 10px; align-items: center; flex-shrink: 0; margin-left: auto; }

/* ── Progress counter ── */
.fc-counter {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Badges ── */
.fc-badge {
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.75rem;
  white-space: nowrap;
  flex-shrink: 0;
}
.fc-badge [data-lucide] { flex-shrink: 0; }
.fc-badge span {
  display: inline-block;
  text-align: center;
}
.fc-counter span {
  display: inline-block;
  text-align: center;
}
.fc-badge-label { /* label text inside badge */ }
.fc-badge.good { background: rgba(34,197,94,.15); color: var(--good); border: 1px solid var(--good); }
.fc-badge.bad  { background: rgba(244,63,94,.15);  color: var(--bad);  border: 1px solid var(--bad); }
.fc-badge.clickable { cursor: pointer; touch-action: manipulation; }
.fc-badge.clickable:active { opacity: 0.7; }

/* ── Small screens: hide badge icons, filter text only ── */
@media (max-width: 440px) {
  .fc-badge [data-lucide] { display: none; }
  .fc-filter-label { display: none; }
  .fc-filter-trigger { max-width: none; }
}

/* ── Session answer list ── */
.fc-session-list-wrap {
  position: relative;
  margin-bottom: 16px;
}
.fc-session-list-wrap.hidden { display: none; }
.fc-session-list {
  max-height: 220px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
/* Fade + arrow at bottom to invite scrolling */
.fc-session-scroll-hint {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 48px;
  background: linear-gradient(transparent, var(--bg));
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 4px;
  pointer-events: none;
  transition: opacity var(--transition);
}
.fc-session-scroll-hint.hidden { opacity: 0; }

.fc-list-toggle {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  touch-action: manipulation;
  transition: all var(--transition);
}
.fc-list-toggle.active {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}
.fc-list-toggle:active { opacity: 0.7; }

/* ── Progress bar ── */
.fc-progress-wrap {
  background: var(--surface2);
  border-radius: 999px;
  height: 5px;
  overflow: hidden;
  margin-bottom: 8px;
}
.fc-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 999px;
  transition: width 0.4s ease;
}

/* ══════════════════════════════════════
   FILTER TRIGGER (in stats bar)
   ══════════════════════════════════════ */

.fc-filter-trigger {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 3px 8px;
  height: 28px;
  max-width: 130px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
  transition: all var(--transition);
}
.fc-filter-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.fc-filter-chevron {
  flex-shrink: 0;
  display: inline-flex;
  transition: transform var(--transition);
}
.fc-filter-trigger.active {
  border-color: var(--accent);
}
.fc-filter-trigger:active { opacity: 0.7; }
.fc-filter-trigger.active .fc-filter-chevron {
  transform: rotate(180deg);
}

/* ══════════════════════════════════════
   FILTER MENU (drawer mobile / dropdown desktop)
   ══════════════════════════════════════ */

/* Overlay (portaled to body) */
.fc-filter-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,.5);
  animation: fc-overlay-in 0.2s ease;
}
.fc-filter-overlay.open { display: block; }
@keyframes fc-overlay-in { from { opacity: 0; } }

/* Menu panel (portaled to body) */
.fc-filter-menu {
  display: none;
  position: fixed;
  z-index: 201;
  background: var(--surface);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.fc-filter-menu.open { display: block; }

/* Mobile/tablet: drawer from left */
.fc-filter-menu {
  top: 0;
  left: 0;
  width: 280px;
  height: 100vh;
  height: 100dvh;
  max-width: 80vw;
  border-right: 1px solid var(--border);
  animation: fc-drawer-in 0.2s ease;
}
@keyframes fc-drawer-in {
  from { transform: translateX(-100%); }
}

/* Header */
.fc-filter-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}
.fc-filter-menu-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}
.fc-filter-menu-close {
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  touch-action: manipulation;
}
.fc-filter-menu-close:active { opacity: 0.7; }

/* Filter list */
.fc-filter-list {
  padding: 8px 0;
}
.fc-filter-section-title {
  padding: 12px 18px 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}
.fc-filter-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 18px;
  border: none;
  background: none;
  color: var(--text);
  font-size: 0.88rem;
  cursor: pointer;
  touch-action: manipulation;
  transition: background var(--transition);
  text-align: left;
}
.fc-filter-item:active { background: var(--surface2); }
.fc-filter-item.active {
  color: var(--accent);
  font-weight: 700;
  background: rgba(56,189,248,.06);
}
.fc-filter-item-label { flex: 1; }
.fc-filter-item-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}
.fc-filter-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}
.fc-filter-item.active .fc-filter-dot {
  background: var(--accent);
}

/* ══════════════════════════════════════
   DESKTOP: dropdown instead of drawer
   ══════════════════════════════════════ */

/* Trigger wrapper (for desktop dropdown positioning) */
.fc-filter-trigger-wrap {
  position: relative;
  display: inline-flex;
}

@media (min-width: 768px) {
  .fc-filter-overlay {
    background: transparent;
    animation: none;
  }
  .fc-filter-menu {
    position: fixed;
    bottom: auto;
    height: auto;
    width: 260px;
    max-width: none;
    max-height: 400px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 8px 32px rgba(0,0,0,.2);
    animation: fc-dropdown-in 0.2s ease;
  }
  @keyframes fc-dropdown-in {
    from { opacity: 0; transform: translateY(-8px); }
  }
  .fc-filter-menu-header { display: none; }
}

/* ── Card ── */
.fc-card-container {
  width: 100%;
  margin-bottom: 8px;
  position: relative;
  -webkit-perspective: 1200px;
  perspective: 1200px;
  touch-action: none;
}
.fc-card {
  width: 100%;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  touch-action: none;
  position: relative;
}
.fc-card-container.dragging {
  position: relative;
  z-index: 200;
}
.fc-card-inner {
  position: relative;
  width: 100%;
  min-height: 280px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-transition: -webkit-transform 0.55s cubic-bezier(0.4,0,0.2,1);
  transition: transform 0.55s cubic-bezier(0.4,0,0.2,1);
  border-radius: var(--radius);
}
.fc-card.flipped .fc-card-inner {
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}
@media (hover: hover) {
  .fc-card { cursor: grab; }
  .fc-card:active { cursor: grabbing; }
}
.fc-card-front,
.fc-card-back {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  min-height: 280px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: var(--radius);
  padding: 48px 24px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  box-shadow: var(--shadow);
  overflow-y: auto;
}
.fc-card-front {
  background: var(--card-front);
  border: 1px solid var(--accent-border);
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
}
.fc-card-back {
  background: var(--card-back);
  border: 1px solid var(--accent-border);
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}

/* ── Swipe overlays (#3) ── */
.fc-swipe-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.05s linear;
  z-index: 5;
}
.fc-swipe-overlay.good {
  background: rgba(34,197,94,.2);
  border: 2px solid var(--good);
  color: var(--good);
  align-items: flex-end;
  padding-bottom: 20px;
}
.fc-swipe-overlay.bad {
  background: rgba(244,63,94,.2);
  border: 2px solid var(--bad);
  color: var(--bad);
  align-items: flex-end;
  padding-bottom: 20px;
}
.fc-swipe-overlay.skip {
  background: rgba(148,163,184,.15);
  border: 2px solid var(--text-muted);
  color: var(--text-muted);
  align-items: flex-end;
  padding-bottom: 20px;
}

/* ── Category tag ── */
.fc-category-tag {
  position: absolute;
  top: 14px; left: 14px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(56,189,248,.12);
  color: var(--accent);
  border: 1px solid var(--accent-border);
}

/* ── Card text ── */
.fc-question {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text);
  max-width: 600px;
  word-break: break-word;
}
.fc-answer {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  max-width: 600px;
  word-break: break-word;
}
.fc-answer strong { color: var(--accent); }


/* ══════════════════════════════════════
   END SCREEN (#7 + #8)
   ══════════════════════════════════════ */

.fc-end {
  touch-action: pan-y;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 32px 20px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--accent-border);
  box-shadow: var(--shadow);
  width: 100%;
}
.fc-end.hidden { display: none; }
.fc-end h2 { font-size: 1.4rem; }

/* Result bar */
.fc-end-stats-wrap { width: 100%; }
.fc-end-bar {
  width: 100%;
  height: 14px;
  background: var(--surface2);
  border-radius: 999px;
  overflow: hidden;
  display: flex;
  margin-bottom: 10px;
}
.fc-end-bar-fill {
  height: 100%;
  width: 0;
  background: var(--good);
  border-radius: 999px 0 0 999px;
  transition: width 0.8s cubic-bezier(0.4,0,0.2,1);
}
.fc-end-bar-bad {
  height: 100%;
  width: 0;
  background: var(--bad);
  border-radius: 0 999px 999px 0;
  transition: width 0.8s cubic-bezier(0.4,0,0.2,1) 0.1s;
}
.fc-end-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 600;
}
.fc-end-good { color: var(--good); }
.fc-end-pct { font-size: 1.1rem; font-weight: 700; color: var(--text); }
.fc-end-bad { color: var(--bad); }

/* Failed cards list */
.fc-end-failed {
  width: 100%;
  text-align: left;
}
.fc-end-failed-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--bad);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  text-align: center;
}
.fc-end-failed-card {
  background: var(--surface2);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 8px;
  border-left: 3px solid var(--bad);
}
.fc-end-failed-q {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.fc-end-failed-a {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.fc-end-failed-a strong { color: var(--accent); }

.fc-end-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}
.fc-end-actions button {
  min-height: 48px;
  padding: 12px 20px;
  border-radius: var(--radius);
  border: none;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  transition: opacity 0.2s;
}
.fc-end-actions button:active { opacity: 0.7; }
.fc-btn-restart { background: var(--accent); color: var(--on-accent); }
.fc-btn-retry   { background: var(--accent2); color: var(--on-accent); }
.fc-btn-reset   { background: var(--surface2); color: var(--text-secondary); border: 1px solid var(--border); }

/* ── Favorite button ── */
.fc-fav-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(0,0,0,0.2);
  color: var(--text-muted);
  font-size: 1.3rem;
  border-radius: 50%;
  cursor: pointer;
  touch-action: manipulation;
  transition: color var(--transition), background var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.fc-fav-btn.active { color: var(--fav); background: rgba(251,191,36,.15); }
.fc-fav-btn:active { opacity: 0.7; }

/* ── Special filters ── */
.fc-filter-special {
  border: 1px dashed var(--border);
}
.fc-deck-area.hidden { display: none; }
.fc-cardlist.hidden { display: none; }

/* ══════════════════════════════════════
   FOCUS MODE (#10)
   ══════════════════════════════════════ */

.fc-focus .chapter-header { display: none; }
.fc-focus .fc-stats-wrap { display: none; }

/* Focus mode: center card vertically */
.fc-focus .view {
  padding-bottom: 0;
}
.fc-focus .tab-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  cursor: pointer;
}
.fc-focus .fc-deck-area {
  width: 100%;
  position: relative;
}
.fc-focus .fc-progress-wrap { display: none; }
.fc-focus .fc-session-list-wrap { display: none; }

/* ── Shake feedback ── */
.fc-shake-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  pointer-events: none;
  padding: 24px 0;
  opacity: 0;
}
.fc-shake-overlay.visible {
  animation: shake-pop 600ms ease-out forwards;
}
.fc-shake-overlay svg {
  width: 32px;
  height: 32px;
  color: var(--accent);
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}
.fc-shake-overlay span {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

@keyframes shake-pop {
  0%   { opacity: 1; transform: scale(0.5); }
  30%  { opacity: 1; transform: scale(1.1); }
  50%  { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.3); }
}

.fc-card-container.shaking {
  animation: shake-wiggle 300ms ease-in-out;
}
@keyframes shake-wiggle {
  0%, 100% { transform: translateX(0); }
  15%      { transform: translateX(-6px); }
  30%      { transform: translateX(6px); }
  45%      { transform: translateX(-4px); }
  60%      { transform: translateX(4px); }
  75%      { transform: translateX(-2px); }
  90%      { transform: translateX(2px); }
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .fc-question { font-size: 1rem; }
  .fc-answer   { font-size: 0.9rem; }
  .fc-card-front, .fc-card-back { padding: 46px 18px 36px; min-height: 260px; }
  .fc-card-inner { min-height: 260px; }
  .fc-action-btn { font-size: 14px; min-height: 48px; }
}