/* ── Flashcard Study View ── */
.fc-deck {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  padding: 12px 0 8px;
}

/* ── 3D flip container ── */
.fc-card-scene {
  width: 100%;
  max-width: 720px;
  height: 380px;
  perspective: 1200px;
  cursor: pointer;
}

.fc-card {
  width: 100%;
  height: 100%;
  border-radius: 22px;
  box-shadow: 0 4px 24px rgba(0,0,0,.10), 0 1px 4px rgba(0,0,0,.06);
  display: flex;
  flex-direction: column;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .55s cubic-bezier(.4,0,.2,1);
}

.fc-card.fc-flipped {
  transform: rotateY(180deg);
}

/* Front face */
.fc-card-front,
.fc-card-back {
  position: absolute;
  inset: 0;
  border-radius: 22px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.fc-card-front {
  background: #1c1814;
  border: 1px solid rgba(255,255,255,.07);
}

.fc-card-back {
  background: #faf8f5;
  border: 1px solid var(--border);
  transform: rotateY(180deg);
}

/* Header */
.fc-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.fc-card-num {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .07em;
}
.fc-card-num.dark  { color: rgba(255,255,255,.3); }
.fc-card-num.light { color: var(--text4); }

.fc-face-label {
  font-size: 9.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  font-weight: 700;
}
.fc-face-label.dark  { color: rgba(255,255,255,.25); }
.fc-face-label.light { color: var(--text4); }

/* Body */
.fc-card-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 48px;
  text-align: center;
}

.fc-q-text {
  font-size: 28px;
  line-height: 1.45;
  color: #ede6d4;
  font-weight: 500;
  font-family: 'Playfair Display', serif;
}

.fc-a-text {
  font-size: 22px;
  line-height: 1.6;
  color: #000;
  font-weight: 400;
  font-family: 'Playfair Display', serif;
  font-style: italic;
}

/* Footer */
.fc-card-footer {
  padding: 0 24px 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.fc-see-hint {
  font-size: 14px;
  color: rgba(255,255,255,.6);
  font-style: italic;
  letter-spacing: .02em;
  text-align: center;
}

.fc-explain-btn {
  padding: 10px 20px;
  border-radius: 18px;
  border: 1.5px solid var(--border-strong);
  background: transparent;
  color: var(--text3);
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all .15s;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.fc-explain-btn:hover  { border-color: var(--teal); color: var(--teal); background: var(--teal-dim); }
.fc-explain-btn:disabled { opacity: .4; cursor: default; }

/* Navigation row */
.fc-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
  width: 100%;
  max-width: 720px;
}

.fc-nav-btn {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  border: 1.5px solid var(--border-strong);
  background: var(--surface);
  color: var(--text2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all .18s;
  flex-shrink: 0;
  box-shadow: 0 1px 4px rgba(0,0,0,.07);
}
.fc-nav-btn:hover    { border-color: var(--gold); color: var(--gold); background: var(--gold-dim); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,.10); }
.fc-nav-btn:disabled { opacity: .3; cursor: default; transform: none; box-shadow: none; }

.fc-score-btn {
  width: 56px;
  height: 56px;
  border-radius: 15px;
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all .15s;
  flex-shrink: 0;
  background: transparent;
}
.fc-score-btn:hover   { transform: translateY(-1px); border-color: currentColor; }
.fc-score-btn:active  { transform: translateY(0); }
.fc-score-btn:disabled { cursor: default; opacity: .35; }

.fc-score-wrong { color: var(--danger); }
.fc-score-wrong:hover { border-color: var(--danger); background: var(--danger-dim); }
.fc-score-right { color: var(--teal); }
.fc-score-right:hover { border-color: var(--teal); background: var(--teal-dim); }

/* Keyboard hint */
.fc-kbd-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
  opacity: .45;
  transition: opacity .2s;
}
.fc-kbd-hint:hover { opacity: 1; }

.fc-kbd-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text4);
}
.fc-kbd-group span { color: var(--text3); font-size: 10.5px; }

.fc-kbd-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 7px;
  min-width: 24px;
  height: 22px;
  border-radius: 5px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.14);
  font-size: 10px;
  font-weight: 600;
  color: var(--text3);
  letter-spacing: .02em;
  box-shadow: 0 1px 0 rgba(0,0,0,.35);
  line-height: 1;
}

.fc-kbd-sep {
  width: 1px;
  height: 14px;
  background: var(--border-strong);
}

/* Progress bar */
.fc-progress-wrap {
  width: 100%;
  max-width: 720px;
  margin-top: 18px;
}
.fc-progress-bar {
  height: 3px;
  border-radius: 2px;
  background: var(--border-strong);
  overflow: hidden;
}
.fc-progress-fill {
  height: 100%;
  border-radius: 2px;
  background: var(--gold);
  transition: width .4s ease;
}
.fc-progress-stats {
  display: flex;
  justify-content: space-between;
  font-size: 10.5px;
  color: var(--text4);
  margin-top: 5px;
}

/* Explain panel */
.fc-explain-panel {
  width: 100%;
  max-width: 720px;
  margin-top: 14px;
  padding: 14px 18px;
  border-radius: 12px;
  background: var(--teal-dim);
  border: 1px solid color-mix(in srgb, var(--teal) 28%, transparent);
  font-size: 13px;
  color: var(--text2);
  line-height: 1.72;
  text-align: left;
  display: none;
}

/* Config screen — split layout */
.fc-config-layout {
  display: flex;
  gap: 20px;
  width: 100%;
  padding: 28px 24px 32px;
  align-items: flex-start;
  min-height: 500px;
}

.fc-config-main {
  flex: 1;
  min-width: 0;
}

.fc-config-box {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px 36px;
  box-shadow: var(--shadow-md);
}

.fc-config-sidebar {
  width: 260px;
  flex-shrink: 0;
}

.fc-config-sidebar-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text4);
  margin-bottom: 10px;
  padding-left: 2px;
}

.fc-config-deck-list {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

@media (max-width: 680px) {
  .fc-config-layout { flex-direction: column; padding: 20px 16px; }
  .fc-config-sidebar { width: 100%; }
}

.fc-config-eyebrow {
  font-size: 9.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
  margin-bottom: 6px;
}

.fc-config-title {
  font-family: 'Playfair Display', serif;
  font-size: 24px;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 4px;
}

.fc-config-sub {
  font-size: 12px;
  color: var(--text4);
  margin-bottom: 28px;
  line-height: 1.5;
}

.fc-config-label {
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 10px;
  display: block;
}

.fc-config-row { margin-bottom: 22px; }

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

.fc-opt {
  padding: 6px 16px;
  border-radius: 50px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text3);
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all .15s;
  line-height: 1.4;
}
.fc-opt:hover { border-color: var(--gold); color: var(--gold); }
.fc-opt.on    { background: var(--btn-bg); border-color: var(--btn-bg); color: var(--btn-text); }

.fc-config-input {
  width: 100%;
  padding: 9px 13px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: var(--bg2);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
}
.fc-config-input:focus       { border-color: var(--gold); }
.fc-config-input::placeholder { color: var(--text4); }

.fc-custom-count {
  display: none;
  width: 90px;
  padding: 6px 11px;
  border-radius: 9px;
  border: 1px solid var(--gold);
  background: var(--bg2);
  color: var(--text);
  font-size: 12px;
  font-family: inherit;
  outline: none;
}

.fc-config-generate {
  width: 100%;
  margin-top: 28px;
  padding: 14px;
  border-radius: 12px;
  border: none;
  background: var(--btn-bg);
  color: var(--btn-text);
  font-size: 14px;
  font-weight: 700;
  font-family: 'Lato', sans-serif;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: opacity .15s, transform .12s;
  letter-spacing: .01em;
}
.fc-config-generate:hover:not(:disabled) { opacity: .88; transform: translateY(-1px); }
.fc-config-generate:active  { transform: translateY(0); }
.fc-config-generate:disabled { opacity: .4; cursor: default; }

/* Skeleton loader */
.fc-skeleton {
  width: 100%;
  max-width: 720px;
  border-radius: 22px;
  min-height: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 40px;
}
.fc-skeleton-line {
  height: 14px;
  border-radius: 7px;
  background: var(--border-strong);
  animation: fcSkeletonPulse 1.4s ease-in-out infinite;
}
@keyframes fcSkeletonPulse { 0%,100%{opacity:.4} 50%{opacity:1} }

/* Deck history shelf (study screen) */
.fc-decks-shelf { width: 100%; max-width: 720px; margin-top: 28px; }
.fc-decks-shelf-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.fc-decks-shelf-title  { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--text4); }
.fc-decks-grid         { display: flex; flex-direction: column; gap: 8px; }

.fc-deck-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 11px;
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all .15s;
  text-align: left;
}
.fc-deck-item:hover  { border-color: var(--gold); background: var(--gold-dim); }
.fc-deck-item.active { border-color: var(--gold); background: var(--gold-dim); }

.fc-deck-item-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--gold-dim);
  border: 1px solid color-mix(in srgb, var(--gold) 30%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--gold);
}

.fc-deck-item-info   { flex: 1; overflow: hidden; }
.fc-deck-item-title  { font-size: 13px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-bottom: 2px; }
.fc-deck-item-meta   { font-size: 11px; color: var(--text4); }
.fc-deck-item-actions { display: flex; gap: 6px; flex-shrink: 0; }

.fc-deck-action-btn {
  padding: 4px 10px;
  border-radius: 7px;
  border: 1px solid var(--border-strong);
  background: transparent;
  font-size: 11px;
  font-family: inherit;
  color: var(--text3);
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
}
.fc-deck-action-btn:hover         { border-color: var(--teal); color: var(--teal); }
.fc-deck-action-btn.saved         { border-color: color-mix(in srgb,var(--teal) 40%,transparent); color: var(--teal); background: var(--teal-dim); cursor: default; }

/* Difficulty labels */
.fc-diff-easy   { color: var(--teal); }
.fc-diff-medium { color: var(--gold); }
.fc-diff-hard   { color: var(--danger); }

@keyframes fcCardIn { from{opacity:0;transform:translateY(10px)} to{opacity:1;transform:none} }

/* ── Mode tabs ── */
.fc-mode-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 4px;
  margin-bottom: 22px;
  width: fit-content;
}
.fc-mode-tab {
  padding: 7px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text3);
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all .18s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.fc-mode-tab:hover { color: var(--text2); }
.fc-mode-tab.on {
  background: var(--surface);
  color: var(--gold);
  border: 1px solid var(--border-strong);
  box-shadow: 0 2px 6px rgba(0,0,0,.10);
}

/* ── Topic suggestion chips ── */
.fc-topic-chip {
  padding: 4px 11px;
  border-radius: 50px;
  border: 1px dashed var(--border-strong);
  background: transparent;
  color: var(--text4);
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  transition: all .15s;
}
.fc-topic-chip:hover { border-color: var(--teal); color: var(--teal); border-style: solid; }

/* ── Depth buttons ── */
.fc-depth-row { display: flex; gap: 8px; }
.fc-depth-btn {
  flex: 1;
  padding: 10px 8px;
  border-radius: 9px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text3);
  font-size: 11px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all .15s;
  text-align: center;
  line-height: 1.4;
}
.fc-depth-label { font-weight: 700; font-size: 11.5px; display: block; margin-bottom: 2px; }
.fc-depth-sub   { font-size: 10px; color: var(--text4); }
.fc-depth-btn:hover { border-color: var(--gold); color: var(--gold); }
.fc-depth-btn.on { border-color: var(--gold); background: var(--gold-dim); color: var(--gold); }
.fc-depth-btn.on .fc-depth-sub { color: var(--gold); opacity: .7; }

/* ── Chat UI ── */
.fc-chat-wrap {
  margin-top: 12px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.fc-chat-messages {
  max-height: 280px;
  overflow-y: auto;
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px 0;
}

.fc-chat-msg {
  font-size: 12px;
  line-height: 1.5;
  padding: 10px 12px;
  border-radius: 8px;
  max-width: 85%;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.fc-chat-msg-ai {
  align-self: flex-start;
  background: var(--teal-dim);
  color: var(--teal);
}

.fc-chat-msg-user {
  align-self: flex-end;
  background: var(--gold-dim);
  color: var(--gold);
}

.fc-chat-msg-error {
  align-self: flex-start;
  background: rgba(239,68,68,.08);
  color: var(--danger);
}

@keyframes fcChatDot {
  0%, 60%, 100% { opacity: 0.3; }
  30% { opacity: 1; }
}

.fc-chat-loading {
  display: flex;
  gap: 4px;
  align-items: center;
  align-self: flex-start;
  padding: 10px 12px;
}

.fc-chat-loading span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  animation: fcChatDot 1.4s infinite;
}

.fc-chat-loading span:nth-child(2) { animation-delay: 0.2s; }
.fc-chat-loading span:nth-child(3) { animation-delay: 0.4s; }

.fc-chat-input-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.fc-chat-input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  font-size: 12px;
  font-family: inherit;
  transition: border-color .15s;
}

.fc-chat-input:focus {
  outline: none;
  border-color: var(--teal);
}

.fc-chat-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.fc-chat-send-btn {
  padding: 10px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .15s;
  font-family: inherit;
}

.fc-chat-send-btn:hover:not(:disabled) {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
}

.fc-chat-send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.fc-chat-limit-notice {
  font-size: 11px;
  color: var(--text4);
  text-align: center;
  padding: 8px;
  margin-top: 4px;
  border-top: 1px solid var(--border);
}