/* Flashcards 字卡 — drop-in component (no dependencies)
   Namespaced .fc- | 3D flip animation | light paper palette */

.fc-shell {
  max-width: 900px;
  margin: 0 auto;
  font-family: var(--font-serif, "LXGW WenKai", Georgia, serif);
  color: var(--ink, #1F1B16);
}

/* ---- header ---- */
.fc-head { text-align: center; margin: 6px 0 22px; }
.fc-title {
  font-family: var(--font-serif); font-weight: 700; font-size: 1.5rem;
  letter-spacing: .04em; color: var(--ink, #1F1B16); margin: 0 0 6px;
}
.fc-meta {
  font-family: var(--font-sans); font-size: 12.5px; color: var(--ink-3, #6D6358);
  margin: 0; letter-spacing: .02em;
}

/* ---- card stage ---- */
.fc-stage { padding: 4px 0 0; }
.fc-card {
  position: relative;
  min-height: 470px;
  perspective: 1600px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.fc-inner {
  position: relative;
  width: 100%;
  min-height: 470px;
  transform-style: preserve-3d;
  transition: transform .62s cubic-bezier(.4, .15, .2, 1);
}
.fc-card.is-flipped .fc-inner { transform: rotateY(180deg); }

.fc-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: 22px 26px;
  background: var(--paper-2, #F4EEE3);
  border: 1px solid var(--border, #E0D7C8);
  border-radius: var(--radius, 12px);
  box-shadow: var(--shadow, 0 6px 24px rgba(31, 27, 22, .08));
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
}
.fc-face--back {
  transform: rotateY(180deg);
  background: #FFFDF8;
}

/* tag bar */
.fc-tagbar {
  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;
  font-family: var(--font-sans); font-size: 12.5px; letter-spacing: .04em;
  padding-bottom: 12px; margin-bottom: 16px;
  border-bottom: 1px dashed var(--border, #E0D7C8);
}
.fc-lesson {
  padding: 2px 9px; border-radius: 999px;
  background: var(--accent-pale, var(--cinnabar-pale, #F7E9E6));
  color: var(--accent, var(--cinnabar, #A83E2E));
  font-weight: 500;
}
.fc-topic { color: var(--ink-3, #6D6358); }
.fc-kind {
  margin-left: auto;
  padding: 2px 9px; border-radius: 999px;
  background: var(--paper-3, #E8E0D2); color: var(--ink-2, #4A4239);
}

/* body */
.fc-body { flex: 1; overflow-y: auto; display: flex; align-items: center; }
.fc-q {
  font-size: 1.8rem; line-height: 1.85; font-weight: 500;
  text-align: center; width: 100%;
}
.fc-a {
  font-size: 1.5rem; line-height: 1.95; text-align: left; width: 100%;
  color: var(--ink-2, #4A4239);
  border-left: 4px solid var(--accent, var(--cinnabar, #A83E2E));
  padding-left: 18px;
}
.fc-label {
  display: block;
  font-family: var(--font-sans); font-size: 12px; letter-spacing: .14em;
  color: var(--ink-3, #6D6358); margin-bottom: 8px; text-align: center;
}
.fc-face--back .fc-label { text-align: left; }

.fc-hint {
  font-family: var(--font-sans); font-size: 12.5px; color: var(--ink-3, #6D6358);
  text-align: center; padding-top: 14px; opacity: .8;
}

/* ---- controls ---- */
.fc-controls {
  display: flex; align-items: center; justify-content: center; gap: 18px;
  margin-top: 22px;
}
.fc-btn {
  font-family: var(--font-sans); font-size: 14px;
  padding: 9px 20px; border-radius: 999px; cursor: pointer;
  background: var(--paper-2, #F4EEE3);
  border: 1px solid var(--border, #E0D7C8);
  color: var(--ink-2, #4A4239);
  transition: background .18s, border-color .18s, transform .18s;
}
.fc-btn:hover {
  background: var(--accent-pale, var(--cinnabar-pale, #F7E9E6));
  border-color: var(--accent, var(--cinnabar, #A83E2E));
  color: var(--accent, var(--cinnabar, #A83E2E));
  transform: translateY(-1px);
}
.fc-count {
  font-family: var(--font-sans); font-size: 14px; color: var(--ink-3, #6D6358);
  min-width: 96px; text-align: center; letter-spacing: .04em;
}
.fc-count b { color: var(--accent, var(--cinnabar, #A83E2E)); font-size: 18px; }

/* ---- 模式篩選 / 未記熟標記 ---- */
.fc-modes {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  margin: 0 0 18px;
}
.fc-pill {
  font-family: var(--font-sans); font-size: 12.5px; line-height: 1;
  padding: 6px 14px; border-radius: 999px; cursor: pointer;
  background: var(--paper-2, #F4EEE3);
  border: 1px solid var(--border, #E0D7C8);
  color: var(--ink-3, #6D6358);
  transition: background .16s, border-color .16s, color .16s;
}
.fc-pill:hover { border-color: var(--accent, var(--cinnabar, #A83E2E)); }
.fc-pill .fc-n {
  display: inline-block; margin-left: 6px; padding: 1px 6px;
  border-radius: 999px; font-size: 10.5px;
  background: var(--paper-3, #E8E0D2); color: var(--ink-2, #4A4239);
}
.fc-pill.is-on {
  background: var(--accent, var(--cinnabar, #A83E2E));
  border-color: var(--accent, var(--cinnabar, #A83E2E));
  color: #fff;
}
.fc-pill.is-on .fc-n { background: rgba(255, 255, 255, .22); color: #fff; }

.fc-mark {
  font-size: 13px !important; padding: 9px 16px !important;
}
.fc-mark.is-on {
  background: var(--accent, var(--cinnabar, #A83E2E));
  border-color: var(--accent, var(--cinnabar, #A83E2E));
  color: #fff;
}
.fc-mark.is-on:hover {
  background: var(--accent, var(--cinnabar, #A83E2E));
  color: #fff; transform: none;
}

.fc-empty {
  text-align: center; padding: 30px 20px;
  font-family: var(--font-sans); font-size: 13.5px; line-height: 1.8;
  color: var(--ink-3, #6D6358);
  background: #FFFDF8;
  border: 1px dashed var(--border, #E0D7C8);
  border-radius: var(--border-radius-md, 8px);
}

@media (max-width: 640px) {
  .fc-card, .fc-inner { min-height: 500px; }
  .fc-face { padding: 18px 18px; }
  .fc-q { font-size: 1.5rem; }
  .fc-a { font-size: 1.28rem; }
  .fc-controls { gap: 10px; }
  .fc-btn { padding: 8px 14px; font-size: 12.5px; }
}