/* 闪卡页样式。整页 splash 布局，卡片居中，手机上也能用。 */

main {
  --sl-content-width: 46rem;
}

#fc-root {
  padding: 1rem 0 4rem;
}

/* ── 顶部导航 ──────────────────────────────────────────── */
.fc-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  margin: 0.4rem 0 1.2rem;
}

.fc-nav a {
  color: var(--sl-color-gray-2, #4b5563);
  text-decoration: none;
}

.fc-nav a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── 统计条 ────────────────────────────────────────────── */
.fc-stats {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.fc-pill {
  border: 1px solid var(--sl-color-gray-5, #e5e7eb);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  font-size: 0.82rem;
  color: var(--sl-color-gray-2, #4b5563);
}

.fc-spacer {
  margin-left: auto;
}

/* ── 卡片 ──────────────────────────────────────────────── */
.fc-card {
  border: 1px solid var(--sl-color-gray-5, #e5e7eb);
  border-radius: 12px;
  padding: 1.4rem 1.5rem 1.2rem;
  background: var(--sl-color-bg-nav, #fff);
}

.fc-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.fc-tag {
  background: var(--sl-color-accent-low, #e8f0ff);
  color: var(--sl-color-accent-high, #1a4d8f);
  border-radius: 999px;
  padding: 0.1rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.fc-progress {
  color: var(--sl-color-gray-3, #6b7280);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.fc-front {
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 0.6rem;
}

.fc-back {
  border-top: 1px dashed var(--sl-color-gray-5, #e5e7eb);
  margin-top: 0.8rem;
  padding-top: 0.9rem;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--sl-color-white, #111);
}

/* ── 按钮 ──────────────────────────────────────────────── */
.fc-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--sl-color-gray-4, #d1d5db);
  background: var(--sl-color-bg, #fff);
  color: inherit;
  border-radius: 8px;
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.fc-btn:hover {
  background: var(--sl-color-gray-6, #f3f4f6);
}

.fc-btn-primary {
  background: var(--sl-color-accent, #2563eb);
  border-color: var(--sl-color-accent, #2563eb);
  color: #fff;
  font-weight: 600;
}

.fc-btn-primary:hover {
  filter: brightness(1.08);
  background: var(--sl-color-accent, #2563eb);
}

.fc-btn-ghost {
  border-style: dashed;
  color: var(--sl-color-gray-2, #4b5563);
}

.fc-select {
  border: 1px dashed var(--sl-color-gray-4, #d1d5db);
  border-radius: 6px;
  background: var(--sl-color-bg, #fff);
  color: var(--sl-color-gray-2, #4b5563);
  font-size: 0.85rem;
  padding: 0.3rem 0.5rem;
}

.fc-btn-ghost.fc-on {
  border-style: solid;
  border-color: var(--sl-color-accent, #2563eb);
  color: var(--sl-color-accent, #2563eb);
  font-weight: 600;
}

.fc-kbd {
  border: 1px solid currentColor;
  border-radius: 4px;
  padding: 0 0.28rem;
  font-size: 0.66rem;
  opacity: 0.65;
  line-height: 1.5;
}

/* ── 四档评价 ───────────────────────────────────────────── */
.fc-grades {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.1rem;
}

.fc-grades .fc-btn {
  flex: 1 1 6rem;
  justify-content: center;
  font-weight: 600;
}

.fc-g0 {
  border-color: #e5b4b4;
  color: #a13b3b;
  background: #fdf2f2;
}

.fc-g3 {
  border-color: #e8cfa0;
  color: #8a6318;
  background: #fdf8ec;
}

.fc-g4 {
  border-color: #b6cfe8;
  color: #2b5c8a;
  background: #f2f7fd;
}

.fc-g5 {
  border-color: #b3ddc2;
  color: #256b45;
  background: #f1faf4;
}

.fc-g0:hover,
.fc-g3:hover,
.fc-g4:hover,
.fc-g5:hover {
  filter: brightness(0.97);
  background: inherit;
}

/* ── 说明文字与完成态 ─────────────────────────────────── */
.fc-note {
  color: var(--sl-color-gray-3, #6b7280);
  font-size: 0.82rem;
  line-height: 1.7;
  margin: 0.8rem 0 0;
}

.fc-empty {
  text-align: center;
  padding: 2.5rem 1.5rem;
}

.fc-done {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
}

.fc-empty .fc-btn {
  margin-top: 1.2rem;
}

@media (max-width: 480px) {
  .fc-front {
    font-size: 1.15rem;
  }
  .fc-card {
    padding: 1.1rem 1rem 1rem;
  }
}