/* ── Shared layout ───────────────────────────────────────────── */
.fca-section { background: var(--bg); padding-top: 90px; }

.fca-back       { margin-bottom: 10px; }
.fca-back-link  { font-size: 14px; font-weight: 700; color: var(--teal); text-decoration: none; }
.fca-back-link:hover { text-decoration: underline; }

/* ── Page header ─────────────────────────────────────────────── */
.fca-header { text-align: center; margin-bottom: 20px; }
.fca-grade-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 12px;
}
.fca-badge-icon {
  font-size: 28px;
  line-height: 1;
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
}
.fca-badge-icon.grade4 { background: rgba(0,151,167,0.12); }
.fca-badge-icon.grade5 { background: rgba(124,58,237,0.12); }
.fca-badge-icon.grade6 { background: rgba(245,158,11,0.12); }
.fca-badge-icon.grade7 { background: rgba(220,38,38,0.12);  }
.fca-badge-icon.grade8 { background: rgba(21,101,192,0.12); }

.fca-title {
  font-family: 'Baloo 2', cursive;
  font-weight: 800;
  font-size: clamp(20px, 3vw, 28px);
  color: var(--navy);
  margin-bottom: 4px;
}
.fca-subtitle {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Status messages ─────────────────────────────────────────── */
.fca-status {
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--muted);
  padding: 40px 0;
}
.fca-status--error { color: #dc2626; }

/* ── Grade grid ──────────────────────────────────────────────── */
.fca-grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.fca-grade-card {
  background: #fff;
  border-radius: 24px;
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
  border: 2px solid transparent;
  box-shadow: 0 6px 24px rgba(0,80,140,0.08);
  cursor: pointer;
  transition: transform 0.22s, box-shadow 0.22s, border-color 0.22s;
  position: relative;
  overflow: hidden;
}
.fca-grade-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  border-radius: 24px 24px 0 0;
}
.fca-grade-card.grade4::before { background: linear-gradient(90deg, #0097a7, #1565c0); }
.fca-grade-card.grade5::before { background: linear-gradient(90deg, #7c3aed, #a855f7); }
.fca-grade-card.grade6::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.fca-grade-card.grade7::before { background: linear-gradient(90deg, #dc2626, #f87171); }
.fca-grade-card.grade8::before { background: linear-gradient(90deg, #1565c0, #3b82f6); }

.fca-grade-card.grade4:hover { border-color: #67e8f9; transform: translateY(-6px); box-shadow: 0 18px 44px rgba(0,151,167,0.15); }
.fca-grade-card.grade5:hover { border-color: #c4b5fd; transform: translateY(-6px); box-shadow: 0 18px 44px rgba(124,58,237,0.15); }
.fca-grade-card.grade6:hover { border-color: #fcd34d; transform: translateY(-6px); box-shadow: 0 18px 44px rgba(245,158,11,0.15); }
.fca-grade-card.grade7:hover { border-color: #fca5a5; transform: translateY(-6px); box-shadow: 0 18px 44px rgba(220,38,38,0.15); }
.fca-grade-card.grade8:hover { border-color: #93c5fd; transform: translateY(-6px); box-shadow: 0 18px 44px rgba(21,101,192,0.15); }

.fca-grade-icon {
  font-size: 42px;
  line-height: 1;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.fca-grade-name {
  font-family: 'Baloo 2', cursive;
  font-weight: 800;
  font-size: 18px;
  color: var(--navy);
}
.fca-grade-desc {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  line-height: 1.65;
  flex: 1;
}
.fca-grade-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  font-weight: 800;
  color: #fff;
  padding: 10px 24px;
  border-radius: 50px;
  margin-top: 4px;
  transition: transform 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}
.fca-grade-card:hover .fca-grade-btn {
  transform: translateY(-2px);
}

/* ── Deck grid ───────────────────────────────────────────────── */
.fca-deck-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 760px;
  margin: 0 auto;
}

.fca-deck-card {
  background: #fff;
  border-radius: 18px;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  border: 2px solid transparent;
  box-shadow: 0 4px 18px rgba(0,80,140,0.07);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.fca-deck-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0,80,140,0.12);
}
.fca-deck-card.grade4:hover { border-color: #67e8f9; }
.fca-deck-card.grade5:hover { border-color: #c4b5fd; }
.fca-deck-card.grade6:hover { border-color: #fcd34d; }
.fca-deck-card.grade7:hover { border-color: #fca5a5; }
.fca-deck-card.grade8:hover { border-color: #93c5fd; }

.fca-deck-num {
  font-family: 'Baloo 2', cursive;
  font-weight: 800;
  font-size: 22px;
  color: var(--muted);
  min-width: 36px;
  text-align: center;
}
.fca-deck-info { flex: 1; min-width: 0; }
.fca-deck-name {
  font-family: 'Baloo 2', cursive;
  font-weight: 800;
  font-size: 17px;
  color: var(--navy);
  margin-bottom: 2px;
}
.fca-deck-desc {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  line-height: 1.55;
}
.fca-deck-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  flex-shrink: 0;
}
.fca-deck-count {
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}
.fca-deck-btn {
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  font-weight: 800;
  color: #fff;
  border: none;
  padding: 9px 20px;
  border-radius: 50px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s, box-shadow 0.2s;
}
.fca-deck-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.18);
}

/* ── Two-panel layout ────────────────────────────────────────── */
.fca-panel {
  display: flex;
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
  align-items: flex-start;
}

/* ── Left: category buttons ──────────────────────────────────── */
.fca-cat-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
  width: 150px;
}

.fca-cat-btn {
  width: 100%;
  padding: 10px 16px;
  background: #fff;
  border: 2px solid #e2e8f0;
  border-radius: 10px;
  font-family: 'Baloo 2', cursive;
  font-weight: 800;
  font-size: 14px;
  color: var(--navy);
  cursor: pointer;
  text-align: left;
  transition: background 0.16s, border-color 0.16s, color 0.16s;
  box-shadow: 0 1px 6px rgba(0,80,140,0.06);
}
.fca-cat-btn:hover {
  background: #f0f9ff;
  border-color: #67e8f9;
  color: #0097a7;
}
.fca-cat-btn--active {
  background: #0097a7;
  border-color: #0097a7;
  color: #fff;
  box-shadow: 0 4px 14px rgba(0,151,167,0.3);
}
.fca-cat-btn--active:hover {
  background: #0097a7;
  border-color: #0097a7;
  color: #fff;
}

/* ── Right: deck list ────────────────────────────────────────── */
.fca-deck-col {
  flex: 1;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,80,140,0.06);
}

.fca-deck-row {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: none;
  border: none;
  border-bottom: 1px solid #f1f5f9;
  cursor: pointer;
  text-align: left;
  transition: background 0.14s;
}
.fca-deck-row:last-child { border-bottom: none; }
.fca-deck-row:hover { background: #f0f9ff; }
.fca-deck-row:hover .fca-deck-row-name { color: #0097a7; }

.fca-deck-row-num {
  font-family: 'Baloo 2', cursive;
  font-weight: 700;
  font-size: 13px;
  color: var(--muted);
  min-width: 20px;
  text-align: center;
}
.fca-deck-row-name {
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: var(--navy);
  flex: 1;
  transition: color 0.14s;
}
.fca-deck-row-count {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  white-space: nowrap;
}
.fca-deck-row-arrow {
  font-size: 13px;
  font-weight: 700;
  color: #0097a7;
  flex-shrink: 0;
}

@media (max-width: 520px) {
  .fca-panel     { flex-direction: column; }
  .fca-cat-col   { width: 100%; flex-direction: row; flex-wrap: wrap; }
  .fca-cat-btn   { width: auto; }
  .fca-deck-col  { width: 100%; }
}

@media (max-width: 640px) {
  .fca-grade-grid { grid-template-columns: 1fr 1fr; }
  .fca-deck-card  { flex-wrap: wrap; gap: 14px; }
  .fca-deck-meta  { flex-direction: row; align-items: center; width: 100%; justify-content: space-between; }
  .fca-deck-row-count { display: none; }
}

@media (max-width: 420px) {
  .fca-grade-grid { grid-template-columns: 1fr; }
}