/* === Four-category task type system === */

.fk-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 9999px;
  line-height: 1.4;
  white-space: nowrap;
  vertical-align: middle;
  margin-left: 6px;
}
.fk-badge-mandatory {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}
.fk-badge-optional {
  background: #eff6ff;
  color: #2563eb;
  border: 1px solid #bfdbfe;
}
.fk-badge-experiment {
  background: #f0fdf4;
  color: #16a34a;
  border: 1px solid #bbf7d0;
}
.fk-badge-free {
  background: #faf5ff;
  color: #9333ea;
  border: 1px solid #e9d5ff;
}

/* Teacher assignment tip card on lesson detail */
.fk-teacher-tip {
  background: linear-gradient(135deg, #fef2f2, #fff1f2);
  border: 1px solid #fecaca;
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: #991b1b;
}
.fk-teacher-tip-icon {
  font-size: 18px;
  flex-shrink: 0;
}
.fk-teacher-tip-text strong {
  font-weight: 700;
}

/* Project folder group */
.fk-folder-group {
  margin-bottom: 4px;
}
.fk-folder-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  text-align: left;
  padding: 8px 4px;
  border-radius: 8px;
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  transition: background 0.15s;
}
.fk-folder-btn:hover {
  background: #f9fafb;
}
.fk-folder-chevron {
  width: 16px;
  height: 16px;
  color: #9ca3af;
  transition: transform 0.2s;
  flex-shrink: 0;
}
.fk-folder-chevron.collapsed {
  transform: rotate(-90deg);
}
.fk-folder-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.fk-folder-label {
  font-size: 14px;
  font-weight: 600;
  color: #374151;
}
.fk-folder-count {
  font-size: 12px;
  color: #9ca3af;
  background: #f9fafb;
  padding: 1px 8px;
  border-radius: 9999px;
}
.fk-folder-content {
  padding-left: 24px;
  margin-top: 4px;
  overflow: hidden;
  transition: max-height 0.25s ease;
}
.fk-folder-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 768px) {
  .fk-folder-grid {
    grid-template-columns: 1fr;
  }
}
.fk-folder-empty {
  font-size: 13px;
  color: #9ca3af;
  padding: 8px 0;
}

/* Stats sub-info */
.fk-stats-sub {
  font-size: 11px;
  color: #9ca3af;
  margin-top: 2px;
}