/* TurtleEdu Filter Sidebar */
.filter-page-wrap{display:flex;gap:24px;max-width:1400px;margin:0 auto;padding:24px 5% 60px;align-items:flex-start}
.fsb{width:256px;min-width:256px;background:#fff;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden;position:sticky;top:82px;max-height:calc(100vh - 100px);overflow-y:auto;flex-shrink:0}
.fsb-head{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border-bottom:2px solid #e5e7eb}
.fsb-head>span{font-weight:800;font-size:0.82rem;letter-spacing:0.08em;color:#111827}
.fsb-clear-all{font-size:0.78rem;color:#2563eb;text-decoration:none;font-weight:700}
.fsb-clear-all:hover{text-decoration:underline}
.fsb-selected-wrap{padding:10px 14px 12px;border-bottom:1px solid #e5e7eb;background:#f8faff}
.fsb-sec-hd{font-weight:700;font-size:0.75rem;color:#374151;text-transform:uppercase;letter-spacing:.04em;margin-bottom:8px}
.fsb-chips{display:flex;flex-wrap:wrap;gap:5px}
.fsb-chip{background:#eff6ff;color:#1d4ed8;border:1px solid #bfdbfe;border-radius:20px;padding:3px 10px;font-size:0.73rem;font-weight:600;display:inline-flex;align-items:center;gap:4px;cursor:pointer;user-select:none}
.fsb-chip:hover{background:#dbeafe}
.fsb-chip-x{font-size:0.85rem;line-height:1;opacity:.7}
.fsb-group{border-bottom:1px solid #f3f4f6}
.fsb-group-hd{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;cursor:pointer;user-select:none;background:#fff}
.fsb-group-hd:hover{background:#f9fafb}
.fsb-group-hd>span:first-child{font-weight:700;font-size:0.82rem;color:#111827}
.fsb-chevron{font-size:0.72rem;color:#6b7280;transition:transform .2s;display:inline-block}
.fsb-group-body{padding:4px 14px 12px}
.fsb-search{width:100%;border:1px solid #e5e7eb;border-radius:8px;padding:7px 10px;font-size:0.78rem;margin-bottom:8px;outline:none;box-sizing:border-box}
.fsb-search:focus{border-color:#3b82f6;box-shadow:0 0 0 2px rgba(59,130,246,.15)}
.fsb-items{max-height:200px;overflow-y:auto}
.fsb-item{display:flex;align-items:center;gap:8px;padding:4px 2px;cursor:pointer}
.fsb-item input[type=checkbox]{width:15px;height:15px;accent-color:#2563eb;cursor:pointer;flex-shrink:0}
.fsb-item label{font-size:0.8rem;color:#374151;cursor:pointer;flex:1;line-height:1.3}
.fsb-count{font-size:0.73rem;color:#9ca3af;white-space:nowrap}
.fsb-content-wrap{flex:1;min-width:0}
@media(max-width:900px){
  .filter-page-wrap{flex-direction:column;padding:16px 4% 40px}
  .fsb{width:100%;min-width:unset;position:static;max-height:none}
}