.gsf{--gsf-red:#ec0000;--gsf-ink:#222;--gsf-muted:#777;--gsf-line:#e6e6e6;--gsf-soft:#f6f6f6;position:relative;margin:0 0 14px;font-size:14px;color:var(--gsf-ink)}
.gsf *{box-sizing:border-box}

/* bar */
.gsf-bar{display:flex;align-items:center;gap:18px;padding:10px 12px;background:#fff;border:1px solid var(--gsf-line);border-radius:6px}
.gsf-open{display:inline-flex;align-items:center;gap:7px;height:36px;padding:0 14px;border:1px solid var(--gsf-red);border-radius:4px;background:#fff;color:var(--gsf-red);font-weight:700;font-size:14px;cursor:pointer;flex-shrink:0;transition:background .15s,color .15s}
.gsf-open svg{width:15px;height:15px;fill:currentColor}
.gsf-open:hover,.gsf-open[aria-expanded="true"]{background:var(--gsf-red);color:#fff}
.gsf-badge{min-width:19px;height:19px;padding:0 5px;border-radius:10px;background:var(--gsf-red);color:#fff;font-size:11px;line-height:19px;text-align:center}
.gsf-open:hover .gsf-badge,.gsf-open[aria-expanded="true"] .gsf-badge{background:#fff;color:var(--gsf-red)}

.gsf-sort{display:flex;align-items:center;flex-wrap:wrap;gap:6px 18px;min-width:0}
.gsf-sort-lbl{font-weight:700}
.gsf-radio{display:inline-flex;align-items:center;gap:7px;color:var(--gsf-ink);text-decoration:none;white-space:nowrap}
.gsf-radio i{width:16px;height:16px;border:1px solid #bbb;border-radius:50%;flex-shrink:0;transition:border-color .15s,box-shadow .15s}
.gsf-radio:hover{color:var(--gsf-red);text-decoration:none}
.gsf-radio:hover i{border-color:var(--gsf-red)}
.gsf-radio.on{color:var(--gsf-red);font-weight:600}
.gsf-radio.on i{border-color:var(--gsf-red);box-shadow:inset 0 0 0 4px #fff,inset 0 0 0 8px var(--gsf-red)}
.gsf-sort-m{display:none;margin:0}
.gsf-sort-m select{height:36px;padding:0 30px 0 10px;border:1px solid var(--gsf-line);border-radius:4px;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23555' stroke-width='1.6'/%3E%3C/svg%3E") no-repeat right 10px center/11px;font-size:14px;color:var(--gsf-ink);-webkit-appearance:none;appearance:none}
.gsf-total{margin-left:auto;color:var(--gsf-muted);white-space:nowrap}
.gsf-total b{color:var(--gsf-ink)}

/* active chips */
.gsf-chips{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:10px 12px 0}
.gsf-chips-lbl{color:var(--gsf-muted)}
.gsf-chip{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 10px;border:1px solid #f3c2c2;border-radius:15px;background:#fff5f5;color:var(--gsf-red);font-size:13px;text-decoration:none}
.gsf-chip span{font-size:16px;line-height:1}
.gsf-chip:hover{background:var(--gsf-red);border-color:var(--gsf-red);color:#fff;text-decoration:none}
.gsf-clear{color:var(--gsf-muted);font-size:13px;text-decoration:underline}
.gsf-clear:hover{color:var(--gsf-red)}

/* panel: dropdown on desktop */
.gsf-panel{position:absolute;left:0;right:0;top:calc(100% + 6px);z-index:60;background:#fff;border:1px solid var(--gsf-line);border-radius:6px;box-shadow:0 12px 32px rgba(0,0,0,.12)}
.gsf-panel[hidden],.gsf-backdrop[hidden]{display:none}
.gsf-panel-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--gsf-line)}
.gsf-panel-head strong{font-size:15px;text-transform:uppercase}
.gsf-close{width:32px;height:32px;border:0;border-radius:50%;background:var(--gsf-soft);font-size:22px;line-height:1;color:var(--gsf-ink);cursor:pointer}
.gsf-close:hover{background:var(--gsf-red);color:#fff}
.gsf-panel-body{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:4px 28px;padding:8px 16px 4px;max-height:60vh;overflow:auto}
.gsf-group{margin:0;padding:10px 0;border:0;min-width:0}
.gsf-group legend{margin:0 0 8px;padding:0;font-size:13px;font-weight:700;text-transform:uppercase;color:var(--gsf-ink);width:auto}
.gsf-opts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 12px}
.gsf-check{display:flex;align-items:center;gap:8px;margin:0;padding:5px 0;cursor:pointer;line-height:1.3}
.gsf-check input{position:absolute;opacity:0;pointer-events:none}
.gsf-check i{width:17px;height:17px;border:1px solid #bbb;border-radius:3px;flex-shrink:0;background:#fff;transition:.15s}
.gsf-check input:checked+i{background:var(--gsf-red) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 10'%3E%3Cpath d='M1 5l3.5 3.5L11 1.5' fill='none' stroke='%23fff' stroke-width='2'/%3E%3C/svg%3E") no-repeat center/11px;border-color:var(--gsf-red)}
.gsf-check input:focus-visible+i{outline:2px solid var(--gsf-red);outline-offset:2px}
.gsf-check:hover i{border-color:var(--gsf-red)}
.gsf-check em{font-style:normal;color:var(--gsf-muted);font-size:13px}
.gsf-check.off{opacity:.4;cursor:not-allowed}
.gsf-panel-foot{display:flex;align-items:center;justify-content:flex-end;gap:16px;padding:12px 16px;border-top:1px solid var(--gsf-line)}
.gsf-reset{color:var(--gsf-muted);text-decoration:underline}
.gsf-reset:hover{color:var(--gsf-red)}
.gsf-apply{min-width:170px;height:40px;padding:0 20px;border:0;border-radius:4px;background:var(--gsf-red);color:#fff;font-weight:700;font-size:14px;cursor:pointer}
.gsf-apply:hover{background:#c40000}
.gsf-apply:disabled{background:#ccc;cursor:not-allowed}
.gsf-backdrop{position:fixed;inset:0;z-index:2147483000;background:rgba(0,0,0,.45)}

/* mobile: compact bar + bottom sheet */
@media (max-width:767px){
  .gsf-bar{gap:10px;padding:8px}
  .gsf-sort{display:none}
  .gsf-sort-m{display:block;flex:1;min-width:0}
  .gsf-sort-m select{width:100%}
  .gsf-total{display:none}
  .gsf-open{flex:1;justify-content:center}
  .gsf-panel{position:fixed;left:0;right:0;top:auto;bottom:0;z-index:2147483001;max-height:85vh;display:flex;flex-direction:column;border-radius:14px 14px 0 0;border:0}
  .gsf-panel[hidden]{display:none}
  .gsf-panel-body{display:block;max-height:none;flex:1;overflow:auto;padding:0 16px}
  .gsf-group{border-bottom:1px solid var(--gsf-line)}
  .gsf-group:last-child{border-bottom:0}
  .gsf-panel-foot{padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px))}
  .gsf-apply{flex:1}
  body.gsf-lock{overflow:hidden}
}