.inv-layout{display:grid;grid-template-columns:420px 1fr;gap:24px;align-items:start}
.inv-form .box{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;margin-bottom:14px}
.inv-form h3,.inv-form summary{margin:0 0 10px;font-size:15px;color:var(--gold2);cursor:pointer}
.inv-form label{display:block;font-size:12px;color:var(--mute);margin-bottom:8px}
.inv-form input,.inv-form textarea{width:100%;font-family:inherit;font-size:14px;background:#fff;border:1px solid var(--line);color:var(--txt);border-radius:8px;padding:7px 9px;margin-top:3px}
.inv-form input:focus,.inv-form textarea:focus{outline:0;border-color:var(--gold)}
.g2{display:grid;grid-template-columns:1fr 1fr;gap:0 10px}
.g3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:0 10px}
.hint{font-size:12px;color:var(--gold2);margin:0}
.item{border:1px dashed var(--line);border-radius:10px;padding:10px;margin-bottom:10px;position:relative}
.item .g4{display:grid;grid-template-columns:1fr 1fr 1fr 1.4fr;gap:0 8px}
.item .del{position:absolute;top:6px;left:8px;background:none;border:0;color:#c55;cursor:pointer;font-size:15px}
.item .amt{font-size:12px;color:var(--gold2)}
.inv-side{position:sticky;top:90px}
.inv-actions{display:flex;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.inv-scroll{background:var(--ink);border:1px solid var(--line);border-radius:var(--r);padding:16px;overflow:auto}
#paper{background:#fff;color:#000;margin:auto;box-shadow:0 4px 18px #0002}

/* فاکتور: فضای ۷۶۰ واحدی مثل نرم افزار */
.fk{position:relative;width:760px;font-family:Vazirmatn,Tahoma,sans-serif;font-weight:700;color:#000;direction:rtl;transform-origin:top right}
.fk>*{position:absolute;box-sizing:border-box;margin:0;line-height:1;white-space:nowrap;overflow:hidden;display:flex;align-items:center;justify-content:center}
.fk .r{justify-content:flex-start;padding:0 3px}
.fk .bd{border:1px solid #000}
.fk .bt{border:1.6px solid #000}
.fk .gr{background:#d9d9d9}
.fk img{display:block;object-fit:contain}
.fk .wm{inset:auto;color:#0000000b;font-size:64px;transform:rotate(-18deg);pointer-events:none}
.fk .brandline{justify-content:center;font-size:10px;color:#444;border-top:1px dashed #999}

@media(max-width:1100px){.inv-layout{grid-template-columns:1fr}.inv-side{position:static}}
@media(max-width:560px){.g3{grid-template-columns:1fr 1fr}.item .g4{grid-template-columns:1fr 1fr}}

@media print{
  @page{size:A5 landscape;margin:8mm}
  body{background:#fff}
  body *{visibility:hidden}
  #paper,#paper *{visibility:visible}
  #paper{position:absolute;top:0;right:0;box-shadow:none;width:auto!important;height:auto!important}
  .site-head,.site-foot{display:none}
}