.inv-wrap{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,"Helvetica Neue",Arial,"Noto Sans";max-width:1100px;margin:0 auto;padding:20px}
.inv-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:1024px){.inv-grid{grid-template-columns:1fr}}
.inv-card{background:#fff;border:1px solid #e5e7eb;border-radius:14px;box-shadow:0 2px 10px rgba(0,0,0,.04);padding:18px}
h2{margin:.2rem 0 1rem}
h3{margin:1rem 0 .4rem}
.inv-form label{display:block;font-size:14px;color:#334155;font-weight:600;margin-bottom:8px}
.inv-form input, .inv-form textarea, .inv-form select{width:100%;box-sizing:border-box;border:1px solid #d1d5db;border-radius:10px;padding:10px 12px;font-size:14px;background:#fff}
.inv-form textarea{min-height:74px;white-space:pre}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
@media (max-width:720px){.row2,.row3{grid-template-columns:1fr}}
.tbl{width:100%;border-collapse:separate;border-spacing:0;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden}
.tbl th,.tbl td{padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:14px}
.tbl thead th{background:#f1f5f9;text-align:left}
.tbl tfoot td{font-weight:800}
.actions{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap}
.btn{background:#334155;color:#fff;border:none;padding:10px 14px;border-radius:10px;font-weight:700;cursor:pointer}
.btn.primary{background:#16a34a}
.btn:disabled{opacity:.6;cursor:not-allowed}

.preview{border:1px dashed #cbd5e1;border-radius:12px;min-height:300px;padding:12px;background:#f8fafc}
.placeholder{color:#64748b}

.print-area{display:none}

/* A4 šablona (pro náhled i export) */
.a4{width:210mm;min-height:297mm;box-sizing:border-box;padding:18mm;margin:0 auto;background:#fff;color:#0f172a;font-size:12pt;line-height:1.35}
.a4 h1{font-size:20pt;margin:0 0 10pt}
.muted{color:#475569}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:10pt}
.box{border:1px solid #cbd5e1;border-radius:8pt;padding:8pt}
table{width:100%;border-collapse:collapse;margin-top:10pt}
th,td{border-bottom:1px solid #e2e8f0;padding:6pt 8pt;text-align:left}
tfoot td{font-weight:bold}
.right{text-align:right}
.totals{margin-top:8pt}

@media print{
  body *{visibility:hidden !important}
  #printArea, #printArea *{visibility:visible !important}
  #printArea{position:absolute;inset:0;margin:0;padding:0}
}