:root{
  --bg:#f6f7f9;
  --panel:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --border:#e5e7eb;
  --btn:#111827;
  --btn2:#ffffff;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, Helvetica;
  background:var(--bg);
  color:var(--text);
}
.topbar{
  position:sticky; top:0; z-index:10;
  background:rgba(246,247,249,.9);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--border);
  padding:12px 16px;
  display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap;
}
.brand{font-weight:900}
.sub{font-size:12px; color:var(--muted)}
.btn{
  background:var(--btn);
  color:#fff;
  border:none;
  border-radius:10px;
  padding:10px 12px;
  cursor:pointer;
}
.btnSecondary{
  background:var(--btn2);
  color:var(--text);
  border:1px solid var(--border);
  border-radius:10px;
  padding:9px 11px;
  cursor:pointer;
}
.btn:disabled{opacity:.65; cursor:not-allowed}
.layout{
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px;
  display:grid;
  grid-template-columns: 420px 1fr;
  gap:14px;
  align-items:start;
}
@media (max-width: 980px){
  .layout{grid-template-columns:1fr}
}
.panel, .preview{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:12px;
  padding:12px;
}
h2{font-size:14px; margin:0 0 10px}
label{display:block; font-size:12px; color:var(--muted); margin:10px 0 6px}
input, textarea, select{
  width:100%;
  border:1px solid var(--border);
  border-radius:10px;
  padding:10px 10px;
  font: inherit;
  background:#fff;
}
textarea{min-height:80px; resize:vertical}
.row{display:flex; gap:10px; flex-wrap:wrap}
.col{flex:1; min-width:140px}
.between{justify-content:space-between; align-items:center}
.hr{height:1px; background:var(--border); margin:12px 0}
.itemCard{
  border:1px solid var(--border);
  border-radius:12px;
  padding:10px;
  margin-top:10px;
}
.itemActions{display:flex; justify-content:flex-end; margin-top:8px}

/* Preview frame */
.previewFrame{
  background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
  border:1px dashed #d1d5db;
  border-radius:12px;
  padding:12px;
  overflow:auto;
}
.invoiceScale{
  transform-origin: top left;
  display:inline-block;
}

/* ===== Invoice (Letter at 96dpi: 816 x 1056) ===== */
.invoicePage{
  width: 816px;
  height: 1056px;
  background:#fff;
  position:relative;
  overflow:hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
}

/* Colors from sample */
.invDark{color:#333333}
.invGrey{color:#777777}
.invHeader{color:#3a3a3a}

.invLogo{
  position:absolute;
  left:49px; top:19px;
  width:150px; height:150px;
  border-radius:12px;
  overflow:hidden;
  background:#fff;
}
.invLogo img{width:100%; height:100%; object-fit:cover}

.invTitle{
  position:absolute;
  left:615px; top:37px;
  font-size:37px; /* 27.75pt */
  letter-spacing:1px;
}
.invNo{
  position:absolute;
  left:713px; top:78px;
  font-size:16px; /* 12pt */
}

.invCompany{
  position:absolute;
  left:64px; top:190.5px;
  font-size:13px; /* 9.75pt */
  font-weight:700;
  white-space:pre-wrap;
  max-width: 420px;
  line-height: 1.25;
}

.invBillLabel{
  position:absolute;
  left:64px; top:242.5px;
  font-size:13px;
}
.invBillTo{
  position:absolute;
  left:64px; top:263.5px;
  font-size:13px;
  font-weight:700;
}

.invDates{
  position:absolute;
  right: 64px;
  top: 146px;
  font-size:13px;
  width: 210px;
}
.invDates .row2{
  display:flex; justify-content:space-between; gap:10px;
  margin-bottom: 10px;
}
.invDates .lbl{color:#777777}

.invBalance{
  position:absolute;
  left:427px; top:198px;
  width:351px; height:34px;
  background:#f5f5f5;
  border-radius:10px;
  display:flex; align-items:center;
  padding:0 18px;
  font-size:15px; /* 11.25pt */
}
.invBalance .lbl{font-weight:800; flex:1; text-align:center}
.invBalance .val{font-weight:800; width:120px; text-align:right}

.invTableHeader{
  position:absolute;
  left:39px; top:331px;
  width:734px; height:28px;
  background:#3a3a3a;
  border-radius:8px;
  display:flex; align-items:center;
  color:#fff;
  font-size:13px;
}
.invTableHeader .c1{width:438px; padding-left:20px}
.invTableHeader .c2{width:100px; text-align:center}
.invTableHeader .c3{width:100px; text-align:center}
.invTableHeader .c4{width:96px; padding-right:20px; text-align:right}

.invRows{
  position:absolute;
  left:39px;
  top: 373px;
  width:734px;
  font-size:13px;
}
.invRow{
  display:flex;
  align-items:flex-start;
  padding: 0;
  margin: 0 0 18px 0; /* rowStep ~24px */
}
.invRow .c1{width:438px; padding-left:20px; font-weight:700; white-space:pre-wrap}
.invRow .c2{width:100px; text-align:center}
.invRow .c3{width:100px; text-align:right; padding-right:6px}
.invRow .c4{width:96px; text-align:right; padding-right:20px}

.invTotals{
  position:absolute;
  left: 560px;
  top: 458.5px;
  width: 240px;
  font-size:13px;
}
.invTotals .trow{display:flex; justify-content:space-between; margin-bottom: 14px}
.invTotals .lbl{color:#777777; width:120px; text-align:right; padding-right:10px}
.invTotals .val{color:#333; width:110px; text-align:right}

.invSection{
  position:absolute;
  left:64px;
  width: 700px;
  font-size:13px;
  line-height:1.35;
}
.invSection .lbl{color:#777777; margin-bottom: 6px}
.invSection .txt{white-space:pre-wrap; color:#333}