:root{
  --bg:#FFFFFF;
  --panel:#F7F8FA;
  --panel-hover:#EEF1F5;
  --border:#E1E4E9;

  --text:#111827;
  --text-muted:#6B7280;

  --blue:#2563EB;
  --blue-hover:#1D4ED8;
  --blue-soft:rgba(37,99,235,.08);
  --danger:#DC2626;
  --danger-soft:rgba(220,38,38,.08);

  --radius-sm:4px;
  --radius-md:8px;

  --font-sans:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  --ease:cubic-bezier(.4,0,.2,1);
}

*{margin:0;padding:0;box-sizing:border-box;}

body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  -webkit-font-smoothing:antialiased;
}

::selection{background:var(--blue); color:#fff;}

input, textarea{
  font-family:var(--font-sans);
  font-size:.92rem;
}

button{font-family:var(--font-sans); cursor:pointer;}

a{color:inherit; text-decoration:none;}

.letterhead{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:20px clamp(20px,4vw,56px);
  border-bottom:1px solid var(--border);
}

.wordmark{display:flex; align-items:center; gap:10px;}
.wordmark-mark{
  display:flex; align-items:center; justify-content:center;
  width:32px; height:32px;
  color:var(--blue);
}
.wordmark-mark svg{width:22px; height:22px;}
.wordmark-text{
  font-size:1.05rem;
  font-weight:600;
  color:var(--text);
}
.wordmark-text em{font-style:normal; font-weight:400; color:var(--text-muted);}

.workspace{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(430px,560px);
  gap:0;
  align-items:start;
}

.ledger-form{
  padding:44px clamp(20px,4vw,48px) 80px;
  max-width:760px;
}

.folio-section{
  padding-bottom:40px;
  margin-bottom:40px;
  border-bottom:1px solid var(--border);
  scroll-margin-top:24px;
}
.folio-section:last-child{border-bottom:none;}

.folio-section h2{
  font-weight:600;
  font-size:1.3rem;
  color:var(--text);
  display:flex;
  flex-direction:column;
  gap:4px;
  margin-bottom:24px;
}
.sec-eyebrow{
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--blue);
  order:-1;
}

.field-grid{display:grid; gap:16px; margin-bottom:16px;}
.field-grid.two{grid-template-columns:1fr 1fr;}
.field-grid.three{grid-template-columns:1fr 1fr 1fr;}

.field label{
  display:block;
  font-size:.78rem;
  color:var(--text-muted);
  margin-bottom:6px;
}
.field input, .field textarea{
  width:100%;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:10px 12px;
  color:var(--text);
  transition:border-color .15s var(--ease), background .15s var(--ease);
}
.field textarea{resize:vertical; min-height:56px; line-height:1.5;}
.field input:focus, .field textarea:focus{
  outline:none;
  border-color:var(--blue);
  background:#fff;
}
.mono-input{letter-spacing:.02em;}

.party-grid{display:grid; grid-template-columns:1fr 1fr; gap:20px;}
.party-card{
  position:relative;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:20px 18px 8px;
}
.party-tag{
  position:absolute; top:-10px; left:16px;
  background:#fff;
  padding:0 8px;
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--blue);
  border:1px solid var(--border);
  border-radius:20px;
}

@media (max-width:900px){
  .party-grid{grid-template-columns:1fr;}
  .field-grid.three{grid-template-columns:1fr 1fr;}
}

.ledger-table{border-top:1px solid var(--border);}
.ledger-head{
  display:flex; gap:10px;
  padding:10px 4px;
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.04em;
  text-transform:uppercase;
  color:var(--text-muted);
  border-bottom:1px solid var(--border);
}
.item-row{
  display:flex; gap:10px; align-items:center;
  padding:10px 4px;
  border-bottom:1px solid var(--border);
}
.col-desc{flex:3.4;}
.col-qty{flex:.7; text-align:center;}
.col-price{flex:1.1; text-align:center;}
.col-amount, .col-total{flex:1.1; text-align:right;}
.col-action{width:26px;}

.item-row input, .item-row select{
  width:100%;
  background:transparent;
  border:none;
  border-bottom:1px solid transparent;
  color:var(--text);
  padding:6px 4px;
  font-size:.88rem;
  text-align:inherit;
}
.item-row .item-desc{text-align:left;}
.item-row input:focus, .item-row select:focus{
  outline:none;
  border-bottom-color:var(--blue);
}
.item-row select{font-family:var(--font-sans);}
.item-row option{background:#fff; color:var(--text);}
.item-amount{
  font-size:.88rem;
  font-weight:500;
  color:var(--text);
  display:block;
  text-align:right;
}
.remove-item{
  background:none; border:none;
  color:var(--text-muted);
  width:22px; height:22px;
  border-radius:50%;
  font-size:1.1rem;
  line-height:1;
  transition:color .15s, background .15s;
}
.remove-item:hover{color:var(--danger); background:var(--danger-soft);}

.add-line{
  margin-top:14px;
  width:100%;
  display:flex; align-items:center; justify-content:center; gap:8px;
  padding:11px;
  background:transparent;
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  color:var(--blue);
  font-size:.82rem;
  font-weight:500;
  transition:border-color .15s var(--ease), background .15s var(--ease);
}
.add-line:hover{border-color:var(--blue); background:var(--blue-soft);}

.summary-block{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:18px 20px;
}
.summary-line{
  display:flex; justify-content:space-between;
  padding:8px 0;
  border-bottom:1px solid var(--border);
  font-size:.88rem;
  color:var(--text-muted);
}
.summary-line.grand{
  border-bottom:none;
  padding-top:14px;
  color:var(--text);
  font-size:1rem;
  font-weight:600;
}
.mono-value{font-variant-numeric:tabular-nums;}
.summary-line.grand .mono-value{color:var(--blue); font-size:1.15rem;}

.control-row{display:flex; align-items:center; gap:14px; margin-top:30px; flex-wrap:wrap;}

.btn-stamp{
  display:inline-flex; align-items:center; gap:10px;
  padding:12px 22px;
  background:var(--blue);
  color:#fff;
  border:none;
  border-radius:var(--radius-sm);
  font-weight:600;
  font-size:.86rem;
  transition:background .15s var(--ease), transform .1s var(--ease);
}
.btn-stamp:hover{background:var(--blue-hover);}
.btn-stamp:active{transform:scale(.98);}
.btn-stamp:disabled{opacity:.6; cursor:progress; transform:none;}
.stamp-ring{
  width:22px; height:22px;
  border-radius:50%;
  border:1.5px solid rgba(255,255,255,.5);
  display:flex; align-items:center; justify-content:center;
}

.btn-ghost{
  padding:11px 22px;
  background:transparent;
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  color:var(--text);
  font-size:.86rem;
  transition:border-color .15s var(--ease), color .15s var(--ease);
}
.btn-ghost:hover{border-color:var(--blue); color:var(--blue);}

.btn-text-danger{
  background:none; border:none;
  color:var(--danger);
  font-size:.82rem;
  text-decoration:underline;
  text-underline-offset:3px;
}
.btn-text-danger:hover{opacity:.8;}

.preview-column{padding:44px clamp(16px,3vw,40px) 80px 0;}
.preview-sticky{position:sticky; top:24px;}

.invoice-paper{
  background:#fff;
  color:var(--text);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  display:flex;
  overflow:hidden;
}
.paper-margin{display:none;}
.paper-content{padding:36px 32px; flex:1; min-width:0;}

.paper-head{display:flex; justify-content:space-between; gap:16px; margin-bottom:26px;}
.paper-brand{font-weight:700; font-size:1.05rem;}
.paper-brand.small{font-size:.98rem;}
.paper-meta{font-size:.78rem; color:var(--text-muted); margin-top:2px; line-height:1.5;}

.paper-title{text-align:right;}
.invoice-word{
  font-weight:700;
  font-size:1.5rem;
  color:var(--blue);
  margin-bottom:8px;
}
.meta-row{
  display:flex; justify-content:flex-end; gap:10px;
  font-size:.76rem;
  margin-bottom:2px;
}
.meta-row span:first-child{color:var(--text-muted); text-transform:uppercase; letter-spacing:.04em; font-size:.65rem; align-self:center;}
.meta-row .mono-value{font-size:.82rem;}

.bill-to{
  padding:14px 16px;
  background:var(--panel);
  border-radius:var(--radius-sm);
  margin-bottom:24px;
}
.bill-to-tag{
  display:block;
  font-size:.65rem;
  font-weight:600;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--blue);
  margin-bottom:6px;
}

.paper-items{margin-bottom:22px;}
.paper-items-head{
  display:flex; gap:10px;
  padding-bottom:8px;
  border-bottom:1.5px solid var(--text);
  font-size:.66rem;
  letter-spacing:.04em;
  text-transform:uppercase;
  color:var(--text-muted);
}
.preview-item-row{
  display:flex; gap:10px;
  padding:10px 0;
  border-bottom:1px solid var(--border);
  font-size:.84rem;
}
.preview-item-row.empty-message{
  justify-content:center;
  color:var(--text-muted);
  border-bottom:none;
  padding:20px 0;
}

.paper-foot{display:flex; gap:24px; flex-wrap:wrap; margin-bottom:20px;}
.paper-notes{flex:1.3; min-width:180px;}
.paper-notes p{font-size:.82rem; color:var(--text-muted); margin-top:6px; line-height:1.6;}
.totals-stack{flex:1; min-width:180px;}
.total-row{display:flex; justify-content:space-between; font-size:.82rem; padding:4px 0; color:var(--text-muted);}

.amount-due{
  margin-top:10px;
  padding:12px 14px;
  border:1px solid var(--blue);
  border-radius:var(--radius-sm);
  display:flex; justify-content:space-between; align-items:center;
  background:var(--blue-soft);
}
.amount-due span:first-child{
  font-size:.66rem;
  font-weight:600;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--blue);
}
.amount-due .mono-value{font-size:1.1rem; font-weight:700; color:var(--text);}

.paper-signoff{
  text-align:center;
  font-size:.86rem;
  color:var(--text-muted);
  padding-top:16px;
  border-top:1px solid var(--border);
}

.pdf-capture-wrapper{
  position:fixed;
  top:0;
  left:-10000px;
  width:794px;
  background:#fff;
  pointer-events:none;
}
.pdf-capture-wrapper .invoice-paper{
  border:none;
  border-radius:0;
}

@media (max-width:1180px){
  .workspace{grid-template-columns:minmax(0,1fr);}
  .preview-column{
    grid-column:1 / -1;
    padding:0 clamp(20px,4vw,48px) 60px;
  }
  .preview-sticky{position:relative; top:0;}
}

@media (max-width:640px){
  .letterhead{padding:16px 18px;}
  .wordmark-text{font-size:1rem;}
  .workspace{grid-template-columns:1fr;}
  .ledger-form{padding:28px 18px 50px;}
  .preview-column{padding:0 12px 50px;}
  .field-grid.three{grid-template-columns:1fr;}
  .field-grid.two{grid-template-columns:1fr;}
  .party-grid{grid-template-columns:1fr;}
  .paper-head{flex-direction:column;}
  .paper-title{text-align:left;}
  .meta-row{justify-content:space-between;}
  .control-row{flex-direction:column; align-items:stretch;}
  .btn-stamp, .btn-ghost{justify-content:center;}
}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important;}
}

@media print {
  @page {
    size: A4;
    margin: 0;
  }

  html,
  body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: #fff;
  }

  body * {
    visibility: hidden;
  }

  .preview-column,
  .invoice-paper,
  .invoice-paper * {
    visibility: visible;
  }

  .preview-column {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    padding: 0;
  }

  .preview-sticky {
    position: static;
  }

  .invoice-paper {
    position: relative;
    left: auto;
    top: auto;
    width: 100%;
    min-height: 0;
    border: none;
    margin: 0;
  }

  .paper-content {
    padding: 36px 32px;
  }
}

.pdf-brand-tag {
    color: #2563EB;
    text-align: center;
    padding-top: 10px;
    font-size: 0.65rem;
}
.pdf-brand-text {
    color: #6B7280;
}