:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1a2333;
  --muted: #6b7689;
  --line: #e4e9f2;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --danger: #dc2626;
  --radius: 12px;
}
* { box-sizing: border-box; }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
body {
  margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.5;
}
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 20px; }

.site-header { background: linear-gradient(135deg, #1e3a8a, #2563eb); color: #fff; padding: 28px 0 22px; }
.brand { font-size: 1.4rem; }
.tag { background: rgba(255,255,255,.2); font-size: .72rem; padding: 3px 10px; border-radius: 999px; vertical-align: middle; margin-left: 8px; }
.subtitle { opacity: .85; margin: 6px 0 0; }

.layout { display: grid; grid-template-columns: 420px 1fr; gap: 24px; padding: 24px 20px 40px; align-items: start; }
@media (max-width: 980px) { .layout { grid-template-columns: 1fr; } }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(16,24,40,.05); }
.card h2 { font-size: 1rem; margin: 0 0 12px; display: flex; align-items: center; justify-content: space-between; }
label { display: block; font-size: .82rem; font-weight: 600; margin-bottom: 10px; color: #374151; }
.opt { font-weight: 400; color: var(--muted); }
input, textarea, select {
  width: 100%; margin-top: 4px; padding: 9px 11px; font-size: .92rem;
  border: 1px solid var(--line); border-radius: 8px; background: #fbfcfe; color: var(--ink);
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); border-color: var(--accent); background: #fff; }
textarea { resize: vertical; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.sr { position: static; }

.item-row { display: grid; grid-template-columns: 1fr 64px 96px 96px 34px; gap: 8px; margin-bottom: 8px; align-items: end; }
.item-row .amt { padding: 9px 4px; font-size: .9rem; font-weight: 600; text-align: right; }
.item-del { border: none; background: none; color: var(--danger); font-size: 1.1rem; cursor: pointer; padding: 6px; border-radius: 6px; }
.item-del:hover { background: #fee2e2; }

.btn { border: 1px solid var(--line); background: #fff; color: var(--ink); padding: 10px 18px; border-radius: 9px; font-size: .92rem; font-weight: 600; cursor: pointer; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.small { padding: 5px 12px; font-size: .8rem; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); color: #fff; }
.btn.danger-ghost { color: var(--danger); }
.btn.danger-ghost:hover { border-color: var(--danger); color: var(--danger); background: #fef2f2; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 4px 0 10px; }
.fineprint { font-size: .78rem; color: var(--muted); }

/* ---------- Invoice preview ---------- */
.preview-col { position: sticky; top: 20px; }
@media (max-width: 980px) { .preview-col { position: static; } }
.invoice { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 40px; box-shadow: 0 4px 18px rgba(16,24,40,.08); }
.inv-head { display: flex; justify-content: space-between; gap: 20px; border-bottom: 3px solid var(--ink); padding-bottom: 18px; margin-bottom: 18px; }
.inv-head h1 { margin: 0 0 6px; font-size: 1.5rem; }
.muted { color: var(--muted); font-size: .85rem; margin: 2px 0; white-space: pre-line; }
.inv-title { text-align: right; }
.inv-title span { display: block; font-size: .8rem; letter-spacing: .25em; color: var(--muted); }
.inv-title strong { font-size: 1.2rem; }
.inv-meta { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.inv-meta .lbl { display: block; font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 4px; }
.dates { text-align: right; display: flex; gap: 28px; }
.inv-table { width: 100%; border-collapse: collapse; margin-bottom: 8px; }
.inv-table th { text-align: left; font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); border-bottom: 2px solid var(--line); padding: 8px 6px; }
.inv-table td { padding: 10px 6px; border-bottom: 1px solid var(--line); font-size: .92rem; }
.inv-table .r { text-align: right; }
.inv-totals { margin-left: auto; width: 280px; margin-top: 10px; }
.inv-totals > div { display: flex; justify-content: space-between; padding: 5px 0; font-size: .92rem; }
.inv-totals .grand { border-top: 2px solid var(--ink); margin-top: 6px; padding-top: 10px; font-size: 1.1rem; }
.inv-notes { margin-top: 24px; font-size: .85rem; color: var(--muted); white-space: pre-line; border-top: 1px solid var(--line); padding-top: 14px; }

.site-footer { border-top: 1px solid var(--line); padding: 18px 0 28px; color: var(--muted); font-size: .85rem; text-align: center; }

@media print {
  .no-print, .site-footer { display: none !important; }
  body { background: #fff; }
  .layout { display: block; padding: 0; }
  .invoice { border: none; box-shadow: none; border-radius: 0; padding: 0; }
}

/* ---------- Mobile ---------- */
@media (max-width: 640px) {
  .wrap { padding: 0 12px; }
  .layout { padding: 16px 12px 32px; }
  .grid2, .grid3 { grid-template-columns: 1fr; }
  .item-row { grid-template-columns: 1fr 1fr 1fr 34px; }
  .item-row .i-desc { grid-column: 1 / -1; }
  .item-row .amt { text-align: right; }
  .card { padding: 14px; }
  .invoice { padding: 22px 18px; }
  .inv-head { flex-direction: column; gap: 12px; }
  .inv-title { text-align: left; }
  .inv-meta { flex-direction: column; }
  .dates { text-align: left; }
  .inv-totals { width: 100%; }
}