:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --ink: #182334;
  --muted: #576577;
  --line: #e3e7ee;
  --accent: #2453ae;
  --danger: #b3261e;
  --ok: #1a7f37;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.brand { font-weight: 700; }
.brand .dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
}
.store { color: var(--muted); font-size: 14px; }

.layout {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(360px, 2fr);
  gap: 16px;
  padding: 16px;
  align-items: start;
}

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.row { display: flex; gap: 8px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
@media (max-width: 560px) { .grid2, .grid3 { grid-template-columns: 1fr; } }

input, select, textarea {
  width: 100%;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
  background: #fff;
  color: inherit;
}

label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
label input, label select, label textarea { margin-top: 3px; }

fieldset {
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 14px 0 0;
  padding: 12px;
}
legend { font-size: 13px; color: var(--muted); padding: 0 6px; }

.btn {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  padding: 8px 14px;
  font: inherit;
  cursor: pointer;
}
.btn.secondary { background: #fff; color: var(--accent); }
.btn.primary { font-weight: 600; }
.btn.small { padding: 4px 10px; font-size: 13px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.link { border: 0; background: none; color: var(--danger); cursor: pointer; font: inherit; padding: 0; }

.results { list-style: none; margin: 12px 0 0; padding: 0; }
.results li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--line);
}
.results li span:first-child { flex: 1; }
.results .price { color: var(--muted); font-variant-numeric: tabular-nums; }

table.lines { width: 100%; border-collapse: collapse; }
table.lines th, table.lines td { padding: 6px 4px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.lines th { text-align: left; font-size: 12px; color: var(--muted); text-transform: uppercase; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td.num input { text-align: right; }
input.qty { width: 72px; }

.totals { margin-top: 14px; border-top: 2px solid var(--line); padding-top: 10px; }
.total-row { display: flex; justify-content: space-between; padding: 3px 0; font-variant-numeric: tabular-nums; }
.total-row.grand { font-weight: 700; font-size: 17px; color: var(--accent); border-top: 1px solid var(--line); margin-top: 4px; padding-top: 8px; }

.actions { display: flex; gap: 10px; margin-top: 14px; }

.status { font-size: 13px; color: var(--muted); min-height: 18px; margin-top: 8px; }
.status.error { color: var(--danger); }
.status.ok { color: var(--ok); }

.entitlement-banner {
  margin: 0;
  padding: 12px 20px;
  background: #fdecea;
  color: var(--danger);
  border-bottom: 1px solid var(--line);
}

.centered { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 24px; }
.placeholder, .document {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px;
  max-width: 640px;
}
.placeholder small, .document small { color: var(--muted); letter-spacing: 0.08em; }
.placeholder h1, .document h1 { margin: 12px 0; }
.muted { color: var(--muted); }
.document h2 { font-size: 16px; margin-top: 22px; }
.document code { background: var(--bg); padding: 1px 5px; border-radius: 4px; }
.fatal { padding: 32px; color: var(--danger); }

.demo-notice { padding: 12px 20px; background: #eaf0fb; border-bottom: 1px solid var(--line); }
.demo-notice a { color: var(--accent); margin-left: 8px; }