:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1c1f26;
  --muted: #6b7280;
  --line: #e3e6ea;
  --brand: #2f6f4f;
  --brand-ink: #ffffff;
  --accent: #2563eb;
  --warn-bg: #fff4e0;
  --warn-ink: #8a5a00;
  --ok: #1f9d55;
  --danger: #c0392b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --card: #1e2127;
    --ink: #e8eaed;
    --muted: #9aa0aa;
    --line: #2c3038;
    --brand: #4c9c73;
    --accent: #6ea8fe;
    --warn-bg: #3a2f1a;
    --warn-ink: #e8c98a;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 20px 16px 80px; }
h1 { font-size: 1.4rem; margin: .2em 0 .1em; }
h2 { font-size: 1.1rem; margin: 1.4em 0 .5em; }
p.lead { color: var(--muted); margin-top: 0; }
a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin: 14px 0;
}

label { display: block; font-weight: 600; margin: 10px 0 4px; font-size: .9rem; }
input[type=text], input[type=number], input[type=file], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--ink);
  font: inherit;
}
textarea { min-height: 60px; resize: vertical; }

button, .btn {
  font: inherit;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
button.primary, .btn.primary {
  background: var(--brand);
  color: var(--brand-ink);
  border-color: transparent;
}
button.ghost { background: transparent; }
button.danger { color: var(--danger); border-color: var(--danger); background: transparent; }
button:disabled { opacity: .5; cursor: not-allowed; }
button.small, .btn.small { padding: 6px 10px; font-size: .85rem; }

.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row.between { justify-content: space-between; }
.grow { flex: 1; min-width: 0; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.mono { font-variant-numeric: tabular-nums; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.right { text-align: right; }
.nowrap { white-space: nowrap; }

.warn {
  background: var(--warn-bg);
  color: var(--warn-ink);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 8px 0;
  font-size: .9rem;
}
.error { background: #fde8e6; color: var(--danger); border-radius: 10px; padding: 10px 12px; margin: 8px 0; }
@media (prefers-color-scheme: dark) { .error { background: #3a2320; } }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }

.cathead { font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 16px 0 2px; }
.cathead:first-of-type { margin-top: 6px; }
tr.catrow td { background: var(--bg); font-size: .82rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); padding-top: 12px; }

table.totals { margin-top: 10px; }
table.totals td { border: none; padding: 4px 6px; }
table.totals tr.grand td { border-top: 2px solid var(--line); padding-top: 10px; font-size: 1.05rem; }

.item-row { display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.item-row .name { font-weight: 600; }
.item-row .sub { color: var(--muted); font-size: .85rem; }
.qtybox { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.qtybox input { width: 68px; text-align: center; }
.stepper { width: 34px; height: 34px; padding: 0; font-size: 1.1rem; justify-content: center; }
.qtynum { min-width: 26px; text-align: center; font-size: 1.05rem; font-weight: 700; }
.halfbtn { padding: 6px 10px; font-size: .8rem; border-radius: 999px; white-space: nowrap; }
.halfbtn.active { background: var(--brand); color: var(--brand-ink); border-color: transparent; }

.pill { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.pill.paid { background: rgba(31,157,85,.15); color: var(--ok); }
.pill.open { background: rgba(107,114,128,.15); color: var(--muted); }
.pill.mine { background: rgba(37,99,235,.15); color: var(--accent); }

.copyfield { display: flex; gap: 8px; align-items: center; margin: 6px 0; }
.copyfield code { flex: 1; background: var(--bg); padding: 8px 10px; border-radius: 8px; overflow-x: auto; border: 1px solid var(--line); }

.qr { background: #fff; padding: 12px; border-radius: 12px; display: inline-block; }
.qr img, .qr canvas, .qr table { display: block; width: 220px; height: 220px; }

.tabbar { display: flex; gap: 6px; margin: 10px 0; flex-wrap: wrap; }
.tabbar button.active { background: var(--brand); color: var(--brand-ink); border-color: transparent; }

.toast {
  position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%);
  background: var(--ink); color: var(--bg);
  padding: 10px 16px; border-radius: 10px; font-size: .9rem;
  opacity: 0; transition: opacity .2s; pointer-events: none; z-index: 50;
}
.toast.show { opacity: 1; }

hr { border: none; border-top: 1px solid var(--line); margin: 16px 0; }
details summary { cursor: pointer; font-weight: 600; }