:root {
  --bg: #f3f5fb; --card: #ffffff; --ink: #121a33; --muted: #5a6585; --line: #dde2f0;
  --brand: #1e40af; --brand-ink: #ffffff; --bad: #b91c1c; --good: #047857; --warn-bg: #fef2f2; --ok-bg: #ecfdf5; --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0d1224; --card: #151c36; --ink: #e8ecfa; --muted: #98a3c7; --line: #26305a;
          --brand: #7c9cff; --brand-ink: #0b1230; --bad: #f87171; --good: #34d399; --warn-bg: #3b1515; --ok-bg: #0e2b22; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; padding: 16px 16px 4px; max-width: 760px; margin: 0 auto; }
.top-actions { display: flex; gap: 8px; align-items: center; }
h1 { font-size: 1.5rem; margin: 0; letter-spacing: -.01em; }
h2 { font-size: 1.05rem; margin: 0 0 12px; }
.tagline { margin: 2px 0 0; color: var(--muted); font-size: .92rem; }
main { max-width: 760px; margin: 0 auto; padding: 8px 16px 40px; display: grid; gap: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
summary { cursor: pointer; font-weight: 650; min-height: 32px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.badge { font-weight: 700; color: var(--brand); padding: 0 4px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.field { display: grid; gap: 4px; min-width: 0; }
.field.wide { grid-column: 1 / -1; }
.field label { font-size: .85rem; color: var(--muted); }
input, select, textarea, button { font: inherit; }
input, select, textarea { width: 100%; min-height: 46px; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
textarea { resize: vertical; }
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--brand); outline-offset: 1px; }
button { min-height: 46px; padding: 8px 16px; border-radius: 10px; border: 0; cursor: pointer; background: var(--brand); color: var(--brand-ink); font-weight: 650; }
button.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
button.small { min-height: 38px; padding: 4px 12px; font-size: .9rem; }
button[hidden] { display: none; }
.lang select { min-height: 38px; width: auto; }
.line { border: 1px solid var(--line); border-radius: 12px; padding: 12px; margin-bottom: 12px; display: grid; gap: 10px; }
.line-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.line-head b { color: var(--muted); font-size: .85rem; }
.line-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.line-total { font-variant-numeric: tabular-nums; font-weight: 700; text-align: right; }
@media (max-width: 420px) { .line-grid { grid-template-columns: 1fr 1fr; } .grid { grid-template-columns: 1fr; } .field.wide { grid-column: auto; } }
dl#totals { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; margin: 0 0 12px; font-variant-numeric: tabular-nums; }
dl#totals dt { color: var(--muted); } dl#totals dd { margin: 0; text-align: right; }
dl#totals .grand { font-weight: 800; font-size: 1.2rem; color: var(--brand); border-top: 1px solid var(--line); padding-top: 8px; }
#errors:not(:empty) { background: var(--warn-bg); color: var(--bad); border-radius: 10px; padding: 8px 12px; margin-bottom: 10px; font-size: .92rem; }
#status:not(:empty) { background: var(--ok-bg); color: var(--good); border-radius: 10px; padding: 8px 12px; margin-bottom: 10px; font-size: .92rem; }
#status.warn { background: var(--warn-bg); color: var(--bad); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.actions button { flex: 1 1 140px; }
.history { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.history li { border: 1px solid var(--line); border-radius: 10px; padding: 10px; display: grid; gap: 8px; }
.history .meta { color: var(--muted); font-size: .85rem; }
.history .btns { display: flex; gap: 6px; flex-wrap: wrap; }
.hint { color: var(--muted); font-size: .85rem; margin: 12px 0 0; }
.empty { color: var(--muted); }

/* Print route (full Unicode: the browser draws the glyphs) */
#print-sheet { display: none; }
@media print {
  body { background: #fff; color: #000; padding: 0; }
  #app { display: none; }
  #print-sheet { display: block; font: 11pt/1.4 system-ui, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif; color: #000; }
  #print-sheet h1 { font-size: 20pt; margin: 0; } #print-sheet .r { text-align: right; }
  #print-sheet table { width: 100%; border-collapse: collapse; margin: 12pt 0; }
  #print-sheet th { background: #1e40af; color: #fff; padding: 4pt 6pt; text-align: left; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  #print-sheet td { padding: 4pt 6pt; border-bottom: 1px solid #ddd; vertical-align: top; }
  #print-sheet td.n, #print-sheet th.n { text-align: right; white-space: nowrap; }
  #print-sheet .tot { margin-left: auto; width: 55%; } #print-sheet .tot td { border: 0; }
  #print-sheet .grand td { font-weight: 700; border-top: 2px solid #1e40af; }
  #print-sheet .head { display: flex; justify-content: space-between; gap: 16pt; margin-bottom: 14pt; }
  #print-sheet .sig { border: 1px solid #999; height: 60pt; width: 55%; padding: 4pt; font-size: 8pt; color: #555; margin-top: 18pt; }
}