:root {
  --bg: #fbf7f2; --card: #ffffff; --ink: #2b2118; --muted: #7a6b5d; --line: #eadfd3;
  --brand: #d9480f; --brand-ink: #ffffff; --brand-soft: #ffe8d9; --ok: #2b8a3e; --ok-soft: #e3f6e8;
  --warn: #b7791f; --warn-soft: #fff3d6; --bad: #c92a2a; --bad-soft: #fde8e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1612; --card: #26201a; --ink: #f3ebe2; --muted: #a8998b; --line: #3a3128;
    --brand: #ff8a4c; --brand-ink: #1b1612; --brand-soft: #4a2c1b; --ok: #6fcf86; --ok-soft: #1f3a27;
    --warn: #f0c36a; --warn-soft: #3d3118; --bad: #ff8787; --bad-soft: #43201f;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.5 -apple-system, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  padding-bottom: calc(76px + env(safe-area-inset-bottom));
}
#app { max-width: 720px; margin: 0 auto; padding: 12px 16px; }
h1 { font-size: 22px; margin: 4px 0 2px; }
h2 { font-size: 17px; margin: 0 0 8px; }
.muted { color: var(--muted); font-size: 14px; }
.row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.grow { flex: 1; min-width: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px; margin: 12px 0; }
.card.center { text-align: center; padding: 28px 16px; }
.banner { border-radius: 12px; padding: 10px 14px; margin: 12px 0; font-weight: 600; }
.banner.ok { background: var(--ok-soft); color: var(--ok); }
.banner.warn { background: var(--warn-soft); color: var(--warn); }
.banner.bad { background: var(--bad-soft); color: var(--bad); }
.banner.brand { background: var(--brand-soft); color: var(--brand); }
button, .btn {
  font: inherit; min-height: 46px; padding: 0 16px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); cursor: pointer; touch-action: manipulation;
}
button:active { transform: scale(.98); }
button:disabled { opacity: .5; cursor: default; }
button.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); font-weight: 700; }
button.small { min-height: 36px; padding: 0 12px; font-size: 14px; border-radius: 10px; }
button.danger { color: var(--bad); }
button.link { border: 0; background: none; color: var(--brand); min-height: 32px; padding: 0 4px; text-decoration: underline; }
input, select, textarea {
  font: inherit; width: 100%; min-height: 46px; padding: 8px 12px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
textarea { min-height: 120px; resize: vertical; }
label { display: block; font-size: 14px; color: var(--muted); margin: 10px 0 4px; }
.menu { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.menu button {
  min-height: 64px; display: flex; flex-direction: column; justify-content: center; align-items: center;
  gap: 2px; font-weight: 600; text-align: center;
}
.menu button .price { font-weight: 400; font-size: 13px; color: var(--muted); }
.menu button.sel { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.menu button.sel .price { color: var(--brand-ink); opacity: .85; }
.menu button[disabled] { opacity: .45; }
.tally .item { padding: 8px 0; border-bottom: 1px dashed var(--line); }
.tally .item:last-child { border-bottom: 0; }
.tally .count { font-weight: 700; color: var(--brand); }
.pill { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; background: var(--brand-soft); color: var(--brand); }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.gray { background: var(--line); color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: 13px; color: var(--muted); font-weight: 600; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
pre.copy { white-space: pre-wrap; word-break: break-word; background: var(--bg); border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 12px; font: 14px/1.6 inherit; margin: 8px 0; }
.nav {
  position: fixed; left: 0; right: 0; bottom: 0; display: flex; background: var(--card); border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom); z-index: 5;
}
.nav button { flex: 1; border: 0; border-radius: 0; background: none; min-height: 60px; font-size: 13px; color: var(--muted); line-height: 1.3; }
.nav button .ico { display: block; font-size: 20px; }
.nav button.on { color: var(--brand); font-weight: 700; }
#toast {
  position: fixed; left: 50%; bottom: calc(90px + env(safe-area-inset-bottom)); transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 999px; font-size: 15px;
  opacity: 0; pointer-events: none; transition: opacity .2s; max-width: 90vw; z-index: 9;
}
#toast.show { opacity: .95; }
.names { display: grid; gap: 8px; margin: 10px 0; }
.names button { text-align: left; }
.names button.sel { border-color: var(--brand); background: var(--brand-soft); font-weight: 700; }
.big-code { font-size: 34px; letter-spacing: 6px; font-weight: 800; color: var(--brand); }
details > summary { cursor: pointer; padding: 6px 0; font-weight: 600; }
.kv { display: flex; justify-content: space-between; gap: 8px; padding: 6px 0; border-bottom: 1px dashed var(--line); }
@media (max-width: 380px) { .menu { grid-template-columns: 1fr 1fr; } }