:root {
  --bg: #f3f4f1;
  --card: #ffffff;
  --ink: #1b1e22;
  --muted: #646b73;
  --line: #e1e3de;
  --accent: #0d4f8b;
  --accent-ink: #ffffff;
  --in: #1d7348;
  --in-bg: #e6f3ec;
  --out: #b1441c;
  --out-bg: #fbece5;
  --count: #5d47b0;
  --count-bg: #eeebfa;
  --stock: #0d4f8b;
  --stock-bg: #e5eef7;
  --warn: #8a5a00;
  --warn-bg: #fff4d6;
  --err: #a32020;
  --err-bg: #fde8e8;
  --ok: #1d7348;
  --ok-bg: #e6f3ec;
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a; --card: #1d2125; --ink: #e9ebe8; --muted: #9aa1a8; --line: #2e3338;
    --accent: #5aa3e6; --accent-ink: #0b1a28;
    --in: #5cc58e; --in-bg: #16301f; --out: #f08a62; --out-bg: #3a2016;
    --count: #a996f0; --count-bg: #262040; --stock: #5aa3e6; --stock-bg: #152a3d;
    --warn: #f0c050; --warn-bg: #33290f; --err: #f08080; --err-bg: #3a1717;
    --ok: #5cc58e; --ok-bg: #16301f;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
main { max-width: 760px; margin: 0 auto; padding: 16px 16px 64px; }
h1 { font-size: 22px; margin: 4px 0 14px; }
h2 { font-size: 17px; margin: 26px 0 10px; display: flex; align-items: baseline; gap: 10px; }
h2 .more { font-size: 14px; font-weight: 400; margin-left: auto; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }

/* 頂部列 */
.top {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line);
  padding-top: calc(10px + env(safe-area-inset-top));
  padding-left: calc(16px + env(safe-area-inset-left)); padding-right: calc(16px + env(safe-area-inset-right));
}
main { padding-bottom: calc(64px + env(safe-area-inset-bottom)); }
.top .brand { font-weight: 700; color: var(--ink); font-size: 18px; }
.top .loc { font-size: 13px; color: var(--muted); border: 1px solid var(--line); border-radius: 99px; padding: 1px 9px; }
.top nav { margin-left: auto; display: flex; align-items: center; gap: 14px; font-size: 15px; }
.menu { position: relative; }
.menu summary { list-style: none; cursor: pointer; color: var(--muted); }
.menu summary::-webkit-details-marker { display: none; }
.menu summary::after { content: " ▾"; font-size: 11px; }
.menu-pop {
  position: absolute; right: 0; top: 30px; background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 6px; min-width: 150px; display: grid; box-shadow: 0 8px 24px rgba(0,0,0,.12);
}
.menu-pop a, .menu-pop .linklike { padding: 8px 10px; border-radius: 8px; color: var(--ink); text-align: left; }
.menu-pop a:hover, .menu-pop .linklike:hover { background: var(--bg); }
.linklike { background: none; border: 0; font: inherit; cursor: pointer; width: 100%; }

/* 訊息 */
.flash { padding: 10px 14px; border-radius: 10px; margin-bottom: 12px; font-size: 15px; }
.flash.ok { background: var(--ok-bg); color: var(--ok); }
.flash.error { background: var(--err-bg); color: var(--err); }
.flash.warn, .hint.warn { background: var(--warn-bg); color: var(--warn); }

/* 卡片 */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 12px; }
.hint { font-size: 15px; }

/* 首頁大按鈕 */
.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.act {
  display: flex; flex-direction: column; justify-content: center; gap: 2px; min-height: 104px;
  padding: 16px; border-radius: 16px; border: 1px solid transparent;
}
.act b { font-size: 24px; }
.act span { font-size: 13px; opacity: .85; }
.act.in { background: var(--in-bg); color: var(--in); border-color: color-mix(in srgb, var(--in) 25%, transparent); }
.act.out { background: var(--out-bg); color: var(--out); border-color: color-mix(in srgb, var(--out) 25%, transparent); }
.act.count { background: var(--count-bg); color: var(--count); border-color: color-mix(in srgb, var(--count) 25%, transparent); }
.act.stock { background: var(--stock-bg); color: var(--stock); border-color: color-mix(in srgb, var(--stock) 25%, transparent); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 14px; }
.stats > * { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px; color: var(--ink); text-align: center; }
.stats b { display: block; font-size: 20px; font-variant-numeric: tabular-nums; }
.stats span { font-size: 12px; color: var(--muted); }
.stats .alert b { color: var(--err); }

/* 表單 */
label { display: block; font-size: 14px; color: var(--muted); margin: 12px 0 4px; }
input[type=text], input[type=password], input[type=number], input[type=search], input[type=date], select, textarea {
  width: 100%; font: inherit; font-size: 16px; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; min-height: 44px;
}
textarea { min-height: 70px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); border-color: var(--accent); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 44px;
  padding: 10px 18px; border-radius: 10px; border: 1px solid var(--line); background: var(--card);
  color: var(--ink); font: inherit; font-size: 15px; cursor: pointer; white-space: nowrap;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.in { background: var(--in); border-color: var(--in); color: #fff; }
.btn.out { background: var(--out); border-color: var(--out); color: #fff; }
.btn.count { background: var(--count); border-color: var(--count); color: #fff; }
.btn.big { width: 100%; min-height: 54px; font-size: 18px; font-weight: 600; margin-top: 18px; }
.btn.small { min-height: 34px; padding: 4px 12px; font-size: 14px; }
.btn.danger { color: var(--err); }
.row { display: flex; gap: 8px; align-items: center; }
.row > .grow { flex: 1; min-width: 0; }
.qty-input { font-size: 28px !important; text-align: center; font-weight: 600; font-variant-numeric: tabular-nums; -moz-appearance: textfield; }
.qty-input::-webkit-outer-spin-button, .qty-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
details > summary { white-space: nowrap; }
.stepper { display: grid; grid-template-columns: 56px 1fr 56px; gap: 8px; }
.stepper .btn { font-size: 24px; padding: 0; }

/* 原因（可點的膠囊） */
.pills { display: flex; flex-wrap: wrap; gap: 8px; }
.pills input { position: absolute; opacity: 0; pointer-events: none; }
.pills label {
  margin: 0; padding: 9px 14px; border: 1px solid var(--line); border-radius: 99px; background: var(--card);
  color: var(--ink); font-size: 15px; cursor: pointer;
}
.pills input:checked + label { border-color: var(--accent); background: var(--stock-bg); color: var(--accent); font-weight: 600; }
.pills input:focus-visible + label { outline: 2px solid var(--accent); }
.filters { display: flex; gap: 6px; flex-wrap: wrap; margin: 10px 0; }
.filters a { padding: 5px 12px; border-radius: 99px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font-size: 14px; }
.filters a.on { background: var(--ink); color: var(--card); border-color: var(--ink); }

/* 搜尋 + 掃描 */
.search { display: flex; gap: 8px; }
.search input { flex: 1; min-width: 0; }
.scanbox { margin-top: 10px; background: #000; border-radius: 12px; overflow: hidden; position: relative; }
.scanbox .scan-view { width: 100%; min-height: 220px; }
.scanbox.failed { background: var(--card); border: 1px solid var(--line); }
.scanbox.failed .scan-view { display: none; }
.scanbox .scan-bar { display: flex; justify-content: space-between; align-items: center; padding: 8px 10px; background: var(--card); }
.scan-msg { font-size: 14px; color: var(--muted); }

/* 清單 */
.list { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.item { display: flex; gap: 12px; align-items: center; padding: 12px 14px; border-top: 1px solid var(--line); color: var(--ink); }
.item:first-child { border-top: 0; }
a.item:hover { background: color-mix(in srgb, var(--bg) 60%, transparent); }
.item .main { flex: 1; min-width: 0; }
.item .name { font-weight: 600; overflow-wrap: anywhere; }
.item .sub { font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.item .qty { font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; min-width: 52px; }
.item .qty small { display: block; font-size: 11px; font-weight: 400; color: var(--muted); }
.neg { color: var(--err) !important; }
.empty { padding: 22px 16px; text-align: center; color: var(--muted); }

/* 紀錄 */
.mv { padding: 12px 14px; border-top: 1px solid var(--line); }
.mv:first-child { border-top: 0; }
.mv .head { display: flex; gap: 8px; font-size: 13px; color: var(--muted); flex-wrap: wrap; align-items: center; }
.mv .head .who { color: var(--ink); font-weight: 600; }
.mv .pname { margin-top: 2px; overflow-wrap: anywhere; }
.mv .delta { margin-left: auto; font-weight: 700; font-size: 18px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.mv .delta.plus { color: var(--in); }
.mv .delta.minus { color: var(--out); }
.mv .meta { font-size: 13px; color: var(--muted); margin-top: 2px; overflow-wrap: anywhere; }
.mv.struck .pname, .mv.struck .delta { text-decoration: line-through; opacity: .6; }
.tag { display: inline-block; font-size: 12px; padding: 0 8px; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); }
.tag.in { color: var(--in); border-color: color-mix(in srgb, var(--in) 35%, transparent); }
.tag.out { color: var(--out); border-color: color-mix(in srgb, var(--out) 35%, transparent); }
.tag.count { color: var(--count); border-color: color-mix(in srgb, var(--count) 35%, transparent); }
.tag.correction { color: var(--err); border-color: color-mix(in srgb, var(--err) 35%, transparent); }

/* 商品頁 */
.pcard .pname { font-size: 20px; font-weight: 700; overflow-wrap: anywhere; }
.bigstock { display: flex; gap: 12px; margin-top: 10px; flex-wrap: wrap; }
.bigstock div { background: var(--bg); border-radius: 10px; padding: 8px 14px; }
.bigstock b { font-size: 26px; font-variant-numeric: tabular-nums; }
.quick { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }
dl.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; margin: 8px 0 0; font-size: 14px; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; overflow-wrap: anywhere; }
details.card > summary { cursor: pointer; font-weight: 600; }

/* 表格（管理頁、匯入預覽） */
.tablewrap { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-top: 1px solid var(--line); vertical-align: top; }
thead th { border-top: 0; color: var(--muted); font-weight: 500; white-space: nowrap; background: color-mix(in srgb, var(--bg) 60%, var(--card)); }
table.wide th, table.wide td { white-space: nowrap; max-width: 240px; overflow: hidden; text-overflow: ellipsis; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.flagcell { color: var(--warn); }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 8px; margin: 12px 0; }
.kpis div { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; }
.kpis b { display: block; font-size: 22px; font-variant-numeric: tabular-nums; }
.kpis span { font-size: 13px; color: var(--muted); }
.mapgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.pager { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; font-size: 14px; }

.dupgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.dupside { border: 1px solid var(--line); border-radius: 10px; padding: 10px; display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.dupside .name { font-weight: 600; overflow-wrap: anywhere; }
.dupside .sub { font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.dupside .dupqty { margin: 4px 0 8px; }
.dupside .dupqty b { font-size: 20px; }
.dupside form { margin-top: auto; }
.dupside .btn { white-space: normal; }

.login { max-width: 360px; margin: 10vh auto 0; }
.login h1 { text-align: center; }

@media (max-width: 480px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .mapgrid { grid-template-columns: 1fr; }
  .top nav { gap: 10px; font-size: 14px; }
  .top .loc { display: none; }
}