:root {
  color-scheme: light;
  --bg: #f4f6f9;
  --card: #ffffff;
  --fg: #1a1e26;
  --muted: #636c7b;
  --line: #e1e5ec;
  --field: #fbfcfd;
  --accent: #2557c9;
  --accent-hover: #1d47a8;
  --accent-soft: #e8eefb;
  --on-accent: #ffffff;
  --warn: #8a4b00;
  --warn-soft: #fff4e2;
  --warn-line: #f1d3a3;
  --bad: #b42318;
  --bad-soft: #fdeceb;
  --bad-line: #f4c5c0;
  --good: #1f6f5c;
  --good-soft: #e6f2ed;
  --shadow: 0 1px 2px rgba(20, 25, 40, .05), 0 4px 16px rgba(20, 25, 40, .04);
  --radius: 12px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #10131a;
    --card: #181c25;
    --fg: #e4e8f0;
    --muted: #97a0b0;
    --line: #2a303c;
    --field: #13161e;
    --accent: #7aa2f7;
    --accent-hover: #96b6fa;
    --accent-soft: #1a2440;
    --on-accent: #0b1020;
    --warn: #f0b35a;
    --warn-soft: #2b2314;
    --warn-line: #5a4620;
    --bad: #f2877c;
    --bad-soft: #2f1917;
    --bad-line: #5e2b26;
    --good: #6cc6a6;
    --good-soft: #15281f;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.6 var(--font); }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-hover); }
code, .mono { font-family: var(--mono); font-size: .95em; }
h1, h2, h3 { line-height: 1.3; margin: 0 0 .5em; }
h1 { font-size: 1.45rem; }
h2 { font-size: 1.1rem; }
h3 { font-size: 1rem; margin-top: 1.2em; }
h1 small { font-size: .9rem; font-weight: 500; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* top bar */
.top { background: var(--card); border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.top-in { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; padding-top: 10px; padding-bottom: 10px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; color: var(--fg); text-decoration: none; margin: 0; }
.brand .mark { width: 22px; height: 22px; border-radius: 6px; flex: none;
  background: repeating-linear-gradient(90deg, var(--on-accent) 0 2px, transparent 2px 4px, var(--on-accent) 4px 5px, transparent 5px 7px) 5px 5px / 12px 12px no-repeat, var(--accent); }
.top nav { display: flex; flex-wrap: wrap; gap: 4px; }
.top nav a { padding: 6px 12px; border-radius: 999px; color: var(--muted); text-decoration: none; font-weight: 500; }
.top nav a:hover { color: var(--fg); background: var(--bg); }
.top nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.me { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.me form { margin: 0; }
.who { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border: 1px solid var(--line); border-radius: 999px; font-size: .85rem; color: var(--fg); text-decoration: none; }
.who::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.who small { color: var(--muted); font-size: .78rem; }
.who:hover, .who[aria-current="page"] { border-color: var(--accent); color: var(--fg); }
button.link { font: inherit; font-size: .85rem; background: none; border: 0; padding: 6px 8px; color: var(--muted); cursor: pointer; border-radius: 8px; }
button.link:hover { color: var(--fg); background: var(--bg); }

/* cards */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px 24px; margin: 0 0 16px; }
.card.narrow { max-width: 760px; }
.card.subtle { background: transparent; box-shadow: none; }
.card.alert.bad { border-color: var(--bad-line); background: var(--bad-soft); }
.card.alert.bad h2 { color: var(--bad); }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: .6em; }
.card-head h1, .card-head h2, .card-head .code-big { margin: 0; }
.lede { color: var(--muted); margin: 0 0 18px; max-width: 72ch; }
.eyebrow { color: var(--muted); font-size: .85rem; margin: 0 0 6px; }
.eyebrow a { color: var(--muted); text-decoration: none; }
.eyebrow a:hover { color: var(--fg); }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.nowrap { white-space: nowrap; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.empty { color: var(--muted); padding: 18px 0 6px; margin: 0; }
.count { margin: 10px 0 6px; }

/* messages */
.flash { border-radius: 10px; padding: 10px 14px; margin: 0 0 16px; border: 1px solid var(--line); background: var(--card); }
.flash.ok { border-color: transparent; background: var(--good-soft); color: var(--good); }
.flash.error { border-color: var(--bad-line); background: var(--bad-soft); color: var(--bad); }
.flash.warn { border-color: var(--warn-line); background: var(--warn-soft); color: var(--warn); }
.note { border-radius: 10px; padding: 10px 14px; background: var(--bg); margin: 12px 0; }
.note.warn { background: var(--warn-soft); color: var(--warn); }
.note.warn a { color: inherit; font-weight: 600; }
.tag { display: inline-block; font-size: .78rem; padding: 1px 8px; border-radius: 999px; background: var(--bg); color: var(--muted); border: 1px solid var(--line); white-space: nowrap; }
.tag.good { background: var(--good-soft); color: var(--good); border-color: transparent; }
.tag.warn { background: var(--warn-soft); color: var(--warn); border-color: var(--warn-line); }
.tag.bad { background: var(--bad-soft); color: var(--bad); border-color: var(--bad-line); }

/* just-assigned UPC */
.assigned { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; margin: 0 0 16px; padding: 18px 24px; border-radius: var(--radius); background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.assigned p { margin: 0; }
.code-big { font-family: var(--mono); font-size: clamp(1.6rem, 5vw, 2.2rem); font-weight: 700; letter-spacing: .06em; line-height: 1.25; margin: 4px 0 8px; overflow-wrap: anywhere; }

/* stats */
.stats { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 14px; }
.stat { display: grid; padding: 10px 16px; border-radius: 10px; background: var(--bg); min-width: 120px; }
.stat b { font-size: 1.6rem; line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: .85rem; }
.stat.good { background: var(--good-soft); }
.stat.good b { color: var(--good); }
.stat.warn { background: var(--warn-soft); }
.stat.warn b { color: var(--warn); }
.stat.bad { background: var(--bad-soft); }
.stat.bad b { color: var(--bad); }

/* buttons & fields */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; font: inherit; font-weight: 600; padding: 8px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--fg); cursor: pointer; text-decoration: none; min-height: 40px; white-space: nowrap; }
.btn:hover { border-color: var(--muted); color: var(--fg); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }
.btn.danger { color: var(--bad); border-color: var(--bad-line); }
.btn.danger:hover { background: var(--bad-soft); }
.btn.block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.copied::after, .upc.copied::after { content: " ✓ 已复制"; font-weight: 500; }
:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 2px; }
.form-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 14px; }
.form-row form { margin: 0; }
.fields { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 4px; }
.fields + .fields { margin-top: 12px; }
.fields.column { flex-direction: column; }
.fields.column .field { flex: none; }
.field { display: grid; gap: 4px; font-size: .85rem; color: var(--muted); flex: 1 1 200px; min-width: 0; align-content: start; }
.field.grow { flex: 2 1 280px; }
.field.block { margin-top: 12px; }
.field span { font-weight: 600; color: var(--fg); }
.field small { font-weight: 400; color: var(--muted); }
.field em { font-style: normal; color: var(--bad); }
.field.invalid input, .field.invalid select { border-color: var(--bad); }
input, select, textarea { font: inherit; font-size: 15px; color: var(--fg); background: var(--field); border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; min-height: 40px; width: 100%; }
input[type="file"] { padding: 6px; }
input[type="checkbox"] { width: auto; min-height: 0; }
textarea { font-family: var(--mono); font-size: 14px; line-height: 1.5; resize: vertical; }
.check { display: flex; align-items: center; gap: 8px; margin-top: 12px; font-size: .9rem; color: var(--warn); }
.stack { display: grid; gap: 4px; }

/* tabs & filters */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--line); margin: 6px 0 14px; }
.tabs a { padding: 8px 14px; margin-bottom: -1px; color: var(--muted); text-decoration: none; font-weight: 600; border-bottom: 2px solid transparent; }
.tabs a span { font-weight: 500; font-size: .85rem; color: var(--muted); }
.tabs a:hover { color: var(--fg); }
.tabs a[aria-current="page"] { color: var(--accent); border-bottom-color: var(--accent); }
.filters { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.filters input[type="search"] { flex: 2 1 240px; width: auto; }
.filters select { flex: 1 1 140px; width: auto; }

/* tables */
.table-wrap { overflow-x: auto; margin: 0 -4px; padding: 0 4px; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th { text-align: left; font-weight: 600; font-size: .8rem; color: var(--muted); padding: 8px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; white-space: nowrap; }
td.memo, td.wrap { white-space: normal; min-width: 160px; max-width: 360px; overflow-wrap: anywhere; }
tbody tr:last-child td { border-bottom: 0; }
tr.dim td { color: var(--muted); }
tr.free td { background: color-mix(in srgb, var(--good-soft) 45%, transparent); }
.row-actions { text-align: right; }
button.upc { font: inherit; font-family: var(--mono); font-size: .95em; padding: 2px 6px; margin: -2px -6px; border: 0; border-radius: 6px; background: none; color: var(--fg); cursor: copy; }
button.upc:hover { background: var(--accent-soft); color: var(--accent); }
.pager { display: flex; justify-content: center; align-items: center; gap: 16px; margin-top: 14px; font-size: .9rem; color: var(--muted); }
details.more { margin-top: 14px; }
details.more summary { cursor: pointer; color: var(--muted); }

/* detail pages */
.facts { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin: 4px 0 14px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; overflow-wrap: anywhere; }
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li { padding: 7px 0; border-top: 1px solid var(--line); font-size: .9rem; overflow-wrap: anywhere; }
.timeline li:first-child { border-top: 0; }
.timeline .when { color: var(--muted); font-variant-numeric: tabular-nums; margin-right: 6px; }
.rules dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin: 0; }
.rules dt { font-weight: 600; }
.rules dd { margin: 0; color: var(--muted); }

/* login */
.login { min-height: 80vh; display: grid; place-items: center; }
.login .card { width: 100%; max-width: 380px; padding: 30px 28px; }
.login .brand { font-size: 1.3rem; margin-bottom: 18px; }
.login .btn.block { margin-top: 18px; }
.login .small { margin: 16px 0 0; text-align: center; }

@media (max-width: 640px) {
  body { font-size: 14.5px; }
  .card { padding: 16px; }
  .assigned { padding: 16px; }
  .top nav a { padding: 5px 10px; }
  .me { margin-left: 0; }
  .rules dl, .facts { grid-template-columns: 1fr; }
  .rules dd, .facts dd { margin-bottom: 8px; }
  .facts dt { margin-top: 4px; }
  .stat { flex: 1 1 40%; min-width: 0; }
}