:root {
  --bg: #f4f7fb;
  --ink: #0f172a;
  --muted: #64748b;
  --card: #fff;
  --line: #dbe3ee;
  --pri: #0369a1;
  --pri-ink: #fff;
  --due: #e2e8f0;
  --mr: #dbeafe;
  --sign: #d1fae5;
  --po: #fde68a;
  --ship: #fed7aa;
  --ret: #e9d5ff;
  --gr: #bbf7d0;
  --over: #fecaca;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 14px/1.45 "Segoe UI", "Microsoft JhengHei", sans-serif; }
a { color: var(--pri); }
header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 18px; background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5;
}
header h1 { margin: 0; font-size: 18px; }
.meta { color: var(--muted); font-size: 12px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
input, select, button, textarea {
  font: inherit; border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; background: #fff;
}
button { background: var(--pri); color: var(--pri-ink); border-color: var(--pri); cursor: pointer; }
button.ghost { background: #fff; color: var(--ink); }
button:disabled { opacity: .5; cursor: not-allowed; }
.tabs { display: flex; gap: 6px; padding: 10px 18px 0; }
.tabs button { background: #fff; color: var(--ink); }
.tabs button.on { background: var(--pri); color: #fff; }
main { padding: 12px 18px 40px; }
.board { display: grid; grid-template-columns: repeat(7, minmax(200px, 1fr)); gap: 10px; overflow-x: auto; }
.col { background: #eef3f8; border-radius: 12px; padding: 8px; min-height: 60vh; }
.col h3 { margin: 0 0 8px; font-size: 13px; display: flex; justify-content: space-between; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 8px; margin-bottom: 8px; cursor: pointer;
}
.card.overdue { background: var(--over); }
.card small { color: var(--muted); display: block; }
.card .pn { font-weight: 650; }
.login { max-width: 360px; margin: 12vh auto; background: #fff; padding: 24px; border-radius: 16px; border: 1px solid var(--line); }
.login h1 { margin-top: 0; }
.login form { display: grid; gap: 10px; }
.panel { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin-bottom: 12px; }
.hidden { display: none; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
dialog { border: 1px solid var(--line); border-radius: 14px; width: min(720px, 96vw); padding: 0; }
dialog header { position: static; }
.dlg { padding: 14px 16px; }
.fields { display: grid; grid-template-columns: 140px 1fr; gap: 6px 10px; }
pre { white-space: pre-wrap; background: #0f172a; color: #e2e8f0; padding: 10px; border-radius: 8px; font-size: 12px; }
.toast { position: fixed; bottom: 16px; right: 16px; background: #0f172a; color: #fff; padding: 8px 12px; border-radius: 8px; display: none; }
.err { color: #b91c1c; }