:root {
  --bg: #f5f6f8; --card: #fff; --text: #1d2330; --muted: #6b7385; --line: #e3e6ec;
  --primary: #1f5eff; --danger: #c62828; --warn: #b26a00; --warn-bg: #fff4e0; --late-bg: #fdecec;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #12151b; --card: #1b2029; --text: #e6e9ef; --muted: #98a1b3; --line: #2a303b;
          --primary: #6b93ff; --danger: #ff6b6b; --warn: #ffb74d; --warn-bg: #3a2e17; --late-bg: #3a1f22; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.35rem; margin: 0; } h2 { font-size: 1.1rem; margin-top: 28px; }
a { color: var(--primary); }
.muted { color: var(--muted); } .small { font-size: .85rem; }
.top { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 16px;
       background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; flex-wrap: wrap; }
.top nav { display: flex; gap: 14px; }
.top nav a { text-decoration: none; color: var(--muted); } .top nav a.on { color: var(--text); font-weight: 600; }
.head { display: flex; justify-content: space-between; align-items: center; margin: 4px 0 14px; gap: 8px; }
.tabs { display: flex; gap: 6px; margin-bottom: 14px; overflow-x: auto; }
.tabs a { padding: 8px 12px; border-radius: 8px; background: var(--card); border: 1px solid var(--line);
          text-decoration: none; color: var(--text); white-space: nowrap; }
.tabs a span { color: var(--muted); font-size: .8rem; margin-left: 4px; }
.tabs a.on { border-color: var(--primary); box-shadow: inset 0 -2px 0 var(--primary); }
.tabs a.danger { color: var(--danger); }
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; display: grid; gap: 6px; }
.card.late { background: var(--late-bg); border-color: var(--danger); }
.card.review { border-left: 4px solid var(--warn); }
.row1, .row2 { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: baseline; }
.amount { font-weight: 700; font-size: 1.05rem; }
.tag { font-size: .72rem; padding: 2px 6px; border-radius: 4px; background: var(--bg); border: 1px solid var(--line); }
.tag.warn { background: var(--warn-bg); color: var(--warn); border-color: var(--warn); }
.barcode { display: flex; gap: 8px; align-items: center; }
.barcode code { font-size: .78rem; word-break: break-all; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 4px; }
form.inline { display: inline-flex; gap: 6px; align-items: center; margin: 0; }
.btn { display: inline-block; padding: 8px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--card);
       color: var(--text); text-decoration: none; font: inherit; cursor: pointer; }
.btn.small { padding: 5px 10px; font-size: .85rem; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.danger { color: var(--danger); border-color: var(--danger); }
input, select { font: inherit; padding: 7px 9px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.form { display: grid; gap: 12px; max-width: 480px; margin-top: 14px; }
.form label { display: grid; gap: 4px; font-size: .9rem; color: var(--muted); }
.filter { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }
.notice { background: var(--card); border-left: 4px solid var(--primary); padding: 8px 12px; border-radius: 6px; }
.alert { color: var(--danger); }
.empty { color: var(--muted); padding: 24px 0; text-align: center; }
.login { max-width: 360px; margin: 18vh auto 0; text-align: center; display: grid; gap: 14px; }
.danger-zone { margin-top: 28px; }