:root {
  --bg: #f6f7f9;
  --fg: #1f2933;
  --muted: #7b8794;
  --line: #e1e6eb;
  --accent: #2f6f4f;
  --accent-weak: #e7f1ec;
  --danger: #b4453a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--fg);
  background: var(--bg);
  font-size: 14px;
}
header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 12px 20px;
}
h1 { font-size: 18px; margin: 0 0 8px; }
h2 { font-size: 16px; margin: 0 0 12px; }
.muted { color: var(--muted); font-size: 12px; font-weight: normal; }
nav#tabs { display: flex; gap: 4px; }
nav#tabs button {
  border: none; background: none; padding: 8px 14px; cursor: pointer;
  border-radius: 6px; color: var(--muted); font-size: 14px;
}
nav#tabs button.active { background: var(--accent-weak); color: var(--accent); font-weight: 600; }
main { padding: 20px; max-width: 980px; margin: 0 auto; }
.tab { display: none; background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
.tab.active { display: block; }
.row { display: flex; gap: 12px; align-items: flex-end; margin-bottom: 12px; flex-wrap: wrap; }
.row .grow { flex: 1; }
.row .spacer { flex: 1; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
input, select {
  font: inherit; padding: 7px 9px; border: 1px solid var(--line); border-radius: 6px;
  background: #fff; color: var(--fg);
}
input[type="date"] { min-width: 150px; }
button { font: inherit; cursor: pointer; border-radius: 6px; padding: 8px 16px; border: 1px solid var(--line); background: #fff; }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.ghost { background: #fff; }
button.link { border: none; background: none; color: var(--accent); padding: 2px 6px; }
button.del { border: none; background: none; color: var(--danger); padding: 2px 6px; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th.num, td.num { text-align: right; font-variant-numeric: tabular-nums; }
table.lines td input, table.lines td select { width: 100%; }
.balance { font-weight: 600; }
.balance.ok { color: var(--accent); }
.balance.ng { color: var(--danger); }
.msg { min-height: 18px; }
.msg.ok { color: var(--accent); }
.msg.ng { color: var(--danger); }
.card { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; }
.card .head { display: flex; gap: 10px; align-items: baseline; }
.card .no { color: var(--muted); font-size: 12px; }
.card .date { font-weight: 600; }
.card .desc { color: var(--fg); }
.card .actions { margin-left: auto; }
.mini { width: 100%; font-size: 13px; margin-top: 6px; }
.mini td { padding: 3px 8px; border: none; }
tfoot td { font-weight: 600; border-top: 2px solid var(--fg); }
tr.subtotal td { font-weight: 600; background: var(--accent-weak); }
#auth-overlay { position: fixed; inset: 0; background: var(--bg); display: flex; align-items: center; justify-content: center; z-index: 100; }
.auth-card { background: #fff; padding: 28px; border-radius: 12px; box-shadow: 0 4px 24px rgba(0,0,0,.08); width: 320px; display: flex; flex-direction: column; gap: 10px; }
.auth-card h1 { margin: 0; }
.auth-card input { width: 100%; }
.auth-toggle { font-size: 13px; color: var(--muted); margin: 4px 0 0; }
.auth-toggle a { color: var(--accent); }
#me a { color: var(--accent); }
td.section { font-weight: 600; color: var(--muted); padding-top: 10px; }