:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #6b7280;
  --line: #d9dde3;
  --accent: #2563eb;
  --danger: #b91c1c;
  --ok: #15803d;
  --radius: 8px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111418; --card: #1a1f27; --text: #e6e9ef; --muted: #98a2b3; --line: #2d3440;
  }
}
:root[data-theme="dark"] {
  --bg: #111418; --card: #1a1f27; --text: #e6e9ef; --muted: #98a2b3; --line: #2d3440;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: "Yu Gothic UI", "Meiryo", sans-serif; font-size: 14px; }
header.top { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line); }
header.top h1 { font-size: 16px; margin: 0 16px 0 0; }
nav a { color: var(--accent); text-decoration: none; margin-right: 12px; }
nav a.active { font-weight: bold; text-decoration: underline; }
.nav-user { color: var(--muted); margin: 0 12px; }
main { padding: 16px; max-width: 1400px; margin: 0 auto; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; }
.card h2 { font-size: 15px; margin: 0 0 12px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.toolbar input[type="search"] { flex: 1; min-width: 200px; }
input, select, textarea { font: inherit; color: inherit; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; }
input:disabled, select:disabled { opacity: .6; }
button, .btn { font: inherit; padding: 7px 14px; border-radius: 6px; border: 1px solid var(--accent); background: var(--accent); color: #fff; cursor: pointer; text-decoration: none; display: inline-block; }
button.secondary { background: transparent; color: var(--accent); }
button.danger { background: var(--danger); border-color: var(--danger); }
button:disabled { opacity: .5; cursor: default; }
.link-btn { background: none; border: none; color: var(--accent); padding: 0; cursor: pointer; font: inherit; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--line); padding: 6px 8px; text-align: left; white-space: nowrap; }
th { background: var(--bg); font-weight: 600; position: sticky; top: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.table-wrap { overflow-x: auto; max-height: 70vh; }
tr.total td { font-weight: bold; border-top: 2px solid var(--line); }
.profit-neg { color: var(--danger); }
.profit-pos { color: var(--ok); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.grid label { display: flex; flex-direction: column; gap: 4px; color: var(--muted); font-size: 12px; }
.grid label input, .grid label select { color: var(--text); }
.summary { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; }
.summary div { background: var(--bg); border-radius: 6px; padding: 8px 10px; }
.summary span { display: block; color: var(--muted); font-size: 12px; }
.summary strong { font-size: 16px; font-variant-numeric: tabular-nums; }
.message { padding: 10px 12px; border-radius: 6px; margin-bottom: 12px; }
.message.ok { background: #dcfce7; color: #14532d; }
.message.error { background: #fee2e2; color: #7f1d1d; }
[hidden] { display: none !important; }
.login-box { max-width: 360px; margin: 80px auto; }
.login-box label { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; color: var(--muted); }
.login-box input { color: var(--text); }
@media (max-width: 640px) {
  main { padding: 10px; }
  th, td { padding: 5px 6px; font-size: 13px; }
}