:root {
  --fg: #1d2126;
  --muted: #6b7480;
  --bg: #fafbfc;
  --card-bg: #ffffff;
  --border: #e3e6ea;
  --accent: #2563eb;
  --owed: #b45309;
  --clear: #047857;
  --error-bg: #fee2e2;
  --error-fg: #991b1b;
  --ok-bg: #d1fae5;
  --ok-fg: #065f46;
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
  line-height: 1.5;
}
header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 10;
}
nav { display: flex; gap: 1.25rem; align-items: center; }
nav a {
  color: var(--fg);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}
nav a:hover { background: #f1f5f9; }
nav a.brand { font-weight: 600; color: var(--accent); }
nav a.chesed-link {
  background: #f3e8ff;
  color: #6b21a8;
  border: 1px solid #d8b4fe;
}
nav a.chesed-link:hover { background: #e9d5ff; }

/* Per-card tab strip below the main nav. */
nav.cards-nav {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  gap: 0.25rem;
  flex-wrap: wrap;
}
nav.cards-nav a.card-tab {
  display: inline-flex;
  flex-direction: column;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  text-decoration: none;
  color: var(--fg);
  line-height: 1.15;
}
nav.cards-nav a.card-tab:hover { border-color: var(--accent); background: #f1f5f9; }
nav.cards-nav a.card-tab.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}
nav.cards-nav .card-last4 { font-weight: 600; font-size: 0.85rem; }
nav.cards-nav .card-holder { font-size: 0.7rem; color: var(--muted); }
nav.cards-nav a.card-tab.active .card-holder { color: #cbd9ff; }
main { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }
h1 { font-size: 1.5rem; margin: 0 0 1rem; }
h2 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }
.muted { color: var(--muted); font-weight: normal; }
.amount { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

table {
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  border-collapse: collapse;
  overflow: hidden;
  margin-bottom: 1rem;
}
th, td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
th { background: #f6f8fa; font-weight: 600; color: var(--muted); font-size: 0.85rem; }
tr:last-child td { border-bottom: 0; }
tr.muted td { color: var(--muted); }

.cards { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.card {
  flex: 1 1 150px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
}
.card .label { color: var(--muted); font-size: 0.85rem; }
.card .value { font-size: 1.5rem; font-weight: 600; }

.balance {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}
.balance-amount { font-size: 1.75rem; font-weight: 600; }
.balance-amount.owed { color: var(--owed); }
.balance-amount.clear { color: var(--clear); }

.flashes { padding: 0 1.5rem; }
.flash { padding: 0.5rem 0.75rem; border-radius: 4px; margin-top: 0.5rem; }
.flash.ok { background: var(--ok-bg); color: var(--ok-fg); }
.flash.error { background: var(--error-bg); color: var(--error-fg); }

.row-form, .stack-form, .filter-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: end;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.stack-form { flex-direction: column; align-items: stretch; max-width: 480px; }
.row-form label, .stack-form label, .filter-bar label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  color: var(--muted);
  gap: 0.25rem;
}
.filter-bar label.checkbox { flex-direction: row; align-items: center; gap: 0.4rem; }
input, select, textarea {
  font: inherit;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  color: var(--fg);
}
button {
  font: inherit;
  padding: 0.45rem 1rem;
  background: var(--accent);
  color: white;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
}
button:hover { background: #1d4ed8; }
.hint { font-size: 0.8rem; color: var(--muted); }

dl.meta { display: grid; grid-template-columns: 8rem 1fr; gap: 0.25rem 1rem; margin-bottom: 1.5rem; }
dl.meta dt { color: var(--muted); }

details summary { cursor: pointer; padding: 0.5rem 0; color: var(--accent); }
.pager { display: flex; gap: 1rem; align-items: center; }
.pager span { color: var(--muted); }