:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --fg: #1f2328;
  --muted: #6b7280;
  --border: #e3e6ea;
  --accent: #4f9d69;
  --accent-fg: #ffffff;
  --danger: #c65b5b;
  --warn-bg: #fff4e5;
  --warn-fg: #8a5a00;
  --ok-bg: #eaf6ee;
  --ok-fg: #256b3d;
  --chart-1: #4f9d69;
  --chart-2: #8aa0c0;
  --chart-3: #e0a458;
  --chart-4: #a06fb0;
  --radius: 14px;
  --tabbar-h: 62px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1e2127;
    --fg: #e6e8eb;
    --muted: #9aa1ab;
    --border: #2c313a;
    --accent: #5bb47b;
    --danger: #e07a7a;
    --warn-bg: #3a2f1c;
    --warn-fg: #f0c987;
    --ok-bg: #1e3327;
    --ok-fg: #8fd3a6;
    --chart-2: #8fa6c8;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-text-size-adjust: 100%;
}

.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center;
  padding: 12px 16px; padding-top: calc(12px + env(safe-area-inset-top));
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 18px; }

.content {
  max-width: 760px; margin: 0 auto;
  padding: 14px 14px calc(var(--tabbar-h) + 20px + env(safe-area-inset-bottom));
}
h1 { font-size: 20px; margin: 6px 2px 12px; }
h3 { font-size: 15px; margin: 0 0 10px; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px; margin-bottom: 14px;
}
.muted { color: var(--muted); font-size: 13px; }
.scroll { overflow-x: auto; }

/* forms */
.form .field { margin-bottom: 12px; }
.field label { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--muted); }
.field label > span { font-weight: 500; }
input, select, button, textarea {
  font: inherit; color: var(--fg);
}
input, select {
  width: 100%; padding: 11px 12px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--bg); color: var(--fg);
}
input.mini { width: 110px; }
button {
  cursor: pointer; padding: 11px 14px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--surface); color: var(--fg);
}
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; width: 100%; }
button.danger { color: var(--danger); border-color: var(--danger); }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-row button { flex: 1; min-width: 120px; }

/* totals / stats */
.totals { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 14px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 10px; text-align: center; }
.stat-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.stat-val { font-size: 15px; font-weight: 700; margin-top: 3px; }
@media (max-width: 520px) { .stat-val { font-size: 13px; } .totals { gap: 6px; } .stat { padding: 8px 4px; } }

/* summary table */
table.grid { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 460px; }
table.grid th, table.grid td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); }
table.grid th { color: var(--muted); font-weight: 600; font-size: 12px; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }
td.over { color: var(--warn-fg); }
td.neg { color: var(--danger); }

/* banners */
.banner { border-radius: 12px; padding: 11px 13px; font-size: 13px; margin-bottom: 14px; line-height: 1.4; }
.banner.warn { background: var(--warn-bg); color: var(--warn-fg); }
.banner.ok { background: var(--ok-bg); color: var(--ok-fg); }

/* charts */
.chart { width: 100%; overflow-x: auto; }
.chart .empty { color: var(--muted); font-size: 13px; padding: 20px 0; text-align: center; }

/* transactions */
.txn { display: flex; align-items: center; gap: 10px; padding: 10px 2px; border-bottom: 1px solid var(--border); }
.txn:last-child { border-bottom: none; }
.txn-main { flex: 1; min-width: 0; }
.txn-top { display: flex; align-items: center; gap: 8px; }
.txn-date { color: var(--muted); font-size: 12px; }
.txn-meta { color: var(--muted); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.txn-amt { font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; }
.txn-amt.neg { color: var(--danger); }
.txn-amt.pos { color: var(--accent); }
.kind { font-size: 10px; text-transform: uppercase; letter-spacing: .04em; padding: 2px 6px; border-radius: 6px; background: var(--bg); border: 1px solid var(--border); color: var(--muted); }
.k-expense { color: var(--danger); }
.k-income, .k-refund { color: var(--accent); }
.del { border: none; background: transparent; color: var(--muted); font-size: 15px; padding: 6px 8px; }
.search { margin-bottom: 8px; }

/* settings */
.cat-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 9px 0; border-bottom: 1px solid var(--border); }
.cat-name { font-weight: 600; min-width: 96px; }
.inline { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }
.inline input.mini, .inline select { width: auto; padding: 6px 8px; }
.inline input[type=checkbox] { width: 18px; height: 18px; }

.row-between { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.month-picker { width: auto; }

/* drive setup steps */
.steps { margin: 10px 0 0; padding-left: 20px; font-size: 13px; color: var(--muted); line-height: 1.6; }
.steps code, code { background: var(--bg); border: 1px solid var(--border); border-radius: 5px; padding: 1px 5px; font-size: 12px; word-break: break-all; }
details summary { cursor: pointer; padding: 6px 0; }

/* tab bar */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 10;
  display: grid; grid-template-columns: repeat(5, 1fr);
  background: var(--surface); border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar button {
  border: none; background: transparent; border-radius: 0;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  font-size: 18px; padding: 9px 0 8px; color: var(--muted);
}
.tabbar button span { font-size: 10px; }
.tabbar button.active { color: var(--accent); }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--tabbar-h) + 16px + env(safe-area-inset-bottom));
  transform: translate(-50%, 12px); opacity: 0; transition: .25s;
  background: var(--fg); color: var(--bg); padding: 9px 16px; border-radius: 20px;
  font-size: 13px; z-index: 50; pointer-events: none; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }