:root {
  --bg: #f6f7f5; --card: #fff; --text: #1d2a26; --muted: #66756f; --line: #e1e6e3;
  --accent: #1f6f5c; --accent-text: #fff; --danger: #b3261e; --up: #b3261e; --down: #1f6f5c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121715; --card: #1b2220; --text: #e6ece9; --muted: #93a39c; --line: #2b3532;
    --accent: #4fb89c; --accent-text: #08201a; --danger: #f2b8b5; --up: #f2b8b5; --down: #6fd1b6;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.4 system-ui, sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 16px 16px 88px; }
h1 { font-size: 1.25rem; margin: 0 0 12px; }
a { color: inherit; text-decoration: none; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin-bottom: 12px; }
.month-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.month-nav button { font-size: 1.4rem; padding: 4px 14px; }
.month-nav .label { font-weight: 600; text-transform: capitalize; }
.total { font-size: 2rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.diff { color: var(--muted); font-size: .9rem; }
.diff.up { color: var(--up); } .diff.down { color: var(--down); }
.row { display: flex; justify-content: space-between; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); }
.row:first-child { border-top: 0; }
.row .amount { font-variant-numeric: tabular-nums; white-space: nowrap; }
.row small { display: block; color: var(--muted); }
.empty { color: var(--muted); text-align: center; padding: 24px 0; }
button, .btn { font: inherit; border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 10px; padding: 10px 14px; cursor: pointer; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); width: 100%; font-weight: 600; }
button.danger { color: var(--danger); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 14px; }
.chip { border-radius: 999px; padding: 8px 14px; }
.chip.selected { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
label { display: block; font-size: .85rem; color: var(--muted); margin-top: 12px; }
input, select { width: 100%; font: inherit; padding: 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--text); }
input.amount-input { font-size: 1.6rem; font-weight: 600; }
.error { color: var(--danger); margin-top: 8px; }
.actions { display: flex; gap: 8px; margin-top: 16px; } .actions > * { flex: 1; }
.back { display: inline-block; margin-bottom: 8px; color: var(--muted); }
.bottom-nav { position: fixed; bottom: 0; left: 0; right: 0; display: flex; justify-content: center; gap: 12px; padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); background: var(--card); border-top: 1px solid var(--line); }
.bottom-nav a { flex: 1; max-width: 200px; text-align: center; padding: 10px; border-radius: 10px; border: 1px solid var(--line); }
.bottom-nav a.add { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
h2 { font-size: 1.05rem; margin: 0 0 4px; }
.hint { color: var(--muted); font-size: .9rem; margin: 0 0 10px; }
.status { color: var(--muted); margin: 10px 0 0; min-height: 1.4em; }
.btn { display: block; text-align: center; }
.row select { max-width: 55%; font: inherit; padding: 8px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
input[type="file"] { padding: 8px; }
body.signed-out .bottom-nav { display: none; }
body.signed-out main { padding-bottom: 16px; }