:root {
  --bg: #f6f7f9; --card: #fff; --fg: #15171c; --muted: #6b7280; --line: #e5e7eb;
  --accent: #2563eb; --accent-fg: #fff; --danger: #dc2626; --warn: #d97706;
  --soon-bg: #fef2f2; --month-bg: #fffbeb; --ok-bg: #ecfdf5; --ok-fg: #065f46;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --card: #181b21; --fg: #e6e6e6; --muted: #9aa1ac; --line: #2a2f38;
    --accent: #3b82f6; --danger: #f87171; --warn: #fbbf24;
    --soon-bg: #2a1616; --month-bg: #2a2314; --ok-bg: #0f2a20; --ok-fg: #6ee7b7;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding-bottom: calc(90px + env(safe-area-inset-bottom));
}
a { color: var(--accent); text-decoration: none; }
h1 { font-size: 1.35rem; margin: .5rem 0 1rem; }
h2 { font-size: 1.05rem; margin: 1.25rem 0 .5rem; }
h3 { font-size: .95rem; margin: 1rem 0 .4rem; color: var(--muted); font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: .82rem; }

.top {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: .75rem;
  padding: .6rem 16px; padding-top: calc(.6rem + env(safe-area-inset-top));
  background: var(--card); border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; color: var(--fg); margin-right: auto; }
.top nav { display: flex; gap: .15rem; }
.top nav a { padding: .35rem .6rem; border-radius: 8px; color: var(--muted); font-size: .92rem; }
.top nav a.on { background: var(--bg); color: var(--fg); font-weight: 600; }

main { max-width: 720px; margin: 0 auto; padding: 12px 16px; }

.tabs { display: flex; gap: .4rem; overflow-x: auto; margin: .25rem 0 .75rem; }
.tabs a {
  flex: 0 0 auto; padding: .4rem .85rem; border-radius: 999px; border: 1px solid var(--line);
  color: var(--fg); background: var(--card); font-size: .92rem;
}
.tabs a.on { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .6rem; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: .7rem .85rem; display: flex; flex-direction: column; }
.stat strong { font-size: 1.2rem; font-variant-numeric: tabular-nums; }
.stat.total { border-color: var(--accent); }

.row-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }

.list { list-style: none; margin: 0; padding: 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.list li { display: flex; align-items: center; gap: .6rem; padding: .7rem .85rem; border-top: 1px solid var(--line); }
.list li:first-child { border-top: 0; }
.list li.group { background: var(--bg); font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); padding: .45rem .85rem; }
.list li.inactive { opacity: .5; }
.list a.grow { flex: 1; min-width: 0; color: var(--fg); display: flex; flex-direction: column; }
.list a.grow > * { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.amt { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; display: flex; flex-direction: column; align-items: flex-end; }
.alerts .list li.due-soon { background: var(--soon-bg); }
.alerts .list li.due-month { background: var(--month-bg); }
span.due-soon { color: var(--danger); }
span.due-month { color: var(--warn); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem; }
.card h2:first-child { margin-top: 0; }
.big { font-size: 1.5rem; font-weight: 700; margin: .2rem 0; font-variant-numeric: tabular-nums; }

.form label { display: block; margin-bottom: .85rem; font-size: .9rem; font-weight: 500; }
input, select, textarea {
  display: block; width: 100%; margin-top: .3rem; padding: .65rem .7rem; font: inherit; font-size: 16px;
  color: var(--fg); background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
input[type=checkbox], input[type=radio] { display: inline; width: auto; margin: 0 .4rem 0 0; }
.form label.check { display: flex; align-items: center; }
.cols { display: flex; gap: .6rem; }
.cols .grow { flex: 1; min-width: 0; }
.seg { border: 0; padding: 0; margin: 0 0 .85rem; display: flex; gap: .4rem; }
.seg legend { font-size: .9rem; font-weight: 500; margin-bottom: .3rem; }
.seg label { flex: 1; margin: 0; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: block; text-align: center; padding: .6rem; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); }
.seg input:checked + span { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn {
  display: inline-block; padding: .65rem 1rem; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--fg); font: inherit; font-weight: 500; cursor: pointer; text-align: center;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn.danger { color: var(--danger); }
.btn.small { padding: .35rem .7rem; font-size: .85rem; }
.actions { display: flex; gap: .6rem; justify-content: flex-end; flex-wrap: wrap; }
.actions-extra { display: flex; gap: .6rem; justify-content: space-between; flex-wrap: wrap; }
form.inline { margin: 0; }

.fab {
  position: fixed; right: 18px; bottom: calc(18px + env(safe-area-inset-bottom));
  width: 58px; height: 58px; border-radius: 50%; background: var(--accent); color: var(--accent-fg);
  font-size: 2rem; line-height: 56px; text-align: center; box-shadow: 0 6px 18px rgba(0,0,0,.25);
}

.flash { padding: .7rem .85rem; border-radius: 10px; background: var(--ok-bg); color: var(--ok-fg); margin: 0 0 1rem; }
.flash.err { background: var(--soon-bg); color: var(--danger); }
.empty { color: var(--muted); text-align: center; padding: 1.5rem 0; }

.login { max-width: 360px; margin: 18vh auto 0; }
.login h1 { margin: 0; }
.login label { display: block; margin: 1rem 0; font-weight: 500; }
.login .btn { width: 100%; }

.month-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: .75rem; }
.tbl { width: 100%; border-collapse: collapse; font-size: .92rem; }
.tbl td { padding: .45rem 0; border-top: 1px solid var(--line); vertical-align: top; }
.tbl td + td { padding-left: .6rem; }
.tbl tbody tr:first-child td { border-top: 0; }
.tbl tfoot td { font-weight: 700; border-top: 2px solid var(--line); }
.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.bar { height: 4px; background: var(--line); border-radius: 2px; margin-top: .3rem; }
.bar i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 2px; }